tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 tunnel = l2tp_tunnel_find(net, tunnel_id);
240 if (tunnel != NULL) {
241 ret = -EEXIST;
242 goto out;
243 }
244
245 ret = -EINVAL;
246 switch (cfg.encap) {
247 case L2TP_ENCAPTYPE_UDP:
248 case L2TP_ENCAPTYPE_IP:
249 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
250 peer_tunnel_id, &cfg, &tunnel);
251 break;
252 }
253
254 if (ret >= 0)
255 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
256 tunnel, L2TP_CMD_TUNNEL_CREATE);
257out:
258 return ret;
259}
260
261static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
262{
263 struct l2tp_tunnel *tunnel;
264 u32 tunnel_id;
265 int ret = 0;
266 struct net *net = genl_info_net(info);
267
268 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
269 ret = -EINVAL;
270 goto out;
271 }
272 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
273
274 tunnel = l2tp_tunnel_get(net, tunnel_id);
275 if (!tunnel) {
276 ret = -ENODEV;
277 goto out;
278 }
279
280 l2tp_tunnel_notify(&l2tp_nl_family, info,
281 tunnel, L2TP_CMD_TUNNEL_DELETE);
282
283 l2tp_tunnel_delete(tunnel);
284
285 l2tp_tunnel_dec_refcount(tunnel);
286
287out:
288 return ret;
289}
290
291static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
292{
293 struct l2tp_tunnel *tunnel;
294 u32 tunnel_id;
295 int ret = 0;
296 struct net *net = genl_info_net(info);
297
298 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
299 ret = -EINVAL;
300 goto out;
301 }
302 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
303
304 tunnel = l2tp_tunnel_get(net, tunnel_id);
305 if (!tunnel) {
306 ret = -ENODEV;
307 goto out;
308 }
309
310 if (info->attrs[L2TP_ATTR_DEBUG])
311 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
312
313 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
314 tunnel, L2TP_CMD_TUNNEL_MODIFY);
315
316 l2tp_tunnel_dec_refcount(tunnel);
317
318out:
319 return ret;
320}
321
322static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
323 struct l2tp_tunnel *tunnel, u8 cmd)
324{
325 void *hdr;
326 struct nlattr *nest;
327 struct sock *sk = NULL;
328 struct inet_sock *inet;
329#if IS_ENABLED(CONFIG_IPV6)
330 struct ipv6_pinfo *np = NULL;
331#endif
332
333 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
334 if (!hdr)
335 return -EMSGSIZE;
336
337 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
338 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
339 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
340 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
341 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
342 goto nla_put_failure;
343
344 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
345 if (nest == NULL)
346 goto nla_put_failure;
347
348 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
349 atomic_long_read(&tunnel->stats.tx_packets),
350 L2TP_ATTR_STATS_PAD) ||
351 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
352 atomic_long_read(&tunnel->stats.tx_bytes),
353 L2TP_ATTR_STATS_PAD) ||
354 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
355 atomic_long_read(&tunnel->stats.tx_errors),
356 L2TP_ATTR_STATS_PAD) ||
357 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
358 atomic_long_read(&tunnel->stats.rx_packets),
359 L2TP_ATTR_STATS_PAD) ||
360 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
361 atomic_long_read(&tunnel->stats.rx_bytes),
362 L2TP_ATTR_STATS_PAD) ||
363 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
364 atomic_long_read(&tunnel->stats.rx_seq_discards),
365 L2TP_ATTR_STATS_PAD) ||
366 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
367 atomic_long_read(&tunnel->stats.rx_oos_packets),
368 L2TP_ATTR_STATS_PAD) ||
369 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
370 atomic_long_read(&tunnel->stats.rx_errors),
371 L2TP_ATTR_STATS_PAD))
372 goto nla_put_failure;
373 nla_nest_end(skb, nest);
374
375 sk = tunnel->sock;
376 if (!sk)
377 goto out;
378
379#if IS_ENABLED(CONFIG_IPV6)
380 if (sk->sk_family == AF_INET6)
381 np = inet6_sk(sk);
382#endif
383
384 inet = inet_sk(sk);
385
386 switch (tunnel->encap) {
387 case L2TP_ENCAPTYPE_UDP:
388 switch (sk->sk_family) {
389 case AF_INET:
390 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
391 goto nla_put_failure;
392 break;
393#if IS_ENABLED(CONFIG_IPV6)
394 case AF_INET6:
395 if (udp_get_no_check6_tx(sk) &&
396 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
397 goto nla_put_failure;
398 if (udp_get_no_check6_rx(sk) &&
399 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
400 goto nla_put_failure;
401 break;
402#endif
403 }
404 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
405 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
406 goto nla_put_failure;
407 /* fall through */
408 case L2TP_ENCAPTYPE_IP:
409#if IS_ENABLED(CONFIG_IPV6)
410 if (np) {
411 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
412 &np->saddr) ||
413 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
414 &sk->sk_v6_daddr))
415 goto nla_put_failure;
416 } else
417#endif
418 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
419 inet->inet_saddr) ||
420 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
421 inet->inet_daddr))
422 goto nla_put_failure;
423 break;
424 }
425
426out:
427 genlmsg_end(skb, hdr);
428 return 0;
429
430nla_put_failure:
431 genlmsg_cancel(skb, hdr);
432 return -1;
433}
434
435static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
436{
437 struct l2tp_tunnel *tunnel;
438 struct sk_buff *msg;
439 u32 tunnel_id;
440 int ret = -ENOBUFS;
441 struct net *net = genl_info_net(info);
442
443 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
444 ret = -EINVAL;
445 goto err;
446 }
447
448 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
449
450 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
451 if (!msg) {
452 ret = -ENOMEM;
453 goto err;
454 }
455
456 tunnel = l2tp_tunnel_get(net, tunnel_id);
457 if (!tunnel) {
458 ret = -ENODEV;
459 goto err_nlmsg;
460 }
461
462 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
463 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
464 if (ret < 0)
465 goto err_nlmsg_tunnel;
466
467 l2tp_tunnel_dec_refcount(tunnel);
468
469 return genlmsg_unicast(net, msg, info->snd_portid);
470
471err_nlmsg_tunnel:
472 l2tp_tunnel_dec_refcount(tunnel);
473err_nlmsg:
474 nlmsg_free(msg);
475err:
476 return ret;
477}
478
479static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
480{
481 int ti = cb->args[0];
482 struct l2tp_tunnel *tunnel;
483 struct net *net = sock_net(skb->sk);
484
485 for (;;) {
486 tunnel = l2tp_tunnel_find_nth(net, ti);
487 if (tunnel == NULL)
488 goto out;
489
490 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
491 cb->nlh->nlmsg_seq, NLM_F_MULTI,
492 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
493 goto out;
494
495 ti++;
496 }
497
498out:
499 cb->args[0] = ti;
500
501 return skb->len;
502}
503
504static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
505{
506 u32 tunnel_id = 0;
507 u32 session_id;
508 u32 peer_session_id;
509 int ret = 0;
510 struct l2tp_tunnel *tunnel;
511 struct l2tp_session *session;
512 struct l2tp_session_cfg cfg = { 0, };
513 struct net *net = genl_info_net(info);
514
515 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
516 ret = -EINVAL;
517 goto out;
518 }
519
520 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
521 tunnel = l2tp_tunnel_get(net, tunnel_id);
522 if (!tunnel) {
523 ret = -ENODEV;
524 goto out;
525 }
526
527 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
528 ret = -EINVAL;
529 goto out_tunnel;
530 }
531 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
532
533 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
534 ret = -EINVAL;
535 goto out_tunnel;
536 }
537 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
538
539 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
540 ret = -EINVAL;
541 goto out_tunnel;
542 }
543 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
544 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
545 ret = -EINVAL;
546 goto out_tunnel;
547 }
548
549 if (tunnel->version > 2) {
550 if (info->attrs[L2TP_ATTR_DATA_SEQ])
551 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
552
553 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
554 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
555 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
556 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
557 ret = -EINVAL;
558 goto out_tunnel;
559 }
560 } else {
561 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
562 }
563
564 if (info->attrs[L2TP_ATTR_COOKIE]) {
565 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
566 if (len > 8) {
567 ret = -EINVAL;
568 goto out_tunnel;
569 }
570 cfg.cookie_len = len;
571 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
572 }
573 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
574 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
575 if (len > 8) {
576 ret = -EINVAL;
577 goto out_tunnel;
578 }
579 cfg.peer_cookie_len = len;
580 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
581 }
582 if (info->attrs[L2TP_ATTR_IFNAME])
583 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
584
585 if (info->attrs[L2TP_ATTR_VLAN_ID])
586 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
587 }
588
589 if (info->attrs[L2TP_ATTR_DEBUG])
590 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
591
592 if (info->attrs[L2TP_ATTR_RECV_SEQ])
593 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
594
595 if (info->attrs[L2TP_ATTR_SEND_SEQ])
596 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
597
598 if (info->attrs[L2TP_ATTR_LNS_MODE])
599 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
600
601 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
602 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
603
604 if (info->attrs[L2TP_ATTR_MTU])
605 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
606
607 if (info->attrs[L2TP_ATTR_MRU])
608 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
609
610#ifdef CONFIG_MODULES
611 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
612 genl_unlock();
613 request_module("net-l2tp-type-%u", cfg.pw_type);
614 genl_lock();
615 }
616#endif
617 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
618 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
619 ret = -EPROTONOSUPPORT;
620 goto out_tunnel;
621 }
622
623 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
624 session_id,
625 peer_session_id,
626 &cfg);
627
628 if (ret >= 0) {
629 session = l2tp_session_get(net, tunnel, session_id);
630 if (session) {
631 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
632 L2TP_CMD_SESSION_CREATE);
633 l2tp_session_dec_refcount(session);
634 }
635 }
636
637out_tunnel:
638 l2tp_tunnel_dec_refcount(tunnel);
639out:
640 return ret;
641}
642
643static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
644{
645 int ret = 0;
646 struct l2tp_session *session;
647 u16 pw_type;
648
649 session = l2tp_nl_session_get(info);
650 if (session == NULL) {
651 ret = -ENODEV;
652 goto out;
653 }
654
655 l2tp_session_notify(&l2tp_nl_family, info,
656 session, L2TP_CMD_SESSION_DELETE);
657
658 pw_type = session->pwtype;
659 if (pw_type < __L2TP_PWTYPE_MAX)
660 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
661 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
662
663 l2tp_session_dec_refcount(session);
664
665out:
666 return ret;
667}
668
669static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
670{
671 int ret = 0;
672 struct l2tp_session *session;
673
674 session = l2tp_nl_session_get(info);
675 if (session == NULL) {
676 ret = -ENODEV;
677 goto out;
678 }
679
680 if (info->attrs[L2TP_ATTR_DEBUG])
681 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
682
683 if (info->attrs[L2TP_ATTR_DATA_SEQ])
684 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
685
686 if (info->attrs[L2TP_ATTR_RECV_SEQ])
687 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
688
689 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
690 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
691 l2tp_session_set_header_len(session, session->tunnel->version);
692 }
693
694 if (info->attrs[L2TP_ATTR_LNS_MODE])
695 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
696
697 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
698 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
699
700 if (info->attrs[L2TP_ATTR_MTU])
701 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
702
703 if (info->attrs[L2TP_ATTR_MRU])
704 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
705
706 ret = l2tp_session_notify(&l2tp_nl_family, info,
707 session, L2TP_CMD_SESSION_MODIFY);
708
709 l2tp_session_dec_refcount(session);
710
711out:
712 return ret;
713}
714
715static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
716 struct l2tp_session *session, u8 cmd)
717{
718 void *hdr;
719 struct nlattr *nest;
720 struct l2tp_tunnel *tunnel = session->tunnel;
721 struct sock *sk = NULL;
722
723 sk = tunnel->sock;
724
725 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
726 if (!hdr)
727 return -EMSGSIZE;
728
729 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
730 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
731 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
732 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
733 session->peer_session_id) ||
734 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
735 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
736 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
737 (session->mru &&
738 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
739 goto nla_put_failure;
740
741 if ((session->ifname[0] &&
742 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
743 (session->cookie_len &&
744 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
745 &session->cookie[0])) ||
746 (session->peer_cookie_len &&
747 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
748 &session->peer_cookie[0])) ||
749 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
750 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
751 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
752#ifdef CONFIG_XFRM
753 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
754 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
755#endif
756 (session->reorder_timeout &&
757 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
758 session->reorder_timeout, L2TP_ATTR_PAD)))
759 goto nla_put_failure;
760
761 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
762 if (nest == NULL)
763 goto nla_put_failure;
764
765 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
766 atomic_long_read(&session->stats.tx_packets),
767 L2TP_ATTR_STATS_PAD) ||
768 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
769 atomic_long_read(&session->stats.tx_bytes),
770 L2TP_ATTR_STATS_PAD) ||
771 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
772 atomic_long_read(&session->stats.tx_errors),
773 L2TP_ATTR_STATS_PAD) ||
774 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
775 atomic_long_read(&session->stats.rx_packets),
776 L2TP_ATTR_STATS_PAD) ||
777 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
778 atomic_long_read(&session->stats.rx_bytes),
779 L2TP_ATTR_STATS_PAD) ||
780 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
781 atomic_long_read(&session->stats.rx_seq_discards),
782 L2TP_ATTR_STATS_PAD) ||
783 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
784 atomic_long_read(&session->stats.rx_oos_packets),
785 L2TP_ATTR_STATS_PAD) ||
786 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
787 atomic_long_read(&session->stats.rx_errors),
788 L2TP_ATTR_STATS_PAD))
789 goto nla_put_failure;
790 nla_nest_end(skb, nest);
791
792 genlmsg_end(skb, hdr);
793 return 0;
794
795 nla_put_failure:
796 genlmsg_cancel(skb, hdr);
797 return -1;
798}
799
800static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
801{
802 struct l2tp_session *session;
803 struct sk_buff *msg;
804 int ret;
805
806 session = l2tp_nl_session_get(info);
807 if (session == NULL) {
808 ret = -ENODEV;
809 goto err;
810 }
811
812 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
813 if (!msg) {
814 ret = -ENOMEM;
815 goto err_ref;
816 }
817
818 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
819 0, session, L2TP_CMD_SESSION_GET);
820 if (ret < 0)
821 goto err_ref_msg;
822
823 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
824
825 l2tp_session_dec_refcount(session);
826
827 return ret;
828
829err_ref_msg:
830 nlmsg_free(msg);
831err_ref:
832 l2tp_session_dec_refcount(session);
833err:
834 return ret;
835}
836
837static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
838{
839 struct net *net = sock_net(skb->sk);
840 struct l2tp_session *session;
841 struct l2tp_tunnel *tunnel = NULL;
842 int ti = cb->args[0];
843 int si = cb->args[1];
844
845 for (;;) {
846 if (tunnel == NULL) {
847 tunnel = l2tp_tunnel_find_nth(net, ti);
848 if (tunnel == NULL)
849 goto out;
850 }
851
852 session = l2tp_session_get_nth(tunnel, si);
853 if (session == NULL) {
854 ti++;
855 tunnel = NULL;
856 si = 0;
857 continue;
858 }
859
860 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
861 cb->nlh->nlmsg_seq, NLM_F_MULTI,
862 session, L2TP_CMD_SESSION_GET) < 0) {
863 l2tp_session_dec_refcount(session);
864 break;
865 }
866 l2tp_session_dec_refcount(session);
867
868 si++;
869 }
870
871out:
872 cb->args[0] = ti;
873 cb->args[1] = si;
874
875 return skb->len;
876}
877
878static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
879 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
880 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
881 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
882 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
883 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
884 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
885 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
886 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
887 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
888 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
889 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
890 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
891 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
892 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
893 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
894 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
895 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
896 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
897 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
898 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
899 [L2TP_ATTR_FD] = { .type = NLA_U32, },
900 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
901 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
902 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
903 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
904 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
905 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
906 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
907 [L2TP_ATTR_IP6_SADDR] = {
908 .type = NLA_BINARY,
909 .len = sizeof(struct in6_addr),
910 },
911 [L2TP_ATTR_IP6_DADDR] = {
912 .type = NLA_BINARY,
913 .len = sizeof(struct in6_addr),
914 },
915 [L2TP_ATTR_IFNAME] = {
916 .type = NLA_NUL_STRING,
917 .len = IFNAMSIZ - 1,
918 },
919 [L2TP_ATTR_COOKIE] = {
920 .type = NLA_BINARY,
921 .len = 8,
922 },
923 [L2TP_ATTR_PEER_COOKIE] = {
924 .type = NLA_BINARY,
925 .len = 8,
926 },
927};
928
929static const struct genl_ops l2tp_nl_ops[] = {
930 {
931 .cmd = L2TP_CMD_NOOP,
932 .doit = l2tp_nl_cmd_noop,
933 .policy = l2tp_nl_policy,
934 /* can be retrieved by unprivileged users */
935 },
936 {
937 .cmd = L2TP_CMD_TUNNEL_CREATE,
938 .doit = l2tp_nl_cmd_tunnel_create,
939 .policy = l2tp_nl_policy,
940 .flags = GENL_ADMIN_PERM,
941 },
942 {
943 .cmd = L2TP_CMD_TUNNEL_DELETE,
944 .doit = l2tp_nl_cmd_tunnel_delete,
945 .policy = l2tp_nl_policy,
946 .flags = GENL_ADMIN_PERM,
947 },
948 {
949 .cmd = L2TP_CMD_TUNNEL_MODIFY,
950 .doit = l2tp_nl_cmd_tunnel_modify,
951 .policy = l2tp_nl_policy,
952 .flags = GENL_ADMIN_PERM,
953 },
954 {
955 .cmd = L2TP_CMD_TUNNEL_GET,
956 .doit = l2tp_nl_cmd_tunnel_get,
957 .dumpit = l2tp_nl_cmd_tunnel_dump,
958 .policy = l2tp_nl_policy,
959 .flags = GENL_ADMIN_PERM,
960 },
961 {
962 .cmd = L2TP_CMD_SESSION_CREATE,
963 .doit = l2tp_nl_cmd_session_create,
964 .policy = l2tp_nl_policy,
965 .flags = GENL_ADMIN_PERM,
966 },
967 {
968 .cmd = L2TP_CMD_SESSION_DELETE,
969 .doit = l2tp_nl_cmd_session_delete,
970 .policy = l2tp_nl_policy,
971 .flags = GENL_ADMIN_PERM,
972 },
973 {
974 .cmd = L2TP_CMD_SESSION_MODIFY,
975 .doit = l2tp_nl_cmd_session_modify,
976 .policy = l2tp_nl_policy,
977 .flags = GENL_ADMIN_PERM,
978 },
979 {
980 .cmd = L2TP_CMD_SESSION_GET,
981 .doit = l2tp_nl_cmd_session_get,
982 .dumpit = l2tp_nl_cmd_session_dump,
983 .policy = l2tp_nl_policy,
984 .flags = GENL_ADMIN_PERM,
985 },
986};
987
988static struct genl_family l2tp_nl_family __ro_after_init = {
989 .name = L2TP_GENL_NAME,
990 .version = L2TP_GENL_VERSION,
991 .hdrsize = 0,
992 .maxattr = L2TP_ATTR_MAX,
993 .netnsok = true,
994 .module = THIS_MODULE,
995 .ops = l2tp_nl_ops,
996 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
997 .mcgrps = l2tp_multicast_group,
998 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
999};
1000
1001int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1002{
1003 int ret;
1004
1005 ret = -EINVAL;
1006 if (pw_type >= __L2TP_PWTYPE_MAX)
1007 goto err;
1008
1009 genl_lock();
1010 ret = -EBUSY;
1011 if (l2tp_nl_cmd_ops[pw_type])
1012 goto out;
1013
1014 l2tp_nl_cmd_ops[pw_type] = ops;
1015 ret = 0;
1016
1017out:
1018 genl_unlock();
1019err:
1020 return ret;
1021}
1022EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1023
1024void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1025{
1026 if (pw_type < __L2TP_PWTYPE_MAX) {
1027 genl_lock();
1028 l2tp_nl_cmd_ops[pw_type] = NULL;
1029 genl_unlock();
1030 }
1031}
1032EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1033
1034static int __init l2tp_nl_init(void)
1035{
1036 pr_info("L2TP netlink interface\n");
1037 return genl_register_family(&l2tp_nl_family);
1038}
1039
1040static void l2tp_nl_cleanup(void)
1041{
1042 genl_unregister_family(&l2tp_nl_family);
1043}
1044
1045module_init(l2tp_nl_init);
1046module_exit(l2tp_nl_cleanup);
1047
1048MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1049MODULE_DESCRIPTION("L2TP netlink");
1050MODULE_LICENSE("GPL");
1051MODULE_VERSION("1.0");
1052MODULE_ALIAS_GENL_FAMILY("l2tp");