Defined in 2 files as a macro:

• include/uapi/linux/tcp.h, line 167 (as a macro)
• tools/include/uapi/linux/tcp.h, line 167 (as a macro)

Referenced in 2 files:

• net/dccp/ccids/ccid3.c, line 811
• net/ipv4/tcp.c, line 3727