net: vrf: ipv6 support for local traffic to local addresses

Add support for locally originated traffic to VRF-local IPv6 addresses.
Similar to IPv4 a local dst is set on the skb and the packet is
reinserted with a call to netif_rx. With this patch, ping, tcp and udp
packets to a local IPv6 address are successfully routed:

    $ ip addr show dev eth1
    4: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master red state UP group default qlen 1000
        link/ether 02:e0:f9:1c:b9:74 brd ff:ff:ff:ff:ff:ff
        inet 10.100.1.1/24 brd 10.100.1.255 scope global eth1
           valid_lft forever preferred_lft forever
        inet6 2100:1::1/120 scope global
           valid_lft forever preferred_lft forever
        inet6 fe80::e0:f9ff:fe1c:b974/64 scope link
           valid_lft forever preferred_lft forever

    $ ping6 -c1 -I red 2100:1::1
    ping6: Warning: source address might be selected on device other than red.
    PING 2100:1::1(2100:1::1) from 2100:1::1 red: 56 data bytes
    64 bytes from 2100:1::1: icmp_seq=1 ttl=64 time=0.098 ms

ip6_input is exported so the VRF driver can use it for the dst input
function. The dst_alloc function for IPv4 defaults to setting the input and
output functions; IPv6's does not. VRF does not need to duplicate the Rx path
so just export the ipv6 input function.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 203d3c78a6e591b9bcfe4aa783dda655bb4471b1..1b214ea4619a5838d6478a2835f8e73da85bef78 100644 (file)
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -46,6 +46,7 @@ struct net_vrf {
        struct rtable __rcu     *rth;
        struct rtable __rcu     *rth_local;
        struct rt6_info __rcu   *rt6;
+       struct rt6_info __rcu   *rt6_local;
        u32                     tb_id;
 };
 
@@ -157,6 +158,46 @@ static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
                goto err;
 
        skb_dst_drop(skb);
+
+       /* if dst.dev is loopback or the VRF device again this is locally
+        * originated traffic destined to a local address. Short circuit
+        * to Rx path using our local dst
+        */
+       if (dst->dev == net->loopback_dev || dst->dev == dev) {
+               struct net_vrf *vrf = netdev_priv(dev);
+               struct rt6_info *rt6_local;
+
+               /* release looked up dst and use cached local dst */
+               dst_release(dst);
+
+               rcu_read_lock();
+
+               rt6_local = rcu_dereference(vrf->rt6_local);
+               if (unlikely(!rt6_local)) {
+                       rcu_read_unlock();
+                       goto err;
+               }
+
+               /* Ordering issue: cached local dst is created on newlink
+                * before the IPv6 initialization. Using the local dst
+                * requires rt6i_idev to be set so make sure it is.
+                */
+               if (unlikely(!rt6_local->rt6i_idev)) {
+                       rt6_local->rt6i_idev = in6_dev_get(dev);
+                       if (!rt6_local->rt6i_idev) {
+                               rcu_read_unlock();
+                               goto err;
+                       }
+               }
+
+               dst = &rt6_local->dst;
+               dst_hold(dst);
+
+               rcu_read_unlock();
+
+               return vrf_local_xmit(skb, dev, &rt6_local->dst);
+       }
+
        skb_dst_set(skb, dst);
 
        /* strip the ethernet header added for pass through VRF device */
@@ -336,27 +377,38 @@ static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
 static void vrf_rt6_release(struct net_vrf *vrf)
 {
        struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
+       struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local);
 
-       rcu_assign_pointer(vrf->rt6, NULL);
+       RCU_INIT_POINTER(vrf->rt6, NULL);
+       RCU_INIT_POINTER(vrf->rt6_local, NULL);
+       synchronize_rcu();
 
        if (rt6)
                dst_release(&rt6->dst);
+
+       if (rt6_local) {
+               if (rt6_local->rt6i_idev)
+                       in6_dev_put(rt6_local->rt6i_idev);
+
+               dst_release(&rt6_local->dst);
+       }
 }
 
 static int vrf_rt6_create(struct net_device *dev)
 {
+       int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE;
        struct net_vrf *vrf = netdev_priv(dev);
        struct net *net = dev_net(dev);
        struct fib6_table *rt6i_table;
-       struct rt6_info *rt6;
+       struct rt6_info *rt6, *rt6_local;
        int rc = -ENOMEM;
 
        rt6i_table = fib6_new_table(net, vrf->tb_id);
        if (!rt6i_table)
                goto out;
 
-       rt6 = ip6_dst_alloc(net, dev,
-                           DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE);
+       /* create a dst for routing packets out a VRF device */
+       rt6 = ip6_dst_alloc(net, dev, flags);
        if (!rt6)
                goto out;
 
@@ -364,7 +416,25 @@ static int vrf_rt6_create(struct net_device *dev)
 
        rt6->rt6i_table = rt6i_table;
        rt6->dst.output = vrf_output6;
+
+       /* create a dst for local routing - packets sent locally
+        * to local address via the VRF device as a loopback
+        */
+       rt6_local = ip6_dst_alloc(net, dev, flags);
+       if (!rt6_local) {
+               dst_release(&rt6->dst);
+               goto out;
+       }
+
+       dst_hold(&rt6_local->dst);
+
+       rt6_local->rt6i_idev  = in6_dev_get(dev);
+       rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL;
+       rt6_local->rt6i_table = rt6i_table;
+       rt6_local->dst.input  = ip6_input;
+
        rcu_assign_pointer(vrf->rt6, rt6);
+       rcu_assign_pointer(vrf->rt6_local, rt6_local);
 
        rc = 0;
 out:
@@ -710,6 +780,16 @@ out:
 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
                                   struct sk_buff *skb)
 {
+       /* loopback traffic; do not push through packet taps again.
+        * Reset pkt_type for upper layers to process skb
+        */
+       if (skb->pkt_type == PACKET_LOOPBACK) {
+               skb->dev = vrf_dev;
+               skb->skb_iif = vrf_dev->ifindex;
+               skb->pkt_type = PACKET_HOST;
+               goto out;
+       }
+
        /* if packet is NDISC keep the ingress interface */
        if (!ipv6_ndisc_frame(skb)) {
                skb->dev = vrf_dev;
@@ -722,6 +802,7 @@ static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
                IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
        }
 
+out:
        return skb;
 }