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0ad66140 JC |
1 | /* |
2 | * L2TP subsystem debugfs | |
3 | * | |
4 | * Copyright (c) 2010 Katalix Systems Ltd | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
a4ca44fa JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
0ad66140 JC |
14 | #include <linux/module.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/socket.h> | |
17 | #include <linux/hash.h> | |
18 | #include <linux/l2tp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/debugfs.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/ip.h> | |
25 | #include <net/icmp.h> | |
26 | #include <net/udp.h> | |
27 | #include <net/inet_common.h> | |
28 | #include <net/inet_hashtables.h> | |
29 | #include <net/tcp_states.h> | |
30 | #include <net/protocol.h> | |
31 | #include <net/xfrm.h> | |
32 | #include <net/net_namespace.h> | |
33 | #include <net/netns/generic.h> | |
34 | ||
35 | #include "l2tp_core.h" | |
36 | ||
37 | static struct dentry *rootdir; | |
38 | static struct dentry *tunnels; | |
39 | ||
40 | struct l2tp_dfs_seq_data { | |
41 | struct net *net; | |
42 | int tunnel_idx; /* current tunnel */ | |
43 | int session_idx; /* index of session within current tunnel */ | |
44 | struct l2tp_tunnel *tunnel; | |
45 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
46 | }; | |
47 | ||
48 | static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd) | |
49 | { | |
50 | pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx); | |
51 | pd->tunnel_idx++; | |
52 | } | |
53 | ||
54 | static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd) | |
55 | { | |
56 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
57 | pd->session_idx++; | |
58 | ||
59 | if (pd->session == NULL) { | |
60 | pd->session_idx = 0; | |
61 | l2tp_dfs_next_tunnel(pd); | |
62 | } | |
63 | ||
64 | } | |
65 | ||
66 | static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs) | |
67 | { | |
68 | struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN; | |
69 | loff_t pos = *offs; | |
70 | ||
71 | if (!pos) | |
72 | goto out; | |
73 | ||
74 | BUG_ON(m->private == NULL); | |
75 | pd = m->private; | |
76 | ||
77 | if (pd->tunnel == NULL) | |
78 | l2tp_dfs_next_tunnel(pd); | |
79 | else | |
80 | l2tp_dfs_next_session(pd); | |
81 | ||
82 | /* NULL tunnel and session indicates end of list */ | |
83 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
84 | pd = NULL; | |
85 | ||
86 | out: | |
87 | return pd; | |
88 | } | |
89 | ||
90 | ||
91 | static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
92 | { | |
93 | (*pos)++; | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | static void l2tp_dfs_seq_stop(struct seq_file *p, void *v) | |
98 | { | |
99 | /* nothing to do */ | |
100 | } | |
101 | ||
102 | static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v) | |
103 | { | |
104 | struct l2tp_tunnel *tunnel = v; | |
105 | int session_count = 0; | |
106 | int hash; | |
107 | struct hlist_node *walk; | |
108 | struct hlist_node *tmp; | |
109 | ||
110 | read_lock_bh(&tunnel->hlist_lock); | |
111 | for (hash = 0; hash < L2TP_HASH_SIZE; hash++) { | |
112 | hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) { | |
113 | struct l2tp_session *session; | |
114 | ||
115 | session = hlist_entry(walk, struct l2tp_session, hlist); | |
116 | if (session->session_id == 0) | |
117 | continue; | |
118 | ||
119 | session_count++; | |
120 | } | |
121 | } | |
122 | read_unlock_bh(&tunnel->hlist_lock); | |
123 | ||
124 | seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id); | |
125 | if (tunnel->sock) { | |
126 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
2121c3f5 CE |
127 | |
128 | #if IS_ENABLED(CONFIG_IPV6) | |
129 | if (tunnel->sock->sk_family == AF_INET6) { | |
efe4208f ED |
130 | const struct ipv6_pinfo *np = inet6_sk(tunnel->sock); |
131 | ||
2121c3f5 | 132 | seq_printf(m, " from %pI6c to %pI6c\n", |
efe4208f | 133 | &np->saddr, &tunnel->sock->sk_v6_daddr); |
2121c3f5 CE |
134 | } else |
135 | #endif | |
a4fbf841 JP |
136 | seq_printf(m, " from %pI4 to %pI4\n", |
137 | &inet->inet_saddr, &inet->inet_daddr); | |
0ad66140 JC |
138 | if (tunnel->encap == L2TP_ENCAPTYPE_UDP) |
139 | seq_printf(m, " source port %hu, dest port %hu\n", | |
140 | ntohs(inet->inet_sport), ntohs(inet->inet_dport)); | |
141 | } | |
142 | seq_printf(m, " L2TPv%d, %s\n", tunnel->version, | |
143 | tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" : | |
144 | tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" : | |
145 | ""); | |
146 | seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count, | |
147 | tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0, | |
148 | atomic_read(&tunnel->ref_count)); | |
149 | ||
7b7c0719 | 150 | seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n", |
0ad66140 | 151 | tunnel->debug, |
7b7c0719 TP |
152 | atomic_long_read(&tunnel->stats.tx_packets), |
153 | atomic_long_read(&tunnel->stats.tx_bytes), | |
154 | atomic_long_read(&tunnel->stats.tx_errors), | |
155 | atomic_long_read(&tunnel->stats.rx_packets), | |
156 | atomic_long_read(&tunnel->stats.rx_bytes), | |
157 | atomic_long_read(&tunnel->stats.rx_errors)); | |
0ad66140 JC |
158 | |
159 | if (tunnel->show != NULL) | |
160 | tunnel->show(m, tunnel); | |
161 | } | |
162 | ||
163 | static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v) | |
164 | { | |
165 | struct l2tp_session *session = v; | |
166 | ||
167 | seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id, | |
168 | session->peer_session_id, | |
169 | session->pwtype == L2TP_PWTYPE_ETH ? "ETH" : | |
170 | session->pwtype == L2TP_PWTYPE_PPP ? "PPP" : | |
171 | ""); | |
172 | if (session->send_seq || session->recv_seq) | |
173 | seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns); | |
174 | seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count)); | |
175 | seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n", | |
176 | session->mtu, session->mru, | |
177 | session->recv_seq ? 'R' : '-', | |
178 | session->send_seq ? 'S' : '-', | |
179 | session->data_seq == 1 ? "IPSEQ" : | |
180 | session->data_seq == 2 ? "DATASEQ" : "-", | |
181 | session->lns_mode ? "LNS" : "LAC", | |
182 | session->debug, | |
183 | jiffies_to_msecs(session->reorder_timeout)); | |
184 | seq_printf(m, " offset %hu l2specific %hu/%hu\n", | |
185 | session->offset, session->l2specific_type, session->l2specific_len); | |
186 | if (session->cookie_len) { | |
187 | seq_printf(m, " cookie %02x%02x%02x%02x", | |
188 | session->cookie[0], session->cookie[1], | |
189 | session->cookie[2], session->cookie[3]); | |
190 | if (session->cookie_len == 8) | |
191 | seq_printf(m, "%02x%02x%02x%02x", | |
192 | session->cookie[4], session->cookie[5], | |
193 | session->cookie[6], session->cookie[7]); | |
194 | seq_printf(m, "\n"); | |
195 | } | |
196 | if (session->peer_cookie_len) { | |
197 | seq_printf(m, " peer cookie %02x%02x%02x%02x", | |
198 | session->peer_cookie[0], session->peer_cookie[1], | |
199 | session->peer_cookie[2], session->peer_cookie[3]); | |
200 | if (session->peer_cookie_len == 8) | |
201 | seq_printf(m, "%02x%02x%02x%02x", | |
202 | session->peer_cookie[4], session->peer_cookie[5], | |
203 | session->peer_cookie[6], session->peer_cookie[7]); | |
204 | seq_printf(m, "\n"); | |
205 | } | |
206 | ||
7b7c0719 | 207 | seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n", |
0ad66140 | 208 | session->nr, session->ns, |
7b7c0719 TP |
209 | atomic_long_read(&session->stats.tx_packets), |
210 | atomic_long_read(&session->stats.tx_bytes), | |
211 | atomic_long_read(&session->stats.tx_errors), | |
212 | atomic_long_read(&session->stats.rx_packets), | |
213 | atomic_long_read(&session->stats.rx_bytes), | |
214 | atomic_long_read(&session->stats.rx_errors)); | |
0ad66140 JC |
215 | |
216 | if (session->show != NULL) | |
217 | session->show(m, session); | |
218 | } | |
219 | ||
220 | static int l2tp_dfs_seq_show(struct seq_file *m, void *v) | |
221 | { | |
222 | struct l2tp_dfs_seq_data *pd = v; | |
223 | ||
224 | /* display header on line 1 */ | |
225 | if (v == SEQ_START_TOKEN) { | |
226 | seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n"); | |
227 | seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n"); | |
228 | seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n"); | |
229 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
230 | seq_puts(m, " SESSION ID, peer ID, PWTYPE\n"); | |
231 | seq_puts(m, " refcnt cnt\n"); | |
232 | seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n"); | |
233 | seq_puts(m, " [ cookie ]\n"); | |
234 | seq_puts(m, " [ peer cookie ]\n"); | |
235 | seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n"); | |
236 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
237 | goto out; | |
238 | } | |
239 | ||
240 | /* Show the tunnel or session context */ | |
241 | if (pd->session == NULL) | |
242 | l2tp_dfs_seq_tunnel_show(m, pd->tunnel); | |
243 | else | |
244 | l2tp_dfs_seq_session_show(m, pd->session); | |
245 | ||
246 | out: | |
247 | return 0; | |
248 | } | |
249 | ||
250 | static const struct seq_operations l2tp_dfs_seq_ops = { | |
251 | .start = l2tp_dfs_seq_start, | |
252 | .next = l2tp_dfs_seq_next, | |
253 | .stop = l2tp_dfs_seq_stop, | |
254 | .show = l2tp_dfs_seq_show, | |
255 | }; | |
256 | ||
257 | static int l2tp_dfs_seq_open(struct inode *inode, struct file *file) | |
258 | { | |
259 | struct l2tp_dfs_seq_data *pd; | |
260 | struct seq_file *seq; | |
261 | int rc = -ENOMEM; | |
262 | ||
6f9b9018 | 263 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); |
0ad66140 JC |
264 | if (pd == NULL) |
265 | goto out; | |
266 | ||
267 | /* Derive the network namespace from the pid opening the | |
268 | * file. | |
269 | */ | |
270 | pd->net = get_net_ns_by_pid(current->pid); | |
271 | if (IS_ERR(pd->net)) { | |
b8f07a06 | 272 | rc = PTR_ERR(pd->net); |
0ad66140 JC |
273 | goto err_free_pd; |
274 | } | |
275 | ||
276 | rc = seq_open(file, &l2tp_dfs_seq_ops); | |
277 | if (rc) | |
278 | goto err_free_net; | |
279 | ||
280 | seq = file->private_data; | |
281 | seq->private = pd; | |
282 | ||
283 | out: | |
284 | return rc; | |
285 | ||
286 | err_free_net: | |
287 | put_net(pd->net); | |
288 | err_free_pd: | |
289 | kfree(pd); | |
290 | goto out; | |
291 | } | |
292 | ||
293 | static int l2tp_dfs_seq_release(struct inode *inode, struct file *file) | |
294 | { | |
295 | struct l2tp_dfs_seq_data *pd; | |
296 | struct seq_file *seq; | |
297 | ||
298 | seq = file->private_data; | |
299 | pd = seq->private; | |
300 | if (pd->net) | |
301 | put_net(pd->net); | |
302 | kfree(pd); | |
303 | seq_release(inode, file); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static const struct file_operations l2tp_dfs_fops = { | |
309 | .owner = THIS_MODULE, | |
310 | .open = l2tp_dfs_seq_open, | |
311 | .read = seq_read, | |
312 | .llseek = seq_lseek, | |
313 | .release = l2tp_dfs_seq_release, | |
314 | }; | |
315 | ||
316 | static int __init l2tp_debugfs_init(void) | |
317 | { | |
318 | int rc = 0; | |
319 | ||
320 | rootdir = debugfs_create_dir("l2tp", NULL); | |
321 | if (IS_ERR(rootdir)) { | |
322 | rc = PTR_ERR(rootdir); | |
323 | rootdir = NULL; | |
324 | goto out; | |
325 | } | |
326 | ||
327 | tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops); | |
328 | if (tunnels == NULL) | |
329 | rc = -EIO; | |
330 | ||
a4ca44fa | 331 | pr_info("L2TP debugfs support\n"); |
0ad66140 JC |
332 | |
333 | out: | |
334 | if (rc) | |
a4ca44fa | 335 | pr_warn("unable to init\n"); |
0ad66140 JC |
336 | |
337 | return rc; | |
338 | } | |
339 | ||
340 | static void __exit l2tp_debugfs_exit(void) | |
341 | { | |
342 | debugfs_remove(tunnels); | |
343 | debugfs_remove(rootdir); | |
344 | } | |
345 | ||
346 | module_init(l2tp_debugfs_init); | |
347 | module_exit(l2tp_debugfs_exit); | |
348 | ||
349 | MODULE_LICENSE("GPL"); | |
350 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
351 | MODULE_DESCRIPTION("L2TP debugfs driver"); | |
352 | MODULE_VERSION("1.0"); |