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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 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | |
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); |
127 | |
128 | #if IS_ENABLED(CONFIG_IPV6) |
129 | if (tunnel->sock->sk_family == AF_INET6) { |
130 | const struct ipv6_pinfo *np = inet6_sk(tunnel->sock); |
131 | |
132 | seq_printf(m, " from %pI6c to %pI6c\n", |
133 | &np->saddr, &tunnel->sock->sk_v6_daddr); |
134 | } else |
135 | #endif |
136 | seq_printf(m, " from %pI4 to %pI4\n", |
137 | &inet->inet_saddr, &inet->inet_daddr); |
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 | |
150 | seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n", |
151 | tunnel->debug, |
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)); |
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 | |
207 | seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n", |
208 | session->nr, session->ns, |
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)); |
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 | |
263 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); |
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)) { |
272 | rc = PTR_ERR(pd->net); |
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 | |
331 | pr_info("L2TP debugfs support\n"); |
332 | |
333 | out: |
334 | if (rc) |
335 | pr_warn("unable to init\n"); |
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"); |
353 |
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