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vxlan: simplify metadata_dst usage in vxlan_rcv

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Now when the packet is scrubbed early, the metadata_dst can be assigned to
the skb as soon as it is allocated. This simplifies the error cleanup path,
as the dst will be freed by kfree_skb. It is also not necessary to pass it
as a parameter to functions anymore.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2016-02-23 18:02:59 +01:00 committed by David S. Miller
parent f2d1968ec8
commit 10a5af238c
1 changed files with 7 additions and 12 deletions
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19
drivers/net/vxlan.c
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@ -1165,16 +1165,17 @@ out:
static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
struct sk_buff *skb, u32 vxflags,
struct vxlan_metadata *md,
struct metadata_dst *tun_dst)
struct vxlan_metadata *md)
{
struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
struct metadata_dst *tun_dst;
if (!(unparsed->vx_flags & VXLAN_HF_GBP))
goto out;
md->gbp = ntohs(gbp->policy_id);
tun_dst = (struct metadata_dst *)skb_dst(skb);
if (tun_dst)
tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
@ -1250,7 +1251,6 @@ static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
/* Callback from net/ipv4/udp.c to receive packets */
static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
{
struct metadata_dst *tun_dst = NULL;
struct pcpu_sw_netstats *stats;
struct vxlan_dev *vxlan;
struct vxlan_sock *vs;
@ -1289,6 +1289,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
if (vxlan_collect_metadata(vs)) {
__be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
struct metadata_dst *tun_dst;
tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
vxlan_vni_to_tun_id(vni), sizeof(*md));
@ -1297,6 +1298,8 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
goto drop;
md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
skb_dst_set(skb, (struct dst_entry *)tun_dst);
} else {
memset(md, 0, sizeof(*md));
}
@ -1308,7 +1311,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
if (!vxlan_remcsum(&unparsed, skb, vs->flags))
goto drop;
if (vs->flags & VXLAN_F_GBP)
vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md, tun_dst);
vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
if (unparsed.vx_flags || unparsed.vx_vni) {
/* If there are any unprocessed flags remaining treat
@ -1325,11 +1328,6 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
if (!vxlan_set_mac(vxlan, vs, skb))
goto drop;
if (tun_dst) {
skb_dst_set(skb, (struct dst_entry *)tun_dst);
tun_dst = NULL;
}
oiph = skb_network_header(skb);
skb_reset_network_header(skb);
@ -1349,9 +1347,6 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
drop:
if (tun_dst)
dst_release((struct dst_entry *)tun_dst);
/* Consume bad packet */
kfree_skb(skb);
return 0;