Overview of kernel network code (1)

sys/i386/: intel 80x86 specific
isa/if_XX.c:ISA device drivers (FreeBSD)
sys/sys/: kernel headers
ioctl.h, mbuf.h, ...
sys/kern/:general kernel
uipc_mbuf[2].c: mbuf manipulation
uipc_socket[2].c: socket operation
uipc_syscall.c:system call operation
sys/net/: generic networking
if_ethersubr.c: subroutines for ethernet layer operation
route.c: kernel routing table manipulation
rtsock.c: routing socket operation