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authorpravin shelar <pshelar@ovn.org>2016-11-13 20:43:54 -0800
committerDavid S. Miller <davem@davemloft.net>2016-11-15 12:16:13 -0500
commitc46b7897ad5ba49b215882fa6a1e4c28d21acf4f (patch)
tree5486f3fa2634a06fb8c3866ab8a247c9de499623 /drivers/net/vxlan.c
parent03dc52a86d58c70577d9f62527f68db9116f61a5 (diff)
vxlan: simplify exception handling
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>
Diffstat (limited to 'drivers/net/vxlan.c')
-rw-r--r--drivers/net/vxlan.c46
1 files changed, 19 insertions, 27 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 7730b33a3c3c..40ea9e06d8d1 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -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;
+ dev_kfree_skb(skb);
+ return;
-xmit_tx_error:
- /* skb is already freed. */
- skb = NULL;
-rt_tx_error:
- ip_rt_put(rt);
tx_error:
+ dst_release(ndst);
dev->stats.tx_errors++;
-tx_free:
- dev_kfree_skb(skb);
+ kfree_skb(skb);
}
/* Transmit local packets over Vxlan