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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/*
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 .id = GENL_ID_GENERATE,
36 .name = L2TP_GENL_NAME,
37 .version = L2TP_GENL_VERSION,
38 .hdrsize = 0,
39 .maxattr = L2TP_ATTR_MAX,
40};
41
42/* Accessed under genl lock */
43static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
44
45static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
46{
47 u32 tunnel_id;
48 u32 session_id;
49 char *ifname;
50 struct l2tp_tunnel *tunnel;
51 struct l2tp_session *session = NULL;
52 struct net *net = genl_info_net(info);
53
54 if (info->attrs[L2TP_ATTR_IFNAME]) {
55 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
56 session = l2tp_session_find_by_ifname(net, ifname);
57 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
58 (info->attrs[L2TP_ATTR_CONN_ID])) {
59 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
60 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
61 tunnel = l2tp_tunnel_find(net, tunnel_id);
62 if (tunnel)
63 session = l2tp_session_find(net, tunnel, session_id);
64 }
65
66 return session;
67}
68
69static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
70{
71 struct sk_buff *msg;
72 void *hdr;
73 int ret = -ENOBUFS;
74
75 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
76 if (!msg) {
77 ret = -ENOMEM;
78 goto out;
79 }
80
81 hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
82 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
83 if (IS_ERR(hdr)) {
84 ret = PTR_ERR(hdr);
85 goto err_out;
86 }
87
88 genlmsg_end(msg, hdr);
89
90 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
91
92err_out:
93 nlmsg_free(msg);
94
95out:
96 return ret;
97}
98
99static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
100{
101 u32 tunnel_id;
102 u32 peer_tunnel_id;
103 int proto_version;
104 int fd;
105 int ret = 0;
106 struct l2tp_tunnel_cfg cfg = { 0, };
107 struct l2tp_tunnel *tunnel;
108 struct net *net = genl_info_net(info);
109
110 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
111 ret = -EINVAL;
112 goto out;
113 }
114 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
115
116 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
117 ret = -EINVAL;
118 goto out;
119 }
120 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
121
122 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
123 ret = -EINVAL;
124 goto out;
125 }
126 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
127
128 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
129 ret = -EINVAL;
130 goto out;
131 }
132 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
133
134 fd = -1;
135 if (info->attrs[L2TP_ATTR_FD]) {
136 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
137 } else {
138#if IS_ENABLED(CONFIG_IPV6)
139 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
140 info->attrs[L2TP_ATTR_IP6_DADDR]) {
141 cfg.local_ip6 = nla_data(
142 info->attrs[L2TP_ATTR_IP6_SADDR]);
143 cfg.peer_ip6 = nla_data(
144 info->attrs[L2TP_ATTR_IP6_DADDR]);
145 } else
146#endif
147 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
148 info->attrs[L2TP_ATTR_IP_DADDR]) {
149 cfg.local_ip.s_addr = nla_get_be32(
150 info->attrs[L2TP_ATTR_IP_SADDR]);
151 cfg.peer_ip.s_addr = nla_get_be32(
152 info->attrs[L2TP_ATTR_IP_DADDR]);
153 } else {
154 ret = -EINVAL;
155 goto out;
156 }
157 if (info->attrs[L2TP_ATTR_UDP_SPORT])
158 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
159 if (info->attrs[L2TP_ATTR_UDP_DPORT])
160 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
161 if (info->attrs[L2TP_ATTR_UDP_CSUM])
162 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
163 }
164
165 if (info->attrs[L2TP_ATTR_DEBUG])
166 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
167
168 tunnel = l2tp_tunnel_find(net, tunnel_id);
169 if (tunnel != NULL) {
170 ret = -EEXIST;
171 goto out;
172 }
173
174 ret = -EINVAL;
175 switch (cfg.encap) {
176 case L2TP_ENCAPTYPE_UDP:
177 case L2TP_ENCAPTYPE_IP:
178 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
179 peer_tunnel_id, &cfg, &tunnel);
180 break;
181 }
182
183out:
184 return ret;
185}
186
187static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
188{
189 struct l2tp_tunnel *tunnel;
190 u32 tunnel_id;
191 int ret = 0;
192 struct net *net = genl_info_net(info);
193
194 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
195 ret = -EINVAL;
196 goto out;
197 }
198 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
199
200 tunnel = l2tp_tunnel_find(net, tunnel_id);
201 if (tunnel == NULL) {
202 ret = -ENODEV;
203 goto out;
204 }
205
206 (void) l2tp_tunnel_delete(tunnel);
207
208out:
209 return ret;
210}
211
212static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
213{
214 struct l2tp_tunnel *tunnel;
215 u32 tunnel_id;
216 int ret = 0;
217 struct net *net = genl_info_net(info);
218
219 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
220 ret = -EINVAL;
221 goto out;
222 }
223 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
224
225 tunnel = l2tp_tunnel_find(net, tunnel_id);
226 if (tunnel == NULL) {
227 ret = -ENODEV;
228 goto out;
229 }
230
231 if (info->attrs[L2TP_ATTR_DEBUG])
232 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
233
234out:
235 return ret;
236}
237
238static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
239 struct l2tp_tunnel *tunnel)
240{
241 void *hdr;
242 struct nlattr *nest;
243 struct sock *sk = NULL;
244 struct inet_sock *inet;
245#if IS_ENABLED(CONFIG_IPV6)
246 struct ipv6_pinfo *np = NULL;
247#endif
248 struct l2tp_stats stats;
249 unsigned int start;
250
251 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
252 L2TP_CMD_TUNNEL_GET);
253 if (IS_ERR(hdr))
254 return PTR_ERR(hdr);
255
256 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
257 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
258 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
259 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
260 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
261 goto nla_put_failure;
262
263 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
264 if (nest == NULL)
265 goto nla_put_failure;
266
267 do {
268 start = u64_stats_fetch_begin(&tunnel->stats.syncp);
269 stats.tx_packets = tunnel->stats.tx_packets;
270 stats.tx_bytes = tunnel->stats.tx_bytes;
271 stats.tx_errors = tunnel->stats.tx_errors;
272 stats.rx_packets = tunnel->stats.rx_packets;
273 stats.rx_bytes = tunnel->stats.rx_bytes;
274 stats.rx_errors = tunnel->stats.rx_errors;
275 stats.rx_seq_discards = tunnel->stats.rx_seq_discards;
276 stats.rx_oos_packets = tunnel->stats.rx_oos_packets;
277 } while (u64_stats_fetch_retry(&tunnel->stats.syncp, start));
278
279 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
280 nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
281 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
282 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
283 nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
284 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
285 stats.rx_seq_discards) ||
286 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
287 stats.rx_oos_packets) ||
288 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
289 goto nla_put_failure;
290 nla_nest_end(skb, nest);
291
292 sk = tunnel->sock;
293 if (!sk)
294 goto out;
295
296#if IS_ENABLED(CONFIG_IPV6)
297 if (sk->sk_family == AF_INET6)
298 np = inet6_sk(sk);
299#endif
300
301 inet = inet_sk(sk);
302
303 switch (tunnel->encap) {
304 case L2TP_ENCAPTYPE_UDP:
305 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
306 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
307 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM,
308 (sk->sk_no_check != UDP_CSUM_NOXMIT)))
309 goto nla_put_failure;
310 /* NOBREAK */
311 case L2TP_ENCAPTYPE_IP:
312#if IS_ENABLED(CONFIG_IPV6)
313 if (np) {
314 if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
315 &np->saddr) ||
316 nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr),
317 &np->daddr))
318 goto nla_put_failure;
319 } else
320#endif
321 if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
322 nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
323 goto nla_put_failure;
324 break;
325 }
326
327out:
328 return genlmsg_end(skb, hdr);
329
330nla_put_failure:
331 genlmsg_cancel(skb, hdr);
332 return -1;
333}
334
335static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
336{
337 struct l2tp_tunnel *tunnel;
338 struct sk_buff *msg;
339 u32 tunnel_id;
340 int ret = -ENOBUFS;
341 struct net *net = genl_info_net(info);
342
343 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
344 ret = -EINVAL;
345 goto out;
346 }
347
348 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
349
350 tunnel = l2tp_tunnel_find(net, tunnel_id);
351 if (tunnel == NULL) {
352 ret = -ENODEV;
353 goto out;
354 }
355
356 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
357 if (!msg) {
358 ret = -ENOMEM;
359 goto out;
360 }
361
362 ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
363 NLM_F_ACK, tunnel);
364 if (ret < 0)
365 goto err_out;
366
367 return genlmsg_unicast(net, msg, info->snd_pid);
368
369err_out:
370 nlmsg_free(msg);
371
372out:
373 return ret;
374}
375
376static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
377{
378 int ti = cb->args[0];
379 struct l2tp_tunnel *tunnel;
380 struct net *net = sock_net(skb->sk);
381
382 for (;;) {
383 tunnel = l2tp_tunnel_find_nth(net, ti);
384 if (tunnel == NULL)
385 goto out;
386
387 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
388 cb->nlh->nlmsg_seq, NLM_F_MULTI,
389 tunnel) <= 0)
390 goto out;
391
392 ti++;
393 }
394
395out:
396 cb->args[0] = ti;
397
398 return skb->len;
399}
400
401static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
402{
403 u32 tunnel_id = 0;
404 u32 session_id;
405 u32 peer_session_id;
406 int ret = 0;
407 struct l2tp_tunnel *tunnel;
408 struct l2tp_session *session;
409 struct l2tp_session_cfg cfg = { 0, };
410 struct net *net = genl_info_net(info);
411
412 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
413 ret = -EINVAL;
414 goto out;
415 }
416 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
417 tunnel = l2tp_tunnel_find(net, tunnel_id);
418 if (!tunnel) {
419 ret = -ENODEV;
420 goto out;
421 }
422
423 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
424 ret = -EINVAL;
425 goto out;
426 }
427 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
428 session = l2tp_session_find(net, tunnel, session_id);
429 if (session) {
430 ret = -EEXIST;
431 goto out;
432 }
433
434 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
435 ret = -EINVAL;
436 goto out;
437 }
438 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
439
440 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
441 ret = -EINVAL;
442 goto out;
443 }
444 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
445 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
446 ret = -EINVAL;
447 goto out;
448 }
449
450 if (tunnel->version > 2) {
451 if (info->attrs[L2TP_ATTR_OFFSET])
452 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
453
454 if (info->attrs[L2TP_ATTR_DATA_SEQ])
455 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
456
457 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
458 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
459 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
460
461 cfg.l2specific_len = 4;
462 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
463 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
464
465 if (info->attrs[L2TP_ATTR_COOKIE]) {
466 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
467 if (len > 8) {
468 ret = -EINVAL;
469 goto out;
470 }
471 cfg.cookie_len = len;
472 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
473 }
474 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
475 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
476 if (len > 8) {
477 ret = -EINVAL;
478 goto out;
479 }
480 cfg.peer_cookie_len = len;
481 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
482 }
483 if (info->attrs[L2TP_ATTR_IFNAME])
484 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
485
486 if (info->attrs[L2TP_ATTR_VLAN_ID])
487 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
488 }
489
490 if (info->attrs[L2TP_ATTR_DEBUG])
491 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
492
493 if (info->attrs[L2TP_ATTR_RECV_SEQ])
494 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
495
496 if (info->attrs[L2TP_ATTR_SEND_SEQ])
497 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
498
499 if (info->attrs[L2TP_ATTR_LNS_MODE])
500 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
501
502 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
503 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
504
505 if (info->attrs[L2TP_ATTR_MTU])
506 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
507
508 if (info->attrs[L2TP_ATTR_MRU])
509 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
510
511 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
512 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
513 ret = -EPROTONOSUPPORT;
514 goto out;
515 }
516
517 /* Check that pseudowire-specific params are present */
518 switch (cfg.pw_type) {
519 case L2TP_PWTYPE_NONE:
520 break;
521 case L2TP_PWTYPE_ETH_VLAN:
522 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
523 ret = -EINVAL;
524 goto out;
525 }
526 break;
527 case L2TP_PWTYPE_ETH:
528 break;
529 case L2TP_PWTYPE_PPP:
530 case L2TP_PWTYPE_PPP_AC:
531 break;
532 case L2TP_PWTYPE_IP:
533 default:
534 ret = -EPROTONOSUPPORT;
535 break;
536 }
537
538 ret = -EPROTONOSUPPORT;
539 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
540 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
541 session_id, peer_session_id, &cfg);
542
543out:
544 return ret;
545}
546
547static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
548{
549 int ret = 0;
550 struct l2tp_session *session;
551 u16 pw_type;
552
553 session = l2tp_nl_session_find(info);
554 if (session == NULL) {
555 ret = -ENODEV;
556 goto out;
557 }
558
559 pw_type = session->pwtype;
560 if (pw_type < __L2TP_PWTYPE_MAX)
561 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
562 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
563
564out:
565 return ret;
566}
567
568static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
569{
570 int ret = 0;
571 struct l2tp_session *session;
572
573 session = l2tp_nl_session_find(info);
574 if (session == NULL) {
575 ret = -ENODEV;
576 goto out;
577 }
578
579 if (info->attrs[L2TP_ATTR_DEBUG])
580 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
581
582 if (info->attrs[L2TP_ATTR_DATA_SEQ])
583 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
584
585 if (info->attrs[L2TP_ATTR_RECV_SEQ])
586 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
587
588 if (info->attrs[L2TP_ATTR_SEND_SEQ])
589 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
590
591 if (info->attrs[L2TP_ATTR_LNS_MODE])
592 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
593
594 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
595 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
596
597 if (info->attrs[L2TP_ATTR_MTU])
598 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
599
600 if (info->attrs[L2TP_ATTR_MRU])
601 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
602
603out:
604 return ret;
605}
606
607static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
608 struct l2tp_session *session)
609{
610 void *hdr;
611 struct nlattr *nest;
612 struct l2tp_tunnel *tunnel = session->tunnel;
613 struct sock *sk = NULL;
614 struct l2tp_stats stats;
615 unsigned int start;
616
617 sk = tunnel->sock;
618
619 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
620 if (IS_ERR(hdr))
621 return PTR_ERR(hdr);
622
623 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
624 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
625 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
626 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
627 session->peer_session_id) ||
628 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
629 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
630 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
631 (session->mru &&
632 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
633 goto nla_put_failure;
634
635 if ((session->ifname && session->ifname[0] &&
636 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
637 (session->cookie_len &&
638 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
639 &session->cookie[0])) ||
640 (session->peer_cookie_len &&
641 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
642 &session->peer_cookie[0])) ||
643 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
644 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
645 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
646#ifdef CONFIG_XFRM
647 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
648 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
649#endif
650 (session->reorder_timeout &&
651 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
652 goto nla_put_failure;
653
654 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
655 if (nest == NULL)
656 goto nla_put_failure;
657
658 do {
659 start = u64_stats_fetch_begin(&session->stats.syncp);
660 stats.tx_packets = session->stats.tx_packets;
661 stats.tx_bytes = session->stats.tx_bytes;
662 stats.tx_errors = session->stats.tx_errors;
663 stats.rx_packets = session->stats.rx_packets;
664 stats.rx_bytes = session->stats.rx_bytes;
665 stats.rx_errors = session->stats.rx_errors;
666 stats.rx_seq_discards = session->stats.rx_seq_discards;
667 stats.rx_oos_packets = session->stats.rx_oos_packets;
668 } while (u64_stats_fetch_retry(&session->stats.syncp, start));
669
670 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
671 nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
672 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
673 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
674 nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
675 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
676 stats.rx_seq_discards) ||
677 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
678 stats.rx_oos_packets) ||
679 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
680 goto nla_put_failure;
681 nla_nest_end(skb, nest);
682
683 return genlmsg_end(skb, hdr);
684
685 nla_put_failure:
686 genlmsg_cancel(skb, hdr);
687 return -1;
688}
689
690static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
691{
692 struct l2tp_session *session;
693 struct sk_buff *msg;
694 int ret;
695
696 session = l2tp_nl_session_find(info);
697 if (session == NULL) {
698 ret = -ENODEV;
699 goto out;
700 }
701
702 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
703 if (!msg) {
704 ret = -ENOMEM;
705 goto out;
706 }
707
708 ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
709 0, session);
710 if (ret < 0)
711 goto err_out;
712
713 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
714
715err_out:
716 nlmsg_free(msg);
717
718out:
719 return ret;
720}
721
722static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
723{
724 struct net *net = sock_net(skb->sk);
725 struct l2tp_session *session;
726 struct l2tp_tunnel *tunnel = NULL;
727 int ti = cb->args[0];
728 int si = cb->args[1];
729
730 for (;;) {
731 if (tunnel == NULL) {
732 tunnel = l2tp_tunnel_find_nth(net, ti);
733 if (tunnel == NULL)
734 goto out;
735 }
736
737 session = l2tp_session_find_nth(tunnel, si);
738 if (session == NULL) {
739 ti++;
740 tunnel = NULL;
741 si = 0;
742 continue;
743 }
744
745 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
746 cb->nlh->nlmsg_seq, NLM_F_MULTI,
747 session) <= 0)
748 break;
749
750 si++;
751 }
752
753out:
754 cb->args[0] = ti;
755 cb->args[1] = si;
756
757 return skb->len;
758}
759
760static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
761 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
762 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
763 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
764 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
765 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
766 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
767 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
768 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
769 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
770 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
771 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
772 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
773 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
774 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
775 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
776 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
777 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
778 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
779 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
780 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
781 [L2TP_ATTR_FD] = { .type = NLA_U32, },
782 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
783 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
784 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
785 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
786 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
787 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
788 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
789 [L2TP_ATTR_IP6_SADDR] = {
790 .type = NLA_BINARY,
791 .len = sizeof(struct in6_addr),
792 },
793 [L2TP_ATTR_IP6_DADDR] = {
794 .type = NLA_BINARY,
795 .len = sizeof(struct in6_addr),
796 },
797 [L2TP_ATTR_IFNAME] = {
798 .type = NLA_NUL_STRING,
799 .len = IFNAMSIZ - 1,
800 },
801 [L2TP_ATTR_COOKIE] = {
802 .type = NLA_BINARY,
803 .len = 8,
804 },
805 [L2TP_ATTR_PEER_COOKIE] = {
806 .type = NLA_BINARY,
807 .len = 8,
808 },
809};
810
811static struct genl_ops l2tp_nl_ops[] = {
812 {
813 .cmd = L2TP_CMD_NOOP,
814 .doit = l2tp_nl_cmd_noop,
815 .policy = l2tp_nl_policy,
816 /* can be retrieved by unprivileged users */
817 },
818 {
819 .cmd = L2TP_CMD_TUNNEL_CREATE,
820 .doit = l2tp_nl_cmd_tunnel_create,
821 .policy = l2tp_nl_policy,
822 .flags = GENL_ADMIN_PERM,
823 },
824 {
825 .cmd = L2TP_CMD_TUNNEL_DELETE,
826 .doit = l2tp_nl_cmd_tunnel_delete,
827 .policy = l2tp_nl_policy,
828 .flags = GENL_ADMIN_PERM,
829 },
830 {
831 .cmd = L2TP_CMD_TUNNEL_MODIFY,
832 .doit = l2tp_nl_cmd_tunnel_modify,
833 .policy = l2tp_nl_policy,
834 .flags = GENL_ADMIN_PERM,
835 },
836 {
837 .cmd = L2TP_CMD_TUNNEL_GET,
838 .doit = l2tp_nl_cmd_tunnel_get,
839 .dumpit = l2tp_nl_cmd_tunnel_dump,
840 .policy = l2tp_nl_policy,
841 .flags = GENL_ADMIN_PERM,
842 },
843 {
844 .cmd = L2TP_CMD_SESSION_CREATE,
845 .doit = l2tp_nl_cmd_session_create,
846 .policy = l2tp_nl_policy,
847 .flags = GENL_ADMIN_PERM,
848 },
849 {
850 .cmd = L2TP_CMD_SESSION_DELETE,
851 .doit = l2tp_nl_cmd_session_delete,
852 .policy = l2tp_nl_policy,
853 .flags = GENL_ADMIN_PERM,
854 },
855 {
856 .cmd = L2TP_CMD_SESSION_MODIFY,
857 .doit = l2tp_nl_cmd_session_modify,
858 .policy = l2tp_nl_policy,
859 .flags = GENL_ADMIN_PERM,
860 },
861 {
862 .cmd = L2TP_CMD_SESSION_GET,
863 .doit = l2tp_nl_cmd_session_get,
864 .dumpit = l2tp_nl_cmd_session_dump,
865 .policy = l2tp_nl_policy,
866 .flags = GENL_ADMIN_PERM,
867 },
868};
869
870int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
871{
872 int ret;
873
874 ret = -EINVAL;
875 if (pw_type >= __L2TP_PWTYPE_MAX)
876 goto err;
877
878 genl_lock();
879 ret = -EBUSY;
880 if (l2tp_nl_cmd_ops[pw_type])
881 goto out;
882
883 l2tp_nl_cmd_ops[pw_type] = ops;
884 ret = 0;
885
886out:
887 genl_unlock();
888err:
889 return ret;
890}
891EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
892
893void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
894{
895 if (pw_type < __L2TP_PWTYPE_MAX) {
896 genl_lock();
897 l2tp_nl_cmd_ops[pw_type] = NULL;
898 genl_unlock();
899 }
900}
901EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
902
903static int l2tp_nl_init(void)
904{
905 int err;
906
907 pr_info("L2TP netlink interface\n");
908 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
909 ARRAY_SIZE(l2tp_nl_ops));
910
911 return err;
912}
913
914static void l2tp_nl_cleanup(void)
915{
916 genl_unregister_family(&l2tp_nl_family);
917}
918
919module_init(l2tp_nl_init);
920module_exit(l2tp_nl_cleanup);
921
922MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
923MODULE_DESCRIPTION("L2TP netlink");
924MODULE_LICENSE("GPL");
925MODULE_VERSION("1.0");
926MODULE_ALIAS_GENL_FAMILY("l2tp");