From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47561 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756105AbbGDDF1 (ORCPT ); Fri, 3 Jul 2015 23:05:27 -0400 Subject: Patch "ip: report the original address of ICMP messages" has been added to the 4.1-stable tree To: ja@ssi.bg, davem@davemloft.net, gregkh@linuxfoundation.org, willemb@google.com Cc: , From: Date: Fri, 03 Jul 2015 20:05:18 -0700 Message-ID: <14359791182441@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 know about it. >>From foo@baz Fri Jul 3 20:00:25 PDT 2015 From: Julian Anastasov Date: Tue, 23 Jun 2015 08:34:39 +0300 Subject: ip: report the original address of ICMP messages From: Julian Anastasov [ 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 Acked-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- 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@ssi.bg are queue-4.1/neigh-do-not-modify-unlinked-entries.patch queue-4.1/ip-report-the-original-address-of-icmp-messages.patch