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 | ||
a4ca44fa JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
309795f4 JC |
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, | |
b6fdfdfa | 40 | .netnsok = true, |
309795f4 JC |
41 | }; |
42 | ||
43 | /* Accessed under genl lock */ | |
44 | static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; | |
45 | ||
46 | static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info) | |
47 | { | |
48 | u32 tunnel_id; | |
49 | u32 session_id; | |
50 | char *ifname; | |
51 | struct l2tp_tunnel *tunnel; | |
52 | struct l2tp_session *session = NULL; | |
53 | struct net *net = genl_info_net(info); | |
54 | ||
55 | if (info->attrs[L2TP_ATTR_IFNAME]) { | |
56 | ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
57 | session = l2tp_session_find_by_ifname(net, ifname); | |
58 | } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && | |
59 | (info->attrs[L2TP_ATTR_CONN_ID])) { | |
60 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
61 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
62 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
63 | if (tunnel) | |
64 | session = l2tp_session_find(net, tunnel, session_id); | |
65 | } | |
66 | ||
67 | return session; | |
68 | } | |
69 | ||
70 | static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) | |
71 | { | |
72 | struct sk_buff *msg; | |
73 | void *hdr; | |
74 | int ret = -ENOBUFS; | |
75 | ||
58050fce | 76 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
77 | if (!msg) { |
78 | ret = -ENOMEM; | |
79 | goto out; | |
80 | } | |
81 | ||
15e47304 | 82 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, |
309795f4 | 83 | &l2tp_nl_family, 0, L2TP_CMD_NOOP); |
7f8436a1 WY |
84 | if (!hdr) { |
85 | ret = -EMSGSIZE; | |
309795f4 JC |
86 | goto err_out; |
87 | } | |
88 | ||
89 | genlmsg_end(msg, hdr); | |
90 | ||
15e47304 | 91 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); |
309795f4 JC |
92 | |
93 | err_out: | |
94 | nlmsg_free(msg); | |
95 | ||
96 | out: | |
97 | return ret; | |
98 | } | |
99 | ||
100 | static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info) | |
101 | { | |
102 | u32 tunnel_id; | |
103 | u32 peer_tunnel_id; | |
104 | int proto_version; | |
105 | int fd; | |
106 | int ret = 0; | |
107 | struct l2tp_tunnel_cfg cfg = { 0, }; | |
108 | struct l2tp_tunnel *tunnel; | |
109 | struct net *net = genl_info_net(info); | |
110 | ||
111 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
112 | ret = -EINVAL; | |
113 | goto out; | |
114 | } | |
115 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
116 | ||
117 | if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) { | |
118 | ret = -EINVAL; | |
119 | goto out; | |
120 | } | |
121 | peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]); | |
122 | ||
123 | if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) { | |
124 | ret = -EINVAL; | |
125 | goto out; | |
126 | } | |
127 | proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]); | |
128 | ||
129 | if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) { | |
130 | ret = -EINVAL; | |
131 | goto out; | |
132 | } | |
133 | cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]); | |
134 | ||
789a4a2c JC |
135 | fd = -1; |
136 | if (info->attrs[L2TP_ATTR_FD]) { | |
137 | fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); | |
138 | } else { | |
f9bac8df CE |
139 | #if IS_ENABLED(CONFIG_IPV6) |
140 | if (info->attrs[L2TP_ATTR_IP6_SADDR] && | |
141 | info->attrs[L2TP_ATTR_IP6_DADDR]) { | |
142 | cfg.local_ip6 = nla_data( | |
143 | info->attrs[L2TP_ATTR_IP6_SADDR]); | |
144 | cfg.peer_ip6 = nla_data( | |
145 | info->attrs[L2TP_ATTR_IP6_DADDR]); | |
146 | } else | |
147 | #endif | |
148 | if (info->attrs[L2TP_ATTR_IP_SADDR] && | |
149 | info->attrs[L2TP_ATTR_IP_DADDR]) { | |
150 | cfg.local_ip.s_addr = nla_get_be32( | |
151 | info->attrs[L2TP_ATTR_IP_SADDR]); | |
152 | cfg.peer_ip.s_addr = nla_get_be32( | |
153 | info->attrs[L2TP_ATTR_IP_DADDR]); | |
154 | } else { | |
155 | ret = -EINVAL; | |
156 | goto out; | |
157 | } | |
789a4a2c JC |
158 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) |
159 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); | |
160 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) | |
161 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); | |
162 | if (info->attrs[L2TP_ATTR_UDP_CSUM]) | |
163 | cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); | |
6b649fea TH |
164 | |
165 | #if IS_ENABLED(CONFIG_IPV6) | |
166 | if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]) | |
167 | cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]); | |
168 | if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]) | |
169 | cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]); | |
170 | #endif | |
309795f4 | 171 | } |
309795f4 JC |
172 | |
173 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
174 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
175 | ||
176 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
177 | if (tunnel != NULL) { | |
178 | ret = -EEXIST; | |
179 | goto out; | |
180 | } | |
181 | ||
182 | ret = -EINVAL; | |
183 | switch (cfg.encap) { | |
184 | case L2TP_ENCAPTYPE_UDP: | |
185 | case L2TP_ENCAPTYPE_IP: | |
186 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, | |
187 | peer_tunnel_id, &cfg, &tunnel); | |
188 | break; | |
189 | } | |
190 | ||
191 | out: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static int l2tp_nl_cmd_tunnel_delete(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 | (void) l2tp_tunnel_delete(tunnel); | |
215 | ||
216 | out: | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) | |
221 | { | |
222 | struct l2tp_tunnel *tunnel; | |
223 | u32 tunnel_id; | |
224 | int ret = 0; | |
225 | struct net *net = genl_info_net(info); | |
226 | ||
227 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
228 | ret = -EINVAL; | |
229 | goto out; | |
230 | } | |
231 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
232 | ||
233 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
234 | if (tunnel == NULL) { | |
235 | ret = -ENODEV; | |
236 | goto out; | |
237 | } | |
238 | ||
239 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
240 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
241 | ||
242 | out: | |
243 | return ret; | |
244 | } | |
245 | ||
15e47304 | 246 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
309795f4 JC |
247 | struct l2tp_tunnel *tunnel) |
248 | { | |
249 | void *hdr; | |
250 | struct nlattr *nest; | |
251 | struct sock *sk = NULL; | |
252 | struct inet_sock *inet; | |
f9bac8df CE |
253 | #if IS_ENABLED(CONFIG_IPV6) |
254 | struct ipv6_pinfo *np = NULL; | |
255 | #endif | |
309795f4 | 256 | |
15e47304 | 257 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, |
309795f4 | 258 | L2TP_CMD_TUNNEL_GET); |
7f8436a1 WY |
259 | if (!hdr) |
260 | return -EMSGSIZE; | |
309795f4 | 261 | |
60aed2ab DM |
262 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
263 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || | |
264 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
265 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || | |
266 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) | |
267 | goto nla_put_failure; | |
309795f4 JC |
268 | |
269 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); | |
270 | if (nest == NULL) | |
271 | goto nla_put_failure; | |
272 | ||
7b7c0719 TP |
273 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, |
274 | atomic_long_read(&tunnel->stats.tx_packets)) || | |
275 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, | |
276 | atomic_long_read(&tunnel->stats.tx_bytes)) || | |
277 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, | |
278 | atomic_long_read(&tunnel->stats.tx_errors)) || | |
279 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, | |
280 | atomic_long_read(&tunnel->stats.rx_packets)) || | |
281 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, | |
282 | atomic_long_read(&tunnel->stats.rx_bytes)) || | |
60aed2ab | 283 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
7b7c0719 | 284 | atomic_long_read(&tunnel->stats.rx_seq_discards)) || |
60aed2ab | 285 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
7b7c0719 TP |
286 | atomic_long_read(&tunnel->stats.rx_oos_packets)) || |
287 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, | |
288 | atomic_long_read(&tunnel->stats.rx_errors))) | |
60aed2ab | 289 | goto nla_put_failure; |
309795f4 JC |
290 | nla_nest_end(skb, nest); |
291 | ||
292 | sk = tunnel->sock; | |
293 | if (!sk) | |
294 | goto out; | |
295 | ||
f9bac8df CE |
296 | #if IS_ENABLED(CONFIG_IPV6) |
297 | if (sk->sk_family == AF_INET6) | |
298 | np = inet6_sk(sk); | |
299 | #endif | |
300 | ||
309795f4 JC |
301 | inet = inet_sk(sk); |
302 | ||
303 | switch (tunnel->encap) { | |
304 | case L2TP_ENCAPTYPE_UDP: | |
60aed2ab DM |
305 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
306 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || | |
28448b80 | 307 | nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx)) |
60aed2ab | 308 | goto nla_put_failure; |
309795f4 JC |
309 | /* NOBREAK */ |
310 | case L2TP_ENCAPTYPE_IP: | |
f9bac8df CE |
311 | #if IS_ENABLED(CONFIG_IPV6) |
312 | if (np) { | |
313 | if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr), | |
314 | &np->saddr) || | |
efe4208f ED |
315 | nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(sk->sk_v6_daddr), |
316 | &sk->sk_v6_daddr)) | |
f9bac8df CE |
317 | goto nla_put_failure; |
318 | } else | |
319 | #endif | |
60aed2ab DM |
320 | if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || |
321 | nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) | |
322 | goto nla_put_failure; | |
309795f4 JC |
323 | break; |
324 | } | |
325 | ||
326 | out: | |
327 | return genlmsg_end(skb, hdr); | |
328 | ||
329 | nla_put_failure: | |
330 | genlmsg_cancel(skb, hdr); | |
331 | return -1; | |
332 | } | |
333 | ||
334 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) | |
335 | { | |
336 | struct l2tp_tunnel *tunnel; | |
337 | struct sk_buff *msg; | |
338 | u32 tunnel_id; | |
339 | int ret = -ENOBUFS; | |
340 | struct net *net = genl_info_net(info); | |
341 | ||
342 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
343 | ret = -EINVAL; | |
344 | goto out; | |
345 | } | |
346 | ||
347 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
348 | ||
349 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
350 | if (tunnel == NULL) { | |
351 | ret = -ENODEV; | |
352 | goto out; | |
353 | } | |
354 | ||
58050fce | 355 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
356 | if (!msg) { |
357 | ret = -ENOMEM; | |
358 | goto out; | |
359 | } | |
360 | ||
15e47304 | 361 | ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, |
309795f4 JC |
362 | NLM_F_ACK, tunnel); |
363 | if (ret < 0) | |
364 | goto err_out; | |
365 | ||
15e47304 | 366 | return genlmsg_unicast(net, msg, info->snd_portid); |
309795f4 JC |
367 | |
368 | err_out: | |
369 | nlmsg_free(msg); | |
370 | ||
371 | out: | |
372 | return ret; | |
373 | } | |
374 | ||
375 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
376 | { | |
377 | int ti = cb->args[0]; | |
378 | struct l2tp_tunnel *tunnel; | |
379 | struct net *net = sock_net(skb->sk); | |
380 | ||
381 | for (;;) { | |
382 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
383 | if (tunnel == NULL) | |
384 | goto out; | |
385 | ||
15e47304 | 386 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid, |
309795f4 JC |
387 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
388 | tunnel) <= 0) | |
389 | goto out; | |
390 | ||
391 | ti++; | |
392 | } | |
393 | ||
394 | out: | |
395 | cb->args[0] = ti; | |
396 | ||
397 | return skb->len; | |
398 | } | |
399 | ||
400 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) | |
401 | { | |
402 | u32 tunnel_id = 0; | |
403 | u32 session_id; | |
404 | u32 peer_session_id; | |
405 | int ret = 0; | |
406 | struct l2tp_tunnel *tunnel; | |
407 | struct l2tp_session *session; | |
408 | struct l2tp_session_cfg cfg = { 0, }; | |
409 | struct net *net = genl_info_net(info); | |
410 | ||
411 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
412 | ret = -EINVAL; | |
413 | goto out; | |
414 | } | |
415 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
416 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
417 | if (!tunnel) { | |
418 | ret = -ENODEV; | |
419 | goto out; | |
420 | } | |
421 | ||
422 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { | |
423 | ret = -EINVAL; | |
424 | goto out; | |
425 | } | |
426 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
427 | session = l2tp_session_find(net, tunnel, session_id); | |
428 | if (session) { | |
429 | ret = -EEXIST; | |
430 | goto out; | |
431 | } | |
432 | ||
433 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { | |
434 | ret = -EINVAL; | |
435 | goto out; | |
436 | } | |
437 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); | |
438 | ||
439 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { | |
440 | ret = -EINVAL; | |
441 | goto out; | |
442 | } | |
443 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); | |
444 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { | |
445 | ret = -EINVAL; | |
446 | goto out; | |
447 | } | |
448 | ||
449 | if (tunnel->version > 2) { | |
450 | if (info->attrs[L2TP_ATTR_OFFSET]) | |
451 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); | |
452 | ||
453 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
454 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
455 | ||
456 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; | |
457 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) | |
458 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); | |
459 | ||
460 | cfg.l2specific_len = 4; | |
461 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) | |
462 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); | |
463 | ||
464 | if (info->attrs[L2TP_ATTR_COOKIE]) { | |
465 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); | |
466 | if (len > 8) { | |
467 | ret = -EINVAL; | |
468 | goto out; | |
469 | } | |
470 | cfg.cookie_len = len; | |
471 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); | |
472 | } | |
473 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { | |
474 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); | |
475 | if (len > 8) { | |
476 | ret = -EINVAL; | |
477 | goto out; | |
478 | } | |
479 | cfg.peer_cookie_len = len; | |
480 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); | |
481 | } | |
482 | if (info->attrs[L2TP_ATTR_IFNAME]) | |
483 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
484 | ||
485 | if (info->attrs[L2TP_ATTR_VLAN_ID]) | |
486 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); | |
487 | } | |
488 | ||
489 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
490 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
491 | ||
492 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
493 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
494 | ||
495 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
496 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
497 | ||
498 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
499 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
500 | ||
501 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
502 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
503 | ||
504 | if (info->attrs[L2TP_ATTR_MTU]) | |
505 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
506 | ||
507 | if (info->attrs[L2TP_ATTR_MRU]) | |
508 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
509 | ||
510 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || | |
511 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { | |
512 | ret = -EPROTONOSUPPORT; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | /* Check that pseudowire-specific params are present */ | |
517 | switch (cfg.pw_type) { | |
518 | case L2TP_PWTYPE_NONE: | |
519 | break; | |
520 | case L2TP_PWTYPE_ETH_VLAN: | |
521 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { | |
522 | ret = -EINVAL; | |
523 | goto out; | |
524 | } | |
525 | break; | |
526 | case L2TP_PWTYPE_ETH: | |
527 | break; | |
528 | case L2TP_PWTYPE_PPP: | |
529 | case L2TP_PWTYPE_PPP_AC: | |
530 | break; | |
531 | case L2TP_PWTYPE_IP: | |
532 | default: | |
533 | ret = -EPROTONOSUPPORT; | |
534 | break; | |
535 | } | |
536 | ||
537 | ret = -EPROTONOSUPPORT; | |
538 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) | |
539 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, | |
540 | session_id, peer_session_id, &cfg); | |
541 | ||
542 | out: | |
543 | return ret; | |
544 | } | |
545 | ||
546 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) | |
547 | { | |
548 | int ret = 0; | |
549 | struct l2tp_session *session; | |
550 | u16 pw_type; | |
551 | ||
552 | session = l2tp_nl_session_find(info); | |
553 | if (session == NULL) { | |
554 | ret = -ENODEV; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | pw_type = session->pwtype; | |
559 | if (pw_type < __L2TP_PWTYPE_MAX) | |
560 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) | |
561 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); | |
562 | ||
563 | out: | |
564 | return ret; | |
565 | } | |
566 | ||
567 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) | |
568 | { | |
569 | int ret = 0; | |
570 | struct l2tp_session *session; | |
571 | ||
572 | session = l2tp_nl_session_find(info); | |
573 | if (session == NULL) { | |
574 | ret = -ENODEV; | |
575 | goto out; | |
576 | } | |
577 | ||
578 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
579 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
580 | ||
581 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
582 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
583 | ||
584 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
585 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
586 | ||
bb5016ea | 587 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) { |
309795f4 | 588 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); |
bb5016ea GN |
589 | l2tp_session_set_header_len(session, session->tunnel->version); |
590 | } | |
309795f4 JC |
591 | |
592 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
593 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
594 | ||
595 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
596 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
597 | ||
598 | if (info->attrs[L2TP_ATTR_MTU]) | |
599 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
600 | ||
601 | if (info->attrs[L2TP_ATTR_MRU]) | |
602 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
603 | ||
604 | out: | |
605 | return ret; | |
606 | } | |
607 | ||
15e47304 | 608 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
309795f4 JC |
609 | struct l2tp_session *session) |
610 | { | |
611 | void *hdr; | |
612 | struct nlattr *nest; | |
613 | struct l2tp_tunnel *tunnel = session->tunnel; | |
614 | struct sock *sk = NULL; | |
615 | ||
616 | sk = tunnel->sock; | |
617 | ||
15e47304 | 618 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); |
7f8436a1 WY |
619 | if (!hdr) |
620 | return -EMSGSIZE; | |
309795f4 | 621 | |
60aed2ab DM |
622 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
623 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || | |
624 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
625 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, | |
626 | session->peer_session_id) || | |
627 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || | |
628 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || | |
629 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || | |
630 | (session->mru && | |
631 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) | |
632 | goto nla_put_failure; | |
633 | ||
e269ed26 | 634 | if ((session->ifname[0] && |
60aed2ab DM |
635 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || |
636 | (session->cookie_len && | |
637 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, | |
638 | &session->cookie[0])) || | |
639 | (session->peer_cookie_len && | |
640 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, | |
641 | &session->peer_cookie[0])) || | |
642 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || | |
643 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || | |
644 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || | |
309795f4 | 645 | #ifdef CONFIG_XFRM |
60aed2ab DM |
646 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
647 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || | |
309795f4 | 648 | #endif |
60aed2ab DM |
649 | (session->reorder_timeout && |
650 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout))) | |
651 | goto nla_put_failure; | |
5de7aee5 | 652 | |
309795f4 JC |
653 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
654 | if (nest == NULL) | |
655 | goto nla_put_failure; | |
5de7aee5 | 656 | |
7b7c0719 TP |
657 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, |
658 | atomic_long_read(&session->stats.tx_packets)) || | |
659 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, | |
660 | atomic_long_read(&session->stats.tx_bytes)) || | |
661 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, | |
662 | atomic_long_read(&session->stats.tx_errors)) || | |
663 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, | |
664 | atomic_long_read(&session->stats.rx_packets)) || | |
665 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, | |
666 | atomic_long_read(&session->stats.rx_bytes)) || | |
60aed2ab | 667 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
7b7c0719 | 668 | atomic_long_read(&session->stats.rx_seq_discards)) || |
60aed2ab | 669 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
7b7c0719 TP |
670 | atomic_long_read(&session->stats.rx_oos_packets)) || |
671 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, | |
672 | atomic_long_read(&session->stats.rx_errors))) | |
60aed2ab | 673 | goto nla_put_failure; |
309795f4 JC |
674 | nla_nest_end(skb, nest); |
675 | ||
676 | return genlmsg_end(skb, hdr); | |
677 | ||
678 | nla_put_failure: | |
679 | genlmsg_cancel(skb, hdr); | |
680 | return -1; | |
681 | } | |
682 | ||
683 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) | |
684 | { | |
685 | struct l2tp_session *session; | |
686 | struct sk_buff *msg; | |
687 | int ret; | |
688 | ||
689 | session = l2tp_nl_session_find(info); | |
690 | if (session == NULL) { | |
691 | ret = -ENODEV; | |
692 | goto out; | |
693 | } | |
694 | ||
58050fce | 695 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
696 | if (!msg) { |
697 | ret = -ENOMEM; | |
698 | goto out; | |
699 | } | |
700 | ||
15e47304 | 701 | ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq, |
309795f4 JC |
702 | 0, session); |
703 | if (ret < 0) | |
704 | goto err_out; | |
705 | ||
15e47304 | 706 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); |
309795f4 JC |
707 | |
708 | err_out: | |
709 | nlmsg_free(msg); | |
710 | ||
711 | out: | |
712 | return ret; | |
713 | } | |
714 | ||
715 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
716 | { | |
717 | struct net *net = sock_net(skb->sk); | |
718 | struct l2tp_session *session; | |
719 | struct l2tp_tunnel *tunnel = NULL; | |
720 | int ti = cb->args[0]; | |
721 | int si = cb->args[1]; | |
722 | ||
723 | for (;;) { | |
724 | if (tunnel == NULL) { | |
725 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
726 | if (tunnel == NULL) | |
727 | goto out; | |
728 | } | |
729 | ||
730 | session = l2tp_session_find_nth(tunnel, si); | |
731 | if (session == NULL) { | |
732 | ti++; | |
733 | tunnel = NULL; | |
734 | si = 0; | |
735 | continue; | |
736 | } | |
737 | ||
15e47304 | 738 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid, |
309795f4 JC |
739 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
740 | session) <= 0) | |
741 | break; | |
742 | ||
743 | si++; | |
744 | } | |
745 | ||
746 | out: | |
747 | cb->args[0] = ti; | |
748 | cb->args[1] = si; | |
749 | ||
750 | return skb->len; | |
751 | } | |
752 | ||
753 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { | |
754 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, | |
755 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, | |
756 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, | |
757 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, | |
758 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, | |
759 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, | |
760 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, | |
761 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, | |
762 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, | |
763 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, | |
764 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, | |
765 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, | |
766 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, | |
767 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, | |
768 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, | |
769 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, | |
770 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, | |
771 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, | |
772 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, | |
773 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, | |
774 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, | |
775 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, | |
776 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, | |
777 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, | |
778 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, | |
779 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, | |
780 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, | |
781 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, | |
f9bac8df CE |
782 | [L2TP_ATTR_IP6_SADDR] = { |
783 | .type = NLA_BINARY, | |
784 | .len = sizeof(struct in6_addr), | |
785 | }, | |
786 | [L2TP_ATTR_IP6_DADDR] = { | |
787 | .type = NLA_BINARY, | |
788 | .len = sizeof(struct in6_addr), | |
789 | }, | |
309795f4 JC |
790 | [L2TP_ATTR_IFNAME] = { |
791 | .type = NLA_NUL_STRING, | |
792 | .len = IFNAMSIZ - 1, | |
793 | }, | |
794 | [L2TP_ATTR_COOKIE] = { | |
795 | .type = NLA_BINARY, | |
796 | .len = 8, | |
797 | }, | |
798 | [L2TP_ATTR_PEER_COOKIE] = { | |
799 | .type = NLA_BINARY, | |
800 | .len = 8, | |
801 | }, | |
802 | }; | |
803 | ||
4534de83 | 804 | static const struct genl_ops l2tp_nl_ops[] = { |
309795f4 JC |
805 | { |
806 | .cmd = L2TP_CMD_NOOP, | |
807 | .doit = l2tp_nl_cmd_noop, | |
808 | .policy = l2tp_nl_policy, | |
809 | /* can be retrieved by unprivileged users */ | |
810 | }, | |
811 | { | |
812 | .cmd = L2TP_CMD_TUNNEL_CREATE, | |
813 | .doit = l2tp_nl_cmd_tunnel_create, | |
814 | .policy = l2tp_nl_policy, | |
815 | .flags = GENL_ADMIN_PERM, | |
816 | }, | |
817 | { | |
818 | .cmd = L2TP_CMD_TUNNEL_DELETE, | |
819 | .doit = l2tp_nl_cmd_tunnel_delete, | |
820 | .policy = l2tp_nl_policy, | |
821 | .flags = GENL_ADMIN_PERM, | |
822 | }, | |
823 | { | |
824 | .cmd = L2TP_CMD_TUNNEL_MODIFY, | |
825 | .doit = l2tp_nl_cmd_tunnel_modify, | |
826 | .policy = l2tp_nl_policy, | |
827 | .flags = GENL_ADMIN_PERM, | |
828 | }, | |
829 | { | |
830 | .cmd = L2TP_CMD_TUNNEL_GET, | |
831 | .doit = l2tp_nl_cmd_tunnel_get, | |
832 | .dumpit = l2tp_nl_cmd_tunnel_dump, | |
833 | .policy = l2tp_nl_policy, | |
834 | .flags = GENL_ADMIN_PERM, | |
835 | }, | |
836 | { | |
837 | .cmd = L2TP_CMD_SESSION_CREATE, | |
838 | .doit = l2tp_nl_cmd_session_create, | |
839 | .policy = l2tp_nl_policy, | |
840 | .flags = GENL_ADMIN_PERM, | |
841 | }, | |
842 | { | |
843 | .cmd = L2TP_CMD_SESSION_DELETE, | |
844 | .doit = l2tp_nl_cmd_session_delete, | |
845 | .policy = l2tp_nl_policy, | |
846 | .flags = GENL_ADMIN_PERM, | |
847 | }, | |
848 | { | |
849 | .cmd = L2TP_CMD_SESSION_MODIFY, | |
850 | .doit = l2tp_nl_cmd_session_modify, | |
851 | .policy = l2tp_nl_policy, | |
852 | .flags = GENL_ADMIN_PERM, | |
853 | }, | |
854 | { | |
855 | .cmd = L2TP_CMD_SESSION_GET, | |
856 | .doit = l2tp_nl_cmd_session_get, | |
857 | .dumpit = l2tp_nl_cmd_session_dump, | |
858 | .policy = l2tp_nl_policy, | |
859 | .flags = GENL_ADMIN_PERM, | |
860 | }, | |
861 | }; | |
862 | ||
863 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) | |
864 | { | |
865 | int ret; | |
866 | ||
867 | ret = -EINVAL; | |
868 | if (pw_type >= __L2TP_PWTYPE_MAX) | |
869 | goto err; | |
870 | ||
871 | genl_lock(); | |
872 | ret = -EBUSY; | |
873 | if (l2tp_nl_cmd_ops[pw_type]) | |
874 | goto out; | |
875 | ||
876 | l2tp_nl_cmd_ops[pw_type] = ops; | |
8cb49014 | 877 | ret = 0; |
309795f4 JC |
878 | |
879 | out: | |
880 | genl_unlock(); | |
881 | err: | |
8cb49014 | 882 | return ret; |
309795f4 JC |
883 | } |
884 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); | |
885 | ||
886 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) | |
887 | { | |
888 | if (pw_type < __L2TP_PWTYPE_MAX) { | |
889 | genl_lock(); | |
890 | l2tp_nl_cmd_ops[pw_type] = NULL; | |
891 | genl_unlock(); | |
892 | } | |
893 | } | |
894 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); | |
895 | ||
896 | static int l2tp_nl_init(void) | |
897 | { | |
a4ca44fa | 898 | pr_info("L2TP netlink interface\n"); |
c53ed742 | 899 | return genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops); |
309795f4 JC |
900 | } |
901 | ||
902 | static void l2tp_nl_cleanup(void) | |
903 | { | |
904 | genl_unregister_family(&l2tp_nl_family); | |
905 | } | |
906 | ||
907 | module_init(l2tp_nl_init); | |
908 | module_exit(l2tp_nl_cleanup); | |
909 | ||
910 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
911 | MODULE_DESCRIPTION("L2TP netlink"); | |
912 | MODULE_LICENSE("GPL"); | |
913 | MODULE_VERSION("1.0"); | |
e9412c37 | 914 | MODULE_ALIAS_GENL_FAMILY("l2tp"); |