dccp: Feature negotiation for minimum-checksum-coverage

This provides feature negotiation for server minimum checksum coverage
which so far has been missing.

Since sender/receiver coverage values range only from 0...15, their
type has also been reduced in size from u16 to u4.

Feature-negotiation options are now generated for both sender and receiver
coverage, i.e. when the peer has `forgotten' to enable partial coverage
then feature negotiation will automatically enable (negotiate) the partial
coverage value for this connection.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 6eaaca9b037a..5a5a89935dbc 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -527,8 +527,8 @@ struct dccp_sock {
         __u32                           dccps_timestamp_time;
         __u16                           dccps_l_ack_ratio;
         __u16                           dccps_r_ack_ratio;
-        __u16                           dccps_pcslen;
-        __u16                           dccps_pcrlen;
+        __u8                            dccps_pcslen:4;
+        __u8                            dccps_pcrlen:4;
         __u64                           dccps_ndp_count:48;
         unsigned long                   dccps_rate_last;
         struct dccp_minisock            dccps_minisock;