2 * GENEVE: Generic Network Virtualization Encapsulation
4 * Copyright (c) 2015 Red Hat, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/etherdevice.h>
16 #include <linux/hash.h>
17 #include <net/dst_metadata.h>
18 #include <net/gro_cells.h>
19 #include <net/rtnetlink.h>
20 #include <net/geneve.h>
21 #include <net/protocol.h>
23 #define GENEVE_NETDEV_VER "0.6"
25 #define GENEVE_UDP_PORT 6081
27 #define GENEVE_N_VID (1u << 24)
28 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
30 #define VNI_HASH_BITS 10
31 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33 static bool log_ecn_error = true;
34 module_param(log_ecn_error, bool, 0644);
35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
40 /* per-network namespace private data for this module */
42 struct list_head geneve_list;
43 struct list_head sock_list;
46 static int geneve_net_id;
49 struct sockaddr_in sin;
50 struct sockaddr_in6 sin6;
54 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
56 /* Pseudo network device */
58 struct hlist_node hlist; /* vni hash table */
59 struct net *net; /* netns for packet i/o */
60 struct net_device *dev; /* netdev for geneve tunnel */
61 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
62 #if IS_ENABLED(CONFIG_IPV6)
63 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
65 u8 vni[3]; /* virtual network ID for tunnel */
66 u8 ttl; /* TTL override */
67 u8 tos; /* TOS override */
68 union geneve_addr remote; /* IP address for link partner */
69 struct list_head next; /* geneve's per namespace list */
70 __be32 label; /* IPv6 flowlabel override */
73 struct gro_cells gro_cells;
75 struct dst_cache dst_cache;
78 /* Geneve device flags */
79 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
80 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
81 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
85 struct list_head list;
89 struct hlist_head vni_list[VNI_HASH_SIZE];
93 static inline __u32 geneve_net_vni_hash(u8 vni[3])
97 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
98 return hash_32(vnid, VNI_HASH_BITS);
101 static __be64 vni_to_tunnel_id(const __u8 *vni)
104 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
106 return (__force __be64)(((__force u64)vni[0] << 40) |
107 ((__force u64)vni[1] << 48) |
108 ((__force u64)vni[2] << 56));
112 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
114 return gs->sock->sk->sk_family;
117 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
118 __be32 addr, u8 vni[])
120 struct hlist_head *vni_list_head;
121 struct geneve_dev *geneve;
124 /* Find the device for this VNI */
125 hash = geneve_net_vni_hash(vni);
126 vni_list_head = &gs->vni_list[hash];
127 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
128 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
129 addr == geneve->remote.sin.sin_addr.s_addr)
135 #if IS_ENABLED(CONFIG_IPV6)
136 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
137 struct in6_addr addr6, u8 vni[])
139 struct hlist_head *vni_list_head;
140 struct geneve_dev *geneve;
143 /* Find the device for this VNI */
144 hash = geneve_net_vni_hash(vni);
145 vni_list_head = &gs->vni_list[hash];
146 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
147 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
148 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
155 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
157 return (struct genevehdr *)(udp_hdr(skb) + 1);
160 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
165 static u8 zero_vni[3];
166 #if IS_ENABLED(CONFIG_IPV6)
167 static struct in6_addr zero_addr6;
170 if (geneve_get_sk_family(gs) == AF_INET) {
173 iph = ip_hdr(skb); /* outer IP header... */
175 if (gs->collect_md) {
179 vni = geneve_hdr(skb)->vni;
183 return geneve_lookup(gs, addr, vni);
184 #if IS_ENABLED(CONFIG_IPV6)
185 } else if (geneve_get_sk_family(gs) == AF_INET6) {
186 struct ipv6hdr *ip6h;
187 struct in6_addr addr6;
189 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
191 if (gs->collect_md) {
195 vni = geneve_hdr(skb)->vni;
199 return geneve6_lookup(gs, addr6, vni);
205 /* geneve receive/decap routine */
206 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
209 struct genevehdr *gnvh = geneve_hdr(skb);
210 struct metadata_dst *tun_dst = NULL;
211 struct pcpu_sw_netstats *stats;
215 if (ip_tunnel_collect_metadata() || gs->collect_md) {
218 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
219 (gnvh->oam ? TUNNEL_OAM : 0) |
220 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
222 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
223 vni_to_tunnel_id(gnvh->vni),
227 /* Update tunnel dst according to Geneve options. */
228 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
229 gnvh->options, gnvh->opt_len * 4);
231 /* Drop packets w/ critical options,
232 * since we don't support any...
238 skb_reset_mac_header(skb);
239 skb->protocol = eth_type_trans(skb, geneve->dev);
240 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
243 skb_dst_set(skb, &tun_dst->dst);
245 /* Ignore packet loops (and multicast echo) */
246 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
249 oiph = skb_network_header(skb);
250 skb_reset_network_header(skb);
252 if (geneve_get_sk_family(gs) == AF_INET)
253 err = IP_ECN_decapsulate(oiph, skb);
254 #if IS_ENABLED(CONFIG_IPV6)
256 err = IP6_ECN_decapsulate(oiph, skb);
261 if (geneve_get_sk_family(gs) == AF_INET)
262 net_info_ratelimited("non-ECT from %pI4 "
264 &((struct iphdr *)oiph)->saddr,
265 ((struct iphdr *)oiph)->tos);
266 #if IS_ENABLED(CONFIG_IPV6)
268 net_info_ratelimited("non-ECT from %pI6\n",
269 &((struct ipv6hdr *)oiph)->saddr);
273 ++geneve->dev->stats.rx_frame_errors;
274 ++geneve->dev->stats.rx_errors;
279 stats = this_cpu_ptr(geneve->dev->tstats);
280 u64_stats_update_begin(&stats->syncp);
282 stats->rx_bytes += skb->len;
283 u64_stats_update_end(&stats->syncp);
285 gro_cells_receive(&geneve->gro_cells, skb);
288 /* Consume bad packet */
292 /* Setup stats when device is created */
293 static int geneve_init(struct net_device *dev)
295 struct geneve_dev *geneve = netdev_priv(dev);
298 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
302 err = gro_cells_init(&geneve->gro_cells, dev);
304 free_percpu(dev->tstats);
308 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
310 free_percpu(dev->tstats);
311 gro_cells_destroy(&geneve->gro_cells);
318 static void geneve_uninit(struct net_device *dev)
320 struct geneve_dev *geneve = netdev_priv(dev);
322 dst_cache_destroy(&geneve->dst_cache);
323 gro_cells_destroy(&geneve->gro_cells);
324 free_percpu(dev->tstats);
327 /* Callback from net/ipv4/udp.c to receive packets */
328 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
330 struct genevehdr *geneveh;
331 struct geneve_dev *geneve;
332 struct geneve_sock *gs;
335 /* Need Geneve and inner Ethernet header to be present */
336 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
339 /* Return packets with reserved bits set */
340 geneveh = geneve_hdr(skb);
341 if (unlikely(geneveh->ver != GENEVE_VER))
344 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
347 gs = rcu_dereference_sk_user_data(sk);
351 geneve = geneve_lookup_skb(gs, skb);
355 opts_len = geneveh->opt_len * 4;
356 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
358 !net_eq(geneve->net, dev_net(geneve->dev))))
361 geneve_rx(geneve, gs, skb);
365 /* Consume bad packet */
370 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
371 __be16 port, u32 flags)
374 struct udp_port_cfg udp_conf;
377 memset(&udp_conf, 0, sizeof(udp_conf));
380 udp_conf.family = AF_INET6;
381 udp_conf.ipv6_v6only = 1;
382 udp_conf.use_udp6_rx_checksums =
383 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
385 udp_conf.family = AF_INET;
386 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
389 udp_conf.local_udp_port = port;
391 /* Open UDP socket */
392 err = udp_sock_create(net, &udp_conf, &sock);
399 static int geneve_hlen(struct genevehdr *gh)
401 return sizeof(*gh) + gh->opt_len * 4;
404 static struct sk_buff **geneve_gro_receive(struct sock *sk,
405 struct sk_buff **head,
408 struct sk_buff *p, **pp = NULL;
409 struct genevehdr *gh, *gh2;
410 unsigned int hlen, gh_len, off_gnv;
411 const struct packet_offload *ptype;
415 off_gnv = skb_gro_offset(skb);
416 hlen = off_gnv + sizeof(*gh);
417 gh = skb_gro_header_fast(skb, off_gnv);
418 if (skb_gro_header_hard(skb, hlen)) {
419 gh = skb_gro_header_slow(skb, hlen, off_gnv);
424 if (gh->ver != GENEVE_VER || gh->oam)
426 gh_len = geneve_hlen(gh);
428 hlen = off_gnv + gh_len;
429 if (skb_gro_header_hard(skb, hlen)) {
430 gh = skb_gro_header_slow(skb, hlen, off_gnv);
435 for (p = *head; p; p = p->next) {
436 if (!NAPI_GRO_CB(p)->same_flow)
439 gh2 = (struct genevehdr *)(p->data + off_gnv);
440 if (gh->opt_len != gh2->opt_len ||
441 memcmp(gh, gh2, gh_len)) {
442 NAPI_GRO_CB(p)->same_flow = 0;
447 type = gh->proto_type;
450 ptype = gro_find_receive_by_type(type);
454 skb_gro_pull(skb, gh_len);
455 skb_gro_postpull_rcsum(skb, gh, gh_len);
456 pp = ptype->callbacks.gro_receive(head, skb);
462 NAPI_GRO_CB(skb)->flush |= flush;
467 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
470 struct genevehdr *gh;
471 struct packet_offload *ptype;
476 gh = (struct genevehdr *)(skb->data + nhoff);
477 gh_len = geneve_hlen(gh);
478 type = gh->proto_type;
481 ptype = gro_find_complete_by_type(type);
483 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
487 skb_set_inner_mac_header(skb, nhoff + gh_len);
492 /* Create new listen socket if needed */
493 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
494 bool ipv6, u32 flags)
496 struct geneve_net *gn = net_generic(net, geneve_net_id);
497 struct geneve_sock *gs;
499 struct udp_tunnel_sock_cfg tunnel_cfg;
502 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
504 return ERR_PTR(-ENOMEM);
506 sock = geneve_create_sock(net, ipv6, port, flags);
509 return ERR_CAST(sock);
514 for (h = 0; h < VNI_HASH_SIZE; ++h)
515 INIT_HLIST_HEAD(&gs->vni_list[h]);
517 /* Initialize the geneve udp offloads structure */
518 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
520 /* Mark socket as an encapsulation socket */
521 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
522 tunnel_cfg.sk_user_data = gs;
523 tunnel_cfg.encap_type = 1;
524 tunnel_cfg.gro_receive = geneve_gro_receive;
525 tunnel_cfg.gro_complete = geneve_gro_complete;
526 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
527 tunnel_cfg.encap_destroy = NULL;
528 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
529 list_add(&gs->list, &gn->sock_list);
533 static void __geneve_sock_release(struct geneve_sock *gs)
535 if (!gs || --gs->refcnt)
539 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
540 udp_tunnel_sock_release(gs->sock);
544 static void geneve_sock_release(struct geneve_dev *geneve)
546 __geneve_sock_release(geneve->sock4);
547 #if IS_ENABLED(CONFIG_IPV6)
548 __geneve_sock_release(geneve->sock6);
552 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
556 struct geneve_sock *gs;
558 list_for_each_entry(gs, &gn->sock_list, list) {
559 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
560 geneve_get_sk_family(gs) == family) {
567 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
569 struct net *net = geneve->net;
570 struct geneve_net *gn = net_generic(net, geneve_net_id);
571 struct geneve_sock *gs;
574 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
580 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
585 gs->collect_md = geneve->collect_md;
586 gs->flags = geneve->flags;
587 #if IS_ENABLED(CONFIG_IPV6)
594 hash = geneve_net_vni_hash(geneve->vni);
595 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
599 static int geneve_open(struct net_device *dev)
601 struct geneve_dev *geneve = netdev_priv(dev);
602 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
603 bool metadata = geneve->collect_md;
606 geneve->sock4 = NULL;
607 #if IS_ENABLED(CONFIG_IPV6)
608 geneve->sock6 = NULL;
609 if (ipv6 || metadata)
610 ret = geneve_sock_add(geneve, true);
612 if (!ret && (!ipv6 || metadata))
613 ret = geneve_sock_add(geneve, false);
615 geneve_sock_release(geneve);
620 static int geneve_stop(struct net_device *dev)
622 struct geneve_dev *geneve = netdev_priv(dev);
624 if (!hlist_unhashed(&geneve->hlist))
625 hlist_del_rcu(&geneve->hlist);
626 geneve_sock_release(geneve);
630 static void geneve_build_header(struct genevehdr *geneveh,
631 __be16 tun_flags, u8 vni[3],
632 u8 options_len, u8 *options)
634 geneveh->ver = GENEVE_VER;
635 geneveh->opt_len = options_len / 4;
636 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
637 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
639 memcpy(geneveh->vni, vni, 3);
640 geneveh->proto_type = htons(ETH_P_TEB);
643 memcpy(geneveh->options, options, options_len);
646 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
647 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
648 u32 flags, bool xnet)
650 struct genevehdr *gnvh;
653 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
655 skb_scrub_packet(skb, xnet);
657 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
658 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
659 err = skb_cow_head(skb, min_headroom);
663 err = udp_tunnel_handle_offloads(skb, udp_sum);
667 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
668 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
670 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
678 #if IS_ENABLED(CONFIG_IPV6)
679 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
680 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
681 u32 flags, bool xnet)
683 struct genevehdr *gnvh;
686 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
688 skb_scrub_packet(skb, xnet);
690 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
691 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
692 err = skb_cow_head(skb, min_headroom);
696 err = udp_tunnel_handle_offloads(skb, udp_sum);
700 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
701 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
703 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
712 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
713 struct net_device *dev,
715 struct ip_tunnel_info *info)
717 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
718 struct geneve_dev *geneve = netdev_priv(dev);
719 struct dst_cache *dst_cache;
720 struct rtable *rt = NULL;
723 memset(fl4, 0, sizeof(*fl4));
724 fl4->flowi4_mark = skb->mark;
725 fl4->flowi4_proto = IPPROTO_UDP;
728 fl4->daddr = info->key.u.ipv4.dst;
729 fl4->saddr = info->key.u.ipv4.src;
730 fl4->flowi4_tos = RT_TOS(info->key.tos);
731 dst_cache = &info->dst_cache;
735 const struct iphdr *iip = ip_hdr(skb);
737 tos = ip_tunnel_get_dsfield(iip, skb);
741 fl4->flowi4_tos = RT_TOS(tos);
742 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
743 dst_cache = &geneve->dst_cache;
747 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
752 rt = ip_route_output_key(geneve->net, fl4);
754 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
755 return ERR_PTR(-ENETUNREACH);
757 if (rt->dst.dev == dev) { /* is this necessary? */
758 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
760 return ERR_PTR(-ELOOP);
763 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
767 #if IS_ENABLED(CONFIG_IPV6)
768 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
769 struct net_device *dev,
771 struct ip_tunnel_info *info)
773 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
774 struct geneve_dev *geneve = netdev_priv(dev);
775 struct geneve_sock *gs6 = geneve->sock6;
776 struct dst_entry *dst = NULL;
777 struct dst_cache *dst_cache;
780 memset(fl6, 0, sizeof(*fl6));
781 fl6->flowi6_mark = skb->mark;
782 fl6->flowi6_proto = IPPROTO_UDP;
785 fl6->daddr = info->key.u.ipv6.dst;
786 fl6->saddr = info->key.u.ipv6.src;
787 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
789 dst_cache = &info->dst_cache;
793 const struct iphdr *iip = ip_hdr(skb);
795 prio = ip_tunnel_get_dsfield(iip, skb);
799 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
801 fl6->daddr = geneve->remote.sin6.sin6_addr;
802 dst_cache = &geneve->dst_cache;
806 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
811 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
812 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
813 return ERR_PTR(-ENETUNREACH);
815 if (dst->dev == dev) { /* is this necessary? */
816 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
818 return ERR_PTR(-ELOOP);
822 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
827 /* Convert 64 bit tunnel ID to 24 bit VNI. */
828 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
831 vni[0] = (__force __u8)(tun_id >> 16);
832 vni[1] = (__force __u8)(tun_id >> 8);
833 vni[2] = (__force __u8)tun_id;
835 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
836 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
837 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
841 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
842 struct ip_tunnel_info *info)
844 struct geneve_dev *geneve = netdev_priv(dev);
845 struct geneve_sock *gs4 = geneve->sock4;
846 struct rtable *rt = NULL;
847 const struct iphdr *iip; /* interior IP header */
853 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
854 u32 flags = geneve->flags;
856 if (geneve->collect_md) {
857 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
858 netdev_dbg(dev, "no tunnel metadata\n");
861 if (info && ip_tunnel_info_af(info) != AF_INET)
865 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
871 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
872 skb_reset_mac_header(skb);
877 const struct ip_tunnel_key *key = &info->key;
881 tunnel_id_to_vni(key->tun_id, vni);
882 if (info->options_len)
883 opts = ip_tunnel_info_opts(info);
885 if (key->tun_flags & TUNNEL_CSUM)
886 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
888 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
890 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
891 info->options_len, opts, flags, xnet);
895 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
897 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
899 err = geneve_build_skb(rt, skb, 0, geneve->vni,
900 0, NULL, flags, xnet);
904 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
906 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
908 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
911 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
912 tos, ttl, df, sport, geneve->dst_port,
913 !net_eq(geneve->net, dev_net(geneve->dev)),
914 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
922 dev->stats.collisions++;
923 else if (err == -ENETUNREACH)
924 dev->stats.tx_carrier_errors++;
926 dev->stats.tx_errors++;
930 #if IS_ENABLED(CONFIG_IPV6)
931 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
932 struct ip_tunnel_info *info)
934 struct geneve_dev *geneve = netdev_priv(dev);
935 struct geneve_sock *gs6 = geneve->sock6;
936 struct dst_entry *dst = NULL;
937 const struct iphdr *iip; /* interior IP header */
943 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
944 u32 flags = geneve->flags;
946 if (geneve->collect_md) {
947 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
948 netdev_dbg(dev, "no tunnel metadata\n");
953 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
959 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
960 skb_reset_mac_header(skb);
965 const struct ip_tunnel_key *key = &info->key;
969 tunnel_id_to_vni(key->tun_id, vni);
970 if (info->options_len)
971 opts = ip_tunnel_info_opts(info);
973 if (key->tun_flags & TUNNEL_CSUM)
974 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
976 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
978 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
979 info->options_len, opts,
984 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
986 label = info->key.label;
988 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
989 0, NULL, flags, xnet);
993 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
996 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
998 ttl = ttl ? : ip6_dst_hoplimit(dst);
999 label = geneve->label;
1002 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1003 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1004 sport, geneve->dst_port,
1005 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1006 return NETDEV_TX_OK;
1012 dev->stats.collisions++;
1013 else if (err == -ENETUNREACH)
1014 dev->stats.tx_carrier_errors++;
1016 dev->stats.tx_errors++;
1017 return NETDEV_TX_OK;
1021 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1023 struct geneve_dev *geneve = netdev_priv(dev);
1024 struct ip_tunnel_info *info = NULL;
1026 if (geneve->collect_md)
1027 info = skb_tunnel_info(skb);
1029 #if IS_ENABLED(CONFIG_IPV6)
1030 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1031 (!info && geneve->remote.sa.sa_family == AF_INET6))
1032 return geneve6_xmit_skb(skb, dev, info);
1034 return geneve_xmit_skb(skb, dev, info);
1037 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1039 /* Only possible if called internally, ndo_change_mtu path's new_mtu
1040 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
1042 if (new_mtu > dev->max_mtu)
1043 new_mtu = dev->max_mtu;
1049 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1051 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1052 struct geneve_dev *geneve = netdev_priv(dev);
1055 #if IS_ENABLED(CONFIG_IPV6)
1056 struct dst_entry *dst;
1060 if (ip_tunnel_info_af(info) == AF_INET) {
1061 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1066 info->key.u.ipv4.src = fl4.saddr;
1067 #if IS_ENABLED(CONFIG_IPV6)
1068 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1069 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1071 return PTR_ERR(dst);
1074 info->key.u.ipv6.src = fl6.saddr;
1080 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1081 1, USHRT_MAX, true);
1082 info->key.tp_dst = geneve->dst_port;
1086 static const struct net_device_ops geneve_netdev_ops = {
1087 .ndo_init = geneve_init,
1088 .ndo_uninit = geneve_uninit,
1089 .ndo_open = geneve_open,
1090 .ndo_stop = geneve_stop,
1091 .ndo_start_xmit = geneve_xmit,
1092 .ndo_get_stats64 = ip_tunnel_get_stats64,
1093 .ndo_change_mtu = geneve_change_mtu,
1094 .ndo_validate_addr = eth_validate_addr,
1095 .ndo_set_mac_address = eth_mac_addr,
1096 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1099 static void geneve_get_drvinfo(struct net_device *dev,
1100 struct ethtool_drvinfo *drvinfo)
1102 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1103 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1106 static const struct ethtool_ops geneve_ethtool_ops = {
1107 .get_drvinfo = geneve_get_drvinfo,
1108 .get_link = ethtool_op_get_link,
1111 /* Info for udev, that this is a virtual tunnel endpoint */
1112 static struct device_type geneve_type = {
1116 /* Calls the ndo_udp_tunnel_add of the caller in order to
1117 * supply the listening GENEVE udp ports. Callers are expected
1118 * to implement the ndo_udp_tunnel_add.
1120 static void geneve_push_rx_ports(struct net_device *dev)
1122 struct net *net = dev_net(dev);
1123 struct geneve_net *gn = net_generic(net, geneve_net_id);
1124 struct geneve_sock *gs;
1127 list_for_each_entry_rcu(gs, &gn->sock_list, list)
1128 udp_tunnel_push_rx_port(dev, gs->sock,
1129 UDP_TUNNEL_TYPE_GENEVE);
1133 /* Initialize the device structure. */
1134 static void geneve_setup(struct net_device *dev)
1138 dev->netdev_ops = &geneve_netdev_ops;
1139 dev->ethtool_ops = &geneve_ethtool_ops;
1140 dev->destructor = free_netdev;
1142 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1144 dev->features |= NETIF_F_LLTX;
1145 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1146 dev->features |= NETIF_F_RXCSUM;
1147 dev->features |= NETIF_F_GSO_SOFTWARE;
1149 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1150 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1152 /* MTU range: 68 - (something less than 65535) */
1153 dev->min_mtu = ETH_MIN_MTU;
1154 /* The max_mtu calculation does not take account of GENEVE
1155 * options, to avoid excluding potentially valid
1156 * configurations. This will be further reduced by IPvX hdr size.
1158 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1160 netif_keep_dst(dev);
1161 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1162 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1163 eth_hw_addr_random(dev);
1166 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1167 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1168 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1169 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1170 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1171 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1172 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1173 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1174 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1175 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1176 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1177 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1180 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1182 if (tb[IFLA_ADDRESS]) {
1183 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1186 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1187 return -EADDRNOTAVAIL;
1193 if (data[IFLA_GENEVE_ID]) {
1194 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1196 if (vni >= GENEVE_VID_MASK)
1203 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1205 union geneve_addr *remote,
1207 bool *tun_on_same_port,
1208 bool *tun_collect_md)
1210 struct geneve_dev *geneve, *t;
1212 *tun_on_same_port = false;
1213 *tun_collect_md = false;
1215 list_for_each_entry(geneve, &gn->geneve_list, next) {
1216 if (geneve->dst_port == dst_port) {
1217 *tun_collect_md = geneve->collect_md;
1218 *tun_on_same_port = true;
1220 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1221 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1222 dst_port == geneve->dst_port)
1228 static int geneve_configure(struct net *net, struct net_device *dev,
1229 union geneve_addr *remote,
1230 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1231 __be16 dst_port, bool metadata, u32 flags)
1233 struct geneve_net *gn = net_generic(net, geneve_net_id);
1234 struct geneve_dev *t, *geneve = netdev_priv(dev);
1235 bool tun_collect_md, tun_on_same_port;
1241 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1247 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1248 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1249 geneve->vni[2] = vni & 0x000000ff;
1251 if ((remote->sa.sa_family == AF_INET &&
1252 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1253 (remote->sa.sa_family == AF_INET6 &&
1254 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1256 if (label && remote->sa.sa_family != AF_INET6)
1259 geneve->remote = *remote;
1263 geneve->label = label;
1264 geneve->dst_port = dst_port;
1265 geneve->collect_md = metadata;
1266 geneve->flags = flags;
1268 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1269 &tun_on_same_port, &tun_collect_md);
1273 /* make enough headroom for basic scenario */
1274 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1275 if (remote->sa.sa_family == AF_INET) {
1276 encap_len += sizeof(struct iphdr);
1277 dev->max_mtu -= sizeof(struct iphdr);
1279 encap_len += sizeof(struct ipv6hdr);
1280 dev->max_mtu -= sizeof(struct ipv6hdr);
1282 dev->needed_headroom = encap_len + ETH_HLEN;
1285 if (tun_on_same_port)
1292 dst_cache_reset(&geneve->dst_cache);
1294 err = register_netdevice(dev);
1298 list_add(&geneve->next, &gn->geneve_list);
1302 static int geneve_newlink(struct net *net, struct net_device *dev,
1303 struct nlattr *tb[], struct nlattr *data[])
1305 __be16 dst_port = htons(GENEVE_UDP_PORT);
1306 __u8 ttl = 0, tos = 0;
1307 bool metadata = false;
1308 union geneve_addr remote = geneve_remote_unspec;
1313 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1316 if (data[IFLA_GENEVE_REMOTE]) {
1317 remote.sa.sa_family = AF_INET;
1318 remote.sin.sin_addr.s_addr =
1319 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1322 if (data[IFLA_GENEVE_REMOTE6]) {
1323 if (!IS_ENABLED(CONFIG_IPV6))
1324 return -EPFNOSUPPORT;
1326 remote.sa.sa_family = AF_INET6;
1327 remote.sin6.sin6_addr =
1328 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1330 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1331 IPV6_ADDR_LINKLOCAL) {
1332 netdev_dbg(dev, "link-local remote is unsupported\n");
1337 if (data[IFLA_GENEVE_ID])
1338 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1340 if (data[IFLA_GENEVE_TTL])
1341 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1343 if (data[IFLA_GENEVE_TOS])
1344 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1346 if (data[IFLA_GENEVE_LABEL])
1347 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1348 IPV6_FLOWLABEL_MASK;
1350 if (data[IFLA_GENEVE_PORT])
1351 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1353 if (data[IFLA_GENEVE_COLLECT_METADATA])
1356 if (data[IFLA_GENEVE_UDP_CSUM] &&
1357 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1358 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1360 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1361 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1362 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1364 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1365 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1366 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1368 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1369 dst_port, metadata, flags);
1372 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1374 struct geneve_dev *geneve = netdev_priv(dev);
1376 list_del(&geneve->next);
1377 unregister_netdevice_queue(dev, head);
1380 static size_t geneve_get_size(const struct net_device *dev)
1382 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1383 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1384 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1385 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1386 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1387 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1388 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1389 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1390 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1391 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1395 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1397 struct geneve_dev *geneve = netdev_priv(dev);
1400 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1401 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1402 goto nla_put_failure;
1404 if (geneve->remote.sa.sa_family == AF_INET) {
1405 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1406 geneve->remote.sin.sin_addr.s_addr))
1407 goto nla_put_failure;
1408 #if IS_ENABLED(CONFIG_IPV6)
1410 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1411 &geneve->remote.sin6.sin6_addr))
1412 goto nla_put_failure;
1416 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1417 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1418 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1419 goto nla_put_failure;
1421 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1422 goto nla_put_failure;
1424 if (geneve->collect_md) {
1425 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1426 goto nla_put_failure;
1429 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1430 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1431 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1432 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1433 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1434 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1435 goto nla_put_failure;
1443 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1445 .maxtype = IFLA_GENEVE_MAX,
1446 .policy = geneve_policy,
1447 .priv_size = sizeof(struct geneve_dev),
1448 .setup = geneve_setup,
1449 .validate = geneve_validate,
1450 .newlink = geneve_newlink,
1451 .dellink = geneve_dellink,
1452 .get_size = geneve_get_size,
1453 .fill_info = geneve_fill_info,
1456 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1457 u8 name_assign_type, u16 dst_port)
1459 struct nlattr *tb[IFLA_MAX + 1];
1460 struct net_device *dev;
1461 LIST_HEAD(list_kill);
1464 memset(tb, 0, sizeof(tb));
1465 dev = rtnl_create_link(net, name, name_assign_type,
1466 &geneve_link_ops, tb);
1470 err = geneve_configure(net, dev, &geneve_remote_unspec,
1471 0, 0, 0, 0, htons(dst_port), true,
1472 GENEVE_F_UDP_ZERO_CSUM6_RX);
1475 return ERR_PTR(err);
1478 /* openvswitch users expect packet sizes to be unrestricted,
1479 * so set the largest MTU we can.
1481 err = geneve_change_mtu(dev, IP_MAX_MTU);
1485 err = rtnl_configure_link(dev, NULL);
1492 geneve_dellink(dev, &list_kill);
1493 unregister_netdevice_many(&list_kill);
1494 return ERR_PTR(err);
1496 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1498 static int geneve_netdevice_event(struct notifier_block *unused,
1499 unsigned long event, void *ptr)
1501 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1503 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1504 geneve_push_rx_ports(dev);
1509 static struct notifier_block geneve_notifier_block __read_mostly = {
1510 .notifier_call = geneve_netdevice_event,
1513 static __net_init int geneve_init_net(struct net *net)
1515 struct geneve_net *gn = net_generic(net, geneve_net_id);
1517 INIT_LIST_HEAD(&gn->geneve_list);
1518 INIT_LIST_HEAD(&gn->sock_list);
1522 static void __net_exit geneve_exit_net(struct net *net)
1524 struct geneve_net *gn = net_generic(net, geneve_net_id);
1525 struct geneve_dev *geneve, *next;
1526 struct net_device *dev, *aux;
1531 /* gather any geneve devices that were moved into this ns */
1532 for_each_netdev_safe(net, dev, aux)
1533 if (dev->rtnl_link_ops == &geneve_link_ops)
1534 unregister_netdevice_queue(dev, &list);
1536 /* now gather any other geneve devices that were created in this ns */
1537 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1538 /* If geneve->dev is in the same netns, it was already added
1539 * to the list by the previous loop.
1541 if (!net_eq(dev_net(geneve->dev), net))
1542 unregister_netdevice_queue(geneve->dev, &list);
1545 /* unregister the devices gathered above */
1546 unregister_netdevice_many(&list);
1550 static struct pernet_operations geneve_net_ops = {
1551 .init = geneve_init_net,
1552 .exit = geneve_exit_net,
1553 .id = &geneve_net_id,
1554 .size = sizeof(struct geneve_net),
1557 static int __init geneve_init_module(void)
1561 rc = register_pernet_subsys(&geneve_net_ops);
1565 rc = register_netdevice_notifier(&geneve_notifier_block);
1569 rc = rtnl_link_register(&geneve_link_ops);
1576 unregister_netdevice_notifier(&geneve_notifier_block);
1578 unregister_pernet_subsys(&geneve_net_ops);
1582 late_initcall(geneve_init_module);
1584 static void __exit geneve_cleanup_module(void)
1586 rtnl_link_unregister(&geneve_link_ops);
1587 unregister_netdevice_notifier(&geneve_notifier_block);
1588 unregister_pernet_subsys(&geneve_net_ops);
1590 module_exit(geneve_cleanup_module);
1592 MODULE_LICENSE("GPL");
1593 MODULE_VERSION(GENEVE_NETDEV_VER);
1594 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1595 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1596 MODULE_ALIAS_RTNL_LINK("geneve");