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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_tunnel_get_session(tunnel, session_id);
65 l2tp_tunnel_dec_refcount(tunnel);
66 }
67 }
68
69 return session;
70}
71
72static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
73{
74 struct sk_buff *msg;
75 void *hdr;
76 int ret = -ENOBUFS;
77
78 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
79 if (!msg) {
80 ret = -ENOMEM;
81 goto out;
82 }
83
84 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
85 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
86 if (!hdr) {
87 ret = -EMSGSIZE;
88 goto err_out;
89 }
90
91 genlmsg_end(msg, hdr);
92
93 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
94
95err_out:
96 nlmsg_free(msg);
97
98out:
99 return ret;
100}
101
102static int l2tp_tunnel_notify(struct genl_family *family,
103 struct genl_info *info,
104 struct l2tp_tunnel *tunnel,
105 u8 cmd)
106{
107 struct sk_buff *msg;
108 int ret;
109
110 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
111 if (!msg)
112 return -ENOMEM;
113
114 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
115 NLM_F_ACK, tunnel, cmd);
116
117 if (ret >= 0) {
118 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
119 /* We don't care if no one is listening */
120 if (ret == -ESRCH)
121 ret = 0;
122 return ret;
123 }
124
125 nlmsg_free(msg);
126
127 return ret;
128}
129
130static int l2tp_session_notify(struct genl_family *family,
131 struct genl_info *info,
132 struct l2tp_session *session,
133 u8 cmd)
134{
135 struct sk_buff *msg;
136 int ret;
137
138 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
139 if (!msg)
140 return -ENOMEM;
141
142 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
143 NLM_F_ACK, session, cmd);
144
145 if (ret >= 0) {
146 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
147 /* We don't care if no one is listening */
148 if (ret == -ESRCH)
149 ret = 0;
150 return ret;
151 }
152
153 nlmsg_free(msg);
154
155 return ret;
156}
157
158static int l2tp_nl_cmd_tunnel_create_get_addr(struct nlattr **attrs, struct l2tp_tunnel_cfg *cfg)
159{
160 if (attrs[L2TP_ATTR_UDP_SPORT])
161 cfg->local_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_SPORT]);
162 if (attrs[L2TP_ATTR_UDP_DPORT])
163 cfg->peer_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_DPORT]);
164 cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
165
166 /* Must have either AF_INET or AF_INET6 address for source and destination */
167#if IS_ENABLED(CONFIG_IPV6)
168 if (attrs[L2TP_ATTR_IP6_SADDR] && attrs[L2TP_ATTR_IP6_DADDR]) {
169 cfg->local_ip6 = nla_data(attrs[L2TP_ATTR_IP6_SADDR]);
170 cfg->peer_ip6 = nla_data(attrs[L2TP_ATTR_IP6_DADDR]);
171 cfg->udp6_zero_tx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
172 cfg->udp6_zero_rx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
173 return 0;
174 }
175#endif
176 if (attrs[L2TP_ATTR_IP_SADDR] && attrs[L2TP_ATTR_IP_DADDR]) {
177 cfg->local_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_SADDR]);
178 cfg->peer_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_DADDR]);
179 return 0;
180 }
181 return -EINVAL;
182}
183
184static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
185{
186 u32 tunnel_id;
187 u32 peer_tunnel_id;
188 int proto_version;
189 int fd = -1;
190 int ret = 0;
191 struct l2tp_tunnel_cfg cfg = { 0, };
192 struct l2tp_tunnel *tunnel;
193 struct net *net = genl_info_net(info);
194 struct nlattr **attrs = info->attrs;
195
196 if (!attrs[L2TP_ATTR_CONN_ID]) {
197 ret = -EINVAL;
198 goto out;
199 }
200 tunnel_id = nla_get_u32(attrs[L2TP_ATTR_CONN_ID]);
201
202 if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
203 ret = -EINVAL;
204 goto out;
205 }
206 peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
207
208 if (!attrs[L2TP_ATTR_PROTO_VERSION]) {
209 ret = -EINVAL;
210 goto out;
211 }
212 proto_version = nla_get_u8(attrs[L2TP_ATTR_PROTO_VERSION]);
213
214 if (!attrs[L2TP_ATTR_ENCAP_TYPE]) {
215 ret = -EINVAL;
216 goto out;
217 }
218 cfg.encap = nla_get_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
219
220 /* Managed tunnels take the tunnel socket from userspace.
221 * Unmanaged tunnels must call out the source and destination addresses
222 * for the kernel to create the tunnel socket itself.
223 */
224 if (attrs[L2TP_ATTR_FD]) {
225 fd = nla_get_u32(attrs[L2TP_ATTR_FD]);
226 } else {
227 ret = l2tp_nl_cmd_tunnel_create_get_addr(attrs, &cfg);
228 if (ret < 0)
229 goto out;
230 }
231
232 ret = -EINVAL;
233 switch (cfg.encap) {
234 case L2TP_ENCAPTYPE_UDP:
235 case L2TP_ENCAPTYPE_IP:
236 ret = l2tp_tunnel_create(fd, proto_version, tunnel_id,
237 peer_tunnel_id, &cfg, &tunnel);
238 break;
239 }
240
241 if (ret < 0)
242 goto out;
243
244 l2tp_tunnel_inc_refcount(tunnel);
245 ret = l2tp_tunnel_register(tunnel, net, &cfg);
246 if (ret < 0) {
247 kfree(tunnel);
248 goto out;
249 }
250 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
251 L2TP_CMD_TUNNEL_CREATE);
252 l2tp_tunnel_dec_refcount(tunnel);
253
254out:
255 return ret;
256}
257
258static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
259{
260 struct l2tp_tunnel *tunnel;
261 u32 tunnel_id;
262 int ret = 0;
263 struct net *net = genl_info_net(info);
264
265 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
266 ret = -EINVAL;
267 goto out;
268 }
269 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
270
271 tunnel = l2tp_tunnel_get(net, tunnel_id);
272 if (!tunnel) {
273 ret = -ENODEV;
274 goto out;
275 }
276
277 l2tp_tunnel_notify(&l2tp_nl_family, info,
278 tunnel, L2TP_CMD_TUNNEL_DELETE);
279
280 l2tp_tunnel_delete(tunnel);
281
282 l2tp_tunnel_dec_refcount(tunnel);
283
284out:
285 return ret;
286}
287
288static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
289{
290 struct l2tp_tunnel *tunnel;
291 u32 tunnel_id;
292 int ret = 0;
293 struct net *net = genl_info_net(info);
294
295 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
296 ret = -EINVAL;
297 goto out;
298 }
299 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
300
301 tunnel = l2tp_tunnel_get(net, tunnel_id);
302 if (!tunnel) {
303 ret = -ENODEV;
304 goto out;
305 }
306
307 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
308 tunnel, L2TP_CMD_TUNNEL_MODIFY);
309
310 l2tp_tunnel_dec_refcount(tunnel);
311
312out:
313 return ret;
314}
315
316#if IS_ENABLED(CONFIG_IPV6)
317static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
318 enum l2tp_encap_type encap)
319{
320 struct inet_sock *inet = inet_sk(sk);
321 struct ipv6_pinfo *np = inet6_sk(sk);
322
323 switch (encap) {
324 case L2TP_ENCAPTYPE_UDP:
325 if (udp_get_no_check6_tx(sk) &&
326 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
327 return -1;
328 if (udp_get_no_check6_rx(sk) &&
329 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
330 return -1;
331 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
332 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
333 return -1;
334 fallthrough;
335 case L2TP_ENCAPTYPE_IP:
336 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
337 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr))
338 return -1;
339 break;
340 }
341 return 0;
342}
343#endif
344
345static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
346 enum l2tp_encap_type encap)
347{
348 struct inet_sock *inet = inet_sk(sk);
349
350 switch (encap) {
351 case L2TP_ENCAPTYPE_UDP:
352 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
353 nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
354 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
355 return -1;
356 fallthrough;
357 case L2TP_ENCAPTYPE_IP:
358 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
359 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
360 return -1;
361 break;
362 }
363
364 return 0;
365}
366
367/* Append attributes for the tunnel address, handling the different attribute types
368 * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
369 */
370static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel *tunnel)
371{
372 struct sock *sk = tunnel->sock;
373
374 if (!sk)
375 return 0;
376
377#if IS_ENABLED(CONFIG_IPV6)
378 if (sk->sk_family == AF_INET6)
379 return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
380#endif
381 return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
382}
383
384static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
385 struct l2tp_tunnel *tunnel, u8 cmd)
386{
387 void *hdr;
388 struct nlattr *nest;
389
390 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
391 if (!hdr)
392 return -EMSGSIZE;
393
394 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
395 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
396 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
397 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
398 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
399 goto nla_put_failure;
400
401 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
402 if (!nest)
403 goto nla_put_failure;
404
405 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
406 atomic_long_read(&tunnel->stats.tx_packets),
407 L2TP_ATTR_STATS_PAD) ||
408 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
409 atomic_long_read(&tunnel->stats.tx_bytes),
410 L2TP_ATTR_STATS_PAD) ||
411 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
412 atomic_long_read(&tunnel->stats.tx_errors),
413 L2TP_ATTR_STATS_PAD) ||
414 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
415 atomic_long_read(&tunnel->stats.rx_packets),
416 L2TP_ATTR_STATS_PAD) ||
417 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
418 atomic_long_read(&tunnel->stats.rx_bytes),
419 L2TP_ATTR_STATS_PAD) ||
420 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
421 atomic_long_read(&tunnel->stats.rx_seq_discards),
422 L2TP_ATTR_STATS_PAD) ||
423 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
424 atomic_long_read(&tunnel->stats.rx_cookie_discards),
425 L2TP_ATTR_STATS_PAD) ||
426 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
427 atomic_long_read(&tunnel->stats.rx_oos_packets),
428 L2TP_ATTR_STATS_PAD) ||
429 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
430 atomic_long_read(&tunnel->stats.rx_errors),
431 L2TP_ATTR_STATS_PAD) ||
432 nla_put_u64_64bit(skb, L2TP_ATTR_RX_INVALID,
433 atomic_long_read(&tunnel->stats.rx_invalid),
434 L2TP_ATTR_STATS_PAD))
435 goto nla_put_failure;
436 nla_nest_end(skb, nest);
437
438 if (l2tp_nl_tunnel_send_addr(skb, tunnel))
439 goto nla_put_failure;
440
441 genlmsg_end(skb, hdr);
442 return 0;
443
444nla_put_failure:
445 genlmsg_cancel(skb, hdr);
446 return -1;
447}
448
449static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
450{
451 struct l2tp_tunnel *tunnel;
452 struct sk_buff *msg;
453 u32 tunnel_id;
454 int ret = -ENOBUFS;
455 struct net *net = genl_info_net(info);
456
457 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
458 ret = -EINVAL;
459 goto err;
460 }
461
462 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
463
464 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
465 if (!msg) {
466 ret = -ENOMEM;
467 goto err;
468 }
469
470 tunnel = l2tp_tunnel_get(net, tunnel_id);
471 if (!tunnel) {
472 ret = -ENODEV;
473 goto err_nlmsg;
474 }
475
476 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
477 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
478 if (ret < 0)
479 goto err_nlmsg_tunnel;
480
481 l2tp_tunnel_dec_refcount(tunnel);
482
483 return genlmsg_unicast(net, msg, info->snd_portid);
484
485err_nlmsg_tunnel:
486 l2tp_tunnel_dec_refcount(tunnel);
487err_nlmsg:
488 nlmsg_free(msg);
489err:
490 return ret;
491}
492
493static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
494{
495 int ti = cb->args[0];
496 struct l2tp_tunnel *tunnel;
497 struct net *net = sock_net(skb->sk);
498
499 for (;;) {
500 tunnel = l2tp_tunnel_get_nth(net, ti);
501 if (!tunnel)
502 goto out;
503
504 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
505 cb->nlh->nlmsg_seq, NLM_F_MULTI,
506 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
507 l2tp_tunnel_dec_refcount(tunnel);
508 goto out;
509 }
510 l2tp_tunnel_dec_refcount(tunnel);
511
512 ti++;
513 }
514
515out:
516 cb->args[0] = ti;
517
518 return skb->len;
519}
520
521static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
522{
523 u32 tunnel_id = 0;
524 u32 session_id;
525 u32 peer_session_id;
526 int ret = 0;
527 struct l2tp_tunnel *tunnel;
528 struct l2tp_session *session;
529 struct l2tp_session_cfg cfg = { 0, };
530 struct net *net = genl_info_net(info);
531
532 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
533 ret = -EINVAL;
534 goto out;
535 }
536
537 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
538 tunnel = l2tp_tunnel_get(net, tunnel_id);
539 if (!tunnel) {
540 ret = -ENODEV;
541 goto out;
542 }
543
544 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
545 ret = -EINVAL;
546 goto out_tunnel;
547 }
548 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
549
550 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
551 ret = -EINVAL;
552 goto out_tunnel;
553 }
554 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
555
556 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
557 ret = -EINVAL;
558 goto out_tunnel;
559 }
560 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
561 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
562 ret = -EINVAL;
563 goto out_tunnel;
564 }
565
566 /* L2TPv2 only accepts PPP pseudo-wires */
567 if (tunnel->version == 2 && cfg.pw_type != L2TP_PWTYPE_PPP) {
568 ret = -EPROTONOSUPPORT;
569 goto out_tunnel;
570 }
571
572 if (tunnel->version > 2) {
573 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
574 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
575 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
576 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
577 ret = -EINVAL;
578 goto out_tunnel;
579 }
580 } else {
581 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
582 }
583
584 if (info->attrs[L2TP_ATTR_COOKIE]) {
585 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
586
587 if (len > 8) {
588 ret = -EINVAL;
589 goto out_tunnel;
590 }
591 cfg.cookie_len = len;
592 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
593 }
594 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
595 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
596
597 if (len > 8) {
598 ret = -EINVAL;
599 goto out_tunnel;
600 }
601 cfg.peer_cookie_len = len;
602 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
603 }
604 if (info->attrs[L2TP_ATTR_IFNAME])
605 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
606 }
607
608 if (info->attrs[L2TP_ATTR_RECV_SEQ])
609 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
610
611 if (info->attrs[L2TP_ATTR_SEND_SEQ])
612 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
613
614 if (info->attrs[L2TP_ATTR_LNS_MODE])
615 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
616
617 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
618 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
619
620#ifdef CONFIG_MODULES
621 if (!l2tp_nl_cmd_ops[cfg.pw_type]) {
622 genl_unlock();
623 request_module("net-l2tp-type-%u", cfg.pw_type);
624 genl_lock();
625 }
626#endif
627 if (!l2tp_nl_cmd_ops[cfg.pw_type] || !l2tp_nl_cmd_ops[cfg.pw_type]->session_create) {
628 ret = -EPROTONOSUPPORT;
629 goto out_tunnel;
630 }
631
632 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
633 session_id,
634 peer_session_id,
635 &cfg);
636
637 if (ret >= 0) {
638 session = l2tp_tunnel_get_session(tunnel, session_id);
639 if (session) {
640 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
641 L2TP_CMD_SESSION_CREATE);
642 l2tp_session_dec_refcount(session);
643 }
644 }
645
646out_tunnel:
647 l2tp_tunnel_dec_refcount(tunnel);
648out:
649 return ret;
650}
651
652static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
653{
654 int ret = 0;
655 struct l2tp_session *session;
656 u16 pw_type;
657
658 session = l2tp_nl_session_get(info);
659 if (!session) {
660 ret = -ENODEV;
661 goto out;
662 }
663
664 l2tp_session_notify(&l2tp_nl_family, info,
665 session, L2TP_CMD_SESSION_DELETE);
666
667 pw_type = session->pwtype;
668 if (pw_type < __L2TP_PWTYPE_MAX)
669 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
670 l2tp_nl_cmd_ops[pw_type]->session_delete(session);
671
672 l2tp_session_dec_refcount(session);
673
674out:
675 return ret;
676}
677
678static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
679{
680 int ret = 0;
681 struct l2tp_session *session;
682
683 session = l2tp_nl_session_get(info);
684 if (!session) {
685 ret = -ENODEV;
686 goto out;
687 }
688
689 if (info->attrs[L2TP_ATTR_RECV_SEQ])
690 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
691
692 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
693 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
694 l2tp_session_set_header_len(session, session->tunnel->version);
695 }
696
697 if (info->attrs[L2TP_ATTR_LNS_MODE])
698 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
699
700 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
701 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
702
703 ret = l2tp_session_notify(&l2tp_nl_family, info,
704 session, L2TP_CMD_SESSION_MODIFY);
705
706 l2tp_session_dec_refcount(session);
707
708out:
709 return ret;
710}
711
712static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
713 struct l2tp_session *session, u8 cmd)
714{
715 void *hdr;
716 struct nlattr *nest;
717 struct l2tp_tunnel *tunnel = session->tunnel;
718
719 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
720 if (!hdr)
721 return -EMSGSIZE;
722
723 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
724 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
725 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
726 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) ||
727 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
728 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype))
729 goto nla_put_failure;
730
731 if ((session->ifname[0] &&
732 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
733 (session->cookie_len &&
734 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, session->cookie)) ||
735 (session->peer_cookie_len &&
736 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, session->peer_cookie)) ||
737 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
738 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
739 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
740 (l2tp_tunnel_uses_xfrm(tunnel) &&
741 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
742 (session->reorder_timeout &&
743 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
744 session->reorder_timeout, L2TP_ATTR_PAD)))
745 goto nla_put_failure;
746
747 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
748 if (!nest)
749 goto nla_put_failure;
750
751 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
752 atomic_long_read(&session->stats.tx_packets),
753 L2TP_ATTR_STATS_PAD) ||
754 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
755 atomic_long_read(&session->stats.tx_bytes),
756 L2TP_ATTR_STATS_PAD) ||
757 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
758 atomic_long_read(&session->stats.tx_errors),
759 L2TP_ATTR_STATS_PAD) ||
760 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
761 atomic_long_read(&session->stats.rx_packets),
762 L2TP_ATTR_STATS_PAD) ||
763 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
764 atomic_long_read(&session->stats.rx_bytes),
765 L2TP_ATTR_STATS_PAD) ||
766 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
767 atomic_long_read(&session->stats.rx_seq_discards),
768 L2TP_ATTR_STATS_PAD) ||
769 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
770 atomic_long_read(&session->stats.rx_cookie_discards),
771 L2TP_ATTR_STATS_PAD) ||
772 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
773 atomic_long_read(&session->stats.rx_oos_packets),
774 L2TP_ATTR_STATS_PAD) ||
775 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
776 atomic_long_read(&session->stats.rx_errors),
777 L2TP_ATTR_STATS_PAD) ||
778 nla_put_u64_64bit(skb, L2TP_ATTR_RX_INVALID,
779 atomic_long_read(&session->stats.rx_invalid),
780 L2TP_ATTR_STATS_PAD))
781 goto nla_put_failure;
782 nla_nest_end(skb, nest);
783
784 genlmsg_end(skb, hdr);
785 return 0;
786
787 nla_put_failure:
788 genlmsg_cancel(skb, hdr);
789 return -1;
790}
791
792static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
793{
794 struct l2tp_session *session;
795 struct sk_buff *msg;
796 int ret;
797
798 session = l2tp_nl_session_get(info);
799 if (!session) {
800 ret = -ENODEV;
801 goto err;
802 }
803
804 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
805 if (!msg) {
806 ret = -ENOMEM;
807 goto err_ref;
808 }
809
810 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
811 0, session, L2TP_CMD_SESSION_GET);
812 if (ret < 0)
813 goto err_ref_msg;
814
815 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
816
817 l2tp_session_dec_refcount(session);
818
819 return ret;
820
821err_ref_msg:
822 nlmsg_free(msg);
823err_ref:
824 l2tp_session_dec_refcount(session);
825err:
826 return ret;
827}
828
829static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
830{
831 struct net *net = sock_net(skb->sk);
832 struct l2tp_session *session;
833 struct l2tp_tunnel *tunnel = NULL;
834 int ti = cb->args[0];
835 int si = cb->args[1];
836
837 for (;;) {
838 if (!tunnel) {
839 tunnel = l2tp_tunnel_get_nth(net, ti);
840 if (!tunnel)
841 goto out;
842 }
843
844 session = l2tp_session_get_nth(tunnel, si);
845 if (!session) {
846 ti++;
847 l2tp_tunnel_dec_refcount(tunnel);
848 tunnel = NULL;
849 si = 0;
850 continue;
851 }
852
853 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
854 cb->nlh->nlmsg_seq, NLM_F_MULTI,
855 session, L2TP_CMD_SESSION_GET) < 0) {
856 l2tp_session_dec_refcount(session);
857 l2tp_tunnel_dec_refcount(tunnel);
858 break;
859 }
860 l2tp_session_dec_refcount(session);
861
862 si++;
863 }
864
865out:
866 cb->args[0] = ti;
867 cb->args[1] = si;
868
869 return skb->len;
870}
871
872static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
873 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
874 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
875 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
876 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
877 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
878 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
879 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
880 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
881 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
882 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
883 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
884 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
885 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
886 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
887 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
888 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
889 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
890 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
891 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
892 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
893 [L2TP_ATTR_FD] = { .type = NLA_U32, },
894 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
895 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
896 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
897 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
898 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
899 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
900 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
901 [L2TP_ATTR_IP6_SADDR] = {
902 .type = NLA_BINARY,
903 .len = sizeof(struct in6_addr),
904 },
905 [L2TP_ATTR_IP6_DADDR] = {
906 .type = NLA_BINARY,
907 .len = sizeof(struct in6_addr),
908 },
909 [L2TP_ATTR_IFNAME] = {
910 .type = NLA_NUL_STRING,
911 .len = IFNAMSIZ - 1,
912 },
913 [L2TP_ATTR_COOKIE] = {
914 .type = NLA_BINARY,
915 .len = 8,
916 },
917 [L2TP_ATTR_PEER_COOKIE] = {
918 .type = NLA_BINARY,
919 .len = 8,
920 },
921};
922
923static const struct genl_small_ops l2tp_nl_ops[] = {
924 {
925 .cmd = L2TP_CMD_NOOP,
926 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
927 .doit = l2tp_nl_cmd_noop,
928 /* can be retrieved by unprivileged users */
929 },
930 {
931 .cmd = L2TP_CMD_TUNNEL_CREATE,
932 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
933 .doit = l2tp_nl_cmd_tunnel_create,
934 .flags = GENL_UNS_ADMIN_PERM,
935 },
936 {
937 .cmd = L2TP_CMD_TUNNEL_DELETE,
938 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
939 .doit = l2tp_nl_cmd_tunnel_delete,
940 .flags = GENL_UNS_ADMIN_PERM,
941 },
942 {
943 .cmd = L2TP_CMD_TUNNEL_MODIFY,
944 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
945 .doit = l2tp_nl_cmd_tunnel_modify,
946 .flags = GENL_UNS_ADMIN_PERM,
947 },
948 {
949 .cmd = L2TP_CMD_TUNNEL_GET,
950 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
951 .doit = l2tp_nl_cmd_tunnel_get,
952 .dumpit = l2tp_nl_cmd_tunnel_dump,
953 .flags = GENL_UNS_ADMIN_PERM,
954 },
955 {
956 .cmd = L2TP_CMD_SESSION_CREATE,
957 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
958 .doit = l2tp_nl_cmd_session_create,
959 .flags = GENL_UNS_ADMIN_PERM,
960 },
961 {
962 .cmd = L2TP_CMD_SESSION_DELETE,
963 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
964 .doit = l2tp_nl_cmd_session_delete,
965 .flags = GENL_UNS_ADMIN_PERM,
966 },
967 {
968 .cmd = L2TP_CMD_SESSION_MODIFY,
969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
970 .doit = l2tp_nl_cmd_session_modify,
971 .flags = GENL_UNS_ADMIN_PERM,
972 },
973 {
974 .cmd = L2TP_CMD_SESSION_GET,
975 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
976 .doit = l2tp_nl_cmd_session_get,
977 .dumpit = l2tp_nl_cmd_session_dump,
978 .flags = GENL_UNS_ADMIN_PERM,
979 },
980};
981
982static struct genl_family l2tp_nl_family __ro_after_init = {
983 .name = L2TP_GENL_NAME,
984 .version = L2TP_GENL_VERSION,
985 .hdrsize = 0,
986 .maxattr = L2TP_ATTR_MAX,
987 .policy = l2tp_nl_policy,
988 .netnsok = true,
989 .module = THIS_MODULE,
990 .small_ops = l2tp_nl_ops,
991 .n_small_ops = ARRAY_SIZE(l2tp_nl_ops),
992 .resv_start_op = L2TP_CMD_SESSION_GET + 1,
993 .mcgrps = l2tp_multicast_group,
994 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
995};
996
997int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
998{
999 int ret;
1000
1001 ret = -EINVAL;
1002 if (pw_type >= __L2TP_PWTYPE_MAX)
1003 goto err;
1004
1005 genl_lock();
1006 ret = -EBUSY;
1007 if (l2tp_nl_cmd_ops[pw_type])
1008 goto out;
1009
1010 l2tp_nl_cmd_ops[pw_type] = ops;
1011 ret = 0;
1012
1013out:
1014 genl_unlock();
1015err:
1016 return ret;
1017}
1018EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1019
1020void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1021{
1022 if (pw_type < __L2TP_PWTYPE_MAX) {
1023 genl_lock();
1024 l2tp_nl_cmd_ops[pw_type] = NULL;
1025 genl_unlock();
1026 }
1027}
1028EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1029
1030static int __init l2tp_nl_init(void)
1031{
1032 pr_info("L2TP netlink interface\n");
1033 return genl_register_family(&l2tp_nl_family);
1034}
1035
1036static void l2tp_nl_cleanup(void)
1037{
1038 genl_unregister_family(&l2tp_nl_family);
1039}
1040
1041module_init(l2tp_nl_init);
1042module_exit(l2tp_nl_cleanup);
1043
1044MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1045MODULE_DESCRIPTION("L2TP netlink");
1046MODULE_LICENSE("GPL");
1047MODULE_VERSION("1.0");
1048MODULE_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#include <net/sock.h>
18#include <net/genetlink.h>
19#include <net/udp.h>
20#include <linux/in.h>
21#include <linux/udp.h>
22#include <linux/socket.h>
23#include <linux/module.h>
24#include <linux/list.h>
25#include <net/net_namespace.h>
26
27#include <linux/l2tp.h>
28
29#include "l2tp_core.h"
30
31
32static struct genl_family l2tp_nl_family = {
33 .id = GENL_ID_GENERATE,
34 .name = L2TP_GENL_NAME,
35 .version = L2TP_GENL_VERSION,
36 .hdrsize = 0,
37 .maxattr = L2TP_ATTR_MAX,
38};
39
40/* Accessed under genl lock */
41static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
42
43static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
44{
45 u32 tunnel_id;
46 u32 session_id;
47 char *ifname;
48 struct l2tp_tunnel *tunnel;
49 struct l2tp_session *session = NULL;
50 struct net *net = genl_info_net(info);
51
52 if (info->attrs[L2TP_ATTR_IFNAME]) {
53 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
54 session = l2tp_session_find_by_ifname(net, ifname);
55 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
56 (info->attrs[L2TP_ATTR_CONN_ID])) {
57 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
58 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
59 tunnel = l2tp_tunnel_find(net, tunnel_id);
60 if (tunnel)
61 session = l2tp_session_find(net, tunnel, session_id);
62 }
63
64 return session;
65}
66
67static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
68{
69 struct sk_buff *msg;
70 void *hdr;
71 int ret = -ENOBUFS;
72
73 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
74 if (!msg) {
75 ret = -ENOMEM;
76 goto out;
77 }
78
79 hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
80 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
81 if (IS_ERR(hdr)) {
82 ret = PTR_ERR(hdr);
83 goto err_out;
84 }
85
86 genlmsg_end(msg, hdr);
87
88 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
89
90err_out:
91 nlmsg_free(msg);
92
93out:
94 return ret;
95}
96
97static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
98{
99 u32 tunnel_id;
100 u32 peer_tunnel_id;
101 int proto_version;
102 int fd;
103 int ret = 0;
104 struct l2tp_tunnel_cfg cfg = { 0, };
105 struct l2tp_tunnel *tunnel;
106 struct net *net = genl_info_net(info);
107
108 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
109 ret = -EINVAL;
110 goto out;
111 }
112 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
113
114 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
115 ret = -EINVAL;
116 goto out;
117 }
118 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
119
120 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
121 ret = -EINVAL;
122 goto out;
123 }
124 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
125
126 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
127 ret = -EINVAL;
128 goto out;
129 }
130 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
131
132 fd = -1;
133 if (info->attrs[L2TP_ATTR_FD]) {
134 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
135 } else {
136 if (info->attrs[L2TP_ATTR_IP_SADDR])
137 cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]);
138 if (info->attrs[L2TP_ATTR_IP_DADDR])
139 cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]);
140 if (info->attrs[L2TP_ATTR_UDP_SPORT])
141 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
142 if (info->attrs[L2TP_ATTR_UDP_DPORT])
143 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
144 if (info->attrs[L2TP_ATTR_UDP_CSUM])
145 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
146 }
147
148 if (info->attrs[L2TP_ATTR_DEBUG])
149 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
150
151 tunnel = l2tp_tunnel_find(net, tunnel_id);
152 if (tunnel != NULL) {
153 ret = -EEXIST;
154 goto out;
155 }
156
157 ret = -EINVAL;
158 switch (cfg.encap) {
159 case L2TP_ENCAPTYPE_UDP:
160 case L2TP_ENCAPTYPE_IP:
161 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
162 peer_tunnel_id, &cfg, &tunnel);
163 break;
164 }
165
166out:
167 return ret;
168}
169
170static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
171{
172 struct l2tp_tunnel *tunnel;
173 u32 tunnel_id;
174 int ret = 0;
175 struct net *net = genl_info_net(info);
176
177 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
178 ret = -EINVAL;
179 goto out;
180 }
181 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
182
183 tunnel = l2tp_tunnel_find(net, tunnel_id);
184 if (tunnel == NULL) {
185 ret = -ENODEV;
186 goto out;
187 }
188
189 (void) l2tp_tunnel_delete(tunnel);
190
191out:
192 return ret;
193}
194
195static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
196{
197 struct l2tp_tunnel *tunnel;
198 u32 tunnel_id;
199 int ret = 0;
200 struct net *net = genl_info_net(info);
201
202 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
203 ret = -EINVAL;
204 goto out;
205 }
206 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
207
208 tunnel = l2tp_tunnel_find(net, tunnel_id);
209 if (tunnel == NULL) {
210 ret = -ENODEV;
211 goto out;
212 }
213
214 if (info->attrs[L2TP_ATTR_DEBUG])
215 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
216
217out:
218 return ret;
219}
220
221static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
222 struct l2tp_tunnel *tunnel)
223{
224 void *hdr;
225 struct nlattr *nest;
226 struct sock *sk = NULL;
227 struct inet_sock *inet;
228
229 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
230 L2TP_CMD_TUNNEL_GET);
231 if (IS_ERR(hdr))
232 return PTR_ERR(hdr);
233
234 NLA_PUT_U8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version);
235 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
236 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
237 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, tunnel->debug);
238 NLA_PUT_U16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap);
239
240 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
241 if (nest == NULL)
242 goto nla_put_failure;
243
244 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets);
245 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes);
246 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors);
247 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets);
248 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes);
249 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, tunnel->stats.rx_seq_discards);
250 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, tunnel->stats.rx_oos_packets);
251 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors);
252 nla_nest_end(skb, nest);
253
254 sk = tunnel->sock;
255 if (!sk)
256 goto out;
257
258 inet = inet_sk(sk);
259
260 switch (tunnel->encap) {
261 case L2TP_ENCAPTYPE_UDP:
262 NLA_PUT_U16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport));
263 NLA_PUT_U16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport));
264 NLA_PUT_U8(skb, L2TP_ATTR_UDP_CSUM, (sk->sk_no_check != UDP_CSUM_NOXMIT));
265 /* NOBREAK */
266 case L2TP_ENCAPTYPE_IP:
267 NLA_PUT_BE32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr);
268 NLA_PUT_BE32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr);
269 break;
270 }
271
272out:
273 return genlmsg_end(skb, hdr);
274
275nla_put_failure:
276 genlmsg_cancel(skb, hdr);
277 return -1;
278}
279
280static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
281{
282 struct l2tp_tunnel *tunnel;
283 struct sk_buff *msg;
284 u32 tunnel_id;
285 int ret = -ENOBUFS;
286 struct net *net = genl_info_net(info);
287
288 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
289 ret = -EINVAL;
290 goto out;
291 }
292
293 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
294
295 tunnel = l2tp_tunnel_find(net, tunnel_id);
296 if (tunnel == NULL) {
297 ret = -ENODEV;
298 goto out;
299 }
300
301 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
302 if (!msg) {
303 ret = -ENOMEM;
304 goto out;
305 }
306
307 ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
308 NLM_F_ACK, tunnel);
309 if (ret < 0)
310 goto err_out;
311
312 return genlmsg_unicast(net, msg, info->snd_pid);
313
314err_out:
315 nlmsg_free(msg);
316
317out:
318 return ret;
319}
320
321static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
322{
323 int ti = cb->args[0];
324 struct l2tp_tunnel *tunnel;
325 struct net *net = sock_net(skb->sk);
326
327 for (;;) {
328 tunnel = l2tp_tunnel_find_nth(net, ti);
329 if (tunnel == NULL)
330 goto out;
331
332 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
333 cb->nlh->nlmsg_seq, NLM_F_MULTI,
334 tunnel) <= 0)
335 goto out;
336
337 ti++;
338 }
339
340out:
341 cb->args[0] = ti;
342
343 return skb->len;
344}
345
346static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
347{
348 u32 tunnel_id = 0;
349 u32 session_id;
350 u32 peer_session_id;
351 int ret = 0;
352 struct l2tp_tunnel *tunnel;
353 struct l2tp_session *session;
354 struct l2tp_session_cfg cfg = { 0, };
355 struct net *net = genl_info_net(info);
356
357 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
358 ret = -EINVAL;
359 goto out;
360 }
361 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
362 tunnel = l2tp_tunnel_find(net, tunnel_id);
363 if (!tunnel) {
364 ret = -ENODEV;
365 goto out;
366 }
367
368 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
369 ret = -EINVAL;
370 goto out;
371 }
372 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
373 session = l2tp_session_find(net, tunnel, session_id);
374 if (session) {
375 ret = -EEXIST;
376 goto out;
377 }
378
379 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
380 ret = -EINVAL;
381 goto out;
382 }
383 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
384
385 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
386 ret = -EINVAL;
387 goto out;
388 }
389 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
390 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
391 ret = -EINVAL;
392 goto out;
393 }
394
395 if (tunnel->version > 2) {
396 if (info->attrs[L2TP_ATTR_OFFSET])
397 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
398
399 if (info->attrs[L2TP_ATTR_DATA_SEQ])
400 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
401
402 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
403 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
404 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
405
406 cfg.l2specific_len = 4;
407 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
408 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
409
410 if (info->attrs[L2TP_ATTR_COOKIE]) {
411 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
412 if (len > 8) {
413 ret = -EINVAL;
414 goto out;
415 }
416 cfg.cookie_len = len;
417 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
418 }
419 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
420 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
421 if (len > 8) {
422 ret = -EINVAL;
423 goto out;
424 }
425 cfg.peer_cookie_len = len;
426 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
427 }
428 if (info->attrs[L2TP_ATTR_IFNAME])
429 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
430
431 if (info->attrs[L2TP_ATTR_VLAN_ID])
432 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
433 }
434
435 if (info->attrs[L2TP_ATTR_DEBUG])
436 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
437
438 if (info->attrs[L2TP_ATTR_RECV_SEQ])
439 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
440
441 if (info->attrs[L2TP_ATTR_SEND_SEQ])
442 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
443
444 if (info->attrs[L2TP_ATTR_LNS_MODE])
445 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
446
447 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
448 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
449
450 if (info->attrs[L2TP_ATTR_MTU])
451 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
452
453 if (info->attrs[L2TP_ATTR_MRU])
454 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
455
456 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
457 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
458 ret = -EPROTONOSUPPORT;
459 goto out;
460 }
461
462 /* Check that pseudowire-specific params are present */
463 switch (cfg.pw_type) {
464 case L2TP_PWTYPE_NONE:
465 break;
466 case L2TP_PWTYPE_ETH_VLAN:
467 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
468 ret = -EINVAL;
469 goto out;
470 }
471 break;
472 case L2TP_PWTYPE_ETH:
473 break;
474 case L2TP_PWTYPE_PPP:
475 case L2TP_PWTYPE_PPP_AC:
476 break;
477 case L2TP_PWTYPE_IP:
478 default:
479 ret = -EPROTONOSUPPORT;
480 break;
481 }
482
483 ret = -EPROTONOSUPPORT;
484 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
485 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
486 session_id, peer_session_id, &cfg);
487
488out:
489 return ret;
490}
491
492static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
493{
494 int ret = 0;
495 struct l2tp_session *session;
496 u16 pw_type;
497
498 session = l2tp_nl_session_find(info);
499 if (session == NULL) {
500 ret = -ENODEV;
501 goto out;
502 }
503
504 pw_type = session->pwtype;
505 if (pw_type < __L2TP_PWTYPE_MAX)
506 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
507 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
508
509out:
510 return ret;
511}
512
513static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
514{
515 int ret = 0;
516 struct l2tp_session *session;
517
518 session = l2tp_nl_session_find(info);
519 if (session == NULL) {
520 ret = -ENODEV;
521 goto out;
522 }
523
524 if (info->attrs[L2TP_ATTR_DEBUG])
525 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
526
527 if (info->attrs[L2TP_ATTR_DATA_SEQ])
528 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
529
530 if (info->attrs[L2TP_ATTR_RECV_SEQ])
531 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
532
533 if (info->attrs[L2TP_ATTR_SEND_SEQ])
534 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
535
536 if (info->attrs[L2TP_ATTR_LNS_MODE])
537 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
538
539 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
540 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
541
542 if (info->attrs[L2TP_ATTR_MTU])
543 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
544
545 if (info->attrs[L2TP_ATTR_MRU])
546 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
547
548out:
549 return ret;
550}
551
552static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
553 struct l2tp_session *session)
554{
555 void *hdr;
556 struct nlattr *nest;
557 struct l2tp_tunnel *tunnel = session->tunnel;
558 struct sock *sk = NULL;
559
560 sk = tunnel->sock;
561
562 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
563 if (IS_ERR(hdr))
564 return PTR_ERR(hdr);
565
566 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
567 NLA_PUT_U32(skb, L2TP_ATTR_SESSION_ID, session->session_id);
568 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
569 NLA_PUT_U32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
570 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, session->debug);
571 NLA_PUT_U16(skb, L2TP_ATTR_PW_TYPE, session->pwtype);
572 NLA_PUT_U16(skb, L2TP_ATTR_MTU, session->mtu);
573 if (session->mru)
574 NLA_PUT_U16(skb, L2TP_ATTR_MRU, session->mru);
575
576 if (session->ifname && session->ifname[0])
577 NLA_PUT_STRING(skb, L2TP_ATTR_IFNAME, session->ifname);
578 if (session->cookie_len)
579 NLA_PUT(skb, L2TP_ATTR_COOKIE, session->cookie_len, &session->cookie[0]);
580 if (session->peer_cookie_len)
581 NLA_PUT(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, &session->peer_cookie[0]);
582 NLA_PUT_U8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq);
583 NLA_PUT_U8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq);
584 NLA_PUT_U8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode);
585#ifdef CONFIG_XFRM
586 if ((sk) && (sk->sk_policy[0] || sk->sk_policy[1]))
587 NLA_PUT_U8(skb, L2TP_ATTR_USING_IPSEC, 1);
588#endif
589 if (session->reorder_timeout)
590 NLA_PUT_MSECS(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout);
591
592 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
593 if (nest == NULL)
594 goto nla_put_failure;
595 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets);
596 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes);
597 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors);
598 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets);
599 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes);
600 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, session->stats.rx_seq_discards);
601 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, session->stats.rx_oos_packets);
602 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors);
603 nla_nest_end(skb, nest);
604
605 return genlmsg_end(skb, hdr);
606
607 nla_put_failure:
608 genlmsg_cancel(skb, hdr);
609 return -1;
610}
611
612static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
613{
614 struct l2tp_session *session;
615 struct sk_buff *msg;
616 int ret;
617
618 session = l2tp_nl_session_find(info);
619 if (session == NULL) {
620 ret = -ENODEV;
621 goto out;
622 }
623
624 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
625 if (!msg) {
626 ret = -ENOMEM;
627 goto out;
628 }
629
630 ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
631 0, session);
632 if (ret < 0)
633 goto err_out;
634
635 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
636
637err_out:
638 nlmsg_free(msg);
639
640out:
641 return ret;
642}
643
644static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
645{
646 struct net *net = sock_net(skb->sk);
647 struct l2tp_session *session;
648 struct l2tp_tunnel *tunnel = NULL;
649 int ti = cb->args[0];
650 int si = cb->args[1];
651
652 for (;;) {
653 if (tunnel == NULL) {
654 tunnel = l2tp_tunnel_find_nth(net, ti);
655 if (tunnel == NULL)
656 goto out;
657 }
658
659 session = l2tp_session_find_nth(tunnel, si);
660 if (session == NULL) {
661 ti++;
662 tunnel = NULL;
663 si = 0;
664 continue;
665 }
666
667 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
668 cb->nlh->nlmsg_seq, NLM_F_MULTI,
669 session) <= 0)
670 break;
671
672 si++;
673 }
674
675out:
676 cb->args[0] = ti;
677 cb->args[1] = si;
678
679 return skb->len;
680}
681
682static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
683 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
684 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
685 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
686 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
687 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
688 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
689 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
690 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
691 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
692 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
693 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
694 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
695 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
696 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
697 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
698 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
699 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
700 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
701 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
702 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
703 [L2TP_ATTR_FD] = { .type = NLA_U32, },
704 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
705 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
706 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
707 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
708 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
709 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
710 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
711 [L2TP_ATTR_IFNAME] = {
712 .type = NLA_NUL_STRING,
713 .len = IFNAMSIZ - 1,
714 },
715 [L2TP_ATTR_COOKIE] = {
716 .type = NLA_BINARY,
717 .len = 8,
718 },
719 [L2TP_ATTR_PEER_COOKIE] = {
720 .type = NLA_BINARY,
721 .len = 8,
722 },
723};
724
725static struct genl_ops l2tp_nl_ops[] = {
726 {
727 .cmd = L2TP_CMD_NOOP,
728 .doit = l2tp_nl_cmd_noop,
729 .policy = l2tp_nl_policy,
730 /* can be retrieved by unprivileged users */
731 },
732 {
733 .cmd = L2TP_CMD_TUNNEL_CREATE,
734 .doit = l2tp_nl_cmd_tunnel_create,
735 .policy = l2tp_nl_policy,
736 .flags = GENL_ADMIN_PERM,
737 },
738 {
739 .cmd = L2TP_CMD_TUNNEL_DELETE,
740 .doit = l2tp_nl_cmd_tunnel_delete,
741 .policy = l2tp_nl_policy,
742 .flags = GENL_ADMIN_PERM,
743 },
744 {
745 .cmd = L2TP_CMD_TUNNEL_MODIFY,
746 .doit = l2tp_nl_cmd_tunnel_modify,
747 .policy = l2tp_nl_policy,
748 .flags = GENL_ADMIN_PERM,
749 },
750 {
751 .cmd = L2TP_CMD_TUNNEL_GET,
752 .doit = l2tp_nl_cmd_tunnel_get,
753 .dumpit = l2tp_nl_cmd_tunnel_dump,
754 .policy = l2tp_nl_policy,
755 .flags = GENL_ADMIN_PERM,
756 },
757 {
758 .cmd = L2TP_CMD_SESSION_CREATE,
759 .doit = l2tp_nl_cmd_session_create,
760 .policy = l2tp_nl_policy,
761 .flags = GENL_ADMIN_PERM,
762 },
763 {
764 .cmd = L2TP_CMD_SESSION_DELETE,
765 .doit = l2tp_nl_cmd_session_delete,
766 .policy = l2tp_nl_policy,
767 .flags = GENL_ADMIN_PERM,
768 },
769 {
770 .cmd = L2TP_CMD_SESSION_MODIFY,
771 .doit = l2tp_nl_cmd_session_modify,
772 .policy = l2tp_nl_policy,
773 .flags = GENL_ADMIN_PERM,
774 },
775 {
776 .cmd = L2TP_CMD_SESSION_GET,
777 .doit = l2tp_nl_cmd_session_get,
778 .dumpit = l2tp_nl_cmd_session_dump,
779 .policy = l2tp_nl_policy,
780 .flags = GENL_ADMIN_PERM,
781 },
782};
783
784int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
785{
786 int ret;
787
788 ret = -EINVAL;
789 if (pw_type >= __L2TP_PWTYPE_MAX)
790 goto err;
791
792 genl_lock();
793 ret = -EBUSY;
794 if (l2tp_nl_cmd_ops[pw_type])
795 goto out;
796
797 l2tp_nl_cmd_ops[pw_type] = ops;
798 ret = 0;
799
800out:
801 genl_unlock();
802err:
803 return ret;
804}
805EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
806
807void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
808{
809 if (pw_type < __L2TP_PWTYPE_MAX) {
810 genl_lock();
811 l2tp_nl_cmd_ops[pw_type] = NULL;
812 genl_unlock();
813 }
814}
815EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
816
817static int l2tp_nl_init(void)
818{
819 int err;
820
821 printk(KERN_INFO "L2TP netlink interface\n");
822 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
823 ARRAY_SIZE(l2tp_nl_ops));
824
825 return err;
826}
827
828static void l2tp_nl_cleanup(void)
829{
830 genl_unregister_family(&l2tp_nl_family);
831}
832
833module_init(l2tp_nl_init);
834module_exit(l2tp_nl_cleanup);
835
836MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
837MODULE_DESCRIPTION("L2TP netlink");
838MODULE_LICENSE("GPL");
839MODULE_VERSION("1.0");
840MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
841 __stringify(NETLINK_GENERIC) "-type-" "l2tp");