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l2tp: Add debugfs files for dumping l2tp debug info

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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
2010-04-02 06:19:33 +00:00
committed by David S. Miller
parent d9e31d17ce
commit 0ad6614048
6 changed files with 392 additions and 2 deletions
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14
net/l2tp/l2tp_eth.c
View File

@@ -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);
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;