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_irq(&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_irq(&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_oif = 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;
482 fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
484 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL);
485 if (IS_ERR(dst) || dst == dst_null)
490 /* if dst.dev is the VRF device again this is locally originated traffic
491 * destined to a local address. Short circuit to Rx path.
494 return vrf_local_xmit(skb, dev, dst);
496 skb_dst_set(skb, dst);
498 /* strip the ethernet header added for pass through VRF device */
499 __skb_pull(skb, skb_network_offset(skb));
501 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
502 ret = vrf_ip6_local_out(net, skb->sk, skb);
503 if (unlikely(net_xmit_eval(ret)))
504 dev->stats.tx_errors++;
506 ret = NET_XMIT_SUCCESS;
510 vrf_tx_error(dev, skb);
511 return NET_XMIT_DROP;
514 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
515 struct net_device *dev)
517 vrf_tx_error(dev, skb);
518 return NET_XMIT_DROP;
522 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
523 static int vrf_ip_local_out(struct net *net, struct sock *sk,
528 vrf_nf_reset_ct(skb);
530 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
531 skb, NULL, skb_dst(skb)->dev, dst_output);
532 if (likely(err == 1))
533 err = dst_output(net, sk, skb);
538 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
539 struct net_device *vrf_dev)
542 int ret = NET_XMIT_DROP;
544 struct net *net = dev_net(vrf_dev);
547 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
552 memset(&fl4, 0, sizeof(fl4));
553 /* needed to match OIF rule */
554 fl4.flowi4_oif = vrf_dev->ifindex;
555 fl4.flowi4_iif = LOOPBACK_IFINDEX;
556 fl4.flowi4_tos = RT_TOS(ip4h->tos);
557 fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF;
558 fl4.flowi4_proto = ip4h->protocol;
559 fl4.daddr = ip4h->daddr;
560 fl4.saddr = ip4h->saddr;
562 rt = ip_route_output_flow(net, &fl4, NULL);
568 /* if dst.dev is the VRF device again this is locally originated traffic
569 * destined to a local address. Short circuit to Rx path.
571 if (rt->dst.dev == vrf_dev)
572 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
574 skb_dst_set(skb, &rt->dst);
576 /* strip the ethernet header added for pass through VRF device */
577 __skb_pull(skb, skb_network_offset(skb));
580 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
584 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
585 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
586 if (unlikely(net_xmit_eval(ret)))
587 vrf_dev->stats.tx_errors++;
589 ret = NET_XMIT_SUCCESS;
594 vrf_tx_error(vrf_dev, skb);
598 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
600 switch (skb->protocol) {
601 case htons(ETH_P_IP):
602 return vrf_process_v4_outbound(skb, dev);
603 case htons(ETH_P_IPV6):
604 return vrf_process_v6_outbound(skb, dev);
606 vrf_tx_error(dev, skb);
607 return NET_XMIT_DROP;
611 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
614 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
616 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
617 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
619 u64_stats_update_begin(&dstats->syncp);
621 dstats->tx_bytes += len;
622 u64_stats_update_end(&dstats->syncp);
624 this_cpu_inc(dev->dstats->tx_drps);
630 static void vrf_finish_direct(struct sk_buff *skb)
632 struct net_device *vrf_dev = skb->dev;
634 if (!list_empty(&vrf_dev->ptype_all) &&
635 likely(skb_headroom(skb) >= ETH_HLEN)) {
636 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
638 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
639 eth_zero_addr(eth->h_dest);
640 eth->h_proto = skb->protocol;
643 dev_queue_xmit_nit(skb, vrf_dev);
644 rcu_read_unlock_bh();
646 skb_pull(skb, ETH_HLEN);
649 vrf_nf_reset_ct(skb);
652 #if IS_ENABLED(CONFIG_IPV6)
653 /* modelled after ip6_finish_output2 */
654 static int vrf_finish_output6(struct net *net, struct sock *sk,
657 struct dst_entry *dst = skb_dst(skb);
658 struct net_device *dev = dst->dev;
659 const struct in6_addr *nexthop;
660 struct neighbour *neigh;
663 vrf_nf_reset_ct(skb);
665 skb->protocol = htons(ETH_P_IPV6);
669 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
670 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
671 if (unlikely(!neigh))
672 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
673 if (!IS_ERR(neigh)) {
674 sock_confirm_neigh(skb, neigh);
675 ret = neigh_output(neigh, skb, false);
676 rcu_read_unlock_bh();
679 rcu_read_unlock_bh();
681 IP6_INC_STATS(dev_net(dst->dev),
682 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
687 /* modelled after ip6_output */
688 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
690 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
691 net, sk, skb, NULL, skb_dst(skb)->dev,
693 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
696 /* set dst on skb to send packet to us via dev_xmit path. Allows
697 * packet to go through device based features such as qdisc, netfilter
698 * hooks and packet sockets with skb->dev set to vrf device.
700 static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
703 struct net_vrf *vrf = netdev_priv(vrf_dev);
704 struct dst_entry *dst = NULL;
705 struct rt6_info *rt6;
709 rt6 = rcu_dereference(vrf->rt6);
717 if (unlikely(!dst)) {
718 vrf_tx_error(vrf_dev, skb);
723 skb_dst_set(skb, dst);
728 static int vrf_output6_direct_finish(struct net *net, struct sock *sk,
731 vrf_finish_direct(skb);
733 return vrf_ip6_local_out(net, sk, skb);
736 static int vrf_output6_direct(struct net *net, struct sock *sk,
741 skb->protocol = htons(ETH_P_IPV6);
743 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
744 err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb,
745 NULL, skb->dev, vrf_output6_direct_finish);
747 if (likely(err == 1))
748 vrf_finish_direct(skb);
753 static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk,
758 err = vrf_output6_direct(net, sk, skb);
759 if (likely(err == 1))
760 err = vrf_ip6_local_out(net, sk, skb);
765 static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
769 struct net *net = dev_net(vrf_dev);
774 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
775 skb, NULL, vrf_dev, vrf_ip6_out_direct_finish);
777 if (likely(err == 1))
778 err = vrf_output6_direct(net, sk, skb);
780 if (likely(err == 1))
786 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
790 /* don't divert link scope packets */
791 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
794 vrf_nf_set_untracked(skb);
796 if (qdisc_tx_is_default(vrf_dev) ||
797 IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
798 return vrf_ip6_out_direct(vrf_dev, sk, skb);
800 return vrf_ip6_out_redirect(vrf_dev, skb);
804 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
806 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
807 struct net *net = dev_net(dev);
808 struct dst_entry *dst;
810 RCU_INIT_POINTER(vrf->rt6, NULL);
813 /* move dev in dst's to loopback so this VRF device can be deleted
814 * - based on dst_ifdown
818 dev_replace_track(dst->dev, net->loopback_dev,
819 &dst->dev_tracker, GFP_KERNEL);
820 dst->dev = net->loopback_dev;
825 static int vrf_rt6_create(struct net_device *dev)
827 int flags = DST_NOPOLICY | DST_NOXFRM;
828 struct net_vrf *vrf = netdev_priv(dev);
829 struct net *net = dev_net(dev);
830 struct rt6_info *rt6;
833 /* IPv6 can be CONFIG enabled and then disabled runtime */
834 if (!ipv6_mod_enabled())
837 vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
838 if (!vrf->fib6_table)
841 /* create a dst for routing packets out a VRF device */
842 rt6 = ip6_dst_alloc(net, dev, flags);
846 rt6->dst.output = vrf_output6;
848 rcu_assign_pointer(vrf->rt6, rt6);
855 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
862 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
866 static int vrf_rt6_create(struct net_device *dev)
872 /* modelled after ip_finish_output2 */
873 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
875 struct dst_entry *dst = skb_dst(skb);
876 struct rtable *rt = (struct rtable *)dst;
877 struct net_device *dev = dst->dev;
878 unsigned int hh_len = LL_RESERVED_SPACE(dev);
879 struct neighbour *neigh;
880 bool is_v6gw = false;
882 vrf_nf_reset_ct(skb);
884 /* Be paranoid, rather than too clever. */
885 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
886 skb = skb_expand_head(skb, hh_len);
888 dev->stats.tx_errors++;
895 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
896 if (!IS_ERR(neigh)) {
899 sock_confirm_neigh(skb, neigh);
900 /* if crossing protocols, can not use the cached header */
901 ret = neigh_output(neigh, skb, is_v6gw);
902 rcu_read_unlock_bh();
906 rcu_read_unlock_bh();
907 vrf_tx_error(skb->dev, skb);
911 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
913 struct net_device *dev = skb_dst(skb)->dev;
915 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
918 skb->protocol = htons(ETH_P_IP);
920 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
921 net, sk, skb, NULL, dev,
923 !(IPCB(skb)->flags & IPSKB_REROUTED));
926 /* set dst on skb to send packet to us via dev_xmit path. Allows
927 * packet to go through device based features such as qdisc, netfilter
928 * hooks and packet sockets with skb->dev set to vrf device.
930 static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
933 struct net_vrf *vrf = netdev_priv(vrf_dev);
934 struct dst_entry *dst = NULL;
939 rth = rcu_dereference(vrf->rth);
947 if (unlikely(!dst)) {
948 vrf_tx_error(vrf_dev, skb);
953 skb_dst_set(skb, dst);
958 static int vrf_output_direct_finish(struct net *net, struct sock *sk,
961 vrf_finish_direct(skb);
963 return vrf_ip_local_out(net, sk, skb);
966 static int vrf_output_direct(struct net *net, struct sock *sk,
971 skb->protocol = htons(ETH_P_IP);
973 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
974 err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb,
975 NULL, skb->dev, vrf_output_direct_finish);
977 if (likely(err == 1))
978 vrf_finish_direct(skb);
983 static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk,
988 err = vrf_output_direct(net, sk, skb);
989 if (likely(err == 1))
990 err = vrf_ip_local_out(net, sk, skb);
995 static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
999 struct net *net = dev_net(vrf_dev);
1004 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
1005 skb, NULL, vrf_dev, vrf_ip_out_direct_finish);
1007 if (likely(err == 1))
1008 err = vrf_output_direct(net, sk, skb);
1010 if (likely(err == 1))
1016 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
1018 struct sk_buff *skb)
1020 /* don't divert multicast or local broadcast */
1021 if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
1022 ipv4_is_lbcast(ip_hdr(skb)->daddr))
1025 vrf_nf_set_untracked(skb);
1027 if (qdisc_tx_is_default(vrf_dev) ||
1028 IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
1029 return vrf_ip_out_direct(vrf_dev, sk, skb);
1031 return vrf_ip_out_redirect(vrf_dev, skb);
1034 /* called with rcu lock held */
1035 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
1037 struct sk_buff *skb,
1042 return vrf_ip_out(vrf_dev, sk, skb);
1044 return vrf_ip6_out(vrf_dev, sk, skb);
1051 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
1053 struct rtable *rth = rtnl_dereference(vrf->rth);
1054 struct net *net = dev_net(dev);
1055 struct dst_entry *dst;
1057 RCU_INIT_POINTER(vrf->rth, NULL);
1060 /* move dev in dst's to loopback so this VRF device can be deleted
1061 * - based on dst_ifdown
1065 dev_replace_track(dst->dev, net->loopback_dev,
1066 &dst->dev_tracker, GFP_KERNEL);
1067 dst->dev = net->loopback_dev;
1072 static int vrf_rtable_create(struct net_device *dev)
1074 struct net_vrf *vrf = netdev_priv(dev);
1077 if (!fib_new_table(dev_net(dev), vrf->tb_id))
1080 /* create a dst for routing packets out through a VRF device */
1081 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1);
1085 rth->dst.output = vrf_output;
1087 rcu_assign_pointer(vrf->rth, rth);
1092 /**************************** device handling ********************/
1094 /* cycle interface to flush neighbor cache and move routes across tables */
1095 static void cycle_netdev(struct net_device *dev,
1096 struct netlink_ext_ack *extack)
1098 unsigned int flags = dev->flags;
1101 if (!netif_running(dev))
1104 ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
1106 ret = dev_change_flags(dev, flags, extack);
1110 "Failed to cycle device %s; route tables might be wrong!\n",
1115 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1116 struct netlink_ext_ack *extack)
1120 /* do not allow loopback device to be enslaved to a VRF.
1121 * The vrf device acts as the loopback for the vrf.
1123 if (port_dev == dev_net(dev)->loopback_dev) {
1124 NL_SET_ERR_MSG(extack,
1125 "Can not enslave loopback device to a VRF");
1129 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
1130 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
1134 cycle_netdev(port_dev, extack);
1139 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1143 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1144 struct netlink_ext_ack *extack)
1146 if (netif_is_l3_master(port_dev)) {
1147 NL_SET_ERR_MSG(extack,
1148 "Can not enslave an L3 master device to a VRF");
1152 if (netif_is_l3_slave(port_dev))
1155 return do_vrf_add_slave(dev, port_dev, extack);
1158 /* inverse of do_vrf_add_slave */
1159 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1161 netdev_upper_dev_unlink(port_dev, dev);
1162 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1164 cycle_netdev(port_dev, NULL);
1169 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1171 return do_vrf_del_slave(dev, port_dev);
1174 static void vrf_dev_uninit(struct net_device *dev)
1176 struct net_vrf *vrf = netdev_priv(dev);
1178 vrf_rtable_release(dev, vrf);
1179 vrf_rt6_release(dev, vrf);
1181 free_percpu(dev->dstats);
1185 static int vrf_dev_init(struct net_device *dev)
1187 struct net_vrf *vrf = netdev_priv(dev);
1189 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
1193 /* create the default dst which points back to us */
1194 if (vrf_rtable_create(dev) != 0)
1197 if (vrf_rt6_create(dev) != 0)
1200 dev->flags = IFF_MASTER | IFF_NOARP;
1202 /* similarly, oper state is irrelevant; set to up to avoid confusion */
1203 dev->operstate = IF_OPER_UP;
1204 netdev_lockdep_set_classes(dev);
1208 vrf_rtable_release(dev, vrf);
1210 free_percpu(dev->dstats);
1216 static const struct net_device_ops vrf_netdev_ops = {
1217 .ndo_init = vrf_dev_init,
1218 .ndo_uninit = vrf_dev_uninit,
1219 .ndo_start_xmit = vrf_xmit,
1220 .ndo_set_mac_address = eth_mac_addr,
1221 .ndo_get_stats64 = vrf_get_stats64,
1222 .ndo_add_slave = vrf_add_slave,
1223 .ndo_del_slave = vrf_del_slave,
1226 static u32 vrf_fib_table(const struct net_device *dev)
1228 struct net_vrf *vrf = netdev_priv(dev);
1233 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1239 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
1240 struct sk_buff *skb,
1241 struct net_device *dev)
1243 struct net *net = dev_net(dev);
1245 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
1246 skb = NULL; /* kfree_skb(skb) handled by nf code */
1251 static int vrf_prepare_mac_header(struct sk_buff *skb,
1252 struct net_device *vrf_dev, u16 proto)
1257 /* in general, we do not know if there is enough space in the head of
1258 * the packet for hosting the mac header.
1260 err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev));
1262 /* no space in the skb head */
1265 __skb_push(skb, ETH_HLEN);
1266 eth = (struct ethhdr *)skb->data;
1268 skb_reset_mac_header(skb);
1270 /* we set the ethernet destination and the source addresses to the
1271 * address of the VRF device.
1273 ether_addr_copy(eth->h_dest, vrf_dev->dev_addr);
1274 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
1275 eth->h_proto = htons(proto);
1277 /* the destination address of the Ethernet frame corresponds to the
1278 * address set on the VRF interface; therefore, the packet is intended
1279 * to be processed locally.
1281 skb->protocol = eth->h_proto;
1282 skb->pkt_type = PACKET_HOST;
1284 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
1286 skb_pull_inline(skb, ETH_HLEN);
1291 /* prepare and add the mac header to the packet if it was not set previously.
1292 * In this way, packet sniffers such as tcpdump can parse the packet correctly.
1293 * If the mac header was already set, the original mac header is left
1294 * untouched and the function returns immediately.
1296 static int vrf_add_mac_header_if_unset(struct sk_buff *skb,
1297 struct net_device *vrf_dev,
1300 if (skb_mac_header_was_set(skb))
1303 return vrf_prepare_mac_header(skb, vrf_dev, proto);
1306 #if IS_ENABLED(CONFIG_IPV6)
1307 /* neighbor handling is done with actual device; do not want
1308 * to flip skb->dev for those ndisc packets. This really fails
1309 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
1312 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
1314 const struct ipv6hdr *iph = ipv6_hdr(skb);
1317 if (iph->nexthdr == NEXTHDR_ICMP) {
1318 const struct icmp6hdr *icmph;
1319 struct icmp6hdr _icmph;
1321 icmph = skb_header_pointer(skb, sizeof(*iph),
1322 sizeof(_icmph), &_icmph);
1326 switch (icmph->icmp6_type) {
1327 case NDISC_ROUTER_SOLICITATION:
1328 case NDISC_ROUTER_ADVERTISEMENT:
1329 case NDISC_NEIGHBOUR_SOLICITATION:
1330 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1331 case NDISC_REDIRECT:
1341 static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
1342 const struct net_device *dev,
1345 const struct sk_buff *skb,
1348 struct net_vrf *vrf = netdev_priv(dev);
1350 return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
1353 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
1356 const struct ipv6hdr *iph = ipv6_hdr(skb);
1357 struct flowi6 fl6 = {
1358 .flowi6_iif = ifindex,
1359 .flowi6_mark = skb->mark,
1360 .flowi6_proto = iph->nexthdr,
1361 .daddr = iph->daddr,
1362 .saddr = iph->saddr,
1363 .flowlabel = ip6_flowinfo(iph),
1365 struct net *net = dev_net(vrf_dev);
1366 struct rt6_info *rt6;
1368 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
1369 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
1373 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
1376 skb_dst_set(skb, &rt6->dst);
1379 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1380 struct sk_buff *skb)
1382 int orig_iif = skb->skb_iif;
1383 bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
1384 bool is_ndisc = ipv6_ndisc_frame(skb);
1386 /* loopback, multicast & non-ND link-local traffic; do not push through
1387 * packet taps again. Reset pkt_type for upper layers to process skb.
1388 * For strict packets with a source LLA, determine the dst using the
1391 if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
1393 skb->skb_iif = vrf_dev->ifindex;
1394 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1396 if (skb->pkt_type == PACKET_LOOPBACK)
1397 skb->pkt_type = PACKET_HOST;
1398 else if (ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)
1399 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1404 /* if packet is NDISC then keep the ingress interface */
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,
1416 skb_push(skb, skb->mac_len);
1417 dev_queue_xmit_nit(skb, vrf_dev);
1418 skb_pull(skb, skb->mac_len);
1422 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1426 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1428 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1434 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1435 struct sk_buff *skb)
1441 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1442 struct sk_buff *skb)
1445 skb->skb_iif = vrf_dev->ifindex;
1446 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1448 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1451 /* loopback traffic; do not push through packet taps again.
1452 * Reset pkt_type for upper layers to process skb
1454 if (skb->pkt_type == PACKET_LOOPBACK) {
1455 skb->pkt_type = PACKET_HOST;
1459 vrf_rx_stats(vrf_dev, skb->len);
1461 if (!list_empty(&vrf_dev->ptype_all)) {
1464 err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP);
1466 skb_push(skb, skb->mac_len);
1467 dev_queue_xmit_nit(skb, vrf_dev);
1468 skb_pull(skb, skb->mac_len);
1472 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1477 /* called with rcu lock held */
1478 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1479 struct sk_buff *skb,
1484 return vrf_ip_rcv(vrf_dev, skb);
1486 return vrf_ip6_rcv(vrf_dev, skb);
1492 #if IS_ENABLED(CONFIG_IPV6)
1493 /* send to link-local or multicast address via interface enslaved to
1494 * VRF device. Force lookup to VRF table without changing flow struct
1495 * Note: Caller to this function must hold rcu_read_lock() and no refcnt
1496 * is taken on the dst by this function.
1498 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1501 struct net *net = dev_net(dev);
1502 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF;
1503 struct dst_entry *dst = NULL;
1504 struct rt6_info *rt;
1506 /* VRF device does not have a link-local address and
1507 * sending packets to link-local or mcast addresses over
1508 * a VRF device does not make sense
1510 if (fl6->flowi6_oif == dev->ifindex) {
1511 dst = &net->ipv6.ip6_null_entry->dst;
1515 if (!ipv6_addr_any(&fl6->saddr))
1516 flags |= RT6_LOOKUP_F_HAS_SADDR;
1518 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1526 static const struct l3mdev_ops vrf_l3mdev_ops = {
1527 .l3mdev_fib_table = vrf_fib_table,
1528 .l3mdev_l3_rcv = vrf_l3_rcv,
1529 .l3mdev_l3_out = vrf_l3_out,
1530 #if IS_ENABLED(CONFIG_IPV6)
1531 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1535 static void vrf_get_drvinfo(struct net_device *dev,
1536 struct ethtool_drvinfo *info)
1538 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1539 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1542 static const struct ethtool_ops vrf_ethtool_ops = {
1543 .get_drvinfo = vrf_get_drvinfo,
1546 static inline size_t vrf_fib_rule_nl_size(void)
1550 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1551 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
1552 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
1553 sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
1558 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1560 struct fib_rule_hdr *frh;
1561 struct nlmsghdr *nlh;
1562 struct sk_buff *skb;
1565 if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) &&
1566 !ipv6_mod_enabled())
1569 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1573 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1575 goto nla_put_failure;
1577 /* rule only needs to appear once */
1578 nlh->nlmsg_flags |= NLM_F_EXCL;
1580 frh = nlmsg_data(nlh);
1581 memset(frh, 0, sizeof(*frh));
1582 frh->family = family;
1583 frh->action = FR_ACT_TO_TBL;
1585 if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
1586 goto nla_put_failure;
1588 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1589 goto nla_put_failure;
1591 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1592 goto nla_put_failure;
1594 nlmsg_end(skb, nlh);
1596 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1597 skb->sk = dev_net(dev)->rtnl;
1599 err = fib_nl_newrule(skb, nlh, NULL);
1603 err = fib_nl_delrule(skb, nlh, NULL);
1617 static int vrf_add_fib_rules(const struct net_device *dev)
1621 err = vrf_fib_rule(dev, AF_INET, true);
1625 err = vrf_fib_rule(dev, AF_INET6, true);
1629 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1630 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1635 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1636 err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
1643 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1645 vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
1648 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1650 vrf_fib_rule(dev, AF_INET6, false);
1654 vrf_fib_rule(dev, AF_INET, false);
1657 netdev_err(dev, "Failed to add FIB rules.\n");
1661 static void vrf_setup(struct net_device *dev)
1665 /* Initialize the device structure. */
1666 dev->netdev_ops = &vrf_netdev_ops;
1667 dev->l3mdev_ops = &vrf_l3mdev_ops;
1668 dev->ethtool_ops = &vrf_ethtool_ops;
1669 dev->needs_free_netdev = true;
1671 /* Fill in device structure with ethernet-generic values. */
1672 eth_hw_addr_random(dev);
1674 /* don't acquire vrf device's netif_tx_lock when transmitting */
1675 dev->features |= NETIF_F_LLTX;
1677 /* don't allow vrf devices to change network namespaces. */
1678 dev->features |= NETIF_F_NETNS_LOCAL;
1680 /* does not make sense for a VLAN to be added to a vrf device */
1681 dev->features |= NETIF_F_VLAN_CHALLENGED;
1683 /* enable offload features */
1684 dev->features |= NETIF_F_GSO_SOFTWARE;
1685 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1686 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1688 dev->hw_features = dev->features;
1689 dev->hw_enc_features = dev->features;
1691 /* default to no qdisc; user can add if desired */
1692 dev->priv_flags |= IFF_NO_QUEUE;
1693 dev->priv_flags |= IFF_NO_RX_HANDLER;
1694 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1696 /* VRF devices do not care about MTU, but if the MTU is set
1697 * too low then the ipv4 and ipv6 protocols are disabled
1698 * which breaks networking.
1700 dev->min_mtu = IPV6_MIN_MTU;
1701 dev->max_mtu = IP6_MAX_MTU;
1702 dev->mtu = dev->max_mtu;
1705 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1706 struct netlink_ext_ack *extack)
1708 if (tb[IFLA_ADDRESS]) {
1709 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1710 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1713 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1714 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1715 return -EADDRNOTAVAIL;
1721 static void vrf_dellink(struct net_device *dev, struct list_head *head)
1723 struct net_device *port_dev;
1724 struct list_head *iter;
1726 netdev_for_each_lower_dev(dev, port_dev, iter)
1727 vrf_del_slave(dev, port_dev);
1729 vrf_map_unregister_dev(dev);
1731 unregister_netdevice_queue(dev, head);
1734 static int vrf_newlink(struct net *src_net, struct net_device *dev,
1735 struct nlattr *tb[], struct nlattr *data[],
1736 struct netlink_ext_ack *extack)
1738 struct net_vrf *vrf = netdev_priv(dev);
1739 struct netns_vrf *nn_vrf;
1740 bool *add_fib_rules;
1744 if (!data || !data[IFLA_VRF_TABLE]) {
1745 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1749 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1750 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1751 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1752 "Invalid VRF table id");
1756 dev->priv_flags |= IFF_L3MDEV_MASTER;
1758 err = register_netdevice(dev);
1762 /* mapping between table_id and vrf;
1763 * note: such binding could not be done in the dev init function
1764 * because dev->ifindex id is not available yet.
1766 vrf->ifindex = dev->ifindex;
1768 err = vrf_map_register_dev(dev, extack);
1770 unregister_netdevice(dev);
1775 nn_vrf = net_generic(net, vrf_net_id);
1777 add_fib_rules = &nn_vrf->add_fib_rules;
1778 if (*add_fib_rules) {
1779 err = vrf_add_fib_rules(dev);
1781 vrf_map_unregister_dev(dev);
1782 unregister_netdevice(dev);
1785 *add_fib_rules = false;
1792 static size_t vrf_nl_getsize(const struct net_device *dev)
1794 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
1797 static int vrf_fillinfo(struct sk_buff *skb,
1798 const struct net_device *dev)
1800 struct net_vrf *vrf = netdev_priv(dev);
1802 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1805 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1806 const struct net_device *slave_dev)
1808 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
1811 static int vrf_fill_slave_info(struct sk_buff *skb,
1812 const struct net_device *vrf_dev,
1813 const struct net_device *slave_dev)
1815 struct net_vrf *vrf = netdev_priv(vrf_dev);
1817 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1823 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1824 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1827 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1829 .priv_size = sizeof(struct net_vrf),
1831 .get_size = vrf_nl_getsize,
1832 .policy = vrf_nl_policy,
1833 .validate = vrf_validate,
1834 .fill_info = vrf_fillinfo,
1836 .get_slave_size = vrf_get_slave_size,
1837 .fill_slave_info = vrf_fill_slave_info,
1839 .newlink = vrf_newlink,
1840 .dellink = vrf_dellink,
1842 .maxtype = IFLA_VRF_MAX,
1845 static int vrf_device_event(struct notifier_block *unused,
1846 unsigned long event, void *ptr)
1848 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1850 /* only care about unregister events to drop slave references */
1851 if (event == NETDEV_UNREGISTER) {
1852 struct net_device *vrf_dev;
1854 if (!netif_is_l3_slave(dev))
1857 vrf_dev = netdev_master_upper_dev_get(dev);
1858 vrf_del_slave(vrf_dev, dev);
1864 static struct notifier_block vrf_notifier_block __read_mostly = {
1865 .notifier_call = vrf_device_event,
1868 static int vrf_map_init(struct vrf_map *vmap)
1870 spin_lock_init(&vmap->vmap_lock);
1871 hash_init(vmap->ht);
1873 vmap->strict_mode = false;
1878 #ifdef CONFIG_SYSCTL
1879 static bool vrf_strict_mode(struct vrf_map *vmap)
1884 strict_mode = vmap->strict_mode;
1885 vrf_map_unlock(vmap);
1890 static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode)
1897 cur_mode = &vmap->strict_mode;
1898 if (*cur_mode == new_mode)
1902 /* disable strict mode */
1905 if (vmap->shared_tables) {
1906 /* we cannot allow strict_mode because there are some
1907 * vrfs that share one or more tables.
1913 /* no tables are shared among vrfs, so we can go back
1914 * to 1:1 association between a vrf with its table.
1920 vrf_map_unlock(vmap);
1925 static int vrf_shared_table_handler(struct ctl_table *table, int write,
1926 void *buffer, size_t *lenp, loff_t *ppos)
1928 struct net *net = (struct net *)table->extra1;
1929 struct vrf_map *vmap = netns_vrf_map(net);
1930 int proc_strict_mode = 0;
1931 struct ctl_table tmp = {
1932 .procname = table->procname,
1933 .data = &proc_strict_mode,
1934 .maxlen = sizeof(int),
1935 .mode = table->mode,
1936 .extra1 = SYSCTL_ZERO,
1937 .extra2 = SYSCTL_ONE,
1942 proc_strict_mode = vrf_strict_mode(vmap);
1944 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1946 if (write && ret == 0)
1947 ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode);
1952 static const struct ctl_table vrf_table[] = {
1954 .procname = "strict_mode",
1956 .maxlen = sizeof(int),
1958 .proc_handler = vrf_shared_table_handler,
1959 /* set by the vrf_netns_init */
1965 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
1967 struct ctl_table *table;
1969 table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL);
1973 /* init the extra1 parameter with the reference to current netns */
1974 table[0].extra1 = net;
1976 nn_vrf->ctl_hdr = register_net_sysctl(net, "net/vrf", table);
1977 if (!nn_vrf->ctl_hdr) {
1985 static void vrf_netns_exit_sysctl(struct net *net)
1987 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
1988 struct ctl_table *table;
1990 table = nn_vrf->ctl_hdr->ctl_table_arg;
1991 unregister_net_sysctl_table(nn_vrf->ctl_hdr);
1995 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
2000 static void vrf_netns_exit_sysctl(struct net *net)
2005 /* Initialize per network namespace state */
2006 static int __net_init vrf_netns_init(struct net *net)
2008 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
2010 nn_vrf->add_fib_rules = true;
2011 vrf_map_init(&nn_vrf->vmap);
2013 return vrf_netns_init_sysctl(net, nn_vrf);
2016 static void __net_exit vrf_netns_exit(struct net *net)
2018 vrf_netns_exit_sysctl(net);
2021 static struct pernet_operations vrf_net_ops __net_initdata = {
2022 .init = vrf_netns_init,
2023 .exit = vrf_netns_exit,
2025 .size = sizeof(struct netns_vrf),
2028 static int __init vrf_init_module(void)
2032 register_netdevice_notifier(&vrf_notifier_block);
2034 rc = register_pernet_subsys(&vrf_net_ops);
2038 rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF,
2039 vrf_ifindex_lookup_by_table_id);
2043 rc = rtnl_link_register(&vrf_link_ops);
2045 goto table_lookup_unreg;
2050 l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF,
2051 vrf_ifindex_lookup_by_table_id);
2054 unregister_pernet_subsys(&vrf_net_ops);
2057 unregister_netdevice_notifier(&vrf_notifier_block);
2061 module_init(vrf_init_module);
2062 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
2063 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
2064 MODULE_LICENSE("GPL");
2065 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
2066 MODULE_VERSION(DRV_VERSION);