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-rw-r--r--net/l2tp/l2tp_debugfs.c341
1 files changed, 341 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
new file mode 100644
index 000000000000..104ec3b283d4
--- /dev/null
+++ b/net/l2tp/l2tp_debugfs.c
@@ -0,0 +1,341 @@
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#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/socket.h>
15#include <linux/hash.h>
16#include <linux/l2tp.h>
17#include <linux/in.h>
18#include <linux/etherdevice.h>
19#include <linux/spinlock.h>
20#include <linux/debugfs.h>
21#include <net/sock.h>
22#include <net/ip.h>
23#include <net/icmp.h>
24#include <net/udp.h>
25#include <net/inet_common.h>
26#include <net/inet_hashtables.h>
27#include <net/tcp_states.h>
28#include <net/protocol.h>
29#include <net/xfrm.h>
30#include <net/net_namespace.h>
31#include <net/netns/generic.h>
32
33#include "l2tp_core.h"
34
35static struct dentry *rootdir;
36static struct dentry *tunnels;
37
38struct l2tp_dfs_seq_data {
39 struct net *net;
40 int tunnel_idx; /* current tunnel */
41 int session_idx; /* index of session within current tunnel */
42 struct l2tp_tunnel *tunnel;
43 struct l2tp_session *session; /* NULL means get next tunnel */
44};
45
46static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
47{
48 pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
49 pd->tunnel_idx++;
50}
51
52static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
53{
54 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
55 pd->session_idx++;
56
57 if (pd->session == NULL) {
58 pd->session_idx = 0;
59 l2tp_dfs_next_tunnel(pd);
60 }
61
62}
63
64static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
65{
66 struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
67 loff_t pos = *offs;
68
69 if (!pos)
70 goto out;
71
72 BUG_ON(m->private == NULL);
73 pd = m->private;
74
75 if (pd->tunnel == NULL)
76 l2tp_dfs_next_tunnel(pd);
77 else
78 l2tp_dfs_next_session(pd);
79
80 /* NULL tunnel and session indicates end of list */
81 if ((pd->tunnel == NULL) && (pd->session == NULL))
82 pd = NULL;
83
84out:
85 return pd;
86}
87
88
89static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
90{
91 (*pos)++;
92 return NULL;
93}
94
95static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
96{
97 /* nothing to do */
98}
99
100static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
101{
102 struct l2tp_tunnel *tunnel = v;
103 int session_count = 0;
104 int hash;
105 struct hlist_node *walk;
106 struct hlist_node *tmp;
107
108 read_lock_bh(&tunnel->hlist_lock);
109 for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
110 hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
111 struct l2tp_session *session;
112
113 session = hlist_entry(walk, struct l2tp_session, hlist);
114 if (session->session_id == 0)
115 continue;
116
117 session_count++;
118 }
119 }
120 read_unlock_bh(&tunnel->hlist_lock);
121
122 seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
123 if (tunnel->sock) {
124 struct inet_sock *inet = inet_sk(tunnel->sock);
125 seq_printf(m, " from %pI4 to %pI4\n",
126 &inet->inet_saddr, &inet->inet_daddr);
127 if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
128 seq_printf(m, " source port %hu, dest port %hu\n",
129 ntohs(inet->inet_sport), ntohs(inet->inet_dport));
130 }
131 seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
132 tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
133 tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
134 "");
135 seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
136 tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
137 atomic_read(&tunnel->ref_count));
138
139 seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n",
140 tunnel->debug,
141 (unsigned long long)tunnel->stats.tx_packets,
142 (unsigned long long)tunnel->stats.tx_bytes,
143 (unsigned long long)tunnel->stats.tx_errors,
144 (unsigned long long)tunnel->stats.rx_packets,
145 (unsigned long long)tunnel->stats.rx_bytes,
146 (unsigned long long)tunnel->stats.rx_errors);
147
148 if (tunnel->show != NULL)
149 tunnel->show(m, tunnel);
150}
151
152static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
153{
154 struct l2tp_session *session = v;
155
156 seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
157 session->peer_session_id,
158 session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
159 session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
160 "");
161 if (session->send_seq || session->recv_seq)
162 seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
163 seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
164 seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
165 session->mtu, session->mru,
166 session->recv_seq ? 'R' : '-',
167 session->send_seq ? 'S' : '-',
168 session->data_seq == 1 ? "IPSEQ" :
169 session->data_seq == 2 ? "DATASEQ" : "-",
170 session->lns_mode ? "LNS" : "LAC",
171 session->debug,
172 jiffies_to_msecs(session->reorder_timeout));
173 seq_printf(m, " offset %hu l2specific %hu/%hu\n",
174 session->offset, session->l2specific_type, session->l2specific_len);
175 if (session->cookie_len) {
176 seq_printf(m, " cookie %02x%02x%02x%02x",
177 session->cookie[0], session->cookie[1],
178 session->cookie[2], session->cookie[3]);
179 if (session->cookie_len == 8)
180 seq_printf(m, "%02x%02x%02x%02x",
181 session->cookie[4], session->cookie[5],
182 session->cookie[6], session->cookie[7]);
183 seq_printf(m, "\n");
184 }
185 if (session->peer_cookie_len) {
186 seq_printf(m, " peer cookie %02x%02x%02x%02x",
187 session->peer_cookie[0], session->peer_cookie[1],
188 session->peer_cookie[2], session->peer_cookie[3]);
189 if (session->peer_cookie_len == 8)
190 seq_printf(m, "%02x%02x%02x%02x",
191 session->peer_cookie[4], session->peer_cookie[5],
192 session->peer_cookie[6], session->peer_cookie[7]);
193 seq_printf(m, "\n");
194 }
195
196 seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n",
197 session->nr, session->ns,
198 (unsigned long long)session->stats.tx_packets,
199 (unsigned long long)session->stats.tx_bytes,
200 (unsigned long long)session->stats.tx_errors,
201 (unsigned long long)session->stats.rx_packets,
202 (unsigned long long)session->stats.rx_bytes,
203 (unsigned long long)session->stats.rx_errors);
204
205 if (session->show != NULL)
206 session->show(m, session);
207}
208
209static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
210{
211 struct l2tp_dfs_seq_data *pd = v;
212
213 /* display header on line 1 */
214 if (v == SEQ_START_TOKEN) {
215 seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
216 seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
217 seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
218 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
219 seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
220 seq_puts(m, " refcnt cnt\n");
221 seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
222 seq_puts(m, " [ cookie ]\n");
223 seq_puts(m, " [ peer cookie ]\n");
224 seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
225 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
226 goto out;
227 }
228
229 /* Show the tunnel or session context */
230 if (pd->session == NULL)
231 l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
232 else
233 l2tp_dfs_seq_session_show(m, pd->session);
234
235out:
236 return 0;
237}
238
239static const struct seq_operations l2tp_dfs_seq_ops = {
240 .start = l2tp_dfs_seq_start,
241 .next = l2tp_dfs_seq_next,
242 .stop = l2tp_dfs_seq_stop,
243 .show = l2tp_dfs_seq_show,
244};
245
246static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
247{
248 struct l2tp_dfs_seq_data *pd;
249 struct seq_file *seq;
250 int rc = -ENOMEM;
251
252 pd = kzalloc(GFP_KERNEL, sizeof(*pd));
253 if (pd == NULL)
254 goto out;
255
256 /* Derive the network namespace from the pid opening the
257 * file.
258 */
259 pd->net = get_net_ns_by_pid(current->pid);
260 if (IS_ERR(pd->net)) {
261 rc = -PTR_ERR(pd->net);
262 goto err_free_pd;
263 }
264
265 rc = seq_open(file, &l2tp_dfs_seq_ops);
266 if (rc)
267 goto err_free_net;
268
269 seq = file->private_data;
270 seq->private = pd;
271
272out:
273 return rc;
274
275err_free_net:
276 put_net(pd->net);
277err_free_pd:
278 kfree(pd);
279 goto out;
280}
281
282static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
283{
284 struct l2tp_dfs_seq_data *pd;
285 struct seq_file *seq;
286
287 seq = file->private_data;
288 pd = seq->private;
289 if (pd->net)
290 put_net(pd->net);
291 kfree(pd);
292 seq_release(inode, file);
293
294 return 0;
295}
296
297static const struct file_operations l2tp_dfs_fops = {
298 .owner = THIS_MODULE,
299 .open = l2tp_dfs_seq_open,
300 .read = seq_read,
301 .llseek = seq_lseek,
302 .release = l2tp_dfs_seq_release,
303};
304
305static int __init l2tp_debugfs_init(void)
306{
307 int rc = 0;
308
309 rootdir = debugfs_create_dir("l2tp", NULL);
310 if (IS_ERR(rootdir)) {
311 rc = PTR_ERR(rootdir);
312 rootdir = NULL;
313 goto out;
314 }
315
316 tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
317 if (tunnels == NULL)
318 rc = -EIO;
319
320 printk(KERN_INFO "L2TP debugfs support\n");
321
322out:
323 if (rc)
324 printk(KERN_WARNING "l2tp debugfs: unable to init\n");
325
326 return rc;
327}
328
329static void __exit l2tp_debugfs_exit(void)
330{
331 debugfs_remove(tunnels);
332 debugfs_remove(rootdir);
333}
334
335module_init(l2tp_debugfs_init);
336module_exit(l2tp_debugfs_exit);
337
338MODULE_LICENSE("GPL");
339MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
340MODULE_DESCRIPTION("L2TP debugfs driver");
341MODULE_VERSION("1.0");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-08 11:56:25 -0500