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>
38 #include <net/fib_rules.h>
39 #include <net/netns/generic.h>
41 #define DRV_NAME "vrf"
42 #define DRV_VERSION "1.0"
44 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */
46 static unsigned int vrf_net_id;
49 struct rtable __rcu *rth;
50 struct rtable __rcu *rth_local;
51 struct rt6_info __rcu *rt6;
52 struct rt6_info __rcu *rt6_local;
63 struct u64_stats_sync syncp;
66 static void vrf_rx_stats(struct net_device *dev, int len)
68 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
70 u64_stats_update_begin(&dstats->syncp);
72 dstats->rx_bytes += len;
73 u64_stats_update_end(&dstats->syncp);
76 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
78 vrf_dev->stats.tx_errors++;
82 static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
83 struct rtnl_link_stats64 *stats)
87 for_each_possible_cpu(i) {
88 const struct pcpu_dstats *dstats;
89 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
92 dstats = per_cpu_ptr(dev->dstats, i);
94 start = u64_stats_fetch_begin_irq(&dstats->syncp);
95 tbytes = dstats->tx_bytes;
96 tpkts = dstats->tx_pkts;
97 tdrops = dstats->tx_drps;
98 rbytes = dstats->rx_bytes;
99 rpkts = dstats->rx_pkts;
100 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
101 stats->tx_bytes += tbytes;
102 stats->tx_packets += tpkts;
103 stats->tx_dropped += tdrops;
104 stats->rx_bytes += rbytes;
105 stats->rx_packets += rpkts;
110 /* Local traffic destined to local address. Reinsert the packet to rx
111 * path, similar to loopback handling.
113 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
114 struct dst_entry *dst)
120 skb_dst_set(skb, dst);
123 /* set pkt_type to avoid skb hitting packet taps twice -
124 * once on Tx and again in Rx processing
126 skb->pkt_type = PACKET_LOOPBACK;
128 skb->protocol = eth_type_trans(skb, dev);
130 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
131 vrf_rx_stats(dev, len);
133 this_cpu_inc(dev->dstats->rx_drps);
138 #if IS_ENABLED(CONFIG_IPV6)
139 static int vrf_ip6_local_out(struct net *net, struct sock *sk,
144 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
145 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
147 if (likely(err == 1))
148 err = dst_output(net, sk, skb);
153 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
154 struct net_device *dev)
156 const struct ipv6hdr *iph;
157 struct net *net = dev_net(skb->dev);
159 int ret = NET_XMIT_DROP;
160 struct dst_entry *dst;
161 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
163 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
168 memset(&fl6, 0, sizeof(fl6));
169 /* needed to match OIF rule */
170 fl6.flowi6_oif = dev->ifindex;
171 fl6.flowi6_iif = LOOPBACK_IFINDEX;
172 fl6.daddr = iph->daddr;
173 fl6.saddr = iph->saddr;
174 fl6.flowlabel = ip6_flowinfo(iph);
175 fl6.flowi6_mark = skb->mark;
176 fl6.flowi6_proto = iph->nexthdr;
177 fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
179 dst = ip6_route_output(net, NULL, &fl6);
185 /* if dst.dev is loopback or the VRF device again this is locally
186 * originated traffic destined to a local address. Short circuit
187 * to Rx path using our local dst
189 if (dst->dev == net->loopback_dev || dst->dev == dev) {
190 struct net_vrf *vrf = netdev_priv(dev);
191 struct rt6_info *rt6_local;
193 /* release looked up dst and use cached local dst */
198 rt6_local = rcu_dereference(vrf->rt6_local);
199 if (unlikely(!rt6_local)) {
204 /* Ordering issue: cached local dst is created on newlink
205 * before the IPv6 initialization. Using the local dst
206 * requires rt6i_idev to be set so make sure it is.
208 if (unlikely(!rt6_local->rt6i_idev)) {
209 rt6_local->rt6i_idev = in6_dev_get(dev);
210 if (!rt6_local->rt6i_idev) {
216 dst = &rt6_local->dst;
221 return vrf_local_xmit(skb, dev, &rt6_local->dst);
224 skb_dst_set(skb, dst);
226 /* strip the ethernet header added for pass through VRF device */
227 __skb_pull(skb, skb_network_offset(skb));
229 ret = vrf_ip6_local_out(net, skb->sk, skb);
230 if (unlikely(net_xmit_eval(ret)))
231 dev->stats.tx_errors++;
233 ret = NET_XMIT_SUCCESS;
237 vrf_tx_error(dev, skb);
238 return NET_XMIT_DROP;
241 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
242 struct net_device *dev)
244 vrf_tx_error(dev, skb);
245 return NET_XMIT_DROP;
249 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
250 static int vrf_ip_local_out(struct net *net, struct sock *sk,
255 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
256 skb, NULL, skb_dst(skb)->dev, dst_output);
257 if (likely(err == 1))
258 err = dst_output(net, sk, skb);
263 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
264 struct net_device *vrf_dev)
267 int ret = NET_XMIT_DROP;
269 struct net *net = dev_net(vrf_dev);
272 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
277 memset(&fl4, 0, sizeof(fl4));
278 /* needed to match OIF rule */
279 fl4.flowi4_oif = vrf_dev->ifindex;
280 fl4.flowi4_iif = LOOPBACK_IFINDEX;
281 fl4.flowi4_tos = RT_TOS(ip4h->tos);
282 fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF;
283 fl4.flowi4_proto = ip4h->protocol;
284 fl4.daddr = ip4h->daddr;
285 fl4.saddr = ip4h->saddr;
287 rt = ip_route_output_flow(net, &fl4, NULL);
291 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
298 /* if dst.dev is loopback or the VRF device again this is locally
299 * originated traffic destined to a local address. Short circuit
300 * to Rx path using our local dst
302 if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) {
303 struct net_vrf *vrf = netdev_priv(vrf_dev);
304 struct rtable *rth_local;
305 struct dst_entry *dst = NULL;
311 rth_local = rcu_dereference(vrf->rth_local);
312 if (likely(rth_local)) {
313 dst = &rth_local->dst;
322 return vrf_local_xmit(skb, vrf_dev, dst);
325 skb_dst_set(skb, &rt->dst);
327 /* strip the ethernet header added for pass through VRF device */
328 __skb_pull(skb, skb_network_offset(skb));
331 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
335 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
336 if (unlikely(net_xmit_eval(ret)))
337 vrf_dev->stats.tx_errors++;
339 ret = NET_XMIT_SUCCESS;
344 vrf_tx_error(vrf_dev, skb);
348 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
350 switch (skb->protocol) {
351 case htons(ETH_P_IP):
352 return vrf_process_v4_outbound(skb, dev);
353 case htons(ETH_P_IPV6):
354 return vrf_process_v6_outbound(skb, dev);
356 vrf_tx_error(dev, skb);
357 return NET_XMIT_DROP;
361 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
364 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
366 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
367 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
369 u64_stats_update_begin(&dstats->syncp);
371 dstats->tx_bytes += len;
372 u64_stats_update_end(&dstats->syncp);
374 this_cpu_inc(dev->dstats->tx_drps);
380 #if IS_ENABLED(CONFIG_IPV6)
381 /* modelled after ip6_finish_output2 */
382 static int vrf_finish_output6(struct net *net, struct sock *sk,
385 struct dst_entry *dst = skb_dst(skb);
386 struct net_device *dev = dst->dev;
387 struct neighbour *neigh;
388 struct in6_addr *nexthop;
393 skb->protocol = htons(ETH_P_IPV6);
397 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
398 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
399 if (unlikely(!neigh))
400 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
401 if (!IS_ERR(neigh)) {
402 ret = dst_neigh_output(dst, neigh, skb);
403 rcu_read_unlock_bh();
406 rcu_read_unlock_bh();
408 IP6_INC_STATS(dev_net(dst->dev),
409 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
414 /* modelled after ip6_output */
415 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
417 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
418 net, sk, skb, NULL, skb_dst(skb)->dev,
420 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
423 /* set dst on skb to send packet to us via dev_xmit path. Allows
424 * packet to go through device based features such as qdisc, netfilter
425 * hooks and packet sockets with skb->dev set to vrf device.
427 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
431 struct net_vrf *vrf = netdev_priv(vrf_dev);
432 struct dst_entry *dst = NULL;
433 struct rt6_info *rt6;
435 /* don't divert link scope packets */
436 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
441 rt6 = rcu_dereference(vrf->rt6);
449 if (unlikely(!dst)) {
450 vrf_tx_error(vrf_dev, skb);
455 skb_dst_set(skb, dst);
461 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
463 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
464 struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local);
465 struct net *net = dev_net(dev);
466 struct dst_entry *dst;
468 RCU_INIT_POINTER(vrf->rt6, NULL);
469 RCU_INIT_POINTER(vrf->rt6_local, NULL);
472 /* move dev in dst's to loopback so this VRF device can be deleted
473 * - based on dst_ifdown
478 dst->dev = net->loopback_dev;
484 if (rt6_local->rt6i_idev) {
485 in6_dev_put(rt6_local->rt6i_idev);
486 rt6_local->rt6i_idev = NULL;
489 dst = &rt6_local->dst;
491 dst->dev = net->loopback_dev;
497 static int vrf_rt6_create(struct net_device *dev)
499 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE;
500 struct net_vrf *vrf = netdev_priv(dev);
501 struct net *net = dev_net(dev);
502 struct fib6_table *rt6i_table;
503 struct rt6_info *rt6, *rt6_local;
506 /* IPv6 can be CONFIG enabled and then disabled runtime */
507 if (!ipv6_mod_enabled())
510 rt6i_table = fib6_new_table(net, vrf->tb_id);
514 /* create a dst for routing packets out a VRF device */
515 rt6 = ip6_dst_alloc(net, dev, flags);
521 rt6->rt6i_table = rt6i_table;
522 rt6->dst.output = vrf_output6;
524 /* create a dst for local routing - packets sent locally
525 * to local address via the VRF device as a loopback
527 rt6_local = ip6_dst_alloc(net, dev, flags);
529 dst_release(&rt6->dst);
533 dst_hold(&rt6_local->dst);
535 rt6_local->rt6i_idev = in6_dev_get(dev);
536 rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL;
537 rt6_local->rt6i_table = rt6i_table;
538 rt6_local->dst.input = ip6_input;
540 rcu_assign_pointer(vrf->rt6, rt6);
541 rcu_assign_pointer(vrf->rt6_local, rt6_local);
548 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
555 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
559 static int vrf_rt6_create(struct net_device *dev)
565 /* modelled after ip_finish_output2 */
566 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
568 struct dst_entry *dst = skb_dst(skb);
569 struct rtable *rt = (struct rtable *)dst;
570 struct net_device *dev = dst->dev;
571 unsigned int hh_len = LL_RESERVED_SPACE(dev);
572 struct neighbour *neigh;
578 /* Be paranoid, rather than too clever. */
579 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
580 struct sk_buff *skb2;
582 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
588 skb_set_owner_w(skb2, skb->sk);
596 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
597 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
598 if (unlikely(!neigh))
599 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
600 if (!IS_ERR(neigh)) {
601 ret = dst_neigh_output(dst, neigh, skb);
602 rcu_read_unlock_bh();
606 rcu_read_unlock_bh();
608 vrf_tx_error(skb->dev, skb);
612 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
614 struct net_device *dev = skb_dst(skb)->dev;
616 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
619 skb->protocol = htons(ETH_P_IP);
621 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
622 net, sk, skb, NULL, dev,
624 !(IPCB(skb)->flags & IPSKB_REROUTED));
627 /* set dst on skb to send packet to us via dev_xmit path. Allows
628 * packet to go through device based features such as qdisc, netfilter
629 * hooks and packet sockets with skb->dev set to vrf device.
631 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
635 struct net_vrf *vrf = netdev_priv(vrf_dev);
636 struct dst_entry *dst = NULL;
641 rth = rcu_dereference(vrf->rth);
649 if (unlikely(!dst)) {
650 vrf_tx_error(vrf_dev, skb);
655 skb_dst_set(skb, dst);
660 /* called with rcu lock held */
661 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
668 return vrf_ip_out(vrf_dev, sk, skb);
670 return vrf_ip6_out(vrf_dev, sk, skb);
677 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
679 struct rtable *rth = rtnl_dereference(vrf->rth);
680 struct rtable *rth_local = rtnl_dereference(vrf->rth_local);
681 struct net *net = dev_net(dev);
682 struct dst_entry *dst;
684 RCU_INIT_POINTER(vrf->rth, NULL);
685 RCU_INIT_POINTER(vrf->rth_local, NULL);
688 /* move dev in dst's to loopback so this VRF device can be deleted
689 * - based on dst_ifdown
694 dst->dev = net->loopback_dev;
700 dst = &rth_local->dst;
702 dst->dev = net->loopback_dev;
708 static int vrf_rtable_create(struct net_device *dev)
710 struct net_vrf *vrf = netdev_priv(dev);
711 struct rtable *rth, *rth_local;
713 if (!fib_new_table(dev_net(dev), vrf->tb_id))
716 /* create a dst for routing packets out through a VRF device */
717 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
721 /* create a dst for local ingress routing - packets sent locally
722 * to local address via the VRF device as a loopback
724 rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0);
726 dst_release(&rth->dst);
730 rth->dst.output = vrf_output;
731 rth->rt_table_id = vrf->tb_id;
733 rth_local->rt_table_id = vrf->tb_id;
735 rcu_assign_pointer(vrf->rth, rth);
736 rcu_assign_pointer(vrf->rth_local, rth_local);
741 /**************************** device handling ********************/
743 /* cycle interface to flush neighbor cache and move routes across tables */
744 static void cycle_netdev(struct net_device *dev)
746 unsigned int flags = dev->flags;
749 if (!netif_running(dev))
752 ret = dev_change_flags(dev, flags & ~IFF_UP);
754 ret = dev_change_flags(dev, flags);
758 "Failed to cycle device %s; route tables might be wrong!\n",
763 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
767 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
771 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
772 cycle_netdev(port_dev);
777 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
779 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
782 return do_vrf_add_slave(dev, port_dev);
785 /* inverse of do_vrf_add_slave */
786 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
788 netdev_upper_dev_unlink(port_dev, dev);
789 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
791 cycle_netdev(port_dev);
796 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
798 return do_vrf_del_slave(dev, port_dev);
801 static void vrf_dev_uninit(struct net_device *dev)
803 struct net_vrf *vrf = netdev_priv(dev);
805 vrf_rtable_release(dev, vrf);
806 vrf_rt6_release(dev, vrf);
808 free_percpu(dev->dstats);
812 static int vrf_dev_init(struct net_device *dev)
814 struct net_vrf *vrf = netdev_priv(dev);
816 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
820 /* create the default dst which points back to us */
821 if (vrf_rtable_create(dev) != 0)
824 if (vrf_rt6_create(dev) != 0)
827 dev->flags = IFF_MASTER | IFF_NOARP;
829 /* MTU is irrelevant for VRF device; set to 64k similar to lo */
830 dev->mtu = 64 * 1024;
832 /* similarly, oper state is irrelevant; set to up to avoid confusion */
833 dev->operstate = IF_OPER_UP;
834 netdev_lockdep_set_classes(dev);
838 vrf_rtable_release(dev, vrf);
840 free_percpu(dev->dstats);
846 static const struct net_device_ops vrf_netdev_ops = {
847 .ndo_init = vrf_dev_init,
848 .ndo_uninit = vrf_dev_uninit,
849 .ndo_start_xmit = vrf_xmit,
850 .ndo_get_stats64 = vrf_get_stats64,
851 .ndo_add_slave = vrf_add_slave,
852 .ndo_del_slave = vrf_del_slave,
855 static u32 vrf_fib_table(const struct net_device *dev)
857 struct net_vrf *vrf = netdev_priv(dev);
862 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
868 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
870 struct net_device *dev)
872 struct net *net = dev_net(dev);
874 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
875 skb = NULL; /* kfree_skb(skb) handled by nf code */
880 #if IS_ENABLED(CONFIG_IPV6)
881 /* neighbor handling is done with actual device; do not want
882 * to flip skb->dev for those ndisc packets. This really fails
883 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
886 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
888 const struct ipv6hdr *iph = ipv6_hdr(skb);
891 if (iph->nexthdr == NEXTHDR_ICMP) {
892 const struct icmp6hdr *icmph;
893 struct icmp6hdr _icmph;
895 icmph = skb_header_pointer(skb, sizeof(*iph),
896 sizeof(_icmph), &_icmph);
900 switch (icmph->icmp6_type) {
901 case NDISC_ROUTER_SOLICITATION:
902 case NDISC_ROUTER_ADVERTISEMENT:
903 case NDISC_NEIGHBOUR_SOLICITATION:
904 case NDISC_NEIGHBOUR_ADVERTISEMENT:
915 static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
916 const struct net_device *dev,
921 struct net_vrf *vrf = netdev_priv(dev);
922 struct fib6_table *table = NULL;
923 struct rt6_info *rt6;
927 /* fib6_table does not have a refcnt and can not be freed */
928 rt6 = rcu_dereference(vrf->rt6);
930 table = rt6->rt6i_table;
937 return ip6_pol_route(net, table, ifindex, fl6, flags);
940 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
943 const struct ipv6hdr *iph = ipv6_hdr(skb);
944 struct flowi6 fl6 = {
947 .flowlabel = ip6_flowinfo(iph),
948 .flowi6_mark = skb->mark,
949 .flowi6_proto = iph->nexthdr,
950 .flowi6_iif = ifindex,
952 struct net *net = dev_net(vrf_dev);
953 struct rt6_info *rt6;
955 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex,
956 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
960 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
963 skb_dst_set(skb, &rt6->dst);
966 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
969 int orig_iif = skb->skb_iif;
972 /* loopback traffic; do not push through packet taps again.
973 * Reset pkt_type for upper layers to process skb
975 if (skb->pkt_type == PACKET_LOOPBACK) {
977 skb->skb_iif = vrf_dev->ifindex;
978 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
979 skb->pkt_type = PACKET_HOST;
983 /* if packet is NDISC or addressed to multicast or link-local
984 * then keep the ingress interface
986 need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
987 if (!ipv6_ndisc_frame(skb) && !need_strict) {
988 vrf_rx_stats(vrf_dev, skb->len);
990 skb->skb_iif = vrf_dev->ifindex;
992 skb_push(skb, skb->mac_len);
993 dev_queue_xmit_nit(skb, vrf_dev);
994 skb_pull(skb, skb->mac_len);
996 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1000 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1002 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1008 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1009 struct sk_buff *skb)
1015 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1016 struct sk_buff *skb)
1019 skb->skb_iif = vrf_dev->ifindex;
1020 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1022 /* loopback traffic; do not push through packet taps again.
1023 * Reset pkt_type for upper layers to process skb
1025 if (skb->pkt_type == PACKET_LOOPBACK) {
1026 skb->pkt_type = PACKET_HOST;
1030 vrf_rx_stats(vrf_dev, skb->len);
1032 skb_push(skb, skb->mac_len);
1033 dev_queue_xmit_nit(skb, vrf_dev);
1034 skb_pull(skb, skb->mac_len);
1036 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1041 /* called with rcu lock held */
1042 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1043 struct sk_buff *skb,
1048 return vrf_ip_rcv(vrf_dev, skb);
1050 return vrf_ip6_rcv(vrf_dev, skb);
1056 #if IS_ENABLED(CONFIG_IPV6)
1057 /* send to link-local or multicast address via interface enslaved to
1058 * VRF device. Force lookup to VRF table without changing flow struct
1060 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1063 struct net *net = dev_net(dev);
1064 int flags = RT6_LOOKUP_F_IFACE;
1065 struct dst_entry *dst = NULL;
1066 struct rt6_info *rt;
1068 /* VRF device does not have a link-local address and
1069 * sending packets to link-local or mcast addresses over
1070 * a VRF device does not make sense
1072 if (fl6->flowi6_oif == dev->ifindex) {
1073 dst = &net->ipv6.ip6_null_entry->dst;
1078 if (!ipv6_addr_any(&fl6->saddr))
1079 flags |= RT6_LOOKUP_F_HAS_SADDR;
1081 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags);
1089 static const struct l3mdev_ops vrf_l3mdev_ops = {
1090 .l3mdev_fib_table = vrf_fib_table,
1091 .l3mdev_l3_rcv = vrf_l3_rcv,
1092 .l3mdev_l3_out = vrf_l3_out,
1093 #if IS_ENABLED(CONFIG_IPV6)
1094 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1098 static void vrf_get_drvinfo(struct net_device *dev,
1099 struct ethtool_drvinfo *info)
1101 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1102 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1105 static const struct ethtool_ops vrf_ethtool_ops = {
1106 .get_drvinfo = vrf_get_drvinfo,
1109 static inline size_t vrf_fib_rule_nl_size(void)
1113 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1114 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
1115 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
1120 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1122 struct fib_rule_hdr *frh;
1123 struct nlmsghdr *nlh;
1124 struct sk_buff *skb;
1127 if (family == AF_INET6 && !ipv6_mod_enabled())
1130 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1134 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1136 goto nla_put_failure;
1138 /* rule only needs to appear once */
1139 nlh->nlmsg_flags |= NLM_F_EXCL;
1141 frh = nlmsg_data(nlh);
1142 memset(frh, 0, sizeof(*frh));
1143 frh->family = family;
1144 frh->action = FR_ACT_TO_TBL;
1146 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1147 goto nla_put_failure;
1149 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1150 goto nla_put_failure;
1152 nlmsg_end(skb, nlh);
1154 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1155 skb->sk = dev_net(dev)->rtnl;
1157 err = fib_nl_newrule(skb, nlh);
1161 err = fib_nl_delrule(skb, nlh);
1175 static int vrf_add_fib_rules(const struct net_device *dev)
1179 err = vrf_fib_rule(dev, AF_INET, true);
1183 err = vrf_fib_rule(dev, AF_INET6, true);
1190 vrf_fib_rule(dev, AF_INET, false);
1193 netdev_err(dev, "Failed to add FIB rules.\n");
1197 static void vrf_setup(struct net_device *dev)
1201 /* Initialize the device structure. */
1202 dev->netdev_ops = &vrf_netdev_ops;
1203 dev->l3mdev_ops = &vrf_l3mdev_ops;
1204 dev->ethtool_ops = &vrf_ethtool_ops;
1205 dev->destructor = free_netdev;
1207 /* Fill in device structure with ethernet-generic values. */
1208 eth_hw_addr_random(dev);
1210 /* don't acquire vrf device's netif_tx_lock when transmitting */
1211 dev->features |= NETIF_F_LLTX;
1213 /* don't allow vrf devices to change network namespaces. */
1214 dev->features |= NETIF_F_NETNS_LOCAL;
1216 /* does not make sense for a VLAN to be added to a vrf device */
1217 dev->features |= NETIF_F_VLAN_CHALLENGED;
1219 /* enable offload features */
1220 dev->features |= NETIF_F_GSO_SOFTWARE;
1221 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
1222 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1224 dev->hw_features = dev->features;
1225 dev->hw_enc_features = dev->features;
1227 /* default to no qdisc; user can add if desired */
1228 dev->priv_flags |= IFF_NO_QUEUE;
1231 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
1233 if (tb[IFLA_ADDRESS]) {
1234 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1236 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1237 return -EADDRNOTAVAIL;
1242 static void vrf_dellink(struct net_device *dev, struct list_head *head)
1244 struct net_device *port_dev;
1245 struct list_head *iter;
1247 netdev_for_each_lower_dev(dev, port_dev, iter)
1248 vrf_del_slave(dev, port_dev);
1250 unregister_netdevice_queue(dev, head);
1253 static int vrf_newlink(struct net *src_net, struct net_device *dev,
1254 struct nlattr *tb[], struct nlattr *data[])
1256 struct net_vrf *vrf = netdev_priv(dev);
1257 bool *add_fib_rules;
1261 if (!data || !data[IFLA_VRF_TABLE])
1264 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1265 if (vrf->tb_id == RT_TABLE_UNSPEC)
1268 dev->priv_flags |= IFF_L3MDEV_MASTER;
1270 err = register_netdevice(dev);
1275 add_fib_rules = net_generic(net, vrf_net_id);
1276 if (*add_fib_rules) {
1277 err = vrf_add_fib_rules(dev);
1279 unregister_netdevice(dev);
1282 *add_fib_rules = false;
1289 static size_t vrf_nl_getsize(const struct net_device *dev)
1291 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
1294 static int vrf_fillinfo(struct sk_buff *skb,
1295 const struct net_device *dev)
1297 struct net_vrf *vrf = netdev_priv(dev);
1299 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1302 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1303 const struct net_device *slave_dev)
1305 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
1308 static int vrf_fill_slave_info(struct sk_buff *skb,
1309 const struct net_device *vrf_dev,
1310 const struct net_device *slave_dev)
1312 struct net_vrf *vrf = netdev_priv(vrf_dev);
1314 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1320 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1321 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1324 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1326 .priv_size = sizeof(struct net_vrf),
1328 .get_size = vrf_nl_getsize,
1329 .policy = vrf_nl_policy,
1330 .validate = vrf_validate,
1331 .fill_info = vrf_fillinfo,
1333 .get_slave_size = vrf_get_slave_size,
1334 .fill_slave_info = vrf_fill_slave_info,
1336 .newlink = vrf_newlink,
1337 .dellink = vrf_dellink,
1339 .maxtype = IFLA_VRF_MAX,
1342 static int vrf_device_event(struct notifier_block *unused,
1343 unsigned long event, void *ptr)
1345 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1347 /* only care about unregister events to drop slave references */
1348 if (event == NETDEV_UNREGISTER) {
1349 struct net_device *vrf_dev;
1351 if (!netif_is_l3_slave(dev))
1354 vrf_dev = netdev_master_upper_dev_get(dev);
1355 vrf_del_slave(vrf_dev, dev);
1361 static struct notifier_block vrf_notifier_block __read_mostly = {
1362 .notifier_call = vrf_device_event,
1365 /* Initialize per network namespace state */
1366 static int __net_init vrf_netns_init(struct net *net)
1368 bool *add_fib_rules = net_generic(net, vrf_net_id);
1370 *add_fib_rules = true;
1375 static struct pernet_operations vrf_net_ops __net_initdata = {
1376 .init = vrf_netns_init,
1378 .size = sizeof(bool),
1381 static int __init vrf_init_module(void)
1385 register_netdevice_notifier(&vrf_notifier_block);
1387 rc = register_pernet_subsys(&vrf_net_ops);
1391 rc = rtnl_link_register(&vrf_link_ops);
1393 unregister_pernet_subsys(&vrf_net_ops);
1400 unregister_netdevice_notifier(&vrf_notifier_block);
1404 module_init(vrf_init_module);
1405 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1406 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1407 MODULE_LICENSE("GPL");
1408 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1409 MODULE_VERSION(DRV_VERSION);