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;
};
u64 tx_drps;
u64 rx_pkts;
u64 rx_bytes;
- u64 rx_drps;
struct u64_stats_sync syncp;
};
-static void vrf_rx_stats(struct net_device *dev, int len)
-{
- struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
-
- u64_stats_update_begin(&dstats->syncp);
- dstats->rx_pkts++;
- dstats->rx_bytes += len;
- u64_stats_update_end(&dstats->syncp);
-}
-
static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
{
vrf_dev->stats.tx_errors++;
return stats;
}
-/* Local traffic destined to local address. Reinsert the packet to rx
- * path, similar to loopback handling.
- */
-static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
- struct dst_entry *dst)
-{
- int len = skb->len;
-
- skb_orphan(skb);
-
- skb_dst_set(skb, dst);
- skb_dst_force(skb);
-
- /* set pkt_type to avoid skb hitting packet taps twice -
- * once on Tx and again in Rx processing
- */
- skb->pkt_type = PACKET_LOOPBACK;
-
- skb->protocol = eth_type_trans(skb, dev);
-
- if (likely(netif_rx(skb) == NET_RX_SUCCESS))
- vrf_rx_stats(dev, len);
- else
- this_cpu_inc(dev->dstats->rx_drps);
-
- return NETDEV_TX_OK;
-}
-
#if IS_ENABLED(CONFIG_IPV6)
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
struct net_device *dev)
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 */
- __skb_pull(skb, skb_network_offset(skb));
-
ret = ip6_local_out(net, skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
dev->stats.tx_errors++;
}
#endif
+static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
+ struct net_device *vrf_dev)
+{
+ struct rtable *rt;
+ int err = 1;
+
+ rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
+ if (IS_ERR(rt))
+ goto out;
+
+ /* TO-DO: what about broadcast ? */
+ if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
+ ip_rt_put(rt);
+ goto out;
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ err = 0;
+out:
+ return err;
+}
+
static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
struct net_device *vrf_dev)
{
FLOWI_FLAG_SKIP_NH_OIF,
.daddr = ip4h->daddr,
};
- struct net *net = dev_net(vrf_dev);
- struct rtable *rt;
-
- rt = ip_route_output_flow(net, &fl4, NULL);
- if (IS_ERR(rt))
- goto err;
- if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
- ip_rt_put(rt);
+ if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
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 (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) {
- struct net_vrf *vrf = netdev_priv(vrf_dev);
- struct rtable *rth_local;
- struct dst_entry *dst = NULL;
-
- ip_rt_put(rt);
-
- rcu_read_lock();
-
- rth_local = rcu_dereference(vrf->rth_local);
- if (likely(rth_local)) {
- dst = &rth_local->dst;
- dst_hold(dst);
- }
-
- rcu_read_unlock();
-
- if (unlikely(!dst))
- goto err;
-
- return vrf_local_xmit(skb, vrf_dev, dst);
- }
-
- skb_dst_set(skb, &rt->dst);
-
- /* strip the ethernet header added for pass through VRF device */
- __skb_pull(skb, skb_network_offset(skb));
if (!ip4h->saddr) {
ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
{
+ /* strip the ethernet header added for pass through VRF device */
+ __skb_pull(skb, skb_network_offset(skb));
+
switch (skb->protocol) {
case htons(ETH_P_IP):
return vrf_process_v4_outbound(skb, dev);
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_INIT_POINTER(vrf->rt6, NULL);
- RCU_INIT_POINTER(vrf->rt6_local, NULL);
- synchronize_rcu();
+ rcu_assign_pointer(vrf->rt6, NULL);
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, *rt6_local;
+ struct rt6_info *rt6;
int rc = -ENOMEM;
rt6i_table = fib6_new_table(net, vrf->tb_id);
if (!rt6i_table)
goto out;
- /* create a dst for routing packets out a VRF device */
- rt6 = ip6_dst_alloc(net, dev, flags);
+ rt6 = ip6_dst_alloc(net, dev,
+ DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE);
if (!rt6)
goto out;
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:
static void vrf_rtable_release(struct net_vrf *vrf)
{
struct rtable *rth = rtnl_dereference(vrf->rth);
- struct rtable *rth_local = rtnl_dereference(vrf->rth_local);
- RCU_INIT_POINTER(vrf->rth, NULL);
- RCU_INIT_POINTER(vrf->rth_local, NULL);
- synchronize_rcu();
+ rcu_assign_pointer(vrf->rth, NULL);
if (rth)
dst_release(&rth->dst);
-
- if (rth_local)
- dst_release(&rth_local->dst);
}
static int vrf_rtable_create(struct net_device *dev)
{
struct net_vrf *vrf = netdev_priv(dev);
- struct rtable *rth, *rth_local;
+ struct rtable *rth;
if (!fib_new_table(dev_net(dev), vrf->tb_id))
return -ENOMEM;
- /* create a dst for routing packets out through a VRF device */
rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
if (!rth)
return -ENOMEM;
- /* create a dst for local ingress routing - packets sent locally
- * to local address via the VRF device as a loopback
- */
- rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0);
- if (!rth_local) {
- dst_release(&rth->dst);
- return -ENOMEM;
- }
-
rth->dst.output = vrf_output;
rth->rt_table_id = vrf->tb_id;
- rth_local->rt_table_id = vrf->tb_id;
-
rcu_assign_pointer(vrf->rth, rth);
- rcu_assign_pointer(vrf->rth_local, rth_local);
return 0;
}
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;
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
}
-out:
return skb;
}
skb->dev = vrf_dev;
skb->skb_iif = vrf_dev->ifindex;
- /* 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->pkt_type = PACKET_HOST;
- goto out;
- }
-
skb_push(skb, skb->mac_len);
dev_queue_xmit_nit(skb, vrf_dev);
skb_pull(skb, skb->mac_len);
-out:
return skb;
}
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