On Tue, Aug 18, 2015 at 4:39 PM, Joe Stringer <joestrin...@nicira.com> wrote:
> Add support for using conntrack helpers to assist protocol detection.
> The new OVS_CT_ATTR_HELPER attribute of the ct action specifies a helper
> to be used for this connection.
>
> Example ODP flows allowing FTP connections from ports 1->2:
> in_port=1,tcp,action=ct(helper=ftp,commit),2
> in_port=2,tcp,ct_state=-trk,action=ct(),recirc(1)
> recirc_id=1,in_port=2,tcp,ct_state=+trk-new+est,action=1
> recirc_id=1,in_port=2,tcp,ct_state=+trk+rel,action=1
>
> Signed-off-by: Joe Stringer <joestrin...@nicira.com>
> ---
> v2-v3: No change.
> v4: Change error code for unknown helper ENOENT->EINVAL.
I got following compilation warning :
net/openvswitch/conntrack.c:352:42: error: incompatible types in
comparison expression (different address spaces)
> ---
> include/uapi/linux/openvswitch.h | 3 ++
> net/openvswitch/conntrack.c | 109
> ++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 110 insertions(+), 2 deletions(-)
>
...
> +static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char
> *name,
> + const struct sw_flow_key *key, bool log)
> +{
> + struct nf_conntrack_helper *helper;
> + struct nf_conn_help *help;
> +
> + helper = nf_conntrack_helper_try_module_get(name, info->family,
> + key->ip.proto);
> + if (!helper) {
> + OVS_NLERR(log, "Unknown helper \"%s\"", name);
> + return -EINVAL;
> + }
> +
> + help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
> + if (!help) {
> + module_put(helper->me);
> + return -ENOMEM;
> + }
> +
> + help->helper = helper;
helper is rcu pointer so need to use rcu API to set the value. I know
it is not required here, but it is still cleaner to use the API.
> + info->helper = helper;
> + return 0;
> +}
> +
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