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Commit 10a5af23 authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller
Browse files

vxlan: simplify metadata_dst usage in vxlan_rcv 



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: default avatarJiri Benc <jbenc@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f2d1968e

drivers/net/vxlan.c

+7 −12
Original line number Diff line number Diff line
@@ -1165,16 +1165,17 @@ static bool vxlan_remcsum(struct vxlanhdr *unparsed, 


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;