mirror of https://github.com/hak5/openwrt.git
90 lines
2.9 KiB
Diff
90 lines
2.9 KiB
Diff
From: Simon Farnsworth <simon@farnz.org.uk>
|
|
Date: Sun, 1 Mar 2015 10:54:39 +0000
|
|
Subject: [PATCH] pppoe: Use workqueue to die properly when a PADT is received
|
|
|
|
When a PADT frame is received, the socket may not be in a good state to
|
|
close down the PPP interface. The current implementation handles this by
|
|
simply blocking all further PPP traffic, and hoping that the lack of traffic
|
|
will trigger the user to investigate.
|
|
|
|
Use schedule_work to get to a process context from which we clear down the
|
|
PPP interface, in a fashion analogous to hangup on a TTY-based PPP
|
|
interface. This causes pppd to disconnect immediately, and allows tools to
|
|
take immediate corrective action.
|
|
|
|
Note that pppd's rp_pppoe.so plugin has code in it to disable the session
|
|
when it disconnects; however, as a consequence of this patch, the session is
|
|
already disabled before rp_pppoe.so is asked to disable the session. The
|
|
result is a harmless error message:
|
|
|
|
Failed to disconnect PPPoE socket: 114 Operation already in progress
|
|
|
|
This message is safe to ignore, as long as the error is 114 Operation
|
|
already in progress; in that specific case, it means that the PPPoE session
|
|
has already been disabled before pppd tried to disable it.
|
|
|
|
Signed-off-by: Simon Farnsworth <simon@farnz.org.uk>
|
|
Tested-by: Dan Williams <dcbw@redhat.com>
|
|
Tested-by: Christoph Schulz <develop@kristov.de>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
|
|
--- a/drivers/net/ppp/pppoe.c
|
|
+++ b/drivers/net/ppp/pppoe.c
|
|
@@ -455,6 +455,18 @@ out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
+static void pppoe_unbind_sock_work(struct work_struct *work)
|
|
+{
|
|
+ struct pppox_sock *po = container_of(work, struct pppox_sock,
|
|
+ proto.pppoe.padt_work);
|
|
+ struct sock *sk = sk_pppox(po);
|
|
+
|
|
+ lock_sock(sk);
|
|
+ pppox_unbind_sock(sk);
|
|
+ release_sock(sk);
|
|
+ sock_put(sk);
|
|
+}
|
|
+
|
|
/************************************************************************
|
|
*
|
|
* Receive a PPPoE Discovery frame.
|
|
@@ -500,7 +512,8 @@ static int pppoe_disc_rcv(struct sk_buff
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
- sock_put(sk);
|
|
+ if (!schedule_work(&po->proto.pppoe.padt_work))
|
|
+ sock_put(sk);
|
|
}
|
|
|
|
abort:
|
|
@@ -613,6 +626,8 @@ static int pppoe_connect(struct socket *
|
|
|
|
lock_sock(sk);
|
|
|
|
+ INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work);
|
|
+
|
|
error = -EINVAL;
|
|
if (sp->sa_protocol != PX_PROTO_OE)
|
|
goto end;
|
|
--- a/include/linux/if_pppox.h
|
|
+++ b/include/linux/if_pppox.h
|
|
@@ -19,6 +19,7 @@
|
|
#include <linux/netdevice.h>
|
|
#include <linux/ppp_channel.h>
|
|
#include <linux/skbuff.h>
|
|
+#include <linux/workqueue.h>
|
|
#include <uapi/linux/if_pppox.h>
|
|
|
|
static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
|
|
@@ -32,6 +33,7 @@ struct pppoe_opt {
|
|
struct pppoe_addr pa; /* what this socket is bound to*/
|
|
struct sockaddr_pppox relay; /* what socket data will be
|
|
relayed to (PPPoE relaying) */
|
|
+ struct work_struct padt_work;/* Work item for handling PADT */
|
|
};
|
|
|
|
struct pptp_opt {
|