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vxlan: simplify exception handling

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vxlan egress path error handling has became complicated, it
need to handle IPv4 and IPv6 tunnel cases.
Earlier patch removes vlan handling from vxlan_build_skb(), so
vxlan_build_skb does not need to free skb and we can simplify
the xmit path by having single error handling for both type of
tunnels.

Signed-off-by: Pravin B Shelar <pshelar@ovn.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
pravin shelar 2016-11-13 20:43:54 -08:00 committed by David S. Miller
parent 03dc52a86d
commit c46b7897ad
1 changed files with 21 additions and 29 deletions
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50
drivers/net/vxlan.c
View file

@ -1755,11 +1755,11 @@ static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto out_free;
return err;
err = iptunnel_handle_offloads(skb, type);
if (err)
goto out_free;
return err;
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
vxh->vx_flags = VXLAN_HF_VNI;
@ -1783,16 +1783,12 @@ static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
if (vxflags & VXLAN_F_GPE) {
err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
if (err < 0)
goto out_free;
return err;
inner_protocol = skb->protocol;
}
skb_set_inner_protocol(skb, inner_protocol);
return 0;
out_free:
kfree_skb(skb);
return err;
}
static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
@ -1929,13 +1925,13 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
struct ip_tunnel_info *info;
struct vxlan_dev *vxlan = netdev_priv(dev);
struct sock *sk;
struct rtable *rt = NULL;
const struct iphdr *old_iph;
union vxlan_addr *dst;
union vxlan_addr remote_ip, local_ip;
union vxlan_addr *src;
struct vxlan_metadata _md;
struct vxlan_metadata *md = &_md;
struct dst_entry *ndst = NULL;
__be16 src_port = 0, dst_port;
__be32 vni, label;
__be16 df = 0;
@ -2011,6 +2007,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
if (dst->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
struct rtable *rt;
if (!sock4)
goto drop;
@ -2032,7 +2029,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
netdev_dbg(dev, "circular route to %pI4\n",
&dst->sin.sin_addr.s_addr);
dev->stats.collisions++;
goto rt_tx_error;
ip_rt_put(rt);
goto tx_error;
}
/* Bypass encapsulation if the destination is local */
@ -2055,12 +2053,13 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
df = htons(IP_DF);
ndst = &rt->dst;
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
vni, md, flags, udp_sum);
if (err < 0)
goto xmit_tx_error;
goto tx_error;
udp_tunnel_xmit_skb(rt, sk, skb, src->sin.sin_addr.s_addr,
dst->sin.sin_addr.s_addr, tos, ttl, df,
@ -2068,7 +2067,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
struct dst_entry *ndst;
u32 rt6i_flags;
ndst = vxlan6_get_route(vxlan, sock6, skb,
@ -2080,13 +2078,13 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
netdev_dbg(dev, "no route to %pI6\n",
&dst->sin6.sin6_addr);
dev->stats.tx_carrier_errors++;
ndst = NULL;
goto tx_error;
}
if (ndst->dev == dev) {
netdev_dbg(dev, "circular route to %pI6\n",
&dst->sin6.sin6_addr);
dst_release(ndst);
dev->stats.collisions++;
goto tx_error;
}
@ -2098,12 +2096,12 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
!(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
struct vxlan_dev *dst_vxlan;
dst_release(ndst);
dst_vxlan = vxlan_find_vni(vxlan->net, vni,
dst->sa.sa_family, dst_port,
vxlan->flags);
if (!dst_vxlan)
goto tx_error;
dst_release(ndst);
vxlan_encap_bypass(skb, vxlan, dst_vxlan);
return;
}
@ -2116,11 +2114,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
skb_scrub_packet(skb, xnet);
err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
vni, md, flags, udp_sum);
if (err < 0) {
dst_release(ndst);
dev->stats.tx_errors++;
return;
}
if (err < 0)
goto tx_error;
udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
&src->sin6.sin6_addr,
&dst->sin6.sin6_addr, tos, ttl,
@ -2132,17 +2128,13 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
drop:
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:
dev->stats.tx_errors++;
tx_free:
dev_kfree_skb(skb);
return;
tx_error:
dst_release(ndst);
dev->stats.tx_errors++;
kfree_skb(skb);
}
/* Transmit local packets over Vxlan