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openvswitch: Refactor labels initialization. 

Refactoring conntrack labels initialization makes changes in later
patches easier to review.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarno Rajahalme 2017-02-09 11:21:57 -08:00 committed by David S. Miller
parent b87cec3814
commit 6ffcea7995
1 changed files with 62 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
net/openvswitch/conntrack.c
View File

@ -227,19 +227,12 @@ int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
return 0;
}
static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
u32 ct_mark, u32 mask)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
u32 new_mark;
/* The connection could be invalid, in which case set_mark is no-op. */
ct = nf_ct_get(skb, &ctinfo);
if (!ct)
return 0;
new_mark = ct_mark | (ct->mark & ~(mask));
if (ct->mark != new_mark) {
ct->mark = new_mark;
@ -254,50 +247,66 @@ static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
#endif
}
static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_ct_labels *labels,
const struct ovs_key_ct_labels *mask)
static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
{
enum ip_conntrack_info ctinfo;
struct nf_conn_labels *cl;
struct nf_conn *ct;
/* The connection could be invalid, in which case set_label is no-op.*/
ct = nf_ct_get(skb, &ctinfo);
if (!ct)
return 0;
cl = nf_ct_labels_find(ct);
if (!cl) {
nf_ct_labels_ext_add(ct);
cl = nf_ct_labels_find(ct);
}
return cl;
}
/* Initialize labels for a new, yet to be committed conntrack entry. Note that
* since the new connection is not yet confirmed, and thus no-one else has
* access to it's labels, we simply write them over. Also, we refrain from
* triggering events, as receiving change events before the create event would
* be confusing.
*/
static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
const struct ovs_key_ct_labels *labels,
const struct ovs_key_ct_labels *mask)
{
struct nf_conn_labels *cl;
u32 *dst;
int i;
cl = ovs_ct_get_conn_labels(ct);
if (!cl)
return -ENOSPC;
if (nf_ct_is_confirmed(ct)) {
/* Triggers a change event, which makes sense only for
* confirmed connections.
*/
int err = nf_connlabels_replace(ct, labels->ct_labels_32,
mask->ct_labels_32,
OVS_CT_LABELS_LEN_32);
if (err)
return err;
} else {
u32 *dst = (u32 *)cl->bits;
const u32 *msk = mask->ct_labels_32;
const u32 *lbl = labels->ct_labels_32;
int i;
dst = (u32 *)cl->bits;
for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
(labels->ct_labels_32[i] & mask->ct_labels_32[i]);
/* No-one else has access to the non-confirmed entry, copy
* labels over, keeping any bits we are not explicitly setting.
*/
for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
dst[i] = (dst[i] & ~msk[i]) | (lbl[i] & msk[i]);
}
memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
return 0;
}
static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
const struct ovs_key_ct_labels *labels,
const struct ovs_key_ct_labels *mask)
{
struct nf_conn_labels *cl;
int err;
cl = ovs_ct_get_conn_labels(ct);
if (!cl)
return -ENOSPC;
err = nf_connlabels_replace(ct, labels->ct_labels_32,
mask->ct_labels_32,
OVS_CT_LABELS_LEN_32);
if (err)
return err;
memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
ovs_ct_get_labels(ct, &key->ct.labels);
return 0;
}
@ -877,25 +886,36 @@ static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
const struct ovs_conntrack_info *info,
struct sk_buff *skb)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
int err;
err = __ovs_ct_lookup(net, key, info, skb);
if (err)
return err;
/* The connection could be invalid, in which case this is a no-op.*/
ct = nf_ct_get(skb, &ctinfo);
if (!ct)
return 0;
/* Apply changes before confirming the connection so that the initial
* conntrack NEW netlink event carries the values given in the CT
* action.
*/
if (info->mark.mask) {
err = ovs_ct_set_mark(skb, key, info->mark.value,
err = ovs_ct_set_mark(ct, key, info->mark.value,
info->mark.mask);
if (err)
return err;
}
if (labels_nonzero(&info->labels.mask)) {
err = ovs_ct_set_labels(skb, key, &info->labels.value,
&info->labels.mask);
if (!nf_ct_is_confirmed(ct))
err = ovs_ct_init_labels(ct, key, &info->labels.value,
&info->labels.mask);
else
err = ovs_ct_set_labels(ct, key, &info->labels.value,
&info->labels.mask);
if (err)
return err;
}