2 * vrf.c: device driver to encapsulate a VRF space
4 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
8 * Based on dummy, team and ipvlan drivers
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
21 #include <linux/init.h>
22 #include <linux/moduleparam.h>
23 #include <linux/netfilter.h>
24 #include <linux/rtnetlink.h>
25 #include <net/rtnetlink.h>
26 #include <linux/u64_stats_sync.h>
27 #include <linux/hashtable.h>
29 #include <linux/inetdevice.h>
32 #include <net/ip_fib.h>
33 #include <net/ip6_fib.h>
34 #include <net/ip6_route.h>
35 #include <net/route.h>
36 #include <net/addrconf.h>
37 #include <net/l3mdev.h>
39 #define RT_FL_TOS(oldflp4) \
40 ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
42 #define DRV_NAME "vrf"
43 #define DRV_VERSION "1.0"
45 #define vrf_master_get_rcu(dev) \
46 ((struct net_device *)rcu_dereference(dev->rx_handler_data))
60 struct u64_stats_sync syncp;
63 static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie)
68 static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
70 return ip_local_out(net, sk, skb);
73 static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
75 /* TO-DO: return max ethernet size? */
79 static void vrf_dst_destroy(struct dst_entry *dst)
81 /* our dst lives forever - or until the device is closed */
84 static unsigned int vrf_default_advmss(const struct dst_entry *dst)
89 static struct dst_ops vrf_dst_ops = {
91 .local_out = vrf_ip_local_out,
92 .check = vrf_ip_check,
94 .destroy = vrf_dst_destroy,
95 .default_advmss = vrf_default_advmss,
98 /* neighbor handling is done with actual device; do not want
99 * to flip skb->dev for those ndisc packets. This really fails
100 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
103 #if IS_ENABLED(CONFIG_IPV6)
104 static bool check_ipv6_frame(const struct sk_buff *skb)
106 const struct ipv6hdr *ipv6h;
107 struct ipv6hdr _ipv6h;
110 ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h);
114 if (ipv6h->nexthdr == NEXTHDR_ICMP) {
115 const struct icmp6hdr *icmph;
116 struct icmp6hdr _icmph;
118 icmph = skb_header_pointer(skb, sizeof(_ipv6h),
119 sizeof(_icmph), &_icmph);
123 switch (icmph->icmp6_type) {
124 case NDISC_ROUTER_SOLICITATION:
125 case NDISC_ROUTER_ADVERTISEMENT:
126 case NDISC_NEIGHBOUR_SOLICITATION:
127 case NDISC_NEIGHBOUR_ADVERTISEMENT:
138 static bool check_ipv6_frame(const struct sk_buff *skb)
144 static bool is_ip_rx_frame(struct sk_buff *skb)
146 switch (skb->protocol) {
147 case htons(ETH_P_IP):
149 case htons(ETH_P_IPV6):
150 return check_ipv6_frame(skb);
155 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
157 vrf_dev->stats.tx_errors++;
161 /* note: already called with rcu_read_lock */
162 static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb)
164 struct sk_buff *skb = *pskb;
166 if (is_ip_rx_frame(skb)) {
167 struct net_device *dev = vrf_master_get_rcu(skb->dev);
168 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
170 u64_stats_update_begin(&dstats->syncp);
172 dstats->rx_bytes += skb->len;
173 u64_stats_update_end(&dstats->syncp);
177 return RX_HANDLER_ANOTHER;
179 return RX_HANDLER_PASS;
182 static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
183 struct rtnl_link_stats64 *stats)
187 for_each_possible_cpu(i) {
188 const struct pcpu_dstats *dstats;
189 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
192 dstats = per_cpu_ptr(dev->dstats, i);
194 start = u64_stats_fetch_begin_irq(&dstats->syncp);
195 tbytes = dstats->tx_bytes;
196 tpkts = dstats->tx_pkts;
197 tdrops = dstats->tx_drps;
198 rbytes = dstats->rx_bytes;
199 rpkts = dstats->rx_pkts;
200 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
201 stats->tx_bytes += tbytes;
202 stats->tx_packets += tpkts;
203 stats->tx_dropped += tdrops;
204 stats->rx_bytes += rbytes;
205 stats->rx_packets += rpkts;
210 #if IS_ENABLED(CONFIG_IPV6)
211 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
212 struct net_device *dev)
214 const struct ipv6hdr *iph = ipv6_hdr(skb);
215 struct net *net = dev_net(skb->dev);
216 struct flowi6 fl6 = {
217 /* needed to match OIF rule */
218 .flowi6_oif = dev->ifindex,
219 .flowi6_iif = LOOPBACK_IFINDEX,
222 .flowlabel = ip6_flowinfo(iph),
223 .flowi6_mark = skb->mark,
224 .flowi6_proto = iph->nexthdr,
225 .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
227 int ret = NET_XMIT_DROP;
228 struct dst_entry *dst;
229 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
231 dst = ip6_route_output(net, NULL, &fl6);
236 skb_dst_set(skb, dst);
238 ret = ip6_local_out(net, skb->sk, skb);
239 if (unlikely(net_xmit_eval(ret)))
240 dev->stats.tx_errors++;
242 ret = NET_XMIT_SUCCESS;
246 vrf_tx_error(dev, skb);
247 return NET_XMIT_DROP;
250 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
251 struct net_device *dev)
253 vrf_tx_error(dev, skb);
254 return NET_XMIT_DROP;
258 static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
259 struct net_device *vrf_dev)
264 rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
268 /* TO-DO: what about broadcast ? */
269 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
275 skb_dst_set(skb, &rt->dst);
281 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
282 struct net_device *vrf_dev)
284 struct iphdr *ip4h = ip_hdr(skb);
285 int ret = NET_XMIT_DROP;
286 struct flowi4 fl4 = {
287 /* needed to match OIF rule */
288 .flowi4_oif = vrf_dev->ifindex,
289 .flowi4_iif = LOOPBACK_IFINDEX,
290 .flowi4_tos = RT_TOS(ip4h->tos),
291 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
292 FLOWI_FLAG_SKIP_NH_OIF,
293 .daddr = ip4h->daddr,
296 if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
300 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
304 ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
305 if (unlikely(net_xmit_eval(ret)))
306 vrf_dev->stats.tx_errors++;
308 ret = NET_XMIT_SUCCESS;
313 vrf_tx_error(vrf_dev, skb);
317 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
319 /* strip the ethernet header added for pass through VRF device */
320 __skb_pull(skb, skb_network_offset(skb));
322 switch (skb->protocol) {
323 case htons(ETH_P_IP):
324 return vrf_process_v4_outbound(skb, dev);
325 case htons(ETH_P_IPV6):
326 return vrf_process_v6_outbound(skb, dev);
328 vrf_tx_error(dev, skb);
329 return NET_XMIT_DROP;
333 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
335 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
337 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
338 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
340 u64_stats_update_begin(&dstats->syncp);
342 dstats->tx_bytes += skb->len;
343 u64_stats_update_end(&dstats->syncp);
345 this_cpu_inc(dev->dstats->tx_drps);
351 #if IS_ENABLED(CONFIG_IPV6)
352 static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie)
357 static struct dst_ops vrf_dst_ops6 = {
359 .local_out = ip6_local_out,
360 .check = vrf_ip6_check,
362 .destroy = vrf_dst_destroy,
363 .default_advmss = vrf_default_advmss,
366 static int init_dst_ops6_kmem_cachep(void)
368 vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache",
369 sizeof(struct rt6_info),
374 if (!vrf_dst_ops6.kmem_cachep)
380 static void free_dst_ops6_kmem_cachep(void)
382 kmem_cache_destroy(vrf_dst_ops6.kmem_cachep);
385 static int vrf_input6(struct sk_buff *skb)
387 skb->dev->stats.rx_errors++;
392 /* modelled after ip6_finish_output2 */
393 static int vrf_finish_output6(struct net *net, struct sock *sk,
396 struct dst_entry *dst = skb_dst(skb);
397 struct net_device *dev = dst->dev;
398 struct neighbour *neigh;
399 struct in6_addr *nexthop;
402 skb->protocol = htons(ETH_P_IPV6);
406 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
407 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
408 if (unlikely(!neigh))
409 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
410 if (!IS_ERR(neigh)) {
411 ret = dst_neigh_output(dst, neigh, skb);
412 rcu_read_unlock_bh();
415 rcu_read_unlock_bh();
417 IP6_INC_STATS(dev_net(dst->dev),
418 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
423 /* modelled after ip6_output */
424 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
426 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
427 net, sk, skb, NULL, skb_dst(skb)->dev,
429 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
432 static void vrf_rt6_destroy(struct net_vrf *vrf)
434 dst_destroy(&vrf->rt6->dst);
435 free_percpu(vrf->rt6->rt6i_pcpu);
439 static int vrf_rt6_create(struct net_device *dev)
441 struct net_vrf *vrf = netdev_priv(dev);
442 struct dst_entry *dst;
443 struct rt6_info *rt6;
447 rt6 = dst_alloc(&vrf_dst_ops6, dev, 0,
449 (DST_HOST | DST_NOPOLICY | DST_NOXFRM));
455 rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL);
456 if (!rt6->rt6i_pcpu) {
460 for_each_possible_cpu(cpu) {
461 struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu);
465 memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst));
467 INIT_LIST_HEAD(&rt6->rt6i_siblings);
468 INIT_LIST_HEAD(&rt6->rt6i_uncached);
470 rt6->dst.input = vrf_input6;
471 rt6->dst.output = vrf_output6;
473 rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id);
475 atomic_set(&rt6->dst.__refcnt, 2);
483 static int init_dst_ops6_kmem_cachep(void)
488 static void free_dst_ops6_kmem_cachep(void)
492 static void vrf_rt6_destroy(struct net_vrf *vrf)
496 static int vrf_rt6_create(struct net_device *dev)
502 /* modelled after ip_finish_output2 */
503 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
505 struct dst_entry *dst = skb_dst(skb);
506 struct rtable *rt = (struct rtable *)dst;
507 struct net_device *dev = dst->dev;
508 unsigned int hh_len = LL_RESERVED_SPACE(dev);
509 struct neighbour *neigh;
513 /* Be paranoid, rather than too clever. */
514 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
515 struct sk_buff *skb2;
517 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
523 skb_set_owner_w(skb2, skb->sk);
531 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
532 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
533 if (unlikely(!neigh))
534 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
536 ret = dst_neigh_output(dst, neigh, skb);
538 rcu_read_unlock_bh();
540 if (unlikely(ret < 0))
541 vrf_tx_error(skb->dev, skb);
545 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
547 struct net_device *dev = skb_dst(skb)->dev;
549 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
552 skb->protocol = htons(ETH_P_IP);
554 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
555 net, sk, skb, NULL, dev,
557 !(IPCB(skb)->flags & IPSKB_REROUTED));
560 static void vrf_rtable_destroy(struct net_vrf *vrf)
562 struct dst_entry *dst = (struct dst_entry *)vrf->rth;
568 static struct rtable *vrf_rtable_create(struct net_device *dev)
570 struct net_vrf *vrf = netdev_priv(dev);
573 rth = dst_alloc(&vrf_dst_ops, dev, 2,
575 (DST_HOST | DST_NOPOLICY | DST_NOXFRM));
577 rth->dst.output = vrf_output;
578 rth->rt_genid = rt_genid_ipv4(dev_net(dev));
580 rth->rt_type = RTN_UNICAST;
581 rth->rt_is_input = 0;
585 rth->rt_uses_gateway = 0;
586 rth->rt_table_id = vrf->tb_id;
587 INIT_LIST_HEAD(&rth->rt_uncached);
588 rth->rt_uncached_list = NULL;
594 /**************************** device handling ********************/
596 /* cycle interface to flush neighbor cache and move routes across tables */
597 static void cycle_netdev(struct net_device *dev)
599 unsigned int flags = dev->flags;
602 if (!netif_running(dev))
605 ret = dev_change_flags(dev, flags & ~IFF_UP);
607 ret = dev_change_flags(dev, flags);
611 "Failed to cycle device %s; route tables might be wrong!\n",
616 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
620 /* register the packet handler for slave ports */
621 ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
624 "Device %s failed to register rx_handler\n",
629 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
633 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
634 cycle_netdev(port_dev);
639 netdev_rx_handler_unregister(port_dev);
644 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
646 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
649 return do_vrf_add_slave(dev, port_dev);
652 /* inverse of do_vrf_add_slave */
653 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
655 netdev_upper_dev_unlink(port_dev, dev);
656 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
658 netdev_rx_handler_unregister(port_dev);
660 cycle_netdev(port_dev);
665 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
667 return do_vrf_del_slave(dev, port_dev);
670 static void vrf_dev_uninit(struct net_device *dev)
672 struct net_vrf *vrf = netdev_priv(dev);
673 struct net_device *port_dev;
674 struct list_head *iter;
676 vrf_rtable_destroy(vrf);
677 vrf_rt6_destroy(vrf);
679 netdev_for_each_lower_dev(dev, port_dev, iter)
680 vrf_del_slave(dev, port_dev);
682 free_percpu(dev->dstats);
686 static int vrf_dev_init(struct net_device *dev)
688 struct net_vrf *vrf = netdev_priv(dev);
690 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
694 /* create the default dst which points back to us */
695 vrf->rth = vrf_rtable_create(dev);
699 if (vrf_rt6_create(dev) != 0)
702 dev->flags = IFF_MASTER | IFF_NOARP;
707 vrf_rtable_destroy(vrf);
709 free_percpu(dev->dstats);
715 static const struct net_device_ops vrf_netdev_ops = {
716 .ndo_init = vrf_dev_init,
717 .ndo_uninit = vrf_dev_uninit,
718 .ndo_start_xmit = vrf_xmit,
719 .ndo_get_stats64 = vrf_get_stats64,
720 .ndo_add_slave = vrf_add_slave,
721 .ndo_del_slave = vrf_del_slave,
724 static u32 vrf_fib_table(const struct net_device *dev)
726 struct net_vrf *vrf = netdev_priv(dev);
731 static struct rtable *vrf_get_rtable(const struct net_device *dev,
732 const struct flowi4 *fl4)
734 struct rtable *rth = NULL;
736 if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
737 struct net_vrf *vrf = netdev_priv(dev);
740 atomic_inc(&rth->dst.__refcnt);
746 /* called under rcu_read_lock */
747 static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
749 struct fib_result res = { .tclassid = 0 };
750 struct net *net = dev_net(dev);
751 u32 orig_tos = fl4->flowi4_tos;
752 u8 flags = fl4->flowi4_flags;
753 u8 scope = fl4->flowi4_scope;
754 u8 tos = RT_FL_TOS(fl4);
757 if (unlikely(!fl4->daddr))
760 fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
761 fl4->flowi4_iif = LOOPBACK_IFINDEX;
762 fl4->flowi4_tos = tos & IPTOS_RT_MASK;
763 fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
764 RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
766 rc = fib_lookup(net, fl4, &res, 0);
768 if (res.type == RTN_LOCAL)
769 fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
771 fib_select_path(net, &res, fl4, -1);
774 fl4->flowi4_flags = flags;
775 fl4->flowi4_tos = orig_tos;
776 fl4->flowi4_scope = scope;
781 #if IS_ENABLED(CONFIG_IPV6)
782 static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
783 const struct flowi6 *fl6)
785 struct rt6_info *rt = NULL;
787 if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
788 struct net_vrf *vrf = netdev_priv(dev);
791 atomic_inc(&rt->dst.__refcnt);
794 return (struct dst_entry *)rt;
798 static const struct l3mdev_ops vrf_l3mdev_ops = {
799 .l3mdev_fib_table = vrf_fib_table,
800 .l3mdev_get_rtable = vrf_get_rtable,
801 .l3mdev_get_saddr = vrf_get_saddr,
802 #if IS_ENABLED(CONFIG_IPV6)
803 .l3mdev_get_rt6_dst = vrf_get_rt6_dst,
807 static void vrf_get_drvinfo(struct net_device *dev,
808 struct ethtool_drvinfo *info)
810 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
811 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
814 static const struct ethtool_ops vrf_ethtool_ops = {
815 .get_drvinfo = vrf_get_drvinfo,
818 static void vrf_setup(struct net_device *dev)
822 /* Initialize the device structure. */
823 dev->netdev_ops = &vrf_netdev_ops;
824 dev->l3mdev_ops = &vrf_l3mdev_ops;
825 dev->ethtool_ops = &vrf_ethtool_ops;
826 dev->destructor = free_netdev;
828 /* Fill in device structure with ethernet-generic values. */
829 eth_hw_addr_random(dev);
831 /* don't acquire vrf device's netif_tx_lock when transmitting */
832 dev->features |= NETIF_F_LLTX;
834 /* don't allow vrf devices to change network namespaces. */
835 dev->features |= NETIF_F_NETNS_LOCAL;
838 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
840 if (tb[IFLA_ADDRESS]) {
841 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
843 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
844 return -EADDRNOTAVAIL;
849 static void vrf_dellink(struct net_device *dev, struct list_head *head)
851 unregister_netdevice_queue(dev, head);
854 static int vrf_newlink(struct net *src_net, struct net_device *dev,
855 struct nlattr *tb[], struct nlattr *data[])
857 struct net_vrf *vrf = netdev_priv(dev);
859 if (!data || !data[IFLA_VRF_TABLE])
862 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
864 dev->priv_flags |= IFF_L3MDEV_MASTER;
866 return register_netdevice(dev);
869 static size_t vrf_nl_getsize(const struct net_device *dev)
871 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
874 static int vrf_fillinfo(struct sk_buff *skb,
875 const struct net_device *dev)
877 struct net_vrf *vrf = netdev_priv(dev);
879 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
882 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
883 const struct net_device *slave_dev)
885 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
888 static int vrf_fill_slave_info(struct sk_buff *skb,
889 const struct net_device *vrf_dev,
890 const struct net_device *slave_dev)
892 struct net_vrf *vrf = netdev_priv(vrf_dev);
894 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
900 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
901 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
904 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
906 .priv_size = sizeof(struct net_vrf),
908 .get_size = vrf_nl_getsize,
909 .policy = vrf_nl_policy,
910 .validate = vrf_validate,
911 .fill_info = vrf_fillinfo,
913 .get_slave_size = vrf_get_slave_size,
914 .fill_slave_info = vrf_fill_slave_info,
916 .newlink = vrf_newlink,
917 .dellink = vrf_dellink,
919 .maxtype = IFLA_VRF_MAX,
922 static int vrf_device_event(struct notifier_block *unused,
923 unsigned long event, void *ptr)
925 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
927 /* only care about unregister events to drop slave references */
928 if (event == NETDEV_UNREGISTER) {
929 struct net_device *vrf_dev;
931 if (!netif_is_l3_slave(dev))
934 vrf_dev = netdev_master_upper_dev_get(dev);
935 vrf_del_slave(vrf_dev, dev);
941 static struct notifier_block vrf_notifier_block __read_mostly = {
942 .notifier_call = vrf_device_event,
945 static int __init vrf_init_module(void)
949 vrf_dst_ops.kmem_cachep =
950 kmem_cache_create("vrf_ip_dst_cache",
951 sizeof(struct rtable), 0,
955 if (!vrf_dst_ops.kmem_cachep)
958 rc = init_dst_ops6_kmem_cachep();
962 register_netdevice_notifier(&vrf_notifier_block);
964 rc = rtnl_link_register(&vrf_link_ops);
971 unregister_netdevice_notifier(&vrf_notifier_block);
972 free_dst_ops6_kmem_cachep();
974 kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
978 static void __exit vrf_cleanup_module(void)
980 rtnl_link_unregister(&vrf_link_ops);
981 unregister_netdevice_notifier(&vrf_notifier_block);
982 kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
983 free_dst_ops6_kmem_cachep();
986 module_init(vrf_init_module);
987 module_exit(vrf_cleanup_module);
988 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
989 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
990 MODULE_LICENSE("GPL");
991 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
992 MODULE_VERSION(DRV_VERSION);