When netfilter needs to match traffic made by one of the above protocols,
layer-4 connection tracking functionality will not be available, unless the
user explicly loads it in the kernel (e.g. "modprobe nf_conntrack_proto_sctp")
or modifies the default kernel configuration and rebuilds.
In order to remove such limitation, this series converts
CONFIG_NF_CT_PROTO_{DCCP,SCTP,UDPLITE} from tristate to boolean: in case
conntrack support for these protocols is enabled in the kernel configuration,
it will be built into nf_conntrack.ko.
Patch 1/4 fixes nf_conntrack_tuple_common.h to avoid compile-time errors
when moving module per-net private data.
Patches 2/4 3,4 and 4/4 remove loadable kernel module support from DCCP,
SCTP and UDPlite respectively.
footprint test (nf-next.git, x86_64, RHEL7)
Patches 2/4 to 4/4 in this series have been individually tested on a
nf-next.git kernel with standard RHEL7 configuration on x86_64 architecture,
recording the unstripped binary size after module clean/rebuild:
$ ls -l net/netfilter/nf_conntrack{,_proto_{dccp,sctp,udplite}}.ko \
net/ipv4/netfilter/nf_conntrack_ipv4.ko \
net/ipv6/netfilter/nf_conntrack_ipv6.ko
(builtin)|| dccp | sctp | udplite | ipv4 | ipv6 | nf_conntrack
---------++--------+--------+-----------+--------+--------+--------------
none || 469140 | 498243 | 432538 | 828755 | 828676 | 6141434
DCCP || - | 498987 | 432746 | 830566 | 829935 | 6533526
SCTP || 469276 | - | 432690 | 829254 | 829175 | 6547872
UDPlite || 469484 | 498587 | - | 829649 | 829362 | 6498204
all || - | - | - | 831999 | 831104 | 7298358
Davide Caratti (4):
netfilter: nf_conntrack_tuple_common.h: fix #include
netfilter: conntrack: built-in support for DCCP
netfilter: conntrack: built-in support for SCTP
netfilter: conntrack: built-in support for UDPlite
include/linux/netfilter/nf_conntrack_dccp.h | 2 +-
include/net/netfilter/ipv4/nf_conntrack_ipv4.h | 9 +++
include/net/netfilter/ipv6/nf_conntrack_ipv6.h | 9 +++
include/net/netns/conntrack.h | 43 ++++++++++++
.../linux/netfilter/nf_conntrack_tuple_common.h | 2 +-
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 9 +++
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c | 9 +++
net/netfilter/Kconfig | 18 ++---
net/netfilter/Makefile | 7 +-
net/netfilter/nf_conntrack_proto_dccp.c | 79 +++-------------------
net/netfilter/nf_conntrack_proto_sctp.c | 76 +++------------------
net/netfilter/nf_conntrack_proto_udplite.c | 79 +++-------------------
12 files changed, 121 insertions(+), 221 deletions(-)
--
2.7.4
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