• David Ahern's avatar
    net: Add l3mdev rule · 96c63fa7
    David Ahern authored
    Currently, VRFs require 1 oif and 1 iif rule per address family per
    VRF. As the number of VRF devices increases it brings scalability
    issues with the increasing rule list. All of the VRF rules have the
    same format with the exception of the specific table id to direct the
    lookup. Since the table id is available from the oif or iif in the
    loopup, the VRF rules can be consolidated to a single rule that pulls
    the table from the VRF device.
    
    This patch introduces a new rule attribute l3mdev. The l3mdev rule
    means the table id used for the lookup is pulled from the L3 master
    device (e.g., VRF) rather than being statically defined. With the
    l3mdev rule all of the basic VRF FIB rules are reduced to 1 l3mdev
    rule per address family (IPv4 and IPv6).
    
    If an admin wishes to insert higher priority rules for specific VRFs
    those rules will co-exist with the l3mdev rule. This capability means
    current VRF scripts will co-exist with this new simpler implementation.
    
    Currently, the rules list for both ipv4 and ipv6 look like this:
        $ ip  ru ls
        1000:       from all oif vrf1 lookup 1001
        1000:       from all iif vrf1 lookup 1001
        1000:       from all oif vrf2 lookup 1002
        1000:       from all iif vrf2 lookup 1002
        1000:       from all oif vrf3 lookup 1003
        1000:       from all iif vrf3 lookup 1003
        1000:       from all oif vrf4 lookup 1004
        1000:       from all iif vrf4 lookup 1004
        1000:       from all oif vrf5 lookup 1005
        1000:       from all iif vrf5 lookup 1005
        1000:       from all oif vrf6 lookup 1006
        1000:       from all iif vrf6 lookup 1006
        1000:       from all oif vrf7 lookup 1007
        1000:       from all iif vrf7 lookup 1007
        1000:       from all oif vrf8 lookup 1008
        1000:       from all iif vrf8 lookup 1008
        ...
        32765:      from all lookup local
        32766:      from all lookup main
        32767:      from all lookup default
    
    With the l3mdev rule the list is just the following regardless of the
    number of VRFs:
        $ ip ru ls
        1000:       from all lookup [l3mdev table]
        32765:      from all lookup local
        32766:      from all lookup main
        32767:      from all lookup default
    
    (Note: the above pretty print of the rule is based on an iproute2
           prototype. Actual verbage may change)
    Signed-off-by: 's avatarDavid Ahern <dsa@cumulusnetworks.com>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    96c63fa7
fib_rules.h 3.49 KB