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 void 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
;
107 /* Local traffic destined to local address. Reinsert the packet to rx
108 * path, similar to loopback handling.
110 static int vrf_local_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
111 struct dst_entry
*dst
)
117 skb_dst_set(skb
, dst
);
120 /* set pkt_type to avoid skb hitting packet taps twice -
121 * once on Tx and again in Rx processing
123 skb
->pkt_type
= PACKET_LOOPBACK
;
125 skb
->protocol
= eth_type_trans(skb
, dev
);
127 if (likely(netif_rx(skb
) == NET_RX_SUCCESS
))
128 vrf_rx_stats(dev
, len
);
130 this_cpu_inc(dev
->dstats
->rx_drps
);
135 #if IS_ENABLED(CONFIG_IPV6)
136 static int vrf_ip6_local_out(struct net
*net
, struct sock
*sk
,
141 err
= nf_hook(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, net
,
142 sk
, skb
, NULL
, skb_dst(skb
)->dev
, dst_output
);
144 if (likely(err
== 1))
145 err
= dst_output(net
, sk
, skb
);
150 static netdev_tx_t
vrf_process_v6_outbound(struct sk_buff
*skb
,
151 struct net_device
*dev
)
153 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
154 struct net
*net
= dev_net(skb
->dev
);
155 struct flowi6 fl6
= {
156 /* needed to match OIF rule */
157 .flowi6_oif
= dev
->ifindex
,
158 .flowi6_iif
= LOOPBACK_IFINDEX
,
161 .flowlabel
= ip6_flowinfo(iph
),
162 .flowi6_mark
= skb
->mark
,
163 .flowi6_proto
= iph
->nexthdr
,
164 .flowi6_flags
= FLOWI_FLAG_SKIP_NH_OIF
,
166 int ret
= NET_XMIT_DROP
;
167 struct dst_entry
*dst
;
168 struct dst_entry
*dst_null
= &net
->ipv6
.ip6_null_entry
->dst
;
170 dst
= ip6_route_output(net
, NULL
, &fl6
);
176 /* if dst.dev is loopback or the VRF device again this is locally
177 * originated traffic destined to a local address. Short circuit
178 * to Rx path using our local dst
180 if (dst
->dev
== net
->loopback_dev
|| dst
->dev
== dev
) {
181 struct net_vrf
*vrf
= netdev_priv(dev
);
182 struct rt6_info
*rt6_local
;
184 /* release looked up dst and use cached local dst */
189 rt6_local
= rcu_dereference(vrf
->rt6_local
);
190 if (unlikely(!rt6_local
)) {
195 /* Ordering issue: cached local dst is created on newlink
196 * before the IPv6 initialization. Using the local dst
197 * requires rt6i_idev to be set so make sure it is.
199 if (unlikely(!rt6_local
->rt6i_idev
)) {
200 rt6_local
->rt6i_idev
= in6_dev_get(dev
);
201 if (!rt6_local
->rt6i_idev
) {
207 dst
= &rt6_local
->dst
;
212 return vrf_local_xmit(skb
, dev
, &rt6_local
->dst
);
215 skb_dst_set(skb
, dst
);
217 /* strip the ethernet header added for pass through VRF device */
218 __skb_pull(skb
, skb_network_offset(skb
));
220 ret
= vrf_ip6_local_out(net
, skb
->sk
, skb
);
221 if (unlikely(net_xmit_eval(ret
)))
222 dev
->stats
.tx_errors
++;
224 ret
= NET_XMIT_SUCCESS
;
228 vrf_tx_error(dev
, skb
);
229 return NET_XMIT_DROP
;
232 static netdev_tx_t
vrf_process_v6_outbound(struct sk_buff
*skb
,
233 struct net_device
*dev
)
235 vrf_tx_error(dev
, skb
);
236 return NET_XMIT_DROP
;
240 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
241 static int vrf_ip_local_out(struct net
*net
, struct sock
*sk
,
246 err
= nf_hook(NFPROTO_IPV4
, NF_INET_LOCAL_OUT
, net
, sk
,
247 skb
, NULL
, skb_dst(skb
)->dev
, dst_output
);
248 if (likely(err
== 1))
249 err
= dst_output(net
, sk
, skb
);
254 static netdev_tx_t
vrf_process_v4_outbound(struct sk_buff
*skb
,
255 struct net_device
*vrf_dev
)
257 struct iphdr
*ip4h
= ip_hdr(skb
);
258 int ret
= NET_XMIT_DROP
;
259 struct flowi4 fl4
= {
260 /* needed to match OIF rule */
261 .flowi4_oif
= vrf_dev
->ifindex
,
262 .flowi4_iif
= LOOPBACK_IFINDEX
,
263 .flowi4_tos
= RT_TOS(ip4h
->tos
),
264 .flowi4_flags
= FLOWI_FLAG_ANYSRC
| FLOWI_FLAG_SKIP_NH_OIF
,
265 .flowi4_proto
= ip4h
->protocol
,
266 .daddr
= ip4h
->daddr
,
267 .saddr
= ip4h
->saddr
,
269 struct net
*net
= dev_net(vrf_dev
);
272 rt
= ip_route_output_flow(net
, &fl4
, NULL
);
278 /* if dst.dev is loopback or the VRF device again this is locally
279 * originated traffic destined to a local address. Short circuit
280 * to Rx path using our local dst
282 if (rt
->dst
.dev
== net
->loopback_dev
|| rt
->dst
.dev
== vrf_dev
) {
283 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
284 struct rtable
*rth_local
;
285 struct dst_entry
*dst
= NULL
;
291 rth_local
= rcu_dereference(vrf
->rth_local
);
292 if (likely(rth_local
)) {
293 dst
= &rth_local
->dst
;
302 return vrf_local_xmit(skb
, vrf_dev
, dst
);
305 skb_dst_set(skb
, &rt
->dst
);
307 /* strip the ethernet header added for pass through VRF device */
308 __skb_pull(skb
, skb_network_offset(skb
));
311 ip4h
->saddr
= inet_select_addr(skb_dst(skb
)->dev
, 0,
315 ret
= vrf_ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
316 if (unlikely(net_xmit_eval(ret
)))
317 vrf_dev
->stats
.tx_errors
++;
319 ret
= NET_XMIT_SUCCESS
;
324 vrf_tx_error(vrf_dev
, skb
);
328 static netdev_tx_t
is_ip_tx_frame(struct sk_buff
*skb
, struct net_device
*dev
)
330 switch (skb
->protocol
) {
331 case htons(ETH_P_IP
):
332 return vrf_process_v4_outbound(skb
, dev
);
333 case htons(ETH_P_IPV6
):
334 return vrf_process_v6_outbound(skb
, dev
);
336 vrf_tx_error(dev
, skb
);
337 return NET_XMIT_DROP
;
341 static netdev_tx_t
vrf_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
343 netdev_tx_t ret
= is_ip_tx_frame(skb
, dev
);
345 if (likely(ret
== NET_XMIT_SUCCESS
|| ret
== NET_XMIT_CN
)) {
346 struct pcpu_dstats
*dstats
= this_cpu_ptr(dev
->dstats
);
348 u64_stats_update_begin(&dstats
->syncp
);
350 dstats
->tx_bytes
+= skb
->len
;
351 u64_stats_update_end(&dstats
->syncp
);
353 this_cpu_inc(dev
->dstats
->tx_drps
);
359 #if IS_ENABLED(CONFIG_IPV6)
360 /* modelled after ip6_finish_output2 */
361 static int vrf_finish_output6(struct net
*net
, struct sock
*sk
,
364 struct dst_entry
*dst
= skb_dst(skb
);
365 struct net_device
*dev
= dst
->dev
;
366 struct neighbour
*neigh
;
367 struct in6_addr
*nexthop
;
372 skb
->protocol
= htons(ETH_P_IPV6
);
376 nexthop
= rt6_nexthop((struct rt6_info
*)dst
, &ipv6_hdr(skb
)->daddr
);
377 neigh
= __ipv6_neigh_lookup_noref(dst
->dev
, nexthop
);
378 if (unlikely(!neigh
))
379 neigh
= __neigh_create(&nd_tbl
, nexthop
, dst
->dev
, false);
380 if (!IS_ERR(neigh
)) {
381 sock_confirm_neigh(skb
, neigh
);
382 ret
= neigh_output(neigh
, skb
);
383 rcu_read_unlock_bh();
386 rcu_read_unlock_bh();
388 IP6_INC_STATS(dev_net(dst
->dev
),
389 ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
394 /* modelled after ip6_output */
395 static int vrf_output6(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
397 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
398 net
, sk
, skb
, NULL
, skb_dst(skb
)->dev
,
400 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
403 /* set dst on skb to send packet to us via dev_xmit path. Allows
404 * packet to go through device based features such as qdisc, netfilter
405 * hooks and packet sockets with skb->dev set to vrf device.
407 static struct sk_buff
*vrf_ip6_out(struct net_device
*vrf_dev
,
411 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
412 struct dst_entry
*dst
= NULL
;
413 struct rt6_info
*rt6
;
415 /* don't divert link scope packets */
416 if (rt6_need_strict(&ipv6_hdr(skb
)->daddr
))
421 rt6
= rcu_dereference(vrf
->rt6
);
429 if (unlikely(!dst
)) {
430 vrf_tx_error(vrf_dev
, skb
);
435 skb_dst_set(skb
, dst
);
441 static void vrf_rt6_release(struct net_device
*dev
, struct net_vrf
*vrf
)
443 struct rt6_info
*rt6
= rtnl_dereference(vrf
->rt6
);
444 struct rt6_info
*rt6_local
= rtnl_dereference(vrf
->rt6_local
);
445 struct net
*net
= dev_net(dev
);
446 struct dst_entry
*dst
;
448 RCU_INIT_POINTER(vrf
->rt6
, NULL
);
449 RCU_INIT_POINTER(vrf
->rt6_local
, NULL
);
452 /* move dev in dst's to loopback so this VRF device can be deleted
453 * - based on dst_ifdown
458 dst
->dev
= net
->loopback_dev
;
464 if (rt6_local
->rt6i_idev
)
465 in6_dev_put(rt6_local
->rt6i_idev
);
467 dst
= &rt6_local
->dst
;
469 dst
->dev
= net
->loopback_dev
;
475 static int vrf_rt6_create(struct net_device
*dev
)
477 int flags
= DST_HOST
| DST_NOPOLICY
| DST_NOXFRM
| DST_NOCACHE
;
478 struct net_vrf
*vrf
= netdev_priv(dev
);
479 struct net
*net
= dev_net(dev
);
480 struct fib6_table
*rt6i_table
;
481 struct rt6_info
*rt6
, *rt6_local
;
484 /* IPv6 can be CONFIG enabled and then disabled runtime */
485 if (!ipv6_mod_enabled())
488 rt6i_table
= fib6_new_table(net
, vrf
->tb_id
);
492 /* create a dst for routing packets out a VRF device */
493 rt6
= ip6_dst_alloc(net
, dev
, flags
);
499 rt6
->rt6i_table
= rt6i_table
;
500 rt6
->dst
.output
= vrf_output6
;
502 /* create a dst for local routing - packets sent locally
503 * to local address via the VRF device as a loopback
505 rt6_local
= ip6_dst_alloc(net
, dev
, flags
);
507 dst_release(&rt6
->dst
);
511 dst_hold(&rt6_local
->dst
);
513 rt6_local
->rt6i_idev
= in6_dev_get(dev
);
514 rt6_local
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
| RTF_LOCAL
;
515 rt6_local
->rt6i_table
= rt6i_table
;
516 rt6_local
->dst
.input
= ip6_input
;
518 rcu_assign_pointer(vrf
->rt6
, rt6
);
519 rcu_assign_pointer(vrf
->rt6_local
, rt6_local
);
526 static struct sk_buff
*vrf_ip6_out(struct net_device
*vrf_dev
,
533 static void vrf_rt6_release(struct net_device
*dev
, struct net_vrf
*vrf
)
537 static int vrf_rt6_create(struct net_device
*dev
)
543 /* modelled after ip_finish_output2 */
544 static int vrf_finish_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
546 struct dst_entry
*dst
= skb_dst(skb
);
547 struct rtable
*rt
= (struct rtable
*)dst
;
548 struct net_device
*dev
= dst
->dev
;
549 unsigned int hh_len
= LL_RESERVED_SPACE(dev
);
550 struct neighbour
*neigh
;
556 /* Be paranoid, rather than too clever. */
557 if (unlikely(skb_headroom(skb
) < hh_len
&& dev
->header_ops
)) {
558 struct sk_buff
*skb2
;
560 skb2
= skb_realloc_headroom(skb
, LL_RESERVED_SPACE(dev
));
566 skb_set_owner_w(skb2
, skb
->sk
);
574 nexthop
= (__force u32
)rt_nexthop(rt
, ip_hdr(skb
)->daddr
);
575 neigh
= __ipv4_neigh_lookup_noref(dev
, nexthop
);
576 if (unlikely(!neigh
))
577 neigh
= __neigh_create(&arp_tbl
, &nexthop
, dev
, false);
578 if (!IS_ERR(neigh
)) {
579 sock_confirm_neigh(skb
, neigh
);
580 ret
= neigh_output(neigh
, skb
);
583 rcu_read_unlock_bh();
585 if (unlikely(ret
< 0))
586 vrf_tx_error(skb
->dev
, skb
);
590 static int vrf_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
592 struct net_device
*dev
= skb_dst(skb
)->dev
;
594 IP_UPD_PO_STATS(net
, IPSTATS_MIB_OUT
, skb
->len
);
597 skb
->protocol
= htons(ETH_P_IP
);
599 return NF_HOOK_COND(NFPROTO_IPV4
, NF_INET_POST_ROUTING
,
600 net
, sk
, skb
, NULL
, dev
,
602 !(IPCB(skb
)->flags
& IPSKB_REROUTED
));
605 /* set dst on skb to send packet to us via dev_xmit path. Allows
606 * packet to go through device based features such as qdisc, netfilter
607 * hooks and packet sockets with skb->dev set to vrf device.
609 static struct sk_buff
*vrf_ip_out(struct net_device
*vrf_dev
,
613 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
614 struct dst_entry
*dst
= NULL
;
617 /* don't divert multicast */
618 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
623 rth
= rcu_dereference(vrf
->rth
);
631 if (unlikely(!dst
)) {
632 vrf_tx_error(vrf_dev
, skb
);
637 skb_dst_set(skb
, dst
);
642 /* called with rcu lock held */
643 static struct sk_buff
*vrf_l3_out(struct net_device
*vrf_dev
,
650 return vrf_ip_out(vrf_dev
, sk
, skb
);
652 return vrf_ip6_out(vrf_dev
, sk
, skb
);
659 static void vrf_rtable_release(struct net_device
*dev
, struct net_vrf
*vrf
)
661 struct rtable
*rth
= rtnl_dereference(vrf
->rth
);
662 struct rtable
*rth_local
= rtnl_dereference(vrf
->rth_local
);
663 struct net
*net
= dev_net(dev
);
664 struct dst_entry
*dst
;
666 RCU_INIT_POINTER(vrf
->rth
, NULL
);
667 RCU_INIT_POINTER(vrf
->rth_local
, NULL
);
670 /* move dev in dst's to loopback so this VRF device can be deleted
671 * - based on dst_ifdown
676 dst
->dev
= net
->loopback_dev
;
682 dst
= &rth_local
->dst
;
684 dst
->dev
= net
->loopback_dev
;
690 static int vrf_rtable_create(struct net_device
*dev
)
692 struct net_vrf
*vrf
= netdev_priv(dev
);
693 struct rtable
*rth
, *rth_local
;
695 if (!fib_new_table(dev_net(dev
), vrf
->tb_id
))
698 /* create a dst for routing packets out through a VRF device */
699 rth
= rt_dst_alloc(dev
, 0, RTN_UNICAST
, 1, 1, 0);
703 /* create a dst for local ingress routing - packets sent locally
704 * to local address via the VRF device as a loopback
706 rth_local
= rt_dst_alloc(dev
, RTCF_LOCAL
, RTN_LOCAL
, 1, 1, 0);
708 dst_release(&rth
->dst
);
712 rth
->dst
.output
= vrf_output
;
713 rth
->rt_table_id
= vrf
->tb_id
;
715 rth_local
->rt_table_id
= vrf
->tb_id
;
717 rcu_assign_pointer(vrf
->rth
, rth
);
718 rcu_assign_pointer(vrf
->rth_local
, rth_local
);
723 /**************************** device handling ********************/
725 /* cycle interface to flush neighbor cache and move routes across tables */
726 static void cycle_netdev(struct net_device
*dev
)
728 unsigned int flags
= dev
->flags
;
731 if (!netif_running(dev
))
734 ret
= dev_change_flags(dev
, flags
& ~IFF_UP
);
736 ret
= dev_change_flags(dev
, flags
);
740 "Failed to cycle device %s; route tables might be wrong!\n",
745 static int do_vrf_add_slave(struct net_device
*dev
, struct net_device
*port_dev
)
749 ret
= netdev_master_upper_dev_link(port_dev
, dev
, NULL
, NULL
);
753 port_dev
->priv_flags
|= IFF_L3MDEV_SLAVE
;
754 cycle_netdev(port_dev
);
759 static int vrf_add_slave(struct net_device
*dev
, struct net_device
*port_dev
)
761 if (netif_is_l3_master(port_dev
) || netif_is_l3_slave(port_dev
))
764 return do_vrf_add_slave(dev
, port_dev
);
767 /* inverse of do_vrf_add_slave */
768 static int do_vrf_del_slave(struct net_device
*dev
, struct net_device
*port_dev
)
770 netdev_upper_dev_unlink(port_dev
, dev
);
771 port_dev
->priv_flags
&= ~IFF_L3MDEV_SLAVE
;
773 cycle_netdev(port_dev
);
778 static int vrf_del_slave(struct net_device
*dev
, struct net_device
*port_dev
)
780 return do_vrf_del_slave(dev
, port_dev
);
783 static void vrf_dev_uninit(struct net_device
*dev
)
785 struct net_vrf
*vrf
= netdev_priv(dev
);
786 struct net_device
*port_dev
;
787 struct list_head
*iter
;
789 vrf_rtable_release(dev
, vrf
);
790 vrf_rt6_release(dev
, vrf
);
792 netdev_for_each_lower_dev(dev
, port_dev
, iter
)
793 vrf_del_slave(dev
, port_dev
);
795 free_percpu(dev
->dstats
);
799 static int vrf_dev_init(struct net_device
*dev
)
801 struct net_vrf
*vrf
= netdev_priv(dev
);
803 dev
->dstats
= netdev_alloc_pcpu_stats(struct pcpu_dstats
);
807 /* create the default dst which points back to us */
808 if (vrf_rtable_create(dev
) != 0)
811 if (vrf_rt6_create(dev
) != 0)
814 dev
->flags
= IFF_MASTER
| IFF_NOARP
;
816 /* MTU is irrelevant for VRF device; set to 64k similar to lo */
817 dev
->mtu
= 64 * 1024;
819 /* similarly, oper state is irrelevant; set to up to avoid confusion */
820 dev
->operstate
= IF_OPER_UP
;
821 netdev_lockdep_set_classes(dev
);
825 vrf_rtable_release(dev
, vrf
);
827 free_percpu(dev
->dstats
);
833 static const struct net_device_ops vrf_netdev_ops
= {
834 .ndo_init
= vrf_dev_init
,
835 .ndo_uninit
= vrf_dev_uninit
,
836 .ndo_start_xmit
= vrf_xmit
,
837 .ndo_get_stats64
= vrf_get_stats64
,
838 .ndo_add_slave
= vrf_add_slave
,
839 .ndo_del_slave
= vrf_del_slave
,
842 static u32
vrf_fib_table(const struct net_device
*dev
)
844 struct net_vrf
*vrf
= netdev_priv(dev
);
849 static int vrf_rcv_finish(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
854 static struct sk_buff
*vrf_rcv_nfhook(u8 pf
, unsigned int hook
,
856 struct net_device
*dev
)
858 struct net
*net
= dev_net(dev
);
860 if (NF_HOOK(pf
, hook
, net
, NULL
, skb
, dev
, NULL
, vrf_rcv_finish
) < 0)
861 skb
= NULL
; /* kfree_skb(skb) handled by nf code */
866 #if IS_ENABLED(CONFIG_IPV6)
867 /* neighbor handling is done with actual device; do not want
868 * to flip skb->dev for those ndisc packets. This really fails
869 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
872 static bool ipv6_ndisc_frame(const struct sk_buff
*skb
)
874 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
877 if (iph
->nexthdr
== NEXTHDR_ICMP
) {
878 const struct icmp6hdr
*icmph
;
879 struct icmp6hdr _icmph
;
881 icmph
= skb_header_pointer(skb
, sizeof(*iph
),
882 sizeof(_icmph
), &_icmph
);
886 switch (icmph
->icmp6_type
) {
887 case NDISC_ROUTER_SOLICITATION
:
888 case NDISC_ROUTER_ADVERTISEMENT
:
889 case NDISC_NEIGHBOUR_SOLICITATION
:
890 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
901 static struct rt6_info
*vrf_ip6_route_lookup(struct net
*net
,
902 const struct net_device
*dev
,
907 struct net_vrf
*vrf
= netdev_priv(dev
);
908 struct fib6_table
*table
= NULL
;
909 struct rt6_info
*rt6
;
913 /* fib6_table does not have a refcnt and can not be freed */
914 rt6
= rcu_dereference(vrf
->rt6
);
916 table
= rt6
->rt6i_table
;
923 return ip6_pol_route(net
, table
, ifindex
, fl6
, flags
);
926 static void vrf_ip6_input_dst(struct sk_buff
*skb
, struct net_device
*vrf_dev
,
929 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
930 struct flowi6 fl6
= {
933 .flowlabel
= ip6_flowinfo(iph
),
934 .flowi6_mark
= skb
->mark
,
935 .flowi6_proto
= iph
->nexthdr
,
936 .flowi6_iif
= ifindex
,
938 struct net
*net
= dev_net(vrf_dev
);
939 struct rt6_info
*rt6
;
941 rt6
= vrf_ip6_route_lookup(net
, vrf_dev
, &fl6
, ifindex
,
942 RT6_LOOKUP_F_HAS_SADDR
| RT6_LOOKUP_F_IFACE
);
946 if (unlikely(&rt6
->dst
== &net
->ipv6
.ip6_null_entry
->dst
))
949 skb_dst_set(skb
, &rt6
->dst
);
952 static struct sk_buff
*vrf_ip6_rcv(struct net_device
*vrf_dev
,
955 int orig_iif
= skb
->skb_iif
;
958 /* loopback traffic; do not push through packet taps again.
959 * Reset pkt_type for upper layers to process skb
961 if (skb
->pkt_type
== PACKET_LOOPBACK
) {
963 skb
->skb_iif
= vrf_dev
->ifindex
;
964 IP6CB(skb
)->flags
|= IP6SKB_L3SLAVE
;
965 skb
->pkt_type
= PACKET_HOST
;
969 /* if packet is NDISC or addressed to multicast or link-local
970 * then keep the ingress interface
972 need_strict
= rt6_need_strict(&ipv6_hdr(skb
)->daddr
);
973 if (!ipv6_ndisc_frame(skb
) && !need_strict
) {
974 vrf_rx_stats(vrf_dev
, skb
->len
);
976 skb
->skb_iif
= vrf_dev
->ifindex
;
978 skb_push(skb
, skb
->mac_len
);
979 dev_queue_xmit_nit(skb
, vrf_dev
);
980 skb_pull(skb
, skb
->mac_len
);
982 IP6CB(skb
)->flags
|= IP6SKB_L3SLAVE
;
986 vrf_ip6_input_dst(skb
, vrf_dev
, orig_iif
);
988 skb
= vrf_rcv_nfhook(NFPROTO_IPV6
, NF_INET_PRE_ROUTING
, skb
, vrf_dev
);
994 static struct sk_buff
*vrf_ip6_rcv(struct net_device
*vrf_dev
,
1001 static struct sk_buff
*vrf_ip_rcv(struct net_device
*vrf_dev
,
1002 struct sk_buff
*skb
)
1005 skb
->skb_iif
= vrf_dev
->ifindex
;
1006 IPCB(skb
)->flags
|= IPSKB_L3SLAVE
;
1008 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
1011 /* loopback traffic; do not push through packet taps again.
1012 * Reset pkt_type for upper layers to process skb
1014 if (skb
->pkt_type
== PACKET_LOOPBACK
) {
1015 skb
->pkt_type
= PACKET_HOST
;
1019 vrf_rx_stats(vrf_dev
, skb
->len
);
1021 skb_push(skb
, skb
->mac_len
);
1022 dev_queue_xmit_nit(skb
, vrf_dev
);
1023 skb_pull(skb
, skb
->mac_len
);
1025 skb
= vrf_rcv_nfhook(NFPROTO_IPV4
, NF_INET_PRE_ROUTING
, skb
, vrf_dev
);
1030 /* called with rcu lock held */
1031 static struct sk_buff
*vrf_l3_rcv(struct net_device
*vrf_dev
,
1032 struct sk_buff
*skb
,
1037 return vrf_ip_rcv(vrf_dev
, skb
);
1039 return vrf_ip6_rcv(vrf_dev
, skb
);
1045 #if IS_ENABLED(CONFIG_IPV6)
1046 /* send to link-local or multicast address via interface enslaved to
1047 * VRF device. Force lookup to VRF table without changing flow struct
1049 static struct dst_entry
*vrf_link_scope_lookup(const struct net_device
*dev
,
1052 struct net
*net
= dev_net(dev
);
1053 int flags
= RT6_LOOKUP_F_IFACE
;
1054 struct dst_entry
*dst
= NULL
;
1055 struct rt6_info
*rt
;
1057 /* VRF device does not have a link-local address and
1058 * sending packets to link-local or mcast addresses over
1059 * a VRF device does not make sense
1061 if (fl6
->flowi6_oif
== dev
->ifindex
) {
1062 dst
= &net
->ipv6
.ip6_null_entry
->dst
;
1067 if (!ipv6_addr_any(&fl6
->saddr
))
1068 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
1070 rt
= vrf_ip6_route_lookup(net
, dev
, fl6
, fl6
->flowi6_oif
, flags
);
1078 static const struct l3mdev_ops vrf_l3mdev_ops
= {
1079 .l3mdev_fib_table
= vrf_fib_table
,
1080 .l3mdev_l3_rcv
= vrf_l3_rcv
,
1081 .l3mdev_l3_out
= vrf_l3_out
,
1082 #if IS_ENABLED(CONFIG_IPV6)
1083 .l3mdev_link_scope_lookup
= vrf_link_scope_lookup
,
1087 static void vrf_get_drvinfo(struct net_device
*dev
,
1088 struct ethtool_drvinfo
*info
)
1090 strlcpy(info
->driver
, DRV_NAME
, sizeof(info
->driver
));
1091 strlcpy(info
->version
, DRV_VERSION
, sizeof(info
->version
));
1094 static const struct ethtool_ops vrf_ethtool_ops
= {
1095 .get_drvinfo
= vrf_get_drvinfo
,
1098 static inline size_t vrf_fib_rule_nl_size(void)
1102 sz
= NLMSG_ALIGN(sizeof(struct fib_rule_hdr
));
1103 sz
+= nla_total_size(sizeof(u8
)); /* FRA_L3MDEV */
1104 sz
+= nla_total_size(sizeof(u32
)); /* FRA_PRIORITY */
1109 static int vrf_fib_rule(const struct net_device
*dev
, __u8 family
, bool add_it
)
1111 struct fib_rule_hdr
*frh
;
1112 struct nlmsghdr
*nlh
;
1113 struct sk_buff
*skb
;
1116 if (family
== AF_INET6
&& !ipv6_mod_enabled())
1119 skb
= nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL
);
1123 nlh
= nlmsg_put(skb
, 0, 0, 0, sizeof(*frh
), 0);
1125 goto nla_put_failure
;
1127 /* rule only needs to appear once */
1128 nlh
->nlmsg_flags
&= NLM_F_EXCL
;
1130 frh
= nlmsg_data(nlh
);
1131 memset(frh
, 0, sizeof(*frh
));
1132 frh
->family
= family
;
1133 frh
->action
= FR_ACT_TO_TBL
;
1135 if (nla_put_u32(skb
, FRA_L3MDEV
, 1))
1136 goto nla_put_failure
;
1138 if (nla_put_u32(skb
, FRA_PRIORITY
, FIB_RULE_PREF
))
1139 goto nla_put_failure
;
1141 nlmsg_end(skb
, nlh
);
1143 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1144 skb
->sk
= dev_net(dev
)->rtnl
;
1146 err
= fib_nl_newrule(skb
, nlh
);
1150 err
= fib_nl_delrule(skb
, nlh
);
1164 static int vrf_add_fib_rules(const struct net_device
*dev
)
1168 err
= vrf_fib_rule(dev
, AF_INET
, true);
1172 err
= vrf_fib_rule(dev
, AF_INET6
, true);
1176 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1177 err
= vrf_fib_rule(dev
, RTNL_FAMILY_IPMR
, true);
1184 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1186 vrf_fib_rule(dev
, AF_INET6
, false);
1190 vrf_fib_rule(dev
, AF_INET
, false);
1193 netdev_err(dev
, "Failed to add FIB rules.\n");
1197 static void vrf_setup(struct net_device
*dev
)
1201 /* Initialize the device structure. */
1202 dev
->netdev_ops
= &vrf_netdev_ops
;
1203 dev
->l3mdev_ops
= &vrf_l3mdev_ops
;
1204 dev
->ethtool_ops
= &vrf_ethtool_ops
;
1205 dev
->destructor
= free_netdev
;
1207 /* Fill in device structure with ethernet-generic values. */
1208 eth_hw_addr_random(dev
);
1210 /* don't acquire vrf device's netif_tx_lock when transmitting */
1211 dev
->features
|= NETIF_F_LLTX
;
1213 /* don't allow vrf devices to change network namespaces. */
1214 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1216 /* does not make sense for a VLAN to be added to a vrf device */
1217 dev
->features
|= NETIF_F_VLAN_CHALLENGED
;
1219 /* enable offload features */
1220 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
1221 dev
->features
|= NETIF_F_RXCSUM
| NETIF_F_HW_CSUM
;
1222 dev
->features
|= NETIF_F_SG
| NETIF_F_FRAGLIST
| NETIF_F_HIGHDMA
;
1224 dev
->hw_features
= dev
->features
;
1225 dev
->hw_enc_features
= dev
->features
;
1227 /* default to no qdisc; user can add if desired */
1228 dev
->priv_flags
|= IFF_NO_QUEUE
;
1231 static int vrf_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1233 if (tb
[IFLA_ADDRESS
]) {
1234 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1236 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1237 return -EADDRNOTAVAIL
;
1242 static void vrf_dellink(struct net_device
*dev
, struct list_head
*head
)
1244 unregister_netdevice_queue(dev
, head
);
1247 static int vrf_newlink(struct net
*src_net
, struct net_device
*dev
,
1248 struct nlattr
*tb
[], struct nlattr
*data
[])
1250 struct net_vrf
*vrf
= netdev_priv(dev
);
1253 if (!data
|| !data
[IFLA_VRF_TABLE
])
1256 vrf
->tb_id
= nla_get_u32(data
[IFLA_VRF_TABLE
]);
1257 if (vrf
->tb_id
== RT_TABLE_UNSPEC
)
1260 dev
->priv_flags
|= IFF_L3MDEV_MASTER
;
1262 err
= register_netdevice(dev
);
1266 if (add_fib_rules
) {
1267 err
= vrf_add_fib_rules(dev
);
1269 unregister_netdevice(dev
);
1272 add_fib_rules
= false;
1279 static size_t vrf_nl_getsize(const struct net_device
*dev
)
1281 return nla_total_size(sizeof(u32
)); /* IFLA_VRF_TABLE */
1284 static int vrf_fillinfo(struct sk_buff
*skb
,
1285 const struct net_device
*dev
)
1287 struct net_vrf
*vrf
= netdev_priv(dev
);
1289 return nla_put_u32(skb
, IFLA_VRF_TABLE
, vrf
->tb_id
);
1292 static size_t vrf_get_slave_size(const struct net_device
*bond_dev
,
1293 const struct net_device
*slave_dev
)
1295 return nla_total_size(sizeof(u32
)); /* IFLA_VRF_PORT_TABLE */
1298 static int vrf_fill_slave_info(struct sk_buff
*skb
,
1299 const struct net_device
*vrf_dev
,
1300 const struct net_device
*slave_dev
)
1302 struct net_vrf
*vrf
= netdev_priv(vrf_dev
);
1304 if (nla_put_u32(skb
, IFLA_VRF_PORT_TABLE
, vrf
->tb_id
))
1310 static const struct nla_policy vrf_nl_policy
[IFLA_VRF_MAX
+ 1] = {
1311 [IFLA_VRF_TABLE
] = { .type
= NLA_U32
},
1314 static struct rtnl_link_ops vrf_link_ops __read_mostly
= {
1316 .priv_size
= sizeof(struct net_vrf
),
1318 .get_size
= vrf_nl_getsize
,
1319 .policy
= vrf_nl_policy
,
1320 .validate
= vrf_validate
,
1321 .fill_info
= vrf_fillinfo
,
1323 .get_slave_size
= vrf_get_slave_size
,
1324 .fill_slave_info
= vrf_fill_slave_info
,
1326 .newlink
= vrf_newlink
,
1327 .dellink
= vrf_dellink
,
1329 .maxtype
= IFLA_VRF_MAX
,
1332 static int vrf_device_event(struct notifier_block
*unused
,
1333 unsigned long event
, void *ptr
)
1335 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1337 /* only care about unregister events to drop slave references */
1338 if (event
== NETDEV_UNREGISTER
) {
1339 struct net_device
*vrf_dev
;
1341 if (!netif_is_l3_slave(dev
))
1344 vrf_dev
= netdev_master_upper_dev_get(dev
);
1345 vrf_del_slave(vrf_dev
, dev
);
1351 static struct notifier_block vrf_notifier_block __read_mostly
= {
1352 .notifier_call
= vrf_device_event
,
1355 static int __init
vrf_init_module(void)
1359 register_netdevice_notifier(&vrf_notifier_block
);
1361 rc
= rtnl_link_register(&vrf_link_ops
);
1368 unregister_netdevice_notifier(&vrf_notifier_block
);
1372 module_init(vrf_init_module
);
1373 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1374 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1375 MODULE_LICENSE("GPL");
1376 MODULE_ALIAS_RTNL_LINK(DRV_NAME
);
1377 MODULE_VERSION(DRV_VERSION
);