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| author | Eric Dumazet <edumazet@google.com> | 2014-04-10 21:23:36 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-14 12:39:59 -0400 |
| commit | 30f78d8ebf7f514801e71b88a10c948275168518 (patch) | |
| tree | f1e3fc6c694aa8a153901ceadf2106b2d43a0470 /include/net | |
| parent | 05ab8f2647e4221cbdb3856dd7d32bd5407316b3 (diff) | |
| download | linux-30f78d8ebf7f514801e71b88a10c948275168518.tar.gz linux-30f78d8ebf7f514801e71b88a10c948275168518.tar.bz2 linux-30f78d8ebf7f514801e71b88a10c948275168518.zip | |
ipv6: Limit mtu to 65575 bytes
Francois reported that setting big mtu on loopback device could prevent
tcp sessions making progress.
We do not support (yet ?) IPv6 Jumbograms and cook corrupted packets.
We must limit the IPv6 MTU to (65535 + 40) bytes in theory.
Tested:
ifconfig lo mtu 70000
netperf -H ::1
Before patch : Throughput : 0.05 Mbits
After patch : Throughput : 35484 Mbits
Reported-by: Francois WELLENREITER <f.wellenreiter@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/ip6_route.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 3c3bb184eb8f..6c4f5eac98e7 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -32,6 +32,11 @@ struct route_info { #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 +/* We do not (yet ?) support IPv6 jumbograms (RFC 2675) + * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header + */ +#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) + /* * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate * between IPV6_ADDR_PREFERENCES socket option values |