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 unsigned int geneve_net_id;
48 struct geneve_dev_node {
49 struct hlist_node hlist;
50 struct geneve_dev *geneve;
53 /* Pseudo network device */
55 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
56 #if IS_ENABLED(CONFIG_IPV6)
57 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
59 struct net *net; /* netns for packet i/o */
60 struct net_device *dev; /* netdev for geneve tunnel */
61 struct ip_tunnel_info info;
62 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
63 #if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
66 struct list_head next; /* geneve's per namespace list */
67 struct gro_cells gro_cells;
69 bool use_udp6_rx_checksums;
74 struct list_head list;
78 struct hlist_head vni_list[VNI_HASH_SIZE];
81 static inline __u32 geneve_net_vni_hash(u8 vni[3])
85 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
86 return hash_32(vnid, VNI_HASH_BITS);
89 static __be64 vni_to_tunnel_id(const __u8 *vni)
92 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
94 return (__force __be64)(((__force u64)vni[0] << 40) |
95 ((__force u64)vni[1] << 48) |
96 ((__force u64)vni[2] << 56));
100 /* Convert 64 bit tunnel ID to 24 bit VNI. */
101 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
104 vni[0] = (__force __u8)(tun_id >> 16);
105 vni[1] = (__force __u8)(tun_id >> 8);
106 vni[2] = (__force __u8)tun_id;
108 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
109 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
110 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
114 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
116 return !memcmp(vni, &tun_id[5], 3);
119 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
121 return gs->sock->sk->sk_family;
124 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
125 __be32 addr, u8 vni[])
127 struct hlist_head *vni_list_head;
128 struct geneve_dev_node *node;
131 /* Find the device for this VNI */
132 hash = geneve_net_vni_hash(vni);
133 vni_list_head = &gs->vni_list[hash];
134 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
135 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
136 addr == node->geneve->info.key.u.ipv4.dst)
142 #if IS_ENABLED(CONFIG_IPV6)
143 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
144 struct in6_addr addr6, u8 vni[])
146 struct hlist_head *vni_list_head;
147 struct geneve_dev_node *node;
150 /* Find the device for this VNI */
151 hash = geneve_net_vni_hash(vni);
152 vni_list_head = &gs->vni_list[hash];
153 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
154 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
155 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
162 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
164 return (struct genevehdr *)(udp_hdr(skb) + 1);
167 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
170 static u8 zero_vni[3];
173 if (geneve_get_sk_family(gs) == AF_INET) {
177 iph = ip_hdr(skb); /* outer IP header... */
179 if (gs->collect_md) {
183 vni = geneve_hdr(skb)->vni;
187 return geneve_lookup(gs, addr, vni);
188 #if IS_ENABLED(CONFIG_IPV6)
189 } else if (geneve_get_sk_family(gs) == AF_INET6) {
190 static struct in6_addr zero_addr6;
191 struct ipv6hdr *ip6h;
192 struct in6_addr addr6;
194 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
196 if (gs->collect_md) {
200 vni = geneve_hdr(skb)->vni;
204 return geneve6_lookup(gs, addr6, vni);
210 /* geneve receive/decap routine */
211 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
214 struct genevehdr *gnvh = geneve_hdr(skb);
215 struct metadata_dst *tun_dst = NULL;
216 struct pcpu_sw_netstats *stats;
221 if (ip_tunnel_collect_metadata() || gs->collect_md) {
224 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
225 (gnvh->oam ? TUNNEL_OAM : 0) |
226 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
228 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
229 vni_to_tunnel_id(gnvh->vni),
232 geneve->dev->stats.rx_dropped++;
235 /* Update tunnel dst according to Geneve options. */
236 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
237 gnvh->options, gnvh->opt_len * 4);
239 /* Drop packets w/ critical options,
240 * since we don't support any...
242 if (gnvh->critical) {
243 geneve->dev->stats.rx_frame_errors++;
244 geneve->dev->stats.rx_errors++;
249 skb_reset_mac_header(skb);
250 skb->protocol = eth_type_trans(skb, geneve->dev);
251 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
254 skb_dst_set(skb, &tun_dst->dst);
256 /* Ignore packet loops (and multicast echo) */
257 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
258 geneve->dev->stats.rx_errors++;
262 oiph = skb_network_header(skb);
263 skb_reset_network_header(skb);
265 if (geneve_get_sk_family(gs) == AF_INET)
266 err = IP_ECN_decapsulate(oiph, skb);
267 #if IS_ENABLED(CONFIG_IPV6)
269 err = IP6_ECN_decapsulate(oiph, skb);
274 if (geneve_get_sk_family(gs) == AF_INET)
275 net_info_ratelimited("non-ECT from %pI4 "
277 &((struct iphdr *)oiph)->saddr,
278 ((struct iphdr *)oiph)->tos);
279 #if IS_ENABLED(CONFIG_IPV6)
281 net_info_ratelimited("non-ECT from %pI6\n",
282 &((struct ipv6hdr *)oiph)->saddr);
286 ++geneve->dev->stats.rx_frame_errors;
287 ++geneve->dev->stats.rx_errors;
293 err = gro_cells_receive(&geneve->gro_cells, skb);
294 if (likely(err == NET_RX_SUCCESS)) {
295 stats = this_cpu_ptr(geneve->dev->tstats);
296 u64_stats_update_begin(&stats->syncp);
298 stats->rx_bytes += len;
299 u64_stats_update_end(&stats->syncp);
303 /* Consume bad packet */
307 /* Setup stats when device is created */
308 static int geneve_init(struct net_device *dev)
310 struct geneve_dev *geneve = netdev_priv(dev);
313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
317 err = gro_cells_init(&geneve->gro_cells, dev);
319 free_percpu(dev->tstats);
323 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
325 free_percpu(dev->tstats);
326 gro_cells_destroy(&geneve->gro_cells);
332 static void geneve_uninit(struct net_device *dev)
334 struct geneve_dev *geneve = netdev_priv(dev);
336 dst_cache_destroy(&geneve->info.dst_cache);
337 gro_cells_destroy(&geneve->gro_cells);
338 free_percpu(dev->tstats);
341 /* Callback from net/ipv4/udp.c to receive packets */
342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
344 struct genevehdr *geneveh;
345 struct geneve_dev *geneve;
346 struct geneve_sock *gs;
349 /* Need UDP and Geneve header to be present */
350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
353 /* Return packets with reserved bits set */
354 geneveh = geneve_hdr(skb);
355 if (unlikely(geneveh->ver != GENEVE_VER))
358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
361 gs = rcu_dereference_sk_user_data(sk);
365 geneve = geneve_lookup_skb(gs, skb);
369 opts_len = geneveh->opt_len * 4;
370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
372 !net_eq(geneve->net, dev_net(geneve->dev)))) {
373 geneve->dev->stats.rx_dropped++;
377 geneve_rx(geneve, gs, skb);
381 /* Consume bad packet */
386 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
387 __be16 port, bool ipv6_rx_csum)
390 struct udp_port_cfg udp_conf;
393 memset(&udp_conf, 0, sizeof(udp_conf));
396 udp_conf.family = AF_INET6;
397 udp_conf.ipv6_v6only = 1;
398 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
400 udp_conf.family = AF_INET;
401 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
404 udp_conf.local_udp_port = port;
406 /* Open UDP socket */
407 err = udp_sock_create(net, &udp_conf, &sock);
414 static int geneve_hlen(struct genevehdr *gh)
416 return sizeof(*gh) + gh->opt_len * 4;
419 static struct sk_buff **geneve_gro_receive(struct sock *sk,
420 struct sk_buff **head,
423 struct sk_buff *p, **pp = NULL;
424 struct genevehdr *gh, *gh2;
425 unsigned int hlen, gh_len, off_gnv;
426 const struct packet_offload *ptype;
430 off_gnv = skb_gro_offset(skb);
431 hlen = off_gnv + sizeof(*gh);
432 gh = skb_gro_header_fast(skb, off_gnv);
433 if (skb_gro_header_hard(skb, hlen)) {
434 gh = skb_gro_header_slow(skb, hlen, off_gnv);
439 if (gh->ver != GENEVE_VER || gh->oam)
441 gh_len = geneve_hlen(gh);
443 hlen = off_gnv + gh_len;
444 if (skb_gro_header_hard(skb, hlen)) {
445 gh = skb_gro_header_slow(skb, hlen, off_gnv);
450 for (p = *head; p; p = p->next) {
451 if (!NAPI_GRO_CB(p)->same_flow)
454 gh2 = (struct genevehdr *)(p->data + off_gnv);
455 if (gh->opt_len != gh2->opt_len ||
456 memcmp(gh, gh2, gh_len)) {
457 NAPI_GRO_CB(p)->same_flow = 0;
462 type = gh->proto_type;
465 ptype = gro_find_receive_by_type(type);
469 skb_gro_pull(skb, gh_len);
470 skb_gro_postpull_rcsum(skb, gh, gh_len);
471 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
477 skb_gro_flush_final(skb, pp, flush);
482 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
485 struct genevehdr *gh;
486 struct packet_offload *ptype;
491 gh = (struct genevehdr *)(skb->data + nhoff);
492 gh_len = geneve_hlen(gh);
493 type = gh->proto_type;
496 ptype = gro_find_complete_by_type(type);
498 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
502 skb_set_inner_mac_header(skb, nhoff + gh_len);
507 /* Create new listen socket if needed */
508 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
509 bool ipv6, bool ipv6_rx_csum)
511 struct geneve_net *gn = net_generic(net, geneve_net_id);
512 struct geneve_sock *gs;
514 struct udp_tunnel_sock_cfg tunnel_cfg;
517 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
519 return ERR_PTR(-ENOMEM);
521 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
524 return ERR_CAST(sock);
529 for (h = 0; h < VNI_HASH_SIZE; ++h)
530 INIT_HLIST_HEAD(&gs->vni_list[h]);
532 /* Initialize the geneve udp offloads structure */
533 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
535 /* Mark socket as an encapsulation socket */
536 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
537 tunnel_cfg.sk_user_data = gs;
538 tunnel_cfg.encap_type = 1;
539 tunnel_cfg.gro_receive = geneve_gro_receive;
540 tunnel_cfg.gro_complete = geneve_gro_complete;
541 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
542 tunnel_cfg.encap_destroy = NULL;
543 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
544 list_add(&gs->list, &gn->sock_list);
548 static void __geneve_sock_release(struct geneve_sock *gs)
550 if (!gs || --gs->refcnt)
554 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
555 udp_tunnel_sock_release(gs->sock);
559 static void geneve_sock_release(struct geneve_dev *geneve)
561 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
562 #if IS_ENABLED(CONFIG_IPV6)
563 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
565 rcu_assign_pointer(geneve->sock6, NULL);
568 rcu_assign_pointer(geneve->sock4, NULL);
571 __geneve_sock_release(gs4);
572 #if IS_ENABLED(CONFIG_IPV6)
573 __geneve_sock_release(gs6);
577 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
581 struct geneve_sock *gs;
583 list_for_each_entry(gs, &gn->sock_list, list) {
584 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
585 geneve_get_sk_family(gs) == family) {
592 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
594 struct net *net = geneve->net;
595 struct geneve_net *gn = net_generic(net, geneve_net_id);
596 struct geneve_dev_node *node;
597 struct geneve_sock *gs;
601 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
607 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
608 geneve->use_udp6_rx_checksums);
613 gs->collect_md = geneve->collect_md;
614 #if IS_ENABLED(CONFIG_IPV6)
616 rcu_assign_pointer(geneve->sock6, gs);
617 node = &geneve->hlist6;
621 rcu_assign_pointer(geneve->sock4, gs);
622 node = &geneve->hlist4;
624 node->geneve = geneve;
626 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
627 hash = geneve_net_vni_hash(vni);
628 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
632 static int geneve_open(struct net_device *dev)
634 struct geneve_dev *geneve = netdev_priv(dev);
635 bool metadata = geneve->collect_md;
639 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
640 ipv4 = !ipv6 || metadata;
641 #if IS_ENABLED(CONFIG_IPV6)
643 ret = geneve_sock_add(geneve, true);
644 if (ret < 0 && ret != -EAFNOSUPPORT)
649 ret = geneve_sock_add(geneve, false);
651 geneve_sock_release(geneve);
656 static int geneve_stop(struct net_device *dev)
658 struct geneve_dev *geneve = netdev_priv(dev);
660 hlist_del_init_rcu(&geneve->hlist4.hlist);
661 #if IS_ENABLED(CONFIG_IPV6)
662 hlist_del_init_rcu(&geneve->hlist6.hlist);
664 geneve_sock_release(geneve);
668 static void geneve_build_header(struct genevehdr *geneveh,
669 const struct ip_tunnel_info *info)
671 geneveh->ver = GENEVE_VER;
672 geneveh->opt_len = info->options_len / 4;
673 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
674 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
676 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
677 geneveh->proto_type = htons(ETH_P_TEB);
680 ip_tunnel_info_opts_get(geneveh->options, info);
683 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
684 const struct ip_tunnel_info *info,
685 bool xnet, int ip_hdr_len)
687 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
688 struct genevehdr *gnvh;
692 skb_reset_mac_header(skb);
693 skb_scrub_packet(skb, xnet);
695 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
696 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
697 err = skb_cow_head(skb, min_headroom);
701 err = udp_tunnel_handle_offloads(skb, udp_sum);
705 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
706 geneve_build_header(gnvh, info);
707 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
715 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
716 struct net_device *dev,
717 struct geneve_sock *gs4,
719 const struct ip_tunnel_info *info,
720 __be16 dport, __be16 sport)
722 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
723 struct geneve_dev *geneve = netdev_priv(dev);
724 struct dst_cache *dst_cache;
725 struct rtable *rt = NULL;
729 return ERR_PTR(-EIO);
731 memset(fl4, 0, sizeof(*fl4));
732 fl4->flowi4_mark = skb->mark;
733 fl4->flowi4_proto = IPPROTO_UDP;
734 fl4->daddr = info->key.u.ipv4.dst;
735 fl4->saddr = info->key.u.ipv4.src;
736 fl4->fl4_dport = dport;
737 fl4->fl4_sport = sport;
740 if ((tos == 1) && !geneve->collect_md) {
741 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
744 fl4->flowi4_tos = RT_TOS(tos);
746 dst_cache = (struct dst_cache *)&info->dst_cache;
748 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,
770 struct geneve_sock *gs6,
772 const struct ip_tunnel_info *info,
773 __be16 dport, __be16 sport)
775 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
776 struct geneve_dev *geneve = netdev_priv(dev);
777 struct dst_entry *dst = NULL;
778 struct dst_cache *dst_cache;
782 return ERR_PTR(-EIO);
784 memset(fl6, 0, sizeof(*fl6));
785 fl6->flowi6_mark = skb->mark;
786 fl6->flowi6_proto = IPPROTO_UDP;
787 fl6->daddr = info->key.u.ipv6.dst;
788 fl6->saddr = info->key.u.ipv6.src;
789 fl6->fl6_dport = dport;
790 fl6->fl6_sport = sport;
792 prio = info->key.tos;
793 if ((prio == 1) && !geneve->collect_md) {
794 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
798 fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
799 dst_cache = (struct dst_cache *)&info->dst_cache;
801 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
805 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
808 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
809 return ERR_PTR(-ENETUNREACH);
811 if (dst->dev == dev) { /* is this necessary? */
812 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
814 return ERR_PTR(-ELOOP);
818 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
823 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
824 struct geneve_dev *geneve,
825 const struct ip_tunnel_info *info)
827 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
828 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
829 const struct ip_tunnel_key *key = &info->key;
837 if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
840 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
841 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
842 geneve->info.key.tp_dst, sport);
847 int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) -
848 GENEVE_BASE_HLEN - info->options_len - 14;
850 skb_dst_update_pmtu(skb, mtu);
853 if (geneve->collect_md) {
854 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
857 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
858 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
860 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
862 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
866 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
867 tos, ttl, df, sport, geneve->info.key.tp_dst,
868 !net_eq(geneve->net, dev_net(geneve->dev)),
869 !(info->key.tun_flags & TUNNEL_CSUM));
873 #if IS_ENABLED(CONFIG_IPV6)
874 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
875 struct geneve_dev *geneve,
876 const struct ip_tunnel_info *info)
878 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
879 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
880 const struct ip_tunnel_key *key = &info->key;
881 struct dst_entry *dst = NULL;
887 if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
890 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
891 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
892 geneve->info.key.tp_dst, sport);
897 int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) -
898 GENEVE_BASE_HLEN - info->options_len - 14;
900 skb_dst_update_pmtu(skb, mtu);
903 if (geneve->collect_md) {
904 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
907 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
909 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
911 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
915 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
916 &fl6.saddr, &fl6.daddr, prio, ttl,
917 info->key.label, sport, geneve->info.key.tp_dst,
918 !(info->key.tun_flags & TUNNEL_CSUM));
923 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
925 struct geneve_dev *geneve = netdev_priv(dev);
926 struct ip_tunnel_info *info = NULL;
929 if (geneve->collect_md) {
930 info = skb_tunnel_info(skb);
931 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
932 netdev_dbg(dev, "no tunnel metadata\n");
934 dev->stats.tx_dropped++;
938 info = &geneve->info;
942 #if IS_ENABLED(CONFIG_IPV6)
943 if (info->mode & IP_TUNNEL_INFO_IPV6)
944 err = geneve6_xmit_skb(skb, dev, geneve, info);
947 err = geneve_xmit_skb(skb, dev, geneve, info);
956 dev->stats.collisions++;
957 else if (err == -ENETUNREACH)
958 dev->stats.tx_carrier_errors++;
960 dev->stats.tx_errors++;
964 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
966 /* Only possible if called internally, ndo_change_mtu path's new_mtu
967 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
969 if (new_mtu > dev->max_mtu)
970 new_mtu = dev->max_mtu;
976 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
978 struct ip_tunnel_info *info = skb_tunnel_info(skb);
979 struct geneve_dev *geneve = netdev_priv(dev);
982 if (ip_tunnel_info_af(info) == AF_INET) {
986 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
987 sport = udp_flow_src_port(geneve->net, skb,
990 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
991 geneve->info.key.tp_dst, sport);
996 info->key.u.ipv4.src = fl4.saddr;
997 #if IS_ENABLED(CONFIG_IPV6)
998 } else if (ip_tunnel_info_af(info) == AF_INET6) {
999 struct dst_entry *dst;
1002 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1003 sport = udp_flow_src_port(geneve->net, skb,
1004 1, USHRT_MAX, true);
1006 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1007 geneve->info.key.tp_dst, sport);
1009 return PTR_ERR(dst);
1012 info->key.u.ipv6.src = fl6.saddr;
1018 info->key.tp_src = sport;
1019 info->key.tp_dst = geneve->info.key.tp_dst;
1023 static const struct net_device_ops geneve_netdev_ops = {
1024 .ndo_init = geneve_init,
1025 .ndo_uninit = geneve_uninit,
1026 .ndo_open = geneve_open,
1027 .ndo_stop = geneve_stop,
1028 .ndo_start_xmit = geneve_xmit,
1029 .ndo_get_stats64 = ip_tunnel_get_stats64,
1030 .ndo_change_mtu = geneve_change_mtu,
1031 .ndo_validate_addr = eth_validate_addr,
1032 .ndo_set_mac_address = eth_mac_addr,
1033 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1036 static void geneve_get_drvinfo(struct net_device *dev,
1037 struct ethtool_drvinfo *drvinfo)
1039 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1040 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1043 static const struct ethtool_ops geneve_ethtool_ops = {
1044 .get_drvinfo = geneve_get_drvinfo,
1045 .get_link = ethtool_op_get_link,
1048 /* Info for udev, that this is a virtual tunnel endpoint */
1049 static struct device_type geneve_type = {
1053 /* Calls the ndo_udp_tunnel_add of the caller in order to
1054 * supply the listening GENEVE udp ports. Callers are expected
1055 * to implement the ndo_udp_tunnel_add.
1057 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1059 struct net *net = dev_net(dev);
1060 struct geneve_net *gn = net_generic(net, geneve_net_id);
1061 struct geneve_sock *gs;
1064 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1066 udp_tunnel_push_rx_port(dev, gs->sock,
1067 UDP_TUNNEL_TYPE_GENEVE);
1069 udp_tunnel_drop_rx_port(dev, gs->sock,
1070 UDP_TUNNEL_TYPE_GENEVE);
1076 /* Initialize the device structure. */
1077 static void geneve_setup(struct net_device *dev)
1081 dev->netdev_ops = &geneve_netdev_ops;
1082 dev->ethtool_ops = &geneve_ethtool_ops;
1083 dev->needs_free_netdev = true;
1085 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1087 dev->features |= NETIF_F_LLTX;
1088 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1089 dev->features |= NETIF_F_RXCSUM;
1090 dev->features |= NETIF_F_GSO_SOFTWARE;
1092 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1093 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1095 /* MTU range: 68 - (something less than 65535) */
1096 dev->min_mtu = ETH_MIN_MTU;
1097 /* The max_mtu calculation does not take account of GENEVE
1098 * options, to avoid excluding potentially valid
1099 * configurations. This will be further reduced by IPvX hdr size.
1101 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1103 netif_keep_dst(dev);
1104 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1105 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1106 eth_hw_addr_random(dev);
1109 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1110 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1111 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1112 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1113 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1114 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1115 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1116 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1117 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1118 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1119 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1120 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1123 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1124 struct netlink_ext_ack *extack)
1126 if (tb[IFLA_ADDRESS]) {
1127 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1128 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1129 "Provided link layer address is not Ethernet");
1133 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1134 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1135 "Provided Ethernet address is not unicast");
1136 return -EADDRNOTAVAIL;
1141 NL_SET_ERR_MSG(extack,
1142 "Not enough attributes provided to perform the operation");
1146 if (data[IFLA_GENEVE_ID]) {
1147 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1149 if (vni >= GENEVE_N_VID) {
1150 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1151 "Geneve ID must be lower than 16777216");
1159 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1160 const struct ip_tunnel_info *info,
1161 bool *tun_on_same_port,
1162 bool *tun_collect_md)
1164 struct geneve_dev *geneve, *t = NULL;
1166 *tun_on_same_port = false;
1167 *tun_collect_md = false;
1168 list_for_each_entry(geneve, &gn->geneve_list, next) {
1169 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1170 *tun_collect_md = geneve->collect_md;
1171 *tun_on_same_port = true;
1173 if (info->key.tun_id == geneve->info.key.tun_id &&
1174 info->key.tp_dst == geneve->info.key.tp_dst &&
1175 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1181 static bool is_all_zero(const u8 *fp, size_t size)
1185 for (i = 0; i < size; i++)
1191 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1193 if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1194 info->key.ttl || info->key.label || info->key.tp_src ||
1195 !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1201 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1202 struct ip_tunnel_info *b)
1204 if (ip_tunnel_info_af(a) == AF_INET)
1205 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1207 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1210 static int geneve_configure(struct net *net, struct net_device *dev,
1211 struct netlink_ext_ack *extack,
1212 const struct ip_tunnel_info *info,
1213 bool metadata, bool ipv6_rx_csum)
1215 struct geneve_net *gn = net_generic(net, geneve_net_id);
1216 struct geneve_dev *t, *geneve = netdev_priv(dev);
1217 bool tun_collect_md, tun_on_same_port;
1220 if (metadata && !is_tnl_info_zero(info)) {
1221 NL_SET_ERR_MSG(extack,
1222 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1229 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1233 /* make enough headroom for basic scenario */
1234 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1235 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1236 encap_len += sizeof(struct iphdr);
1237 dev->max_mtu -= sizeof(struct iphdr);
1239 encap_len += sizeof(struct ipv6hdr);
1240 dev->max_mtu -= sizeof(struct ipv6hdr);
1242 dev->needed_headroom = encap_len + ETH_HLEN;
1245 if (tun_on_same_port) {
1246 NL_SET_ERR_MSG(extack,
1247 "There can be only one externally controlled device on a destination port");
1251 if (tun_collect_md) {
1252 NL_SET_ERR_MSG(extack,
1253 "There already exists an externally controlled device on this destination port");
1258 dst_cache_reset(&geneve->info.dst_cache);
1259 geneve->info = *info;
1260 geneve->collect_md = metadata;
1261 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1263 err = register_netdevice(dev);
1267 list_add(&geneve->next, &gn->geneve_list);
1271 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1273 memset(info, 0, sizeof(*info));
1274 info->key.tp_dst = htons(dst_port);
1277 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1278 struct netlink_ext_ack *extack,
1279 struct ip_tunnel_info *info, bool *metadata,
1280 bool *use_udp6_rx_checksums, bool changelink)
1284 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1285 NL_SET_ERR_MSG(extack,
1286 "Cannot specify both IPv4 and IPv6 Remote addresses");
1290 if (data[IFLA_GENEVE_REMOTE]) {
1291 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1292 attrtype = IFLA_GENEVE_REMOTE;
1296 info->key.u.ipv4.dst =
1297 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1299 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1300 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1301 "Remote IPv4 address cannot be Multicast");
1306 if (data[IFLA_GENEVE_REMOTE6]) {
1307 #if IS_ENABLED(CONFIG_IPV6)
1308 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1309 attrtype = IFLA_GENEVE_REMOTE6;
1313 info->mode = IP_TUNNEL_INFO_IPV6;
1314 info->key.u.ipv6.dst =
1315 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1317 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1318 IPV6_ADDR_LINKLOCAL) {
1319 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1320 "Remote IPv6 address cannot be link-local");
1323 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1324 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1325 "Remote IPv6 address cannot be Multicast");
1328 info->key.tun_flags |= TUNNEL_CSUM;
1329 *use_udp6_rx_checksums = true;
1331 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1332 "IPv6 support not enabled in the kernel");
1333 return -EPFNOSUPPORT;
1337 if (data[IFLA_GENEVE_ID]) {
1342 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1343 tvni[0] = (vni & 0x00ff0000) >> 16;
1344 tvni[1] = (vni & 0x0000ff00) >> 8;
1345 tvni[2] = vni & 0x000000ff;
1347 tunid = vni_to_tunnel_id(tvni);
1348 if (changelink && (tunid != info->key.tun_id)) {
1349 attrtype = IFLA_GENEVE_ID;
1352 info->key.tun_id = tunid;
1355 if (data[IFLA_GENEVE_TTL])
1356 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1358 if (data[IFLA_GENEVE_TOS])
1359 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1361 if (data[IFLA_GENEVE_LABEL]) {
1362 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1363 IPV6_FLOWLABEL_MASK;
1364 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1365 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1366 "Label attribute only applies for IPv6 Geneve devices");
1371 if (data[IFLA_GENEVE_PORT]) {
1373 attrtype = IFLA_GENEVE_PORT;
1376 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1379 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1381 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1387 if (data[IFLA_GENEVE_UDP_CSUM]) {
1389 attrtype = IFLA_GENEVE_UDP_CSUM;
1392 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1393 info->key.tun_flags |= TUNNEL_CSUM;
1396 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1397 #if IS_ENABLED(CONFIG_IPV6)
1399 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1402 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1403 info->key.tun_flags &= ~TUNNEL_CSUM;
1405 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1406 "IPv6 support not enabled in the kernel");
1407 return -EPFNOSUPPORT;
1411 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1412 #if IS_ENABLED(CONFIG_IPV6)
1414 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1417 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1418 *use_udp6_rx_checksums = false;
1420 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1421 "IPv6 support not enabled in the kernel");
1422 return -EPFNOSUPPORT;
1428 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1429 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1433 static int geneve_newlink(struct net *net, struct net_device *dev,
1434 struct nlattr *tb[], struct nlattr *data[],
1435 struct netlink_ext_ack *extack)
1437 bool use_udp6_rx_checksums = false;
1438 struct ip_tunnel_info info;
1439 bool metadata = false;
1442 init_tnl_info(&info, GENEVE_UDP_PORT);
1443 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1444 &use_udp6_rx_checksums, false);
1448 return geneve_configure(net, dev, extack, &info, metadata,
1449 use_udp6_rx_checksums);
1452 /* Quiesces the geneve device data path for both TX and RX.
1454 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1455 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1456 * to complete for the existing set of in-flight packets to be transmitted,
1457 * then we would have quiesced the transmit data path. All the future packets
1458 * will get dropped until we unquiesce the data path.
1460 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1461 * if we set that to NULL under RCU and wait for synchronize_net() to
1462 * complete, then we would have quiesced the receive data path.
1464 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1465 struct geneve_sock **gs6)
1467 *gs4 = rtnl_dereference(geneve->sock4);
1468 rcu_assign_pointer(geneve->sock4, NULL);
1470 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1471 #if IS_ENABLED(CONFIG_IPV6)
1472 *gs6 = rtnl_dereference(geneve->sock6);
1473 rcu_assign_pointer(geneve->sock6, NULL);
1475 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1482 /* Resumes the geneve device data path for both TX and RX. */
1483 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1484 struct geneve_sock __maybe_unused *gs6)
1486 rcu_assign_pointer(geneve->sock4, gs4);
1488 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1489 #if IS_ENABLED(CONFIG_IPV6)
1490 rcu_assign_pointer(geneve->sock6, gs6);
1492 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1497 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1498 struct nlattr *data[],
1499 struct netlink_ext_ack *extack)
1501 struct geneve_dev *geneve = netdev_priv(dev);
1502 struct geneve_sock *gs4, *gs6;
1503 struct ip_tunnel_info info;
1505 bool use_udp6_rx_checksums;
1508 /* If the geneve device is configured for metadata (or externally
1509 * controlled, for example, OVS), then nothing can be changed.
1511 if (geneve->collect_md)
1514 /* Start with the existing info. */
1515 memcpy(&info, &geneve->info, sizeof(info));
1516 metadata = geneve->collect_md;
1517 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1518 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1519 &use_udp6_rx_checksums, true);
1523 if (!geneve_dst_addr_equal(&geneve->info, &info))
1524 dst_cache_reset(&info.dst_cache);
1526 geneve_quiesce(geneve, &gs4, &gs6);
1527 geneve->info = info;
1528 geneve->collect_md = metadata;
1529 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1530 geneve_unquiesce(geneve, gs4, gs6);
1535 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1537 struct geneve_dev *geneve = netdev_priv(dev);
1539 list_del(&geneve->next);
1540 unregister_netdevice_queue(dev, head);
1543 static size_t geneve_get_size(const struct net_device *dev)
1545 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1546 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1547 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1548 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1549 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1550 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1551 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1552 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1553 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1554 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1558 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1560 struct geneve_dev *geneve = netdev_priv(dev);
1561 struct ip_tunnel_info *info = &geneve->info;
1562 bool metadata = geneve->collect_md;
1566 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1567 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1568 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1569 goto nla_put_failure;
1571 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1572 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1573 info->key.u.ipv4.dst))
1574 goto nla_put_failure;
1575 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1576 !!(info->key.tun_flags & TUNNEL_CSUM)))
1577 goto nla_put_failure;
1579 #if IS_ENABLED(CONFIG_IPV6)
1580 } else if (!metadata) {
1581 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1582 &info->key.u.ipv6.dst))
1583 goto nla_put_failure;
1584 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1585 !(info->key.tun_flags & TUNNEL_CSUM)))
1586 goto nla_put_failure;
1590 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1591 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1592 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1593 goto nla_put_failure;
1595 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1596 goto nla_put_failure;
1598 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1599 goto nla_put_failure;
1601 #if IS_ENABLED(CONFIG_IPV6)
1602 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1603 !geneve->use_udp6_rx_checksums))
1604 goto nla_put_failure;
1613 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1615 .maxtype = IFLA_GENEVE_MAX,
1616 .policy = geneve_policy,
1617 .priv_size = sizeof(struct geneve_dev),
1618 .setup = geneve_setup,
1619 .validate = geneve_validate,
1620 .newlink = geneve_newlink,
1621 .changelink = geneve_changelink,
1622 .dellink = geneve_dellink,
1623 .get_size = geneve_get_size,
1624 .fill_info = geneve_fill_info,
1627 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1628 u8 name_assign_type, u16 dst_port)
1630 struct nlattr *tb[IFLA_MAX + 1];
1631 struct ip_tunnel_info info;
1632 struct net_device *dev;
1633 LIST_HEAD(list_kill);
1636 memset(tb, 0, sizeof(tb));
1637 dev = rtnl_create_link(net, name, name_assign_type,
1638 &geneve_link_ops, tb);
1642 init_tnl_info(&info, dst_port);
1643 err = geneve_configure(net, dev, NULL, &info, true, true);
1646 return ERR_PTR(err);
1649 /* openvswitch users expect packet sizes to be unrestricted,
1650 * so set the largest MTU we can.
1652 err = geneve_change_mtu(dev, IP_MAX_MTU);
1656 err = rtnl_configure_link(dev, NULL);
1662 geneve_dellink(dev, &list_kill);
1663 unregister_netdevice_many(&list_kill);
1664 return ERR_PTR(err);
1666 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1668 static int geneve_netdevice_event(struct notifier_block *unused,
1669 unsigned long event, void *ptr)
1671 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1673 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1674 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1675 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1676 } else if (event == NETDEV_UNREGISTER) {
1677 geneve_offload_rx_ports(dev, false);
1678 } else if (event == NETDEV_REGISTER) {
1679 geneve_offload_rx_ports(dev, true);
1685 static struct notifier_block geneve_notifier_block __read_mostly = {
1686 .notifier_call = geneve_netdevice_event,
1689 static __net_init int geneve_init_net(struct net *net)
1691 struct geneve_net *gn = net_generic(net, geneve_net_id);
1693 INIT_LIST_HEAD(&gn->geneve_list);
1694 INIT_LIST_HEAD(&gn->sock_list);
1698 static void __net_exit geneve_exit_net(struct net *net)
1700 struct geneve_net *gn = net_generic(net, geneve_net_id);
1701 struct geneve_dev *geneve, *next;
1702 struct net_device *dev, *aux;
1707 /* gather any geneve devices that were moved into this ns */
1708 for_each_netdev_safe(net, dev, aux)
1709 if (dev->rtnl_link_ops == &geneve_link_ops)
1710 unregister_netdevice_queue(dev, &list);
1712 /* now gather any other geneve devices that were created in this ns */
1713 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1714 /* If geneve->dev is in the same netns, it was already added
1715 * to the list by the previous loop.
1717 if (!net_eq(dev_net(geneve->dev), net))
1718 unregister_netdevice_queue(geneve->dev, &list);
1721 /* unregister the devices gathered above */
1722 unregister_netdevice_many(&list);
1726 static struct pernet_operations geneve_net_ops = {
1727 .init = geneve_init_net,
1728 .exit = geneve_exit_net,
1729 .id = &geneve_net_id,
1730 .size = sizeof(struct geneve_net),
1733 static int __init geneve_init_module(void)
1737 rc = register_pernet_subsys(&geneve_net_ops);
1741 rc = register_netdevice_notifier(&geneve_notifier_block);
1745 rc = rtnl_link_register(&geneve_link_ops);
1751 unregister_netdevice_notifier(&geneve_notifier_block);
1753 unregister_pernet_subsys(&geneve_net_ops);
1757 late_initcall(geneve_init_module);
1759 static void __exit geneve_cleanup_module(void)
1761 rtnl_link_unregister(&geneve_link_ops);
1762 unregister_netdevice_notifier(&geneve_notifier_block);
1763 unregister_pernet_subsys(&geneve_net_ops);
1765 module_exit(geneve_cleanup_module);
1767 MODULE_LICENSE("GPL");
1768 MODULE_VERSION(GENEVE_NETDEV_VER);
1769 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1770 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1771 MODULE_ALIAS_RTNL_LINK("geneve");