[PATCH 0/5]: Sync/Reset Floods; Rate-Limiting for DCCP-Sync

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This patch set fixes two bugs and adds rate-limiting for DCCP-Syncs.

Patch #1: Uses variables instead of a reference to skb fields;
          it is needed by patch #2 (no code change here).

Patch #2: Fixes the Sync/Reset flood bug discussed earlier on
          dccp@vger, by adding the special case for sequence-invalid
          Reset from RFC 4340, 7.5.4.

Patch #3: Renames `seq' parameter of dccp_send_sync into `ackno'.

Patch #4: Implements rate-limiting for DCCP-Syncs.

Patch #5: Adds another exception required by RFC 4340, 7.5.4 -
          In state REQUEST, receiving a Sync generates a Reset and
          not a SyncAck.
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