Use most recently specified symbols of RFC-to-be-6013.

Permit setting either cookie or s_data or both (sequentially).

Allows different s_data limits for SYN and SYN_ACK.

Split the data value from socket option header, saving more than
1K of stack space in the handler by copying long data values
directly from user space into the kref block.

Signed-off-by: William.Allen.Simpson@gmail.com
---
  include/linux/tcp.h |   35 ++++++++++++++++-----
  net/ipv4/tcp.c      |   86 ++++++++++++++++++++++++++++++++++++--------------
  2 files changed, 89 insertions(+), 32 deletions(-)