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authorWillem de Bruijn <willemb@google.com>2016-11-02 11:02:17 -0400
committerDavid S. Miller <davem@davemloft.net>2016-11-03 15:41:11 -0400
commit0cc0aa614b4c24b21b2492c0a1753035ee8c6edb (patch)
tree848076fe75ed2503f9ef9b479cefb2317ea18682 /include/linux
parent70ecc24841326396a827deb55c3fefac582a729d (diff)
ipv6: add IPV6_RECVFRAGSIZE cmsg
When reading a datagram or raw packet that arrived fragmented, expose the maximum fragment size if recorded to allow applications to estimate receive path MTU. At this point, the field is only recorded when ipv6 connection tracking is enabled. A follow-up patch will record this field also in the ipv6 input path. Tested using the test for IP_RECVFRAGSIZE plus ip netns exec to ip addr add dev veth1 fc07::1/64 ip netns exec from ip addr add dev veth0 fc07::2/64 ip netns exec to ./recv_cmsg_recvfragsize -6 -u -p 6000 & ip netns exec from nc -q 1 -u fc07::1 6000 < payload Both with and without enabling connection tracking ip6tables -A INPUT -m state --state NEW -p udp -j LOG Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/ipv6.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index ca1ad9ebbc92..1afb6e8d35c3 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -229,8 +229,9 @@ struct ipv6_pinfo {
rxflow:1,
rxtclass:1,
rxpmtu:1,
- rxorigdstaddr:1;
- /* 2 bits hole */
+ rxorigdstaddr:1,
+ recvfragsize:1;
+ /* 1 bits hole */
} bits;
__u16 all;
} rxopt;