l2tp: Add missing semicolon to MODULE_ALIAS() in l2tp_netlink.c
[linux-2.6.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 #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
32 static 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 */
41 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
42
43 static 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
67 static 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
90 err_out:
91         nlmsg_free(msg);
92
93 out:
94         return ret;
95 }
96
97 static 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
166 out:
167         return ret;
168 }
169
170 static 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
191 out:
192         return ret;
193 }
194
195 static 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
217 out:
218         return ret;
219 }
220
221 static 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
272 out:
273         return genlmsg_end(skb, hdr);
274
275 nla_put_failure:
276         genlmsg_cancel(skb, hdr);
277         return -1;
278 }
279
280 static 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
314 err_out:
315         nlmsg_free(msg);
316
317 out:
318         return ret;
319 }
320
321 static 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
340 out:
341         cb->args[0] = ti;
342
343         return skb->len;
344 }
345
346 static 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
488 out:
489         return ret;
490 }
491
492 static 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
509 out:
510         return ret;
511 }
512
513 static 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
548 out:
549         return ret;
550 }
551
552 static 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
612 static 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
637 err_out:
638         nlmsg_free(msg);
639
640 out:
641         return ret;
642 }
643
644 static 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
675 out:
676         cb->args[0] = ti;
677         cb->args[1] = si;
678
679         return skb->len;
680 }
681
682 static 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
725 static 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
784 int 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
799 out:
800         genl_unlock();
801 err:
802         return 0;
803 }
804 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
805
806 void 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 }
814 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
815
816 static 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
827 static void l2tp_nl_cleanup(void)
828 {
829         genl_unregister_family(&l2tp_nl_family);
830 }
831
832 module_init(l2tp_nl_init);
833 module_exit(l2tp_nl_cleanup);
834
835 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
836 MODULE_DESCRIPTION("L2TP netlink");
837 MODULE_LICENSE("GPL");
838 MODULE_VERSION("1.0");
839 MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
840              __stringify(NETLINK_GENERIC) "-type-" "l2tp");