Commit | Line | Data |
---|---|---|
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]); | |
309795f4 | 164 | } |
309795f4 JC |
165 | |
166 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
167 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
168 | ||
169 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
170 | if (tunnel != NULL) { | |
171 | ret = -EEXIST; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | ret = -EINVAL; | |
176 | switch (cfg.encap) { | |
177 | case L2TP_ENCAPTYPE_UDP: | |
178 | case L2TP_ENCAPTYPE_IP: | |
179 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, | |
180 | peer_tunnel_id, &cfg, &tunnel); | |
181 | break; | |
182 | } | |
183 | ||
184 | out: | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) | |
189 | { | |
190 | struct l2tp_tunnel *tunnel; | |
191 | u32 tunnel_id; | |
192 | int ret = 0; | |
193 | struct net *net = genl_info_net(info); | |
194 | ||
195 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
196 | ret = -EINVAL; | |
197 | goto out; | |
198 | } | |
199 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
200 | ||
201 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
202 | if (tunnel == NULL) { | |
203 | ret = -ENODEV; | |
204 | goto out; | |
205 | } | |
206 | ||
207 | (void) l2tp_tunnel_delete(tunnel); | |
208 | ||
209 | out: | |
210 | return ret; | |
211 | } | |
212 | ||
213 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) | |
214 | { | |
215 | struct l2tp_tunnel *tunnel; | |
216 | u32 tunnel_id; | |
217 | int ret = 0; | |
218 | struct net *net = genl_info_net(info); | |
219 | ||
220 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
221 | ret = -EINVAL; | |
222 | goto out; | |
223 | } | |
224 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
225 | ||
226 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
227 | if (tunnel == NULL) { | |
228 | ret = -ENODEV; | |
229 | goto out; | |
230 | } | |
231 | ||
232 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
233 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
234 | ||
235 | out: | |
236 | return ret; | |
237 | } | |
238 | ||
15e47304 | 239 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
309795f4 JC |
240 | struct l2tp_tunnel *tunnel) |
241 | { | |
242 | void *hdr; | |
243 | struct nlattr *nest; | |
244 | struct sock *sk = NULL; | |
245 | struct inet_sock *inet; | |
f9bac8df CE |
246 | #if IS_ENABLED(CONFIG_IPV6) |
247 | struct ipv6_pinfo *np = NULL; | |
248 | #endif | |
5de7aee5 JC |
249 | struct l2tp_stats stats; |
250 | unsigned int start; | |
309795f4 | 251 | |
15e47304 | 252 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, |
309795f4 | 253 | L2TP_CMD_TUNNEL_GET); |
7f8436a1 WY |
254 | if (!hdr) |
255 | return -EMSGSIZE; | |
309795f4 | 256 | |
60aed2ab DM |
257 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
258 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || | |
259 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
260 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || | |
261 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) | |
262 | goto nla_put_failure; | |
309795f4 JC |
263 | |
264 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); | |
265 | if (nest == NULL) | |
266 | goto nla_put_failure; | |
267 | ||
5de7aee5 JC |
268 | do { |
269 | start = u64_stats_fetch_begin(&tunnel->stats.syncp); | |
270 | stats.tx_packets = tunnel->stats.tx_packets; | |
271 | stats.tx_bytes = tunnel->stats.tx_bytes; | |
272 | stats.tx_errors = tunnel->stats.tx_errors; | |
273 | stats.rx_packets = tunnel->stats.rx_packets; | |
274 | stats.rx_bytes = tunnel->stats.rx_bytes; | |
275 | stats.rx_errors = tunnel->stats.rx_errors; | |
276 | stats.rx_seq_discards = tunnel->stats.rx_seq_discards; | |
277 | stats.rx_oos_packets = tunnel->stats.rx_oos_packets; | |
278 | } while (u64_stats_fetch_retry(&tunnel->stats.syncp, start)); | |
279 | ||
280 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
281 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
282 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
283 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
284 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 285 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 286 | stats.rx_seq_discards) || |
60aed2ab | 287 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
288 | stats.rx_oos_packets) || |
289 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 290 | goto nla_put_failure; |
309795f4 JC |
291 | nla_nest_end(skb, nest); |
292 | ||
293 | sk = tunnel->sock; | |
294 | if (!sk) | |
295 | goto out; | |
296 | ||
f9bac8df CE |
297 | #if IS_ENABLED(CONFIG_IPV6) |
298 | if (sk->sk_family == AF_INET6) | |
299 | np = inet6_sk(sk); | |
300 | #endif | |
301 | ||
309795f4 JC |
302 | inet = inet_sk(sk); |
303 | ||
304 | switch (tunnel->encap) { | |
305 | case L2TP_ENCAPTYPE_UDP: | |
60aed2ab DM |
306 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
307 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || | |
308 | nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, | |
309 | (sk->sk_no_check != UDP_CSUM_NOXMIT))) | |
310 | goto nla_put_failure; | |
309795f4 JC |
311 | /* NOBREAK */ |
312 | case L2TP_ENCAPTYPE_IP: | |
f9bac8df CE |
313 | #if IS_ENABLED(CONFIG_IPV6) |
314 | if (np) { | |
315 | if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr), | |
316 | &np->saddr) || | |
317 | nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr), | |
318 | &np->daddr)) | |
319 | goto nla_put_failure; | |
320 | } else | |
321 | #endif | |
60aed2ab DM |
322 | if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || |
323 | nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) | |
324 | goto nla_put_failure; | |
309795f4 JC |
325 | break; |
326 | } | |
327 | ||
328 | out: | |
329 | return genlmsg_end(skb, hdr); | |
330 | ||
331 | nla_put_failure: | |
332 | genlmsg_cancel(skb, hdr); | |
333 | return -1; | |
334 | } | |
335 | ||
336 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) | |
337 | { | |
338 | struct l2tp_tunnel *tunnel; | |
339 | struct sk_buff *msg; | |
340 | u32 tunnel_id; | |
341 | int ret = -ENOBUFS; | |
342 | struct net *net = genl_info_net(info); | |
343 | ||
344 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
345 | ret = -EINVAL; | |
346 | goto out; | |
347 | } | |
348 | ||
349 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
350 | ||
351 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
352 | if (tunnel == NULL) { | |
353 | ret = -ENODEV; | |
354 | goto out; | |
355 | } | |
356 | ||
58050fce | 357 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
358 | if (!msg) { |
359 | ret = -ENOMEM; | |
360 | goto out; | |
361 | } | |
362 | ||
15e47304 | 363 | ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, |
309795f4 JC |
364 | NLM_F_ACK, tunnel); |
365 | if (ret < 0) | |
366 | goto err_out; | |
367 | ||
15e47304 | 368 | return genlmsg_unicast(net, msg, info->snd_portid); |
309795f4 JC |
369 | |
370 | err_out: | |
371 | nlmsg_free(msg); | |
372 | ||
373 | out: | |
374 | return ret; | |
375 | } | |
376 | ||
377 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
378 | { | |
379 | int ti = cb->args[0]; | |
380 | struct l2tp_tunnel *tunnel; | |
381 | struct net *net = sock_net(skb->sk); | |
382 | ||
383 | for (;;) { | |
384 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
385 | if (tunnel == NULL) | |
386 | goto out; | |
387 | ||
15e47304 | 388 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid, |
309795f4 JC |
389 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
390 | tunnel) <= 0) | |
391 | goto out; | |
392 | ||
393 | ti++; | |
394 | } | |
395 | ||
396 | out: | |
397 | cb->args[0] = ti; | |
398 | ||
399 | return skb->len; | |
400 | } | |
401 | ||
402 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) | |
403 | { | |
404 | u32 tunnel_id = 0; | |
405 | u32 session_id; | |
406 | u32 peer_session_id; | |
407 | int ret = 0; | |
408 | struct l2tp_tunnel *tunnel; | |
409 | struct l2tp_session *session; | |
410 | struct l2tp_session_cfg cfg = { 0, }; | |
411 | struct net *net = genl_info_net(info); | |
412 | ||
413 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
414 | ret = -EINVAL; | |
415 | goto out; | |
416 | } | |
417 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
418 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
419 | if (!tunnel) { | |
420 | ret = -ENODEV; | |
421 | goto out; | |
422 | } | |
423 | ||
424 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { | |
425 | ret = -EINVAL; | |
426 | goto out; | |
427 | } | |
428 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
429 | session = l2tp_session_find(net, tunnel, session_id); | |
430 | if (session) { | |
431 | ret = -EEXIST; | |
432 | goto out; | |
433 | } | |
434 | ||
435 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { | |
436 | ret = -EINVAL; | |
437 | goto out; | |
438 | } | |
439 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); | |
440 | ||
441 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { | |
442 | ret = -EINVAL; | |
443 | goto out; | |
444 | } | |
445 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); | |
446 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { | |
447 | ret = -EINVAL; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | if (tunnel->version > 2) { | |
452 | if (info->attrs[L2TP_ATTR_OFFSET]) | |
453 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); | |
454 | ||
455 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
456 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
457 | ||
458 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; | |
459 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) | |
460 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); | |
461 | ||
462 | cfg.l2specific_len = 4; | |
463 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) | |
464 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); | |
465 | ||
466 | if (info->attrs[L2TP_ATTR_COOKIE]) { | |
467 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); | |
468 | if (len > 8) { | |
469 | ret = -EINVAL; | |
470 | goto out; | |
471 | } | |
472 | cfg.cookie_len = len; | |
473 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); | |
474 | } | |
475 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { | |
476 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); | |
477 | if (len > 8) { | |
478 | ret = -EINVAL; | |
479 | goto out; | |
480 | } | |
481 | cfg.peer_cookie_len = len; | |
482 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); | |
483 | } | |
484 | if (info->attrs[L2TP_ATTR_IFNAME]) | |
485 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
486 | ||
487 | if (info->attrs[L2TP_ATTR_VLAN_ID]) | |
488 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); | |
489 | } | |
490 | ||
491 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
492 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
493 | ||
494 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
495 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
496 | ||
497 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
498 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
499 | ||
500 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
501 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
502 | ||
503 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
504 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
505 | ||
506 | if (info->attrs[L2TP_ATTR_MTU]) | |
507 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
508 | ||
509 | if (info->attrs[L2TP_ATTR_MRU]) | |
510 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
511 | ||
512 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || | |
513 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { | |
514 | ret = -EPROTONOSUPPORT; | |
515 | goto out; | |
516 | } | |
517 | ||
518 | /* Check that pseudowire-specific params are present */ | |
519 | switch (cfg.pw_type) { | |
520 | case L2TP_PWTYPE_NONE: | |
521 | break; | |
522 | case L2TP_PWTYPE_ETH_VLAN: | |
523 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { | |
524 | ret = -EINVAL; | |
525 | goto out; | |
526 | } | |
527 | break; | |
528 | case L2TP_PWTYPE_ETH: | |
529 | break; | |
530 | case L2TP_PWTYPE_PPP: | |
531 | case L2TP_PWTYPE_PPP_AC: | |
532 | break; | |
533 | case L2TP_PWTYPE_IP: | |
534 | default: | |
535 | ret = -EPROTONOSUPPORT; | |
536 | break; | |
537 | } | |
538 | ||
539 | ret = -EPROTONOSUPPORT; | |
540 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) | |
541 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, | |
542 | session_id, peer_session_id, &cfg); | |
543 | ||
544 | out: | |
545 | return ret; | |
546 | } | |
547 | ||
548 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) | |
549 | { | |
550 | int ret = 0; | |
551 | struct l2tp_session *session; | |
552 | u16 pw_type; | |
553 | ||
554 | session = l2tp_nl_session_find(info); | |
555 | if (session == NULL) { | |
556 | ret = -ENODEV; | |
557 | goto out; | |
558 | } | |
559 | ||
560 | pw_type = session->pwtype; | |
561 | if (pw_type < __L2TP_PWTYPE_MAX) | |
562 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) | |
563 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); | |
564 | ||
565 | out: | |
566 | return ret; | |
567 | } | |
568 | ||
569 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) | |
570 | { | |
571 | int ret = 0; | |
572 | struct l2tp_session *session; | |
573 | ||
574 | session = l2tp_nl_session_find(info); | |
575 | if (session == NULL) { | |
576 | ret = -ENODEV; | |
577 | goto out; | |
578 | } | |
579 | ||
580 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
581 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
582 | ||
583 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
584 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
585 | ||
586 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
587 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
588 | ||
589 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
590 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
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; | |
5de7aee5 JC |
615 | struct l2tp_stats stats; |
616 | unsigned int start; | |
309795f4 JC |
617 | |
618 | sk = tunnel->sock; | |
619 | ||
15e47304 | 620 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); |
7f8436a1 WY |
621 | if (!hdr) |
622 | return -EMSGSIZE; | |
309795f4 | 623 | |
60aed2ab DM |
624 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
625 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || | |
626 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
627 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, | |
628 | session->peer_session_id) || | |
629 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || | |
630 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || | |
631 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || | |
632 | (session->mru && | |
633 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) | |
634 | goto nla_put_failure; | |
635 | ||
e269ed26 | 636 | if ((session->ifname[0] && |
60aed2ab DM |
637 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || |
638 | (session->cookie_len && | |
639 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, | |
640 | &session->cookie[0])) || | |
641 | (session->peer_cookie_len && | |
642 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, | |
643 | &session->peer_cookie[0])) || | |
644 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || | |
645 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || | |
646 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || | |
309795f4 | 647 | #ifdef CONFIG_XFRM |
60aed2ab DM |
648 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
649 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || | |
309795f4 | 650 | #endif |
60aed2ab DM |
651 | (session->reorder_timeout && |
652 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout))) | |
653 | goto nla_put_failure; | |
5de7aee5 | 654 | |
309795f4 JC |
655 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
656 | if (nest == NULL) | |
657 | goto nla_put_failure; | |
5de7aee5 JC |
658 | |
659 | do { | |
660 | start = u64_stats_fetch_begin(&session->stats.syncp); | |
661 | stats.tx_packets = session->stats.tx_packets; | |
662 | stats.tx_bytes = session->stats.tx_bytes; | |
663 | stats.tx_errors = session->stats.tx_errors; | |
664 | stats.rx_packets = session->stats.rx_packets; | |
665 | stats.rx_bytes = session->stats.rx_bytes; | |
666 | stats.rx_errors = session->stats.rx_errors; | |
667 | stats.rx_seq_discards = session->stats.rx_seq_discards; | |
668 | stats.rx_oos_packets = session->stats.rx_oos_packets; | |
669 | } while (u64_stats_fetch_retry(&session->stats.syncp, start)); | |
670 | ||
671 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
672 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
673 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
674 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
675 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 676 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 677 | stats.rx_seq_discards) || |
60aed2ab | 678 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
679 | stats.rx_oos_packets) || |
680 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 681 | goto nla_put_failure; |
309795f4 JC |
682 | nla_nest_end(skb, nest); |
683 | ||
684 | return genlmsg_end(skb, hdr); | |
685 | ||
686 | nla_put_failure: | |
687 | genlmsg_cancel(skb, hdr); | |
688 | return -1; | |
689 | } | |
690 | ||
691 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) | |
692 | { | |
693 | struct l2tp_session *session; | |
694 | struct sk_buff *msg; | |
695 | int ret; | |
696 | ||
697 | session = l2tp_nl_session_find(info); | |
698 | if (session == NULL) { | |
699 | ret = -ENODEV; | |
700 | goto out; | |
701 | } | |
702 | ||
58050fce | 703 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
704 | if (!msg) { |
705 | ret = -ENOMEM; | |
706 | goto out; | |
707 | } | |
708 | ||
15e47304 | 709 | ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq, |
309795f4 JC |
710 | 0, session); |
711 | if (ret < 0) | |
712 | goto err_out; | |
713 | ||
15e47304 | 714 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); |
309795f4 JC |
715 | |
716 | err_out: | |
717 | nlmsg_free(msg); | |
718 | ||
719 | out: | |
720 | return ret; | |
721 | } | |
722 | ||
723 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
724 | { | |
725 | struct net *net = sock_net(skb->sk); | |
726 | struct l2tp_session *session; | |
727 | struct l2tp_tunnel *tunnel = NULL; | |
728 | int ti = cb->args[0]; | |
729 | int si = cb->args[1]; | |
730 | ||
731 | for (;;) { | |
732 | if (tunnel == NULL) { | |
733 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
734 | if (tunnel == NULL) | |
735 | goto out; | |
736 | } | |
737 | ||
738 | session = l2tp_session_find_nth(tunnel, si); | |
739 | if (session == NULL) { | |
740 | ti++; | |
741 | tunnel = NULL; | |
742 | si = 0; | |
743 | continue; | |
744 | } | |
745 | ||
15e47304 | 746 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid, |
309795f4 JC |
747 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
748 | session) <= 0) | |
749 | break; | |
750 | ||
751 | si++; | |
752 | } | |
753 | ||
754 | out: | |
755 | cb->args[0] = ti; | |
756 | cb->args[1] = si; | |
757 | ||
758 | return skb->len; | |
759 | } | |
760 | ||
761 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { | |
762 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, | |
763 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, | |
764 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, | |
765 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, | |
766 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, | |
767 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, | |
768 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, | |
769 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, | |
770 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, | |
771 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, | |
772 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, | |
773 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, | |
774 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, | |
775 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, | |
776 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, | |
777 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, | |
778 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, | |
779 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, | |
780 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, | |
781 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, | |
782 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, | |
783 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, | |
784 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, | |
785 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, | |
786 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, | |
787 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, | |
788 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, | |
789 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, | |
f9bac8df CE |
790 | [L2TP_ATTR_IP6_SADDR] = { |
791 | .type = NLA_BINARY, | |
792 | .len = sizeof(struct in6_addr), | |
793 | }, | |
794 | [L2TP_ATTR_IP6_DADDR] = { | |
795 | .type = NLA_BINARY, | |
796 | .len = sizeof(struct in6_addr), | |
797 | }, | |
309795f4 JC |
798 | [L2TP_ATTR_IFNAME] = { |
799 | .type = NLA_NUL_STRING, | |
800 | .len = IFNAMSIZ - 1, | |
801 | }, | |
802 | [L2TP_ATTR_COOKIE] = { | |
803 | .type = NLA_BINARY, | |
804 | .len = 8, | |
805 | }, | |
806 | [L2TP_ATTR_PEER_COOKIE] = { | |
807 | .type = NLA_BINARY, | |
808 | .len = 8, | |
809 | }, | |
810 | }; | |
811 | ||
812 | static struct genl_ops l2tp_nl_ops[] = { | |
813 | { | |
814 | .cmd = L2TP_CMD_NOOP, | |
815 | .doit = l2tp_nl_cmd_noop, | |
816 | .policy = l2tp_nl_policy, | |
817 | /* can be retrieved by unprivileged users */ | |
818 | }, | |
819 | { | |
820 | .cmd = L2TP_CMD_TUNNEL_CREATE, | |
821 | .doit = l2tp_nl_cmd_tunnel_create, | |
822 | .policy = l2tp_nl_policy, | |
823 | .flags = GENL_ADMIN_PERM, | |
824 | }, | |
825 | { | |
826 | .cmd = L2TP_CMD_TUNNEL_DELETE, | |
827 | .doit = l2tp_nl_cmd_tunnel_delete, | |
828 | .policy = l2tp_nl_policy, | |
829 | .flags = GENL_ADMIN_PERM, | |
830 | }, | |
831 | { | |
832 | .cmd = L2TP_CMD_TUNNEL_MODIFY, | |
833 | .doit = l2tp_nl_cmd_tunnel_modify, | |
834 | .policy = l2tp_nl_policy, | |
835 | .flags = GENL_ADMIN_PERM, | |
836 | }, | |
837 | { | |
838 | .cmd = L2TP_CMD_TUNNEL_GET, | |
839 | .doit = l2tp_nl_cmd_tunnel_get, | |
840 | .dumpit = l2tp_nl_cmd_tunnel_dump, | |
841 | .policy = l2tp_nl_policy, | |
842 | .flags = GENL_ADMIN_PERM, | |
843 | }, | |
844 | { | |
845 | .cmd = L2TP_CMD_SESSION_CREATE, | |
846 | .doit = l2tp_nl_cmd_session_create, | |
847 | .policy = l2tp_nl_policy, | |
848 | .flags = GENL_ADMIN_PERM, | |
849 | }, | |
850 | { | |
851 | .cmd = L2TP_CMD_SESSION_DELETE, | |
852 | .doit = l2tp_nl_cmd_session_delete, | |
853 | .policy = l2tp_nl_policy, | |
854 | .flags = GENL_ADMIN_PERM, | |
855 | }, | |
856 | { | |
857 | .cmd = L2TP_CMD_SESSION_MODIFY, | |
858 | .doit = l2tp_nl_cmd_session_modify, | |
859 | .policy = l2tp_nl_policy, | |
860 | .flags = GENL_ADMIN_PERM, | |
861 | }, | |
862 | { | |
863 | .cmd = L2TP_CMD_SESSION_GET, | |
864 | .doit = l2tp_nl_cmd_session_get, | |
865 | .dumpit = l2tp_nl_cmd_session_dump, | |
866 | .policy = l2tp_nl_policy, | |
867 | .flags = GENL_ADMIN_PERM, | |
868 | }, | |
869 | }; | |
870 | ||
871 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) | |
872 | { | |
873 | int ret; | |
874 | ||
875 | ret = -EINVAL; | |
876 | if (pw_type >= __L2TP_PWTYPE_MAX) | |
877 | goto err; | |
878 | ||
879 | genl_lock(); | |
880 | ret = -EBUSY; | |
881 | if (l2tp_nl_cmd_ops[pw_type]) | |
882 | goto out; | |
883 | ||
884 | l2tp_nl_cmd_ops[pw_type] = ops; | |
8cb49014 | 885 | ret = 0; |
309795f4 JC |
886 | |
887 | out: | |
888 | genl_unlock(); | |
889 | err: | |
8cb49014 | 890 | return ret; |
309795f4 JC |
891 | } |
892 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); | |
893 | ||
894 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) | |
895 | { | |
896 | if (pw_type < __L2TP_PWTYPE_MAX) { | |
897 | genl_lock(); | |
898 | l2tp_nl_cmd_ops[pw_type] = NULL; | |
899 | genl_unlock(); | |
900 | } | |
901 | } | |
902 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); | |
903 | ||
904 | static int l2tp_nl_init(void) | |
905 | { | |
906 | int err; | |
907 | ||
a4ca44fa | 908 | pr_info("L2TP netlink interface\n"); |
309795f4 JC |
909 | err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops, |
910 | ARRAY_SIZE(l2tp_nl_ops)); | |
911 | ||
912 | return err; | |
913 | } | |
914 | ||
915 | static void l2tp_nl_cleanup(void) | |
916 | { | |
917 | genl_unregister_family(&l2tp_nl_family); | |
918 | } | |
919 | ||
920 | module_init(l2tp_nl_init); | |
921 | module_exit(l2tp_nl_cleanup); | |
922 | ||
923 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
924 | MODULE_DESCRIPTION("L2TP netlink"); | |
925 | MODULE_LICENSE("GPL"); | |
926 | MODULE_VERSION("1.0"); | |
e9412c37 | 927 | MODULE_ALIAS_GENL_FAMILY("l2tp"); |