#include <net/route.h>
#include <net/addrconf.h>
#include <net/l3mdev.h>
+#include <net/fib_rules.h>
#define RT_FL_TOS(oldflp4) \
((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
#define DRV_NAME "vrf"
#define DRV_VERSION "1.0"
+#define FIB_RULE_PREF 1000 /* default preference for FIB rules */
+static bool add_fib_rules = true;
+
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 int vrf_ip6_local_out(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ int err;
+
+ err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
+ sk, skb, NULL, skb_dst(skb)->dev, dst_output);
+
+ if (likely(err == 1))
+ err = dst_output(net, sk, skb);
+
+ return err;
+}
+
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
struct net_device *dev)
{
.flowlabel = ip6_flowinfo(iph),
.flowi6_mark = skb->mark,
.flowi6_proto = iph->nexthdr,
- .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
+ .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF,
};
int ret = NET_XMIT_DROP;
struct dst_entry *dst;
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);
- ret = ip6_local_out(net, skb->sk, skb);
+ /* strip the ethernet header added for pass through VRF device */
+ __skb_pull(skb, skb_network_offset(skb));
+
+ ret = vrf_ip6_local_out(net, skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
dev->stats.tx_errors++;
else
}
#endif
-static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
- struct net_device *vrf_dev)
+/* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
+static int vrf_ip_local_out(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
{
- struct rtable *rt;
- int err = 1;
+ int err;
- rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
- if (IS_ERR(rt))
- goto out;
+ err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
+ skb, NULL, skb_dst(skb)->dev, dst_output);
+ if (likely(err == 1))
+ err = dst_output(net, sk, skb);
- /* 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;
}
.flowi4_oif = vrf_dev->ifindex,
.flowi4_iif = LOOPBACK_IFINDEX,
.flowi4_tos = RT_TOS(ip4h->tos),
- .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
- FLOWI_FLAG_SKIP_NH_OIF,
+ .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
.daddr = ip4h->daddr,
};
+ struct net *net = dev_net(vrf_dev);
+ struct rtable *rt;
- if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
+ 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);
+ 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,
RT_SCOPE_LINK);
}
- ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
+ ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
vrf_dev->stats.tx_errors++;
else
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);
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
}
+/* set dst on skb to send packet to us via dev_xmit path. Allows
+ * packet to go through device based features such as qdisc, netfilter
+ * hooks and packet sockets with skb->dev set to vrf device.
+ */
+static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct net_vrf *vrf = netdev_priv(vrf_dev);
+ struct dst_entry *dst = NULL;
+ struct rt6_info *rt6;
+
+ /* don't divert link scope packets */
+ if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
+ return skb;
+
+ rcu_read_lock();
+
+ rt6 = rcu_dereference(vrf->rt6);
+ if (likely(rt6)) {
+ dst = &rt6->dst;
+ dst_hold(dst);
+ }
+
+ rcu_read_unlock();
+
+ if (unlikely(!dst)) {
+ vrf_tx_error(vrf_dev, skb);
+ return NULL;
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ return skb;
+}
+
/* holding rtnl */
-static void vrf_rt6_release(struct net_vrf *vrf)
+static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
{
struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
+ struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local);
+ struct net *net = dev_net(dev);
+ struct dst_entry *dst;
- rcu_assign_pointer(vrf->rt6, NULL);
+ RCU_INIT_POINTER(vrf->rt6, NULL);
+ RCU_INIT_POINTER(vrf->rt6_local, NULL);
+ synchronize_rcu();
+
+ /* move dev in dst's to loopback so this VRF device can be deleted
+ * - based on dst_ifdown
+ */
+ if (rt6) {
+ dst = &rt6->dst;
+ dev_put(dst->dev);
+ dst->dev = net->loopback_dev;
+ dev_hold(dst->dev);
+ dst_release(dst);
+ }
- if (rt6)
- dst_release(&rt6->dst);
+ if (rt6_local) {
+ if (rt6_local->rt6i_idev)
+ in6_dev_put(rt6_local->rt6i_idev);
+
+ dst = &rt6_local->dst;
+ dev_put(dst->dev);
+ dst->dev = net->loopback_dev;
+ dev_hold(dst->dev);
+ dst_release(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;
+ /* IPv6 can be CONFIG enabled and then disabled runtime */
+ if (!ipv6_mod_enabled())
+ return 0;
+
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;
dst_hold(&rt6->dst);
rt6->rt6i_table = rt6i_table;
- rt6->dst.output = vrf_output6;
+ 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:
return rc;
}
#else
-static void vrf_rt6_release(struct net_vrf *vrf)
+static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ return skb;
+}
+
+static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
{
}
!(IPCB(skb)->flags & IPSKB_REROUTED));
}
+/* set dst on skb to send packet to us via dev_xmit path. Allows
+ * packet to go through device based features such as qdisc, netfilter
+ * hooks and packet sockets with skb->dev set to vrf device.
+ */
+static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct net_vrf *vrf = netdev_priv(vrf_dev);
+ struct dst_entry *dst = NULL;
+ struct rtable *rth;
+
+ rcu_read_lock();
+
+ rth = rcu_dereference(vrf->rth);
+ if (likely(rth)) {
+ dst = &rth->dst;
+ dst_hold(dst);
+ }
+
+ rcu_read_unlock();
+
+ if (unlikely(!dst)) {
+ vrf_tx_error(vrf_dev, skb);
+ return NULL;
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ return skb;
+}
+
+/* called with rcu lock held */
+static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb,
+ u16 proto)
+{
+ switch (proto) {
+ case AF_INET:
+ return vrf_ip_out(vrf_dev, sk, skb);
+ case AF_INET6:
+ return vrf_ip6_out(vrf_dev, sk, skb);
+ }
+
+ return skb;
+}
+
/* holding rtnl */
-static void vrf_rtable_release(struct net_vrf *vrf)
+static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
{
struct rtable *rth = rtnl_dereference(vrf->rth);
+ struct rtable *rth_local = rtnl_dereference(vrf->rth_local);
+ struct net *net = dev_net(dev);
+ struct dst_entry *dst;
- rcu_assign_pointer(vrf->rth, NULL);
+ RCU_INIT_POINTER(vrf->rth, NULL);
+ RCU_INIT_POINTER(vrf->rth_local, NULL);
+ synchronize_rcu();
+
+ /* move dev in dst's to loopback so this VRF device can be deleted
+ * - based on dst_ifdown
+ */
+ if (rth) {
+ dst = &rth->dst;
+ dev_put(dst->dev);
+ dst->dev = net->loopback_dev;
+ dev_hold(dst->dev);
+ dst_release(dst);
+ }
- if (rth)
- dst_release(&rth->dst);
+ if (rth_local) {
+ dst = &rth_local->dst;
+ dev_put(dst->dev);
+ dst->dev = net->loopback_dev;
+ dev_hold(dst->dev);
+ dst_release(dst);
+ }
}
static int vrf_rtable_create(struct net_device *dev)
{
struct net_vrf *vrf = netdev_priv(dev);
- struct rtable *rth;
+ struct rtable *rth, *rth_local;
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;
- rth->dst.output = vrf_output;
+ /* 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;
}
struct net_device *port_dev;
struct list_head *iter;
- vrf_rtable_release(vrf);
- vrf_rt6_release(vrf);
+ vrf_rtable_release(dev, vrf);
+ vrf_rt6_release(dev, vrf);
netdev_for_each_lower_dev(dev, port_dev, iter)
vrf_del_slave(dev, port_dev);
dev->flags = IFF_MASTER | IFF_NOARP;
+ /* MTU is irrelevant for VRF device; set to 64k similar to lo */
+ dev->mtu = 64 * 1024;
+
+ /* similarly, oper state is irrelevant; set to up to avoid confusion */
+ dev->operstate = IF_OPER_UP;
+ netdev_lockdep_set_classes(dev);
return 0;
out_rth:
- vrf_rtable_release(vrf);
+ vrf_rtable_release(dev, vrf);
out_stats:
free_percpu(dev->dstats);
dev->dstats = NULL;
return vrf->tb_id;
}
-static struct rtable *vrf_get_rtable(const struct net_device *dev,
- const struct flowi4 *fl4)
+static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- struct rtable *rth = NULL;
-
- if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
- struct net_vrf *vrf = netdev_priv(dev);
-
- rcu_read_lock();
-
- rth = rcu_dereference(vrf->rth);
- if (likely(rth))
- dst_hold(&rth->dst);
-
- rcu_read_unlock();
- }
-
- return rth;
+ return 0;
}
-/* called under rcu_read_lock */
-static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
+static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
+ struct sk_buff *skb,
+ struct net_device *dev)
{
- struct fib_result res = { .tclassid = 0 };
struct net *net = dev_net(dev);
- u32 orig_tos = fl4->flowi4_tos;
- u8 flags = fl4->flowi4_flags;
- u8 scope = fl4->flowi4_scope;
- u8 tos = RT_FL_TOS(fl4);
- int rc;
-
- if (unlikely(!fl4->daddr))
- return 0;
- fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
- fl4->flowi4_iif = LOOPBACK_IFINDEX;
- /* make sure oif is set to VRF device for lookup */
- fl4->flowi4_oif = dev->ifindex;
- fl4->flowi4_tos = tos & IPTOS_RT_MASK;
- fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
- RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
-
- rc = fib_lookup(net, fl4, &res, 0);
- if (!rc) {
- if (res.type == RTN_LOCAL)
- fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
- else
- fib_select_path(net, &res, fl4, -1);
- }
+ nf_reset(skb);
- fl4->flowi4_flags = flags;
- fl4->flowi4_tos = orig_tos;
- fl4->flowi4_scope = scope;
+ if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0)
+ skb = NULL; /* kfree_skb(skb) handled by nf code */
- return rc;
+ return skb;
}
#if IS_ENABLED(CONFIG_IPV6)
return rc;
}
+static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
+ const struct net_device *dev,
+ struct flowi6 *fl6,
+ int ifindex,
+ int flags)
+{
+ struct net_vrf *vrf = netdev_priv(dev);
+ struct fib6_table *table = NULL;
+ struct rt6_info *rt6;
+
+ rcu_read_lock();
+
+ /* fib6_table does not have a refcnt and can not be freed */
+ rt6 = rcu_dereference(vrf->rt6);
+ if (likely(rt6))
+ table = rt6->rt6i_table;
+
+ rcu_read_unlock();
+
+ if (!table)
+ return NULL;
+
+ return ip6_pol_route(net, table, ifindex, fl6, flags);
+}
+
+static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
+ int ifindex)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct flowi6 fl6 = {
+ .daddr = iph->daddr,
+ .saddr = iph->saddr,
+ .flowlabel = ip6_flowinfo(iph),
+ .flowi6_mark = skb->mark,
+ .flowi6_proto = iph->nexthdr,
+ .flowi6_iif = ifindex,
+ };
+ struct net *net = dev_net(vrf_dev);
+ struct rt6_info *rt6;
+
+ rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex,
+ RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
+ if (unlikely(!rt6))
+ return;
+
+ if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
+ return;
+
+ skb_dst_set(skb, &rt6->dst);
+}
+
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
struct sk_buff *skb)
{
- /* if packet is NDISC keep the ingress interface */
- if (!ipv6_ndisc_frame(skb)) {
+ int orig_iif = skb->skb_iif;
+ bool need_strict;
+
+ /* 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 or addressed to multicast or link-local
+ * then keep the ingress interface
+ */
+ need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
+ if (!ipv6_ndisc_frame(skb) && !need_strict) {
skb->dev = vrf_dev;
skb->skb_iif = vrf_dev->ifindex;
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
}
+ if (need_strict)
+ vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
+
+ skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
+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);
+ skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
+out:
return skb;
}
}
#if IS_ENABLED(CONFIG_IPV6)
-static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
- const struct flowi6 *fl6)
+/* send to link-local or multicast address via interface enslaved to
+ * VRF device. Force lookup to VRF table without changing flow struct
+ */
+static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
+ struct flowi6 *fl6)
{
+ struct net *net = dev_net(dev);
+ int flags = RT6_LOOKUP_F_IFACE;
struct dst_entry *dst = NULL;
+ struct rt6_info *rt;
+
+ /* VRF device does not have a link-local address and
+ * sending packets to link-local or mcast addresses over
+ * a VRF device does not make sense
+ */
+ if (fl6->flowi6_oif == dev->ifindex) {
+ dst = &net->ipv6.ip6_null_entry->dst;
+ dst_hold(dst);
+ return dst;
+ }
- if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
- struct net_vrf *vrf = netdev_priv(dev);
- struct rt6_info *rt;
+ if (!ipv6_addr_any(&fl6->saddr))
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
- rcu_read_lock();
-
- rt = rcu_dereference(vrf->rt6);
- if (likely(rt)) {
- dst = &rt->dst;
- dst_hold(dst);
- }
-
- rcu_read_unlock();
- }
+ rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags);
+ if (rt)
+ dst = &rt->dst;
return dst;
}
static const struct l3mdev_ops vrf_l3mdev_ops = {
.l3mdev_fib_table = vrf_fib_table,
- .l3mdev_get_rtable = vrf_get_rtable,
- .l3mdev_get_saddr = vrf_get_saddr,
.l3mdev_l3_rcv = vrf_l3_rcv,
+ .l3mdev_l3_out = vrf_l3_out,
#if IS_ENABLED(CONFIG_IPV6)
- .l3mdev_get_rt6_dst = vrf_get_rt6_dst,
+ .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
#endif
};
.get_drvinfo = vrf_get_drvinfo,
};
+static inline size_t vrf_fib_rule_nl_size(void)
+{
+ size_t sz;
+
+ sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
+ sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
+ sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
+
+ return sz;
+}
+
+static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
+{
+ struct fib_rule_hdr *frh;
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ int err;
+
+ if (family == AF_INET6 && !ipv6_mod_enabled())
+ return 0;
+
+ skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
+ if (!nlh)
+ goto nla_put_failure;
+
+ /* rule only needs to appear once */
+ nlh->nlmsg_flags &= NLM_F_EXCL;
+
+ frh = nlmsg_data(nlh);
+ memset(frh, 0, sizeof(*frh));
+ frh->family = family;
+ frh->action = FR_ACT_TO_TBL;
+
+ if (nla_put_u32(skb, FRA_L3MDEV, 1))
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+
+ /* fib_nl_{new,del}rule handling looks for net from skb->sk */
+ skb->sk = dev_net(dev)->rtnl;
+ if (add_it) {
+ err = fib_nl_newrule(skb, nlh);
+ if (err == -EEXIST)
+ err = 0;
+ } else {
+ err = fib_nl_delrule(skb, nlh);
+ if (err == -ENOENT)
+ err = 0;
+ }
+ nlmsg_free(skb);
+
+ return err;
+
+nla_put_failure:
+ nlmsg_free(skb);
+
+ return -EMSGSIZE;
+}
+
+static int vrf_add_fib_rules(const struct net_device *dev)
+{
+ int err;
+
+ err = vrf_fib_rule(dev, AF_INET, true);
+ if (err < 0)
+ goto out_err;
+
+ err = vrf_fib_rule(dev, AF_INET6, true);
+ if (err < 0)
+ goto ipv6_err;
+
+ return 0;
+
+ipv6_err:
+ vrf_fib_rule(dev, AF_INET, false);
+
+out_err:
+ netdev_err(dev, "Failed to add FIB rules.\n");
+ return err;
+}
+
static void vrf_setup(struct net_device *dev)
{
ether_setup(dev);
/* don't allow vrf devices to change network namespaces. */
dev->features |= NETIF_F_NETNS_LOCAL;
+
+ /* does not make sense for a VLAN to be added to a vrf device */
+ dev->features |= NETIF_F_VLAN_CHALLENGED;
+
+ /* enable offload features */
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+ dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
+ dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
+
+ dev->hw_features = dev->features;
+ dev->hw_enc_features = dev->features;
+
+ /* default to no qdisc; user can add if desired */
+ dev->priv_flags |= IFF_NO_QUEUE;
}
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
struct nlattr *tb[], struct nlattr *data[])
{
struct net_vrf *vrf = netdev_priv(dev);
+ int err;
if (!data || !data[IFLA_VRF_TABLE])
return -EINVAL;
dev->priv_flags |= IFF_L3MDEV_MASTER;
- return register_netdevice(dev);
+ err = register_netdevice(dev);
+ if (err)
+ goto out;
+
+ if (add_fib_rules) {
+ err = vrf_add_fib_rules(dev);
+ if (err) {
+ unregister_netdevice(dev);
+ goto out;
+ }
+ add_fib_rules = false;
+ }
+
+out:
+ return err;
}
static size_t vrf_nl_getsize(const struct net_device *dev)
projects / deliverable / linux.git / blobdiff