From: Xin Long <[email protected]> Date: Sat, 11 Nov 2017 19:06:48 +0800
> Now let's say there are 3 kinds of icmp packets to process for tunnels, > toobig(needfrag), redirect, others, their process should be: > > - toobig(needfrag) > update the lower dst's pmtu by route cache, also update sk dst's pmtu > if possible, or it will be fine if sk dst pmtu will get updated on tx > path. > > - redirect > update the lower dst's gw by route cache and return, no need to send > this redirect packet to user sk. > > - others > send the packet to user's sk, or it will also be fine to use err_count > to count it and report fail link on tx path. > > All ipv4 tunnels basically follow this while some of ipv6 tunnels are > doing in different ways, like ip6gre and ip6_tunnels update tnl dev's > mtu instead of updating lower dst pmtu, no redirect process on their > err_handlers, which doesn't make any sense and even causes performance > problems. > > This patchset is to improve the process of redirect and toobig for ip6gre > ip4ip6, ip6ip6 tunnels, as in ipv4 tunnels. Series applied, thank you.
