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authorEzequiel Garcia <ezequiel@vanguardiasur.com.ar>2016-05-20 13:21:10 -0300
committerDavid S. Miller <davem@davemloft.net>2016-05-23 14:32:06 -0700
commit049bbf589ec651685205bd8ce73221fdd62345cf (patch)
tree7ffa03d58de9feb7251a6284067247b45e4580b5 /MAINTAINERS
parent2ece068e1b1d6e76ecd07e04b027013e931287ff (diff)
downloadlinux-049bbf589ec651685205bd8ce73221fdd62345cf.tar.bz2
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>
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