On 9/5/24 10:51 AM, Ido Schimmel wrote:
> tl;dr - This patchset finishes to unmask the upper DSCP bits in the IPv4
> flow key in preparation for allowing IPv4 FIB rules to match on DSCP. No
> functional changes are expected.
>
> The TOS field in the IPv4 flow key ('flowi4_tos') is used during FIB
> lookup to match against the TOS selector in FIB rules and routes.
>
> It is currently impossible for user space to configure FIB rules that
> match on the DSCP value as the upper DSCP bits are either masked in the
> various call sites that initialize the IPv4 flow key or along the path
> to the FIB core.
>
> In preparation for adding a DSCP selector to IPv4 and IPv6 FIB rules, we
> need to make sure the entire DSCP value is present in the IPv4 flow key.
> This patchset finishes to unmask the upper DSCP bits by adjusting all
> the callers of ip_route_output_key() to properly initialize the full
> DSCP value in the IPv4 flow key.
>
> No functional changes are expected as commit 1fa3314c14c6 ("ipv4:
> Centralize TOS matching") moved the masking of the upper DSCP bits to
> the core where 'flowi4_tos' is matched against the TOS selector.
>
> Ido Schimmel (12):
> netfilter: br_netfilter: Unmask upper DSCP bits in
> br_nf_pre_routing_finish()
> ipv4: ip_gre: Unmask upper DSCP bits in ipgre_open()
> bpf: lwtunnel: Unmask upper DSCP bits in bpf_lwt_xmit_reroute()
> ipv4: icmp: Unmask upper DSCP bits in icmp_reply()
> ipv4: ip_tunnel: Unmask upper DSCP bits in ip_tunnel_bind_dev()
> ipv4: ip_tunnel: Unmask upper DSCP bits in ip_md_tunnel_xmit()
> ipv4: ip_tunnel: Unmask upper DSCP bits in ip_tunnel_xmit()
> ipv4: netfilter: Unmask upper DSCP bits in ip_route_me_harder()
> netfilter: nft_flow_offload: Unmask upper DSCP bits in
> nft_flow_route()
> netfilter: nf_dup4: Unmask upper DSCP bits in nf_dup_ipv4_route()
> ipv4: udp_tunnel: Unmask upper DSCP bits in udp_tunnel_dst_lookup()
> sctp: Unmask upper DSCP bits in sctp_v4_get_dst()
>
> net/bridge/br_netfilter_hooks.c | 3 ++-
> net/core/lwt_bpf.c | 3 ++-
> net/ipv4/icmp.c | 2 +-
> net/ipv4/ip_gre.c | 3 ++-
> net/ipv4/ip_tunnel.c | 11 ++++++-----
> net/ipv4/netfilter.c | 3 ++-
> net/ipv4/netfilter/nf_dup_ipv4.c | 3 ++-
> net/ipv4/udp_tunnel_core.c | 3 ++-
> net/netfilter/nft_flow_offload.c | 3 ++-
> net/sctp/protocol.c | 3 ++-
> 10 files changed, 23 insertions(+), 14 deletions(-)
>
For the set:
Reviewed-by: David Ahern <[email protected]>
