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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2014-01-09 10:01:17 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-13 20:22:55 +0100 |
| commit | 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e (patch) | |
| tree | 4a8093c0dfa1507ce234754a54db8a95399955a4 /include/net/protocol.h | |
| parent | ipv6: introduce ip6_dst_mtu_forward and protect forwarding path with it (diff) | |
| download | linux-8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e.tar.xz linux-8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e.zip | |
ipv4: introduce hardened ip_no_pmtu_disc mode
This new ip_no_pmtu_disc mode only allowes fragmentation-needed errors
to be honored by protocols which do more stringent validation on the
ICMP's packet payload. This knob is useful for people who e.g. want to
run an unmodified DNS server in a namespace where they need to use pmtu
for TCP connections (as they are used for zone transfers or fallback
for requests) but don't want to use possibly spoofed UDP pmtu information.
Currently the whitelisted protocols are TCP, SCTP and DCCP as they check
if the returned packet is in the window or if the association is valid.
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: John Heffner <johnwheffner@gmail.com>
Suggested-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/protocol.h')
| -rw-r--r-- | include/net/protocol.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/net/protocol.h b/include/net/protocol.h index fbf7676c9a02..0e5f8665d7fb 100644 --- a/include/net/protocol.h +++ b/include/net/protocol.h @@ -43,7 +43,12 @@ struct net_protocol { int (*handler)(struct sk_buff *skb); void (*err_handler)(struct sk_buff *skb, u32 info); unsigned int no_policy:1, - netns_ok:1; + netns_ok:1, + /* does the protocol do more stringent + * icmp tag validation than simple + * socket lookup? + */ + icmp_strict_tag_validation:1; }; #if IS_ENABLED(CONFIG_IPV6) |