• Jiri Benc's avatar
    net: implement IP_RECVTOS for IP_PKTOPTIONS · 4c507d28
    Jiri Benc authored
    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: default avatarJiri Benc <jbenc@redhat.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
inet_sock.h 6.2 KB