Defined in 2 files as a macro:

• include/net/tcp.h, line 427 (as a macro)
• tools/testing/selftests/bpf/progs/bpf_tracing_net.h, line 64 (as a macro)

Referenced in 2 files:

• include/net/tcp_ecn.h
  • line 45
  • line 67
• net/ipv4/tcp_output.c
  • line 363
  • line 364