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vxlan: consolidate output route calculation

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The code for output route lookup is duplicated for ndo_start_xmit and
ndo_fill_metadata_dst. Move it to a common function.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2016-02-02 18:09:14 +01:00 committed by David S. Miller
parent 828788ac99
commit 1a8496ba40
1 changed files with 37 additions and 40 deletions
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77
drivers/net/vxlan.c
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@ -1847,6 +1847,27 @@ static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *sk
return 0;
}
static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
struct sk_buff *skb, int oif, u8 tos,
__be32 daddr, __be32 *saddr)
{
struct rtable *rt = NULL;
struct flowi4 fl4;
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_oif = oif;
fl4.flowi4_tos = RT_TOS(tos);
fl4.flowi4_mark = skb->mark;
fl4.flowi4_proto = IPPROTO_UDP;
fl4.daddr = daddr;
fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
rt = ip_route_output_key(vxlan->net, &fl4);
if (!IS_ERR(rt))
*saddr = fl4.saddr;
return rt;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
struct sk_buff *skb, int oif,
@ -1928,7 +1949,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
struct sock *sk;
struct rtable *rt = NULL;
const struct iphdr *old_iph;
struct flowi4 fl4;
union vxlan_addr *dst;
union vxlan_addr remote_ip;
struct vxlan_metadata _md;
@ -1995,6 +2015,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
}
if (dst->sa.sa_family == AF_INET) {
__be32 saddr;
if (!vxlan->vn4_sock)
goto drop;
sk = vxlan->vn4_sock->sock->sk;
@ -2009,15 +2031,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
flags &= ~VXLAN_F_UDP_CSUM;
}
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
fl4.flowi4_tos = RT_TOS(tos);
fl4.flowi4_mark = skb->mark;
fl4.flowi4_proto = IPPROTO_UDP;
fl4.daddr = dst->sin.sin_addr.s_addr;
fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
rt = ip_route_output_key(vxlan->net, &fl4);
rt = vxlan_get_route(vxlan, skb,
rdst ? rdst->remote_ifindex : 0, tos,
dst->sin.sin_addr.s_addr, &saddr);
if (IS_ERR(rt)) {
netdev_dbg(dev, "no route to %pI4\n",
&dst->sin.sin_addr.s_addr);
@ -2049,7 +2065,7 @@ 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, fl4.saddr,
err = vxlan_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)),
@ -2390,31 +2406,6 @@ static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
struct ip_tunnel_info *info,
__be16 sport, __be16 dport)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct rtable *rt;
struct flowi4 fl4;
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_tos = RT_TOS(info->key.tos);
fl4.flowi4_mark = skb->mark;
fl4.flowi4_proto = IPPROTO_UDP;
fl4.daddr = info->key.u.ipv4.dst;
rt = ip_route_output_key(vxlan->net, &fl4);
if (IS_ERR(rt))
return PTR_ERR(rt);
ip_rt_put(rt);
info->key.u.ipv4.src = fl4.saddr;
info->key.tp_src = sport;
info->key.tp_dst = dport;
return 0;
}
static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
@ -2426,9 +2417,16 @@ static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
if (ip_tunnel_info_af(info) == AF_INET) {
struct rtable *rt;
if (!vxlan->vn4_sock)
return -EINVAL;
return egress_ipv4_tun_info(dev, skb, info, sport, dport);
rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
info->key.u.ipv4.dst,
&info->key.u.ipv4.src);
if (IS_ERR(rt))
return PTR_ERR(rt);
ip_rt_put(rt);
} else {
#if IS_ENABLED(CONFIG_IPV6)
struct dst_entry *ndst;
@ -2441,13 +2439,12 @@ static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
if (IS_ERR(ndst))
return PTR_ERR(ndst);
dst_release(ndst);
info->key.tp_src = sport;
info->key.tp_dst = dport;
#else /* !CONFIG_IPV6 */
return -EPFNOSUPPORT;
#endif
}
info->key.tp_src = sport;
info->key.tp_dst = dport;
return 0;
}