2 * vrf.c: device driver to encapsulate a VRF space
4 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
8 * Based on dummy, team and ipvlan drivers
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
21 #include <linux/init.h>
22 #include <linux/moduleparam.h>
23 #include <linux/netfilter.h>
24 #include <linux/rtnetlink.h>
25 #include <net/rtnetlink.h>
26 #include <linux/u64_stats_sync.h>
27 #include <linux/hashtable.h>
29 #include <linux/inetdevice.h>
32 #include <net/ip_fib.h>
33 #include <net/ip6_fib.h>
34 #include <net/ip6_route.h>
35 #include <net/route.h>
36 #include <net/addrconf.h>
37 #include <net/l3mdev.h>
38 #include <net/fib_rules.h>
40 #define DRV_NAME "vrf"
41 #define DRV_VERSION "1.0"
43 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */
44 static bool add_fib_rules
= true;
47 struct rtable __rcu
*rth
;
48 struct rtable __rcu
*rth_local
;
49 struct rt6_info __rcu
*rt6
;
50 struct rt6_info __rcu
*rt6_local
;
61 struct u64_stats_sync syncp
;
64 static void vrf_rx_stats(struct net_device
*dev
, int len
)
66 struct pcpu_dstats
*dstats
= this_cpu_ptr(dev
->dstats
);
68 u64_stats_update_begin(&dstats
->syncp
);
70 dstats
->rx_bytes
+= len
;
71 u64_stats_update_end(&dstats
->syncp
);
74 static void vrf_tx_error(struct net_device
*vrf_dev
, struct sk_buff
*skb
)
76 vrf_dev
->stats
.tx_errors
++;
80 static struct rtnl_link_stats64
*vrf_get_stats64(struct net_device
*dev
,
81 struct rtnl_link_stats64
*stats
)
85 for_each_possible_cpu(i
) {
86 const struct pcpu_dstats
*dstats
;
87 u64 tbytes
, tpkts
, tdrops
, rbytes
, rpkts
;
90 dstats
= per_cpu_ptr(dev
->dstats
, i
);
92 start
= u64_stats_fetch_begin_irq(&dstats
->syncp
);
93 tbytes
= dstats
->tx_bytes
;
94 tpkts
= dstats
->tx_pkts
;
95 tdrops
= dstats
->tx_drps
;
96 rbytes
= dstats
->rx_bytes
;
97 rpkts
= dstats
->rx_pkts
;
98 } while (u64_stats_fetch_retry_irq(&dstats
->syncp
, start
));
99 stats
->tx_bytes
+= tbytes
;
100 stats
->tx_packets
+= tpkts
;
101 stats
->tx_dropped
+= tdrops
;
102 stats
->rx_bytes
+= rbytes
;
103 stats
->rx_packets
+= rpkts
;
108 /* Local traffic destined to local address. Reinsert the packet to rx
109 * path, similar to loopback handling.
111 static int vrf_local_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
112 struct dst_entry
*dst
)
118 skb_dst_set(skb
, dst
);
121 /* set pkt_type to avoid skb hitting packet taps twice -
122 * once on Tx and again in Rx processing
124 skb
->pkt_type
= PACKET_LOOPBACK
;
126 skb
->protocol
= eth_type_trans(skb
, dev
);
128 if (likely(netif_rx(skb
) == NET_RX_SUCCESS
))
129 vrf_rx_stats(dev
, len
);
131 this_cpu_inc(dev
->dstats
->rx_drps
);
136 #if IS_ENABLED(CONFIG_IPV6)
137 static int vrf_ip6_local_out(struct net
*net
, struct sock
*sk
,
142 err
= nf_hook(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, net
,
143 sk
, skb
, NULL
, skb_dst(skb
)->dev
, dst_output
);
145 if (likely(err
== 1))
146 err
= dst_output(net
, sk
, skb
);
151 static netdev_tx_t
vrf_process_v6_outbound(struct sk_buff
*skb
,
152 struct net_device
*dev
)
154 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
155 struct net
*net
= dev_net(skb
->dev
);
156 struct flowi6 fl6
= {
157 /* needed to match OIF rule */
158 .flowi6_oif
= dev
->ifindex
,
159 .flowi6_iif
= LOOPBACK_IFINDEX
,
162 .flowlabel
= ip6_flowinfo(iph
),
163 .flowi6_mark
= skb
->mark
,
164 .flowi6_proto
= iph
->nexthdr
,
165 .flowi6_flags
= FLOWI_FLAG_SKIP_NH_OIF
,
167 int ret
= NET_XMIT_DROP
;
168 struct dst_entry
*dst
;
169 struct dst_entry
*dst_null
= &net
->ipv6
.ip6_null_entry
->dst
;
171 dst
= ip6_route_output(net
, NULL
, &fl6
);
177 /* if dst.dev is loopback or the VRF device again this is locally
178 * originated traffic destined to a local address. Short circuit
179 * to Rx path using our local dst
181 if (dst
->dev
== net
->loopback_dev
|| dst
->dev
== dev
) {
182 struct net_vrf
*vrf
= netdev_priv(dev
);
183 struct rt6_info
*rt6_local
;
185 /* release looked up dst and use cached local dst */
190 rt6_local
= rcu_dereference(vrf
->rt6_local
);
191 if (unlikely(!rt6_local
)) {
196 /* Ordering issue: cached local dst is created on newlink
197 * before the IPv6 initialization. Using the local dst
198 * requires rt6i_idev to be set so make sure it is.
200 if (unlikely(!rt6_local
->rt6i_idev
)) {
201 rt6_local
->rt6i_idev
= in6_dev_get(dev
);
202 if (!rt6_local
->rt6i_idev
) {
208 dst
= &rt6_local
->dst
;
213 return vrf_local_xmit(skb
, dev
, &rt6_local
->dst
);
216 skb_dst_set(skb
, dst
);
218 /* strip the ethernet header added for pass through VRF device */
219 __skb_pull(skb
, skb_network_offset(skb
));
221 ret
= vrf_ip6_local_out(net
, skb
->sk
, skb
);
222 if (unlikely(net_xmit_eval(ret
)))
223 dev
->stats
.tx_errors
++;
225 ret
= NET_XMIT_SUCCESS
;
229 vrf_tx_error(dev
, skb
);
230 return NET_XMIT_DROP
;
233 static netdev_tx_t
vrf_process_v6_outbound(struct sk_buff
*skb
,
234 struct net_device
*dev
)
236 vrf_tx_error(dev
, skb
);
237 return NET_XMIT_DROP
;
241 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
242 static int vrf_ip_local_out(struct net
*net
, struct sock
*sk
,
247 err
= nf_hook(NFPROTO_IPV4
, NF_INET_LOCAL_OUT
, net
, sk
,
248 skb
, NULL
, skb_dst(skb
)->dev
, dst_output
);
249 if (likely(err
== 1))
250 err
= dst_output(net
, sk
, skb
);
255 static netdev_tx_t
vrf_process_v4_outbound(struct sk_buff
*skb
,
256 struct net_device
*vrf_dev
)
258 struct iphdr
*ip4h
= ip_hdr(skb
);
259 int ret
= NET_XMIT_DROP
;
260 struct flowi4 fl4
= {
261 /* needed to match OIF rule */
262 .flowi4_oif
= vrf_dev
->ifindex
,
263 .flowi4_iif
= LOOPBACK_IFINDEX
,
264 .flowi4_tos
= RT_TOS(ip4h
->tos
),
265 .flowi4_flags
= FLOWI_FLAG_ANYSRC
| FLOWI_FLAG_SKIP_NH_OIF
,
266 .daddr
= ip4h
->daddr
,
268 struct net
*net
= dev_net(vrf_dev
);
271 rt
= ip_route_output_flow(net
, &fl4
, NULL
);
277 /* if dst.dev is loopback or the VRF device again this is locally
278 * originated traffic destined to a local address. Short circuit
279 * to Rx path using our local dst
281 if (rt
->dst
.dev
== net
->loopback_dev
|| rt
->dst
.dev
== vrf_dev
) {
282 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
283 struct rtable
*rth_local
;
284 struct dst_entry
*dst
= NULL
;
290 rth_local
= rcu_dereference(vrf
->rth_local
);
291 if (likely(rth_local
)) {
292 dst
= &rth_local
->dst
;
301 return vrf_local_xmit(skb
, vrf_dev
, dst
);
304 skb_dst_set(skb
, &rt
->dst
);
306 /* strip the ethernet header added for pass through VRF device */
307 __skb_pull(skb
, skb_network_offset(skb
));
310 ip4h
->saddr
= inet_select_addr(skb_dst(skb
)->dev
, 0,
314 ret
= vrf_ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
315 if (unlikely(net_xmit_eval(ret
)))
316 vrf_dev
->stats
.tx_errors
++;
318 ret
= NET_XMIT_SUCCESS
;
323 vrf_tx_error(vrf_dev
, skb
);
327 static netdev_tx_t
is_ip_tx_frame(struct sk_buff
*skb
, struct net_device
*dev
)
329 switch (skb
->protocol
) {
330 case htons(ETH_P_IP
):
331 return vrf_process_v4_outbound(skb
, dev
);
332 case htons(ETH_P_IPV6
):
333 return vrf_process_v6_outbound(skb
, dev
);
335 vrf_tx_error(dev
, skb
);
336 return NET_XMIT_DROP
;
340 static netdev_tx_t
vrf_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
342 netdev_tx_t ret
= is_ip_tx_frame(skb
, dev
);
344 if (likely(ret
== NET_XMIT_SUCCESS
|| ret
== NET_XMIT_CN
)) {
345 struct pcpu_dstats
*dstats
= this_cpu_ptr(dev
->dstats
);
347 u64_stats_update_begin(&dstats
->syncp
);
349 dstats
->tx_bytes
+= skb
->len
;
350 u64_stats_update_end(&dstats
->syncp
);
352 this_cpu_inc(dev
->dstats
->tx_drps
);
358 #if IS_ENABLED(CONFIG_IPV6)
359 /* modelled after ip6_finish_output2 */
360 static int vrf_finish_output6(struct net
*net
, struct sock
*sk
,
363 struct dst_entry
*dst
= skb_dst(skb
);
364 struct net_device
*dev
= dst
->dev
;
365 struct neighbour
*neigh
;
366 struct in6_addr
*nexthop
;
371 skb
->protocol
= htons(ETH_P_IPV6
);
375 nexthop
= rt6_nexthop((struct rt6_info
*)dst
, &ipv6_hdr(skb
)->daddr
);
376 neigh
= __ipv6_neigh_lookup_noref(dst
->dev
, nexthop
);
377 if (unlikely(!neigh
))
378 neigh
= __neigh_create(&nd_tbl
, nexthop
, dst
->dev
, false);
379 if (!IS_ERR(neigh
)) {
380 ret
= dst_neigh_output(dst
, neigh
, skb
);
381 rcu_read_unlock_bh();
384 rcu_read_unlock_bh();
386 IP6_INC_STATS(dev_net(dst
->dev
),
387 ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
392 /* modelled after ip6_output */
393 static int vrf_output6(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
395 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
396 net
, sk
, skb
, NULL
, skb_dst(skb
)->dev
,
398 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
401 /* set dst on skb to send packet to us via dev_xmit path. Allows
402 * packet to go through device based features such as qdisc, netfilter
403 * hooks and packet sockets with skb->dev set to vrf device.
405 static struct sk_buff
*vrf_ip6_out(struct net_device
*vrf_dev
,
409 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
410 struct dst_entry
*dst
= NULL
;
411 struct rt6_info
*rt6
;
413 /* don't divert link scope packets */
414 if (rt6_need_strict(&ipv6_hdr(skb
)->daddr
))
419 rt6
= rcu_dereference(vrf
->rt6
);
427 if (unlikely(!dst
)) {
428 vrf_tx_error(vrf_dev
, skb
);
433 skb_dst_set(skb
, dst
);
439 static void vrf_rt6_release(struct net_device
*dev
, struct net_vrf
*vrf
)
441 struct rt6_info
*rt6
= rtnl_dereference(vrf
->rt6
);
442 struct rt6_info
*rt6_local
= rtnl_dereference(vrf
->rt6_local
);
443 struct net
*net
= dev_net(dev
);
444 struct dst_entry
*dst
;
446 RCU_INIT_POINTER(vrf
->rt6
, NULL
);
447 RCU_INIT_POINTER(vrf
->rt6_local
, NULL
);
450 /* move dev in dst's to loopback so this VRF device can be deleted
451 * - based on dst_ifdown
456 dst
->dev
= net
->loopback_dev
;
462 if (rt6_local
->rt6i_idev
)
463 in6_dev_put(rt6_local
->rt6i_idev
);
465 dst
= &rt6_local
->dst
;
467 dst
->dev
= net
->loopback_dev
;
473 static int vrf_rt6_create(struct net_device
*dev
)
475 int flags
= DST_HOST
| DST_NOPOLICY
| DST_NOXFRM
| DST_NOCACHE
;
476 struct net_vrf
*vrf
= netdev_priv(dev
);
477 struct net
*net
= dev_net(dev
);
478 struct fib6_table
*rt6i_table
;
479 struct rt6_info
*rt6
, *rt6_local
;
482 /* IPv6 can be CONFIG enabled and then disabled runtime */
483 if (!ipv6_mod_enabled())
486 rt6i_table
= fib6_new_table(net
, vrf
->tb_id
);
490 /* create a dst for routing packets out a VRF device */
491 rt6
= ip6_dst_alloc(net
, dev
, flags
);
497 rt6
->rt6i_table
= rt6i_table
;
498 rt6
->dst
.output
= vrf_output6
;
500 /* create a dst for local routing - packets sent locally
501 * to local address via the VRF device as a loopback
503 rt6_local
= ip6_dst_alloc(net
, dev
, flags
);
505 dst_release(&rt6
->dst
);
509 dst_hold(&rt6_local
->dst
);
511 rt6_local
->rt6i_idev
= in6_dev_get(dev
);
512 rt6_local
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
| RTF_LOCAL
;
513 rt6_local
->rt6i_table
= rt6i_table
;
514 rt6_local
->dst
.input
= ip6_input
;
516 rcu_assign_pointer(vrf
->rt6
, rt6
);
517 rcu_assign_pointer(vrf
->rt6_local
, rt6_local
);
524 static struct sk_buff
*vrf_ip6_out(struct net_device
*vrf_dev
,
531 static void vrf_rt6_release(struct net_device
*dev
, struct net_vrf
*vrf
)
535 static int vrf_rt6_create(struct net_device
*dev
)
541 /* modelled after ip_finish_output2 */
542 static int vrf_finish_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
544 struct dst_entry
*dst
= skb_dst(skb
);
545 struct rtable
*rt
= (struct rtable
*)dst
;
546 struct net_device
*dev
= dst
->dev
;
547 unsigned int hh_len
= LL_RESERVED_SPACE(dev
);
548 struct neighbour
*neigh
;
554 /* Be paranoid, rather than too clever. */
555 if (unlikely(skb_headroom(skb
) < hh_len
&& dev
->header_ops
)) {
556 struct sk_buff
*skb2
;
558 skb2
= skb_realloc_headroom(skb
, LL_RESERVED_SPACE(dev
));
564 skb_set_owner_w(skb2
, skb
->sk
);
572 nexthop
= (__force u32
)rt_nexthop(rt
, ip_hdr(skb
)->daddr
);
573 neigh
= __ipv4_neigh_lookup_noref(dev
, nexthop
);
574 if (unlikely(!neigh
))
575 neigh
= __neigh_create(&arp_tbl
, &nexthop
, dev
, false);
577 ret
= dst_neigh_output(dst
, neigh
, skb
);
579 rcu_read_unlock_bh();
581 if (unlikely(ret
< 0))
582 vrf_tx_error(skb
->dev
, skb
);
586 static int vrf_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
588 struct net_device
*dev
= skb_dst(skb
)->dev
;
590 IP_UPD_PO_STATS(net
, IPSTATS_MIB_OUT
, skb
->len
);
593 skb
->protocol
= htons(ETH_P_IP
);
595 return NF_HOOK_COND(NFPROTO_IPV4
, NF_INET_POST_ROUTING
,
596 net
, sk
, skb
, NULL
, dev
,
598 !(IPCB(skb
)->flags
& IPSKB_REROUTED
));
601 /* set dst on skb to send packet to us via dev_xmit path. Allows
602 * packet to go through device based features such as qdisc, netfilter
603 * hooks and packet sockets with skb->dev set to vrf device.
605 static struct sk_buff
*vrf_ip_out(struct net_device
*vrf_dev
,
609 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
610 struct dst_entry
*dst
= NULL
;
613 /* don't divert multicast */
614 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
619 rth
= rcu_dereference(vrf
->rth
);
627 if (unlikely(!dst
)) {
628 vrf_tx_error(vrf_dev
, skb
);
633 skb_dst_set(skb
, dst
);
638 /* called with rcu lock held */
639 static struct sk_buff
*vrf_l3_out(struct net_device
*vrf_dev
,
646 return vrf_ip_out(vrf_dev
, sk
, skb
);
648 return vrf_ip6_out(vrf_dev
, sk
, skb
);
655 static void vrf_rtable_release(struct net_device
*dev
, struct net_vrf
*vrf
)
657 struct rtable
*rth
= rtnl_dereference(vrf
->rth
);
658 struct rtable
*rth_local
= rtnl_dereference(vrf
->rth_local
);
659 struct net
*net
= dev_net(dev
);
660 struct dst_entry
*dst
;
662 RCU_INIT_POINTER(vrf
->rth
, NULL
);
663 RCU_INIT_POINTER(vrf
->rth_local
, NULL
);
666 /* move dev in dst's to loopback so this VRF device can be deleted
667 * - based on dst_ifdown
672 dst
->dev
= net
->loopback_dev
;
678 dst
= &rth_local
->dst
;
680 dst
->dev
= net
->loopback_dev
;
686 static int vrf_rtable_create(struct net_device
*dev
)
688 struct net_vrf
*vrf
= netdev_priv(dev
);
689 struct rtable
*rth
, *rth_local
;
691 if (!fib_new_table(dev_net(dev
), vrf
->tb_id
))
694 /* create a dst for routing packets out through a VRF device */
695 rth
= rt_dst_alloc(dev
, 0, RTN_UNICAST
, 1, 1, 0);
699 /* create a dst for local ingress routing - packets sent locally
700 * to local address via the VRF device as a loopback
702 rth_local
= rt_dst_alloc(dev
, RTCF_LOCAL
, RTN_LOCAL
, 1, 1, 0);
704 dst_release(&rth
->dst
);
708 rth
->dst
.output
= vrf_output
;
709 rth
->rt_table_id
= vrf
->tb_id
;
711 rth_local
->rt_table_id
= vrf
->tb_id
;
713 rcu_assign_pointer(vrf
->rth
, rth
);
714 rcu_assign_pointer(vrf
->rth_local
, rth_local
);
719 /**************************** device handling ********************/
721 /* cycle interface to flush neighbor cache and move routes across tables */
722 static void cycle_netdev(struct net_device
*dev
)
724 unsigned int flags
= dev
->flags
;
727 if (!netif_running(dev
))
730 ret
= dev_change_flags(dev
, flags
& ~IFF_UP
);
732 ret
= dev_change_flags(dev
, flags
);
736 "Failed to cycle device %s; route tables might be wrong!\n",
741 static int do_vrf_add_slave(struct net_device
*dev
, struct net_device
*port_dev
)
745 ret
= netdev_master_upper_dev_link(port_dev
, dev
, NULL
, NULL
);
749 port_dev
->priv_flags
|= IFF_L3MDEV_SLAVE
;
750 cycle_netdev(port_dev
);
755 static int vrf_add_slave(struct net_device
*dev
, struct net_device
*port_dev
)
757 if (netif_is_l3_master(port_dev
) || netif_is_l3_slave(port_dev
))
760 return do_vrf_add_slave(dev
, port_dev
);
763 /* inverse of do_vrf_add_slave */
764 static int do_vrf_del_slave(struct net_device
*dev
, struct net_device
*port_dev
)
766 netdev_upper_dev_unlink(port_dev
, dev
);
767 port_dev
->priv_flags
&= ~IFF_L3MDEV_SLAVE
;
769 cycle_netdev(port_dev
);
774 static int vrf_del_slave(struct net_device
*dev
, struct net_device
*port_dev
)
776 return do_vrf_del_slave(dev
, port_dev
);
779 static void vrf_dev_uninit(struct net_device
*dev
)
781 struct net_vrf
*vrf
= netdev_priv(dev
);
782 struct net_device
*port_dev
;
783 struct list_head
*iter
;
785 vrf_rtable_release(dev
, vrf
);
786 vrf_rt6_release(dev
, vrf
);
788 netdev_for_each_lower_dev(dev
, port_dev
, iter
)
789 vrf_del_slave(dev
, port_dev
);
791 free_percpu(dev
->dstats
);
795 static int vrf_dev_init(struct net_device
*dev
)
797 struct net_vrf
*vrf
= netdev_priv(dev
);
799 dev
->dstats
= netdev_alloc_pcpu_stats(struct pcpu_dstats
);
803 /* create the default dst which points back to us */
804 if (vrf_rtable_create(dev
) != 0)
807 if (vrf_rt6_create(dev
) != 0)
810 dev
->flags
= IFF_MASTER
| IFF_NOARP
;
812 /* MTU is irrelevant for VRF device; set to 64k similar to lo */
813 dev
->mtu
= 64 * 1024;
815 /* similarly, oper state is irrelevant; set to up to avoid confusion */
816 dev
->operstate
= IF_OPER_UP
;
817 netdev_lockdep_set_classes(dev
);
821 vrf_rtable_release(dev
, vrf
);
823 free_percpu(dev
->dstats
);
829 static const struct net_device_ops vrf_netdev_ops
= {
830 .ndo_init
= vrf_dev_init
,
831 .ndo_uninit
= vrf_dev_uninit
,
832 .ndo_start_xmit
= vrf_xmit
,
833 .ndo_get_stats64
= vrf_get_stats64
,
834 .ndo_add_slave
= vrf_add_slave
,
835 .ndo_del_slave
= vrf_del_slave
,
838 static u32
vrf_fib_table(const struct net_device
*dev
)
840 struct net_vrf
*vrf
= netdev_priv(dev
);
845 static int vrf_rcv_finish(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
850 static struct sk_buff
*vrf_rcv_nfhook(u8 pf
, unsigned int hook
,
852 struct net_device
*dev
)
854 struct net
*net
= dev_net(dev
);
856 if (NF_HOOK(pf
, hook
, net
, NULL
, skb
, dev
, NULL
, vrf_rcv_finish
) < 0)
857 skb
= NULL
; /* kfree_skb(skb) handled by nf code */
862 #if IS_ENABLED(CONFIG_IPV6)
863 /* neighbor handling is done with actual device; do not want
864 * to flip skb->dev for those ndisc packets. This really fails
865 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
868 static bool ipv6_ndisc_frame(const struct sk_buff
*skb
)
870 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
873 if (iph
->nexthdr
== NEXTHDR_ICMP
) {
874 const struct icmp6hdr
*icmph
;
875 struct icmp6hdr _icmph
;
877 icmph
= skb_header_pointer(skb
, sizeof(*iph
),
878 sizeof(_icmph
), &_icmph
);
882 switch (icmph
->icmp6_type
) {
883 case NDISC_ROUTER_SOLICITATION
:
884 case NDISC_ROUTER_ADVERTISEMENT
:
885 case NDISC_NEIGHBOUR_SOLICITATION
:
886 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
897 static struct rt6_info
*vrf_ip6_route_lookup(struct net
*net
,
898 const struct net_device
*dev
,
903 struct net_vrf
*vrf
= netdev_priv(dev
);
904 struct fib6_table
*table
= NULL
;
905 struct rt6_info
*rt6
;
909 /* fib6_table does not have a refcnt and can not be freed */
910 rt6
= rcu_dereference(vrf
->rt6
);
912 table
= rt6
->rt6i_table
;
919 return ip6_pol_route(net
, table
, ifindex
, fl6
, flags
);
922 static void vrf_ip6_input_dst(struct sk_buff
*skb
, struct net_device
*vrf_dev
,
925 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
926 struct flowi6 fl6
= {
929 .flowlabel
= ip6_flowinfo(iph
),
930 .flowi6_mark
= skb
->mark
,
931 .flowi6_proto
= iph
->nexthdr
,
932 .flowi6_iif
= ifindex
,
934 struct net
*net
= dev_net(vrf_dev
);
935 struct rt6_info
*rt6
;
937 rt6
= vrf_ip6_route_lookup(net
, vrf_dev
, &fl6
, ifindex
,
938 RT6_LOOKUP_F_HAS_SADDR
| RT6_LOOKUP_F_IFACE
);
942 if (unlikely(&rt6
->dst
== &net
->ipv6
.ip6_null_entry
->dst
))
945 skb_dst_set(skb
, &rt6
->dst
);
948 static struct sk_buff
*vrf_ip6_rcv(struct net_device
*vrf_dev
,
951 int orig_iif
= skb
->skb_iif
;
954 /* loopback traffic; do not push through packet taps again.
955 * Reset pkt_type for upper layers to process skb
957 if (skb
->pkt_type
== PACKET_LOOPBACK
) {
959 skb
->skb_iif
= vrf_dev
->ifindex
;
960 IP6CB(skb
)->flags
|= IP6SKB_L3SLAVE
;
961 skb
->pkt_type
= PACKET_HOST
;
965 /* if packet is NDISC or addressed to multicast or link-local
966 * then keep the ingress interface
968 need_strict
= rt6_need_strict(&ipv6_hdr(skb
)->daddr
);
969 if (!ipv6_ndisc_frame(skb
) && !need_strict
) {
971 skb
->skb_iif
= vrf_dev
->ifindex
;
973 skb_push(skb
, skb
->mac_len
);
974 dev_queue_xmit_nit(skb
, vrf_dev
);
975 skb_pull(skb
, skb
->mac_len
);
977 IP6CB(skb
)->flags
|= IP6SKB_L3SLAVE
;
981 vrf_ip6_input_dst(skb
, vrf_dev
, orig_iif
);
983 skb
= vrf_rcv_nfhook(NFPROTO_IPV6
, NF_INET_PRE_ROUTING
, skb
, vrf_dev
);
989 static struct sk_buff
*vrf_ip6_rcv(struct net_device
*vrf_dev
,
996 static struct sk_buff
*vrf_ip_rcv(struct net_device
*vrf_dev
,
1000 skb
->skb_iif
= vrf_dev
->ifindex
;
1001 IPCB(skb
)->flags
|= IPSKB_L3SLAVE
;
1003 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
1006 /* loopback traffic; do not push through packet taps again.
1007 * Reset pkt_type for upper layers to process skb
1009 if (skb
->pkt_type
== PACKET_LOOPBACK
) {
1010 skb
->pkt_type
= PACKET_HOST
;
1014 skb_push(skb
, skb
->mac_len
);
1015 dev_queue_xmit_nit(skb
, vrf_dev
);
1016 skb_pull(skb
, skb
->mac_len
);
1018 skb
= vrf_rcv_nfhook(NFPROTO_IPV4
, NF_INET_PRE_ROUTING
, skb
, vrf_dev
);
1023 /* called with rcu lock held */
1024 static struct sk_buff
*vrf_l3_rcv(struct net_device
*vrf_dev
,
1025 struct sk_buff
*skb
,
1030 return vrf_ip_rcv(vrf_dev
, skb
);
1032 return vrf_ip6_rcv(vrf_dev
, skb
);
1038 #if IS_ENABLED(CONFIG_IPV6)
1039 /* send to link-local or multicast address via interface enslaved to
1040 * VRF device. Force lookup to VRF table without changing flow struct
1042 static struct dst_entry
*vrf_link_scope_lookup(const struct net_device
*dev
,
1045 struct net
*net
= dev_net(dev
);
1046 int flags
= RT6_LOOKUP_F_IFACE
;
1047 struct dst_entry
*dst
= NULL
;
1048 struct rt6_info
*rt
;
1050 /* VRF device does not have a link-local address and
1051 * sending packets to link-local or mcast addresses over
1052 * a VRF device does not make sense
1054 if (fl6
->flowi6_oif
== dev
->ifindex
) {
1055 dst
= &net
->ipv6
.ip6_null_entry
->dst
;
1060 if (!ipv6_addr_any(&fl6
->saddr
))
1061 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
1063 rt
= vrf_ip6_route_lookup(net
, dev
, fl6
, fl6
->flowi6_oif
, flags
);
1071 static const struct l3mdev_ops vrf_l3mdev_ops
= {
1072 .l3mdev_fib_table
= vrf_fib_table
,
1073 .l3mdev_l3_rcv
= vrf_l3_rcv
,
1074 .l3mdev_l3_out
= vrf_l3_out
,
1075 #if IS_ENABLED(CONFIG_IPV6)
1076 .l3mdev_link_scope_lookup
= vrf_link_scope_lookup
,
1080 static void vrf_get_drvinfo(struct net_device
*dev
,
1081 struct ethtool_drvinfo
*info
)
1083 strlcpy(info
->driver
, DRV_NAME
, sizeof(info
->driver
));
1084 strlcpy(info
->version
, DRV_VERSION
, sizeof(info
->version
));
1087 static const struct ethtool_ops vrf_ethtool_ops
= {
1088 .get_drvinfo
= vrf_get_drvinfo
,
1091 static inline size_t vrf_fib_rule_nl_size(void)
1095 sz
= NLMSG_ALIGN(sizeof(struct fib_rule_hdr
));
1096 sz
+= nla_total_size(sizeof(u8
)); /* FRA_L3MDEV */
1097 sz
+= nla_total_size(sizeof(u32
)); /* FRA_PRIORITY */
1102 static int vrf_fib_rule(const struct net_device
*dev
, __u8 family
, bool add_it
)
1104 struct fib_rule_hdr
*frh
;
1105 struct nlmsghdr
*nlh
;
1106 struct sk_buff
*skb
;
1109 if (family
== AF_INET6
&& !ipv6_mod_enabled())
1112 skb
= nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL
);
1116 nlh
= nlmsg_put(skb
, 0, 0, 0, sizeof(*frh
), 0);
1118 goto nla_put_failure
;
1120 /* rule only needs to appear once */
1121 nlh
->nlmsg_flags
&= NLM_F_EXCL
;
1123 frh
= nlmsg_data(nlh
);
1124 memset(frh
, 0, sizeof(*frh
));
1125 frh
->family
= family
;
1126 frh
->action
= FR_ACT_TO_TBL
;
1128 if (nla_put_u32(skb
, FRA_L3MDEV
, 1))
1129 goto nla_put_failure
;
1131 if (nla_put_u32(skb
, FRA_PRIORITY
, FIB_RULE_PREF
))
1132 goto nla_put_failure
;
1134 nlmsg_end(skb
, nlh
);
1136 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1137 skb
->sk
= dev_net(dev
)->rtnl
;
1139 err
= fib_nl_newrule(skb
, nlh
);
1143 err
= fib_nl_delrule(skb
, nlh
);
1157 static int vrf_add_fib_rules(const struct net_device
*dev
)
1161 err
= vrf_fib_rule(dev
, AF_INET
, true);
1165 err
= vrf_fib_rule(dev
, AF_INET6
, true);
1169 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1170 err
= vrf_fib_rule(dev
, RTNL_FAMILY_IPMR
, true);
1177 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1179 vrf_fib_rule(dev
, AF_INET6
, false);
1183 vrf_fib_rule(dev
, AF_INET
, false);
1186 netdev_err(dev
, "Failed to add FIB rules.\n");
1190 static void vrf_setup(struct net_device
*dev
)
1194 /* Initialize the device structure. */
1195 dev
->netdev_ops
= &vrf_netdev_ops
;
1196 dev
->l3mdev_ops
= &vrf_l3mdev_ops
;
1197 dev
->ethtool_ops
= &vrf_ethtool_ops
;
1198 dev
->destructor
= free_netdev
;
1200 /* Fill in device structure with ethernet-generic values. */
1201 eth_hw_addr_random(dev
);
1203 /* don't acquire vrf device's netif_tx_lock when transmitting */
1204 dev
->features
|= NETIF_F_LLTX
;
1206 /* don't allow vrf devices to change network namespaces. */
1207 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1209 /* does not make sense for a VLAN to be added to a vrf device */
1210 dev
->features
|= NETIF_F_VLAN_CHALLENGED
;
1212 /* enable offload features */
1213 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
1214 dev
->features
|= NETIF_F_RXCSUM
| NETIF_F_HW_CSUM
;
1215 dev
->features
|= NETIF_F_SG
| NETIF_F_FRAGLIST
| NETIF_F_HIGHDMA
;
1217 dev
->hw_features
= dev
->features
;
1218 dev
->hw_enc_features
= dev
->features
;
1220 /* default to no qdisc; user can add if desired */
1221 dev
->priv_flags
|= IFF_NO_QUEUE
;
1224 static int vrf_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1226 if (tb
[IFLA_ADDRESS
]) {
1227 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1229 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1230 return -EADDRNOTAVAIL
;
1235 static void vrf_dellink(struct net_device
*dev
, struct list_head
*head
)
1237 unregister_netdevice_queue(dev
, head
);
1240 static int vrf_newlink(struct net
*src_net
, struct net_device
*dev
,
1241 struct nlattr
*tb
[], struct nlattr
*data
[])
1243 struct net_vrf
*vrf
= netdev_priv(dev
);
1246 if (!data
|| !data
[IFLA_VRF_TABLE
])
1249 vrf
->tb_id
= nla_get_u32(data
[IFLA_VRF_TABLE
]);
1251 dev
->priv_flags
|= IFF_L3MDEV_MASTER
;
1253 err
= register_netdevice(dev
);
1257 if (add_fib_rules
) {
1258 err
= vrf_add_fib_rules(dev
);
1260 unregister_netdevice(dev
);
1263 add_fib_rules
= false;
1270 static size_t vrf_nl_getsize(const struct net_device
*dev
)
1272 return nla_total_size(sizeof(u32
)); /* IFLA_VRF_TABLE */
1275 static int vrf_fillinfo(struct sk_buff
*skb
,
1276 const struct net_device
*dev
)
1278 struct net_vrf
*vrf
= netdev_priv(dev
);
1280 return nla_put_u32(skb
, IFLA_VRF_TABLE
, vrf
->tb_id
);
1283 static size_t vrf_get_slave_size(const struct net_device
*bond_dev
,
1284 const struct net_device
*slave_dev
)
1286 return nla_total_size(sizeof(u32
)); /* IFLA_VRF_PORT_TABLE */
1289 static int vrf_fill_slave_info(struct sk_buff
*skb
,
1290 const struct net_device
*vrf_dev
,
1291 const struct net_device
*slave_dev
)
1293 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
1295 if (nla_put_u32(skb
, IFLA_VRF_PORT_TABLE
, vrf
->tb_id
))
1301 static const struct nla_policy vrf_nl_policy
[IFLA_VRF_MAX
+ 1] = {
1302 [IFLA_VRF_TABLE
] = { .type
= NLA_U32
},
1305 static struct rtnl_link_ops vrf_link_ops __read_mostly
= {
1307 .priv_size
= sizeof(struct net_vrf
),
1309 .get_size
= vrf_nl_getsize
,
1310 .policy
= vrf_nl_policy
,
1311 .validate
= vrf_validate
,
1312 .fill_info
= vrf_fillinfo
,
1314 .get_slave_size
= vrf_get_slave_size
,
1315 .fill_slave_info
= vrf_fill_slave_info
,
1317 .newlink
= vrf_newlink
,
1318 .dellink
= vrf_dellink
,
1320 .maxtype
= IFLA_VRF_MAX
,
1323 static int vrf_device_event(struct notifier_block
*unused
,
1324 unsigned long event
, void *ptr
)
1326 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1328 /* only care about unregister events to drop slave references */
1329 if (event
== NETDEV_UNREGISTER
) {
1330 struct net_device
*vrf_dev
;
1332 if (!netif_is_l3_slave(dev
))
1335 vrf_dev
= netdev_master_upper_dev_get(dev
);
1336 vrf_del_slave(vrf_dev
, dev
);
1342 static struct notifier_block vrf_notifier_block __read_mostly
= {
1343 .notifier_call
= vrf_device_event
,
1346 static int __init
vrf_init_module(void)
1350 register_netdevice_notifier(&vrf_notifier_block
);
1352 rc
= rtnl_link_register(&vrf_link_ops
);
1359 unregister_netdevice_notifier(&vrf_notifier_block
);
1363 module_init(vrf_init_module
);
1364 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1365 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1366 MODULE_LICENSE("GPL");
1367 MODULE_ALIAS_RTNL_LINK(DRV_NAME
);
1368 MODULE_VERSION(DRV_VERSION
);