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1/*
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 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <net/sock.h>
20#include <net/genetlink.h>
21#include <net/udp.h>
22#include <linux/in.h>
23#include <linux/udp.h>
24#include <linux/socket.h>
25#include <linux/module.h>
26#include <linux/list.h>
27#include <net/net_namespace.h>
28
29#include <linux/l2tp.h>
30
31#include "l2tp_core.h"
32
33
34static struct genl_family l2tp_nl_family;
35
36static const struct genl_multicast_group l2tp_multicast_group[] = {
37 {
38 .name = L2TP_GENL_MCGROUP,
39 },
40};
41
42static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
43 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
44static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
45 int flags, struct l2tp_session *session,
46 u8 cmd);
47
48/* Accessed under genl lock */
49static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
50
51static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info)
52{
53 u32 tunnel_id;
54 u32 session_id;
55 char *ifname;
56 struct l2tp_tunnel *tunnel;
57 struct l2tp_session *session = NULL;
58 struct net *net = genl_info_net(info);
59
60 if (info->attrs[L2TP_ATTR_IFNAME]) {
61 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
62 session = l2tp_session_get_by_ifname(net, ifname);
63 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
64 (info->attrs[L2TP_ATTR_CONN_ID])) {
65 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
66 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
67 tunnel = l2tp_tunnel_get(net, tunnel_id);
68 if (tunnel) {
69 session = l2tp_session_get(net, tunnel, session_id);
70 l2tp_tunnel_dec_refcount(tunnel);
71 }
72 }
73
74 return session;
75}
76
77static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
78{
79 struct sk_buff *msg;
80 void *hdr;
81 int ret = -ENOBUFS;
82
83 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
84 if (!msg) {
85 ret = -ENOMEM;
86 goto out;
87 }
88
89 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
90 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
91 if (!hdr) {
92 ret = -EMSGSIZE;
93 goto err_out;
94 }
95
96 genlmsg_end(msg, hdr);
97
98 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
99
100err_out:
101 nlmsg_free(msg);
102
103out:
104 return ret;
105}
106
107static int l2tp_tunnel_notify(struct genl_family *family,
108 struct genl_info *info,
109 struct l2tp_tunnel *tunnel,
110 u8 cmd)
111{
112 struct sk_buff *msg;
113 int ret;
114
115 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
116 if (!msg)
117 return -ENOMEM;
118
119 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
120 NLM_F_ACK, tunnel, cmd);
121
122 if (ret >= 0) {
123 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
124 /* We don't care if no one is listening */
125 if (ret == -ESRCH)
126 ret = 0;
127 return ret;
128 }
129
130 nlmsg_free(msg);
131
132 return ret;
133}
134
135static int l2tp_session_notify(struct genl_family *family,
136 struct genl_info *info,
137 struct l2tp_session *session,
138 u8 cmd)
139{
140 struct sk_buff *msg;
141 int ret;
142
143 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
144 if (!msg)
145 return -ENOMEM;
146
147 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
148 NLM_F_ACK, session, cmd);
149
150 if (ret >= 0) {
151 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
152 /* We don't care if no one is listening */
153 if (ret == -ESRCH)
154 ret = 0;
155 return ret;
156 }
157
158 nlmsg_free(msg);
159
160 return ret;
161}
162
163static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
164{
165 u32 tunnel_id;
166 u32 peer_tunnel_id;
167 int proto_version;
168 int fd;
169 int ret = 0;
170 struct l2tp_tunnel_cfg cfg = { 0, };
171 struct l2tp_tunnel *tunnel;
172 struct net *net = genl_info_net(info);
173
174 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
175 ret = -EINVAL;
176 goto out;
177 }
178 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
179
180 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
181 ret = -EINVAL;
182 goto out;
183 }
184 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
185
186 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
187 ret = -EINVAL;
188 goto out;
189 }
190 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
191
192 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
193 ret = -EINVAL;
194 goto out;
195 }
196 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
197
198 fd = -1;
199 if (info->attrs[L2TP_ATTR_FD]) {
200 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
201 } else {
202#if IS_ENABLED(CONFIG_IPV6)
203 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
204 info->attrs[L2TP_ATTR_IP6_DADDR]) {
205 cfg.local_ip6 = nla_data(
206 info->attrs[L2TP_ATTR_IP6_SADDR]);
207 cfg.peer_ip6 = nla_data(
208 info->attrs[L2TP_ATTR_IP6_DADDR]);
209 } else
210#endif
211 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
212 info->attrs[L2TP_ATTR_IP_DADDR]) {
213 cfg.local_ip.s_addr = nla_get_in_addr(
214 info->attrs[L2TP_ATTR_IP_SADDR]);
215 cfg.peer_ip.s_addr = nla_get_in_addr(
216 info->attrs[L2TP_ATTR_IP_DADDR]);
217 } else {
218 ret = -EINVAL;
219 goto out;
220 }
221 if (info->attrs[L2TP_ATTR_UDP_SPORT])
222 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
223 if (info->attrs[L2TP_ATTR_UDP_DPORT])
224 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
225 cfg.use_udp_checksums = nla_get_flag(
226 info->attrs[L2TP_ATTR_UDP_CSUM]);
227
228#if IS_ENABLED(CONFIG_IPV6)
229 cfg.udp6_zero_tx_checksums = nla_get_flag(
230 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
231 cfg.udp6_zero_rx_checksums = nla_get_flag(
232 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
233#endif
234 }
235
236 if (info->attrs[L2TP_ATTR_DEBUG])
237 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
238
239 ret = -EINVAL;
240 switch (cfg.encap) {
241 case L2TP_ENCAPTYPE_UDP:
242 case L2TP_ENCAPTYPE_IP:
243 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
244 peer_tunnel_id, &cfg, &tunnel);
245 break;
246 }
247
248 if (ret < 0)
249 goto out;
250
251 l2tp_tunnel_inc_refcount(tunnel);
252 ret = l2tp_tunnel_register(tunnel, net, &cfg);
253 if (ret < 0) {
254 kfree(tunnel);
255 goto out;
256 }
257 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
258 L2TP_CMD_TUNNEL_CREATE);
259 l2tp_tunnel_dec_refcount(tunnel);
260
261out:
262 return ret;
263}
264
265static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
266{
267 struct l2tp_tunnel *tunnel;
268 u32 tunnel_id;
269 int ret = 0;
270 struct net *net = genl_info_net(info);
271
272 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
273 ret = -EINVAL;
274 goto out;
275 }
276 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
277
278 tunnel = l2tp_tunnel_get(net, tunnel_id);
279 if (!tunnel) {
280 ret = -ENODEV;
281 goto out;
282 }
283
284 l2tp_tunnel_notify(&l2tp_nl_family, info,
285 tunnel, L2TP_CMD_TUNNEL_DELETE);
286
287 l2tp_tunnel_delete(tunnel);
288
289 l2tp_tunnel_dec_refcount(tunnel);
290
291out:
292 return ret;
293}
294
295static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
296{
297 struct l2tp_tunnel *tunnel;
298 u32 tunnel_id;
299 int ret = 0;
300 struct net *net = genl_info_net(info);
301
302 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
303 ret = -EINVAL;
304 goto out;
305 }
306 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
307
308 tunnel = l2tp_tunnel_get(net, tunnel_id);
309 if (!tunnel) {
310 ret = -ENODEV;
311 goto out;
312 }
313
314 if (info->attrs[L2TP_ATTR_DEBUG])
315 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
316
317 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
318 tunnel, L2TP_CMD_TUNNEL_MODIFY);
319
320 l2tp_tunnel_dec_refcount(tunnel);
321
322out:
323 return ret;
324}
325
326static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
327 struct l2tp_tunnel *tunnel, u8 cmd)
328{
329 void *hdr;
330 struct nlattr *nest;
331 struct sock *sk = NULL;
332 struct inet_sock *inet;
333#if IS_ENABLED(CONFIG_IPV6)
334 struct ipv6_pinfo *np = NULL;
335#endif
336
337 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
338 if (!hdr)
339 return -EMSGSIZE;
340
341 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
342 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
343 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
344 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
345 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
346 goto nla_put_failure;
347
348 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
349 if (nest == NULL)
350 goto nla_put_failure;
351
352 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
353 atomic_long_read(&tunnel->stats.tx_packets),
354 L2TP_ATTR_STATS_PAD) ||
355 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
356 atomic_long_read(&tunnel->stats.tx_bytes),
357 L2TP_ATTR_STATS_PAD) ||
358 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
359 atomic_long_read(&tunnel->stats.tx_errors),
360 L2TP_ATTR_STATS_PAD) ||
361 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
362 atomic_long_read(&tunnel->stats.rx_packets),
363 L2TP_ATTR_STATS_PAD) ||
364 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
365 atomic_long_read(&tunnel->stats.rx_bytes),
366 L2TP_ATTR_STATS_PAD) ||
367 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
368 atomic_long_read(&tunnel->stats.rx_seq_discards),
369 L2TP_ATTR_STATS_PAD) ||
370 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
371 atomic_long_read(&tunnel->stats.rx_oos_packets),
372 L2TP_ATTR_STATS_PAD) ||
373 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
374 atomic_long_read(&tunnel->stats.rx_errors),
375 L2TP_ATTR_STATS_PAD))
376 goto nla_put_failure;
377 nla_nest_end(skb, nest);
378
379 sk = tunnel->sock;
380 if (!sk)
381 goto out;
382
383#if IS_ENABLED(CONFIG_IPV6)
384 if (sk->sk_family == AF_INET6)
385 np = inet6_sk(sk);
386#endif
387
388 inet = inet_sk(sk);
389
390 switch (tunnel->encap) {
391 case L2TP_ENCAPTYPE_UDP:
392 switch (sk->sk_family) {
393 case AF_INET:
394 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
395 goto nla_put_failure;
396 break;
397#if IS_ENABLED(CONFIG_IPV6)
398 case AF_INET6:
399 if (udp_get_no_check6_tx(sk) &&
400 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
401 goto nla_put_failure;
402 if (udp_get_no_check6_rx(sk) &&
403 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
404 goto nla_put_failure;
405 break;
406#endif
407 }
408 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
409 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
410 goto nla_put_failure;
411 /* fall through */
412 case L2TP_ENCAPTYPE_IP:
413#if IS_ENABLED(CONFIG_IPV6)
414 if (np) {
415 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
416 &np->saddr) ||
417 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
418 &sk->sk_v6_daddr))
419 goto nla_put_failure;
420 } else
421#endif
422 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
423 inet->inet_saddr) ||
424 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
425 inet->inet_daddr))
426 goto nla_put_failure;
427 break;
428 }
429
430out:
431 genlmsg_end(skb, hdr);
432 return 0;
433
434nla_put_failure:
435 genlmsg_cancel(skb, hdr);
436 return -1;
437}
438
439static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
440{
441 struct l2tp_tunnel *tunnel;
442 struct sk_buff *msg;
443 u32 tunnel_id;
444 int ret = -ENOBUFS;
445 struct net *net = genl_info_net(info);
446
447 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
448 ret = -EINVAL;
449 goto err;
450 }
451
452 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
453
454 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
455 if (!msg) {
456 ret = -ENOMEM;
457 goto err;
458 }
459
460 tunnel = l2tp_tunnel_get(net, tunnel_id);
461 if (!tunnel) {
462 ret = -ENODEV;
463 goto err_nlmsg;
464 }
465
466 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
467 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
468 if (ret < 0)
469 goto err_nlmsg_tunnel;
470
471 l2tp_tunnel_dec_refcount(tunnel);
472
473 return genlmsg_unicast(net, msg, info->snd_portid);
474
475err_nlmsg_tunnel:
476 l2tp_tunnel_dec_refcount(tunnel);
477err_nlmsg:
478 nlmsg_free(msg);
479err:
480 return ret;
481}
482
483static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
484{
485 int ti = cb->args[0];
486 struct l2tp_tunnel *tunnel;
487 struct net *net = sock_net(skb->sk);
488
489 for (;;) {
490 tunnel = l2tp_tunnel_get_nth(net, ti);
491 if (tunnel == NULL)
492 goto out;
493
494 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
495 cb->nlh->nlmsg_seq, NLM_F_MULTI,
496 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
497 l2tp_tunnel_dec_refcount(tunnel);
498 goto out;
499 }
500 l2tp_tunnel_dec_refcount(tunnel);
501
502 ti++;
503 }
504
505out:
506 cb->args[0] = ti;
507
508 return skb->len;
509}
510
511static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
512{
513 u32 tunnel_id = 0;
514 u32 session_id;
515 u32 peer_session_id;
516 int ret = 0;
517 struct l2tp_tunnel *tunnel;
518 struct l2tp_session *session;
519 struct l2tp_session_cfg cfg = { 0, };
520 struct net *net = genl_info_net(info);
521
522 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
523 ret = -EINVAL;
524 goto out;
525 }
526
527 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
528 tunnel = l2tp_tunnel_get(net, tunnel_id);
529 if (!tunnel) {
530 ret = -ENODEV;
531 goto out;
532 }
533
534 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
535 ret = -EINVAL;
536 goto out_tunnel;
537 }
538 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
539
540 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
541 ret = -EINVAL;
542 goto out_tunnel;
543 }
544 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
545
546 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
547 ret = -EINVAL;
548 goto out_tunnel;
549 }
550 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
551 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
552 ret = -EINVAL;
553 goto out_tunnel;
554 }
555
556 if (tunnel->version > 2) {
557 if (info->attrs[L2TP_ATTR_DATA_SEQ])
558 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
559
560 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
561 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
562 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
563 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
564 ret = -EINVAL;
565 goto out_tunnel;
566 }
567 } else {
568 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
569 }
570
571 if (info->attrs[L2TP_ATTR_COOKIE]) {
572 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
573 if (len > 8) {
574 ret = -EINVAL;
575 goto out_tunnel;
576 }
577 cfg.cookie_len = len;
578 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
579 }
580 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
581 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
582 if (len > 8) {
583 ret = -EINVAL;
584 goto out_tunnel;
585 }
586 cfg.peer_cookie_len = len;
587 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
588 }
589 if (info->attrs[L2TP_ATTR_IFNAME])
590 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
591
592 if (info->attrs[L2TP_ATTR_VLAN_ID])
593 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
594 }
595
596 if (info->attrs[L2TP_ATTR_DEBUG])
597 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
598
599 if (info->attrs[L2TP_ATTR_RECV_SEQ])
600 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
601
602 if (info->attrs[L2TP_ATTR_SEND_SEQ])
603 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
604
605 if (info->attrs[L2TP_ATTR_LNS_MODE])
606 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
607
608 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
609 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
610
611 if (info->attrs[L2TP_ATTR_MTU])
612 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
613
614 if (info->attrs[L2TP_ATTR_MRU])
615 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
616
617#ifdef CONFIG_MODULES
618 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
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] == NULL) ||
625 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
626 ret = -EPROTONOSUPPORT;
627 goto out_tunnel;
628 }
629
630 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
631 session_id,
632 peer_session_id,
633 &cfg);
634
635 if (ret >= 0) {
636 session = l2tp_session_get(net, tunnel, session_id);
637 if (session) {
638 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
639 L2TP_CMD_SESSION_CREATE);
640 l2tp_session_dec_refcount(session);
641 }
642 }
643
644out_tunnel:
645 l2tp_tunnel_dec_refcount(tunnel);
646out:
647 return ret;
648}
649
650static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
651{
652 int ret = 0;
653 struct l2tp_session *session;
654 u16 pw_type;
655
656 session = l2tp_nl_session_get(info);
657 if (session == NULL) {
658 ret = -ENODEV;
659 goto out;
660 }
661
662 l2tp_session_notify(&l2tp_nl_family, info,
663 session, L2TP_CMD_SESSION_DELETE);
664
665 pw_type = session->pwtype;
666 if (pw_type < __L2TP_PWTYPE_MAX)
667 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
668 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
669
670 l2tp_session_dec_refcount(session);
671
672out:
673 return ret;
674}
675
676static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
677{
678 int ret = 0;
679 struct l2tp_session *session;
680
681 session = l2tp_nl_session_get(info);
682 if (session == NULL) {
683 ret = -ENODEV;
684 goto out;
685 }
686
687 if (info->attrs[L2TP_ATTR_DEBUG])
688 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
689
690 if (info->attrs[L2TP_ATTR_DATA_SEQ])
691 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
692
693 if (info->attrs[L2TP_ATTR_RECV_SEQ])
694 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
695
696 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
697 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
698 l2tp_session_set_header_len(session, session->tunnel->version);
699 }
700
701 if (info->attrs[L2TP_ATTR_LNS_MODE])
702 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
703
704 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
705 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
706
707 if (info->attrs[L2TP_ATTR_MTU])
708 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
709
710 if (info->attrs[L2TP_ATTR_MRU])
711 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
712
713 ret = l2tp_session_notify(&l2tp_nl_family, info,
714 session, L2TP_CMD_SESSION_MODIFY);
715
716 l2tp_session_dec_refcount(session);
717
718out:
719 return ret;
720}
721
722static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
723 struct l2tp_session *session, u8 cmd)
724{
725 void *hdr;
726 struct nlattr *nest;
727 struct l2tp_tunnel *tunnel = session->tunnel;
728 struct sock *sk = NULL;
729
730 sk = tunnel->sock;
731
732 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
733 if (!hdr)
734 return -EMSGSIZE;
735
736 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
737 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
738 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
739 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
740 session->peer_session_id) ||
741 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
742 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
743 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
744 (session->mru &&
745 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
746 goto nla_put_failure;
747
748 if ((session->ifname[0] &&
749 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
750 (session->cookie_len &&
751 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
752 &session->cookie[0])) ||
753 (session->peer_cookie_len &&
754 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
755 &session->peer_cookie[0])) ||
756 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
757 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
758 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
759#ifdef CONFIG_XFRM
760 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
761 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
762#endif
763 (session->reorder_timeout &&
764 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
765 session->reorder_timeout, L2TP_ATTR_PAD)))
766 goto nla_put_failure;
767
768 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
769 if (nest == NULL)
770 goto nla_put_failure;
771
772 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
773 atomic_long_read(&session->stats.tx_packets),
774 L2TP_ATTR_STATS_PAD) ||
775 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
776 atomic_long_read(&session->stats.tx_bytes),
777 L2TP_ATTR_STATS_PAD) ||
778 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
779 atomic_long_read(&session->stats.tx_errors),
780 L2TP_ATTR_STATS_PAD) ||
781 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
782 atomic_long_read(&session->stats.rx_packets),
783 L2TP_ATTR_STATS_PAD) ||
784 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
785 atomic_long_read(&session->stats.rx_bytes),
786 L2TP_ATTR_STATS_PAD) ||
787 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
788 atomic_long_read(&session->stats.rx_seq_discards),
789 L2TP_ATTR_STATS_PAD) ||
790 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
791 atomic_long_read(&session->stats.rx_oos_packets),
792 L2TP_ATTR_STATS_PAD) ||
793 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
794 atomic_long_read(&session->stats.rx_errors),
795 L2TP_ATTR_STATS_PAD))
796 goto nla_put_failure;
797 nla_nest_end(skb, nest);
798
799 genlmsg_end(skb, hdr);
800 return 0;
801
802 nla_put_failure:
803 genlmsg_cancel(skb, hdr);
804 return -1;
805}
806
807static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
808{
809 struct l2tp_session *session;
810 struct sk_buff *msg;
811 int ret;
812
813 session = l2tp_nl_session_get(info);
814 if (session == NULL) {
815 ret = -ENODEV;
816 goto err;
817 }
818
819 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
820 if (!msg) {
821 ret = -ENOMEM;
822 goto err_ref;
823 }
824
825 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
826 0, session, L2TP_CMD_SESSION_GET);
827 if (ret < 0)
828 goto err_ref_msg;
829
830 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
831
832 l2tp_session_dec_refcount(session);
833
834 return ret;
835
836err_ref_msg:
837 nlmsg_free(msg);
838err_ref:
839 l2tp_session_dec_refcount(session);
840err:
841 return ret;
842}
843
844static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
845{
846 struct net *net = sock_net(skb->sk);
847 struct l2tp_session *session;
848 struct l2tp_tunnel *tunnel = NULL;
849 int ti = cb->args[0];
850 int si = cb->args[1];
851
852 for (;;) {
853 if (tunnel == NULL) {
854 tunnel = l2tp_tunnel_get_nth(net, ti);
855 if (tunnel == NULL)
856 goto out;
857 }
858
859 session = l2tp_session_get_nth(tunnel, si);
860 if (session == NULL) {
861 ti++;
862 l2tp_tunnel_dec_refcount(tunnel);
863 tunnel = NULL;
864 si = 0;
865 continue;
866 }
867
868 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
869 cb->nlh->nlmsg_seq, NLM_F_MULTI,
870 session, L2TP_CMD_SESSION_GET) < 0) {
871 l2tp_session_dec_refcount(session);
872 l2tp_tunnel_dec_refcount(tunnel);
873 break;
874 }
875 l2tp_session_dec_refcount(session);
876
877 si++;
878 }
879
880out:
881 cb->args[0] = ti;
882 cb->args[1] = si;
883
884 return skb->len;
885}
886
887static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
888 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
889 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
890 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
891 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
892 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
893 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
894 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
895 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
896 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
897 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
898 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
899 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
900 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
901 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
902 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
903 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
904 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
905 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
906 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
907 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
908 [L2TP_ATTR_FD] = { .type = NLA_U32, },
909 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
910 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
911 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
912 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
913 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
914 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
915 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
916 [L2TP_ATTR_IP6_SADDR] = {
917 .type = NLA_BINARY,
918 .len = sizeof(struct in6_addr),
919 },
920 [L2TP_ATTR_IP6_DADDR] = {
921 .type = NLA_BINARY,
922 .len = sizeof(struct in6_addr),
923 },
924 [L2TP_ATTR_IFNAME] = {
925 .type = NLA_NUL_STRING,
926 .len = IFNAMSIZ - 1,
927 },
928 [L2TP_ATTR_COOKIE] = {
929 .type = NLA_BINARY,
930 .len = 8,
931 },
932 [L2TP_ATTR_PEER_COOKIE] = {
933 .type = NLA_BINARY,
934 .len = 8,
935 },
936};
937
938static const struct genl_ops l2tp_nl_ops[] = {
939 {
940 .cmd = L2TP_CMD_NOOP,
941 .doit = l2tp_nl_cmd_noop,
942 .policy = l2tp_nl_policy,
943 /* can be retrieved by unprivileged users */
944 },
945 {
946 .cmd = L2TP_CMD_TUNNEL_CREATE,
947 .doit = l2tp_nl_cmd_tunnel_create,
948 .policy = l2tp_nl_policy,
949 .flags = GENL_ADMIN_PERM,
950 },
951 {
952 .cmd = L2TP_CMD_TUNNEL_DELETE,
953 .doit = l2tp_nl_cmd_tunnel_delete,
954 .policy = l2tp_nl_policy,
955 .flags = GENL_ADMIN_PERM,
956 },
957 {
958 .cmd = L2TP_CMD_TUNNEL_MODIFY,
959 .doit = l2tp_nl_cmd_tunnel_modify,
960 .policy = l2tp_nl_policy,
961 .flags = GENL_ADMIN_PERM,
962 },
963 {
964 .cmd = L2TP_CMD_TUNNEL_GET,
965 .doit = l2tp_nl_cmd_tunnel_get,
966 .dumpit = l2tp_nl_cmd_tunnel_dump,
967 .policy = l2tp_nl_policy,
968 .flags = GENL_ADMIN_PERM,
969 },
970 {
971 .cmd = L2TP_CMD_SESSION_CREATE,
972 .doit = l2tp_nl_cmd_session_create,
973 .policy = l2tp_nl_policy,
974 .flags = GENL_ADMIN_PERM,
975 },
976 {
977 .cmd = L2TP_CMD_SESSION_DELETE,
978 .doit = l2tp_nl_cmd_session_delete,
979 .policy = l2tp_nl_policy,
980 .flags = GENL_ADMIN_PERM,
981 },
982 {
983 .cmd = L2TP_CMD_SESSION_MODIFY,
984 .doit = l2tp_nl_cmd_session_modify,
985 .policy = l2tp_nl_policy,
986 .flags = GENL_ADMIN_PERM,
987 },
988 {
989 .cmd = L2TP_CMD_SESSION_GET,
990 .doit = l2tp_nl_cmd_session_get,
991 .dumpit = l2tp_nl_cmd_session_dump,
992 .policy = l2tp_nl_policy,
993 .flags = GENL_ADMIN_PERM,
994 },
995};
996
997static struct genl_family l2tp_nl_family __ro_after_init = {
998 .name = L2TP_GENL_NAME,
999 .version = L2TP_GENL_VERSION,
1000 .hdrsize = 0,
1001 .maxattr = L2TP_ATTR_MAX,
1002 .netnsok = true,
1003 .module = THIS_MODULE,
1004 .ops = l2tp_nl_ops,
1005 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1006 .mcgrps = l2tp_multicast_group,
1007 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1008};
1009
1010int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1011{
1012 int ret;
1013
1014 ret = -EINVAL;
1015 if (pw_type >= __L2TP_PWTYPE_MAX)
1016 goto err;
1017
1018 genl_lock();
1019 ret = -EBUSY;
1020 if (l2tp_nl_cmd_ops[pw_type])
1021 goto out;
1022
1023 l2tp_nl_cmd_ops[pw_type] = ops;
1024 ret = 0;
1025
1026out:
1027 genl_unlock();
1028err:
1029 return ret;
1030}
1031EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1032
1033void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1034{
1035 if (pw_type < __L2TP_PWTYPE_MAX) {
1036 genl_lock();
1037 l2tp_nl_cmd_ops[pw_type] = NULL;
1038 genl_unlock();
1039 }
1040}
1041EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1042
1043static int __init l2tp_nl_init(void)
1044{
1045 pr_info("L2TP netlink interface\n");
1046 return genl_register_family(&l2tp_nl_family);
1047}
1048
1049static void l2tp_nl_cleanup(void)
1050{
1051 genl_unregister_family(&l2tp_nl_family);
1052}
1053
1054module_init(l2tp_nl_init);
1055module_exit(l2tp_nl_cleanup);
1056
1057MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1058MODULE_DESCRIPTION("L2TP netlink");
1059MODULE_LICENSE("GPL");
1060MODULE_VERSION("1.0");
1061MODULE_ALIAS_GENL_FAMILY("l2tp");
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
29static struct genl_family l2tp_nl_family;
30
31static const struct genl_multicast_group l2tp_multicast_group[] = {
32 {
33 .name = L2TP_GENL_MCGROUP,
34 },
35};
36
37static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
38 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
39static 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 */
44static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
45
46static 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_session_get(net, tunnel->sock, tunnel->version,
65 tunnel_id, session_id);
66 l2tp_tunnel_put(tunnel);
67 }
68 }
69
70 return session;
71}
72
73static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
74{
75 struct sk_buff *msg;
76 void *hdr;
77 int ret = -ENOBUFS;
78
79 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
80 if (!msg) {
81 ret = -ENOMEM;
82 goto out;
83 }
84
85 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
86 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
87 if (!hdr) {
88 ret = -EMSGSIZE;
89 goto err_out;
90 }
91
92 genlmsg_end(msg, hdr);
93
94 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
95
96err_out:
97 nlmsg_free(msg);
98
99out:
100 return ret;
101}
102
103static int l2tp_tunnel_notify(struct genl_family *family,
104 struct genl_info *info,
105 struct l2tp_tunnel *tunnel,
106 u8 cmd)
107{
108 struct sk_buff *msg;
109 int ret;
110
111 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
112 if (!msg)
113 return -ENOMEM;
114
115 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
116 NLM_F_ACK, tunnel, cmd);
117
118 if (ret >= 0) {
119 ret = genlmsg_multicast_allns(family, msg, 0, 0);
120 /* We don't care if no one is listening */
121 if (ret == -ESRCH)
122 ret = 0;
123 return ret;
124 }
125
126 nlmsg_free(msg);
127
128 return ret;
129}
130
131static int l2tp_session_notify(struct genl_family *family,
132 struct genl_info *info,
133 struct l2tp_session *session,
134 u8 cmd)
135{
136 struct sk_buff *msg;
137 int ret;
138
139 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
140 if (!msg)
141 return -ENOMEM;
142
143 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
144 NLM_F_ACK, session, cmd);
145
146 if (ret >= 0) {
147 ret = genlmsg_multicast_allns(family, msg, 0, 0);
148 /* We don't care if no one is listening */
149 if (ret == -ESRCH)
150 ret = 0;
151 return ret;
152 }
153
154 nlmsg_free(msg);
155
156 return ret;
157}
158
159static int l2tp_nl_cmd_tunnel_create_get_addr(struct nlattr **attrs, struct l2tp_tunnel_cfg *cfg)
160{
161 if (attrs[L2TP_ATTR_UDP_SPORT])
162 cfg->local_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_SPORT]);
163 if (attrs[L2TP_ATTR_UDP_DPORT])
164 cfg->peer_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_DPORT]);
165 cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
166
167 /* Must have either AF_INET or AF_INET6 address for source and destination */
168#if IS_ENABLED(CONFIG_IPV6)
169 if (attrs[L2TP_ATTR_IP6_SADDR] && attrs[L2TP_ATTR_IP6_DADDR]) {
170 cfg->local_ip6 = nla_data(attrs[L2TP_ATTR_IP6_SADDR]);
171 cfg->peer_ip6 = nla_data(attrs[L2TP_ATTR_IP6_DADDR]);
172 cfg->udp6_zero_tx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
173 cfg->udp6_zero_rx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
174 return 0;
175 }
176#endif
177 if (attrs[L2TP_ATTR_IP_SADDR] && attrs[L2TP_ATTR_IP_DADDR]) {
178 cfg->local_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_SADDR]);
179 cfg->peer_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_DADDR]);
180 return 0;
181 }
182 return -EINVAL;
183}
184
185static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
186{
187 u32 tunnel_id;
188 u32 peer_tunnel_id;
189 int proto_version;
190 int fd = -1;
191 int ret = 0;
192 struct l2tp_tunnel_cfg cfg = { 0, };
193 struct l2tp_tunnel *tunnel;
194 struct net *net = genl_info_net(info);
195 struct nlattr **attrs = info->attrs;
196
197 if (!attrs[L2TP_ATTR_CONN_ID]) {
198 ret = -EINVAL;
199 goto out;
200 }
201 tunnel_id = nla_get_u32(attrs[L2TP_ATTR_CONN_ID]);
202
203 if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
204 ret = -EINVAL;
205 goto out;
206 }
207 peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
208
209 if (!attrs[L2TP_ATTR_PROTO_VERSION]) {
210 ret = -EINVAL;
211 goto out;
212 }
213 proto_version = nla_get_u8(attrs[L2TP_ATTR_PROTO_VERSION]);
214
215 if (!attrs[L2TP_ATTR_ENCAP_TYPE]) {
216 ret = -EINVAL;
217 goto out;
218 }
219 cfg.encap = nla_get_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
220
221 /* Managed tunnels take the tunnel socket from userspace.
222 * Unmanaged tunnels must call out the source and destination addresses
223 * for the kernel to create the tunnel socket itself.
224 */
225 if (attrs[L2TP_ATTR_FD]) {
226 fd = nla_get_u32(attrs[L2TP_ATTR_FD]);
227 } else {
228 ret = l2tp_nl_cmd_tunnel_create_get_addr(attrs, &cfg);
229 if (ret < 0)
230 goto out;
231 }
232
233 ret = -EINVAL;
234 switch (cfg.encap) {
235 case L2TP_ENCAPTYPE_UDP:
236 case L2TP_ENCAPTYPE_IP:
237 ret = l2tp_tunnel_create(fd, proto_version, tunnel_id,
238 peer_tunnel_id, &cfg, &tunnel);
239 break;
240 }
241
242 if (ret < 0)
243 goto out;
244
245 refcount_inc(&tunnel->ref_count);
246 ret = l2tp_tunnel_register(tunnel, net, &cfg);
247 if (ret < 0) {
248 kfree(tunnel);
249 goto out;
250 }
251 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
252 L2TP_CMD_TUNNEL_CREATE);
253 l2tp_tunnel_put(tunnel);
254
255out:
256 return ret;
257}
258
259static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
260{
261 struct l2tp_tunnel *tunnel;
262 u32 tunnel_id;
263 int ret = 0;
264 struct net *net = genl_info_net(info);
265
266 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
267 ret = -EINVAL;
268 goto out;
269 }
270 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
271
272 tunnel = l2tp_tunnel_get(net, tunnel_id);
273 if (!tunnel) {
274 ret = -ENODEV;
275 goto out;
276 }
277
278 l2tp_tunnel_notify(&l2tp_nl_family, info,
279 tunnel, L2TP_CMD_TUNNEL_DELETE);
280
281 l2tp_tunnel_delete(tunnel);
282
283 l2tp_tunnel_put(tunnel);
284
285out:
286 return ret;
287}
288
289static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
290{
291 struct l2tp_tunnel *tunnel;
292 u32 tunnel_id;
293 int ret = 0;
294 struct net *net = genl_info_net(info);
295
296 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
297 ret = -EINVAL;
298 goto out;
299 }
300 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
301
302 tunnel = l2tp_tunnel_get(net, tunnel_id);
303 if (!tunnel) {
304 ret = -ENODEV;
305 goto out;
306 }
307
308 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
309 tunnel, L2TP_CMD_TUNNEL_MODIFY);
310
311 l2tp_tunnel_put(tunnel);
312
313out:
314 return ret;
315}
316
317#if IS_ENABLED(CONFIG_IPV6)
318static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
319 enum l2tp_encap_type encap)
320{
321 struct inet_sock *inet = inet_sk(sk);
322 struct ipv6_pinfo *np = inet6_sk(sk);
323
324 switch (encap) {
325 case L2TP_ENCAPTYPE_UDP:
326 if (udp_get_no_check6_tx(sk) &&
327 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
328 return -1;
329 if (udp_get_no_check6_rx(sk) &&
330 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
331 return -1;
332 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
333 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
334 return -1;
335 fallthrough;
336 case L2TP_ENCAPTYPE_IP:
337 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
338 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr))
339 return -1;
340 break;
341 }
342 return 0;
343}
344#endif
345
346static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
347 enum l2tp_encap_type encap)
348{
349 struct inet_sock *inet = inet_sk(sk);
350
351 switch (encap) {
352 case L2TP_ENCAPTYPE_UDP:
353 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
354 nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
355 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
356 return -1;
357 fallthrough;
358 case L2TP_ENCAPTYPE_IP:
359 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
360 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
361 return -1;
362 break;
363 }
364
365 return 0;
366}
367
368/* Append attributes for the tunnel address, handling the different attribute types
369 * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
370 */
371static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel *tunnel)
372{
373 struct sock *sk = tunnel->sock;
374
375 if (!sk)
376 return 0;
377
378#if IS_ENABLED(CONFIG_IPV6)
379 if (sk->sk_family == AF_INET6)
380 return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
381#endif
382 return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
383}
384
385static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
386 struct l2tp_tunnel *tunnel, u8 cmd)
387{
388 void *hdr;
389 struct nlattr *nest;
390
391 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
392 if (!hdr)
393 return -EMSGSIZE;
394
395 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
396 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
397 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
398 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
399 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
400 goto nla_put_failure;
401
402 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
403 if (!nest)
404 goto nla_put_failure;
405
406 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
407 atomic_long_read(&tunnel->stats.tx_packets),
408 L2TP_ATTR_STATS_PAD) ||
409 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
410 atomic_long_read(&tunnel->stats.tx_bytes),
411 L2TP_ATTR_STATS_PAD) ||
412 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
413 atomic_long_read(&tunnel->stats.tx_errors),
414 L2TP_ATTR_STATS_PAD) ||
415 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
416 atomic_long_read(&tunnel->stats.rx_packets),
417 L2TP_ATTR_STATS_PAD) ||
418 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
419 atomic_long_read(&tunnel->stats.rx_bytes),
420 L2TP_ATTR_STATS_PAD) ||
421 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
422 atomic_long_read(&tunnel->stats.rx_seq_discards),
423 L2TP_ATTR_STATS_PAD) ||
424 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
425 atomic_long_read(&tunnel->stats.rx_cookie_discards),
426 L2TP_ATTR_STATS_PAD) ||
427 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
428 atomic_long_read(&tunnel->stats.rx_oos_packets),
429 L2TP_ATTR_STATS_PAD) ||
430 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
431 atomic_long_read(&tunnel->stats.rx_errors),
432 L2TP_ATTR_STATS_PAD) ||
433 nla_put_u64_64bit(skb, L2TP_ATTR_RX_INVALID,
434 atomic_long_read(&tunnel->stats.rx_invalid),
435 L2TP_ATTR_STATS_PAD))
436 goto nla_put_failure;
437 nla_nest_end(skb, nest);
438
439 if (l2tp_nl_tunnel_send_addr(skb, tunnel))
440 goto nla_put_failure;
441
442 genlmsg_end(skb, hdr);
443 return 0;
444
445nla_put_failure:
446 genlmsg_cancel(skb, hdr);
447 return -1;
448}
449
450static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
451{
452 struct l2tp_tunnel *tunnel;
453 struct sk_buff *msg;
454 u32 tunnel_id;
455 int ret = -ENOBUFS;
456 struct net *net = genl_info_net(info);
457
458 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
459 ret = -EINVAL;
460 goto err;
461 }
462
463 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
464
465 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
466 if (!msg) {
467 ret = -ENOMEM;
468 goto err;
469 }
470
471 tunnel = l2tp_tunnel_get(net, tunnel_id);
472 if (!tunnel) {
473 ret = -ENODEV;
474 goto err_nlmsg;
475 }
476
477 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
478 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
479 if (ret < 0)
480 goto err_nlmsg_tunnel;
481
482 l2tp_tunnel_put(tunnel);
483
484 return genlmsg_unicast(net, msg, info->snd_portid);
485
486err_nlmsg_tunnel:
487 l2tp_tunnel_put(tunnel);
488err_nlmsg:
489 nlmsg_free(msg);
490err:
491 return ret;
492}
493
494struct l2tp_nl_cb_data {
495 unsigned long tkey;
496 unsigned long skey;
497};
498
499static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
500{
501 struct l2tp_nl_cb_data *cbd = (void *)&cb->ctx[0];
502 unsigned long key = cbd->tkey;
503 struct l2tp_tunnel *tunnel;
504 struct net *net = sock_net(skb->sk);
505
506 for (;;) {
507 tunnel = l2tp_tunnel_get_next(net, &key);
508 if (!tunnel)
509 goto out;
510
511 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
512 cb->nlh->nlmsg_seq, NLM_F_MULTI,
513 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
514 l2tp_tunnel_put(tunnel);
515 goto out;
516 }
517 l2tp_tunnel_put(tunnel);
518
519 key++;
520 }
521
522out:
523 cbd->tkey = key;
524
525 return skb->len;
526}
527
528static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
529{
530 u32 tunnel_id = 0;
531 u32 session_id;
532 u32 peer_session_id;
533 int ret = 0;
534 struct l2tp_tunnel *tunnel;
535 struct l2tp_session *session;
536 struct l2tp_session_cfg cfg = { 0, };
537 struct net *net = genl_info_net(info);
538
539 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
540 ret = -EINVAL;
541 goto out;
542 }
543
544 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
545 tunnel = l2tp_tunnel_get(net, tunnel_id);
546 if (!tunnel) {
547 ret = -ENODEV;
548 goto out;
549 }
550
551 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
552 ret = -EINVAL;
553 goto out_tunnel;
554 }
555 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
556
557 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
558 ret = -EINVAL;
559 goto out_tunnel;
560 }
561 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
562
563 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
564 ret = -EINVAL;
565 goto out_tunnel;
566 }
567 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
568 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
569 ret = -EINVAL;
570 goto out_tunnel;
571 }
572
573 /* L2TPv2 only accepts PPP pseudo-wires */
574 if (tunnel->version == 2 && cfg.pw_type != L2TP_PWTYPE_PPP) {
575 ret = -EPROTONOSUPPORT;
576 goto out_tunnel;
577 }
578
579 if (tunnel->version > 2) {
580 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
581 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
582 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
583 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
584 ret = -EINVAL;
585 goto out_tunnel;
586 }
587 } else {
588 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
589 }
590
591 if (info->attrs[L2TP_ATTR_COOKIE]) {
592 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
593
594 if (len > 8) {
595 ret = -EINVAL;
596 goto out_tunnel;
597 }
598 cfg.cookie_len = len;
599 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
600 }
601 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
602 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
603
604 if (len > 8) {
605 ret = -EINVAL;
606 goto out_tunnel;
607 }
608 cfg.peer_cookie_len = len;
609 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
610 }
611 if (info->attrs[L2TP_ATTR_IFNAME])
612 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
613 }
614
615 if (info->attrs[L2TP_ATTR_RECV_SEQ])
616 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
617
618 if (info->attrs[L2TP_ATTR_SEND_SEQ])
619 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
620
621 if (info->attrs[L2TP_ATTR_LNS_MODE])
622 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
623
624 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
625 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
626
627#ifdef CONFIG_MODULES
628 if (!l2tp_nl_cmd_ops[cfg.pw_type]) {
629 genl_unlock();
630 request_module("net-l2tp-type-%u", cfg.pw_type);
631 genl_lock();
632 }
633#endif
634 if (!l2tp_nl_cmd_ops[cfg.pw_type] || !l2tp_nl_cmd_ops[cfg.pw_type]->session_create) {
635 ret = -EPROTONOSUPPORT;
636 goto out_tunnel;
637 }
638
639 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
640 session_id,
641 peer_session_id,
642 &cfg);
643
644 if (ret >= 0) {
645 session = l2tp_session_get(net, tunnel->sock, tunnel->version,
646 tunnel_id, session_id);
647 if (session) {
648 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
649 L2TP_CMD_SESSION_CREATE);
650 l2tp_session_put(session);
651 }
652 }
653
654out_tunnel:
655 l2tp_tunnel_put(tunnel);
656out:
657 return ret;
658}
659
660static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
661{
662 int ret = 0;
663 struct l2tp_session *session;
664 u16 pw_type;
665
666 session = l2tp_nl_session_get(info);
667 if (!session) {
668 ret = -ENODEV;
669 goto out;
670 }
671
672 l2tp_session_notify(&l2tp_nl_family, info,
673 session, L2TP_CMD_SESSION_DELETE);
674
675 pw_type = session->pwtype;
676 if (pw_type < __L2TP_PWTYPE_MAX)
677 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
678 l2tp_nl_cmd_ops[pw_type]->session_delete(session);
679
680 l2tp_session_put(session);
681
682out:
683 return ret;
684}
685
686static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
687{
688 int ret = 0;
689 struct l2tp_session *session;
690
691 session = l2tp_nl_session_get(info);
692 if (!session) {
693 ret = -ENODEV;
694 goto out;
695 }
696
697 if (info->attrs[L2TP_ATTR_RECV_SEQ])
698 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
699
700 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
701 struct l2tp_tunnel *tunnel = session->tunnel;
702
703 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
704 l2tp_session_set_header_len(session, tunnel->version, tunnel->encap);
705 }
706
707 if (info->attrs[L2TP_ATTR_LNS_MODE])
708 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
709
710 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
711 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
712
713 ret = l2tp_session_notify(&l2tp_nl_family, info,
714 session, L2TP_CMD_SESSION_MODIFY);
715
716 l2tp_session_put(session);
717
718out:
719 return ret;
720}
721
722static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
723 struct l2tp_session *session, u8 cmd)
724{
725 void *hdr;
726 struct nlattr *nest;
727 struct l2tp_tunnel *tunnel = session->tunnel;
728
729 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
730 if (!hdr)
731 return -EMSGSIZE;
732
733 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
734 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
735 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
736 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) ||
737 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
738 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype))
739 goto nla_put_failure;
740
741 if ((session->ifname[0] &&
742 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
743 (session->cookie_len &&
744 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, session->cookie)) ||
745 (session->peer_cookie_len &&
746 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, session->peer_cookie)) ||
747 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
748 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
749 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
750 (l2tp_tunnel_uses_xfrm(tunnel) &&
751 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
752 (session->reorder_timeout &&
753 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
754 session->reorder_timeout, L2TP_ATTR_PAD)))
755 goto nla_put_failure;
756
757 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
758 if (!nest)
759 goto nla_put_failure;
760
761 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
762 atomic_long_read(&session->stats.tx_packets),
763 L2TP_ATTR_STATS_PAD) ||
764 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
765 atomic_long_read(&session->stats.tx_bytes),
766 L2TP_ATTR_STATS_PAD) ||
767 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
768 atomic_long_read(&session->stats.tx_errors),
769 L2TP_ATTR_STATS_PAD) ||
770 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
771 atomic_long_read(&session->stats.rx_packets),
772 L2TP_ATTR_STATS_PAD) ||
773 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
774 atomic_long_read(&session->stats.rx_bytes),
775 L2TP_ATTR_STATS_PAD) ||
776 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
777 atomic_long_read(&session->stats.rx_seq_discards),
778 L2TP_ATTR_STATS_PAD) ||
779 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
780 atomic_long_read(&session->stats.rx_cookie_discards),
781 L2TP_ATTR_STATS_PAD) ||
782 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
783 atomic_long_read(&session->stats.rx_oos_packets),
784 L2TP_ATTR_STATS_PAD) ||
785 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
786 atomic_long_read(&session->stats.rx_errors),
787 L2TP_ATTR_STATS_PAD) ||
788 nla_put_u64_64bit(skb, L2TP_ATTR_RX_INVALID,
789 atomic_long_read(&session->stats.rx_invalid),
790 L2TP_ATTR_STATS_PAD))
791 goto nla_put_failure;
792 nla_nest_end(skb, nest);
793
794 genlmsg_end(skb, hdr);
795 return 0;
796
797 nla_put_failure:
798 genlmsg_cancel(skb, hdr);
799 return -1;
800}
801
802static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
803{
804 struct l2tp_session *session;
805 struct sk_buff *msg;
806 int ret;
807
808 session = l2tp_nl_session_get(info);
809 if (!session) {
810 ret = -ENODEV;
811 goto err;
812 }
813
814 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
815 if (!msg) {
816 ret = -ENOMEM;
817 goto err_ref;
818 }
819
820 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
821 0, session, L2TP_CMD_SESSION_GET);
822 if (ret < 0)
823 goto err_ref_msg;
824
825 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
826
827 l2tp_session_put(session);
828
829 return ret;
830
831err_ref_msg:
832 nlmsg_free(msg);
833err_ref:
834 l2tp_session_put(session);
835err:
836 return ret;
837}
838
839static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
840{
841 struct l2tp_nl_cb_data *cbd = (void *)&cb->ctx[0];
842 struct net *net = sock_net(skb->sk);
843 struct l2tp_session *session;
844 struct l2tp_tunnel *tunnel = NULL;
845 unsigned long tkey = cbd->tkey;
846 unsigned long skey = cbd->skey;
847
848 for (;;) {
849 if (!tunnel) {
850 tunnel = l2tp_tunnel_get_next(net, &tkey);
851 if (!tunnel)
852 goto out;
853 }
854
855 session = l2tp_session_get_next(net, tunnel->sock, tunnel->version,
856 tunnel->tunnel_id, &skey);
857 if (!session) {
858 tkey++;
859 l2tp_tunnel_put(tunnel);
860 tunnel = NULL;
861 skey = 0;
862 continue;
863 }
864
865 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
866 cb->nlh->nlmsg_seq, NLM_F_MULTI,
867 session, L2TP_CMD_SESSION_GET) < 0) {
868 l2tp_session_put(session);
869 l2tp_tunnel_put(tunnel);
870 break;
871 }
872 l2tp_session_put(session);
873
874 skey++;
875 }
876
877out:
878 cbd->tkey = tkey;
879 cbd->skey = skey;
880
881 return skb->len;
882}
883
884static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
885 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
886 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
887 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
888 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
889 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
890 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
891 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
892 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
893 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
894 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
895 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
896 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
897 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
898 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
899 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
900 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
901 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
902 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
903 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
904 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
905 [L2TP_ATTR_FD] = { .type = NLA_U32, },
906 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
907 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
908 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
909 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
910 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
911 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
912 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
913 [L2TP_ATTR_IP6_SADDR] = {
914 .type = NLA_BINARY,
915 .len = sizeof(struct in6_addr),
916 },
917 [L2TP_ATTR_IP6_DADDR] = {
918 .type = NLA_BINARY,
919 .len = sizeof(struct in6_addr),
920 },
921 [L2TP_ATTR_IFNAME] = {
922 .type = NLA_NUL_STRING,
923 .len = IFNAMSIZ - 1,
924 },
925 [L2TP_ATTR_COOKIE] = {
926 .type = NLA_BINARY,
927 .len = 8,
928 },
929 [L2TP_ATTR_PEER_COOKIE] = {
930 .type = NLA_BINARY,
931 .len = 8,
932 },
933};
934
935static const struct genl_small_ops l2tp_nl_ops[] = {
936 {
937 .cmd = L2TP_CMD_NOOP,
938 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
939 .doit = l2tp_nl_cmd_noop,
940 /* can be retrieved by unprivileged users */
941 },
942 {
943 .cmd = L2TP_CMD_TUNNEL_CREATE,
944 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
945 .doit = l2tp_nl_cmd_tunnel_create,
946 .flags = GENL_UNS_ADMIN_PERM,
947 },
948 {
949 .cmd = L2TP_CMD_TUNNEL_DELETE,
950 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
951 .doit = l2tp_nl_cmd_tunnel_delete,
952 .flags = GENL_UNS_ADMIN_PERM,
953 },
954 {
955 .cmd = L2TP_CMD_TUNNEL_MODIFY,
956 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
957 .doit = l2tp_nl_cmd_tunnel_modify,
958 .flags = GENL_UNS_ADMIN_PERM,
959 },
960 {
961 .cmd = L2TP_CMD_TUNNEL_GET,
962 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
963 .doit = l2tp_nl_cmd_tunnel_get,
964 .dumpit = l2tp_nl_cmd_tunnel_dump,
965 .flags = GENL_UNS_ADMIN_PERM,
966 },
967 {
968 .cmd = L2TP_CMD_SESSION_CREATE,
969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
970 .doit = l2tp_nl_cmd_session_create,
971 .flags = GENL_UNS_ADMIN_PERM,
972 },
973 {
974 .cmd = L2TP_CMD_SESSION_DELETE,
975 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
976 .doit = l2tp_nl_cmd_session_delete,
977 .flags = GENL_UNS_ADMIN_PERM,
978 },
979 {
980 .cmd = L2TP_CMD_SESSION_MODIFY,
981 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
982 .doit = l2tp_nl_cmd_session_modify,
983 .flags = GENL_UNS_ADMIN_PERM,
984 },
985 {
986 .cmd = L2TP_CMD_SESSION_GET,
987 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
988 .doit = l2tp_nl_cmd_session_get,
989 .dumpit = l2tp_nl_cmd_session_dump,
990 .flags = GENL_UNS_ADMIN_PERM,
991 },
992};
993
994static struct genl_family l2tp_nl_family __ro_after_init = {
995 .name = L2TP_GENL_NAME,
996 .version = L2TP_GENL_VERSION,
997 .hdrsize = 0,
998 .maxattr = L2TP_ATTR_MAX,
999 .policy = l2tp_nl_policy,
1000 .netnsok = true,
1001 .module = THIS_MODULE,
1002 .small_ops = l2tp_nl_ops,
1003 .n_small_ops = ARRAY_SIZE(l2tp_nl_ops),
1004 .resv_start_op = L2TP_CMD_SESSION_GET + 1,
1005 .mcgrps = l2tp_multicast_group,
1006 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1007};
1008
1009int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1010{
1011 int ret;
1012
1013 ret = -EINVAL;
1014 if (pw_type >= __L2TP_PWTYPE_MAX)
1015 goto err;
1016
1017 genl_lock();
1018 ret = -EBUSY;
1019 if (l2tp_nl_cmd_ops[pw_type])
1020 goto out;
1021
1022 l2tp_nl_cmd_ops[pw_type] = ops;
1023 ret = 0;
1024
1025out:
1026 genl_unlock();
1027err:
1028 return ret;
1029}
1030EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1031
1032void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1033{
1034 if (pw_type < __L2TP_PWTYPE_MAX) {
1035 genl_lock();
1036 l2tp_nl_cmd_ops[pw_type] = NULL;
1037 genl_unlock();
1038 }
1039}
1040EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1041
1042static int __init l2tp_nl_init(void)
1043{
1044 pr_info("L2TP netlink interface\n");
1045 return genl_register_family(&l2tp_nl_family);
1046}
1047
1048static void l2tp_nl_cleanup(void)
1049{
1050 genl_unregister_family(&l2tp_nl_family);
1051}
1052
1053module_init(l2tp_nl_init);
1054module_exit(l2tp_nl_cleanup);
1055
1056MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1057MODULE_DESCRIPTION("L2TP netlink");
1058MODULE_LICENSE("GPL");
1059MODULE_VERSION("1.0");
1060MODULE_ALIAS_GENL_FAMILY("l2tp");