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Default device net config enables ip forwarding

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The Linux kernel is inconsistent about how devconf is configured for new
network namespaces between ipv4 and ipv6. The behavior can also be
controlled via net.core.devconf_inherit_init_net in Linux 5.1+ so make
sure to enable forwarding on all and default for both ipv6 and ipv4.

This issue first came up testing on a yocto kernel that had this patch:
 ipv4: net namespace does not inherit network configurations

[0] https://www.kernel.org/doc/html/latest/admin-guide/sysctl/net.html#devconf-inherit-init-net
[1] https://lkml.org/lkml/2014/7/29/119

Signed-off-by: Brennan Ashton <brennana@jfrog.com>
This commit is contained in:
Brennan Ashton 2019-12-10 16:13:19 -08:00
parent 2cf88ae2c4
commit a952d5c32a
1 changed files with 6 additions and 1 deletions
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7
pkg/agent/syssetup/setup.go
View File

@ -30,8 +30,13 @@ func Configure() {
loadKernelModule("nf_conntrack")
loadKernelModule("br_netfilter")
enableSystemControl("/proc/sys/net/ipv4/ip_forward")
// Kernel is inconsistent about how devconf is configured for
// new network namespaces between ipv4 and ipv6. Make sure to
// enable forwarding on all and default for both ipv4 and ipv8.
enableSystemControl("/proc/sys/net/ipv4/conf/all/forwarding")
enableSystemControl("/proc/sys/net/ipv4/conf/default/forwarding")
enableSystemControl("/proc/sys/net/ipv6/conf/all/forwarding")
enableSystemControl("/proc/sys/net/ipv6/conf/default/forwarding")
enableSystemControl("/proc/sys/net/bridge/bridge-nf-call-iptables")
enableSystemControl("/proc/sys/net/bridge/bridge-nf-call-ip6tables")
}