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Merge tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jwess...
[karo-tx-linux.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         .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_be32(
209                                 info->attrs[L2TP_ATTR_IP_SADDR]);
210                         cfg.peer_ip.s_addr = nla_get_be32(
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(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
380                                     &np->saddr) ||
381                             nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(sk->sk_v6_daddr),
382                                     &sk->sk_v6_daddr))
383                                 goto nla_put_failure;
384                 } else
385 #endif
386                 if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
387                     nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
388                         goto nla_put_failure;
389                 break;
390         }
391
392 out:
393         genlmsg_end(skb, hdr);
394         return 0;
395
396 nla_put_failure:
397         genlmsg_cancel(skb, hdr);
398         return -1;
399 }
400
401 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
402 {
403         struct l2tp_tunnel *tunnel;
404         struct sk_buff *msg;
405         u32 tunnel_id;
406         int ret = -ENOBUFS;
407         struct net *net = genl_info_net(info);
408
409         if (!info->attrs[L2TP_ATTR_CONN_ID]) {
410                 ret = -EINVAL;
411                 goto out;
412         }
413
414         tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
415
416         tunnel = l2tp_tunnel_find(net, tunnel_id);
417         if (tunnel == NULL) {
418                 ret = -ENODEV;
419                 goto out;
420         }
421
422         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
423         if (!msg) {
424                 ret = -ENOMEM;
425                 goto out;
426         }
427
428         ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
429                                   NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
430         if (ret < 0)
431                 goto err_out;
432
433         return genlmsg_unicast(net, msg, info->snd_portid);
434
435 err_out:
436         nlmsg_free(msg);
437
438 out:
439         return ret;
440 }
441
442 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
443 {
444         int ti = cb->args[0];
445         struct l2tp_tunnel *tunnel;
446         struct net *net = sock_net(skb->sk);
447
448         for (;;) {
449                 tunnel = l2tp_tunnel_find_nth(net, ti);
450                 if (tunnel == NULL)
451                         goto out;
452
453                 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
454                                         cb->nlh->nlmsg_seq, NLM_F_MULTI,
455                                         tunnel, L2TP_CMD_TUNNEL_GET) < 0)
456                         goto out;
457
458                 ti++;
459         }
460
461 out:
462         cb->args[0] = ti;
463
464         return skb->len;
465 }
466
467 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
468 {
469         u32 tunnel_id = 0;
470         u32 session_id;
471         u32 peer_session_id;
472         int ret = 0;
473         struct l2tp_tunnel *tunnel;
474         struct l2tp_session *session;
475         struct l2tp_session_cfg cfg = { 0, };
476         struct net *net = genl_info_net(info);
477
478         if (!info->attrs[L2TP_ATTR_CONN_ID]) {
479                 ret = -EINVAL;
480                 goto out;
481         }
482         tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
483         tunnel = l2tp_tunnel_find(net, tunnel_id);
484         if (!tunnel) {
485                 ret = -ENODEV;
486                 goto out;
487         }
488
489         if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
490                 ret = -EINVAL;
491                 goto out;
492         }
493         session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
494         session = l2tp_session_find(net, tunnel, session_id);
495         if (session) {
496                 ret = -EEXIST;
497                 goto out;
498         }
499
500         if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
501                 ret = -EINVAL;
502                 goto out;
503         }
504         peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
505
506         if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
507                 ret = -EINVAL;
508                 goto out;
509         }
510         cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
511         if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
512                 ret = -EINVAL;
513                 goto out;
514         }
515
516         if (tunnel->version > 2) {
517                 if (info->attrs[L2TP_ATTR_OFFSET])
518                         cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
519
520                 if (info->attrs[L2TP_ATTR_DATA_SEQ])
521                         cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
522
523                 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
524                 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
525                         cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
526
527                 cfg.l2specific_len = 4;
528                 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
529                         cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
530
531                 if (info->attrs[L2TP_ATTR_COOKIE]) {
532                         u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
533                         if (len > 8) {
534                                 ret = -EINVAL;
535                                 goto out;
536                         }
537                         cfg.cookie_len = len;
538                         memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
539                 }
540                 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
541                         u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
542                         if (len > 8) {
543                                 ret = -EINVAL;
544                                 goto out;
545                         }
546                         cfg.peer_cookie_len = len;
547                         memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
548                 }
549                 if (info->attrs[L2TP_ATTR_IFNAME])
550                         cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
551
552                 if (info->attrs[L2TP_ATTR_VLAN_ID])
553                         cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
554         }
555
556         if (info->attrs[L2TP_ATTR_DEBUG])
557                 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
558
559         if (info->attrs[L2TP_ATTR_RECV_SEQ])
560                 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
561
562         if (info->attrs[L2TP_ATTR_SEND_SEQ])
563                 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
564
565         if (info->attrs[L2TP_ATTR_LNS_MODE])
566                 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
567
568         if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
569                 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
570
571         if (info->attrs[L2TP_ATTR_MTU])
572                 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
573
574         if (info->attrs[L2TP_ATTR_MRU])
575                 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
576
577         if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
578             (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
579                 ret = -EPROTONOSUPPORT;
580                 goto out;
581         }
582
583         /* Check that pseudowire-specific params are present */
584         switch (cfg.pw_type) {
585         case L2TP_PWTYPE_NONE:
586                 break;
587         case L2TP_PWTYPE_ETH_VLAN:
588                 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
589                         ret = -EINVAL;
590                         goto out;
591                 }
592                 break;
593         case L2TP_PWTYPE_ETH:
594                 break;
595         case L2TP_PWTYPE_PPP:
596         case L2TP_PWTYPE_PPP_AC:
597                 break;
598         case L2TP_PWTYPE_IP:
599         default:
600                 ret = -EPROTONOSUPPORT;
601                 break;
602         }
603
604         ret = -EPROTONOSUPPORT;
605         if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
606                 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
607                         session_id, peer_session_id, &cfg);
608
609         if (ret >= 0) {
610                 session = l2tp_session_find(net, tunnel, session_id);
611                 if (session)
612                         ret = l2tp_session_notify(&l2tp_nl_family, info, session,
613                                                   L2TP_CMD_SESSION_CREATE);
614         }
615
616 out:
617         return ret;
618 }
619
620 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
621 {
622         int ret = 0;
623         struct l2tp_session *session;
624         u16 pw_type;
625
626         session = l2tp_nl_session_find(info);
627         if (session == NULL) {
628                 ret = -ENODEV;
629                 goto out;
630         }
631
632         l2tp_session_notify(&l2tp_nl_family, info,
633                             session, L2TP_CMD_SESSION_DELETE);
634
635         pw_type = session->pwtype;
636         if (pw_type < __L2TP_PWTYPE_MAX)
637                 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
638                         ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
639
640 out:
641         return ret;
642 }
643
644 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
645 {
646         int ret = 0;
647         struct l2tp_session *session;
648
649         session = l2tp_nl_session_find(info);
650         if (session == NULL) {
651                 ret = -ENODEV;
652                 goto out;
653         }
654
655         if (info->attrs[L2TP_ATTR_DEBUG])
656                 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
657
658         if (info->attrs[L2TP_ATTR_DATA_SEQ])
659                 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
660
661         if (info->attrs[L2TP_ATTR_RECV_SEQ])
662                 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
663
664         if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
665                 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
666                 l2tp_session_set_header_len(session, session->tunnel->version);
667         }
668
669         if (info->attrs[L2TP_ATTR_LNS_MODE])
670                 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
671
672         if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
673                 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
674
675         if (info->attrs[L2TP_ATTR_MTU])
676                 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
677
678         if (info->attrs[L2TP_ATTR_MRU])
679                 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
680
681         ret = l2tp_session_notify(&l2tp_nl_family, info,
682                                   session, L2TP_CMD_SESSION_MODIFY);
683
684 out:
685         return ret;
686 }
687
688 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
689                                 struct l2tp_session *session, u8 cmd)
690 {
691         void *hdr;
692         struct nlattr *nest;
693         struct l2tp_tunnel *tunnel = session->tunnel;
694         struct sock *sk = NULL;
695
696         sk = tunnel->sock;
697
698         hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
699         if (!hdr)
700                 return -EMSGSIZE;
701
702         if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
703             nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
704             nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
705             nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
706                         session->peer_session_id) ||
707             nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
708             nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
709             nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
710             (session->mru &&
711              nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
712                 goto nla_put_failure;
713
714         if ((session->ifname[0] &&
715              nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
716             (session->cookie_len &&
717              nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
718                      &session->cookie[0])) ||
719             (session->peer_cookie_len &&
720              nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
721                      &session->peer_cookie[0])) ||
722             nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
723             nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
724             nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
725 #ifdef CONFIG_XFRM
726             (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
727              nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
728 #endif
729             (session->reorder_timeout &&
730              nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
731                 goto nla_put_failure;
732
733         nest = nla_nest_start(skb, L2TP_ATTR_STATS);
734         if (nest == NULL)
735                 goto nla_put_failure;
736
737         if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
738                 atomic_long_read(&session->stats.tx_packets)) ||
739             nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
740                 atomic_long_read(&session->stats.tx_bytes)) ||
741             nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
742                 atomic_long_read(&session->stats.tx_errors)) ||
743             nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
744                 atomic_long_read(&session->stats.rx_packets)) ||
745             nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
746                 atomic_long_read(&session->stats.rx_bytes)) ||
747             nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
748                 atomic_long_read(&session->stats.rx_seq_discards)) ||
749             nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
750                 atomic_long_read(&session->stats.rx_oos_packets)) ||
751             nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
752                 atomic_long_read(&session->stats.rx_errors)))
753                 goto nla_put_failure;
754         nla_nest_end(skb, nest);
755
756         genlmsg_end(skb, hdr);
757         return 0;
758
759  nla_put_failure:
760         genlmsg_cancel(skb, hdr);
761         return -1;
762 }
763
764 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
765 {
766         struct l2tp_session *session;
767         struct sk_buff *msg;
768         int ret;
769
770         session = l2tp_nl_session_find(info);
771         if (session == NULL) {
772                 ret = -ENODEV;
773                 goto out;
774         }
775
776         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
777         if (!msg) {
778                 ret = -ENOMEM;
779                 goto out;
780         }
781
782         ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
783                                    0, session, L2TP_CMD_SESSION_GET);
784         if (ret < 0)
785                 goto err_out;
786
787         return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
788
789 err_out:
790         nlmsg_free(msg);
791
792 out:
793         return ret;
794 }
795
796 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
797 {
798         struct net *net = sock_net(skb->sk);
799         struct l2tp_session *session;
800         struct l2tp_tunnel *tunnel = NULL;
801         int ti = cb->args[0];
802         int si = cb->args[1];
803
804         for (;;) {
805                 if (tunnel == NULL) {
806                         tunnel = l2tp_tunnel_find_nth(net, ti);
807                         if (tunnel == NULL)
808                                 goto out;
809                 }
810
811                 session = l2tp_session_find_nth(tunnel, si);
812                 if (session == NULL) {
813                         ti++;
814                         tunnel = NULL;
815                         si = 0;
816                         continue;
817                 }
818
819                 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
820                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
821                                          session, L2TP_CMD_SESSION_GET) < 0)
822                         break;
823
824                 si++;
825         }
826
827 out:
828         cb->args[0] = ti;
829         cb->args[1] = si;
830
831         return skb->len;
832 }
833
834 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
835         [L2TP_ATTR_NONE]                = { .type = NLA_UNSPEC, },
836         [L2TP_ATTR_PW_TYPE]             = { .type = NLA_U16, },
837         [L2TP_ATTR_ENCAP_TYPE]          = { .type = NLA_U16, },
838         [L2TP_ATTR_OFFSET]              = { .type = NLA_U16, },
839         [L2TP_ATTR_DATA_SEQ]            = { .type = NLA_U8, },
840         [L2TP_ATTR_L2SPEC_TYPE]         = { .type = NLA_U8, },
841         [L2TP_ATTR_L2SPEC_LEN]          = { .type = NLA_U8, },
842         [L2TP_ATTR_PROTO_VERSION]       = { .type = NLA_U8, },
843         [L2TP_ATTR_CONN_ID]             = { .type = NLA_U32, },
844         [L2TP_ATTR_PEER_CONN_ID]        = { .type = NLA_U32, },
845         [L2TP_ATTR_SESSION_ID]          = { .type = NLA_U32, },
846         [L2TP_ATTR_PEER_SESSION_ID]     = { .type = NLA_U32, },
847         [L2TP_ATTR_UDP_CSUM]            = { .type = NLA_U8, },
848         [L2TP_ATTR_VLAN_ID]             = { .type = NLA_U16, },
849         [L2TP_ATTR_DEBUG]               = { .type = NLA_U32, },
850         [L2TP_ATTR_RECV_SEQ]            = { .type = NLA_U8, },
851         [L2TP_ATTR_SEND_SEQ]            = { .type = NLA_U8, },
852         [L2TP_ATTR_LNS_MODE]            = { .type = NLA_U8, },
853         [L2TP_ATTR_USING_IPSEC]         = { .type = NLA_U8, },
854         [L2TP_ATTR_RECV_TIMEOUT]        = { .type = NLA_MSECS, },
855         [L2TP_ATTR_FD]                  = { .type = NLA_U32, },
856         [L2TP_ATTR_IP_SADDR]            = { .type = NLA_U32, },
857         [L2TP_ATTR_IP_DADDR]            = { .type = NLA_U32, },
858         [L2TP_ATTR_UDP_SPORT]           = { .type = NLA_U16, },
859         [L2TP_ATTR_UDP_DPORT]           = { .type = NLA_U16, },
860         [L2TP_ATTR_MTU]                 = { .type = NLA_U16, },
861         [L2TP_ATTR_MRU]                 = { .type = NLA_U16, },
862         [L2TP_ATTR_STATS]               = { .type = NLA_NESTED, },
863         [L2TP_ATTR_IP6_SADDR] = {
864                 .type = NLA_BINARY,
865                 .len = sizeof(struct in6_addr),
866         },
867         [L2TP_ATTR_IP6_DADDR] = {
868                 .type = NLA_BINARY,
869                 .len = sizeof(struct in6_addr),
870         },
871         [L2TP_ATTR_IFNAME] = {
872                 .type = NLA_NUL_STRING,
873                 .len = IFNAMSIZ - 1,
874         },
875         [L2TP_ATTR_COOKIE] = {
876                 .type = NLA_BINARY,
877                 .len = 8,
878         },
879         [L2TP_ATTR_PEER_COOKIE] = {
880                 .type = NLA_BINARY,
881                 .len = 8,
882         },
883 };
884
885 static const struct genl_ops l2tp_nl_ops[] = {
886         {
887                 .cmd = L2TP_CMD_NOOP,
888                 .doit = l2tp_nl_cmd_noop,
889                 .policy = l2tp_nl_policy,
890                 /* can be retrieved by unprivileged users */
891         },
892         {
893                 .cmd = L2TP_CMD_TUNNEL_CREATE,
894                 .doit = l2tp_nl_cmd_tunnel_create,
895                 .policy = l2tp_nl_policy,
896                 .flags = GENL_ADMIN_PERM,
897         },
898         {
899                 .cmd = L2TP_CMD_TUNNEL_DELETE,
900                 .doit = l2tp_nl_cmd_tunnel_delete,
901                 .policy = l2tp_nl_policy,
902                 .flags = GENL_ADMIN_PERM,
903         },
904         {
905                 .cmd = L2TP_CMD_TUNNEL_MODIFY,
906                 .doit = l2tp_nl_cmd_tunnel_modify,
907                 .policy = l2tp_nl_policy,
908                 .flags = GENL_ADMIN_PERM,
909         },
910         {
911                 .cmd = L2TP_CMD_TUNNEL_GET,
912                 .doit = l2tp_nl_cmd_tunnel_get,
913                 .dumpit = l2tp_nl_cmd_tunnel_dump,
914                 .policy = l2tp_nl_policy,
915                 .flags = GENL_ADMIN_PERM,
916         },
917         {
918                 .cmd = L2TP_CMD_SESSION_CREATE,
919                 .doit = l2tp_nl_cmd_session_create,
920                 .policy = l2tp_nl_policy,
921                 .flags = GENL_ADMIN_PERM,
922         },
923         {
924                 .cmd = L2TP_CMD_SESSION_DELETE,
925                 .doit = l2tp_nl_cmd_session_delete,
926                 .policy = l2tp_nl_policy,
927                 .flags = GENL_ADMIN_PERM,
928         },
929         {
930                 .cmd = L2TP_CMD_SESSION_MODIFY,
931                 .doit = l2tp_nl_cmd_session_modify,
932                 .policy = l2tp_nl_policy,
933                 .flags = GENL_ADMIN_PERM,
934         },
935         {
936                 .cmd = L2TP_CMD_SESSION_GET,
937                 .doit = l2tp_nl_cmd_session_get,
938                 .dumpit = l2tp_nl_cmd_session_dump,
939                 .policy = l2tp_nl_policy,
940                 .flags = GENL_ADMIN_PERM,
941         },
942 };
943
944 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
945 {
946         int ret;
947
948         ret = -EINVAL;
949         if (pw_type >= __L2TP_PWTYPE_MAX)
950                 goto err;
951
952         genl_lock();
953         ret = -EBUSY;
954         if (l2tp_nl_cmd_ops[pw_type])
955                 goto out;
956
957         l2tp_nl_cmd_ops[pw_type] = ops;
958         ret = 0;
959
960 out:
961         genl_unlock();
962 err:
963         return ret;
964 }
965 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
966
967 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
968 {
969         if (pw_type < __L2TP_PWTYPE_MAX) {
970                 genl_lock();
971                 l2tp_nl_cmd_ops[pw_type] = NULL;
972                 genl_unlock();
973         }
974 }
975 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
976
977 static int l2tp_nl_init(void)
978 {
979         pr_info("L2TP netlink interface\n");
980         return genl_register_family_with_ops_groups(&l2tp_nl_family,
981                                                     l2tp_nl_ops,
982                                                     l2tp_multicast_group);
983 }
984
985 static void l2tp_nl_cleanup(void)
986 {
987         genl_unregister_family(&l2tp_nl_family);
988 }
989
990 module_init(l2tp_nl_init);
991 module_exit(l2tp_nl_cleanup);
992
993 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
994 MODULE_DESCRIPTION("L2TP netlink");
995 MODULE_LICENSE("GPL");
996 MODULE_VERSION("1.0");
997 MODULE_ALIAS_GENL_FAMILY("l2tp");