/*
* L2TP subsystem debugfs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/hash.h>
#include <linux/l2tp.h>
#include <linux/in.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/inet_hashtables.h>
#include <net/tcp_states.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "l2tp_core.h"
static struct dentry *rootdir;
static struct dentry *tunnels;
struct l2tp_dfs_seq_data {
struct net *net;
int tunnel_idx; /* current tunnel */
int session_idx; /* index of session within current tunnel */
struct l2tp_tunnel *tunnel;
struct l2tp_session *session; /* NULL means get next tunnel */
};
static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
{
pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
pd->tunnel_idx++;
}
static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
{
pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
pd->session_idx++;
if (pd->session == NULL) {
pd->session_idx = 0;
l2tp_dfs_next_tunnel(pd);
}
}
static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
{
struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
loff_t pos = *offs;
if (!pos)
goto out;
BUG_ON(m->private == NULL);
pd = m->private;
if (pd->tunnel == NULL)
l2tp_dfs_next_tunnel(pd);
else
l2tp_dfs_next_session(pd);
/* NULL tunnel and session indicates end of list */
if ((pd->tunnel == NULL) && (pd->session == NULL))
pd = NULL;
out:
return pd;
}
static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
return NULL;
}
static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
{
/* nothing to do */
}
static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
{
struct l2tp_tunnel *tunnel = v;
int session_count = 0;
int hash;
struct hlist_node *walk;
struct hlist_node *tmp;
read_lock_bh(&tunnel->hlist_lock);
for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
struct l2tp_session *session;
session = hlist_entry(walk, struct l2tp_session, hlist);
if (session->session_id == 0)
continue;
session_count++;
}
}
read_unlock_bh(&tunnel->hlist_lock);
seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
if (tunnel->sock) {
struct inet_sock *inet = inet_sk(tunnel->sock);
seq_printf(m, " from %pI4 to %pI4\n",
&inet->inet_saddr, &inet->inet_daddr);
if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
seq_printf(m, " source port %hu, dest port %hu\n",
ntohs(inet->inet_sport), ntohs(inet->inet_dport));
}
seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
"");
seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
atomic_read(&tunnel->ref_count));
seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n",
tunnel->debug,
(unsigned long long)tunnel->stats.tx_packets,
(unsigned long long)tunnel->stats.tx_bytes,
(unsigned long long)tunnel->stats.tx_errors,
(unsigned long long)tunnel->stats.rx_packets,
(unsigned long long)tunnel->stats.rx_bytes,
(unsigned long long)tunnel->stats.rx_errors);
if (tunnel->show != NULL)
tunnel->show(m, tunnel);
}
static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
{
struct l2tp_session *session = v;
seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
session->peer_session_id,
session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
"");
if (session->send_seq || session->recv_seq)
seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
session->mtu, session->mru,
session->recv_seq ? 'R' : '-',
session->send_seq ? 'S' : '-',
session->data_seq == 1 ? "IPSEQ" :
session->data_seq == 2 ? "DATASEQ" : "-",
session->lns_mode ? "LNS" : "LAC",
session->debug,
jiffies_to_msecs(session->reorder_timeout));
seq_printf(m, " offset %hu l2specific %hu/%hu\n",
session->offset, session->l2specific_type, session->l2specific_len);
if (session->cookie_len) {
seq_printf(m, " cookie %02x%02x%02x%02x",
session->cookie[0], session->cookie[1],
session->cookie[2], session->cookie[3]);
if (session->cookie_len == 8)
seq_printf(m, "%02x%02x%02x%02x",
session->cookie[4], session->cookie[5],
session->cookie[6], session->cookie[7]);
seq_printf(m, "\n");
}
if (session->peer_cookie_len) {
seq_printf(m, " peer cookie %02x%02x%02x%02x",
session->peer_cookie[0], session->peer_cookie[1],
session->peer_cookie[2], session->peer_cookie[3]);
if (session->peer_cookie_len == 8)
seq_printf(m, "%02x%02x%02x%02x",
session->peer_cookie[4], session->peer_cookie[5],
session->peer_cookie[6], session->peer_cookie[7]);
seq_printf(m, "\n");
}
seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n",
session->nr, session->ns,
(unsigned long long)session->stats.tx_packets,
(unsigned long long)session->stats.tx_bytes,
(unsigned long long)session->stats.tx_errors,
(unsigned long long)session->stats.rx_packets,
(unsigned long long)session->stats.rx_bytes,
(unsigned long long)session->stats.rx_errors);
if (session->show != NULL)
session->show(m, session);
}
static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
{
struct l2tp_dfs_seq_data *pd = v;
/* display header on line 1 */
if (v == SEQ_START_TOKEN) {
seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
seq_puts(m, " refcnt cnt\n");
seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
seq_puts(m, " [ cookie ]\n");
seq_puts(m, " [ peer cookie ]\n");
seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
goto out;
}
/* Show the tunnel or session context */
if (pd->session == NULL)
l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
else
l2tp_dfs_seq_session_show(m, pd->session);
out:
return 0;
}
static const struct seq_operations l2tp_dfs_seq_ops = {
.start = l2tp_dfs_seq_start,
.next = l2tp_dfs_seq_next,
.stop = l2tp_dfs_seq_stop,
.show = l2tp_dfs_seq_show,
};
static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
{
struct l2tp_dfs_seq_data *pd;
struct seq_file *seq;
int rc = -ENOMEM;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (pd == NULL)
goto out;
/* Derive the network namespace from the pid opening the
* file.
*/
pd->net = get_net_ns_by_pid(current->pid);
if (IS_ERR(pd->net)) {
rc = PTR_ERR(pd->net);
goto err_free_pd;
}
rc = seq_open(file, &l2tp_dfs_seq_ops);
if (rc)
goto err_free_net;
seq = file->private_data;
seq->private = pd;
out:
return rc;
err_free_net:
put_net(pd->net);
err_free_pd:
kfree(pd);
goto out;
}
static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
{
struct l2tp_dfs_seq_data *pd;
struct seq_file *seq;
seq = file->private_data;
pd = seq->private;
