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authorLorenzo Colitti <lorenzo@google.com>2014-05-13 10:17:33 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-13 18:35:08 -0400
commite110861f86094cd78cc85593b873970092deb43a (patch)
tree535ecba8f65cefb68da0846ff54801bb32bf3c9e /include/net/ipv6.h
parent87e067cda6df60b55cea0239c2f3cee81e9f46df (diff)
net: add a sysctl to reflect the fwmark on replies
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>
Diffstat (limited to 'include/net/ipv6.h')
-rw-r--r--include/net/ipv6.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 5b40ad297b8c..ba810d0546bc 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -113,6 +113,9 @@ struct frag_hdr {
#define IP6_MF 0x0001
#define IP6_OFFSET 0xFFF8
+#define IP6_REPLY_MARK(net, mark) \
+ ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
+
#include <net/sock.h>
/* sysctls */