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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
37static struct dentry *rootdir;
38static struct dentry *tunnels;
39
40struct l2tp_dfs_seq_data {
41 struct net *net;
42 int tunnel_idx;
43 int session_idx;
44 struct l2tp_tunnel *tunnel;
45 struct l2tp_session *session;
46};
47
48static 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
54static 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
66static 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
83 if ((pd->tunnel == NULL) && (pd->session == NULL))
84 pd = NULL;
85
86out:
87 return pd;
88}
89
90
91static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
92{
93 (*pos)++;
94 return NULL;
95}
96
97static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
98{
99
100}
101
102static 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 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
131 seq_printf(m, " from %pI6c to %pI6c\n",
132 &np->saddr, &np->daddr);
133 } else
134#endif
135 seq_printf(m, " from %pI4 to %pI4\n",
136 &inet->inet_saddr, &inet->inet_daddr);
137 if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
138 seq_printf(m, " source port %hu, dest port %hu\n",
139 ntohs(inet->inet_sport), ntohs(inet->inet_dport));
140 }
141 seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
142 tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
143 tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
144 "");
145 seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
146 tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
147 atomic_read(&tunnel->ref_count));
148
149 seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n",
150 tunnel->debug,
151 (unsigned long long)tunnel->stats.tx_packets,
152 (unsigned long long)tunnel->stats.tx_bytes,
153 (unsigned long long)tunnel->stats.tx_errors,
154 (unsigned long long)tunnel->stats.rx_packets,
155 (unsigned long long)tunnel->stats.rx_bytes,
156 (unsigned long long)tunnel->stats.rx_errors);
157
158 if (tunnel->show != NULL)
159 tunnel->show(m, tunnel);
160}
161
162static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
163{
164 struct l2tp_session *session = v;
165
166 seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
167 session->peer_session_id,
168 session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
169 session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
170 "");
171 if (session->send_seq || session->recv_seq)
172 seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
173 seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
174 seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
175 session->mtu, session->mru,
176 session->recv_seq ? 'R' : '-',
177 session->send_seq ? 'S' : '-',
178 session->data_seq == 1 ? "IPSEQ" :
179 session->data_seq == 2 ? "DATASEQ" : "-",
180 session->lns_mode ? "LNS" : "LAC",
181 session->debug,
182 jiffies_to_msecs(session->reorder_timeout));
183 seq_printf(m, " offset %hu l2specific %hu/%hu\n",
184 session->offset, session->l2specific_type, session->l2specific_len);
185 if (session->cookie_len) {
186 seq_printf(m, " cookie %02x%02x%02x%02x",
187 session->cookie[0], session->cookie[1],
188 session->cookie[2], session->cookie[3]);
189 if (session->cookie_len == 8)
190 seq_printf(m, "%02x%02x%02x%02x",
191 session->cookie[4], session->cookie[5],
192 session->cookie[6], session->cookie[7]);
193 seq_printf(m, "\n");
194 }
195 if (session->peer_cookie_len) {
196 seq_printf(m, " peer cookie %02x%02x%02x%02x",
197 session->peer_cookie[0], session->peer_cookie[1],
198 session->peer_cookie[2], session->peer_cookie[3]);
199 if (session->peer_cookie_len == 8)
200 seq_printf(m, "%02x%02x%02x%02x",
201 session->peer_cookie[4], session->peer_cookie[5],
202 session->peer_cookie[6], session->peer_cookie[7]);
203 seq_printf(m, "\n");
204 }
205
206 seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n",
207 session->nr, session->ns,
208 (unsigned long long)session->stats.tx_packets,
209 (unsigned long long)session->stats.tx_bytes,
210 (unsigned long long)session->stats.tx_errors,
211 (unsigned long long)session->stats.rx_packets,
212 (unsigned long long)session->stats.rx_bytes,
213 (unsigned long long)session->stats.rx_errors);
214
215 if (session->show != NULL)
216 session->show(m, session);
217}
218
219static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
220{
221 struct l2tp_dfs_seq_data *pd = v;
222
223
224 if (v == SEQ_START_TOKEN) {
225 seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
226 seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
227 seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
228 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
229 seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
230 seq_puts(m, " refcnt cnt\n");
231 seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
232 seq_puts(m, " [ cookie ]\n");
233 seq_puts(m, " [ peer cookie ]\n");
234 seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
235 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
236 goto out;
237 }
238
239
240 if (pd->session == NULL)
241 l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
242 else
243 l2tp_dfs_seq_session_show(m, pd->session);
244
245out:
246 return 0;
247}
248
249static const struct seq_operations l2tp_dfs_seq_ops = {
250 .start = l2tp_dfs_seq_start,
251 .next = l2tp_dfs_seq_next,
252 .stop = l2tp_dfs_seq_stop,
253 .show = l2tp_dfs_seq_show,
254};
255
256static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
257{
258 struct l2tp_dfs_seq_data *pd;
259 struct seq_file *seq;
260 int rc = -ENOMEM;
261
262 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
263 if (pd == NULL)
264 goto out;
265
266
267
268
269 pd->net = get_net_ns_by_pid(current->pid);
270 if (IS_ERR(pd->net)) {
271 rc = PTR_ERR(pd->net);
272 goto err_free_pd;
273 }
274
275 rc = seq_open(file, &l2tp_dfs_seq_ops);
276 if (rc)
277 goto err_free_net;
278
279 seq = file->private_data;
280 seq->private = pd;
281
282out:
283 return rc;
284
285err_free_net:
286 put_net(pd->net);
287err_free_pd:
288 kfree(pd);
289 goto out;
290}
291
292static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
293{
294 struct l2tp_dfs_seq_data *pd;
295 struct seq_file *seq;
296
297 seq = file->private_data;
298 pd = seq->private;
299 if (pd->net)
300 put_net(pd->net);
301 kfree(pd);
302 seq_release(inode, file);
303
304 return 0;
305}
306
307static const struct file_operations l2tp_dfs_fops = {
308 .owner = THIS_MODULE,
309 .open = l2tp_dfs_seq_open,
310 .read = seq_read,
311 .llseek = seq_lseek,
312 .release = l2tp_dfs_seq_release,
313};
314
315static int __init l2tp_debugfs_init(void)
316{
317 int rc = 0;
318
319 rootdir = debugfs_create_dir("l2tp", NULL);
320 if (IS_ERR(rootdir)) {
321 rc = PTR_ERR(rootdir);
322 rootdir = NULL;
323 goto out;
324 }
325
326 tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
327 if (tunnels == NULL)
328 rc = -EIO;
329
330 pr_info("L2TP debugfs support\n");
331
332out:
333 if (rc)
334 pr_warn("unable to init\n");
335
336 return rc;
337}
338
339static void __exit l2tp_debugfs_exit(void)
340{
341 debugfs_remove(tunnels);
342 debugfs_remove(rootdir);
343}
344
345module_init(l2tp_debugfs_init);
346module_exit(l2tp_debugfs_exit);
347
348MODULE_LICENSE("GPL");
349MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
350MODULE_DESCRIPTION("L2TP debugfs driver");
351MODULE_VERSION("1.0");
352
