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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / net / l2tp / l2tp_netlink.c
blob83956c9ee1fcc7b17ed33239d6c8df53ba4598fd
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* L2TP netlink layer, for management
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
6 * Partly based on the IrDA nelink implementation
7 * (see net/irda/irnetlink.c) which is:
8 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
9 * which is in turn partly based on the wireless netlink code:
10 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <net/sock.h>
16 #include <net/genetlink.h>
17 #include <net/udp.h>
18 #include <linux/in.h>
19 #include <linux/udp.h>
20 #include <linux/socket.h>
21 #include <linux/module.h>
22 #include <linux/list.h>
23 #include <net/net_namespace.h>
24
25 #include <linux/l2tp.h>
26
27 #include "l2tp_core.h"
28
29 static struct genl_family l2tp_nl_family;
30
31 static const struct genl_multicast_group l2tp_multicast_group[] = {
32 {
33 .name = L2TP_GENL_MCGROUP,
34 },
35 };
36
37 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
38 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
39 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
40 int flags, struct l2tp_session *session,
41 u8 cmd);
42
43 /* Accessed under genl lock */
44 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
45
46 static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info)
47 {
48 u32 tunnel_id;
49 u32 session_id;
50 char *ifname;
51 struct l2tp_tunnel *tunnel;
52 struct l2tp_session *session = NULL;
53 struct net *net = genl_info_net(info);
54
55 if (info->attrs[L2TP_ATTR_IFNAME]) {
56 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
57 session = l2tp_session_get_by_ifname(net, ifname);
58 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
59 (info->attrs[L2TP_ATTR_CONN_ID])) {
60 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
61 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
62 tunnel = l2tp_tunnel_get(net, tunnel_id);
63 if (tunnel) {
64 session = l2tp_tunnel_get_session(tunnel, session_id);
65 l2tp_tunnel_dec_refcount(tunnel);
66 }
67 }
68
69 return session;
70 }
71
72 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
73 {
74 struct sk_buff *msg;
75 void *hdr;
76 int ret = -ENOBUFS;
77
78 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
79 if (!msg) {
80 ret = -ENOMEM;
81 goto out;
82 }
83
84 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
85 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
86 if (!hdr) {
87 ret = -EMSGSIZE;
88 goto err_out;
89 }
90
91 genlmsg_end(msg, hdr);
92
93 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
94
95 err_out:
96 nlmsg_free(msg);
97
98 out:
99 return ret;
100 }
101
102 static int l2tp_tunnel_notify(struct genl_family *family,
103 struct genl_info *info,
104 struct l2tp_tunnel *tunnel,
105 u8 cmd)
106 {
107 struct sk_buff *msg;
108 int ret;
109
110 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
111 if (!msg)
112 return -ENOMEM;
113
114 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
115 NLM_F_ACK, tunnel, cmd);
116
117 if (ret >= 0) {
118 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
119 /* We don't care if no one is listening */
120 if (ret == -ESRCH)
121 ret = 0;
122 return ret;
123 }
124
125 nlmsg_free(msg);
126
127 return ret;
128 }
129
130 static int l2tp_session_notify(struct genl_family *family,
131 struct genl_info *info,
132 struct l2tp_session *session,
133 u8 cmd)
134 {
135 struct sk_buff *msg;
136 int ret;
137
138 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
139 if (!msg)
140 return -ENOMEM;
141
142 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
143 NLM_F_ACK, session, cmd);
144
145 if (ret >= 0) {
146 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
147 /* We don't care if no one is listening */
148 if (ret == -ESRCH)
149 ret = 0;
150 return ret;
151 }
152
153 nlmsg_free(msg);
154
155 return ret;
156 }
157
158 static int l2tp_nl_cmd_tunnel_create_get_addr(struct nlattr **attrs, struct l2tp_tunnel_cfg *cfg)
159 {
160 if (attrs[L2TP_ATTR_UDP_SPORT])
161 cfg->local_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_SPORT]);
162 if (attrs[L2TP_ATTR_UDP_DPORT])
163 cfg->peer_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_DPORT]);
164 cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
165
166 /* Must have either AF_INET or AF_INET6 address for source and destination */
167 #if IS_ENABLED(CONFIG_IPV6)
168 if (attrs[L2TP_ATTR_IP6_SADDR] && attrs[L2TP_ATTR_IP6_DADDR]) {
169 cfg->local_ip6 = nla_data(attrs[L2TP_ATTR_IP6_SADDR]);
170 cfg->peer_ip6 = nla_data(attrs[L2TP_ATTR_IP6_DADDR]);
171 cfg->udp6_zero_tx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
172 cfg->udp6_zero_rx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
173 return 0;
174 }
175 #endif
176 if (attrs[L2TP_ATTR_IP_SADDR] && attrs[L2TP_ATTR_IP_DADDR]) {
177 cfg->local_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_SADDR]);
178 cfg->peer_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_DADDR]);
179 return 0;
180 }
181 return -EINVAL;
182 }
183
184 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
185 {
186 u32 tunnel_id;
187 u32 peer_tunnel_id;
188 int proto_version;
189 int fd = -1;
190 int ret = 0;
191 struct l2tp_tunnel_cfg cfg = { 0, };
192 struct l2tp_tunnel *tunnel;
193 struct net *net = genl_info_net(info);
194 struct nlattr **attrs = info->attrs;
195
196 if (!attrs[L2TP_ATTR_CONN_ID]) {
197 ret = -EINVAL;
198 goto out;
199 }
200 tunnel_id = nla_get_u32(attrs[L2TP_ATTR_CONN_ID]);
201
202 if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
203 ret = -EINVAL;
204 goto out;
205 }
206 peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
207
208 if (!attrs[L2TP_ATTR_PROTO_VERSION]) {
209 ret = -EINVAL;
210 goto out;
211 }
212 proto_version = nla_get_u8(attrs[L2TP_ATTR_PROTO_VERSION]);
213
214 if (!attrs[L2TP_ATTR_ENCAP_TYPE]) {
215 ret = -EINVAL;
216 goto out;
217 }
218 cfg.encap = nla_get_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
219
220 /* Managed tunnels take the tunnel socket from userspace.
221 * Unmanaged tunnels must call out the source and destination addresses
222 * for the kernel to create the tunnel socket itself.
223 */
224 if (attrs[L2TP_ATTR_FD]) {
225 fd = nla_get_u32(attrs[L2TP_ATTR_FD]);
226 } else {
227 ret = l2tp_nl_cmd_tunnel_create_get_addr(attrs, &cfg);
228 if (ret < 0)
229 goto out;
230 }
231
232 ret = -EINVAL;
233 switch (cfg.encap) {
234 case L2TP_ENCAPTYPE_UDP:
235 case L2TP_ENCAPTYPE_IP:
236 ret = l2tp_tunnel_create(fd, proto_version, tunnel_id,
237 peer_tunnel_id, &cfg, &tunnel);
238 break;
239 }
240
241 if (ret < 0)
242 goto out;
243
244 l2tp_tunnel_inc_refcount(tunnel);
245 ret = l2tp_tunnel_register(tunnel, net, &cfg);
246 if (ret < 0) {
247 kfree(tunnel);
248 goto out;
249 }
250 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
251 L2TP_CMD_TUNNEL_CREATE);
252 l2tp_tunnel_dec_refcount(tunnel);
253
254 out:
255 return ret;
256 }
257
258 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
259 {
260 struct l2tp_tunnel *tunnel;
261 u32 tunnel_id;
262 int ret = 0;
263 struct net *net = genl_info_net(info);
264
265 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
266 ret = -EINVAL;
267 goto out;
268 }
269 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
270
271 tunnel = l2tp_tunnel_get(net, tunnel_id);
272 if (!tunnel) {
273 ret = -ENODEV;
274 goto out;
275 }
276
277 l2tp_tunnel_notify(&l2tp_nl_family, info,
278 tunnel, L2TP_CMD_TUNNEL_DELETE);
279
280 l2tp_tunnel_delete(tunnel);
281
282 l2tp_tunnel_dec_refcount(tunnel);
283
284 out:
285 return ret;
286 }
287
288 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
289 {
290 struct l2tp_tunnel *tunnel;
291 u32 tunnel_id;
292 int ret = 0;
293 struct net *net = genl_info_net(info);
294
295 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
296 ret = -EINVAL;
297 goto out;
298 }
299 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
300
301 tunnel = l2tp_tunnel_get(net, tunnel_id);
302 if (!tunnel) {
303 ret = -ENODEV;
304 goto out;
305 }
306
307 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
308 tunnel, L2TP_CMD_TUNNEL_MODIFY);
309
310 l2tp_tunnel_dec_refcount(tunnel);
311
312 out:
313 return ret;
314 }
315
316 #if IS_ENABLED(CONFIG_IPV6)
317 static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
318 enum l2tp_encap_type encap)
319 {
320 struct inet_sock *inet = inet_sk(sk);
321 struct ipv6_pinfo *np = inet6_sk(sk);
322
323 switch (encap) {
324 case L2TP_ENCAPTYPE_UDP:
325 if (udp_get_no_check6_tx(sk) &&
326 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
327 return -1;
328 if (udp_get_no_check6_rx(sk) &&
329 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
330 return -1;
331 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
332 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
333 return -1;
334 fallthrough;
335 case L2TP_ENCAPTYPE_IP:
336 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
337 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr))
338 return -1;
339 break;
340 }
341 return 0;
342 }
343 #endif
344
345 static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
346 enum l2tp_encap_type encap)
347 {
348 struct inet_sock *inet = inet_sk(sk);
349
350 switch (encap) {
351 case L2TP_ENCAPTYPE_UDP:
352 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
353 nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
354 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
355 return -1;
356 fallthrough;
357 case L2TP_ENCAPTYPE_IP:
358 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
359 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
360 return -1;
361 break;
362 }
363
364 return 0;
365 }
366
367 /* Append attributes for the tunnel address, handling the different attribute types
368 * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
369 */
370 static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel *tunnel)
371 {
372 struct sock *sk = tunnel->sock;
373
374 if (!sk)
375 return 0;
376
377 #if IS_ENABLED(CONFIG_IPV6)
378 if (sk->sk_family == AF_INET6)
379 return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
380 #endif
381 return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
382 }
383
384 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
385 struct l2tp_tunnel *tunnel, u8 cmd)
386 {
387 void *hdr;
388 struct nlattr *nest;
389
390 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
391 if (!hdr)
392 return -EMSGSIZE;
393
394 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
395 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
396 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
397 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
398 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
399 goto nla_put_failure;
400
401 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
402 if (!nest)
403 goto nla_put_failure;
404
405 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
406 atomic_long_read(&tunnel->stats.tx_packets),
407 L2TP_ATTR_STATS_PAD) ||
408 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
409 atomic_long_read(&tunnel->stats.tx_bytes),
410 L2TP_ATTR_STATS_PAD) ||
411 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
412 atomic_long_read(&tunnel->stats.tx_errors),
413 L2TP_ATTR_STATS_PAD) ||
414 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
415 atomic_long_read(&tunnel->stats.rx_packets),
416 L2TP_ATTR_STATS_PAD) ||
417 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
418 atomic_long_read(&tunnel->stats.rx_bytes),
419 L2TP_ATTR_STATS_PAD) ||
420 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
421 atomic_long_read(&tunnel->stats.rx_seq_discards),
422 L2TP_ATTR_STATS_PAD) ||
423 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
424 atomic_long_read(&tunnel->stats.rx_cookie_discards),
425 L2TP_ATTR_STATS_PAD) ||
426 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
427 atomic_long_read(&tunnel->stats.rx_oos_packets),
428 L2TP_ATTR_STATS_PAD) ||
429 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
430 atomic_long_read(&tunnel->stats.rx_errors),
431 L2TP_ATTR_STATS_PAD))
432 goto nla_put_failure;
433 nla_nest_end(skb, nest);
434
435 if (l2tp_nl_tunnel_send_addr(skb, tunnel))
436 goto nla_put_failure;
437
438 genlmsg_end(skb, hdr);
439 return 0;
440
441 nla_put_failure:
442 genlmsg_cancel(skb, hdr);
443 return -1;
444 }
445
446 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
447 {
448 struct l2tp_tunnel *tunnel;
449 struct sk_buff *msg;
450 u32 tunnel_id;
451 int ret = -ENOBUFS;
452 struct net *net = genl_info_net(info);
453
454 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
455 ret = -EINVAL;
456 goto err;
457 }
458
459 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
460
461 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
462 if (!msg) {
463 ret = -ENOMEM;
464 goto err;
465 }
466
467 tunnel = l2tp_tunnel_get(net, tunnel_id);
468 if (!tunnel) {
469 ret = -ENODEV;
470 goto err_nlmsg;
471 }
472
473 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
474 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
475 if (ret < 0)
476 goto err_nlmsg_tunnel;
477
478 l2tp_tunnel_dec_refcount(tunnel);
479
480 return genlmsg_unicast(net, msg, info->snd_portid);
481
482 err_nlmsg_tunnel:
483 l2tp_tunnel_dec_refcount(tunnel);
484 err_nlmsg:
485 nlmsg_free(msg);
486 err:
487 return ret;
488 }
489
490 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
491 {
492 int ti = cb->args[0];
493 struct l2tp_tunnel *tunnel;
494 struct net *net = sock_net(skb->sk);
495
496 for (;;) {
497 tunnel = l2tp_tunnel_get_nth(net, ti);
498 if (!tunnel)
499 goto out;
500
501 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
502 cb->nlh->nlmsg_seq, NLM_F_MULTI,
503 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
504 l2tp_tunnel_dec_refcount(tunnel);
505 goto out;
506 }
507 l2tp_tunnel_dec_refcount(tunnel);
508
509 ti++;
510 }
511
512 out:
513 cb->args[0] = ti;
514
515 return skb->len;
516 }
517
518 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
519 {
520 u32 tunnel_id = 0;
521 u32 session_id;
522 u32 peer_session_id;
523 int ret = 0;
524 struct l2tp_tunnel *tunnel;
525 struct l2tp_session *session;
526 struct l2tp_session_cfg cfg = { 0, };
527 struct net *net = genl_info_net(info);
528
529 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
530 ret = -EINVAL;
531 goto out;
532 }
533
534 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
535 tunnel = l2tp_tunnel_get(net, tunnel_id);
536 if (!tunnel) {
537 ret = -ENODEV;
538 goto out;
539 }
540
541 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
542 ret = -EINVAL;
543 goto out_tunnel;
544 }
545 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
546
547 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
548 ret = -EINVAL;
549 goto out_tunnel;
550 }
551 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
552
553 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
554 ret = -EINVAL;
555 goto out_tunnel;
556 }
557 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
558 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
559 ret = -EINVAL;
560 goto out_tunnel;
561 }
562
563 /* L2TPv2 only accepts PPP pseudo-wires */
564 if (tunnel->version == 2 && cfg.pw_type != L2TP_PWTYPE_PPP) {
565 ret = -EPROTONOSUPPORT;
566 goto out_tunnel;
567 }
568
569 if (tunnel->version > 2) {
570 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
571 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
572 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
573 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
574 ret = -EINVAL;
575 goto out_tunnel;
576 }
577 } else {
578 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
579 }
580
581 if (info->attrs[L2TP_ATTR_COOKIE]) {
582 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
583
584 if (len > 8) {
585 ret = -EINVAL;
586 goto out_tunnel;
587 }
588 cfg.cookie_len = len;
589 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
590 }
591 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
592 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
593
594 if (len > 8) {
595 ret = -EINVAL;
596 goto out_tunnel;
597 }
598 cfg.peer_cookie_len = len;
599 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
600 }
601 if (info->attrs[L2TP_ATTR_IFNAME])
602 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
603 }
604
605 if (info->attrs[L2TP_ATTR_RECV_SEQ])
606 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
607
608 if (info->attrs[L2TP_ATTR_SEND_SEQ])
609 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
610
611 if (info->attrs[L2TP_ATTR_LNS_MODE])
612 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
613
614 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
615 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
616
617 #ifdef CONFIG_MODULES
618 if (!l2tp_nl_cmd_ops[cfg.pw_type]) {
619 genl_unlock();
620 request_module("net-l2tp-type-%u", cfg.pw_type);
621 genl_lock();
622 }
623 #endif
624 if (!l2tp_nl_cmd_ops[cfg.pw_type] || !l2tp_nl_cmd_ops[cfg.pw_type]->session_create) {
625 ret = -EPROTONOSUPPORT;
626 goto out_tunnel;
627 }
628
629 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
630 session_id,
631 peer_session_id,
632 &cfg);
633
634 if (ret >= 0) {
635 session = l2tp_tunnel_get_session(tunnel, session_id);
636 if (session) {
637 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
638 L2TP_CMD_SESSION_CREATE);
639 l2tp_session_dec_refcount(session);
640 }
641 }
642
643 out_tunnel:
644 l2tp_tunnel_dec_refcount(tunnel);
645 out:
646 return ret;
647 }
648
649 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
650 {
651 int ret = 0;
652 struct l2tp_session *session;
653 u16 pw_type;
654
655 session = l2tp_nl_session_get(info);
656 if (!session) {
657 ret = -ENODEV;
658 goto out;
659 }
660
661 l2tp_session_notify(&l2tp_nl_family, info,
662 session, L2TP_CMD_SESSION_DELETE);
663
664 pw_type = session->pwtype;
665 if (pw_type < __L2TP_PWTYPE_MAX)
666 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
667 l2tp_nl_cmd_ops[pw_type]->session_delete(session);
668
669 l2tp_session_dec_refcount(session);
670
671 out:
672 return ret;
673 }
674
675 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
676 {
677 int ret = 0;
678 struct l2tp_session *session;
679
680 session = l2tp_nl_session_get(info);
681 if (!session) {
682 ret = -ENODEV;
683 goto out;
684 }
685
686 if (info->attrs[L2TP_ATTR_RECV_SEQ])
687 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
688
689 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
690 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
691 l2tp_session_set_header_len(session, session->tunnel->version);
692 }
693
694 if (info->attrs[L2TP_ATTR_LNS_MODE])
695 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
696
697 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
698 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
699
700 ret = l2tp_session_notify(&l2tp_nl_family, info,
701 session, L2TP_CMD_SESSION_MODIFY);
702
703 l2tp_session_dec_refcount(session);
704
705 out:
706 return ret;
707 }
708
709 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
710 struct l2tp_session *session, u8 cmd)
711 {
712 void *hdr;
713 struct nlattr *nest;
714 struct l2tp_tunnel *tunnel = session->tunnel;
715
716 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
717 if (!hdr)
718 return -EMSGSIZE;
719
720 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
721 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
722 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
723 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) ||
724 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
725 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype))
726 goto nla_put_failure;
727
728 if ((session->ifname[0] &&
729 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
730 (session->cookie_len &&
731 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, session->cookie)) ||
732 (session->peer_cookie_len &&
733 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, session->peer_cookie)) ||
734 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
735 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
736 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
737 (l2tp_tunnel_uses_xfrm(tunnel) &&
738 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
739 (session->reorder_timeout &&
740 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
741 session->reorder_timeout, L2TP_ATTR_PAD)))
742 goto nla_put_failure;
743
744 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
745 if (!nest)
746 goto nla_put_failure;
747
748 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
749 atomic_long_read(&session->stats.tx_packets),
750 L2TP_ATTR_STATS_PAD) ||
751 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
752 atomic_long_read(&session->stats.tx_bytes),
753 L2TP_ATTR_STATS_PAD) ||
754 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
755 atomic_long_read(&session->stats.tx_errors),
756 L2TP_ATTR_STATS_PAD) ||
757 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
758 atomic_long_read(&session->stats.rx_packets),
759 L2TP_ATTR_STATS_PAD) ||
760 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
761 atomic_long_read(&session->stats.rx_bytes),
762 L2TP_ATTR_STATS_PAD) ||
763 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
764 atomic_long_read(&session->stats.rx_seq_discards),
765 L2TP_ATTR_STATS_PAD) ||
766 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
767 atomic_long_read(&session->stats.rx_cookie_discards),
768 L2TP_ATTR_STATS_PAD) ||
769 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
770 atomic_long_read(&session->stats.rx_oos_packets),
771 L2TP_ATTR_STATS_PAD) ||
772 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
773 atomic_long_read(&session->stats.rx_errors),
774 L2TP_ATTR_STATS_PAD))
775 goto nla_put_failure;
776 nla_nest_end(skb, nest);
777
778 genlmsg_end(skb, hdr);
779 return 0;
780
781 nla_put_failure:
782 genlmsg_cancel(skb, hdr);
783 return -1;
784 }
785
786 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
787 {
788 struct l2tp_session *session;
789 struct sk_buff *msg;
790 int ret;
791
792 session = l2tp_nl_session_get(info);
793 if (!session) {
794 ret = -ENODEV;
795 goto err;
796 }
797
798 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
799 if (!msg) {
800 ret = -ENOMEM;
801 goto err_ref;
802 }
803
804 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
805 0, session, L2TP_CMD_SESSION_GET);
806 if (ret < 0)
807 goto err_ref_msg;
808
809 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
810
811 l2tp_session_dec_refcount(session);
812
813 return ret;
814
815 err_ref_msg:
816 nlmsg_free(msg);
817 err_ref:
818 l2tp_session_dec_refcount(session);
819 err:
820 return ret;
821 }
822
823 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
824 {
825 struct net *net = sock_net(skb->sk);
826 struct l2tp_session *session;
827 struct l2tp_tunnel *tunnel = NULL;
828 int ti = cb->args[0];
829 int si = cb->args[1];
830
831 for (;;) {
832 if (!tunnel) {
833 tunnel = l2tp_tunnel_get_nth(net, ti);
834 if (!tunnel)
835 goto out;
836 }
837
838 session = l2tp_session_get_nth(tunnel, si);
839 if (!session) {
840 ti++;
841 l2tp_tunnel_dec_refcount(tunnel);
842 tunnel = NULL;
843 si = 0;
844 continue;
845 }
846
847 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
848 cb->nlh->nlmsg_seq, NLM_F_MULTI,
849 session, L2TP_CMD_SESSION_GET) < 0) {
850 l2tp_session_dec_refcount(session);
851 l2tp_tunnel_dec_refcount(tunnel);
852 break;
853 }
854 l2tp_session_dec_refcount(session);
855
856 si++;
857 }
858
859 out:
860 cb->args[0] = ti;
861 cb->args[1] = si;
862
863 return skb->len;
864 }
865
866 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
867 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
868 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
869 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
870 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
871 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
872 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
873 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
874 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
875 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
876 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
877 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
878 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
879 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
880 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
881 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
882 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
883 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
884 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
885 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
886 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
887 [L2TP_ATTR_FD] = { .type = NLA_U32, },
888 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
889 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
890 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
891 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
892 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
893 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
894 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
895 [L2TP_ATTR_IP6_SADDR] = {
896 .type = NLA_BINARY,
897 .len = sizeof(struct in6_addr),
898 },
899 [L2TP_ATTR_IP6_DADDR] = {
900 .type = NLA_BINARY,
901 .len = sizeof(struct in6_addr),
902 },
903 [L2TP_ATTR_IFNAME] = {
904 .type = NLA_NUL_STRING,
905 .len = IFNAMSIZ - 1,
906 },
907 [L2TP_ATTR_COOKIE] = {
908 .type = NLA_BINARY,
909 .len = 8,
910 },
911 [L2TP_ATTR_PEER_COOKIE] = {
912 .type = NLA_BINARY,
913 .len = 8,
914 },
915 };
916
917 static const struct genl_small_ops l2tp_nl_ops[] = {
918 {
919 .cmd = L2TP_CMD_NOOP,
920 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
921 .doit = l2tp_nl_cmd_noop,
922 /* can be retrieved by unprivileged users */
923 },
924 {
925 .cmd = L2TP_CMD_TUNNEL_CREATE,
926 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
927 .doit = l2tp_nl_cmd_tunnel_create,
928 .flags = GENL_UNS_ADMIN_PERM,
929 },
930 {
931 .cmd = L2TP_CMD_TUNNEL_DELETE,
932 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
933 .doit = l2tp_nl_cmd_tunnel_delete,
934 .flags = GENL_UNS_ADMIN_PERM,
935 },
936 {
937 .cmd = L2TP_CMD_TUNNEL_MODIFY,
938 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
939 .doit = l2tp_nl_cmd_tunnel_modify,
940 .flags = GENL_UNS_ADMIN_PERM,
941 },
942 {
943 .cmd = L2TP_CMD_TUNNEL_GET,
944 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
945 .doit = l2tp_nl_cmd_tunnel_get,
946 .dumpit = l2tp_nl_cmd_tunnel_dump,
947 .flags = GENL_UNS_ADMIN_PERM,
948 },
949 {
950 .cmd = L2TP_CMD_SESSION_CREATE,
951 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
952 .doit = l2tp_nl_cmd_session_create,
953 .flags = GENL_UNS_ADMIN_PERM,
954 },
955 {
956 .cmd = L2TP_CMD_SESSION_DELETE,
957 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
958 .doit = l2tp_nl_cmd_session_delete,
959 .flags = GENL_UNS_ADMIN_PERM,
960 },
961 {
962 .cmd = L2TP_CMD_SESSION_MODIFY,
963 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
964 .doit = l2tp_nl_cmd_session_modify,
965 .flags = GENL_UNS_ADMIN_PERM,
966 },
967 {
968 .cmd = L2TP_CMD_SESSION_GET,
969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
970 .doit = l2tp_nl_cmd_session_get,
971 .dumpit = l2tp_nl_cmd_session_dump,
972 .flags = GENL_UNS_ADMIN_PERM,
973 },
974 };
975
976 static struct genl_family l2tp_nl_family __ro_after_init = {
977 .name = L2TP_GENL_NAME,
978 .version = L2TP_GENL_VERSION,
979 .hdrsize = 0,
980 .maxattr = L2TP_ATTR_MAX,
981 .policy = l2tp_nl_policy,
982 .netnsok = true,
983 .module = THIS_MODULE,
984 .small_ops = l2tp_nl_ops,
985 .n_small_ops = ARRAY_SIZE(l2tp_nl_ops),
986 .mcgrps = l2tp_multicast_group,
987 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
988 };
989
990 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
991 {
992 int ret;
993
994 ret = -EINVAL;
995 if (pw_type >= __L2TP_PWTYPE_MAX)
996 goto err;
997
998 genl_lock();
999 ret = -EBUSY;
1000 if (l2tp_nl_cmd_ops[pw_type])
1001 goto out;
1002
1003 l2tp_nl_cmd_ops[pw_type] = ops;
1004 ret = 0;
1005
1006 out:
1007 genl_unlock();
1008 err:
1009 return ret;
1010 }
1011 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1012
1013 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1014 {
1015 if (pw_type < __L2TP_PWTYPE_MAX) {
1016 genl_lock();
1017 l2tp_nl_cmd_ops[pw_type] = NULL;
1018 genl_unlock();
1019 }
1020 }
1021 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1022
1023 static int __init l2tp_nl_init(void)
1024 {
1025 pr_info("L2TP netlink interface\n");
1026 return genl_register_family(&l2tp_nl_family);
1027 }
1028
1029 static void l2tp_nl_cleanup(void)
1030 {
1031 genl_unregister_family(&l2tp_nl_family);
1032 }
1033
1034 module_init(l2tp_nl_init);
1035 module_exit(l2tp_nl_cleanup);
1036
1037 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1038 MODULE_DESCRIPTION("L2TP netlink");
1039 MODULE_LICENSE("GPL");
1040 MODULE_VERSION("1.0");
1041 MODULE_ALIAS_GENL_FAMILY("l2tp");
Linux with added FPC-III support