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Commit f491e56d authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller
Browse files

vxlan: consolidate vxlan_xmit_skb and vxlan6_xmit_skb 



There's a lot of code duplication. Factor out the duplicate code to a new
function shared between IPv4 and IPv6 xmit path.

Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b4ed5cad

drivers/net/vxlan.c

+26 −111
Original line number Diff line number Diff line
@@ -1684,19 +1684,14 @@ static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags, 
	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);

}



#if IS_ENABLED(CONFIG_IPV6)

static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,

			   struct sk_buff *skb,

			   struct net_device *dev, struct in6_addr *saddr,

			   struct in6_addr *daddr, __u8 prio, __u8 ttl,

			   __be16 src_port, __be16 dst_port, __be32 vni,

			   struct vxlan_metadata *md, bool xnet, u32 vxflags,

static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,

			   int iphdr_len, __be32 vni,

			   struct vxlan_metadata *md, u32 vxflags,

			   bool udp_sum)

{

	struct vxlanhdr *vxh;

	int min_headroom;

	int err;

	bool nocheck = !udp_sum;

	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	u16 hdrlen = sizeof(struct vxlanhdr);
@@ -1713,93 +1708,8 @@ static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk, 
		}

	}



	skb_scrub_packet(skb, xnet);



	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len

			+ VXLAN_HLEN + sizeof(struct ipv6hdr)

			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);



	/* Need space for new headers (invalidates iph ptr) */

	err = skb_cow_head(skb, min_headroom);

	if (unlikely(err)) {

		kfree_skb(skb);

		goto err;

	}



	skb = vlan_hwaccel_push_inside(skb);

	if (WARN_ON(!skb)) {

		err = -ENOMEM;

		goto err;

	}



	skb = iptunnel_handle_offloads(skb, udp_sum, type);

	if (IS_ERR(skb)) {

		err = -EINVAL;

		goto err;

	}



	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));

	vxh->vx_flags = htonl(VXLAN_HF_VNI);

	vxh->vx_vni = vni;



	if (type & SKB_GSO_TUNNEL_REMCSUM) {

		u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>

			   VXLAN_RCO_SHIFT;



		if (skb->csum_offset == offsetof(struct udphdr, check))

			data |= VXLAN_RCO_UDP;



		vxh->vx_vni |= htonl(data);

		vxh->vx_flags |= htonl(VXLAN_HF_RCO);



		if (!skb_is_gso(skb)) {

			skb->ip_summed = CHECKSUM_NONE;

			skb->encapsulation = 0;

		}

	}



	if (vxflags & VXLAN_F_GBP)

		vxlan_build_gbp_hdr(vxh, vxflags, md);



	skb_set_inner_protocol(skb, htons(ETH_P_TEB));



	udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,

			     ttl, src_port, dst_port, nocheck);

	return 0;

err:

	dst_release(dst);

	return err;

}

#endif



static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,

			  __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,

			  __be16 src_port, __be16 dst_port, __be32 vni,

			  struct vxlan_metadata *md, bool xnet, u32 vxflags,

			  bool udp_sum)

{

	struct vxlanhdr *vxh;

	int min_headroom;

	int err;

	bool nocheck = !udp_sum;

	int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	u16 hdrlen = sizeof(struct vxlanhdr);



	if ((vxflags & VXLAN_F_REMCSUM_TX) &&

	    skb->ip_summed == CHECKSUM_PARTIAL) {

		int csum_start = skb_checksum_start_offset(skb);



		if (csum_start <= VXLAN_MAX_REMCSUM_START &&

		    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&

		    (skb->csum_offset == offsetof(struct udphdr, check) ||

		     skb->csum_offset == offsetof(struct tcphdr, check))) {

			udp_sum = false;

			type |= SKB_GSO_TUNNEL_REMCSUM;

		}

	}



	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len

			+ VXLAN_HLEN + sizeof(struct iphdr)

			+ VXLAN_HLEN + iphdr_len

			+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);



	/* Need space for new headers (invalidates iph ptr) */
@@ -1841,9 +1751,6 @@ static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *sk 
		vxlan_build_gbp_hdr(vxh, vxflags, md);



	skb_set_inner_protocol(skb, htons(ETH_P_TEB));



	udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,

			    src_port, dst_port, xnet, nocheck);

	return 0;

}
@@ -1960,6 +1867,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
	int err;

	u32 flags = vxlan->flags;

	bool udp_sum = false;

	bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));



	info = skb_tunnel_info(skb);
@@ -2064,16 +1972,14 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 


		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);

		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);

		err = vxlan_xmit_skb(rt, sk, skb, saddr,

		err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),

				      htonl(vni << 8), md, flags, udp_sum);

		if (err < 0)

			goto xmit_tx_error;



		udp_tunnel_xmit_skb(rt, sk, skb, saddr,

				    dst->sin.sin_addr.s_addr, tos, ttl, df,

				     src_port, dst_port, htonl(vni << 8), md,

				     !net_eq(vxlan->net, dev_net(vxlan->dev)),

				     flags, udp_sum);

		if (err < 0) {

			/* skb is already freed. */

			skb = NULL;

			goto rt_tx_error;

		}

				    src_port, dst_port, xnet, !udp_sum);

#if IS_ENABLED(CONFIG_IPV6)

	} else {

		struct dst_entry *ndst;
@@ -2122,10 +2028,16 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
			udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);



		ttl = ttl ? : ip6_dst_hoplimit(ndst);

		err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,

				      0, ttl, src_port, dst_port, htonl(vni << 8), md,

				      !net_eq(vxlan->net, dev_net(vxlan->dev)),

				      flags, udp_sum);

		skb_scrub_packet(skb, xnet);

		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),

				      htonl(vni << 8), md, flags, udp_sum);

		if (err < 0) {

			dst_release(ndst);

			return;

		}

		udp_tunnel6_xmit_skb(ndst, sk, skb, dev,

				     &saddr, &dst->sin6.sin6_addr,

				     0, ttl, src_port, dst_port, !udp_sum);

#endif

	}
@@ -2135,6 +2047,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
	dev->stats.tx_dropped++;

	goto tx_free;



xmit_tx_error:

	/* skb is already freed. */

	skb = NULL;

rt_tx_error:

	ip_rt_put(rt);

tx_error: