Defined in 2 files as a macro:

• include/uapi/linux/tcp.h, line 110 (as a macro)
• tools/include/uapi/linux/tcp.h, line 107 (as a macro)

Referenced in 2 files:

• net/ipv4/tcp.c
  • line 3978
  • line 4625
• net/mptcp/sockopt.c, line 554