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 /* Save offset of outer header relative to skb->head,
265 * because we are going to reset the network header to the inner header
266 * and might change skb->head.
268 nh = skb_network_header(skb) - skb->head;
270 skb_reset_network_header(skb);
272 if (!pskb_inet_may_pull(skb)) {
273 DEV_STATS_INC(geneve->dev, rx_length_errors);
274 DEV_STATS_INC(geneve->dev, rx_errors);
278 /* Get the outer header. */
279 oiph = skb->head + nh;
281 if (geneve_get_sk_family(gs) == AF_INET)
282 err = IP_ECN_decapsulate(oiph, skb);
283 #if IS_ENABLED(CONFIG_IPV6)
285 err = IP6_ECN_decapsulate(oiph, skb);
290 if (geneve_get_sk_family(gs) == AF_INET)
291 net_info_ratelimited("non-ECT from %pI4 "
293 &((struct iphdr *)oiph)->saddr,
294 ((struct iphdr *)oiph)->tos);
295 #if IS_ENABLED(CONFIG_IPV6)
297 net_info_ratelimited("non-ECT from %pI6\n",
298 &((struct ipv6hdr *)oiph)->saddr);
302 ++geneve->dev->stats.rx_frame_errors;
303 ++geneve->dev->stats.rx_errors;
309 err = gro_cells_receive(&geneve->gro_cells, skb);
310 if (likely(err == NET_RX_SUCCESS)) {
311 stats = this_cpu_ptr(geneve->dev->tstats);
312 u64_stats_update_begin(&stats->syncp);
314 stats->rx_bytes += len;
315 u64_stats_update_end(&stats->syncp);
319 /* Consume bad packet */
323 /* Setup stats when device is created */
324 static int geneve_init(struct net_device *dev)
326 struct geneve_dev *geneve = netdev_priv(dev);
329 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
333 err = gro_cells_init(&geneve->gro_cells, dev);
335 free_percpu(dev->tstats);
339 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
341 free_percpu(dev->tstats);
342 gro_cells_destroy(&geneve->gro_cells);
348 static void geneve_uninit(struct net_device *dev)
350 struct geneve_dev *geneve = netdev_priv(dev);
352 dst_cache_destroy(&geneve->info.dst_cache);
353 gro_cells_destroy(&geneve->gro_cells);
354 free_percpu(dev->tstats);
357 /* Callback from net/ipv4/udp.c to receive packets */
358 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
360 struct genevehdr *geneveh;
361 struct geneve_dev *geneve;
362 struct geneve_sock *gs;
365 /* Need UDP and Geneve header to be present */
366 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
369 /* Return packets with reserved bits set */
370 geneveh = geneve_hdr(skb);
371 if (unlikely(geneveh->ver != GENEVE_VER))
374 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
377 gs = rcu_dereference_sk_user_data(sk);
381 geneve = geneve_lookup_skb(gs, skb);
385 opts_len = geneveh->opt_len * 4;
386 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
388 !net_eq(geneve->net, dev_net(geneve->dev)))) {
389 geneve->dev->stats.rx_dropped++;
393 geneve_rx(geneve, gs, skb);
397 /* Consume bad packet */
402 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
403 __be16 port, bool ipv6_rx_csum)
406 struct udp_port_cfg udp_conf;
409 memset(&udp_conf, 0, sizeof(udp_conf));
412 udp_conf.family = AF_INET6;
413 udp_conf.ipv6_v6only = 1;
414 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
416 udp_conf.family = AF_INET;
417 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
420 udp_conf.local_udp_port = port;
422 /* Open UDP socket */
423 err = udp_sock_create(net, &udp_conf, &sock);
430 static int geneve_hlen(struct genevehdr *gh)
432 return sizeof(*gh) + gh->opt_len * 4;
435 static struct sk_buff *geneve_gro_receive(struct sock *sk,
436 struct list_head *head,
439 struct sk_buff *pp = NULL;
441 struct genevehdr *gh, *gh2;
442 unsigned int hlen, gh_len, off_gnv;
443 const struct packet_offload *ptype;
447 off_gnv = skb_gro_offset(skb);
448 hlen = off_gnv + sizeof(*gh);
449 gh = skb_gro_header_fast(skb, off_gnv);
450 if (skb_gro_header_hard(skb, hlen)) {
451 gh = skb_gro_header_slow(skb, hlen, off_gnv);
456 if (gh->ver != GENEVE_VER || gh->oam)
458 gh_len = geneve_hlen(gh);
460 hlen = off_gnv + gh_len;
461 if (skb_gro_header_hard(skb, hlen)) {
462 gh = skb_gro_header_slow(skb, hlen, off_gnv);
467 list_for_each_entry(p, head, list) {
468 if (!NAPI_GRO_CB(p)->same_flow)
471 gh2 = (struct genevehdr *)(p->data + off_gnv);
472 if (gh->opt_len != gh2->opt_len ||
473 memcmp(gh, gh2, gh_len)) {
474 NAPI_GRO_CB(p)->same_flow = 0;
479 type = gh->proto_type;
482 ptype = gro_find_receive_by_type(type);
486 skb_gro_pull(skb, gh_len);
487 skb_gro_postpull_rcsum(skb, gh, gh_len);
488 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
494 skb_gro_flush_final(skb, pp, flush);
499 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
502 struct genevehdr *gh;
503 struct packet_offload *ptype;
508 gh = (struct genevehdr *)(skb->data + nhoff);
509 gh_len = geneve_hlen(gh);
510 type = gh->proto_type;
513 ptype = gro_find_complete_by_type(type);
515 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
519 skb_set_inner_mac_header(skb, nhoff + gh_len);
524 /* Create new listen socket if needed */
525 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
526 bool ipv6, bool ipv6_rx_csum)
528 struct geneve_net *gn = net_generic(net, geneve_net_id);
529 struct geneve_sock *gs;
531 struct udp_tunnel_sock_cfg tunnel_cfg;
534 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
536 return ERR_PTR(-ENOMEM);
538 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
541 return ERR_CAST(sock);
546 for (h = 0; h < VNI_HASH_SIZE; ++h)
547 INIT_HLIST_HEAD(&gs->vni_list[h]);
549 /* Initialize the geneve udp offloads structure */
550 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
552 /* Mark socket as an encapsulation socket */
553 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
554 tunnel_cfg.sk_user_data = gs;
555 tunnel_cfg.encap_type = 1;
556 tunnel_cfg.gro_receive = geneve_gro_receive;
557 tunnel_cfg.gro_complete = geneve_gro_complete;
558 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
559 tunnel_cfg.encap_destroy = NULL;
560 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
561 list_add(&gs->list, &gn->sock_list);
565 static void __geneve_sock_release(struct geneve_sock *gs)
567 if (!gs || --gs->refcnt)
571 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
572 udp_tunnel_sock_release(gs->sock);
576 static void geneve_sock_release(struct geneve_dev *geneve)
578 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
579 #if IS_ENABLED(CONFIG_IPV6)
580 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
582 rcu_assign_pointer(geneve->sock6, NULL);
585 rcu_assign_pointer(geneve->sock4, NULL);
588 __geneve_sock_release(gs4);
589 #if IS_ENABLED(CONFIG_IPV6)
590 __geneve_sock_release(gs6);
594 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
598 struct geneve_sock *gs;
600 list_for_each_entry(gs, &gn->sock_list, list) {
601 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
602 geneve_get_sk_family(gs) == family) {
609 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
611 struct net *net = geneve->net;
612 struct geneve_net *gn = net_generic(net, geneve_net_id);
613 struct geneve_dev_node *node;
614 struct geneve_sock *gs;
618 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
624 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
625 geneve->use_udp6_rx_checksums);
630 gs->collect_md = geneve->collect_md;
631 #if IS_ENABLED(CONFIG_IPV6)
633 rcu_assign_pointer(geneve->sock6, gs);
634 node = &geneve->hlist6;
638 rcu_assign_pointer(geneve->sock4, gs);
639 node = &geneve->hlist4;
641 node->geneve = geneve;
643 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
644 hash = geneve_net_vni_hash(vni);
645 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
649 static int geneve_open(struct net_device *dev)
651 struct geneve_dev *geneve = netdev_priv(dev);
652 bool metadata = geneve->collect_md;
656 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
657 ipv4 = !ipv6 || metadata;
658 #if IS_ENABLED(CONFIG_IPV6)
660 ret = geneve_sock_add(geneve, true);
661 if (ret < 0 && ret != -EAFNOSUPPORT)
666 ret = geneve_sock_add(geneve, false);
668 geneve_sock_release(geneve);
673 static int geneve_stop(struct net_device *dev)
675 struct geneve_dev *geneve = netdev_priv(dev);
677 hlist_del_init_rcu(&geneve->hlist4.hlist);
678 #if IS_ENABLED(CONFIG_IPV6)
679 hlist_del_init_rcu(&geneve->hlist6.hlist);
681 geneve_sock_release(geneve);
685 static void geneve_build_header(struct genevehdr *geneveh,
686 const struct ip_tunnel_info *info)
688 geneveh->ver = GENEVE_VER;
689 geneveh->opt_len = info->options_len / 4;
690 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
691 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
693 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
694 geneveh->proto_type = htons(ETH_P_TEB);
697 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
698 ip_tunnel_info_opts_get(geneveh->options, info);
701 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
702 const struct ip_tunnel_info *info,
703 bool xnet, int ip_hdr_len)
705 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
706 struct genevehdr *gnvh;
710 skb_reset_mac_header(skb);
711 skb_scrub_packet(skb, xnet);
713 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
714 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
715 err = skb_cow_head(skb, min_headroom);
719 err = udp_tunnel_handle_offloads(skb, udp_sum);
723 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
724 geneve_build_header(gnvh, info);
725 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
733 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
734 struct net_device *dev,
735 struct geneve_sock *gs4,
737 const struct ip_tunnel_info *info,
738 __be16 dport, __be16 sport)
740 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
741 struct geneve_dev *geneve = netdev_priv(dev);
742 struct dst_cache *dst_cache;
743 struct rtable *rt = NULL;
747 return ERR_PTR(-EIO);
749 memset(fl4, 0, sizeof(*fl4));
750 fl4->flowi4_mark = skb->mark;
751 fl4->flowi4_proto = IPPROTO_UDP;
752 fl4->daddr = info->key.u.ipv4.dst;
753 fl4->saddr = info->key.u.ipv4.src;
754 fl4->fl4_dport = dport;
755 fl4->fl4_sport = sport;
758 if ((tos == 1) && !geneve->collect_md) {
759 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
762 fl4->flowi4_tos = RT_TOS(tos);
764 dst_cache = (struct dst_cache *)&info->dst_cache;
766 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
770 rt = ip_route_output_key(geneve->net, fl4);
772 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
773 return ERR_PTR(-ENETUNREACH);
775 if (rt->dst.dev == dev) { /* is this necessary? */
776 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
778 return ERR_PTR(-ELOOP);
781 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
785 #if IS_ENABLED(CONFIG_IPV6)
786 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
787 struct net_device *dev,
788 struct geneve_sock *gs6,
790 const struct ip_tunnel_info *info,
791 __be16 dport, __be16 sport)
793 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
794 struct geneve_dev *geneve = netdev_priv(dev);
795 struct dst_entry *dst = NULL;
796 struct dst_cache *dst_cache;
800 return ERR_PTR(-EIO);
802 memset(fl6, 0, sizeof(*fl6));
803 fl6->flowi6_mark = skb->mark;
804 fl6->flowi6_proto = IPPROTO_UDP;
805 fl6->daddr = info->key.u.ipv6.dst;
806 fl6->saddr = info->key.u.ipv6.src;
807 fl6->fl6_dport = dport;
808 fl6->fl6_sport = sport;
810 prio = info->key.tos;
811 if ((prio == 1) && !geneve->collect_md) {
812 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
816 fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
817 dst_cache = (struct dst_cache *)&info->dst_cache;
819 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
823 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
826 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
827 return ERR_PTR(-ENETUNREACH);
829 if (dst->dev == dev) { /* is this necessary? */
830 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
832 return ERR_PTR(-ELOOP);
836 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
841 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
842 struct geneve_dev *geneve,
843 const struct ip_tunnel_info *info)
845 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
846 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
847 const struct ip_tunnel_key *key = &info->key;
855 if (!skb_vlan_inet_prepare(skb))
858 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
859 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
860 geneve->info.key.tp_dst, sport);
864 skb_tunnel_check_pmtu(skb, &rt->dst,
865 GENEVE_IPV4_HLEN + info->options_len);
867 if (geneve->collect_md) {
868 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
871 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
872 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
874 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
876 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
880 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
881 tos, ttl, df, sport, geneve->info.key.tp_dst,
882 !net_eq(geneve->net, dev_net(geneve->dev)),
883 !(info->key.tun_flags & TUNNEL_CSUM));
887 #if IS_ENABLED(CONFIG_IPV6)
888 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
889 struct geneve_dev *geneve,
890 const struct ip_tunnel_info *info)
892 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
893 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
894 const struct ip_tunnel_key *key = &info->key;
895 struct dst_entry *dst = NULL;
901 if (!skb_vlan_inet_prepare(skb))
904 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
905 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
906 geneve->info.key.tp_dst, sport);
910 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
912 if (geneve->collect_md) {
913 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
916 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
918 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
920 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
924 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
925 &fl6.saddr, &fl6.daddr, prio, ttl,
926 info->key.label, sport, geneve->info.key.tp_dst,
927 !(info->key.tun_flags & TUNNEL_CSUM));
932 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
934 struct geneve_dev *geneve = netdev_priv(dev);
935 struct ip_tunnel_info *info = NULL;
938 if (geneve->collect_md) {
939 info = skb_tunnel_info(skb);
940 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
941 netdev_dbg(dev, "no tunnel metadata\n");
943 dev->stats.tx_dropped++;
947 info = &geneve->info;
951 #if IS_ENABLED(CONFIG_IPV6)
952 if (info->mode & IP_TUNNEL_INFO_IPV6)
953 err = geneve6_xmit_skb(skb, dev, geneve, info);
956 err = geneve_xmit_skb(skb, dev, geneve, info);
965 dev->stats.collisions++;
966 else if (err == -ENETUNREACH)
967 dev->stats.tx_carrier_errors++;
969 dev->stats.tx_errors++;
973 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
975 if (new_mtu > dev->max_mtu)
976 new_mtu = dev->max_mtu;
977 else if (new_mtu < dev->min_mtu)
978 new_mtu = dev->min_mtu;
984 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
986 struct ip_tunnel_info *info = skb_tunnel_info(skb);
987 struct geneve_dev *geneve = netdev_priv(dev);
990 if (ip_tunnel_info_af(info) == AF_INET) {
994 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
995 sport = udp_flow_src_port(geneve->net, skb,
998 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
999 geneve->info.key.tp_dst, sport);
1004 info->key.u.ipv4.src = fl4.saddr;
1005 #if IS_ENABLED(CONFIG_IPV6)
1006 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1007 struct dst_entry *dst;
1010 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1011 sport = udp_flow_src_port(geneve->net, skb,
1012 1, USHRT_MAX, true);
1014 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1015 geneve->info.key.tp_dst, sport);
1017 return PTR_ERR(dst);
1020 info->key.u.ipv6.src = fl6.saddr;
1026 info->key.tp_src = sport;
1027 info->key.tp_dst = geneve->info.key.tp_dst;
1031 static const struct net_device_ops geneve_netdev_ops = {
1032 .ndo_init = geneve_init,
1033 .ndo_uninit = geneve_uninit,
1034 .ndo_open = geneve_open,
1035 .ndo_stop = geneve_stop,
1036 .ndo_start_xmit = geneve_xmit,
1037 .ndo_get_stats64 = ip_tunnel_get_stats64,
1038 .ndo_change_mtu = geneve_change_mtu,
1039 .ndo_validate_addr = eth_validate_addr,
1040 .ndo_set_mac_address = eth_mac_addr,
1041 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1044 static void geneve_get_drvinfo(struct net_device *dev,
1045 struct ethtool_drvinfo *drvinfo)
1047 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1048 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1051 static const struct ethtool_ops geneve_ethtool_ops = {
1052 .get_drvinfo = geneve_get_drvinfo,
1053 .get_link = ethtool_op_get_link,
1056 /* Info for udev, that this is a virtual tunnel endpoint */
1057 static struct device_type geneve_type = {
1061 /* Calls the ndo_udp_tunnel_add of the caller in order to
1062 * supply the listening GENEVE udp ports. Callers are expected
1063 * to implement the ndo_udp_tunnel_add.
1065 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1067 struct net *net = dev_net(dev);
1068 struct geneve_net *gn = net_generic(net, geneve_net_id);
1069 struct geneve_sock *gs;
1072 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1074 udp_tunnel_push_rx_port(dev, gs->sock,
1075 UDP_TUNNEL_TYPE_GENEVE);
1077 udp_tunnel_drop_rx_port(dev, gs->sock,
1078 UDP_TUNNEL_TYPE_GENEVE);
1084 /* Initialize the device structure. */
1085 static void geneve_setup(struct net_device *dev)
1089 dev->netdev_ops = &geneve_netdev_ops;
1090 dev->ethtool_ops = &geneve_ethtool_ops;
1091 dev->needs_free_netdev = true;
1093 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1095 dev->features |= NETIF_F_LLTX;
1096 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1097 dev->features |= NETIF_F_RXCSUM;
1098 dev->features |= NETIF_F_GSO_SOFTWARE;
1100 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1101 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1103 /* MTU range: 68 - (something less than 65535) */
1104 dev->min_mtu = ETH_MIN_MTU;
1105 /* The max_mtu calculation does not take account of GENEVE
1106 * options, to avoid excluding potentially valid
1107 * configurations. This will be further reduced by IPvX hdr size.
1109 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1111 netif_keep_dst(dev);
1112 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1113 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1114 eth_hw_addr_random(dev);
1117 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1118 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1119 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1120 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1121 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1122 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1123 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1124 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1125 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1126 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1127 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1128 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1131 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1132 struct netlink_ext_ack *extack)
1134 if (tb[IFLA_ADDRESS]) {
1135 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1136 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1137 "Provided link layer address is not Ethernet");
1141 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1142 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1143 "Provided Ethernet address is not unicast");
1144 return -EADDRNOTAVAIL;
1149 NL_SET_ERR_MSG(extack,
1150 "Not enough attributes provided to perform the operation");
1154 if (data[IFLA_GENEVE_ID]) {
1155 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1157 if (vni >= GENEVE_N_VID) {
1158 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1159 "Geneve ID must be lower than 16777216");
1167 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1168 const struct ip_tunnel_info *info,
1169 bool *tun_on_same_port,
1170 bool *tun_collect_md)
1172 struct geneve_dev *geneve, *t = NULL;
1174 *tun_on_same_port = false;
1175 *tun_collect_md = false;
1176 list_for_each_entry(geneve, &gn->geneve_list, next) {
1177 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1178 *tun_collect_md = geneve->collect_md;
1179 *tun_on_same_port = true;
1181 if (info->key.tun_id == geneve->info.key.tun_id &&
1182 info->key.tp_dst == geneve->info.key.tp_dst &&
1183 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1189 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1191 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1192 info->key.ttl || info->key.label || info->key.tp_src ||
1193 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1196 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1197 struct ip_tunnel_info *b)
1199 if (ip_tunnel_info_af(a) == AF_INET)
1200 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1202 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1205 static int geneve_configure(struct net *net, struct net_device *dev,
1206 struct netlink_ext_ack *extack,
1207 const struct ip_tunnel_info *info,
1208 bool metadata, bool ipv6_rx_csum)
1210 struct geneve_net *gn = net_generic(net, geneve_net_id);
1211 struct geneve_dev *t, *geneve = netdev_priv(dev);
1212 bool tun_collect_md, tun_on_same_port;
1215 if (metadata && !is_tnl_info_zero(info)) {
1216 NL_SET_ERR_MSG(extack,
1217 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1224 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1228 /* make enough headroom for basic scenario */
1229 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1230 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1231 encap_len += sizeof(struct iphdr);
1232 dev->max_mtu -= sizeof(struct iphdr);
1234 encap_len += sizeof(struct ipv6hdr);
1235 dev->max_mtu -= sizeof(struct ipv6hdr);
1237 dev->needed_headroom = encap_len + ETH_HLEN;
1240 if (tun_on_same_port) {
1241 NL_SET_ERR_MSG(extack,
1242 "There can be only one externally controlled device on a destination port");
1246 if (tun_collect_md) {
1247 NL_SET_ERR_MSG(extack,
1248 "There already exists an externally controlled device on this destination port");
1253 dst_cache_reset(&geneve->info.dst_cache);
1254 geneve->info = *info;
1255 geneve->collect_md = metadata;
1256 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1258 err = register_netdevice(dev);
1262 list_add(&geneve->next, &gn->geneve_list);
1266 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1268 memset(info, 0, sizeof(*info));
1269 info->key.tp_dst = htons(dst_port);
1272 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1273 struct netlink_ext_ack *extack,
1274 struct ip_tunnel_info *info, bool *metadata,
1275 bool *use_udp6_rx_checksums, bool changelink)
1279 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1280 NL_SET_ERR_MSG(extack,
1281 "Cannot specify both IPv4 and IPv6 Remote addresses");
1285 if (data[IFLA_GENEVE_REMOTE]) {
1286 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1287 attrtype = IFLA_GENEVE_REMOTE;
1291 info->key.u.ipv4.dst =
1292 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1294 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1295 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1296 "Remote IPv4 address cannot be Multicast");
1301 if (data[IFLA_GENEVE_REMOTE6]) {
1302 #if IS_ENABLED(CONFIG_IPV6)
1303 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1304 attrtype = IFLA_GENEVE_REMOTE6;
1308 info->mode = IP_TUNNEL_INFO_IPV6;
1309 info->key.u.ipv6.dst =
1310 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1312 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1313 IPV6_ADDR_LINKLOCAL) {
1314 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1315 "Remote IPv6 address cannot be link-local");
1318 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1319 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1320 "Remote IPv6 address cannot be Multicast");
1323 info->key.tun_flags |= TUNNEL_CSUM;
1324 *use_udp6_rx_checksums = true;
1326 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1327 "IPv6 support not enabled in the kernel");
1328 return -EPFNOSUPPORT;
1332 if (data[IFLA_GENEVE_ID]) {
1337 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1338 tvni[0] = (vni & 0x00ff0000) >> 16;
1339 tvni[1] = (vni & 0x0000ff00) >> 8;
1340 tvni[2] = vni & 0x000000ff;
1342 tunid = vni_to_tunnel_id(tvni);
1343 if (changelink && (tunid != info->key.tun_id)) {
1344 attrtype = IFLA_GENEVE_ID;
1347 info->key.tun_id = tunid;
1350 if (data[IFLA_GENEVE_TTL])
1351 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1353 if (data[IFLA_GENEVE_TOS])
1354 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1356 if (data[IFLA_GENEVE_LABEL]) {
1357 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1358 IPV6_FLOWLABEL_MASK;
1359 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1360 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1361 "Label attribute only applies for IPv6 Geneve devices");
1366 if (data[IFLA_GENEVE_PORT]) {
1368 attrtype = IFLA_GENEVE_PORT;
1371 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1374 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1376 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1382 if (data[IFLA_GENEVE_UDP_CSUM]) {
1384 attrtype = IFLA_GENEVE_UDP_CSUM;
1387 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1388 info->key.tun_flags |= TUNNEL_CSUM;
1391 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1392 #if IS_ENABLED(CONFIG_IPV6)
1394 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1397 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1398 info->key.tun_flags &= ~TUNNEL_CSUM;
1400 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1401 "IPv6 support not enabled in the kernel");
1402 return -EPFNOSUPPORT;
1406 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1407 #if IS_ENABLED(CONFIG_IPV6)
1409 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1412 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1413 *use_udp6_rx_checksums = false;
1415 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1416 "IPv6 support not enabled in the kernel");
1417 return -EPFNOSUPPORT;
1423 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1424 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1428 static void geneve_link_config(struct net_device *dev,
1429 struct ip_tunnel_info *info, struct nlattr *tb[])
1431 struct geneve_dev *geneve = netdev_priv(dev);
1435 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1439 switch (ip_tunnel_info_af(info)) {
1441 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1442 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1444 if (!IS_ERR(rt) && rt->dst.dev) {
1445 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1450 #if IS_ENABLED(CONFIG_IPV6)
1452 struct rt6_info *rt;
1454 if (!__in6_dev_get(dev))
1457 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1460 if (rt && rt->dst.dev)
1461 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1471 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1474 static int geneve_newlink(struct net *net, struct net_device *dev,
1475 struct nlattr *tb[], struct nlattr *data[],
1476 struct netlink_ext_ack *extack)
1478 bool use_udp6_rx_checksums = false;
1479 struct ip_tunnel_info info;
1480 bool metadata = false;
1483 init_tnl_info(&info, GENEVE_UDP_PORT);
1484 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1485 &use_udp6_rx_checksums, false);
1489 err = geneve_configure(net, dev, extack, &info, metadata,
1490 use_udp6_rx_checksums);
1494 geneve_link_config(dev, &info, tb);
1499 /* Quiesces the geneve device data path for both TX and RX.
1501 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1502 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1503 * to complete for the existing set of in-flight packets to be transmitted,
1504 * then we would have quiesced the transmit data path. All the future packets
1505 * will get dropped until we unquiesce the data path.
1507 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1508 * if we set that to NULL under RCU and wait for synchronize_net() to
1509 * complete, then we would have quiesced the receive data path.
1511 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1512 struct geneve_sock **gs6)
1514 *gs4 = rtnl_dereference(geneve->sock4);
1515 rcu_assign_pointer(geneve->sock4, NULL);
1517 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1518 #if IS_ENABLED(CONFIG_IPV6)
1519 *gs6 = rtnl_dereference(geneve->sock6);
1520 rcu_assign_pointer(geneve->sock6, NULL);
1522 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1529 /* Resumes the geneve device data path for both TX and RX. */
1530 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1531 struct geneve_sock __maybe_unused *gs6)
1533 rcu_assign_pointer(geneve->sock4, gs4);
1535 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1536 #if IS_ENABLED(CONFIG_IPV6)
1537 rcu_assign_pointer(geneve->sock6, gs6);
1539 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1544 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1545 struct nlattr *data[],
1546 struct netlink_ext_ack *extack)
1548 struct geneve_dev *geneve = netdev_priv(dev);
1549 struct geneve_sock *gs4, *gs6;
1550 struct ip_tunnel_info info;
1552 bool use_udp6_rx_checksums;
1555 /* If the geneve device is configured for metadata (or externally
1556 * controlled, for example, OVS), then nothing can be changed.
1558 if (geneve->collect_md)
1561 /* Start with the existing info. */
1562 memcpy(&info, &geneve->info, sizeof(info));
1563 metadata = geneve->collect_md;
1564 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1565 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1566 &use_udp6_rx_checksums, true);
1570 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1571 dst_cache_reset(&info.dst_cache);
1572 geneve_link_config(dev, &info, tb);
1575 geneve_quiesce(geneve, &gs4, &gs6);
1576 geneve->info = info;
1577 geneve->collect_md = metadata;
1578 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1579 geneve_unquiesce(geneve, gs4, gs6);
1584 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1586 struct geneve_dev *geneve = netdev_priv(dev);
1588 list_del(&geneve->next);
1589 unregister_netdevice_queue(dev, head);
1592 static size_t geneve_get_size(const struct net_device *dev)
1594 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1595 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1596 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1597 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1598 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1599 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1600 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1601 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1602 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1603 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1607 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1609 struct geneve_dev *geneve = netdev_priv(dev);
1610 struct ip_tunnel_info *info = &geneve->info;
1611 bool metadata = geneve->collect_md;
1615 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1616 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1617 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1618 goto nla_put_failure;
1620 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1621 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1622 info->key.u.ipv4.dst))
1623 goto nla_put_failure;
1624 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1625 !!(info->key.tun_flags & TUNNEL_CSUM)))
1626 goto nla_put_failure;
1628 #if IS_ENABLED(CONFIG_IPV6)
1629 } else if (!metadata) {
1630 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1631 &info->key.u.ipv6.dst))
1632 goto nla_put_failure;
1633 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1634 !(info->key.tun_flags & TUNNEL_CSUM)))
1635 goto nla_put_failure;
1639 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1640 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1641 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1642 goto nla_put_failure;
1644 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1645 goto nla_put_failure;
1647 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1648 goto nla_put_failure;
1650 #if IS_ENABLED(CONFIG_IPV6)
1651 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1652 !geneve->use_udp6_rx_checksums))
1653 goto nla_put_failure;
1662 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1664 .maxtype = IFLA_GENEVE_MAX,
1665 .policy = geneve_policy,
1666 .priv_size = sizeof(struct geneve_dev),
1667 .setup = geneve_setup,
1668 .validate = geneve_validate,
1669 .newlink = geneve_newlink,
1670 .changelink = geneve_changelink,
1671 .dellink = geneve_dellink,
1672 .get_size = geneve_get_size,
1673 .fill_info = geneve_fill_info,
1676 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1677 u8 name_assign_type, u16 dst_port)
1679 struct nlattr *tb[IFLA_MAX + 1];
1680 struct ip_tunnel_info info;
1681 struct net_device *dev;
1682 LIST_HEAD(list_kill);
1685 memset(tb, 0, sizeof(tb));
1686 dev = rtnl_create_link(net, name, name_assign_type,
1687 &geneve_link_ops, tb);
1691 init_tnl_info(&info, dst_port);
1692 err = geneve_configure(net, dev, NULL, &info, true, true);
1695 return ERR_PTR(err);
1698 /* openvswitch users expect packet sizes to be unrestricted,
1699 * so set the largest MTU we can.
1701 err = geneve_change_mtu(dev, IP_MAX_MTU);
1705 err = rtnl_configure_link(dev, NULL);
1711 geneve_dellink(dev, &list_kill);
1712 unregister_netdevice_many(&list_kill);
1713 return ERR_PTR(err);
1715 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1717 static int geneve_netdevice_event(struct notifier_block *unused,
1718 unsigned long event, void *ptr)
1720 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1722 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1723 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1724 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1725 } else if (event == NETDEV_UNREGISTER) {
1726 geneve_offload_rx_ports(dev, false);
1727 } else if (event == NETDEV_REGISTER) {
1728 geneve_offload_rx_ports(dev, true);
1734 static struct notifier_block geneve_notifier_block __read_mostly = {
1735 .notifier_call = geneve_netdevice_event,
1738 static __net_init int geneve_init_net(struct net *net)
1740 struct geneve_net *gn = net_generic(net, geneve_net_id);
1742 INIT_LIST_HEAD(&gn->geneve_list);
1743 INIT_LIST_HEAD(&gn->sock_list);
1747 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1749 struct geneve_net *gn = net_generic(net, geneve_net_id);
1750 struct geneve_dev *geneve, *next;
1751 struct net_device *dev, *aux;
1753 /* gather any geneve devices that were moved into this ns */
1754 for_each_netdev_safe(net, dev, aux)
1755 if (dev->rtnl_link_ops == &geneve_link_ops)
1756 unregister_netdevice_queue(dev, head);
1758 /* now gather any other geneve devices that were created in this ns */
1759 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1760 /* If geneve->dev is in the same netns, it was already added
1761 * to the list by the previous loop.
1763 if (!net_eq(dev_net(geneve->dev), net))
1764 unregister_netdevice_queue(geneve->dev, head);
1768 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1774 list_for_each_entry(net, net_list, exit_list)
1775 geneve_destroy_tunnels(net, &list);
1777 /* unregister the devices gathered above */
1778 unregister_netdevice_many(&list);
1781 list_for_each_entry(net, net_list, exit_list) {
1782 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1784 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1788 static struct pernet_operations geneve_net_ops = {
1789 .init = geneve_init_net,
1790 .exit_batch = geneve_exit_batch_net,
1791 .id = &geneve_net_id,
1792 .size = sizeof(struct geneve_net),
1795 static int __init geneve_init_module(void)
1799 rc = register_pernet_subsys(&geneve_net_ops);
1803 rc = register_netdevice_notifier(&geneve_notifier_block);
1807 rc = rtnl_link_register(&geneve_link_ops);
1813 unregister_netdevice_notifier(&geneve_notifier_block);
1815 unregister_pernet_subsys(&geneve_net_ops);
1819 late_initcall(geneve_init_module);
1821 static void __exit geneve_cleanup_module(void)
1823 rtnl_link_unregister(&geneve_link_ops);
1824 unregister_netdevice_notifier(&geneve_notifier_block);
1825 unregister_pernet_subsys(&geneve_net_ops);
1827 module_exit(geneve_cleanup_module);
1829 MODULE_LICENSE("GPL");
1830 MODULE_VERSION(GENEVE_NETDEV_VER);
1831 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1832 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1833 MODULE_ALIAS_RTNL_LINK("geneve");