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))
39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
42 /* per-network namespace private data for this module */
44 struct list_head geneve_list;
45 struct list_head sock_list;
48 static unsigned int geneve_net_id;
50 struct geneve_dev_node {
51 struct hlist_node hlist;
52 struct geneve_dev *geneve;
55 /* Pseudo network device */
57 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
58 #if IS_ENABLED(CONFIG_IPV6)
59 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
61 struct net *net; /* netns for packet i/o */
62 struct net_device *dev; /* netdev for geneve tunnel */
63 struct ip_tunnel_info info;
64 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
65 #if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
68 struct list_head next; /* geneve's per namespace list */
69 struct gro_cells gro_cells;
71 bool use_udp6_rx_checksums;
76 struct list_head list;
80 struct hlist_head vni_list[VNI_HASH_SIZE];
83 static inline __u32 geneve_net_vni_hash(u8 vni[3])
87 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
88 return hash_32(vnid, VNI_HASH_BITS);
91 static __be64 vni_to_tunnel_id(const __u8 *vni)
94 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
96 return (__force __be64)(((__force u64)vni[0] << 40) |
97 ((__force u64)vni[1] << 48) |
98 ((__force u64)vni[2] << 56));
102 /* Convert 64 bit tunnel ID to 24 bit VNI. */
103 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
106 vni[0] = (__force __u8)(tun_id >> 16);
107 vni[1] = (__force __u8)(tun_id >> 8);
108 vni[2] = (__force __u8)tun_id;
110 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
111 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
112 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
116 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
118 return !memcmp(vni, &tun_id[5], 3);
121 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
123 return gs->sock->sk->sk_family;
126 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
127 __be32 addr, u8 vni[])
129 struct hlist_head *vni_list_head;
130 struct geneve_dev_node *node;
133 /* Find the device for this VNI */
134 hash = geneve_net_vni_hash(vni);
135 vni_list_head = &gs->vni_list[hash];
136 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
137 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
138 addr == node->geneve->info.key.u.ipv4.dst)
144 #if IS_ENABLED(CONFIG_IPV6)
145 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
146 struct in6_addr addr6, u8 vni[])
148 struct hlist_head *vni_list_head;
149 struct geneve_dev_node *node;
152 /* Find the device for this VNI */
153 hash = geneve_net_vni_hash(vni);
154 vni_list_head = &gs->vni_list[hash];
155 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
156 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
157 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
164 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
166 return (struct genevehdr *)(udp_hdr(skb) + 1);
169 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
172 static u8 zero_vni[3];
175 if (geneve_get_sk_family(gs) == AF_INET) {
179 iph = ip_hdr(skb); /* outer IP header... */
181 if (gs->collect_md) {
185 vni = geneve_hdr(skb)->vni;
189 return geneve_lookup(gs, addr, vni);
190 #if IS_ENABLED(CONFIG_IPV6)
191 } else if (geneve_get_sk_family(gs) == AF_INET6) {
192 static struct in6_addr zero_addr6;
193 struct ipv6hdr *ip6h;
194 struct in6_addr addr6;
196 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
198 if (gs->collect_md) {
202 vni = geneve_hdr(skb)->vni;
206 return geneve6_lookup(gs, addr6, vni);
212 /* geneve receive/decap routine */
213 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
216 struct genevehdr *gnvh = geneve_hdr(skb);
217 struct metadata_dst *tun_dst = NULL;
218 struct pcpu_sw_netstats *stats;
223 if (ip_tunnel_collect_metadata() || gs->collect_md) {
226 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
227 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
229 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
230 vni_to_tunnel_id(gnvh->vni),
233 geneve->dev->stats.rx_dropped++;
236 /* Update tunnel dst according to Geneve options. */
237 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
238 gnvh->options, gnvh->opt_len * 4,
241 /* Drop packets w/ critical options,
242 * since we don't support any...
244 if (gnvh->critical) {
245 geneve->dev->stats.rx_frame_errors++;
246 geneve->dev->stats.rx_errors++;
251 skb_reset_mac_header(skb);
252 skb->protocol = eth_type_trans(skb, geneve->dev);
253 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
256 skb_dst_set(skb, &tun_dst->dst);
258 /* Ignore packet loops (and multicast echo) */
259 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
260 geneve->dev->stats.rx_errors++;
264 oiph = skb_network_header(skb);
265 skb_reset_network_header(skb);
267 if (geneve_get_sk_family(gs) == AF_INET)
268 err = IP_ECN_decapsulate(oiph, skb);
269 #if IS_ENABLED(CONFIG_IPV6)
271 err = IP6_ECN_decapsulate(oiph, skb);
276 if (geneve_get_sk_family(gs) == AF_INET)
277 net_info_ratelimited("non-ECT from %pI4 "
279 &((struct iphdr *)oiph)->saddr,
280 ((struct iphdr *)oiph)->tos);
281 #if IS_ENABLED(CONFIG_IPV6)
283 net_info_ratelimited("non-ECT from %pI6\n",
284 &((struct ipv6hdr *)oiph)->saddr);
288 ++geneve->dev->stats.rx_frame_errors;
289 ++geneve->dev->stats.rx_errors;
295 err = gro_cells_receive(&geneve->gro_cells, skb);
296 if (likely(err == NET_RX_SUCCESS)) {
297 stats = this_cpu_ptr(geneve->dev->tstats);
298 u64_stats_update_begin(&stats->syncp);
300 stats->rx_bytes += len;
301 u64_stats_update_end(&stats->syncp);
305 /* Consume bad packet */
309 /* Setup stats when device is created */
310 static int geneve_init(struct net_device *dev)
312 struct geneve_dev *geneve = netdev_priv(dev);
315 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
319 err = gro_cells_init(&geneve->gro_cells, dev);
321 free_percpu(dev->tstats);
325 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
327 free_percpu(dev->tstats);
328 gro_cells_destroy(&geneve->gro_cells);
334 static void geneve_uninit(struct net_device *dev)
336 struct geneve_dev *geneve = netdev_priv(dev);
338 dst_cache_destroy(&geneve->info.dst_cache);
339 gro_cells_destroy(&geneve->gro_cells);
340 free_percpu(dev->tstats);
343 /* Callback from net/ipv4/udp.c to receive packets */
344 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
346 struct genevehdr *geneveh;
347 struct geneve_dev *geneve;
348 struct geneve_sock *gs;
351 /* Need UDP and Geneve header to be present */
352 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
355 /* Return packets with reserved bits set */
356 geneveh = geneve_hdr(skb);
357 if (unlikely(geneveh->ver != GENEVE_VER))
360 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
363 gs = rcu_dereference_sk_user_data(sk);
367 geneve = geneve_lookup_skb(gs, skb);
371 opts_len = geneveh->opt_len * 4;
372 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
374 !net_eq(geneve->net, dev_net(geneve->dev)))) {
375 geneve->dev->stats.rx_dropped++;
379 geneve_rx(geneve, gs, skb);
383 /* Consume bad packet */
388 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
389 __be16 port, bool ipv6_rx_csum)
392 struct udp_port_cfg udp_conf;
395 memset(&udp_conf, 0, sizeof(udp_conf));
398 udp_conf.family = AF_INET6;
399 udp_conf.ipv6_v6only = 1;
400 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
402 udp_conf.family = AF_INET;
403 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
406 udp_conf.local_udp_port = port;
408 /* Open UDP socket */
409 err = udp_sock_create(net, &udp_conf, &sock);
416 static int geneve_hlen(struct genevehdr *gh)
418 return sizeof(*gh) + gh->opt_len * 4;
421 static struct sk_buff *geneve_gro_receive(struct sock *sk,
422 struct list_head *head,
425 struct sk_buff *pp = NULL;
427 struct genevehdr *gh, *gh2;
428 unsigned int hlen, gh_len, off_gnv;
429 const struct packet_offload *ptype;
433 off_gnv = skb_gro_offset(skb);
434 hlen = off_gnv + sizeof(*gh);
435 gh = skb_gro_header_fast(skb, off_gnv);
436 if (skb_gro_header_hard(skb, hlen)) {
437 gh = skb_gro_header_slow(skb, hlen, off_gnv);
442 if (gh->ver != GENEVE_VER || gh->oam)
444 gh_len = geneve_hlen(gh);
446 hlen = off_gnv + gh_len;
447 if (skb_gro_header_hard(skb, hlen)) {
448 gh = skb_gro_header_slow(skb, hlen, off_gnv);
453 list_for_each_entry(p, head, list) {
454 if (!NAPI_GRO_CB(p)->same_flow)
457 gh2 = (struct genevehdr *)(p->data + off_gnv);
458 if (gh->opt_len != gh2->opt_len ||
459 memcmp(gh, gh2, gh_len)) {
460 NAPI_GRO_CB(p)->same_flow = 0;
465 type = gh->proto_type;
468 ptype = gro_find_receive_by_type(type);
472 skb_gro_pull(skb, gh_len);
473 skb_gro_postpull_rcsum(skb, gh, gh_len);
474 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
480 skb_gro_flush_final(skb, pp, flush);
485 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
488 struct genevehdr *gh;
489 struct packet_offload *ptype;
494 gh = (struct genevehdr *)(skb->data + nhoff);
495 gh_len = geneve_hlen(gh);
496 type = gh->proto_type;
499 ptype = gro_find_complete_by_type(type);
501 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
505 skb_set_inner_mac_header(skb, nhoff + gh_len);
510 /* Create new listen socket if needed */
511 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
512 bool ipv6, bool ipv6_rx_csum)
514 struct geneve_net *gn = net_generic(net, geneve_net_id);
515 struct geneve_sock *gs;
517 struct udp_tunnel_sock_cfg tunnel_cfg;
520 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
522 return ERR_PTR(-ENOMEM);
524 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
527 return ERR_CAST(sock);
532 for (h = 0; h < VNI_HASH_SIZE; ++h)
533 INIT_HLIST_HEAD(&gs->vni_list[h]);
535 /* Initialize the geneve udp offloads structure */
536 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
538 /* Mark socket as an encapsulation socket */
539 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
540 tunnel_cfg.sk_user_data = gs;
541 tunnel_cfg.encap_type = 1;
542 tunnel_cfg.gro_receive = geneve_gro_receive;
543 tunnel_cfg.gro_complete = geneve_gro_complete;
544 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
545 tunnel_cfg.encap_destroy = NULL;
546 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
547 list_add(&gs->list, &gn->sock_list);
551 static void __geneve_sock_release(struct geneve_sock *gs)
553 if (!gs || --gs->refcnt)
557 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
558 udp_tunnel_sock_release(gs->sock);
562 static void geneve_sock_release(struct geneve_dev *geneve)
564 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
565 #if IS_ENABLED(CONFIG_IPV6)
566 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
568 rcu_assign_pointer(geneve->sock6, NULL);
571 rcu_assign_pointer(geneve->sock4, NULL);
574 __geneve_sock_release(gs4);
575 #if IS_ENABLED(CONFIG_IPV6)
576 __geneve_sock_release(gs6);
580 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
584 struct geneve_sock *gs;
586 list_for_each_entry(gs, &gn->sock_list, list) {
587 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
588 geneve_get_sk_family(gs) == family) {
595 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
597 struct net *net = geneve->net;
598 struct geneve_net *gn = net_generic(net, geneve_net_id);
599 struct geneve_dev_node *node;
600 struct geneve_sock *gs;
604 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
610 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
611 geneve->use_udp6_rx_checksums);
616 gs->collect_md = geneve->collect_md;
617 #if IS_ENABLED(CONFIG_IPV6)
619 rcu_assign_pointer(geneve->sock6, gs);
620 node = &geneve->hlist6;
624 rcu_assign_pointer(geneve->sock4, gs);
625 node = &geneve->hlist4;
627 node->geneve = geneve;
629 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
630 hash = geneve_net_vni_hash(vni);
631 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
635 static int geneve_open(struct net_device *dev)
637 struct geneve_dev *geneve = netdev_priv(dev);
638 bool metadata = geneve->collect_md;
642 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
643 ipv4 = !ipv6 || metadata;
644 #if IS_ENABLED(CONFIG_IPV6)
646 ret = geneve_sock_add(geneve, true);
647 if (ret < 0 && ret != -EAFNOSUPPORT)
652 ret = geneve_sock_add(geneve, false);
654 geneve_sock_release(geneve);
659 static int geneve_stop(struct net_device *dev)
661 struct geneve_dev *geneve = netdev_priv(dev);
663 hlist_del_init_rcu(&geneve->hlist4.hlist);
664 #if IS_ENABLED(CONFIG_IPV6)
665 hlist_del_init_rcu(&geneve->hlist6.hlist);
667 geneve_sock_release(geneve);
671 static void geneve_build_header(struct genevehdr *geneveh,
672 const struct ip_tunnel_info *info)
674 geneveh->ver = GENEVE_VER;
675 geneveh->opt_len = info->options_len / 4;
676 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
677 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
679 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
680 geneveh->proto_type = htons(ETH_P_TEB);
683 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
684 ip_tunnel_info_opts_get(geneveh->options, info);
687 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
688 const struct ip_tunnel_info *info,
689 bool xnet, int ip_hdr_len)
691 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
692 struct genevehdr *gnvh;
696 skb_reset_mac_header(skb);
697 skb_scrub_packet(skb, xnet);
699 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
700 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
701 err = skb_cow_head(skb, min_headroom);
705 err = udp_tunnel_handle_offloads(skb, udp_sum);
709 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
710 geneve_build_header(gnvh, info);
711 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
719 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
720 struct net_device *dev,
721 struct geneve_sock *gs4,
723 const struct ip_tunnel_info *info,
724 __be16 dport, __be16 sport)
726 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
727 struct geneve_dev *geneve = netdev_priv(dev);
728 struct dst_cache *dst_cache;
729 struct rtable *rt = NULL;
733 return ERR_PTR(-EIO);
735 memset(fl4, 0, sizeof(*fl4));
736 fl4->flowi4_mark = skb->mark;
737 fl4->flowi4_proto = IPPROTO_UDP;
738 fl4->daddr = info->key.u.ipv4.dst;
739 fl4->saddr = info->key.u.ipv4.src;
740 fl4->fl4_dport = dport;
741 fl4->fl4_sport = sport;
744 if ((tos == 1) && !geneve->collect_md) {
745 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
748 fl4->flowi4_tos = RT_TOS(tos);
750 dst_cache = (struct dst_cache *)&info->dst_cache;
752 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
756 rt = ip_route_output_key(geneve->net, fl4);
758 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
759 return ERR_PTR(-ENETUNREACH);
761 if (rt->dst.dev == dev) { /* is this necessary? */
762 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
764 return ERR_PTR(-ELOOP);
767 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
771 #if IS_ENABLED(CONFIG_IPV6)
772 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
773 struct net_device *dev,
774 struct geneve_sock *gs6,
776 const struct ip_tunnel_info *info,
777 __be16 dport, __be16 sport)
779 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
780 struct geneve_dev *geneve = netdev_priv(dev);
781 struct dst_entry *dst = NULL;
782 struct dst_cache *dst_cache;
786 return ERR_PTR(-EIO);
788 memset(fl6, 0, sizeof(*fl6));
789 fl6->flowi6_mark = skb->mark;
790 fl6->flowi6_proto = IPPROTO_UDP;
791 fl6->daddr = info->key.u.ipv6.dst;
792 fl6->saddr = info->key.u.ipv6.src;
793 fl6->fl6_dport = dport;
794 fl6->fl6_sport = sport;
796 prio = info->key.tos;
797 if ((prio == 1) && !geneve->collect_md) {
798 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
802 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
804 dst_cache = (struct dst_cache *)&info->dst_cache;
806 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
810 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
813 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
814 return ERR_PTR(-ENETUNREACH);
816 if (dst->dev == dev) { /* is this necessary? */
817 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
819 return ERR_PTR(-ELOOP);
823 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
828 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
829 struct geneve_dev *geneve,
830 const struct ip_tunnel_info *info)
832 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
833 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
834 const struct ip_tunnel_key *key = &info->key;
842 if (!pskb_inet_may_pull(skb))
845 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
846 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
847 geneve->info.key.tp_dst, sport);
851 skb_tunnel_check_pmtu(skb, &rt->dst,
852 GENEVE_IPV4_HLEN + info->options_len);
854 if (geneve->collect_md) {
855 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
858 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
859 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
861 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
863 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
867 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
868 tos, ttl, df, sport, geneve->info.key.tp_dst,
869 !net_eq(geneve->net, dev_net(geneve->dev)),
870 !(info->key.tun_flags & TUNNEL_CSUM));
874 #if IS_ENABLED(CONFIG_IPV6)
875 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
876 struct geneve_dev *geneve,
877 const struct ip_tunnel_info *info)
879 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
880 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
881 const struct ip_tunnel_key *key = &info->key;
882 struct dst_entry *dst = NULL;
888 if (!pskb_inet_may_pull(skb))
891 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
892 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
893 geneve->info.key.tp_dst, sport);
897 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
899 if (geneve->collect_md) {
900 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
903 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
905 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
907 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
911 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
912 &fl6.saddr, &fl6.daddr, prio, ttl,
913 info->key.label, sport, geneve->info.key.tp_dst,
914 !(info->key.tun_flags & TUNNEL_CSUM));
919 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
921 struct geneve_dev *geneve = netdev_priv(dev);
922 struct ip_tunnel_info *info = NULL;
925 if (geneve->collect_md) {
926 info = skb_tunnel_info(skb);
927 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
928 netdev_dbg(dev, "no tunnel metadata\n");
930 dev->stats.tx_dropped++;
934 info = &geneve->info;
938 #if IS_ENABLED(CONFIG_IPV6)
939 if (info->mode & IP_TUNNEL_INFO_IPV6)
940 err = geneve6_xmit_skb(skb, dev, geneve, info);
943 err = geneve_xmit_skb(skb, dev, geneve, info);
952 dev->stats.collisions++;
953 else if (err == -ENETUNREACH)
954 dev->stats.tx_carrier_errors++;
956 dev->stats.tx_errors++;
960 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
962 if (new_mtu > dev->max_mtu)
963 new_mtu = dev->max_mtu;
964 else if (new_mtu < dev->min_mtu)
965 new_mtu = dev->min_mtu;
971 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
973 struct ip_tunnel_info *info = skb_tunnel_info(skb);
974 struct geneve_dev *geneve = netdev_priv(dev);
977 if (ip_tunnel_info_af(info) == AF_INET) {
981 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
982 sport = udp_flow_src_port(geneve->net, skb,
985 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
986 geneve->info.key.tp_dst, sport);
991 info->key.u.ipv4.src = fl4.saddr;
992 #if IS_ENABLED(CONFIG_IPV6)
993 } else if (ip_tunnel_info_af(info) == AF_INET6) {
994 struct dst_entry *dst;
997 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
998 sport = udp_flow_src_port(geneve->net, skb,
1001 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1002 geneve->info.key.tp_dst, sport);
1004 return PTR_ERR(dst);
1007 info->key.u.ipv6.src = fl6.saddr;
1013 info->key.tp_src = sport;
1014 info->key.tp_dst = geneve->info.key.tp_dst;
1018 static const struct net_device_ops geneve_netdev_ops = {
1019 .ndo_init = geneve_init,
1020 .ndo_uninit = geneve_uninit,
1021 .ndo_open = geneve_open,
1022 .ndo_stop = geneve_stop,
1023 .ndo_start_xmit = geneve_xmit,
1024 .ndo_get_stats64 = ip_tunnel_get_stats64,
1025 .ndo_change_mtu = geneve_change_mtu,
1026 .ndo_validate_addr = eth_validate_addr,
1027 .ndo_set_mac_address = eth_mac_addr,
1028 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1031 static void geneve_get_drvinfo(struct net_device *dev,
1032 struct ethtool_drvinfo *drvinfo)
1034 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1035 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1038 static const struct ethtool_ops geneve_ethtool_ops = {
1039 .get_drvinfo = geneve_get_drvinfo,
1040 .get_link = ethtool_op_get_link,
1043 /* Info for udev, that this is a virtual tunnel endpoint */
1044 static struct device_type geneve_type = {
1048 /* Calls the ndo_udp_tunnel_add of the caller in order to
1049 * supply the listening GENEVE udp ports. Callers are expected
1050 * to implement the ndo_udp_tunnel_add.
1052 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1054 struct net *net = dev_net(dev);
1055 struct geneve_net *gn = net_generic(net, geneve_net_id);
1056 struct geneve_sock *gs;
1059 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1061 udp_tunnel_push_rx_port(dev, gs->sock,
1062 UDP_TUNNEL_TYPE_GENEVE);
1064 udp_tunnel_drop_rx_port(dev, gs->sock,
1065 UDP_TUNNEL_TYPE_GENEVE);
1071 /* Initialize the device structure. */
1072 static void geneve_setup(struct net_device *dev)
1076 dev->netdev_ops = &geneve_netdev_ops;
1077 dev->ethtool_ops = &geneve_ethtool_ops;
1078 dev->needs_free_netdev = true;
1080 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1082 dev->features |= NETIF_F_LLTX;
1083 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1084 dev->features |= NETIF_F_RXCSUM;
1085 dev->features |= NETIF_F_GSO_SOFTWARE;
1087 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1088 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1090 /* MTU range: 68 - (something less than 65535) */
1091 dev->min_mtu = ETH_MIN_MTU;
1092 /* The max_mtu calculation does not take account of GENEVE
1093 * options, to avoid excluding potentially valid
1094 * configurations. This will be further reduced by IPvX hdr size.
1096 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1098 netif_keep_dst(dev);
1099 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1100 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1101 eth_hw_addr_random(dev);
1104 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1105 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1106 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1107 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1108 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1109 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1110 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1111 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1112 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1113 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1114 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1115 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1118 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1119 struct netlink_ext_ack *extack)
1121 if (tb[IFLA_ADDRESS]) {
1122 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1123 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1124 "Provided link layer address is not Ethernet");
1128 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1129 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1130 "Provided Ethernet address is not unicast");
1131 return -EADDRNOTAVAIL;
1136 NL_SET_ERR_MSG(extack,
1137 "Not enough attributes provided to perform the operation");
1141 if (data[IFLA_GENEVE_ID]) {
1142 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1144 if (vni >= GENEVE_N_VID) {
1145 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1146 "Geneve ID must be lower than 16777216");
1154 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1155 const struct ip_tunnel_info *info,
1156 bool *tun_on_same_port,
1157 bool *tun_collect_md)
1159 struct geneve_dev *geneve, *t = NULL;
1161 *tun_on_same_port = false;
1162 *tun_collect_md = false;
1163 list_for_each_entry(geneve, &gn->geneve_list, next) {
1164 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1165 *tun_collect_md = geneve->collect_md;
1166 *tun_on_same_port = true;
1168 if (info->key.tun_id == geneve->info.key.tun_id &&
1169 info->key.tp_dst == geneve->info.key.tp_dst &&
1170 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1176 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1178 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1179 info->key.ttl || info->key.label || info->key.tp_src ||
1180 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1183 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1184 struct ip_tunnel_info *b)
1186 if (ip_tunnel_info_af(a) == AF_INET)
1187 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1189 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1192 static int geneve_configure(struct net *net, struct net_device *dev,
1193 struct netlink_ext_ack *extack,
1194 const struct ip_tunnel_info *info,
1195 bool metadata, bool ipv6_rx_csum)
1197 struct geneve_net *gn = net_generic(net, geneve_net_id);
1198 struct geneve_dev *t, *geneve = netdev_priv(dev);
1199 bool tun_collect_md, tun_on_same_port;
1202 if (metadata && !is_tnl_info_zero(info)) {
1203 NL_SET_ERR_MSG(extack,
1204 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1211 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1215 /* make enough headroom for basic scenario */
1216 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1217 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1218 encap_len += sizeof(struct iphdr);
1219 dev->max_mtu -= sizeof(struct iphdr);
1221 encap_len += sizeof(struct ipv6hdr);
1222 dev->max_mtu -= sizeof(struct ipv6hdr);
1224 dev->needed_headroom = encap_len + ETH_HLEN;
1227 if (tun_on_same_port) {
1228 NL_SET_ERR_MSG(extack,
1229 "There can be only one externally controlled device on a destination port");
1233 if (tun_collect_md) {
1234 NL_SET_ERR_MSG(extack,
1235 "There already exists an externally controlled device on this destination port");
1240 dst_cache_reset(&geneve->info.dst_cache);
1241 geneve->info = *info;
1242 geneve->collect_md = metadata;
1243 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1245 err = register_netdevice(dev);
1249 list_add(&geneve->next, &gn->geneve_list);
1253 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1255 memset(info, 0, sizeof(*info));
1256 info->key.tp_dst = htons(dst_port);
1259 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1260 struct netlink_ext_ack *extack,
1261 struct ip_tunnel_info *info, bool *metadata,
1262 bool *use_udp6_rx_checksums, bool changelink)
1266 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1267 NL_SET_ERR_MSG(extack,
1268 "Cannot specify both IPv4 and IPv6 Remote addresses");
1272 if (data[IFLA_GENEVE_REMOTE]) {
1273 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1274 attrtype = IFLA_GENEVE_REMOTE;
1278 info->key.u.ipv4.dst =
1279 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1281 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1282 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1283 "Remote IPv4 address cannot be Multicast");
1288 if (data[IFLA_GENEVE_REMOTE6]) {
1289 #if IS_ENABLED(CONFIG_IPV6)
1290 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1291 attrtype = IFLA_GENEVE_REMOTE6;
1295 info->mode = IP_TUNNEL_INFO_IPV6;
1296 info->key.u.ipv6.dst =
1297 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1299 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1300 IPV6_ADDR_LINKLOCAL) {
1301 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1302 "Remote IPv6 address cannot be link-local");
1305 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1306 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1307 "Remote IPv6 address cannot be Multicast");
1310 info->key.tun_flags |= TUNNEL_CSUM;
1311 *use_udp6_rx_checksums = true;
1313 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1314 "IPv6 support not enabled in the kernel");
1315 return -EPFNOSUPPORT;
1319 if (data[IFLA_GENEVE_ID]) {
1324 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1325 tvni[0] = (vni & 0x00ff0000) >> 16;
1326 tvni[1] = (vni & 0x0000ff00) >> 8;
1327 tvni[2] = vni & 0x000000ff;
1329 tunid = vni_to_tunnel_id(tvni);
1330 if (changelink && (tunid != info->key.tun_id)) {
1331 attrtype = IFLA_GENEVE_ID;
1334 info->key.tun_id = tunid;
1337 if (data[IFLA_GENEVE_TTL])
1338 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1340 if (data[IFLA_GENEVE_TOS])
1341 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1343 if (data[IFLA_GENEVE_LABEL]) {
1344 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1345 IPV6_FLOWLABEL_MASK;
1346 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1347 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1348 "Label attribute only applies for IPv6 Geneve devices");
1353 if (data[IFLA_GENEVE_PORT]) {
1355 attrtype = IFLA_GENEVE_PORT;
1358 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1361 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1363 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1369 if (data[IFLA_GENEVE_UDP_CSUM]) {
1371 attrtype = IFLA_GENEVE_UDP_CSUM;
1374 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1375 info->key.tun_flags |= TUNNEL_CSUM;
1378 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1379 #if IS_ENABLED(CONFIG_IPV6)
1381 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1384 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1385 info->key.tun_flags &= ~TUNNEL_CSUM;
1387 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1388 "IPv6 support not enabled in the kernel");
1389 return -EPFNOSUPPORT;
1393 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1394 #if IS_ENABLED(CONFIG_IPV6)
1396 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1399 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1400 *use_udp6_rx_checksums = false;
1402 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1403 "IPv6 support not enabled in the kernel");
1404 return -EPFNOSUPPORT;
1410 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1411 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1415 static void geneve_link_config(struct net_device *dev,
1416 struct ip_tunnel_info *info, struct nlattr *tb[])
1418 struct geneve_dev *geneve = netdev_priv(dev);
1422 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1426 switch (ip_tunnel_info_af(info)) {
1428 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1429 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1431 if (!IS_ERR(rt) && rt->dst.dev) {
1432 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1437 #if IS_ENABLED(CONFIG_IPV6)
1439 struct rt6_info *rt;
1441 if (!__in6_dev_get(dev))
1444 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1447 if (rt && rt->dst.dev)
1448 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1458 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1461 static int geneve_newlink(struct net *net, struct net_device *dev,
1462 struct nlattr *tb[], struct nlattr *data[],
1463 struct netlink_ext_ack *extack)
1465 bool use_udp6_rx_checksums = false;
1466 struct ip_tunnel_info info;
1467 bool metadata = false;
1470 init_tnl_info(&info, GENEVE_UDP_PORT);
1471 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1472 &use_udp6_rx_checksums, false);
1476 err = geneve_configure(net, dev, extack, &info, metadata,
1477 use_udp6_rx_checksums);
1481 geneve_link_config(dev, &info, tb);
1486 /* Quiesces the geneve device data path for both TX and RX.
1488 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1489 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1490 * to complete for the existing set of in-flight packets to be transmitted,
1491 * then we would have quiesced the transmit data path. All the future packets
1492 * will get dropped until we unquiesce the data path.
1494 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1495 * if we set that to NULL under RCU and wait for synchronize_net() to
1496 * complete, then we would have quiesced the receive data path.
1498 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1499 struct geneve_sock **gs6)
1501 *gs4 = rtnl_dereference(geneve->sock4);
1502 rcu_assign_pointer(geneve->sock4, NULL);
1504 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1505 #if IS_ENABLED(CONFIG_IPV6)
1506 *gs6 = rtnl_dereference(geneve->sock6);
1507 rcu_assign_pointer(geneve->sock6, NULL);
1509 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1516 /* Resumes the geneve device data path for both TX and RX. */
1517 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1518 struct geneve_sock __maybe_unused *gs6)
1520 rcu_assign_pointer(geneve->sock4, gs4);
1522 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1523 #if IS_ENABLED(CONFIG_IPV6)
1524 rcu_assign_pointer(geneve->sock6, gs6);
1526 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1531 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1532 struct nlattr *data[],
1533 struct netlink_ext_ack *extack)
1535 struct geneve_dev *geneve = netdev_priv(dev);
1536 struct geneve_sock *gs4, *gs6;
1537 struct ip_tunnel_info info;
1539 bool use_udp6_rx_checksums;
1542 /* If the geneve device is configured for metadata (or externally
1543 * controlled, for example, OVS), then nothing can be changed.
1545 if (geneve->collect_md)
1548 /* Start with the existing info. */
1549 memcpy(&info, &geneve->info, sizeof(info));
1550 metadata = geneve->collect_md;
1551 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1552 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1553 &use_udp6_rx_checksums, true);
1557 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1558 dst_cache_reset(&info.dst_cache);
1559 geneve_link_config(dev, &info, tb);
1562 geneve_quiesce(geneve, &gs4, &gs6);
1563 geneve->info = info;
1564 geneve->collect_md = metadata;
1565 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1566 geneve_unquiesce(geneve, gs4, gs6);
1571 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1573 struct geneve_dev *geneve = netdev_priv(dev);
1575 list_del(&geneve->next);
1576 unregister_netdevice_queue(dev, head);
1579 static size_t geneve_get_size(const struct net_device *dev)
1581 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1582 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1583 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1584 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1585 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1586 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1587 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1588 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1589 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1590 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1594 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1596 struct geneve_dev *geneve = netdev_priv(dev);
1597 struct ip_tunnel_info *info = &geneve->info;
1598 bool metadata = geneve->collect_md;
1602 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1603 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1604 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1605 goto nla_put_failure;
1607 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1608 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1609 info->key.u.ipv4.dst))
1610 goto nla_put_failure;
1611 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1612 !!(info->key.tun_flags & TUNNEL_CSUM)))
1613 goto nla_put_failure;
1615 #if IS_ENABLED(CONFIG_IPV6)
1616 } else if (!metadata) {
1617 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1618 &info->key.u.ipv6.dst))
1619 goto nla_put_failure;
1620 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1621 !(info->key.tun_flags & TUNNEL_CSUM)))
1622 goto nla_put_failure;
1626 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1627 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1628 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1629 goto nla_put_failure;
1631 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1632 goto nla_put_failure;
1634 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1635 goto nla_put_failure;
1637 #if IS_ENABLED(CONFIG_IPV6)
1638 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1639 !geneve->use_udp6_rx_checksums))
1640 goto nla_put_failure;
1649 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1651 .maxtype = IFLA_GENEVE_MAX,
1652 .policy = geneve_policy,
1653 .priv_size = sizeof(struct geneve_dev),
1654 .setup = geneve_setup,
1655 .validate = geneve_validate,
1656 .newlink = geneve_newlink,
1657 .changelink = geneve_changelink,
1658 .dellink = geneve_dellink,
1659 .get_size = geneve_get_size,
1660 .fill_info = geneve_fill_info,
1663 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1664 u8 name_assign_type, u16 dst_port)
1666 struct nlattr *tb[IFLA_MAX + 1];
1667 struct ip_tunnel_info info;
1668 struct net_device *dev;
1669 LIST_HEAD(list_kill);
1672 memset(tb, 0, sizeof(tb));
1673 dev = rtnl_create_link(net, name, name_assign_type,
1674 &geneve_link_ops, tb);
1678 init_tnl_info(&info, dst_port);
1679 err = geneve_configure(net, dev, NULL, &info, true, true);
1682 return ERR_PTR(err);
1685 /* openvswitch users expect packet sizes to be unrestricted,
1686 * so set the largest MTU we can.
1688 err = geneve_change_mtu(dev, IP_MAX_MTU);
1692 err = rtnl_configure_link(dev, NULL);
1698 geneve_dellink(dev, &list_kill);
1699 unregister_netdevice_many(&list_kill);
1700 return ERR_PTR(err);
1702 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1704 static int geneve_netdevice_event(struct notifier_block *unused,
1705 unsigned long event, void *ptr)
1707 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1709 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1710 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1711 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1712 } else if (event == NETDEV_UNREGISTER) {
1713 geneve_offload_rx_ports(dev, false);
1714 } else if (event == NETDEV_REGISTER) {
1715 geneve_offload_rx_ports(dev, true);
1721 static struct notifier_block geneve_notifier_block __read_mostly = {
1722 .notifier_call = geneve_netdevice_event,
1725 static __net_init int geneve_init_net(struct net *net)
1727 struct geneve_net *gn = net_generic(net, geneve_net_id);
1729 INIT_LIST_HEAD(&gn->geneve_list);
1730 INIT_LIST_HEAD(&gn->sock_list);
1734 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1736 struct geneve_net *gn = net_generic(net, geneve_net_id);
1737 struct geneve_dev *geneve, *next;
1738 struct net_device *dev, *aux;
1740 /* gather any geneve devices that were moved into this ns */
1741 for_each_netdev_safe(net, dev, aux)
1742 if (dev->rtnl_link_ops == &geneve_link_ops)
1743 unregister_netdevice_queue(dev, head);
1745 /* now gather any other geneve devices that were created in this ns */
1746 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1747 /* If geneve->dev is in the same netns, it was already added
1748 * to the list by the previous loop.
1750 if (!net_eq(dev_net(geneve->dev), net))
1751 unregister_netdevice_queue(geneve->dev, head);
1755 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1761 list_for_each_entry(net, net_list, exit_list)
1762 geneve_destroy_tunnels(net, &list);
1764 /* unregister the devices gathered above */
1765 unregister_netdevice_many(&list);
1768 list_for_each_entry(net, net_list, exit_list) {
1769 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1771 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1775 static struct pernet_operations geneve_net_ops = {
1776 .init = geneve_init_net,
1777 .exit_batch = geneve_exit_batch_net,
1778 .id = &geneve_net_id,
1779 .size = sizeof(struct geneve_net),
1782 static int __init geneve_init_module(void)
1786 rc = register_pernet_subsys(&geneve_net_ops);
1790 rc = register_netdevice_notifier(&geneve_notifier_block);
1794 rc = rtnl_link_register(&geneve_link_ops);
1800 unregister_netdevice_notifier(&geneve_notifier_block);
1802 unregister_pernet_subsys(&geneve_net_ops);
1806 late_initcall(geneve_init_module);
1808 static void __exit geneve_cleanup_module(void)
1810 rtnl_link_unregister(&geneve_link_ops);
1811 unregister_netdevice_notifier(&geneve_notifier_block);
1812 unregister_pernet_subsys(&geneve_net_ops);
1814 module_exit(geneve_cleanup_module);
1816 MODULE_LICENSE("GPL");
1817 MODULE_VERSION(GENEVE_NETDEV_VER);
1818 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1819 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1820 MODULE_ALIAS_RTNL_LINK("geneve");