#20380: firewall zone name length of 12 characters or more breaks all networking
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Reporter: tim@… | Owner: developers
Type: defect | Status: new
Priority: high | Milestone:
Component: base system | Version: Barrier Breaker 14.07
Resolution: | Keywords:
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Comment (by hnyman):
Replying to [comment:8 Damian Kaczkowski]:
> {{{
> config interface 'lan_protected'
> ...
> option type 'bridge'
> }}}
>
> {{{
> config zone
> option name 'lan_p'
> list network 'lan_protected'
> }}}
> fw3 reload
> {{{
> * Populating IPv4 filter table
> ...
> * Forward 'lan' -> 'wan'
> (null) v4: interface name `br-lan_protected' must be shorter than
IFNAMSIZ (15)
> }}}
Thanks for a clear example.
I tested yesterday with a normal non-bridged interface with a 14
characters long name and it worked ok. But your lan_protected is bridged
and that makes it then prefixed with "br-" making the name to be 16 chars
in total. Your error message hints that the limit is actually 15 chars.
interface name `br-lan_protected' must be shorter than IFNAMSIZ (15)
Your example clearly shows that name length needs to be limited to 15
characters.
IFNAMSIZ is defined as 16, and the name need to be shorter:
http://lxr.free-electrons.com/source/include/uapi/linux/if.h#L26
#define IFNAMSIZ 16
So 15 would be the maximum length at the first glance.
But there can be a possible prefix, like your "br-", but also "6in4-" etc.
root@OpenWrt:~# ifconfig
6in4-sixxs Link encap:IPv6-in-IPv4
That makes me wonder if the actual longest always working interface name
regardless of the possible type would be just 10 characters taking into
account the possibly 5 chars long prefix.
--
Ticket URL: <https://dev.openwrt.org/ticket/20380#comment:9>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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