On Thu, 30 May 2019 16:43:20 +0000 Kevin 'ldir' Darbyshire-Bryant <l...@darbyshire-bryant.me.uk> wrote:
> ctinfo is an action restoring data stored in conntrack marks to various > fields. At present it has two independent modes of operation, > restoration of DSCP into IPv4/v6 diffserv and restoration of conntrack > marks into packet skb marks. > > It understands a number of parameters specific to this action in > additional to the usual action syntax. Each operating mode is > independent of the other so all options are err, optional, however not > specifying at least one mode is a bit pointless. > > Usage: ... ctinfo [dscp mask[/statemask]] [cpmark [mask]] [zone ZONE] > [CONTROL] [index <INDEX>]\n" > > DSCP mode > > dscp enables copying of a DSCP store in the conntrack mark into the > ipv4/v6 diffserv field. The mask is a 32bit field and specifies where > in the conntrack mark the DSCP value is stored. It must be 6 contiguous > bits long, e.g. 0xfc000000 would restore the DSCP from the upper 6 bits > of the conntrack mark. > > The DSCP copying may be optionally controlled by a statemask. The > statemask is a 32bit field, usually with a single bit set and must not > overlap the dscp mask. The DSCP restore operation will only take place > if the corresponding bit/s in conntrack mark yield a non zero result. > > eg. dscp 0xfc000000/0x01000000 would retrieve the DSCP from the top 6 > bits, whilst using bit 25 as a flag to do so. Bit 26 is unused in this > example. > > CPMARK mode > > cpmark enables copying of the conntrack mark to the packet skb mark. In > this mode it is completely equivalent to the existing act_connmark. > Additional functionality is provided by the optional mask parameter, > whereby the stored conntrack mark is logically anded with the cpmark > mask before being stored into skb mark. This allows shared usage of the > conntrack mark between applications. > > eg. cpmark 0x00ffffff would restore only the lower 24 bits of the > conntrack mark, thus may be useful in the event that the upper 8 bits > are used by the DSCP function. > > Usage: ... ctinfo [dscp mask[/statemask]] [cpmark [mask]] [zone ZONE] > [CONTROL] [index <INDEX>] > where : > dscp MASK is the bitmask to restore DSCP > STATEMASK is the bitmask to determine conditional restoring > cpmark MASK mask applied to restored packet mark > ZONE is the conntrack zone > CONTROL := reclassify | pipe | drop | continue | ok | goto chain > <CHAIN_INDEX> > > Signed-off-by: Kevin Darbyshire-Bryant <l...@darbyshire-bryant.me.uk> Your patch is mangled by your mail system, it has DOS line endings etc. Run checkpatch please.
