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[mirror_ubuntu-bionic-kernel.git] / net / l2tp / l2tp_netlink.c
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
34 static struct genl_family l2tp_nl_family;
35
36 static const struct genl_multicast_group l2tp_multicast_group[] = {
37 {
38 .name = L2TP_GENL_MCGROUP,
39 },
40 };
41
42 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
43 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
44 static 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 */
49 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
50
51 static struct l2tp_session *l2tp_nl_session_find(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_find_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_find(net, tunnel_id);
68 if (tunnel)
69 session = l2tp_session_find(net, tunnel, session_id);
70 }
71
72 return session;
73 }
74
75 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
76 {
77 struct sk_buff *msg;
78 void *hdr;
79 int ret = -ENOBUFS;
80
81 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
82 if (!msg) {
83 ret = -ENOMEM;
84 goto out;
85 }
86
87 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
88 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
89 if (!hdr) {
90 ret = -EMSGSIZE;
91 goto err_out;
92 }
93
94 genlmsg_end(msg, hdr);
95
96 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
97
98 err_out:
99 nlmsg_free(msg);
100
101 out:
102 return ret;
103 }
104
105 static int l2tp_tunnel_notify(struct genl_family *family,
106 struct genl_info *info,
107 struct l2tp_tunnel *tunnel,
108 u8 cmd)
109 {
110 struct sk_buff *msg;
111 int ret;
112
113 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
114 if (!msg)
115 return -ENOMEM;
116
117 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
118 NLM_F_ACK, tunnel, cmd);
119
120 if (ret >= 0) {
121 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
122 /* We don't care if no one is listening */
123 if (ret == -ESRCH)
124 ret = 0;
125 return ret;
126 }
127
128 nlmsg_free(msg);
129
130 return ret;
131 }
132
133 static int l2tp_session_notify(struct genl_family *family,
134 struct genl_info *info,
135 struct l2tp_session *session,
136 u8 cmd)
137 {
138 struct sk_buff *msg;
139 int ret;
140
141 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
142 if (!msg)
143 return -ENOMEM;
144
145 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
146 NLM_F_ACK, session, cmd);
147
148 if (ret >= 0) {
149 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
150 /* We don't care if no one is listening */
151 if (ret == -ESRCH)
152 ret = 0;
153 return ret;
154 }
155
156 nlmsg_free(msg);
157
158 return ret;
159 }
160
161 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
162 {
163 u32 tunnel_id;
164 u32 peer_tunnel_id;
165 int proto_version;
166 int fd;
167 int ret = 0;
168 struct l2tp_tunnel_cfg cfg = { 0, };
169 struct l2tp_tunnel *tunnel;
170 struct net *net = genl_info_net(info);
171
172 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
173 ret = -EINVAL;
174 goto out;
175 }
176 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
177
178 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
179 ret = -EINVAL;
180 goto out;
181 }
182 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
183
184 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
185 ret = -EINVAL;
186 goto out;
187 }
188 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
189
190 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
191 ret = -EINVAL;
192 goto out;
193 }
194 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
195
196 fd = -1;
197 if (info->attrs[L2TP_ATTR_FD]) {
198 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
199 } else {
200 #if IS_ENABLED(CONFIG_IPV6)
201 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
202 info->attrs[L2TP_ATTR_IP6_DADDR]) {
203 cfg.local_ip6 = nla_data(
204 info->attrs[L2TP_ATTR_IP6_SADDR]);
205 cfg.peer_ip6 = nla_data(
206 info->attrs[L2TP_ATTR_IP6_DADDR]);
207 } else
208 #endif
209 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
210 info->attrs[L2TP_ATTR_IP_DADDR]) {
211 cfg.local_ip.s_addr = nla_get_in_addr(
212 info->attrs[L2TP_ATTR_IP_SADDR]);
213 cfg.peer_ip.s_addr = nla_get_in_addr(
214 info->attrs[L2TP_ATTR_IP_DADDR]);
215 } else {
216 ret = -EINVAL;
217 goto out;
218 }
219 if (info->attrs[L2TP_ATTR_UDP_SPORT])
220 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
221 if (info->attrs[L2TP_ATTR_UDP_DPORT])
222 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
223 cfg.use_udp_checksums = nla_get_flag(
224 info->attrs[L2TP_ATTR_UDP_CSUM]);
225
226 #if IS_ENABLED(CONFIG_IPV6)
227 cfg.udp6_zero_tx_checksums = nla_get_flag(
228 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
229 cfg.udp6_zero_rx_checksums = nla_get_flag(
230 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
231 #endif
232 }
233
234 if (info->attrs[L2TP_ATTR_DEBUG])
235 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
236
237 tunnel = l2tp_tunnel_find(net, tunnel_id);
238 if (tunnel != NULL) {
239 ret = -EEXIST;
240 goto out;
241 }
242
243 ret = -EINVAL;
244 switch (cfg.encap) {
245 case L2TP_ENCAPTYPE_UDP:
246 case L2TP_ENCAPTYPE_IP:
247 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
248 peer_tunnel_id, &cfg, &tunnel);
249 break;
250 }
251
252 if (ret >= 0)
253 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
254 tunnel, L2TP_CMD_TUNNEL_CREATE);
255 out:
256 return ret;
257 }
258
259 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
260 {
261 struct l2tp_tunnel *tunnel;
262 u32 tunnel_id;
263 int ret = 0;
264 struct net *net = genl_info_net(info);
265
266 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
267 ret = -EINVAL;
268 goto out;
269 }
270 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
271
272 tunnel = l2tp_tunnel_find(net, tunnel_id);
273 if (tunnel == NULL) {
274 ret = -ENODEV;
275 goto out;
276 }
277
278 l2tp_tunnel_notify(&l2tp_nl_family, info,
279 tunnel, L2TP_CMD_TUNNEL_DELETE);
280
281 (void) l2tp_tunnel_delete(tunnel);
282
283 out:
284 return ret;
285 }
286
287 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
288 {
289 struct l2tp_tunnel *tunnel;
290 u32 tunnel_id;
291 int ret = 0;
292 struct net *net = genl_info_net(info);
293
294 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
295 ret = -EINVAL;
296 goto out;
297 }
298 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
299
300 tunnel = l2tp_tunnel_find(net, tunnel_id);
301 if (tunnel == NULL) {
302 ret = -ENODEV;
303 goto out;
304 }
305
306 if (info->attrs[L2TP_ATTR_DEBUG])
307 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
308
309 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
310 tunnel, L2TP_CMD_TUNNEL_MODIFY);
311
312 out:
313 return ret;
314 }
315
316 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
317 struct l2tp_tunnel *tunnel, u8 cmd)
318 {
319 void *hdr;
320 struct nlattr *nest;
321 struct sock *sk = NULL;
322 struct inet_sock *inet;
323 #if IS_ENABLED(CONFIG_IPV6)
324 struct ipv6_pinfo *np = NULL;
325 #endif
326
327 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
328 if (!hdr)
329 return -EMSGSIZE;
330
331 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
332 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
333 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
334 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
335 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
336 goto nla_put_failure;
337
338 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
339 if (nest == NULL)
340 goto nla_put_failure;
341
342 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
343 atomic_long_read(&tunnel->stats.tx_packets),
344 L2TP_ATTR_STATS_PAD) ||
345 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
346 atomic_long_read(&tunnel->stats.tx_bytes),
347 L2TP_ATTR_STATS_PAD) ||
348 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
349 atomic_long_read(&tunnel->stats.tx_errors),
350 L2TP_ATTR_STATS_PAD) ||
351 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
352 atomic_long_read(&tunnel->stats.rx_packets),
353 L2TP_ATTR_STATS_PAD) ||
354 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
355 atomic_long_read(&tunnel->stats.rx_bytes),
356 L2TP_ATTR_STATS_PAD) ||
357 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
358 atomic_long_read(&tunnel->stats.rx_seq_discards),
359 L2TP_ATTR_STATS_PAD) ||
360 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
361 atomic_long_read(&tunnel->stats.rx_oos_packets),
362 L2TP_ATTR_STATS_PAD) ||
363 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
364 atomic_long_read(&tunnel->stats.rx_errors),
365 L2TP_ATTR_STATS_PAD))
366 goto nla_put_failure;
367 nla_nest_end(skb, nest);
368
369 sk = tunnel->sock;
370 if (!sk)
371 goto out;
372
373 #if IS_ENABLED(CONFIG_IPV6)
374 if (sk->sk_family == AF_INET6)
375 np = inet6_sk(sk);
376 #endif
377
378 inet = inet_sk(sk);
379
380 switch (tunnel->encap) {
381 case L2TP_ENCAPTYPE_UDP:
382 switch (sk->sk_family) {
383 case AF_INET:
384 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
385 goto nla_put_failure;
386 break;
387 #if IS_ENABLED(CONFIG_IPV6)
388 case AF_INET6:
389 if (udp_get_no_check6_tx(sk) &&
390 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
391 goto nla_put_failure;
392 if (udp_get_no_check6_rx(sk) &&
393 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
394 goto nla_put_failure;
395 break;
396 #endif
397 }
398 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
399 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
400 goto nla_put_failure;
401 /* NOBREAK */
402 case L2TP_ENCAPTYPE_IP:
403 #if IS_ENABLED(CONFIG_IPV6)
404 if (np) {
405 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
406 &np->saddr) ||
407 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
408 &sk->sk_v6_daddr))
409 goto nla_put_failure;
410 } else
411 #endif
412 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
413 inet->inet_saddr) ||
414 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
415 inet->inet_daddr))
416 goto nla_put_failure;
417 break;
418 }
419
420 out:
421 genlmsg_end(skb, hdr);
422 return 0;
423
424 nla_put_failure:
425 genlmsg_cancel(skb, hdr);
426 return -1;
427 }
428
429 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
430 {
431 struct l2tp_tunnel *tunnel;
432 struct sk_buff *msg;
433 u32 tunnel_id;
434 int ret = -ENOBUFS;
435 struct net *net = genl_info_net(info);
436
437 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
438 ret = -EINVAL;
439 goto out;
440 }
441
442 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
443
444 tunnel = l2tp_tunnel_find(net, tunnel_id);
445 if (tunnel == NULL) {
446 ret = -ENODEV;
447 goto out;
448 }
449
450 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
451 if (!msg) {
452 ret = -ENOMEM;
453 goto out;
454 }
455
456 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
457 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
458 if (ret < 0)
459 goto err_out;
460
461 return genlmsg_unicast(net, msg, info->snd_portid);
462
463 err_out:
464 nlmsg_free(msg);
465
466 out:
467 return ret;
468 }
469
470 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
471 {
472 int ti = cb->args[0];
473 struct l2tp_tunnel *tunnel;
474 struct net *net = sock_net(skb->sk);
475
476 for (;;) {
477 tunnel = l2tp_tunnel_find_nth(net, ti);
478 if (tunnel == NULL)
479 goto out;
480
481 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
482 cb->nlh->nlmsg_seq, NLM_F_MULTI,
483 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
484 goto out;
485
486 ti++;
487 }
488
489 out:
490 cb->args[0] = ti;
491
492 return skb->len;
493 }
494
495 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
496 {
497 u32 tunnel_id = 0;
498 u32 session_id;
499 u32 peer_session_id;
500 int ret = 0;
501 struct l2tp_tunnel *tunnel;
502 struct l2tp_session *session;
503 struct l2tp_session_cfg cfg = { 0, };
504 struct net *net = genl_info_net(info);
505
506 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
507 ret = -EINVAL;
508 goto out;
509 }
510 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
511 tunnel = l2tp_tunnel_find(net, tunnel_id);
512 if (!tunnel) {
513 ret = -ENODEV;
514 goto out;
515 }
516
517 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
518 ret = -EINVAL;
519 goto out;
520 }
521 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
522 session = l2tp_session_find(net, tunnel, session_id);
523 if (session) {
524 ret = -EEXIST;
525 goto out;
526 }
527
528 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
529 ret = -EINVAL;
530 goto out;
531 }
532 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
533
534 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
535 ret = -EINVAL;
536 goto out;
537 }
538 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
539 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
540 ret = -EINVAL;
541 goto out;
542 }
543
544 if (tunnel->version > 2) {
545 if (info->attrs[L2TP_ATTR_OFFSET])
546 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
547
548 if (info->attrs[L2TP_ATTR_DATA_SEQ])
549 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
550
551 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
552 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
553 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
554
555 cfg.l2specific_len = 4;
556 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
557 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
558
559 if (info->attrs[L2TP_ATTR_COOKIE]) {
560 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
561 if (len > 8) {
562 ret = -EINVAL;
563 goto out;
564 }
565 cfg.cookie_len = len;
566 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
567 }
568 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
569 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
570 if (len > 8) {
571 ret = -EINVAL;
572 goto out;
573 }
574 cfg.peer_cookie_len = len;
575 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
576 }
577 if (info->attrs[L2TP_ATTR_IFNAME])
578 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
579
580 if (info->attrs[L2TP_ATTR_VLAN_ID])
581 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
582 }
583
584 if (info->attrs[L2TP_ATTR_DEBUG])
585 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
586
587 if (info->attrs[L2TP_ATTR_RECV_SEQ])
588 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
589
590 if (info->attrs[L2TP_ATTR_SEND_SEQ])
591 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
592
593 if (info->attrs[L2TP_ATTR_LNS_MODE])
594 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
595
596 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
597 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
598
599 if (info->attrs[L2TP_ATTR_MTU])
600 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
601
602 if (info->attrs[L2TP_ATTR_MRU])
603 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
604
605 #ifdef CONFIG_MODULES
606 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
607 genl_unlock();
608 request_module("net-l2tp-type-%u", cfg.pw_type);
609 genl_lock();
610 }
611 #endif
612 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
613 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
614 ret = -EPROTONOSUPPORT;
615 goto out;
616 }
617
618 /* Check that pseudowire-specific params are present */
619 switch (cfg.pw_type) {
620 case L2TP_PWTYPE_NONE:
621 break;
622 case L2TP_PWTYPE_ETH_VLAN:
623 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
624 ret = -EINVAL;
625 goto out;
626 }
627 break;
628 case L2TP_PWTYPE_ETH:
629 break;
630 case L2TP_PWTYPE_PPP:
631 case L2TP_PWTYPE_PPP_AC:
632 break;
633 case L2TP_PWTYPE_IP:
634 default:
635 ret = -EPROTONOSUPPORT;
636 break;
637 }
638
639 ret = -EPROTONOSUPPORT;
640 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
641 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
642 session_id, peer_session_id, &cfg);
643
644 if (ret >= 0) {
645 session = l2tp_session_find(net, tunnel, session_id);
646 if (session)
647 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
648 L2TP_CMD_SESSION_CREATE);
649 }
650
651 out:
652 return ret;
653 }
654
655 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
656 {
657 int ret = 0;
658 struct l2tp_session *session;
659 u16 pw_type;
660
661 session = l2tp_nl_session_find(info);
662 if (session == NULL) {
663 ret = -ENODEV;
664 goto out;
665 }
666
667 l2tp_session_notify(&l2tp_nl_family, info,
668 session, L2TP_CMD_SESSION_DELETE);
669
670 pw_type = session->pwtype;
671 if (pw_type < __L2TP_PWTYPE_MAX)
672 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
673 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
674
675 out:
676 return ret;
677 }
678
679 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
680 {
681 int ret = 0;
682 struct l2tp_session *session;
683
684 session = l2tp_nl_session_find(info);
685 if (session == NULL) {
686 ret = -ENODEV;
687 goto out;
688 }
689
690 if (info->attrs[L2TP_ATTR_DEBUG])
691 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
692
693 if (info->attrs[L2TP_ATTR_DATA_SEQ])
694 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
695
696 if (info->attrs[L2TP_ATTR_RECV_SEQ])
697 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
698
699 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
700 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
701 l2tp_session_set_header_len(session, session->tunnel->version);
702 }
703
704 if (info->attrs[L2TP_ATTR_LNS_MODE])
705 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
706
707 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
708 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
709
710 if (info->attrs[L2TP_ATTR_MTU])
711 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
712
713 if (info->attrs[L2TP_ATTR_MRU])
714 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
715
716 ret = l2tp_session_notify(&l2tp_nl_family, info,
717 session, L2TP_CMD_SESSION_MODIFY);
718
719 out:
720 return ret;
721 }
722
723 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
724 struct l2tp_session *session, u8 cmd)
725 {
726 void *hdr;
727 struct nlattr *nest;
728 struct l2tp_tunnel *tunnel = session->tunnel;
729 struct sock *sk = NULL;
730
731 sk = tunnel->sock;
732
733 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
734 if (!hdr)
735 return -EMSGSIZE;
736
737 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
738 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
739 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
740 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
741 session->peer_session_id) ||
742 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
743 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
744 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
745 (session->mru &&
746 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
747 goto nla_put_failure;
748
749 if ((session->ifname[0] &&
750 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
751 (session->cookie_len &&
752 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
753 &session->cookie[0])) ||
754 (session->peer_cookie_len &&
755 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
756 &session->peer_cookie[0])) ||
757 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
758 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
759 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
760 #ifdef CONFIG_XFRM
761 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
762 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
763 #endif
764 (session->reorder_timeout &&
765 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
766 session->reorder_timeout, L2TP_ATTR_PAD)))
767 goto nla_put_failure;
768
769 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
770 if (nest == NULL)
771 goto nla_put_failure;
772
773 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
774 atomic_long_read(&session->stats.tx_packets),
775 L2TP_ATTR_STATS_PAD) ||
776 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
777 atomic_long_read(&session->stats.tx_bytes),
778 L2TP_ATTR_STATS_PAD) ||
779 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
780 atomic_long_read(&session->stats.tx_errors),
781 L2TP_ATTR_STATS_PAD) ||
782 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
783 atomic_long_read(&session->stats.rx_packets),
784 L2TP_ATTR_STATS_PAD) ||
785 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
786 atomic_long_read(&session->stats.rx_bytes),
787 L2TP_ATTR_STATS_PAD) ||
788 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
789 atomic_long_read(&session->stats.rx_seq_discards),
790 L2TP_ATTR_STATS_PAD) ||
791 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
792 atomic_long_read(&session->stats.rx_oos_packets),
793 L2TP_ATTR_STATS_PAD) ||
794 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
795 atomic_long_read(&session->stats.rx_errors),
796 L2TP_ATTR_STATS_PAD))
797 goto nla_put_failure;
798 nla_nest_end(skb, nest);
799
800 genlmsg_end(skb, hdr);
801 return 0;
802
803 nla_put_failure:
804 genlmsg_cancel(skb, hdr);
805 return -1;
806 }
807
808 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
809 {
810 struct l2tp_session *session;
811 struct sk_buff *msg;
812 int ret;
813
814 session = l2tp_nl_session_find(info);
815 if (session == NULL) {
816 ret = -ENODEV;
817 goto out;
818 }
819
820 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
821 if (!msg) {
822 ret = -ENOMEM;
823 goto out;
824 }
825
826 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
827 0, session, L2TP_CMD_SESSION_GET);
828 if (ret < 0)
829 goto err_out;
830
831 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
832
833 err_out:
834 nlmsg_free(msg);
835
836 out:
837 return ret;
838 }
839
840 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
841 {
842 struct net *net = sock_net(skb->sk);
843 struct l2tp_session *session;
844 struct l2tp_tunnel *tunnel = NULL;
845 int ti = cb->args[0];
846 int si = cb->args[1];
847
848 for (;;) {
849 if (tunnel == NULL) {
850 tunnel = l2tp_tunnel_find_nth(net, ti);
851 if (tunnel == NULL)
852 goto out;
853 }
854
855 session = l2tp_session_find_nth(tunnel, si);
856 if (session == NULL) {
857 ti++;
858 tunnel = NULL;
859 si = 0;
860 continue;
861 }
862
863 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
864 cb->nlh->nlmsg_seq, NLM_F_MULTI,
865 session, L2TP_CMD_SESSION_GET) < 0)
866 break;
867
868 si++;
869 }
870
871 out:
872 cb->args[0] = ti;
873 cb->args[1] = si;
874
875 return skb->len;
876 }
877
878 static 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
929 static 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
988 static 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
1001 int 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
1017 out:
1018 genl_unlock();
1019 err:
1020 return ret;
1021 }
1022 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1023
1024 void 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 }
1032 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1033
1034 static int __init l2tp_nl_init(void)
1035 {
1036 pr_info("L2TP netlink interface\n");
1037 return genl_register_family(&l2tp_nl_family);
1038 }
1039
1040 static void l2tp_nl_cleanup(void)
1041 {
1042 genl_unregister_family(&l2tp_nl_family);
1043 }
1044
1045 module_init(l2tp_nl_init);
1046 module_exit(l2tp_nl_cleanup);
1047
1048 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1049 MODULE_DESCRIPTION("L2TP netlink");
1050 MODULE_LICENSE("GPL");
1051 MODULE_VERSION("1.0");
1052 MODULE_ALIAS_GENL_FAMILY("l2tp");
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