Jiri Benc 4c507d2897
net: implement IP_RECVTOS for IP_PKTOPTIONS ...
Currently, it is not easily possible to get TOS/DSCP value of packets from
an incoming TCP stream. The mechanism is there, IP_PKTOPTIONS getsockopt
with IP_RECVTOS set, the same way as incoming TTL can be queried. This is
not actually implemented for TOS, though.
This patch adds this functionality, both for IPv4 (IP_PKTOPTIONS) and IPv6
(IPV6_2292PKTOPTIONS). For IPv4, like in the IP_RECVTTL case, the value of
the TOS field is stored from the other party's ACK.
This is needed for proxies which require DSCP transparency. One such example
is at http://zph.bratcheda.org/ .
Signed-off-by: Jiri Benc <jbenc@redhat.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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4c507d2897