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Linux 4.1.18
[linux/fpc-iii.git] / net / l2tp / l2tp_netlink.c
blob9e13c2ff878970fbbe355990f756684d9e868988
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 .id = GENL_ID_GENERATE,
36 .name = L2TP_GENL_NAME,
37 .version = L2TP_GENL_VERSION,
38 .hdrsize = 0,
39 .maxattr = L2TP_ATTR_MAX,
40 .netnsok = true,
41 };
42
43 static const struct genl_multicast_group l2tp_multicast_group[] = {
44 {
45 .name = L2TP_GENL_MCGROUP,
46 },
47 };
48
49 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
50 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
51 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
52 int flags, struct l2tp_session *session,
53 u8 cmd);
54
55 /* Accessed under genl lock */
56 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
57
58 static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
59 {
60 u32 tunnel_id;
61 u32 session_id;
62 char *ifname;
63 struct l2tp_tunnel *tunnel;
64 struct l2tp_session *session = NULL;
65 struct net *net = genl_info_net(info);
66
67 if (info->attrs[L2TP_ATTR_IFNAME]) {
68 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
69 session = l2tp_session_find_by_ifname(net, ifname);
70 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
71 (info->attrs[L2TP_ATTR_CONN_ID])) {
72 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
73 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
74 tunnel = l2tp_tunnel_find(net, tunnel_id);
75 if (tunnel)
76 session = l2tp_session_find(net, tunnel, session_id);
77 }
78
79 return session;
80 }
81
82 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
83 {
84 struct sk_buff *msg;
85 void *hdr;
86 int ret = -ENOBUFS;
87
88 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
89 if (!msg) {
90 ret = -ENOMEM;
91 goto out;
92 }
93
94 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
95 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
96 if (!hdr) {
97 ret = -EMSGSIZE;
98 goto err_out;
99 }
100
101 genlmsg_end(msg, hdr);
102
103 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
104
105 err_out:
106 nlmsg_free(msg);
107
108 out:
109 return ret;
110 }
111
112 static int l2tp_tunnel_notify(struct genl_family *family,
113 struct genl_info *info,
114 struct l2tp_tunnel *tunnel,
115 u8 cmd)
116 {
117 struct sk_buff *msg;
118 int ret;
119
120 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
121 if (!msg)
122 return -ENOMEM;
123
124 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
125 NLM_F_ACK, tunnel, cmd);
126
127 if (ret >= 0)
128 return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
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 return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
152
153 nlmsg_free(msg);
154
155 return ret;
156 }
157
158 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
159 {
160 u32 tunnel_id;
161 u32 peer_tunnel_id;
162 int proto_version;
163 int fd;
164 int ret = 0;
165 struct l2tp_tunnel_cfg cfg = { 0, };
166 struct l2tp_tunnel *tunnel;
167 struct net *net = genl_info_net(info);
168
169 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
170 ret = -EINVAL;
171 goto out;
172 }
173 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
174
175 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
176 ret = -EINVAL;
177 goto out;
178 }
179 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
180
181 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
182 ret = -EINVAL;
183 goto out;
184 }
185 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
186
187 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
188 ret = -EINVAL;
189 goto out;
190 }
191 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
192
193 fd = -1;
194 if (info->attrs[L2TP_ATTR_FD]) {
195 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
196 } else {
197 #if IS_ENABLED(CONFIG_IPV6)
198 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
199 info->attrs[L2TP_ATTR_IP6_DADDR]) {
200 cfg.local_ip6 = nla_data(
201 info->attrs[L2TP_ATTR_IP6_SADDR]);
202 cfg.peer_ip6 = nla_data(
203 info->attrs[L2TP_ATTR_IP6_DADDR]);
204 } else
205 #endif
206 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
207 info->attrs[L2TP_ATTR_IP_DADDR]) {
208 cfg.local_ip.s_addr = nla_get_in_addr(
209 info->attrs[L2TP_ATTR_IP_SADDR]);
210 cfg.peer_ip.s_addr = nla_get_in_addr(
211 info->attrs[L2TP_ATTR_IP_DADDR]);
212 } else {
213 ret = -EINVAL;
214 goto out;
215 }
216 if (info->attrs[L2TP_ATTR_UDP_SPORT])
217 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
218 if (info->attrs[L2TP_ATTR_UDP_DPORT])
219 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
220 if (info->attrs[L2TP_ATTR_UDP_CSUM])
221 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
222
223 #if IS_ENABLED(CONFIG_IPV6)
224 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX])
225 cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
226 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX])
227 cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
228 #endif
229 }
230
231 if (info->attrs[L2TP_ATTR_DEBUG])
232 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
233
234 tunnel = l2tp_tunnel_find(net, tunnel_id);
235 if (tunnel != NULL) {
236 ret = -EEXIST;
237 goto out;
238 }
239
240 ret = -EINVAL;
241 switch (cfg.encap) {
242 case L2TP_ENCAPTYPE_UDP:
243 case L2TP_ENCAPTYPE_IP:
244 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
245 peer_tunnel_id, &cfg, &tunnel);
246 break;
247 }
248
249 if (ret >= 0)
250 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
251 tunnel, L2TP_CMD_TUNNEL_CREATE);
252 out:
253 return ret;
254 }
255
256 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
257 {
258 struct l2tp_tunnel *tunnel;
259 u32 tunnel_id;
260 int ret = 0;
261 struct net *net = genl_info_net(info);
262
263 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
264 ret = -EINVAL;
265 goto out;
266 }
267 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
268
269 tunnel = l2tp_tunnel_find(net, tunnel_id);
270 if (tunnel == NULL) {
271 ret = -ENODEV;
272 goto out;
273 }
274
275 l2tp_tunnel_notify(&l2tp_nl_family, info,
276 tunnel, L2TP_CMD_TUNNEL_DELETE);
277
278 (void) l2tp_tunnel_delete(tunnel);
279
280 out:
281 return ret;
282 }
283
284 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
285 {
286 struct l2tp_tunnel *tunnel;
287 u32 tunnel_id;
288 int ret = 0;
289 struct net *net = genl_info_net(info);
290
291 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
292 ret = -EINVAL;
293 goto out;
294 }
295 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
296
297 tunnel = l2tp_tunnel_find(net, tunnel_id);
298 if (tunnel == NULL) {
299 ret = -ENODEV;
300 goto out;
301 }
302
303 if (info->attrs[L2TP_ATTR_DEBUG])
304 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
305
306 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
307 tunnel, L2TP_CMD_TUNNEL_MODIFY);
308
309 out:
310 return ret;
311 }
312
313 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
314 struct l2tp_tunnel *tunnel, u8 cmd)
315 {
316 void *hdr;
317 struct nlattr *nest;
318 struct sock *sk = NULL;
319 struct inet_sock *inet;
320 #if IS_ENABLED(CONFIG_IPV6)
321 struct ipv6_pinfo *np = NULL;
322 #endif
323
324 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
325 if (!hdr)
326 return -EMSGSIZE;
327
328 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
329 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
330 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
331 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
332 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
333 goto nla_put_failure;
334
335 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
336 if (nest == NULL)
337 goto nla_put_failure;
338
339 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
340 atomic_long_read(&tunnel->stats.tx_packets)) ||
341 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
342 atomic_long_read(&tunnel->stats.tx_bytes)) ||
343 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
344 atomic_long_read(&tunnel->stats.tx_errors)) ||
345 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
346 atomic_long_read(&tunnel->stats.rx_packets)) ||
347 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
348 atomic_long_read(&tunnel->stats.rx_bytes)) ||
349 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
350 atomic_long_read(&tunnel->stats.rx_seq_discards)) ||
351 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
352 atomic_long_read(&tunnel->stats.rx_oos_packets)) ||
353 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
354 atomic_long_read(&tunnel->stats.rx_errors)))
355 goto nla_put_failure;
356 nla_nest_end(skb, nest);
357
358 sk = tunnel->sock;
359 if (!sk)
360 goto out;
361
362 #if IS_ENABLED(CONFIG_IPV6)
363 if (sk->sk_family == AF_INET6)
364 np = inet6_sk(sk);
365 #endif
366
367 inet = inet_sk(sk);
368
369 switch (tunnel->encap) {
370 case L2TP_ENCAPTYPE_UDP:
371 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
372 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
373 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
374 goto nla_put_failure;
375 /* NOBREAK */
376 case L2TP_ENCAPTYPE_IP:
377 #if IS_ENABLED(CONFIG_IPV6)
378 if (np) {
379 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
380 &np->saddr) ||
381 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
382 &sk->sk_v6_daddr))
383 goto nla_put_failure;
384 } else
385 #endif
386 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
387 inet->inet_saddr) ||
388 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
389 inet->inet_daddr))
390 goto nla_put_failure;
391 break;
392 }
393
394 out:
395 genlmsg_end(skb, hdr);
396 return 0;
397
398 nla_put_failure:
399 genlmsg_cancel(skb, hdr);
400 return -1;
401 }
402
403 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
404 {
405 struct l2tp_tunnel *tunnel;
406 struct sk_buff *msg;
407 u32 tunnel_id;
408 int ret = -ENOBUFS;
409 struct net *net = genl_info_net(info);
410
411 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
412 ret = -EINVAL;
413 goto out;
414 }
415
416 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
417
418 tunnel = l2tp_tunnel_find(net, tunnel_id);
419 if (tunnel == NULL) {
420 ret = -ENODEV;
421 goto out;
422 }
423
424 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
425 if (!msg) {
426 ret = -ENOMEM;
427 goto out;
428 }
429
430 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
431 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
432 if (ret < 0)
433 goto err_out;
434
435 return genlmsg_unicast(net, msg, info->snd_portid);
436
437 err_out:
438 nlmsg_free(msg);
439
440 out:
441 return ret;
442 }
443
444 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
445 {
446 int ti = cb->args[0];
447 struct l2tp_tunnel *tunnel;
448 struct net *net = sock_net(skb->sk);
449
450 for (;;) {
451 tunnel = l2tp_tunnel_find_nth(net, ti);
452 if (tunnel == NULL)
453 goto out;
454
455 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
456 cb->nlh->nlmsg_seq, NLM_F_MULTI,
457 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
458 goto out;
459
460 ti++;
461 }
462
463 out:
464 cb->args[0] = ti;
465
466 return skb->len;
467 }
468
469 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
470 {
471 u32 tunnel_id = 0;
472 u32 session_id;
473 u32 peer_session_id;
474 int ret = 0;
475 struct l2tp_tunnel *tunnel;
476 struct l2tp_session *session;
477 struct l2tp_session_cfg cfg = { 0, };
478 struct net *net = genl_info_net(info);
479
480 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
481 ret = -EINVAL;
482 goto out;
483 }
484 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
485 tunnel = l2tp_tunnel_find(net, tunnel_id);
486 if (!tunnel) {
487 ret = -ENODEV;
488 goto out;
489 }
490
491 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
492 ret = -EINVAL;
493 goto out;
494 }
495 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
496 session = l2tp_session_find(net, tunnel, session_id);
497 if (session) {
498 ret = -EEXIST;
499 goto out;
500 }
501
502 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
503 ret = -EINVAL;
504 goto out;
505 }
506 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
507
508 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
509 ret = -EINVAL;
510 goto out;
511 }
512 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
513 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
514 ret = -EINVAL;
515 goto out;
516 }
517
518 if (tunnel->version > 2) {
519 if (info->attrs[L2TP_ATTR_OFFSET])
520 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
521
522 if (info->attrs[L2TP_ATTR_DATA_SEQ])
523 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
524
525 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
526 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
527 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
528
529 cfg.l2specific_len = 4;
530 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
531 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
532
533 if (info->attrs[L2TP_ATTR_COOKIE]) {
534 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
535 if (len > 8) {
536 ret = -EINVAL;
537 goto out;
538 }
539 cfg.cookie_len = len;
540 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
541 }
542 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
543 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
544 if (len > 8) {
545 ret = -EINVAL;
546 goto out;
547 }
548 cfg.peer_cookie_len = len;
549 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
550 }
551 if (info->attrs[L2TP_ATTR_IFNAME])
552 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
553
554 if (info->attrs[L2TP_ATTR_VLAN_ID])
555 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
556 }
557
558 if (info->attrs[L2TP_ATTR_DEBUG])
559 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
560
561 if (info->attrs[L2TP_ATTR_RECV_SEQ])
562 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
563
564 if (info->attrs[L2TP_ATTR_SEND_SEQ])
565 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
566
567 if (info->attrs[L2TP_ATTR_LNS_MODE])
568 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
569
570 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
571 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
572
573 if (info->attrs[L2TP_ATTR_MTU])
574 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
575
576 if (info->attrs[L2TP_ATTR_MRU])
577 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
578
579 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
580 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
581 ret = -EPROTONOSUPPORT;
582 goto out;
583 }
584
585 /* Check that pseudowire-specific params are present */
586 switch (cfg.pw_type) {
587 case L2TP_PWTYPE_NONE:
588 break;
589 case L2TP_PWTYPE_ETH_VLAN:
590 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
591 ret = -EINVAL;
592 goto out;
593 }
594 break;
595 case L2TP_PWTYPE_ETH:
596 break;
597 case L2TP_PWTYPE_PPP:
598 case L2TP_PWTYPE_PPP_AC:
599 break;
600 case L2TP_PWTYPE_IP:
601 default:
602 ret = -EPROTONOSUPPORT;
603 break;
604 }
605
606 ret = -EPROTONOSUPPORT;
607 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
608 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
609 session_id, peer_session_id, &cfg);
610
611 if (ret >= 0) {
612 session = l2tp_session_find(net, tunnel, session_id);
613 if (session)
614 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
615 L2TP_CMD_SESSION_CREATE);
616 }
617
618 out:
619 return ret;
620 }
621
622 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
623 {
624 int ret = 0;
625 struct l2tp_session *session;
626 u16 pw_type;
627
628 session = l2tp_nl_session_find(info);
629 if (session == NULL) {
630 ret = -ENODEV;
631 goto out;
632 }
633
634 l2tp_session_notify(&l2tp_nl_family, info,
635 session, L2TP_CMD_SESSION_DELETE);
636
637 pw_type = session->pwtype;
638 if (pw_type < __L2TP_PWTYPE_MAX)
639 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
640 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
641
642 out:
643 return ret;
644 }
645
646 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
647 {
648 int ret = 0;
649 struct l2tp_session *session;
650
651 session = l2tp_nl_session_find(info);
652 if (session == NULL) {
653 ret = -ENODEV;
654 goto out;
655 }
656
657 if (info->attrs[L2TP_ATTR_DEBUG])
658 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
659
660 if (info->attrs[L2TP_ATTR_DATA_SEQ])
661 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
662
663 if (info->attrs[L2TP_ATTR_RECV_SEQ])
664 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
665
666 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
667 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
668 l2tp_session_set_header_len(session, session->tunnel->version);
669 }
670
671 if (info->attrs[L2TP_ATTR_LNS_MODE])
672 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
673
674 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
675 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
676
677 if (info->attrs[L2TP_ATTR_MTU])
678 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
679
680 if (info->attrs[L2TP_ATTR_MRU])
681 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
682
683 ret = l2tp_session_notify(&l2tp_nl_family, info,
684 session, L2TP_CMD_SESSION_MODIFY);
685
686 out:
687 return ret;
688 }
689
690 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
691 struct l2tp_session *session, u8 cmd)
692 {
693 void *hdr;
694 struct nlattr *nest;
695 struct l2tp_tunnel *tunnel = session->tunnel;
696 struct sock *sk = NULL;
697
698 sk = tunnel->sock;
699
700 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
701 if (!hdr)
702 return -EMSGSIZE;
703
704 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
705 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
706 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
707 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
708 session->peer_session_id) ||
709 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
710 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
711 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
712 (session->mru &&
713 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
714 goto nla_put_failure;
715
716 if ((session->ifname[0] &&
717 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
718 (session->cookie_len &&
719 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
720 &session->cookie[0])) ||
721 (session->peer_cookie_len &&
722 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
723 &session->peer_cookie[0])) ||
724 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
725 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
726 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
727 #ifdef CONFIG_XFRM
728 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
729 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
730 #endif
731 (session->reorder_timeout &&
732 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
733 goto nla_put_failure;
734
735 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
736 if (nest == NULL)
737 goto nla_put_failure;
738
739 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
740 atomic_long_read(&session->stats.tx_packets)) ||
741 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
742 atomic_long_read(&session->stats.tx_bytes)) ||
743 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
744 atomic_long_read(&session->stats.tx_errors)) ||
745 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
746 atomic_long_read(&session->stats.rx_packets)) ||
747 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
748 atomic_long_read(&session->stats.rx_bytes)) ||
749 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
750 atomic_long_read(&session->stats.rx_seq_discards)) ||
751 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
752 atomic_long_read(&session->stats.rx_oos_packets)) ||
753 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
754 atomic_long_read(&session->stats.rx_errors)))
755 goto nla_put_failure;
756 nla_nest_end(skb, nest);
757
758 genlmsg_end(skb, hdr);
759 return 0;
760
761 nla_put_failure:
762 genlmsg_cancel(skb, hdr);
763 return -1;
764 }
765
766 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
767 {
768 struct l2tp_session *session;
769 struct sk_buff *msg;
770 int ret;
771
772 session = l2tp_nl_session_find(info);
773 if (session == NULL) {
774 ret = -ENODEV;
775 goto out;
776 }
777
778 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
779 if (!msg) {
780 ret = -ENOMEM;
781 goto out;
782 }
783
784 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
785 0, session, L2TP_CMD_SESSION_GET);
786 if (ret < 0)
787 goto err_out;
788
789 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
790
791 err_out:
792 nlmsg_free(msg);
793
794 out:
795 return ret;
796 }
797
798 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
799 {
800 struct net *net = sock_net(skb->sk);
801 struct l2tp_session *session;
802 struct l2tp_tunnel *tunnel = NULL;
803 int ti = cb->args[0];
804 int si = cb->args[1];
805
806 for (;;) {
807 if (tunnel == NULL) {
808 tunnel = l2tp_tunnel_find_nth(net, ti);
809 if (tunnel == NULL)
810 goto out;
811 }
812
813 session = l2tp_session_find_nth(tunnel, si);
814 if (session == NULL) {
815 ti++;
816 tunnel = NULL;
817 si = 0;
818 continue;
819 }
820
821 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
822 cb->nlh->nlmsg_seq, NLM_F_MULTI,
823 session, L2TP_CMD_SESSION_GET) < 0)
824 break;
825
826 si++;
827 }
828
829 out:
830 cb->args[0] = ti;
831 cb->args[1] = si;
832
833 return skb->len;
834 }
835
836 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
837 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
838 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
839 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
840 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
841 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
842 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
843 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
844 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
845 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
846 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
847 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
848 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
849 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
850 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
851 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
852 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
853 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
854 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
855 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
856 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
857 [L2TP_ATTR_FD] = { .type = NLA_U32, },
858 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
859 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
860 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
861 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
862 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
863 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
864 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
865 [L2TP_ATTR_IP6_SADDR] = {
866 .type = NLA_BINARY,
867 .len = sizeof(struct in6_addr),
868 },
869 [L2TP_ATTR_IP6_DADDR] = {
870 .type = NLA_BINARY,
871 .len = sizeof(struct in6_addr),
872 },
873 [L2TP_ATTR_IFNAME] = {
874 .type = NLA_NUL_STRING,
875 .len = IFNAMSIZ - 1,
876 },
877 [L2TP_ATTR_COOKIE] = {
878 .type = NLA_BINARY,
879 .len = 8,
880 },
881 [L2TP_ATTR_PEER_COOKIE] = {
882 .type = NLA_BINARY,
883 .len = 8,
884 },
885 };
886
887 static const struct genl_ops l2tp_nl_ops[] = {
888 {
889 .cmd = L2TP_CMD_NOOP,
890 .doit = l2tp_nl_cmd_noop,
891 .policy = l2tp_nl_policy,
892 /* can be retrieved by unprivileged users */
893 },
894 {
895 .cmd = L2TP_CMD_TUNNEL_CREATE,
896 .doit = l2tp_nl_cmd_tunnel_create,
897 .policy = l2tp_nl_policy,
898 .flags = GENL_ADMIN_PERM,
899 },
900 {
901 .cmd = L2TP_CMD_TUNNEL_DELETE,
902 .doit = l2tp_nl_cmd_tunnel_delete,
903 .policy = l2tp_nl_policy,
904 .flags = GENL_ADMIN_PERM,
905 },
906 {
907 .cmd = L2TP_CMD_TUNNEL_MODIFY,
908 .doit = l2tp_nl_cmd_tunnel_modify,
909 .policy = l2tp_nl_policy,
910 .flags = GENL_ADMIN_PERM,
911 },
912 {
913 .cmd = L2TP_CMD_TUNNEL_GET,
914 .doit = l2tp_nl_cmd_tunnel_get,
915 .dumpit = l2tp_nl_cmd_tunnel_dump,
916 .policy = l2tp_nl_policy,
917 .flags = GENL_ADMIN_PERM,
918 },
919 {
920 .cmd = L2TP_CMD_SESSION_CREATE,
921 .doit = l2tp_nl_cmd_session_create,
922 .policy = l2tp_nl_policy,
923 .flags = GENL_ADMIN_PERM,
924 },
925 {
926 .cmd = L2TP_CMD_SESSION_DELETE,
927 .doit = l2tp_nl_cmd_session_delete,
928 .policy = l2tp_nl_policy,
929 .flags = GENL_ADMIN_PERM,
930 },
931 {
932 .cmd = L2TP_CMD_SESSION_MODIFY,
933 .doit = l2tp_nl_cmd_session_modify,
934 .policy = l2tp_nl_policy,
935 .flags = GENL_ADMIN_PERM,
936 },
937 {
938 .cmd = L2TP_CMD_SESSION_GET,
939 .doit = l2tp_nl_cmd_session_get,
940 .dumpit = l2tp_nl_cmd_session_dump,
941 .policy = l2tp_nl_policy,
942 .flags = GENL_ADMIN_PERM,
943 },
944 };
945
946 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
947 {
948 int ret;
949
950 ret = -EINVAL;
951 if (pw_type >= __L2TP_PWTYPE_MAX)
952 goto err;
953
954 genl_lock();
955 ret = -EBUSY;
956 if (l2tp_nl_cmd_ops[pw_type])
957 goto out;
958
959 l2tp_nl_cmd_ops[pw_type] = ops;
960 ret = 0;
961
962 out:
963 genl_unlock();
964 err:
965 return ret;
966 }
967 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
968
969 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
970 {
971 if (pw_type < __L2TP_PWTYPE_MAX) {
972 genl_lock();
973 l2tp_nl_cmd_ops[pw_type] = NULL;
974 genl_unlock();
975 }
976 }
977 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
978
979 static int l2tp_nl_init(void)
980 {
981 pr_info("L2TP netlink interface\n");
982 return genl_register_family_with_ops_groups(&l2tp_nl_family,
983 l2tp_nl_ops,
984 l2tp_multicast_group);
985 }
986
987 static void l2tp_nl_cleanup(void)
988 {
989 genl_unregister_family(&l2tp_nl_family);
990 }
991
992 module_init(l2tp_nl_init);
993 module_exit(l2tp_nl_cleanup);
994
995 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
996 MODULE_DESCRIPTION("L2TP netlink");
997 MODULE_LICENSE("GPL");
998 MODULE_VERSION("1.0");
999 MODULE_ALIAS_GENL_FAMILY("l2tp");
Linux with added FPC-III support