1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * vrf.c: device driver to encapsulate a VRF space
5 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
6 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
7 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
9 * Based on dummy, team and ipvlan drivers
12 #include <linux/ethtool.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
18 #include <linux/init.h>
19 #include <linux/moduleparam.h>
20 #include <linux/netfilter.h>
21 #include <linux/rtnetlink.h>
22 #include <net/rtnetlink.h>
23 #include <linux/u64_stats_sync.h>
24 #include <linux/hashtable.h>
25 #include <linux/spinlock_types.h>
27 #include <linux/inetdevice.h>
30 #include <net/ip_fib.h>
31 #include <net/ip6_fib.h>
32 #include <net/ip6_route.h>
33 #include <net/route.h>
34 #include <net/addrconf.h>
35 #include <net/l3mdev.h>
36 #include <net/fib_rules.h>
37 #include <net/sch_generic.h>
38 #include <net/netns/generic.h>
39 #include <net/netfilter/nf_conntrack.h>
41 #define DRV_NAME "vrf"
42 #define DRV_VERSION "1.1"
44 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */
47 #define HASH_INITVAL ((u32)0xcafef00d)
50 DECLARE_HASHTABLE(ht, HT_MAP_BITS);
54 * count how many distinct tables do not comply with the strict mode
56 * shared_tables value must be 0 in order to enable the strict mode.
58 * example of the evolution of shared_tables:
60 * add vrf0 --> table 100 shared_tables = 0 | t0
61 * add vrf1 --> table 101 shared_tables = 0 | t1
62 * add vrf2 --> table 100 shared_tables = 1 | t2
63 * add vrf3 --> table 100 shared_tables = 1 | t3
64 * add vrf4 --> table 101 shared_tables = 2 v t4
66 * shared_tables is a "step function" (or "staircase function")
67 * and it is increased by one when the second vrf is associated to a
70 * at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1.
72 * at t3, another dev (vrf3) is bound to the same table 100 but the
73 * value of shared_tables is still 1.
74 * This means that no matter how many new vrfs will register on the
75 * table 100, the shared_tables will not increase (considering only
78 * at t4, vrf4 is bound to table 101, and shared_tables = 2.
80 * Looking at the value of shared_tables we can immediately know if
81 * the strict_mode can or cannot be enforced. Indeed, strict_mode
82 * can be enforced iff shared_tables = 0.
84 * Conversely, shared_tables is decreased when a vrf is de-associated
85 * from a table with exactly two associated vrfs.
93 struct hlist_node hnode;
94 struct list_head vrf_list; /* VRFs registered to this table */
101 static unsigned int vrf_net_id;
103 /* per netns vrf data */
105 /* protected by rtnl lock */
109 struct ctl_table_header *ctl_hdr;
113 struct rtable __rcu *rth;
114 struct rt6_info __rcu *rt6;
115 #if IS_ENABLED(CONFIG_IPV6)
116 struct fib6_table *fib6_table;
120 struct list_head me_list; /* entry in vrf_map_elem */
131 struct u64_stats_sync syncp;
134 static void vrf_rx_stats(struct net_device *dev, int len)
136 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
138 u64_stats_update_begin(&dstats->syncp);
140 dstats->rx_bytes += len;
141 u64_stats_update_end(&dstats->syncp);
144 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
146 vrf_dev->stats.tx_errors++;
150 static void vrf_get_stats64(struct net_device *dev,
151 struct rtnl_link_stats64 *stats)
155 for_each_possible_cpu(i) {
156 const struct pcpu_dstats *dstats;
157 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
160 dstats = per_cpu_ptr(dev->dstats, i);
162 start = u64_stats_fetch_begin(&dstats->syncp);
163 tbytes = dstats->tx_bytes;
164 tpkts = dstats->tx_pkts;
165 tdrops = dstats->tx_drps;
166 rbytes = dstats->rx_bytes;
167 rpkts = dstats->rx_pkts;
168 } while (u64_stats_fetch_retry(&dstats->syncp, start));
169 stats->tx_bytes += tbytes;
170 stats->tx_packets += tpkts;
171 stats->tx_dropped += tdrops;
172 stats->rx_bytes += rbytes;
173 stats->rx_packets += rpkts;
177 static struct vrf_map *netns_vrf_map(struct net *net)
179 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
181 return &nn_vrf->vmap;
184 static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev)
186 return netns_vrf_map(dev_net(dev));
189 static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me)
191 struct list_head *me_head = &me->vrf_list;
194 if (list_empty(me_head))
197 vrf = list_first_entry(me_head, struct net_vrf, me_list);
202 static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags)
204 struct vrf_map_elem *me;
206 me = kmalloc(sizeof(*me), flags);
213 static void vrf_map_elem_free(struct vrf_map_elem *me)
218 static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id,
219 int ifindex, int users)
221 me->table_id = table_id;
222 me->ifindex = ifindex;
224 INIT_LIST_HEAD(&me->vrf_list);
227 static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap,
230 struct vrf_map_elem *me;
233 key = jhash_1word(table_id, HASH_INITVAL);
234 hash_for_each_possible(vmap->ht, me, hnode, key) {
235 if (me->table_id == table_id)
242 static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me)
244 u32 table_id = me->table_id;
247 key = jhash_1word(table_id, HASH_INITVAL);
248 hash_add(vmap->ht, &me->hnode, key);
251 static void vrf_map_del_elem(struct vrf_map_elem *me)
253 hash_del(&me->hnode);
256 static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock)
258 spin_lock(&vmap->vmap_lock);
261 static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock)
263 spin_unlock(&vmap->vmap_lock);
266 /* called with rtnl lock held */
268 vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack)
270 struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
271 struct net_vrf *vrf = netdev_priv(dev);
272 struct vrf_map_elem *new_me, *me;
273 u32 table_id = vrf->tb_id;
274 bool free_new_me = false;
278 /* we pre-allocate elements used in the spin-locked section (so that we
279 * keep the spinlock as short as possible).
281 new_me = vrf_map_elem_alloc(GFP_KERNEL);
285 vrf_map_elem_init(new_me, table_id, dev->ifindex, 0);
289 me = vrf_map_lookup_elem(vmap, table_id);
292 vrf_map_add_elem(vmap, me);
296 /* we already have an entry in the vrf_map, so it means there is (at
297 * least) a vrf registered on the specific table.
300 if (vmap->strict_mode) {
301 /* vrfs cannot share the same table */
302 NL_SET_ERR_MSG(extack, "Table is used by another VRF");
310 ++vmap->shared_tables;
312 list_add(&vrf->me_list, &me->vrf_list);
317 vrf_map_unlock(vmap);
319 /* clean-up, if needed */
321 vrf_map_elem_free(new_me);
326 /* called with rtnl lock held */
327 static void vrf_map_unregister_dev(struct net_device *dev)
329 struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
330 struct net_vrf *vrf = netdev_priv(dev);
331 u32 table_id = vrf->tb_id;
332 struct vrf_map_elem *me;
337 me = vrf_map_lookup_elem(vmap, table_id);
341 list_del(&vrf->me_list);
345 --vmap->shared_tables;
346 } else if (users == 0) {
347 vrf_map_del_elem(me);
349 /* no one will refer to this element anymore */
350 vrf_map_elem_free(me);
354 vrf_map_unlock(vmap);
357 /* return the vrf device index associated with the table_id */
358 static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id)
360 struct vrf_map *vmap = netns_vrf_map(net);
361 struct vrf_map_elem *me;
366 if (!vmap->strict_mode) {
371 me = vrf_map_lookup_elem(vmap, table_id);
377 ifindex = vrf_map_elem_get_vrf_ifindex(me);
380 vrf_map_unlock(vmap);
385 /* by default VRF devices do not have a qdisc and are expected
386 * to be created with only a single queue.
388 static bool qdisc_tx_is_default(const struct net_device *dev)
390 struct netdev_queue *txq;
393 if (dev->num_tx_queues > 1)
396 txq = netdev_get_tx_queue(dev, 0);
397 qdisc = rcu_access_pointer(txq->qdisc);
399 return !qdisc->enqueue;
402 /* Local traffic destined to local address. Reinsert the packet to rx
403 * path, similar to loopback handling.
405 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
406 struct dst_entry *dst)
412 skb_dst_set(skb, dst);
414 /* set pkt_type to avoid skb hitting packet taps twice -
415 * once on Tx and again in Rx processing
417 skb->pkt_type = PACKET_LOOPBACK;
419 skb->protocol = eth_type_trans(skb, dev);
421 if (likely(__netif_rx(skb) == NET_RX_SUCCESS))
422 vrf_rx_stats(dev, len);
424 this_cpu_inc(dev->dstats->rx_drps);
429 static void vrf_nf_set_untracked(struct sk_buff *skb)
431 if (skb_get_nfct(skb) == 0)
432 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
435 static void vrf_nf_reset_ct(struct sk_buff *skb)
437 if (skb_get_nfct(skb) == IP_CT_UNTRACKED)
441 #if IS_ENABLED(CONFIG_IPV6)
442 static int vrf_ip6_local_out(struct net *net, struct sock *sk,
447 vrf_nf_reset_ct(skb);
449 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
450 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
452 if (likely(err == 1))
453 err = dst_output(net, sk, skb);
458 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
459 struct net_device *dev)
461 const struct ipv6hdr *iph;
462 struct net *net = dev_net(skb->dev);
464 int ret = NET_XMIT_DROP;
465 struct dst_entry *dst;
466 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
468 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
473 memset(&fl6, 0, sizeof(fl6));
474 /* needed to match OIF rule */
475 fl6.flowi6_l3mdev = dev->ifindex;
476 fl6.flowi6_iif = LOOPBACK_IFINDEX;
477 fl6.daddr = iph->daddr;
478 fl6.saddr = iph->saddr;
479 fl6.flowlabel = ip6_flowinfo(iph);
480 fl6.flowi6_mark = skb->mark;
481 fl6.flowi6_proto = iph->nexthdr;
483 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL);
484 if (IS_ERR(dst) || dst == dst_null)
489 /* if dst.dev is the VRF device again this is locally originated traffic
490 * destined to a local address. Short circuit to Rx path.
493 return vrf_local_xmit(skb, dev, dst);
495 skb_dst_set(skb, dst);
497 /* strip the ethernet header added for pass through VRF device */
498 __skb_pull(skb, skb_network_offset(skb));
500 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
501 ret = vrf_ip6_local_out(net, skb->sk, skb);
502 if (unlikely(net_xmit_eval(ret)))
503 dev->stats.tx_errors++;
505 ret = NET_XMIT_SUCCESS;
509 vrf_tx_error(dev, skb);
510 return NET_XMIT_DROP;
513 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
514 struct net_device *dev)
516 vrf_tx_error(dev, skb);
517 return NET_XMIT_DROP;
521 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
522 static int vrf_ip_local_out(struct net *net, struct sock *sk,
527 vrf_nf_reset_ct(skb);
529 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
530 skb, NULL, skb_dst(skb)->dev, dst_output);
531 if (likely(err == 1))
532 err = dst_output(net, sk, skb);
537 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
538 struct net_device *vrf_dev)
541 int ret = NET_XMIT_DROP;
543 struct net *net = dev_net(vrf_dev);
546 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
551 memset(&fl4, 0, sizeof(fl4));
552 /* needed to match OIF rule */
553 fl4.flowi4_l3mdev = vrf_dev->ifindex;
554 fl4.flowi4_iif = LOOPBACK_IFINDEX;
555 fl4.flowi4_tos = RT_TOS(ip4h->tos);
556 fl4.flowi4_flags = FLOWI_FLAG_ANYSRC;
557 fl4.flowi4_proto = ip4h->protocol;
558 fl4.daddr = ip4h->daddr;
559 fl4.saddr = ip4h->saddr;
561 rt = ip_route_output_flow(net, &fl4, NULL);
567 /* if dst.dev is the VRF device again this is locally originated traffic
568 * destined to a local address. Short circuit to Rx path.
570 if (rt->dst.dev == vrf_dev)
571 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
573 skb_dst_set(skb, &rt->dst);
575 /* strip the ethernet header added for pass through VRF device */
576 __skb_pull(skb, skb_network_offset(skb));
579 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
583 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
584 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
585 if (unlikely(net_xmit_eval(ret)))
586 vrf_dev->stats.tx_errors++;
588 ret = NET_XMIT_SUCCESS;
593 vrf_tx_error(vrf_dev, skb);
597 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
599 switch (skb->protocol) {
600 case htons(ETH_P_IP):
601 return vrf_process_v4_outbound(skb, dev);
602 case htons(ETH_P_IPV6):
603 return vrf_process_v6_outbound(skb, dev);
605 vrf_tx_error(dev, skb);
606 return NET_XMIT_DROP;
610 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
613 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
615 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
616 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
618 u64_stats_update_begin(&dstats->syncp);
620 dstats->tx_bytes += len;
621 u64_stats_update_end(&dstats->syncp);
623 this_cpu_inc(dev->dstats->tx_drps);
629 static void vrf_finish_direct(struct sk_buff *skb)
631 struct net_device *vrf_dev = skb->dev;
633 if (!list_empty(&vrf_dev->ptype_all) &&
634 likely(skb_headroom(skb) >= ETH_HLEN)) {
635 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
637 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
638 eth_zero_addr(eth->h_dest);
639 eth->h_proto = skb->protocol;
641 dev_queue_xmit_nit(skb, vrf_dev);
643 skb_pull(skb, ETH_HLEN);
646 vrf_nf_reset_ct(skb);
649 #if IS_ENABLED(CONFIG_IPV6)
650 /* modelled after ip6_finish_output2 */
651 static int vrf_finish_output6(struct net *net, struct sock *sk,
654 struct dst_entry *dst = skb_dst(skb);
655 struct net_device *dev = dst->dev;
656 const struct in6_addr *nexthop;
657 struct neighbour *neigh;
660 vrf_nf_reset_ct(skb);
662 skb->protocol = htons(ETH_P_IPV6);
666 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
667 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
668 if (unlikely(!neigh))
669 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
670 if (!IS_ERR(neigh)) {
671 sock_confirm_neigh(skb, neigh);
672 ret = neigh_output(neigh, skb, false);
678 IP6_INC_STATS(dev_net(dst->dev),
679 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
684 /* modelled after ip6_output */
685 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
687 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
688 net, sk, skb, NULL, skb_dst(skb)->dev,
690 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
693 /* set dst on skb to send packet to us via dev_xmit path. Allows
694 * packet to go through device based features such as qdisc, netfilter
695 * hooks and packet sockets with skb->dev set to vrf device.
697 static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
700 struct net_vrf *vrf = netdev_priv(vrf_dev);
701 struct dst_entry *dst = NULL;
702 struct rt6_info *rt6;
706 rt6 = rcu_dereference(vrf->rt6);
714 if (unlikely(!dst)) {
715 vrf_tx_error(vrf_dev, skb);
720 skb_dst_set(skb, dst);
725 static int vrf_output6_direct_finish(struct net *net, struct sock *sk,
728 vrf_finish_direct(skb);
730 return vrf_ip6_local_out(net, sk, skb);
733 static int vrf_output6_direct(struct net *net, struct sock *sk,
738 skb->protocol = htons(ETH_P_IPV6);
740 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
741 err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb,
742 NULL, skb->dev, vrf_output6_direct_finish);
744 if (likely(err == 1))
745 vrf_finish_direct(skb);
750 static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk,
755 err = vrf_output6_direct(net, sk, skb);
756 if (likely(err == 1))
757 err = vrf_ip6_local_out(net, sk, skb);
762 static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
766 struct net *net = dev_net(vrf_dev);
771 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
772 skb, NULL, vrf_dev, vrf_ip6_out_direct_finish);
774 if (likely(err == 1))
775 err = vrf_output6_direct(net, sk, skb);
777 if (likely(err == 1))
783 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
787 /* don't divert link scope packets */
788 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
791 vrf_nf_set_untracked(skb);
793 if (qdisc_tx_is_default(vrf_dev) ||
794 IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
795 return vrf_ip6_out_direct(vrf_dev, sk, skb);
797 return vrf_ip6_out_redirect(vrf_dev, skb);
801 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
803 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
804 struct net *net = dev_net(dev);
805 struct dst_entry *dst;
807 RCU_INIT_POINTER(vrf->rt6, NULL);
810 /* move dev in dst's to loopback so this VRF device can be deleted
811 * - based on dst_ifdown
815 netdev_ref_replace(dst->dev, net->loopback_dev,
816 &dst->dev_tracker, GFP_KERNEL);
817 dst->dev = net->loopback_dev;
822 static int vrf_rt6_create(struct net_device *dev)
824 int flags = DST_NOPOLICY | DST_NOXFRM;
825 struct net_vrf *vrf = netdev_priv(dev);
826 struct net *net = dev_net(dev);
827 struct rt6_info *rt6;
830 /* IPv6 can be CONFIG enabled and then disabled runtime */
831 if (!ipv6_mod_enabled())
834 vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
835 if (!vrf->fib6_table)
838 /* create a dst for routing packets out a VRF device */
839 rt6 = ip6_dst_alloc(net, dev, flags);
843 rt6->dst.output = vrf_output6;
845 rcu_assign_pointer(vrf->rt6, rt6);
852 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
859 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
863 static int vrf_rt6_create(struct net_device *dev)
869 /* modelled after ip_finish_output2 */
870 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
872 struct dst_entry *dst = skb_dst(skb);
873 struct rtable *rt = (struct rtable *)dst;
874 struct net_device *dev = dst->dev;
875 unsigned int hh_len = LL_RESERVED_SPACE(dev);
876 struct neighbour *neigh;
877 bool is_v6gw = false;
879 vrf_nf_reset_ct(skb);
881 /* Be paranoid, rather than too clever. */
882 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
883 skb = skb_expand_head(skb, hh_len);
885 dev->stats.tx_errors++;
892 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
893 if (!IS_ERR(neigh)) {
896 sock_confirm_neigh(skb, neigh);
897 /* if crossing protocols, can not use the cached header */
898 ret = neigh_output(neigh, skb, is_v6gw);
904 vrf_tx_error(skb->dev, skb);
908 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
910 struct net_device *dev = skb_dst(skb)->dev;
912 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
915 skb->protocol = htons(ETH_P_IP);
917 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
918 net, sk, skb, NULL, dev,
920 !(IPCB(skb)->flags & IPSKB_REROUTED));
923 /* set dst on skb to send packet to us via dev_xmit path. Allows
924 * packet to go through device based features such as qdisc, netfilter
925 * hooks and packet sockets with skb->dev set to vrf device.
927 static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
930 struct net_vrf *vrf = netdev_priv(vrf_dev);
931 struct dst_entry *dst = NULL;
936 rth = rcu_dereference(vrf->rth);
944 if (unlikely(!dst)) {
945 vrf_tx_error(vrf_dev, skb);
950 skb_dst_set(skb, dst);
955 static int vrf_output_direct_finish(struct net *net, struct sock *sk,
958 vrf_finish_direct(skb);
960 return vrf_ip_local_out(net, sk, skb);
963 static int vrf_output_direct(struct net *net, struct sock *sk,
968 skb->protocol = htons(ETH_P_IP);
970 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
971 err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb,
972 NULL, skb->dev, vrf_output_direct_finish);
974 if (likely(err == 1))
975 vrf_finish_direct(skb);
980 static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk,
985 err = vrf_output_direct(net, sk, skb);
986 if (likely(err == 1))
987 err = vrf_ip_local_out(net, sk, skb);
992 static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
996 struct net *net = dev_net(vrf_dev);
1001 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
1002 skb, NULL, vrf_dev, vrf_ip_out_direct_finish);
1004 if (likely(err == 1))
1005 err = vrf_output_direct(net, sk, skb);
1007 if (likely(err == 1))
1013 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
1015 struct sk_buff *skb)
1017 /* don't divert multicast or local broadcast */
1018 if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
1019 ipv4_is_lbcast(ip_hdr(skb)->daddr))
1022 vrf_nf_set_untracked(skb);
1024 if (qdisc_tx_is_default(vrf_dev) ||
1025 IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
1026 return vrf_ip_out_direct(vrf_dev, sk, skb);
1028 return vrf_ip_out_redirect(vrf_dev, skb);
1031 /* called with rcu lock held */
1032 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
1034 struct sk_buff *skb,
1039 return vrf_ip_out(vrf_dev, sk, skb);
1041 return vrf_ip6_out(vrf_dev, sk, skb);
1048 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
1050 struct rtable *rth = rtnl_dereference(vrf->rth);
1051 struct net *net = dev_net(dev);
1052 struct dst_entry *dst;
1054 RCU_INIT_POINTER(vrf->rth, NULL);
1057 /* move dev in dst's to loopback so this VRF device can be deleted
1058 * - based on dst_ifdown
1062 netdev_ref_replace(dst->dev, net->loopback_dev,
1063 &dst->dev_tracker, GFP_KERNEL);
1064 dst->dev = net->loopback_dev;
1069 static int vrf_rtable_create(struct net_device *dev)
1071 struct net_vrf *vrf = netdev_priv(dev);
1074 if (!fib_new_table(dev_net(dev), vrf->tb_id))
1077 /* create a dst for routing packets out through a VRF device */
1078 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1);
1082 rth->dst.output = vrf_output;
1084 rcu_assign_pointer(vrf->rth, rth);
1089 /**************************** device handling ********************/
1091 /* cycle interface to flush neighbor cache and move routes across tables */
1092 static void cycle_netdev(struct net_device *dev,
1093 struct netlink_ext_ack *extack)
1095 unsigned int flags = dev->flags;
1098 if (!netif_running(dev))
1101 ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
1103 ret = dev_change_flags(dev, flags, extack);
1107 "Failed to cycle device %s; route tables might be wrong!\n",
1112 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1113 struct netlink_ext_ack *extack)
1117 /* do not allow loopback device to be enslaved to a VRF.
1118 * The vrf device acts as the loopback for the vrf.
1120 if (port_dev == dev_net(dev)->loopback_dev) {
1121 NL_SET_ERR_MSG(extack,
1122 "Can not enslave loopback device to a VRF");
1126 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
1127 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
1131 cycle_netdev(port_dev, extack);
1136 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1140 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1141 struct netlink_ext_ack *extack)
1143 if (netif_is_l3_master(port_dev)) {
1144 NL_SET_ERR_MSG(extack,
1145 "Can not enslave an L3 master device to a VRF");
1149 if (netif_is_l3_slave(port_dev))
1152 return do_vrf_add_slave(dev, port_dev, extack);
1155 /* inverse of do_vrf_add_slave */
1156 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1158 netdev_upper_dev_unlink(port_dev, dev);
1159 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1161 cycle_netdev(port_dev, NULL);
1166 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1168 return do_vrf_del_slave(dev, port_dev);
1171 static void vrf_dev_uninit(struct net_device *dev)
1173 struct net_vrf *vrf = netdev_priv(dev);
1175 vrf_rtable_release(dev, vrf);
1176 vrf_rt6_release(dev, vrf);
1178 free_percpu(dev->dstats);
1182 static int vrf_dev_init(struct net_device *dev)
1184 struct net_vrf *vrf = netdev_priv(dev);
1186 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
1190 /* create the default dst which points back to us */
1191 if (vrf_rtable_create(dev) != 0)
1194 if (vrf_rt6_create(dev) != 0)
1197 dev->flags = IFF_MASTER | IFF_NOARP;
1199 /* similarly, oper state is irrelevant; set to up to avoid confusion */
1200 dev->operstate = IF_OPER_UP;
1201 netdev_lockdep_set_classes(dev);
1205 vrf_rtable_release(dev, vrf);
1207 free_percpu(dev->dstats);
1213 static const struct net_device_ops vrf_netdev_ops = {
1214 .ndo_init = vrf_dev_init,
1215 .ndo_uninit = vrf_dev_uninit,
1216 .ndo_start_xmit = vrf_xmit,
1217 .ndo_set_mac_address = eth_mac_addr,
1218 .ndo_get_stats64 = vrf_get_stats64,
1219 .ndo_add_slave = vrf_add_slave,
1220 .ndo_del_slave = vrf_del_slave,
1223 static u32 vrf_fib_table(const struct net_device *dev)
1225 struct net_vrf *vrf = netdev_priv(dev);
1230 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1236 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
1237 struct sk_buff *skb,
1238 struct net_device *dev)
1240 struct net *net = dev_net(dev);
1242 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
1243 skb = NULL; /* kfree_skb(skb) handled by nf code */
1248 static int vrf_prepare_mac_header(struct sk_buff *skb,
1249 struct net_device *vrf_dev, u16 proto)
1254 /* in general, we do not know if there is enough space in the head of
1255 * the packet for hosting the mac header.
1257 err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev));
1259 /* no space in the skb head */
1262 __skb_push(skb, ETH_HLEN);
1263 eth = (struct ethhdr *)skb->data;
1265 skb_reset_mac_header(skb);
1266 skb_reset_mac_len(skb);
1268 /* we set the ethernet destination and the source addresses to the
1269 * address of the VRF device.
1271 ether_addr_copy(eth->h_dest, vrf_dev->dev_addr);
1272 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
1273 eth->h_proto = htons(proto);
1275 /* the destination address of the Ethernet frame corresponds to the
1276 * address set on the VRF interface; therefore, the packet is intended
1277 * to be processed locally.
1279 skb->protocol = eth->h_proto;
1280 skb->pkt_type = PACKET_HOST;
1282 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
1284 skb_pull_inline(skb, ETH_HLEN);
1289 /* prepare and add the mac header to the packet if it was not set previously.
1290 * In this way, packet sniffers such as tcpdump can parse the packet correctly.
1291 * If the mac header was already set, the original mac header is left
1292 * untouched and the function returns immediately.
1294 static int vrf_add_mac_header_if_unset(struct sk_buff *skb,
1295 struct net_device *vrf_dev,
1296 u16 proto, struct net_device *orig_dev)
1298 if (skb_mac_header_was_set(skb) && dev_has_header(orig_dev))
1301 return vrf_prepare_mac_header(skb, vrf_dev, proto);
1304 #if IS_ENABLED(CONFIG_IPV6)
1305 /* neighbor handling is done with actual device; do not want
1306 * to flip skb->dev for those ndisc packets. This really fails
1307 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
1310 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
1312 const struct ipv6hdr *iph = ipv6_hdr(skb);
1315 if (iph->nexthdr == NEXTHDR_ICMP) {
1316 const struct icmp6hdr *icmph;
1317 struct icmp6hdr _icmph;
1319 icmph = skb_header_pointer(skb, sizeof(*iph),
1320 sizeof(_icmph), &_icmph);
1324 switch (icmph->icmp6_type) {
1325 case NDISC_ROUTER_SOLICITATION:
1326 case NDISC_ROUTER_ADVERTISEMENT:
1327 case NDISC_NEIGHBOUR_SOLICITATION:
1328 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1329 case NDISC_REDIRECT:
1339 static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
1340 const struct net_device *dev,
1343 const struct sk_buff *skb,
1346 struct net_vrf *vrf = netdev_priv(dev);
1348 return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
1351 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
1354 const struct ipv6hdr *iph = ipv6_hdr(skb);
1355 struct flowi6 fl6 = {
1356 .flowi6_iif = ifindex,
1357 .flowi6_mark = skb->mark,
1358 .flowi6_proto = iph->nexthdr,
1359 .daddr = iph->daddr,
1360 .saddr = iph->saddr,
1361 .flowlabel = ip6_flowinfo(iph),
1363 struct net *net = dev_net(vrf_dev);
1364 struct rt6_info *rt6;
1366 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
1367 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
1371 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
1374 skb_dst_set(skb, &rt6->dst);
1377 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1378 struct sk_buff *skb)
1380 int orig_iif = skb->skb_iif;
1381 bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
1382 bool is_ndisc = ipv6_ndisc_frame(skb);
1384 /* loopback, multicast & non-ND link-local traffic; do not push through
1385 * packet taps again. Reset pkt_type for upper layers to process skb.
1386 * For non-loopback strict packets, determine the dst using the original
1389 if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
1391 skb->skb_iif = vrf_dev->ifindex;
1392 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1394 if (skb->pkt_type == PACKET_LOOPBACK)
1395 skb->pkt_type = PACKET_HOST;
1397 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1402 /* if packet is NDISC then keep the ingress interface */
1404 struct net_device *orig_dev = skb->dev;
1406 vrf_rx_stats(vrf_dev, skb->len);
1408 skb->skb_iif = vrf_dev->ifindex;
1410 if (!list_empty(&vrf_dev->ptype_all)) {
1413 err = vrf_add_mac_header_if_unset(skb, vrf_dev,
1417 skb_push(skb, skb->mac_len);
1418 dev_queue_xmit_nit(skb, vrf_dev);
1419 skb_pull(skb, skb->mac_len);
1423 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1427 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1429 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1435 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1436 struct sk_buff *skb)
1442 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1443 struct sk_buff *skb)
1445 struct net_device *orig_dev = skb->dev;
1448 skb->skb_iif = vrf_dev->ifindex;
1449 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1451 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1454 /* loopback traffic; do not push through packet taps again.
1455 * Reset pkt_type for upper layers to process skb
1457 if (skb->pkt_type == PACKET_LOOPBACK) {
1458 skb->pkt_type = PACKET_HOST;
1462 vrf_rx_stats(vrf_dev, skb->len);
1464 if (!list_empty(&vrf_dev->ptype_all)) {
1467 err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP,
1470 skb_push(skb, skb->mac_len);
1471 dev_queue_xmit_nit(skb, vrf_dev);
1472 skb_pull(skb, skb->mac_len);
1476 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1481 /* called with rcu lock held */
1482 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1483 struct sk_buff *skb,
1488 return vrf_ip_rcv(vrf_dev, skb);
1490 return vrf_ip6_rcv(vrf_dev, skb);
1496 #if IS_ENABLED(CONFIG_IPV6)
1497 /* send to link-local or multicast address via interface enslaved to
1498 * VRF device. Force lookup to VRF table without changing flow struct
1499 * Note: Caller to this function must hold rcu_read_lock() and no refcnt
1500 * is taken on the dst by this function.
1502 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1505 struct net *net = dev_net(dev);
1506 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF;
1507 struct dst_entry *dst = NULL;
1508 struct rt6_info *rt;
1510 /* VRF device does not have a link-local address and
1511 * sending packets to link-local or mcast addresses over
1512 * a VRF device does not make sense
1514 if (fl6->flowi6_oif == dev->ifindex) {
1515 dst = &net->ipv6.ip6_null_entry->dst;
1519 if (!ipv6_addr_any(&fl6->saddr))
1520 flags |= RT6_LOOKUP_F_HAS_SADDR;
1522 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1530 static const struct l3mdev_ops vrf_l3mdev_ops = {
1531 .l3mdev_fib_table = vrf_fib_table,
1532 .l3mdev_l3_rcv = vrf_l3_rcv,
1533 .l3mdev_l3_out = vrf_l3_out,
1534 #if IS_ENABLED(CONFIG_IPV6)
1535 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1539 static void vrf_get_drvinfo(struct net_device *dev,
1540 struct ethtool_drvinfo *info)
1542 strscpy(info->driver, DRV_NAME, sizeof(info->driver));
1543 strscpy(info->version, DRV_VERSION, sizeof(info->version));
1546 static const struct ethtool_ops vrf_ethtool_ops = {
1547 .get_drvinfo = vrf_get_drvinfo,
1550 static inline size_t vrf_fib_rule_nl_size(void)
1554 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1555 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
1556 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
1557 sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
1562 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1564 struct fib_rule_hdr *frh;
1565 struct nlmsghdr *nlh;
1566 struct sk_buff *skb;
1569 if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) &&
1570 !ipv6_mod_enabled())
1573 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1577 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1579 goto nla_put_failure;
1581 /* rule only needs to appear once */
1582 nlh->nlmsg_flags |= NLM_F_EXCL;
1584 frh = nlmsg_data(nlh);
1585 memset(frh, 0, sizeof(*frh));
1586 frh->family = family;
1587 frh->action = FR_ACT_TO_TBL;
1589 if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
1590 goto nla_put_failure;
1592 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1593 goto nla_put_failure;
1595 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1596 goto nla_put_failure;
1598 nlmsg_end(skb, nlh);
1600 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1601 skb->sk = dev_net(dev)->rtnl;
1603 err = fib_nl_newrule(skb, nlh, NULL);
1607 err = fib_nl_delrule(skb, nlh, NULL);
1621 static int vrf_add_fib_rules(const struct net_device *dev)
1625 err = vrf_fib_rule(dev, AF_INET, true);
1629 err = vrf_fib_rule(dev, AF_INET6, true);
1633 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1634 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1639 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1640 err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
1647 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1649 vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
1652 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1654 vrf_fib_rule(dev, AF_INET6, false);
1658 vrf_fib_rule(dev, AF_INET, false);
1661 netdev_err(dev, "Failed to add FIB rules.\n");
1665 static void vrf_setup(struct net_device *dev)
1669 /* Initialize the device structure. */
1670 dev->netdev_ops = &vrf_netdev_ops;
1671 dev->l3mdev_ops = &vrf_l3mdev_ops;
1672 dev->ethtool_ops = &vrf_ethtool_ops;
1673 dev->needs_free_netdev = true;
1675 /* Fill in device structure with ethernet-generic values. */
1676 eth_hw_addr_random(dev);
1678 /* don't acquire vrf device's netif_tx_lock when transmitting */
1679 dev->features |= NETIF_F_LLTX;
1681 /* don't allow vrf devices to change network namespaces. */
1682 dev->features |= NETIF_F_NETNS_LOCAL;
1684 /* does not make sense for a VLAN to be added to a vrf device */
1685 dev->features |= NETIF_F_VLAN_CHALLENGED;
1687 /* enable offload features */
1688 dev->features |= NETIF_F_GSO_SOFTWARE;
1689 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1690 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1692 dev->hw_features = dev->features;
1693 dev->hw_enc_features = dev->features;
1695 /* default to no qdisc; user can add if desired */
1696 dev->priv_flags |= IFF_NO_QUEUE;
1697 dev->priv_flags |= IFF_NO_RX_HANDLER;
1698 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1700 /* VRF devices do not care about MTU, but if the MTU is set
1701 * too low then the ipv4 and ipv6 protocols are disabled
1702 * which breaks networking.
1704 dev->min_mtu = IPV6_MIN_MTU;
1705 dev->max_mtu = IP6_MAX_MTU;
1706 dev->mtu = dev->max_mtu;
1709 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1710 struct netlink_ext_ack *extack)
1712 if (tb[IFLA_ADDRESS]) {
1713 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1714 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1717 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1718 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1719 return -EADDRNOTAVAIL;
1725 static void vrf_dellink(struct net_device *dev, struct list_head *head)
1727 struct net_device *port_dev;
1728 struct list_head *iter;
1730 netdev_for_each_lower_dev(dev, port_dev, iter)
1731 vrf_del_slave(dev, port_dev);
1733 vrf_map_unregister_dev(dev);
1735 unregister_netdevice_queue(dev, head);
1738 static int vrf_newlink(struct net *src_net, struct net_device *dev,
1739 struct nlattr *tb[], struct nlattr *data[],
1740 struct netlink_ext_ack *extack)
1742 struct net_vrf *vrf = netdev_priv(dev);
1743 struct netns_vrf *nn_vrf;
1744 bool *add_fib_rules;
1748 if (!data || !data[IFLA_VRF_TABLE]) {
1749 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1753 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1754 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1755 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1756 "Invalid VRF table id");
1760 dev->priv_flags |= IFF_L3MDEV_MASTER;
1762 err = register_netdevice(dev);
1766 /* mapping between table_id and vrf;
1767 * note: such binding could not be done in the dev init function
1768 * because dev->ifindex id is not available yet.
1770 vrf->ifindex = dev->ifindex;
1772 err = vrf_map_register_dev(dev, extack);
1774 unregister_netdevice(dev);
1779 nn_vrf = net_generic(net, vrf_net_id);
1781 add_fib_rules = &nn_vrf->add_fib_rules;
1782 if (*add_fib_rules) {
1783 err = vrf_add_fib_rules(dev);
1785 vrf_map_unregister_dev(dev);
1786 unregister_netdevice(dev);
1789 *add_fib_rules = false;
1796 static size_t vrf_nl_getsize(const struct net_device *dev)
1798 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
1801 static int vrf_fillinfo(struct sk_buff *skb,
1802 const struct net_device *dev)
1804 struct net_vrf *vrf = netdev_priv(dev);
1806 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1809 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1810 const struct net_device *slave_dev)
1812 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
1815 static int vrf_fill_slave_info(struct sk_buff *skb,
1816 const struct net_device *vrf_dev,
1817 const struct net_device *slave_dev)
1819 struct net_vrf *vrf = netdev_priv(vrf_dev);
1821 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1827 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1828 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1831 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1833 .priv_size = sizeof(struct net_vrf),
1835 .get_size = vrf_nl_getsize,
1836 .policy = vrf_nl_policy,
1837 .validate = vrf_validate,
1838 .fill_info = vrf_fillinfo,
1840 .get_slave_size = vrf_get_slave_size,
1841 .fill_slave_info = vrf_fill_slave_info,
1843 .newlink = vrf_newlink,
1844 .dellink = vrf_dellink,
1846 .maxtype = IFLA_VRF_MAX,
1849 static int vrf_device_event(struct notifier_block *unused,
1850 unsigned long event, void *ptr)
1852 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1854 /* only care about unregister events to drop slave references */
1855 if (event == NETDEV_UNREGISTER) {
1856 struct net_device *vrf_dev;
1858 if (!netif_is_l3_slave(dev))
1861 vrf_dev = netdev_master_upper_dev_get(dev);
1862 vrf_del_slave(vrf_dev, dev);
1868 static struct notifier_block vrf_notifier_block __read_mostly = {
1869 .notifier_call = vrf_device_event,
1872 static int vrf_map_init(struct vrf_map *vmap)
1874 spin_lock_init(&vmap->vmap_lock);
1875 hash_init(vmap->ht);
1877 vmap->strict_mode = false;
1882 #ifdef CONFIG_SYSCTL
1883 static bool vrf_strict_mode(struct vrf_map *vmap)
1888 strict_mode = vmap->strict_mode;
1889 vrf_map_unlock(vmap);
1894 static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode)
1901 cur_mode = &vmap->strict_mode;
1902 if (*cur_mode == new_mode)
1906 /* disable strict mode */
1909 if (vmap->shared_tables) {
1910 /* we cannot allow strict_mode because there are some
1911 * vrfs that share one or more tables.
1917 /* no tables are shared among vrfs, so we can go back
1918 * to 1:1 association between a vrf with its table.
1924 vrf_map_unlock(vmap);
1929 static int vrf_shared_table_handler(struct ctl_table *table, int write,
1930 void *buffer, size_t *lenp, loff_t *ppos)
1932 struct net *net = (struct net *)table->extra1;
1933 struct vrf_map *vmap = netns_vrf_map(net);
1934 int proc_strict_mode = 0;
1935 struct ctl_table tmp = {
1936 .procname = table->procname,
1937 .data = &proc_strict_mode,
1938 .maxlen = sizeof(int),
1939 .mode = table->mode,
1940 .extra1 = SYSCTL_ZERO,
1941 .extra2 = SYSCTL_ONE,
1946 proc_strict_mode = vrf_strict_mode(vmap);
1948 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1950 if (write && ret == 0)
1951 ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode);
1956 static const struct ctl_table vrf_table[] = {
1958 .procname = "strict_mode",
1960 .maxlen = sizeof(int),
1962 .proc_handler = vrf_shared_table_handler,
1963 /* set by the vrf_netns_init */
1969 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
1971 struct ctl_table *table;
1973 table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL);
1977 /* init the extra1 parameter with the reference to current netns */
1978 table[0].extra1 = net;
1980 nn_vrf->ctl_hdr = register_net_sysctl_sz(net, "net/vrf", table,
1981 ARRAY_SIZE(vrf_table));
1982 if (!nn_vrf->ctl_hdr) {
1990 static void vrf_netns_exit_sysctl(struct net *net)
1992 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
1993 struct ctl_table *table;
1995 table = nn_vrf->ctl_hdr->ctl_table_arg;
1996 unregister_net_sysctl_table(nn_vrf->ctl_hdr);
2000 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
2005 static void vrf_netns_exit_sysctl(struct net *net)
2010 /* Initialize per network namespace state */
2011 static int __net_init vrf_netns_init(struct net *net)
2013 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
2015 nn_vrf->add_fib_rules = true;
2016 vrf_map_init(&nn_vrf->vmap);
2018 return vrf_netns_init_sysctl(net, nn_vrf);
2021 static void __net_exit vrf_netns_exit(struct net *net)
2023 vrf_netns_exit_sysctl(net);
2026 static struct pernet_operations vrf_net_ops __net_initdata = {
2027 .init = vrf_netns_init,
2028 .exit = vrf_netns_exit,
2030 .size = sizeof(struct netns_vrf),
2033 static int __init vrf_init_module(void)
2037 register_netdevice_notifier(&vrf_notifier_block);
2039 rc = register_pernet_subsys(&vrf_net_ops);
2043 rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF,
2044 vrf_ifindex_lookup_by_table_id);
2048 rc = rtnl_link_register(&vrf_link_ops);
2050 goto table_lookup_unreg;
2055 l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF,
2056 vrf_ifindex_lookup_by_table_id);
2059 unregister_pernet_subsys(&vrf_net_ops);
2062 unregister_netdevice_notifier(&vrf_notifier_block);
2066 module_init(vrf_init_module);
2067 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
2068 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
2069 MODULE_LICENSE("GPL");
2070 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
2071 MODULE_VERSION(DRV_VERSION);