2 * vrf.c: device driver to encapsulate a VRF space
4 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
8 * Based on dummy, team and ipvlan drivers
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
21 #include <linux/init.h>
22 #include <linux/moduleparam.h>
23 #include <linux/netfilter.h>
24 #include <linux/rtnetlink.h>
25 #include <net/rtnetlink.h>
26 #include <linux/u64_stats_sync.h>
27 #include <linux/hashtable.h>
29 #include <linux/inetdevice.h>
32 #include <net/ip_fib.h>
33 #include <net/ip6_fib.h>
34 #include <net/ip6_route.h>
35 #include <net/route.h>
36 #include <net/addrconf.h>
37 #include <net/l3mdev.h>
39 #define RT_FL_TOS(oldflp4) \
40 ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
42 #define DRV_NAME "vrf"
43 #define DRV_VERSION "1.0"
46 struct rtable __rcu *rth;
47 struct rtable __rcu *rth_local;
48 struct rt6_info __rcu *rt6;
49 struct rt6_info __rcu *rt6_local;
60 struct u64_stats_sync syncp;
63 static void vrf_rx_stats(struct net_device *dev, int len)
65 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
67 u64_stats_update_begin(&dstats->syncp);
69 dstats->rx_bytes += len;
70 u64_stats_update_end(&dstats->syncp);
73 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
75 vrf_dev->stats.tx_errors++;
79 static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
80 struct rtnl_link_stats64 *stats)
84 for_each_possible_cpu(i) {
85 const struct pcpu_dstats *dstats;
86 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
89 dstats = per_cpu_ptr(dev->dstats, i);
91 start = u64_stats_fetch_begin_irq(&dstats->syncp);
92 tbytes = dstats->tx_bytes;
93 tpkts = dstats->tx_pkts;
94 tdrops = dstats->tx_drps;
95 rbytes = dstats->rx_bytes;
96 rpkts = dstats->rx_pkts;
97 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
98 stats->tx_bytes += tbytes;
99 stats->tx_packets += tpkts;
100 stats->tx_dropped += tdrops;
101 stats->rx_bytes += rbytes;
102 stats->rx_packets += rpkts;
107 /* Local traffic destined to local address. Reinsert the packet to rx
108 * path, similar to loopback handling.
110 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
111 struct dst_entry *dst)
117 skb_dst_set(skb, dst);
120 /* set pkt_type to avoid skb hitting packet taps twice -
121 * once on Tx and again in Rx processing
123 skb->pkt_type = PACKET_LOOPBACK;
125 skb->protocol = eth_type_trans(skb, dev);
127 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
128 vrf_rx_stats(dev, len);
130 this_cpu_inc(dev->dstats->rx_drps);
135 #if IS_ENABLED(CONFIG_IPV6)
136 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
137 struct net_device *dev)
139 const struct ipv6hdr *iph = ipv6_hdr(skb);
140 struct net *net = dev_net(skb->dev);
141 struct flowi6 fl6 = {
142 /* needed to match OIF rule */
143 .flowi6_oif = dev->ifindex,
144 .flowi6_iif = LOOPBACK_IFINDEX,
147 .flowlabel = ip6_flowinfo(iph),
148 .flowi6_mark = skb->mark,
149 .flowi6_proto = iph->nexthdr,
150 .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
152 int ret = NET_XMIT_DROP;
153 struct dst_entry *dst;
154 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
156 dst = ip6_route_output(net, NULL, &fl6);
162 /* if dst.dev is loopback or the VRF device again this is locally
163 * originated traffic destined to a local address. Short circuit
164 * to Rx path using our local dst
166 if (dst->dev == net->loopback_dev || dst->dev == dev) {
167 struct net_vrf *vrf = netdev_priv(dev);
168 struct rt6_info *rt6_local;
170 /* release looked up dst and use cached local dst */
175 rt6_local = rcu_dereference(vrf->rt6_local);
176 if (unlikely(!rt6_local)) {
181 /* Ordering issue: cached local dst is created on newlink
182 * before the IPv6 initialization. Using the local dst
183 * requires rt6i_idev to be set so make sure it is.
185 if (unlikely(!rt6_local->rt6i_idev)) {
186 rt6_local->rt6i_idev = in6_dev_get(dev);
187 if (!rt6_local->rt6i_idev) {
193 dst = &rt6_local->dst;
198 return vrf_local_xmit(skb, dev, &rt6_local->dst);
201 skb_dst_set(skb, dst);
203 /* strip the ethernet header added for pass through VRF device */
204 __skb_pull(skb, skb_network_offset(skb));
206 ret = ip6_local_out(net, skb->sk, skb);
207 if (unlikely(net_xmit_eval(ret)))
208 dev->stats.tx_errors++;
210 ret = NET_XMIT_SUCCESS;
214 vrf_tx_error(dev, skb);
215 return NET_XMIT_DROP;
218 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
219 struct net_device *dev)
221 vrf_tx_error(dev, skb);
222 return NET_XMIT_DROP;
226 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
227 struct net_device *vrf_dev)
229 struct iphdr *ip4h = ip_hdr(skb);
230 int ret = NET_XMIT_DROP;
231 struct flowi4 fl4 = {
232 /* needed to match OIF rule */
233 .flowi4_oif = vrf_dev->ifindex,
234 .flowi4_iif = LOOPBACK_IFINDEX,
235 .flowi4_tos = RT_TOS(ip4h->tos),
236 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
237 FLOWI_FLAG_SKIP_NH_OIF,
238 .daddr = ip4h->daddr,
240 struct net *net = dev_net(vrf_dev);
243 rt = ip_route_output_flow(net, &fl4, NULL);
247 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
254 /* if dst.dev is loopback or the VRF device again this is locally
255 * originated traffic destined to a local address. Short circuit
256 * to Rx path using our local dst
258 if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) {
259 struct net_vrf *vrf = netdev_priv(vrf_dev);
260 struct rtable *rth_local;
261 struct dst_entry *dst = NULL;
267 rth_local = rcu_dereference(vrf->rth_local);
268 if (likely(rth_local)) {
269 dst = &rth_local->dst;
278 return vrf_local_xmit(skb, vrf_dev, dst);
281 skb_dst_set(skb, &rt->dst);
283 /* strip the ethernet header added for pass through VRF device */
284 __skb_pull(skb, skb_network_offset(skb));
287 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
291 ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
292 if (unlikely(net_xmit_eval(ret)))
293 vrf_dev->stats.tx_errors++;
295 ret = NET_XMIT_SUCCESS;
300 vrf_tx_error(vrf_dev, skb);
304 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
306 switch (skb->protocol) {
307 case htons(ETH_P_IP):
308 return vrf_process_v4_outbound(skb, dev);
309 case htons(ETH_P_IPV6):
310 return vrf_process_v6_outbound(skb, dev);
312 vrf_tx_error(dev, skb);
313 return NET_XMIT_DROP;
317 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
319 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
321 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
322 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
324 u64_stats_update_begin(&dstats->syncp);
326 dstats->tx_bytes += skb->len;
327 u64_stats_update_end(&dstats->syncp);
329 this_cpu_inc(dev->dstats->tx_drps);
335 #if IS_ENABLED(CONFIG_IPV6)
336 /* modelled after ip6_finish_output2 */
337 static int vrf_finish_output6(struct net *net, struct sock *sk,
340 struct dst_entry *dst = skb_dst(skb);
341 struct net_device *dev = dst->dev;
342 struct neighbour *neigh;
343 struct in6_addr *nexthop;
346 skb->protocol = htons(ETH_P_IPV6);
350 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
351 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
352 if (unlikely(!neigh))
353 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
354 if (!IS_ERR(neigh)) {
355 ret = dst_neigh_output(dst, neigh, skb);
356 rcu_read_unlock_bh();
359 rcu_read_unlock_bh();
361 IP6_INC_STATS(dev_net(dst->dev),
362 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
367 /* modelled after ip6_output */
368 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
370 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
371 net, sk, skb, NULL, skb_dst(skb)->dev,
373 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
377 static void vrf_rt6_release(struct net_vrf *vrf)
379 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
380 struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local);
382 RCU_INIT_POINTER(vrf->rt6, NULL);
383 RCU_INIT_POINTER(vrf->rt6_local, NULL);
387 dst_release(&rt6->dst);
390 if (rt6_local->rt6i_idev)
391 in6_dev_put(rt6_local->rt6i_idev);
393 dst_release(&rt6_local->dst);
397 static int vrf_rt6_create(struct net_device *dev)
399 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE;
400 struct net_vrf *vrf = netdev_priv(dev);
401 struct net *net = dev_net(dev);
402 struct fib6_table *rt6i_table;
403 struct rt6_info *rt6, *rt6_local;
406 rt6i_table = fib6_new_table(net, vrf->tb_id);
410 /* create a dst for routing packets out a VRF device */
411 rt6 = ip6_dst_alloc(net, dev, flags);
417 rt6->rt6i_table = rt6i_table;
418 rt6->dst.output = vrf_output6;
420 /* create a dst for local routing - packets sent locally
421 * to local address via the VRF device as a loopback
423 rt6_local = ip6_dst_alloc(net, dev, flags);
425 dst_release(&rt6->dst);
429 dst_hold(&rt6_local->dst);
431 rt6_local->rt6i_idev = in6_dev_get(dev);
432 rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL;
433 rt6_local->rt6i_table = rt6i_table;
434 rt6_local->dst.input = ip6_input;
436 rcu_assign_pointer(vrf->rt6, rt6);
437 rcu_assign_pointer(vrf->rt6_local, rt6_local);
444 static void vrf_rt6_release(struct net_vrf *vrf)
448 static int vrf_rt6_create(struct net_device *dev)
454 /* modelled after ip_finish_output2 */
455 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
457 struct dst_entry *dst = skb_dst(skb);
458 struct rtable *rt = (struct rtable *)dst;
459 struct net_device *dev = dst->dev;
460 unsigned int hh_len = LL_RESERVED_SPACE(dev);
461 struct neighbour *neigh;
465 /* Be paranoid, rather than too clever. */
466 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
467 struct sk_buff *skb2;
469 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
475 skb_set_owner_w(skb2, skb->sk);
483 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
484 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
485 if (unlikely(!neigh))
486 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
488 ret = dst_neigh_output(dst, neigh, skb);
490 rcu_read_unlock_bh();
492 if (unlikely(ret < 0))
493 vrf_tx_error(skb->dev, skb);
497 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
499 struct net_device *dev = skb_dst(skb)->dev;
501 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
504 skb->protocol = htons(ETH_P_IP);
506 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
507 net, sk, skb, NULL, dev,
509 !(IPCB(skb)->flags & IPSKB_REROUTED));
513 static void vrf_rtable_release(struct net_vrf *vrf)
515 struct rtable *rth = rtnl_dereference(vrf->rth);
516 struct rtable *rth_local = rtnl_dereference(vrf->rth_local);
518 RCU_INIT_POINTER(vrf->rth, NULL);
519 RCU_INIT_POINTER(vrf->rth_local, NULL);
523 dst_release(&rth->dst);
526 dst_release(&rth_local->dst);
529 static int vrf_rtable_create(struct net_device *dev)
531 struct net_vrf *vrf = netdev_priv(dev);
532 struct rtable *rth, *rth_local;
534 if (!fib_new_table(dev_net(dev), vrf->tb_id))
537 /* create a dst for routing packets out through a VRF device */
538 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
542 /* create a dst for local ingress routing - packets sent locally
543 * to local address via the VRF device as a loopback
545 rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0);
547 dst_release(&rth->dst);
551 rth->dst.output = vrf_output;
552 rth->rt_table_id = vrf->tb_id;
554 rth_local->rt_table_id = vrf->tb_id;
556 rcu_assign_pointer(vrf->rth, rth);
557 rcu_assign_pointer(vrf->rth_local, rth_local);
562 /**************************** device handling ********************/
564 /* cycle interface to flush neighbor cache and move routes across tables */
565 static void cycle_netdev(struct net_device *dev)
567 unsigned int flags = dev->flags;
570 if (!netif_running(dev))
573 ret = dev_change_flags(dev, flags & ~IFF_UP);
575 ret = dev_change_flags(dev, flags);
579 "Failed to cycle device %s; route tables might be wrong!\n",
584 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
588 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
592 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
593 cycle_netdev(port_dev);
598 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
600 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
603 return do_vrf_add_slave(dev, port_dev);
606 /* inverse of do_vrf_add_slave */
607 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
609 netdev_upper_dev_unlink(port_dev, dev);
610 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
612 cycle_netdev(port_dev);
617 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
619 return do_vrf_del_slave(dev, port_dev);
622 static void vrf_dev_uninit(struct net_device *dev)
624 struct net_vrf *vrf = netdev_priv(dev);
625 struct net_device *port_dev;
626 struct list_head *iter;
628 vrf_rtable_release(vrf);
629 vrf_rt6_release(vrf);
631 netdev_for_each_lower_dev(dev, port_dev, iter)
632 vrf_del_slave(dev, port_dev);
634 free_percpu(dev->dstats);
638 static int vrf_dev_init(struct net_device *dev)
640 struct net_vrf *vrf = netdev_priv(dev);
642 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
646 /* create the default dst which points back to us */
647 if (vrf_rtable_create(dev) != 0)
650 if (vrf_rt6_create(dev) != 0)
653 dev->flags = IFF_MASTER | IFF_NOARP;
655 /* MTU is irrelevant for VRF device; set to 64k similar to lo */
656 dev->mtu = 64 * 1024;
658 /* similarly, oper state is irrelevant; set to up to avoid confusion */
659 dev->operstate = IF_OPER_UP;
664 vrf_rtable_release(vrf);
666 free_percpu(dev->dstats);
672 static const struct net_device_ops vrf_netdev_ops = {
673 .ndo_init = vrf_dev_init,
674 .ndo_uninit = vrf_dev_uninit,
675 .ndo_start_xmit = vrf_xmit,
676 .ndo_get_stats64 = vrf_get_stats64,
677 .ndo_add_slave = vrf_add_slave,
678 .ndo_del_slave = vrf_del_slave,
681 static u32 vrf_fib_table(const struct net_device *dev)
683 struct net_vrf *vrf = netdev_priv(dev);
688 static struct rtable *vrf_get_rtable(const struct net_device *dev,
689 const struct flowi4 *fl4)
691 struct rtable *rth = NULL;
693 if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
694 struct net_vrf *vrf = netdev_priv(dev);
698 rth = rcu_dereference(vrf->rth);
708 /* called under rcu_read_lock */
709 static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
711 struct fib_result res = { .tclassid = 0 };
712 struct net *net = dev_net(dev);
713 u32 orig_tos = fl4->flowi4_tos;
714 u8 flags = fl4->flowi4_flags;
715 u8 scope = fl4->flowi4_scope;
716 u8 tos = RT_FL_TOS(fl4);
719 if (unlikely(!fl4->daddr))
722 fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
723 fl4->flowi4_iif = LOOPBACK_IFINDEX;
724 /* make sure oif is set to VRF device for lookup */
725 fl4->flowi4_oif = dev->ifindex;
726 fl4->flowi4_tos = tos & IPTOS_RT_MASK;
727 fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
728 RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
730 rc = fib_lookup(net, fl4, &res, 0);
732 if (res.type == RTN_LOCAL)
733 fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
735 fib_select_path(net, &res, fl4, -1);
738 fl4->flowi4_flags = flags;
739 fl4->flowi4_tos = orig_tos;
740 fl4->flowi4_scope = scope;
745 #if IS_ENABLED(CONFIG_IPV6)
746 /* neighbor handling is done with actual device; do not want
747 * to flip skb->dev for those ndisc packets. This really fails
748 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
751 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
753 const struct ipv6hdr *iph = ipv6_hdr(skb);
756 if (iph->nexthdr == NEXTHDR_ICMP) {
757 const struct icmp6hdr *icmph;
758 struct icmp6hdr _icmph;
760 icmph = skb_header_pointer(skb, sizeof(*iph),
761 sizeof(_icmph), &_icmph);
765 switch (icmph->icmp6_type) {
766 case NDISC_ROUTER_SOLICITATION:
767 case NDISC_ROUTER_ADVERTISEMENT:
768 case NDISC_NEIGHBOUR_SOLICITATION:
769 case NDISC_NEIGHBOUR_ADVERTISEMENT:
780 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
783 /* loopback traffic; do not push through packet taps again.
784 * Reset pkt_type for upper layers to process skb
786 if (skb->pkt_type == PACKET_LOOPBACK) {
788 skb->skb_iif = vrf_dev->ifindex;
789 skb->pkt_type = PACKET_HOST;
793 /* if packet is NDISC keep the ingress interface */
794 if (!ipv6_ndisc_frame(skb)) {
796 skb->skb_iif = vrf_dev->ifindex;
798 skb_push(skb, skb->mac_len);
799 dev_queue_xmit_nit(skb, vrf_dev);
800 skb_pull(skb, skb->mac_len);
802 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
810 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
817 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
821 skb->skb_iif = vrf_dev->ifindex;
823 /* loopback traffic; do not push through packet taps again.
824 * Reset pkt_type for upper layers to process skb
826 if (skb->pkt_type == PACKET_LOOPBACK) {
827 skb->pkt_type = PACKET_HOST;
831 skb_push(skb, skb->mac_len);
832 dev_queue_xmit_nit(skb, vrf_dev);
833 skb_pull(skb, skb->mac_len);
839 /* called with rcu lock held */
840 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
846 return vrf_ip_rcv(vrf_dev, skb);
848 return vrf_ip6_rcv(vrf_dev, skb);
854 #if IS_ENABLED(CONFIG_IPV6)
855 static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
856 const struct flowi6 *fl6)
858 struct dst_entry *dst = NULL;
860 if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
861 struct net_vrf *vrf = netdev_priv(dev);
866 rt = rcu_dereference(vrf->rt6);
879 static const struct l3mdev_ops vrf_l3mdev_ops = {
880 .l3mdev_fib_table = vrf_fib_table,
881 .l3mdev_get_rtable = vrf_get_rtable,
882 .l3mdev_get_saddr = vrf_get_saddr,
883 .l3mdev_l3_rcv = vrf_l3_rcv,
884 #if IS_ENABLED(CONFIG_IPV6)
885 .l3mdev_get_rt6_dst = vrf_get_rt6_dst,
889 static void vrf_get_drvinfo(struct net_device *dev,
890 struct ethtool_drvinfo *info)
892 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
893 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
896 static const struct ethtool_ops vrf_ethtool_ops = {
897 .get_drvinfo = vrf_get_drvinfo,
900 static void vrf_setup(struct net_device *dev)
904 /* Initialize the device structure. */
905 dev->netdev_ops = &vrf_netdev_ops;
906 dev->l3mdev_ops = &vrf_l3mdev_ops;
907 dev->ethtool_ops = &vrf_ethtool_ops;
908 dev->destructor = free_netdev;
910 /* Fill in device structure with ethernet-generic values. */
911 eth_hw_addr_random(dev);
913 /* don't acquire vrf device's netif_tx_lock when transmitting */
914 dev->features |= NETIF_F_LLTX;
916 /* don't allow vrf devices to change network namespaces. */
917 dev->features |= NETIF_F_NETNS_LOCAL;
920 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
922 if (tb[IFLA_ADDRESS]) {
923 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
925 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
926 return -EADDRNOTAVAIL;
931 static void vrf_dellink(struct net_device *dev, struct list_head *head)
933 unregister_netdevice_queue(dev, head);
936 static int vrf_newlink(struct net *src_net, struct net_device *dev,
937 struct nlattr *tb[], struct nlattr *data[])
939 struct net_vrf *vrf = netdev_priv(dev);
941 if (!data || !data[IFLA_VRF_TABLE])
944 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
946 dev->priv_flags |= IFF_L3MDEV_MASTER;
948 return register_netdevice(dev);
951 static size_t vrf_nl_getsize(const struct net_device *dev)
953 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
956 static int vrf_fillinfo(struct sk_buff *skb,
957 const struct net_device *dev)
959 struct net_vrf *vrf = netdev_priv(dev);
961 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
964 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
965 const struct net_device *slave_dev)
967 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
970 static int vrf_fill_slave_info(struct sk_buff *skb,
971 const struct net_device *vrf_dev,
972 const struct net_device *slave_dev)
974 struct net_vrf *vrf = netdev_priv(vrf_dev);
976 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
982 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
983 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
986 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
988 .priv_size = sizeof(struct net_vrf),
990 .get_size = vrf_nl_getsize,
991 .policy = vrf_nl_policy,
992 .validate = vrf_validate,
993 .fill_info = vrf_fillinfo,
995 .get_slave_size = vrf_get_slave_size,
996 .fill_slave_info = vrf_fill_slave_info,
998 .newlink = vrf_newlink,
999 .dellink = vrf_dellink,
1001 .maxtype = IFLA_VRF_MAX,
1004 static int vrf_device_event(struct notifier_block *unused,
1005 unsigned long event, void *ptr)
1007 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1009 /* only care about unregister events to drop slave references */
1010 if (event == NETDEV_UNREGISTER) {
1011 struct net_device *vrf_dev;
1013 if (!netif_is_l3_slave(dev))
1016 vrf_dev = netdev_master_upper_dev_get(dev);
1017 vrf_del_slave(vrf_dev, dev);
1023 static struct notifier_block vrf_notifier_block __read_mostly = {
1024 .notifier_call = vrf_device_event,
1027 static int __init vrf_init_module(void)
1031 register_netdevice_notifier(&vrf_notifier_block);
1033 rc = rtnl_link_register(&vrf_link_ops);
1040 unregister_netdevice_notifier(&vrf_notifier_block);
1044 module_init(vrf_init_module);
1045 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1046 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1047 MODULE_LICENSE("GPL");
1048 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1049 MODULE_VERSION(DRV_VERSION);