conntrack: add support for stats dumping via ctnetlink

Since Linux kernel >= 3.6.x, we can dump the conntrack statistics
via ctnetlink instead of using the /proc interface:

 conntrack -S

cpu=0           searched=9177 found=387086 new=250451 invalid=1 ignore=4 delete=254093 delete_list=5467 insert=1825 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=1           searched=390 found=37493 new=1531 invalid=0 ignore=0 delete=345 delete_list=345 insert=1531 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=2           searched=333 found=68061 new=1895 invalid=0 ignore=1 delete=607 delete_list=607 insert=1896 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=3           searched=71 found=13364 new=1254 invalid=0 ignore=0 delete=75 delete_list=75 insert=1254 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0

 conntrack -S exp

cpu=0           expect_new=9177 expect_create=387284 expect_delete=251141
cpu=1           expect_new=390 expect_create=37496 expect_delete=1531
cpu=2           expect_new=333 expect_create=68117 expect_delete=1895
cpu=3           expect_new=71 expect_create=13366 expect_delete=1255

Note that the output is not backward-compatible, but we fail back to previous
output in case that ctnetlink stats dumping is not available.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions