Here is a list of all documented files with brief descriptions:

conntrack/api.c
expect/api.c
conntrack/build.c
expect/build.c
conntrack/build_mnl.c
expect/build_mnl.c
callback.c
cmp-exp.c
conntrack/compare.c
expect/compare.c
conntrack_create.c
conntrack_create_nat.c
conntrack_delete.c
conntrack_dump.c
conntrack_dump_filter.c
conntrack_events.c
conntrack_filter.c
conntrack_flush.c
conntrack_get.c
conntrack_grp_create.c
conntrack_master.c
conntrack_update.c
copy.c
ct_echo_event.c
ct_events_reliable.c
ct_mark_filter.c
ct_stress.c
ctexp_events.c
expect_create.c
expect_create_nat.c
expect_create_userspace.c
expect_delete.c
expect_dump.c
expect_events.c
expect_flush.c
expect_get.c
filter.c
filter_dump.c
conntrack/getter.c
expect/getter.c
grp.c
grp_getter.c
grp_setter.c
labels.c
libnetfilter_conntrack.h
libnetfilter_conntrack_dccp.h
libnetfilter_conntrack_icmp.h
libnetfilter_conntrack_ipv4.h
libnetfilter_conntrack_ipv6.h
libnetfilter_conntrack_sctp.h
libnetfilter_conntrack_tcp.h
libnetfilter_conntrack_udp.h
main.c
nfct-mnl-create.c
nfct-mnl-del.c
nfct-mnl-dump-labels.c
nfct-mnl-dump.c
nfct-mnl-event.c
nfct-mnl-flush.c
nfct-mnl-get.c
nfct-mnl-set-label.c
nfct-mnl-stats-cpu.c
nfexp-mnl-dump-ct.c
nfexp-mnl-dump.c
nfexp-mnl-event.c
nssocket.c
objopt.c
conntrack/parse.c
expect/parse.c
conntrack/parse_mnl.c
expect/parse_mnl.c
conntrack/setter.c
expect/setter.c
conntrack/snprintf.c
expect/snprintf.c
conntrack/snprintf_default.c
expect/snprintf_default.c
conntrack/snprintf_xml.c
expect/snprintf_xml.c
test_api.c
test_connlabel.c
test_filter.c