Commit | Line | Data |
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309795f4 JC |
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 | ||
789a4a2c JC |
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]); | |
309795f4 | 146 | } |
309795f4 JC |
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-" \ | |
f481c0d8 | 840 | __stringify(NETLINK_GENERIC) "-type-" "l2tp"); |