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net: add a sysctl to reflect the fwmark on replies

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Kernel-originated IP packets that have no user socket associated
with them (e.g., ICMP errors and echo replies, TCP RSTs, etc.)
are emitted with a mark of zero. Add a sysctl to make them have
the same mark as the packet they are replying to.

This allows an administrator that wishes to do so to use
mark-based routing, firewalling, etc. for these replies by
marking the original packets inbound.

Tested using user-mode linux:
 - ICMP/ICMPv6 echo replies and errors.
 - TCP RST packets (IPv4 and IPv6).

Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Colitti
2014-05-13 10:17:33 -07:00
committed by David S. Miller
parent 87e067cda6
commit e110861f86
10 changed files with 41 additions and 3 deletions
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2
include/net/netns/ipv4.h
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@@ -77,6 +77,8 @@ struct netns_ipv4 {
int sysctl_ip_no_pmtu_disc;
int sysctl_ip_fwd_use_pmtu;
int sysctl_fwmark_reflect;
struct ping_group_range ping_group_range;
atomic_t dev_addr_genid;