On Wed, May 27, 2015 at 10:40:32AM -0700, Alexander Duyck wrote: > This change makes it so that we use icmpv6_send to report PMTU issues back > into tunnels in the case that the resulting packet is larger than the MTU > of the outgoing interface. Previously xfrm_local_error was being used in > this case, however this was resulting in no changes, I suspect due to the > fact that the tunnel itself was being kept out of the loop. > > This patch fixes PMTU problems seen on ip6_vti tunnels and is based on the > behavior seen if the socket was orphaned. Instead of requiring the socket > to be orphaned this patch simply defaults to using icmpv6_send in the case > that the frame came though a tunnel. > > Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx> Does this still work with normal tunnel mode and identical inner and outer addresses? I recall we used to have a bug where in that situation the kernel would interpret the ICMP message as a reduction in outer MTU and thus resulting in a loop where the MTU keeps getting smaller. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
