This is a note to let you know that I've just added the patch titled
ip: report the original address of ICMP messages
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ip-report-the-original-address-of-icmp-messages.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Jul 3 20:00:25 PDT 2015
From: Julian Anastasov <ja@xxxxxx>
Date: Tue, 23 Jun 2015 08:34:39 +0300
Subject: ip: report the original address of ICMP messages
From: Julian Anastasov <ja@xxxxxx>
[ Upstream commit 34b99df4e6256ddafb663c6de0711dceceddfe0e ]
ICMP messages can trigger ICMP and local errors. In this case
serr->port is 0 and starting from Linux 4.0 we do not return
the original target address to the error queue readers.
Add function to define which errors provide addr_offset.
With this fix my ping command is not silent anymore.
Fixes: c247f0534cc5 ("ip: fix error queue empty skb handling")
Signed-off-by: Julian Anastasov <ja@xxxxxx>
Acked-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/ip_sockglue.c | 11 ++++++++++-
net/ipv6/datagram.c | 12 +++++++++++-
2 files changed, 21 insertions(+), 2 deletions(-)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -432,6 +432,15 @@ void ip_local_error(struct sock *sk, int
kfree_skb(skb);
}
+/* For some errors we have valid addr_offset even with zero payload and
+ * zero port. Also, addr_offset should be supported if port is set.
+ */
+static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
+{
+ return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
+}
+
/* IPv4 supports cmsg on all imcp errors and some timestamps
*
* Timestamp code paths do not initialize the fields expected by cmsg:
@@ -498,7 +507,7 @@ int ip_recv_error(struct sock *sk, struc
serr = SKB_EXT_ERR(skb);
- if (sin && serr->port) {
+ if (sin && ipv4_datagram_support_addr(serr)) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
serr->addr_offset);
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -325,6 +325,16 @@ void ipv6_local_rxpmtu(struct sock *sk,
kfree_skb(skb);
}
+/* For some errors we have valid addr_offset even with zero payload and
+ * zero port. Also, addr_offset should be supported if port is set.
+ */
+static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
+{
+ return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
+}
+
/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
*
* At one point, excluding local errors was a quick test to identify icmp/icmp6
@@ -389,7 +399,7 @@ int ipv6_recv_error(struct sock *sk, str
serr = SKB_EXT_ERR(skb);
- if (sin && serr->port) {
+ if (sin && ipv6_datagram_support_addr(serr)) {
const unsigned char *nh = skb_network_header(skb);
sin->sin6_family = AF_INET6;
sin->sin6_flowinfo = 0;
Patches currently in stable-queue which might be from ja@xxxxxx are
queue-4.1/neigh-do-not-modify-unlinked-entries.patch
queue-4.1/ip-report-the-original-address-of-icmp-messages.patch
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