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openvswitch: Drop user features if old user space attempted to create datapath

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Drop user features if an outdated user space instance that does not
understand the concept of user_features attempted to create a new
datapath.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Thomas Graf 2013-12-13 15:22:19 +01:00 committed by Jesse Gross
parent 43d4be9cb5
commit 44da5ae5fb
2 changed files with 30 additions and 1 deletions
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10
include/uapi/linux/openvswitch.h
View file

@ -40,7 +40,15 @@ struct ovs_header {
#define OVS_DATAPATH_FAMILY "ovs_datapath"
#define OVS_DATAPATH_MCGROUP "ovs_datapath"
#define OVS_DATAPATH_VERSION 0x1
/* V2:
* - API users are expected to provide OVS_DP_ATTR_USER_FEATURES
* when creating the datapath.
*/
#define OVS_DATAPATH_VERSION 2
/* First OVS datapath version to support features */
#define OVS_DP_VER_FEATURES 2
enum ovs_datapath_cmd {
OVS_DP_CMD_UNSPEC,

21
net/openvswitch/datapath.c
View file

@ -1148,6 +1148,18 @@ static struct datapath *lookup_datapath(struct net *net,
return dp ? dp : ERR_PTR(-ENODEV);
}
static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
{
struct datapath *dp;
dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
if (!dp)
return;
WARN(dp->user_features, "Dropping previously announced user features\n");
dp->user_features = 0;
}
static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
{
if (a[OVS_DP_ATTR_USER_FEATURES])
@ -1220,6 +1232,15 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
if (err == -EBUSY)
err = -EEXIST;
if (err == -EEXIST) {
/* An outdated user space instance that does not understand
* the concept of user_features has attempted to create a new
* datapath and is likely to reuse it. Drop all user features.
*/
if (info->genlhdr->version < OVS_DP_VER_FEATURES)
ovs_dp_reset_user_features(skb, info);
}
goto err_destroy_ports_array;
}