aboutsummaryrefslogtreecommitdiffstats
path: root/net/l2tp/l2tp_netlink.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/l2tp/l2tp_netlink.c')
-rw-r--r--net/l2tp/l2tp_netlink.c840
1 files changed, 840 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
new file mode 100644
index 000000000000..4c1e540732d7
--- /dev/null
+++ b/net/l2tp/l2tp_netlink.c
@@ -0,0 +1,840 @@
1/*
2 * L2TP netlink layer, for management
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
6 * Partly based on the IrDA nelink implementation
7 * (see net/irda/irnetlink.c) which is:
8 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
9 * which is in turn partly based on the wireless netlink code:
10 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <net/sock.h>
18#include <net/genetlink.h>
19#include <net/udp.h>
20#include <linux/in.h>
21#include <linux/udp.h>
22#include <linux/socket.h>
23#include <linux/module.h>
24#include <linux/list.h>
25#include <net/net_namespace.h>
26
27#include <linux/l2tp.h>
28
29#include "l2tp_core.h"
30
31
32static struct genl_family l2tp_nl_family = {
33 .id = GENL_ID_GENERATE,
34 .name = L2TP_GENL_NAME,
35 .version = L2TP_GENL_VERSION,
36 .hdrsize = 0,
37 .maxattr = L2TP_ATTR_MAX,
38};
39
40/* Accessed under genl lock */
41static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
42
43static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
44{
45 u32 tunnel_id;
46 u32 session_id;
47 char *ifname;
48 struct l2tp_tunnel *tunnel;
49 struct l2tp_session *session = NULL;
50 struct net *net = genl_info_net(info);
51
52 if (info->attrs[L2TP_ATTR_IFNAME]) {
53 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
54 session = l2tp_session_find_by_ifname(net, ifname);
55 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
56 (info->attrs[L2TP_ATTR_CONN_ID])) {
57 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
58 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
59 tunnel = l2tp_tunnel_find(net, tunnel_id);
60 if (tunnel)
61 session = l2tp_session_find(net, tunnel, session_id);
62 }
63
64 return session;
65}
66
67static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
68{
69 struct sk_buff *msg;
70 void *hdr;
71 int ret = -ENOBUFS;
72
73 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
74 if (!msg) {
75 ret = -ENOMEM;
76 goto out;
77 }
78
79 hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
80 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
81 if (IS_ERR(hdr)) {
82 ret = PTR_ERR(hdr);
83 goto err_out;
84 }
85
86 genlmsg_end(msg, hdr);
87
88 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
89
90err_out:
91 nlmsg_free(msg);
92
93out:
94 return ret;
95}
96
97static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
98{
99 u32 tunnel_id;
100 u32 peer_tunnel_id;
101 int proto_version;
102 int fd;
103 int ret = 0;
104 struct l2tp_tunnel_cfg cfg = { 0, };
105 struct l2tp_tunnel *tunnel;
106 struct net *net = genl_info_net(info);
107
108 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
109 ret = -EINVAL;
110 goto out;
111 }
112 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
113
114 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
115 ret = -EINVAL;
116 goto out;
117 }
118 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
119
120 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
121 ret = -EINVAL;
122 goto out;
123 }
124 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
125
126 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
127 ret = -EINVAL;
128 goto out;
129 }
130 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
131
132 fd = -1;
133 if (info->attrs[L2TP_ATTR_FD]) {
134 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
135 } else {
136 if (info->attrs[L2TP_ATTR_IP_SADDR])
137 cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]);
138 if (info->attrs[L2TP_ATTR_IP_DADDR])
139 cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]);
140 if (info->attrs[L2TP_ATTR_UDP_SPORT])
141 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
142 if (info->attrs[L2TP_ATTR_UDP_DPORT])
143 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
144 if (info->attrs[L2TP_ATTR_UDP_CSUM])
145 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
146 }
147
148 if (info->attrs[L2TP_ATTR_DEBUG])
149 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
150
151 tunnel = l2tp_tunnel_find(net, tunnel_id);
152 if (tunnel != NULL) {
153 ret = -EEXIST;
154 goto out;
155 }
156
157 ret = -EINVAL;
158 switch (cfg.encap) {
159 case L2TP_ENCAPTYPE_UDP:
160 case L2TP_ENCAPTYPE_IP:
161 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
162 peer_tunnel_id, &cfg, &tunnel);
163 break;
164 }
165
166out:
167 return ret;
168}
169
170static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
171{
172 struct l2tp_tunnel *tunnel;
173 u32 tunnel_id;
174 int ret = 0;
175 struct net *net = genl_info_net(info);
176
177 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
178 ret = -EINVAL;
179 goto out;
180 }
181 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
182
183 tunnel = l2tp_tunnel_find(net, tunnel_id);
184 if (tunnel == NULL) {
185 ret = -ENODEV;
186 goto out;
187 }
188
189 (void) l2tp_tunnel_delete(tunnel);
190
191out:
192 return ret;
193}
194
195static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
196{
197 struct l2tp_tunnel *tunnel;
198 u32 tunnel_id;
199 int ret = 0;
200 struct net *net = genl_info_net(info);
201
202 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
203 ret = -EINVAL;
204 goto out;
205 }
206 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
207
208 tunnel = l2tp_tunnel_find(net, tunnel_id);
209 if (tunnel == NULL) {
210 ret = -ENODEV;
211 goto out;
212 }
213
214 if (info->attrs[L2TP_ATTR_DEBUG])
215 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
216
217out:
218 return ret;
219}
220
221static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
222 struct l2tp_tunnel *tunnel)
223{
224 void *hdr;
225 struct nlattr *nest;
226 struct sock *sk = NULL;
227 struct inet_sock *inet;
228
229 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
230 L2TP_CMD_TUNNEL_GET);
231 if (IS_ERR(hdr))
232 return PTR_ERR(hdr);
233
234 NLA_PUT_U8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version);
235 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
236 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
237 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, tunnel->debug);
238 NLA_PUT_U16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap);
239
240 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
241 if (nest == NULL)
242 goto nla_put_failure;
243
244 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets);
245 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes);
246 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors);
247 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets);
248 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes);
249 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, tunnel->stats.rx_seq_discards);
250 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, tunnel->stats.rx_oos_packets);
251 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors);
252 nla_nest_end(skb, nest);
253
254 sk = tunnel->sock;
255 if (!sk)
256 goto out;
257
258 inet = inet_sk(sk);
259
260 switch (tunnel->encap) {
261 case L2TP_ENCAPTYPE_UDP:
262 NLA_PUT_U16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport));
263 NLA_PUT_U16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport));
264 NLA_PUT_U8(skb, L2TP_ATTR_UDP_CSUM, (sk->sk_no_check != UDP_CSUM_NOXMIT));
265 /* NOBREAK */
266 case L2TP_ENCAPTYPE_IP:
267 NLA_PUT_BE32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr);
268 NLA_PUT_BE32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr);
269 break;
270 }
271
272out:
273 return genlmsg_end(skb, hdr);
274
275nla_put_failure:
276 genlmsg_cancel(skb, hdr);
277 return -1;
278}
279
280static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
281{
282 struct l2tp_tunnel *tunnel;
283 struct sk_buff *msg;
284 u32 tunnel_id;
285 int ret = -ENOBUFS;
286 struct net *net = genl_info_net(info);
287
288 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
289 ret = -EINVAL;
290 goto out;
291 }
292
293 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
294
295 tunnel = l2tp_tunnel_find(net, tunnel_id);
296 if (tunnel == NULL) {
297 ret = -ENODEV;
298 goto out;
299 }
300
301 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
302 if (!msg) {
303 ret = -ENOMEM;
304 goto out;
305 }
306
307 ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
308 NLM_F_ACK, tunnel);
309 if (ret < 0)
310 goto err_out;
311
312 return genlmsg_unicast(net, msg, info->snd_pid);
313
314err_out:
315 nlmsg_free(msg);
316
317out:
318 return ret;
319}
320
321static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
322{
323 int ti = cb->args[0];
324 struct l2tp_tunnel *tunnel;
325 struct net *net = sock_net(skb->sk);
326
327 for (;;) {
328 tunnel = l2tp_tunnel_find_nth(net, ti);
329 if (tunnel == NULL)
330 goto out;
331
332 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
333 cb->nlh->nlmsg_seq, NLM_F_MULTI,
334 tunnel) <= 0)
335 goto out;
336
337 ti++;
338 }
339
340out:
341 cb->args[0] = ti;
342
343 return skb->len;
344}
345
346static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
347{
348 u32 tunnel_id = 0;
349 u32 session_id;
350 u32 peer_session_id;
351 int ret = 0;
352 struct l2tp_tunnel *tunnel;
353 struct l2tp_session *session;
354 struct l2tp_session_cfg cfg = { 0, };
355 struct net *net = genl_info_net(info);
356
357 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
358 ret = -EINVAL;
359 goto out;
360 }
361 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
362 tunnel = l2tp_tunnel_find(net, tunnel_id);
363 if (!tunnel) {
364 ret = -ENODEV;
365 goto out;
366 }
367
368 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
369 ret = -EINVAL;
370 goto out;
371 }
372 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
373 session = l2tp_session_find(net, tunnel, session_id);
374 if (session) {
375 ret = -EEXIST;
376 goto out;
377 }
378
379 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
380 ret = -EINVAL;
381 goto out;
382 }
383 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
384
385 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
386 ret = -EINVAL;
387 goto out;
388 }
389 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
390 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
391 ret = -EINVAL;
392 goto out;
393 }
394
395 if (tunnel->version > 2) {
396 if (info->attrs[L2TP_ATTR_OFFSET])
397 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
398
399 if (info->attrs[L2TP_ATTR_DATA_SEQ])
400 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
401
402 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
403 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
404 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
405
406 cfg.l2specific_len = 4;
407 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
408 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
409
410 if (info->attrs[L2TP_ATTR_COOKIE]) {
411 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
412 if (len > 8) {
413 ret = -EINVAL;
414 goto out;
415 }
416 cfg.cookie_len = len;
417 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
418 }
419 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
420 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
421 if (len > 8) {
422 ret = -EINVAL;
423 goto out;
424 }
425 cfg.peer_cookie_len = len;
426 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
427 }
428 if (info->attrs[L2TP_ATTR_IFNAME])
429 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
430
431 if (info->attrs[L2TP_ATTR_VLAN_ID])
432 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
433 }
434
435 if (info->attrs[L2TP_ATTR_DEBUG])
436 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
437
438 if (info->attrs[L2TP_ATTR_RECV_SEQ])
439 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
440
441 if (info->attrs[L2TP_ATTR_SEND_SEQ])
442 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
443
444 if (info->attrs[L2TP_ATTR_LNS_MODE])
445 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
446
447 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
448 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
449
450 if (info->attrs[L2TP_ATTR_MTU])
451 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
452
453 if (info->attrs[L2TP_ATTR_MRU])
454 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
455
456 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
457 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
458 ret = -EPROTONOSUPPORT;
459 goto out;
460 }
461
462 /* Check that pseudowire-specific params are present */
463 switch (cfg.pw_type) {
464 case L2TP_PWTYPE_NONE:
465 break;
466 case L2TP_PWTYPE_ETH_VLAN:
467 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
468 ret = -EINVAL;
469 goto out;
470 }
471 break;
472 case L2TP_PWTYPE_ETH:
473 break;
474 case L2TP_PWTYPE_PPP:
475 case L2TP_PWTYPE_PPP_AC:
476 break;
477 case L2TP_PWTYPE_IP:
478 default:
479 ret = -EPROTONOSUPPORT;
480 break;
481 }
482
483 ret = -EPROTONOSUPPORT;
484 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
485 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
486 session_id, peer_session_id, &cfg);
487
488out:
489 return ret;
490}
491
492static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
493{
494 int ret = 0;
495 struct l2tp_session *session;
496 u16 pw_type;
497
498 session = l2tp_nl_session_find(info);
499 if (session == NULL) {
500 ret = -ENODEV;
501 goto out;
502 }
503
504 pw_type = session->pwtype;
505 if (pw_type < __L2TP_PWTYPE_MAX)
506 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
507 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
508
509out:
510 return ret;
511}
512
513static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
514{
515 int ret = 0;
516 struct l2tp_session *session;
517
518 session = l2tp_nl_session_find(info);
519 if (session == NULL) {
520 ret = -ENODEV;
521 goto out;
522 }
523
524 if (info->attrs[L2TP_ATTR_DEBUG])
525 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
526
527 if (info->attrs[L2TP_ATTR_DATA_SEQ])
528 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
529
530 if (info->attrs[L2TP_ATTR_RECV_SEQ])
531 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
532
533 if (info->attrs[L2TP_ATTR_SEND_SEQ])
534 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
535
536 if (info->attrs[L2TP_ATTR_LNS_MODE])
537 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
538
539 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
540 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
541
542 if (info->attrs[L2TP_ATTR_MTU])
543 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
544
545 if (info->attrs[L2TP_ATTR_MRU])
546 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
547
548out:
549 return ret;
550}
551
552static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
553 struct l2tp_session *session)
554{
555 void *hdr;
556 struct nlattr *nest;
557 struct l2tp_tunnel *tunnel = session->tunnel;
558 struct sock *sk = NULL;
559
560 sk = tunnel->sock;
561
562 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
563 if (IS_ERR(hdr))
564 return PTR_ERR(hdr);
565
566 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
567 NLA_PUT_U32(skb, L2TP_ATTR_SESSION_ID, session->session_id);
568 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
569 NLA_PUT_U32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
570 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, session->debug);
571 NLA_PUT_U16(skb, L2TP_ATTR_PW_TYPE, session->pwtype);
572 NLA_PUT_U16(skb, L2TP_ATTR_MTU, session->mtu);
573 if (session->mru)
574 NLA_PUT_U16(skb, L2TP_ATTR_MRU, session->mru);
575
576 if (session->ifname && session->ifname[0])
577 NLA_PUT_STRING(skb, L2TP_ATTR_IFNAME, session->ifname);
578 if (session->cookie_len)
579 NLA_PUT(skb, L2TP_ATTR_COOKIE, session->cookie_len, &session->cookie[0]);
580 if (session->peer_cookie_len)
581 NLA_PUT(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, &session->peer_cookie[0]);
582 NLA_PUT_U8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq);
583 NLA_PUT_U8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq);
584 NLA_PUT_U8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode);
585#ifdef CONFIG_XFRM
586 if ((sk) && (sk->sk_policy[0] || sk->sk_policy[1]))
587 NLA_PUT_U8(skb, L2TP_ATTR_USING_IPSEC, 1);
588#endif
589 if (session->reorder_timeout)
590 NLA_PUT_MSECS(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout);
591
592 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
593 if (nest == NULL)
594 goto nla_put_failure;
595 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets);
596 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes);
597 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors);
598 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets);
599 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes);
600 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, session->stats.rx_seq_discards);
601 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, session->stats.rx_oos_packets);
602 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors);
603 nla_nest_end(skb, nest);
604
605 return genlmsg_end(skb, hdr);
606
607 nla_put_failure:
608 genlmsg_cancel(skb, hdr);
609 return -1;
610}
611
612static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
613{
614 struct l2tp_session *session;
615 struct sk_buff *msg;
616 int ret;
617
618 session = l2tp_nl_session_find(info);
619 if (session == NULL) {
620 ret = -ENODEV;
621 goto out;
622 }
623
624 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
625 if (!msg) {
626 ret = -ENOMEM;
627 goto out;
628 }
629
630 ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
631 0, session);
632 if (ret < 0)
633 goto err_out;
634
635 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
636
637err_out:
638 nlmsg_free(msg);
639
640out:
641 return ret;
642}
643
644static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
645{
646 struct net *net = sock_net(skb->sk);
647 struct l2tp_session *session;
648 struct l2tp_tunnel *tunnel = NULL;
649 int ti = cb->args[0];
650 int si = cb->args[1];
651
652 for (;;) {
653 if (tunnel == NULL) {
654 tunnel = l2tp_tunnel_find_nth(net, ti);
655 if (tunnel == NULL)
656 goto out;
657 }
658
659 session = l2tp_session_find_nth(tunnel, si);
660 if (session == NULL) {
661 ti++;
662 tunnel = NULL;
663 si = 0;
664 continue;
665 }
666
667 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
668 cb->nlh->nlmsg_seq, NLM_F_MULTI,
669 session) <= 0)
670 break;
671
672 si++;
673 }
674
675out:
676 cb->args[0] = ti;
677 cb->args[1] = si;
678
679 return skb->len;
680}
681
682static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
683 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
684 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
685 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
686 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
687 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
688 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
689 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
690 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
691 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
692 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
693 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
694 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
695 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
696 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
697 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
698 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
699 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
700 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
701 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
702 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
703 [L2TP_ATTR_FD] = { .type = NLA_U32, },
704 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
705 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
706 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
707 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
708 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
709 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
710 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
711 [L2TP_ATTR_IFNAME] = {
712 .type = NLA_NUL_STRING,
713 .len = IFNAMSIZ - 1,
714 },
715 [L2TP_ATTR_COOKIE] = {
716 .type = NLA_BINARY,
717 .len = 8,
718 },
719 [L2TP_ATTR_PEER_COOKIE] = {
720 .type = NLA_BINARY,
721 .len = 8,
722 },
723};
724
725static struct genl_ops l2tp_nl_ops[] = {
726 {
727 .cmd = L2TP_CMD_NOOP,
728 .doit = l2tp_nl_cmd_noop,
729 .policy = l2tp_nl_policy,
730 /* can be retrieved by unprivileged users */
731 },
732 {
733 .cmd = L2TP_CMD_TUNNEL_CREATE,
734 .doit = l2tp_nl_cmd_tunnel_create,
735 .policy = l2tp_nl_policy,
736 .flags = GENL_ADMIN_PERM,
737 },
738 {
739 .cmd = L2TP_CMD_TUNNEL_DELETE,
740 .doit = l2tp_nl_cmd_tunnel_delete,
741 .policy = l2tp_nl_policy,
742 .flags = GENL_ADMIN_PERM,
743 },
744 {
745 .cmd = L2TP_CMD_TUNNEL_MODIFY,
746 .doit = l2tp_nl_cmd_tunnel_modify,
747 .policy = l2tp_nl_policy,
748 .flags = GENL_ADMIN_PERM,
749 },
750 {
751 .cmd = L2TP_CMD_TUNNEL_GET,
752 .doit = l2tp_nl_cmd_tunnel_get,
753 .dumpit = l2tp_nl_cmd_tunnel_dump,
754 .policy = l2tp_nl_policy,
755 .flags = GENL_ADMIN_PERM,
756 },
757 {
758 .cmd = L2TP_CMD_SESSION_CREATE,
759 .doit = l2tp_nl_cmd_session_create,
760 .policy = l2tp_nl_policy,
761 .flags = GENL_ADMIN_PERM,
762 },
763 {
764 .cmd = L2TP_CMD_SESSION_DELETE,
765 .doit = l2tp_nl_cmd_session_delete,
766 .policy = l2tp_nl_policy,
767 .flags = GENL_ADMIN_PERM,
768 },
769 {
770 .cmd = L2TP_CMD_SESSION_MODIFY,
771 .doit = l2tp_nl_cmd_session_modify,
772 .policy = l2tp_nl_policy,
773 .flags = GENL_ADMIN_PERM,
774 },
775 {
776 .cmd = L2TP_CMD_SESSION_GET,
777 .doit = l2tp_nl_cmd_session_get,
778 .dumpit = l2tp_nl_cmd_session_dump,
779 .policy = l2tp_nl_policy,
780 .flags = GENL_ADMIN_PERM,
781 },
782};
783
784int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
785{
786 int ret;
787
788 ret = -EINVAL;
789 if (pw_type >= __L2TP_PWTYPE_MAX)
790 goto err;
791
792 genl_lock();
793 ret = -EBUSY;
794 if (l2tp_nl_cmd_ops[pw_type])
795 goto out;
796
797 l2tp_nl_cmd_ops[pw_type] = ops;
798
799out:
800 genl_unlock();
801err:
802 return 0;
803}
804EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
805
806void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
807{
808 if (pw_type < __L2TP_PWTYPE_MAX) {
809 genl_lock();
810 l2tp_nl_cmd_ops[pw_type] = NULL;
811 genl_unlock();
812 }
813}
814EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
815
816static int l2tp_nl_init(void)
817{
818 int err;
819
820 printk(KERN_INFO "L2TP netlink interface\n");
821 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
822 ARRAY_SIZE(l2tp_nl_ops));
823
824 return err;
825}
826
827static void l2tp_nl_cleanup(void)
828{
829 genl_unregister_family(&l2tp_nl_family);
830}
831
832module_init(l2tp_nl_init);
833module_exit(l2tp_nl_cleanup);
834
835MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
836MODULE_DESCRIPTION("L2TP netlink");
837MODULE_LICENSE("GPL");
838MODULE_VERSION("1.0");
839MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
840 __stringify(NETLINK_GENERIC) "-type-" "l2tp");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-07 14:54:17 -0500