l2tp: Add debugfs files for dumping l2tp debug info
The existing pppol2tp driver exports debug info to /proc/net/pppol2tp. Rather than adding info to that file for the new functionality added in this patch series, we add new files in debugfs, leaving the old /proc file for backwards compatibility (L2TPv2 only). Currently only one file is provided: l2tp/tunnels, which lists internal debug info for all l2tp tunnels and sessions. More files may be added later. The info is for debug and problem analysis only - userspace apps should use netlink to obtain status about l2tp tunnels and sessions. Although debugfs does not support net namespaces, the tunnels and sessions dumped in l2tp/tunnels are only those in the net namespace of the process reading the file. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman
David S. Miller
Родитель
d9e31d17ce
Коммит
0ad6614048
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@ -31,6 +31,19 @@ menuconfig L2TP
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If you don't need L2TP, say N. To compile all L2TP code as
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modules, choose M here.
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config L2TP_DEBUGFS
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tristate "L2TP debugfs support"
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depends on L2TP && DEBUG_FS
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help
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Support for l2tp directory in debugfs filesystem. This may be
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used to dump internal state of the l2tp drivers for problem
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analysis.
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If unsure, say 'Y'.
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To compile this driver as a module, choose M here. The module
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will be called l2tp_debugfs.
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config L2TP_V3
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bool "L2TPv3 support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && L2TP
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@ -9,3 +9,4 @@ obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_PPPOL2TP)) += l2tp_ppp.o
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obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip.o
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obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_V3)) += l2tp_netlink.o
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obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_ETH)) += l2tp_eth.o
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obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_DEBUGFS)) += l2tp_debugfs.o
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@ -133,7 +133,9 @@ struct l2tp_session {
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void (*session_close)(struct l2tp_session *session);
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void (*ref)(struct l2tp_session *session);
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void (*deref)(struct l2tp_session *session);
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#ifdef CONFIG_L2TP_DEBUGFS
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void (*show)(struct seq_file *m, void *priv);
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#endif
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uint8_t priv[0]; /* private data */
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};
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@ -166,7 +168,9 @@ struct l2tp_tunnel {
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struct net *l2tp_net; /* the net we belong to */
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atomic_t ref_count;
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#ifdef CONFIG_DEBUG_FS
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void (*show)(struct seq_file *m, void *arg);
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#endif
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int (*recv_payload_hook)(struct sk_buff *skb);
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void (*old_sk_destruct)(struct sock *);
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struct sock *sock; /* Parent socket */
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@ -0,0 +1,341 @@
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/*
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* L2TP subsystem debugfs
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*
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* Copyright (c) 2010 Katalix Systems Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/hash.h>
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#include <linux/l2tp.h>
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#include <linux/in.h>
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#include <linux/etherdevice.h>
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#include <linux/spinlock.h>
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#include <linux/debugfs.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/tcp_states.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include "l2tp_core.h"
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static struct dentry *rootdir;
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static struct dentry *tunnels;
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struct l2tp_dfs_seq_data {
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struct net *net;
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int tunnel_idx; /* current tunnel */
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int session_idx; /* index of session within current tunnel */
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struct l2tp_tunnel *tunnel;
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struct l2tp_session *session; /* NULL means get next tunnel */
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};
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static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
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{
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pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
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pd->tunnel_idx++;
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}
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static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
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{
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pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
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pd->session_idx++;
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if (pd->session == NULL) {
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pd->session_idx = 0;
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l2tp_dfs_next_tunnel(pd);
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}
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}
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static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
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{
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struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
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loff_t pos = *offs;
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if (!pos)
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goto out;
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BUG_ON(m->private == NULL);
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pd = m->private;
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if (pd->tunnel == NULL)
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l2tp_dfs_next_tunnel(pd);
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else
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l2tp_dfs_next_session(pd);
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/* NULL tunnel and session indicates end of list */
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if ((pd->tunnel == NULL) && (pd->session == NULL))
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pd = NULL;
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out:
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return pd;
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}
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static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
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{
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(*pos)++;
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return NULL;
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}
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static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
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{
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/* nothing to do */
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}
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static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
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{
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struct l2tp_tunnel *tunnel = v;
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int session_count = 0;
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int hash;
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struct hlist_node *walk;
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struct hlist_node *tmp;
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read_lock_bh(&tunnel->hlist_lock);
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for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
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hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
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struct l2tp_session *session;
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session = hlist_entry(walk, struct l2tp_session, hlist);
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if (session->session_id == 0)
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continue;
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session_count++;
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}
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}
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read_unlock_bh(&tunnel->hlist_lock);
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seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
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if (tunnel->sock) {
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struct inet_sock *inet = inet_sk(tunnel->sock);
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seq_printf(m, " from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n",
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NIPQUAD(inet->inet_saddr), NIPQUAD(inet->inet_daddr));
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if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
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seq_printf(m, " source port %hu, dest port %hu\n",
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ntohs(inet->inet_sport), ntohs(inet->inet_dport));
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}
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seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
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tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
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tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
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"");
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seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
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tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
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atomic_read(&tunnel->ref_count));
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seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n",
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tunnel->debug,
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(unsigned long long)tunnel->stats.tx_packets,
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(unsigned long long)tunnel->stats.tx_bytes,
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(unsigned long long)tunnel->stats.tx_errors,
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(unsigned long long)tunnel->stats.rx_packets,
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(unsigned long long)tunnel->stats.rx_bytes,
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(unsigned long long)tunnel->stats.rx_errors);
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if (tunnel->show != NULL)
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tunnel->show(m, tunnel);
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}
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static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
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{
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struct l2tp_session *session = v;
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seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
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session->peer_session_id,
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session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
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session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
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"");
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if (session->send_seq || session->recv_seq)
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seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
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seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
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seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
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session->mtu, session->mru,
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session->recv_seq ? 'R' : '-',
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session->send_seq ? 'S' : '-',
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session->data_seq == 1 ? "IPSEQ" :
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session->data_seq == 2 ? "DATASEQ" : "-",
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session->lns_mode ? "LNS" : "LAC",
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session->debug,
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jiffies_to_msecs(session->reorder_timeout));
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seq_printf(m, " offset %hu l2specific %hu/%hu\n",
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session->offset, session->l2specific_type, session->l2specific_len);
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if (session->cookie_len) {
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seq_printf(m, " cookie %02x%02x%02x%02x",
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session->cookie[0], session->cookie[1],
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session->cookie[2], session->cookie[3]);
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if (session->cookie_len == 8)
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seq_printf(m, "%02x%02x%02x%02x",
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session->cookie[4], session->cookie[5],
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session->cookie[6], session->cookie[7]);
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seq_printf(m, "\n");
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}
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if (session->peer_cookie_len) {
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seq_printf(m, " peer cookie %02x%02x%02x%02x",
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session->peer_cookie[0], session->peer_cookie[1],
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session->peer_cookie[2], session->peer_cookie[3]);
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if (session->peer_cookie_len == 8)
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seq_printf(m, "%02x%02x%02x%02x",
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session->peer_cookie[4], session->peer_cookie[5],
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session->peer_cookie[6], session->peer_cookie[7]);
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seq_printf(m, "\n");
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}
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seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n",
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session->nr, session->ns,
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(unsigned long long)session->stats.tx_packets,
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(unsigned long long)session->stats.tx_bytes,
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(unsigned long long)session->stats.tx_errors,
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(unsigned long long)session->stats.rx_packets,
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(unsigned long long)session->stats.rx_bytes,
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(unsigned long long)session->stats.rx_errors);
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if (session->show != NULL)
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session->show(m, session);
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}
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static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
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{
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struct l2tp_dfs_seq_data *pd = v;
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/* display header on line 1 */
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if (v == SEQ_START_TOKEN) {
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seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
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seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
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seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
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seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
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seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
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seq_puts(m, " refcnt cnt\n");
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seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
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seq_puts(m, " [ cookie ]\n");
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seq_puts(m, " [ peer cookie ]\n");
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seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
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seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
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goto out;
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}
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/* Show the tunnel or session context */
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if (pd->session == NULL)
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l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
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else
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l2tp_dfs_seq_session_show(m, pd->session);
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out:
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return 0;
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}
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static const struct seq_operations l2tp_dfs_seq_ops = {
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.start = l2tp_dfs_seq_start,
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.next = l2tp_dfs_seq_next,
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.stop = l2tp_dfs_seq_stop,
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.show = l2tp_dfs_seq_show,
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};
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static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
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{
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struct l2tp_dfs_seq_data *pd;
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struct seq_file *seq;
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int rc = -ENOMEM;
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pd = kzalloc(GFP_KERNEL, sizeof(*pd));
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if (pd == NULL)
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goto out;
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/* Derive the network namespace from the pid opening the
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* file.
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*/
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pd->net = get_net_ns_by_pid(current->pid);
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if (IS_ERR(pd->net)) {
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rc = -PTR_ERR(pd->net);
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goto err_free_pd;
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}
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rc = seq_open(file, &l2tp_dfs_seq_ops);
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if (rc)
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goto err_free_net;
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seq = file->private_data;
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seq->private = pd;
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out:
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return rc;
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err_free_net:
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put_net(pd->net);
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err_free_pd:
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kfree(pd);
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goto out;
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}
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static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
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{
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struct l2tp_dfs_seq_data *pd;
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struct seq_file *seq;
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seq = file->private_data;
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pd = seq->private;
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if (pd->net)
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put_net(pd->net);
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kfree(pd);
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seq_release(inode, file);
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return 0;
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}
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static const struct file_operations l2tp_dfs_fops = {
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.owner = THIS_MODULE,
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.open = l2tp_dfs_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = l2tp_dfs_seq_release,
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};
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static int __init l2tp_debugfs_init(void)
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{
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int rc = 0;
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rootdir = debugfs_create_dir("l2tp", NULL);
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if (IS_ERR(rootdir)) {
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rc = PTR_ERR(rootdir);
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rootdir = NULL;
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goto out;
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}
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tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
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if (tunnels == NULL)
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rc = -EIO;
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printk(KERN_INFO "L2TP debugfs support\n");
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out:
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if (rc)
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printk(KERN_WARNING "l2tp debugfs: unable to init\n");
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|
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return rc;
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}
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|
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static void __exit l2tp_debugfs_exit(void)
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{
|
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debugfs_remove(tunnels);
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debugfs_remove(rootdir);
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}
|
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|
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module_init(l2tp_debugfs_init);
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module_exit(l2tp_debugfs_exit);
|
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|
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MODULE_LICENSE("GPL");
|
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MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
|
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MODULE_DESCRIPTION("L2TP debugfs driver");
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MODULE_VERSION("1.0");
|
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|
|
@ -172,6 +172,17 @@ static void l2tp_eth_delete(struct l2tp_session *session)
|
|||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_L2TP_DEBUGFS
|
||||
static void l2tp_eth_show(struct seq_file *m, void *arg)
|
||||
{
|
||||
struct l2tp_session *session = arg;
|
||||
struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
|
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struct net_device *dev = spriv->dev;
|
||||
|
||||
seq_printf(m, " interface %s\n", dev->name);
|
||||
}
|
||||
#endif
|
||||
|
||||
static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
|
||||
{
|
||||
struct net_device *dev;
|
||||
|
|
@ -233,6 +244,9 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
|
|||
priv->tunnel_sock = tunnel->sock;
|
||||
session->recv_skb = l2tp_eth_dev_recv;
|
||||
session->session_close = l2tp_eth_delete;
|
||||
#ifdef CONFIG_L2TP_DEBUGFS
|
||||
session->show = l2tp_eth_show;
|
||||
#endif
|
||||
|
||||
spriv = l2tp_session_priv(session);
|
||||
spriv->dev = dev;
|
||||
|
|
|
|||
|
|
@ -597,6 +597,20 @@ out:
|
|||
return error;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_L2TP_DEBUGFS
|
||||
static void pppol2tp_show(struct seq_file *m, void *arg)
|
||||
{
|
||||
struct l2tp_session *session = arg;
|
||||
struct pppol2tp_session *ps = l2tp_session_priv(session);
|
||||
|
||||
if (ps) {
|
||||
struct pppox_sock *po = pppox_sk(ps->sock);
|
||||
if (po)
|
||||
seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
/* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
|
||||
*/
|
||||
static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
|
||||
|
|
@ -734,6 +748,9 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
|
|||
|
||||
session->recv_skb = pppol2tp_recv;
|
||||
session->session_close = pppol2tp_session_close;
|
||||
#ifdef CONFIG_L2TP_DEBUGFS
|
||||
session->show = pppol2tp_show;
|
||||
#endif
|
||||
|
||||
/* We need to know each time a skb is dropped from the reorder
|
||||
* queue.
|
||||
|
|
|
|||
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