--- /dev/null
+/*
+ * L2TP subsystem debugfs
+ *
+ * Copyright (c) 2010 Katalix Systems Ltd
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (tunnel->sock->sk_family == AF_INET6) {
+ const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
+
+ seq_printf(m, " from %pI6c to %pI6c\n",
+ &np->saddr, &tunnel->sock->sk_v6_daddr);
+ } else
+#endif
+ 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 %ld/%ld/%ld rx %ld/%ld/%ld\n",
+ tunnel->debug,
+ atomic_long_read(&tunnel->stats.tx_packets),
+ atomic_long_read(&tunnel->stats.tx_bytes),
+ atomic_long_read(&tunnel->stats.tx_errors),
+ atomic_long_read(&tunnel->stats.rx_packets),
+ atomic_long_read(&tunnel->stats.rx_bytes),
+ atomic_long_read(&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 %ld/%ld/%ld rx %ld/%ld/%ld\n",
+ session->nr, session->ns,
+ atomic_long_read(&session->stats.tx_packets),
+ atomic_long_read(&session->stats.tx_bytes),
+ atomic_long_read(&session->stats.tx_errors),
+ atomic_long_read(&session->stats.rx_packets),
+ atomic_long_read(&session->stats.rx_bytes),
+ atomic_long_read(&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;
+ if (pd->net)
+ put_net(pd->net);
+ kfree(pd);
+ seq_release(inode, file);
+
+ return 0;
+}
+
+static const struct file_operations l2tp_dfs_fops = {
+ .owner = THIS_MODULE,
+ .open = l2tp_dfs_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = l2tp_dfs_seq_release,
+};
+
+static int __init l2tp_debugfs_init(void)
+{
+ int rc = 0;
+
+ rootdir = debugfs_create_dir("l2tp", NULL);
+ if (IS_ERR(rootdir)) {
+ rc = PTR_ERR(rootdir);
+ rootdir = NULL;
+ goto out;
+ }
+
+ tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
+ if (tunnels == NULL)
+ rc = -EIO;
+
+ pr_info("L2TP debugfs support\n");
+
+out:
+ if (rc)
+ pr_warn("unable to init\n");
+
+ return rc;
+}
+
+static void __exit l2tp_debugfs_exit(void)
+{
+ debugfs_remove(tunnels);
+ debugfs_remove(rootdir);
+}
+
+module_init(l2tp_debugfs_init);
+module_exit(l2tp_debugfs_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP debugfs driver");
+MODULE_VERSION("1.0");
Code Review / kvmfornfv.git / blobdiff