]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/l2tp/l2tp_netlink.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'nfs-for-4.15-2' of git://git.linux-nfs.org/projects/anna/linux-nfs
[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_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
77 static 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
100 err_out:
101 nlmsg_free(msg);
102
103 out:
104 return ret;
105 }
106
107 static 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
135 static 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
163 static 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);
257 out:
258 return ret;
259 }
260
261 static 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
287 out:
288 return ret;
289 }
290
291 static 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
318 out:
319 return ret;
320 }
321
322 static 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
426 out:
427 genlmsg_end(skb, hdr);
428 return 0;
429
430 nla_put_failure:
431 genlmsg_cancel(skb, hdr);
432 return -1;
433 }
434
435 static 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
471 err_nlmsg_tunnel:
472 l2tp_tunnel_dec_refcount(tunnel);
473 err_nlmsg:
474 nlmsg_free(msg);
475 err:
476 return ret;
477 }
478
479 static 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
498 out:
499 cb->args[0] = ti;
500
501 return skb->len;
502 }
503
504 static 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_OFFSET])
551 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
552
553 if (info->attrs[L2TP_ATTR_DATA_SEQ])
554 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
555
556 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
557 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
558 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
559
560 cfg.l2specific_len = 4;
561 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
562 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
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 /* Check that pseudowire-specific params are present */
624 switch (cfg.pw_type) {
625 case L2TP_PWTYPE_NONE:
626 break;
627 case L2TP_PWTYPE_ETH_VLAN:
628 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
629 ret = -EINVAL;
630 goto out_tunnel;
631 }
632 break;
633 case L2TP_PWTYPE_ETH:
634 break;
635 case L2TP_PWTYPE_PPP:
636 case L2TP_PWTYPE_PPP_AC:
637 break;
638 case L2TP_PWTYPE_IP:
639 default:
640 ret = -EPROTONOSUPPORT;
641 break;
642 }
643
644 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
645 session_id,
646 peer_session_id,
647 &cfg);
648
649 if (ret >= 0) {
650 session = l2tp_session_get(net, tunnel, session_id);
651 if (session) {
652 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
653 L2TP_CMD_SESSION_CREATE);
654 l2tp_session_dec_refcount(session);
655 }
656 }
657
658 out_tunnel:
659 l2tp_tunnel_dec_refcount(tunnel);
660 out:
661 return ret;
662 }
663
664 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
665 {
666 int ret = 0;
667 struct l2tp_session *session;
668 u16 pw_type;
669
670 session = l2tp_nl_session_get(info);
671 if (session == NULL) {
672 ret = -ENODEV;
673 goto out;
674 }
675
676 l2tp_session_notify(&l2tp_nl_family, info,
677 session, L2TP_CMD_SESSION_DELETE);
678
679 pw_type = session->pwtype;
680 if (pw_type < __L2TP_PWTYPE_MAX)
681 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
682 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
683
684 l2tp_session_dec_refcount(session);
685
686 out:
687 return ret;
688 }
689
690 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
691 {
692 int ret = 0;
693 struct l2tp_session *session;
694
695 session = l2tp_nl_session_get(info);
696 if (session == NULL) {
697 ret = -ENODEV;
698 goto out;
699 }
700
701 if (info->attrs[L2TP_ATTR_DEBUG])
702 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
703
704 if (info->attrs[L2TP_ATTR_DATA_SEQ])
705 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
706
707 if (info->attrs[L2TP_ATTR_RECV_SEQ])
708 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
709
710 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
711 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
712 l2tp_session_set_header_len(session, session->tunnel->version);
713 }
714
715 if (info->attrs[L2TP_ATTR_LNS_MODE])
716 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
717
718 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
719 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
720
721 if (info->attrs[L2TP_ATTR_MTU])
722 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
723
724 if (info->attrs[L2TP_ATTR_MRU])
725 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
726
727 ret = l2tp_session_notify(&l2tp_nl_family, info,
728 session, L2TP_CMD_SESSION_MODIFY);
729
730 l2tp_session_dec_refcount(session);
731
732 out:
733 return ret;
734 }
735
736 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
737 struct l2tp_session *session, u8 cmd)
738 {
739 void *hdr;
740 struct nlattr *nest;
741 struct l2tp_tunnel *tunnel = session->tunnel;
742 struct sock *sk = NULL;
743
744 sk = tunnel->sock;
745
746 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
747 if (!hdr)
748 return -EMSGSIZE;
749
750 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
751 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
752 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
753 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
754 session->peer_session_id) ||
755 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
756 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
757 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
758 (session->mru &&
759 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
760 goto nla_put_failure;
761
762 if ((session->ifname[0] &&
763 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
764 (session->cookie_len &&
765 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
766 &session->cookie[0])) ||
767 (session->peer_cookie_len &&
768 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
769 &session->peer_cookie[0])) ||
770 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
771 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
772 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
773 #ifdef CONFIG_XFRM
774 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
775 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
776 #endif
777 (session->reorder_timeout &&
778 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
779 session->reorder_timeout, L2TP_ATTR_PAD)))
780 goto nla_put_failure;
781
782 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
783 if (nest == NULL)
784 goto nla_put_failure;
785
786 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
787 atomic_long_read(&session->stats.tx_packets),
788 L2TP_ATTR_STATS_PAD) ||
789 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
790 atomic_long_read(&session->stats.tx_bytes),
791 L2TP_ATTR_STATS_PAD) ||
792 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
793 atomic_long_read(&session->stats.tx_errors),
794 L2TP_ATTR_STATS_PAD) ||
795 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
796 atomic_long_read(&session->stats.rx_packets),
797 L2TP_ATTR_STATS_PAD) ||
798 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
799 atomic_long_read(&session->stats.rx_bytes),
800 L2TP_ATTR_STATS_PAD) ||
801 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
802 atomic_long_read(&session->stats.rx_seq_discards),
803 L2TP_ATTR_STATS_PAD) ||
804 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
805 atomic_long_read(&session->stats.rx_oos_packets),
806 L2TP_ATTR_STATS_PAD) ||
807 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
808 atomic_long_read(&session->stats.rx_errors),
809 L2TP_ATTR_STATS_PAD))
810 goto nla_put_failure;
811 nla_nest_end(skb, nest);
812
813 genlmsg_end(skb, hdr);
814 return 0;
815
816 nla_put_failure:
817 genlmsg_cancel(skb, hdr);
818 return -1;
819 }
820
821 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
822 {
823 struct l2tp_session *session;
824 struct sk_buff *msg;
825 int ret;
826
827 session = l2tp_nl_session_get(info);
828 if (session == NULL) {
829 ret = -ENODEV;
830 goto err;
831 }
832
833 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
834 if (!msg) {
835 ret = -ENOMEM;
836 goto err_ref;
837 }
838
839 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
840 0, session, L2TP_CMD_SESSION_GET);
841 if (ret < 0)
842 goto err_ref_msg;
843
844 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
845
846 l2tp_session_dec_refcount(session);
847
848 return ret;
849
850 err_ref_msg:
851 nlmsg_free(msg);
852 err_ref:
853 l2tp_session_dec_refcount(session);
854 err:
855 return ret;
856 }
857
858 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
859 {
860 struct net *net = sock_net(skb->sk);
861 struct l2tp_session *session;
862 struct l2tp_tunnel *tunnel = NULL;
863 int ti = cb->args[0];
864 int si = cb->args[1];
865
866 for (;;) {
867 if (tunnel == NULL) {
868 tunnel = l2tp_tunnel_find_nth(net, ti);
869 if (tunnel == NULL)
870 goto out;
871 }
872
873 session = l2tp_session_get_nth(tunnel, si);
874 if (session == NULL) {
875 ti++;
876 tunnel = NULL;
877 si = 0;
878 continue;
879 }
880
881 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
882 cb->nlh->nlmsg_seq, NLM_F_MULTI,
883 session, L2TP_CMD_SESSION_GET) < 0) {
884 l2tp_session_dec_refcount(session);
885 break;
886 }
887 l2tp_session_dec_refcount(session);
888
889 si++;
890 }
891
892 out:
893 cb->args[0] = ti;
894 cb->args[1] = si;
895
896 return skb->len;
897 }
898
899 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
900 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
901 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
902 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
903 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
904 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
905 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
906 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
907 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
908 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
909 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
910 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
911 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
912 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
913 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
914 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
915 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
916 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
917 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
918 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
919 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
920 [L2TP_ATTR_FD] = { .type = NLA_U32, },
921 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
922 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
923 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
924 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
925 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
926 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
927 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
928 [L2TP_ATTR_IP6_SADDR] = {
929 .type = NLA_BINARY,
930 .len = sizeof(struct in6_addr),
931 },
932 [L2TP_ATTR_IP6_DADDR] = {
933 .type = NLA_BINARY,
934 .len = sizeof(struct in6_addr),
935 },
936 [L2TP_ATTR_IFNAME] = {
937 .type = NLA_NUL_STRING,
938 .len = IFNAMSIZ - 1,
939 },
940 [L2TP_ATTR_COOKIE] = {
941 .type = NLA_BINARY,
942 .len = 8,
943 },
944 [L2TP_ATTR_PEER_COOKIE] = {
945 .type = NLA_BINARY,
946 .len = 8,
947 },
948 };
949
950 static const struct genl_ops l2tp_nl_ops[] = {
951 {
952 .cmd = L2TP_CMD_NOOP,
953 .doit = l2tp_nl_cmd_noop,
954 .policy = l2tp_nl_policy,
955 /* can be retrieved by unprivileged users */
956 },
957 {
958 .cmd = L2TP_CMD_TUNNEL_CREATE,
959 .doit = l2tp_nl_cmd_tunnel_create,
960 .policy = l2tp_nl_policy,
961 .flags = GENL_ADMIN_PERM,
962 },
963 {
964 .cmd = L2TP_CMD_TUNNEL_DELETE,
965 .doit = l2tp_nl_cmd_tunnel_delete,
966 .policy = l2tp_nl_policy,
967 .flags = GENL_ADMIN_PERM,
968 },
969 {
970 .cmd = L2TP_CMD_TUNNEL_MODIFY,
971 .doit = l2tp_nl_cmd_tunnel_modify,
972 .policy = l2tp_nl_policy,
973 .flags = GENL_ADMIN_PERM,
974 },
975 {
976 .cmd = L2TP_CMD_TUNNEL_GET,
977 .doit = l2tp_nl_cmd_tunnel_get,
978 .dumpit = l2tp_nl_cmd_tunnel_dump,
979 .policy = l2tp_nl_policy,
980 .flags = GENL_ADMIN_PERM,
981 },
982 {
983 .cmd = L2TP_CMD_SESSION_CREATE,
984 .doit = l2tp_nl_cmd_session_create,
985 .policy = l2tp_nl_policy,
986 .flags = GENL_ADMIN_PERM,
987 },
988 {
989 .cmd = L2TP_CMD_SESSION_DELETE,
990 .doit = l2tp_nl_cmd_session_delete,
991 .policy = l2tp_nl_policy,
992 .flags = GENL_ADMIN_PERM,
993 },
994 {
995 .cmd = L2TP_CMD_SESSION_MODIFY,
996 .doit = l2tp_nl_cmd_session_modify,
997 .policy = l2tp_nl_policy,
998 .flags = GENL_ADMIN_PERM,
999 },
1000 {
1001 .cmd = L2TP_CMD_SESSION_GET,
1002 .doit = l2tp_nl_cmd_session_get,
1003 .dumpit = l2tp_nl_cmd_session_dump,
1004 .policy = l2tp_nl_policy,
1005 .flags = GENL_ADMIN_PERM,
1006 },
1007 };
1008
1009 static struct genl_family l2tp_nl_family __ro_after_init = {
1010 .name = L2TP_GENL_NAME,
1011 .version = L2TP_GENL_VERSION,
1012 .hdrsize = 0,
1013 .maxattr = L2TP_ATTR_MAX,
1014 .netnsok = true,
1015 .module = THIS_MODULE,
1016 .ops = l2tp_nl_ops,
1017 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1018 .mcgrps = l2tp_multicast_group,
1019 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1020 };
1021
1022 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1023 {
1024 int ret;
1025
1026 ret = -EINVAL;
1027 if (pw_type >= __L2TP_PWTYPE_MAX)
1028 goto err;
1029
1030 genl_lock();
1031 ret = -EBUSY;
1032 if (l2tp_nl_cmd_ops[pw_type])
1033 goto out;
1034
1035 l2tp_nl_cmd_ops[pw_type] = ops;
1036 ret = 0;
1037
1038 out:
1039 genl_unlock();
1040 err:
1041 return ret;
1042 }
1043 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1044
1045 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1046 {
1047 if (pw_type < __L2TP_PWTYPE_MAX) {
1048 genl_lock();
1049 l2tp_nl_cmd_ops[pw_type] = NULL;
1050 genl_unlock();
1051 }
1052 }
1053 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1054
1055 static int __init l2tp_nl_init(void)
1056 {
1057 pr_info("L2TP netlink interface\n");
1058 return genl_register_family(&l2tp_nl_family);
1059 }
1060
1061 static void l2tp_nl_cleanup(void)
1062 {
1063 genl_unregister_family(&l2tp_nl_family);
1064 }
1065
1066 module_init(l2tp_nl_init);
1067 module_exit(l2tp_nl_cleanup);
1068
1069 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1070 MODULE_DESCRIPTION("L2TP netlink");
1071 MODULE_LICENSE("GPL");
1072 MODULE_VERSION("1.0");
1073 MODULE_ALIAS_GENL_FAMILY("l2tp");
ubuntu-bionic-kernel mirror