diff options
| 2016-05-20 13:21:10 -0300 | ||
| committer | David S. Miller <davem@davemloft.net> | 2016-05-23 14:32:06 -0700 |
|---|---|---|
| commit | 049bbf589ec651685205bd8ce73221fdd62345cf (patch) | |
| tree | 7ffa03d58de9feb7251a6284067247b45e4580b5 | |
| parent | 2ece068e1b1d6e76ecd07e04b027013e931287ff (diff) | |
ipv4: Fix non-initialized TTL when CONFIG_SYSCTL=n
Commit fa50d974d104 ("ipv4: Namespaceify ip_default_ttl sysctl knob")
moves the default TTL assignment, and as side-effect IPv4 TTL now
has a default value only if sysctl support is enabled (CONFIG_SYSCTL=y).
The sysctl_ip_default_ttl is fundamental for IP to work properly,
as it provides the TTL to be used as default. The defautl TTL may be
used in ip_selected_ttl, through the following flow:
ip_select_ttl
ip4_dst_hoplimit
net->ipv4.sysctl_ip_default_ttl
This commit fixes the issue by assigning net->ipv4.sysctl_ip_default_ttl
in net_init_net, called during ipv4's initialization.
Without this commit, a kernel built without sysctl support will send
all IP packets with zero TTL (unless a TTL is explicitly set, e.g.
with setsockopt).
Given a similar issue might appear on the other knobs that were
namespaceify, this commit also moves them.
Fixes: fa50d974d104 ("ipv4: Namespaceify ip_default_ttl sysctl knob")
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: David S. Miller <davem@davemloft.net>