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/ipv6_stubs.h>
18 #include <net/dst_metadata.h>
19 #include <net/gro_cells.h>
20 #include <net/rtnetlink.h>
21 #include <net/geneve.h>
22 #include <net/protocol.h>
24 #define GENEVE_NETDEV_VER "0.6"
26 #define GENEVE_N_VID (1u << 24)
27 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
29 #define VNI_HASH_BITS 10
30 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
32 static bool log_ecn_error = true;
33 module_param(log_ecn_error, bool, 0644);
34 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
37 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
38 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
39 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
41 /* per-network namespace private data for this module */
43 struct list_head geneve_list;
44 struct list_head sock_list;
47 static unsigned int geneve_net_id;
49 struct geneve_dev_node {
50 struct hlist_node hlist;
51 struct geneve_dev *geneve;
54 /* Pseudo network device */
56 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
57 #if IS_ENABLED(CONFIG_IPV6)
58 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
60 struct net *net; /* netns for packet i/o */
61 struct net_device *dev; /* netdev for geneve tunnel */
62 struct ip_tunnel_info info;
63 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
64 #if IS_ENABLED(CONFIG_IPV6)
65 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
67 struct list_head next; /* geneve's per namespace list */
68 struct gro_cells gro_cells;
70 bool use_udp6_rx_checksums;
72 enum ifla_geneve_df df;
77 struct list_head list;
81 struct hlist_head vni_list[VNI_HASH_SIZE];
84 static inline __u32 geneve_net_vni_hash(u8 vni[3])
88 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
89 return hash_32(vnid, VNI_HASH_BITS);
92 static __be64 vni_to_tunnel_id(const __u8 *vni)
95 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
97 return (__force __be64)(((__force u64)vni[0] << 40) |
98 ((__force u64)vni[1] << 48) |
99 ((__force u64)vni[2] << 56));
103 /* Convert 64 bit tunnel ID to 24 bit VNI. */
104 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
107 vni[0] = (__force __u8)(tun_id >> 16);
108 vni[1] = (__force __u8)(tun_id >> 8);
109 vni[2] = (__force __u8)tun_id;
111 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
112 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
113 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
117 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
119 return !memcmp(vni, &tun_id[5], 3);
122 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
124 return gs->sock->sk->sk_family;
127 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
128 __be32 addr, u8 vni[])
130 struct hlist_head *vni_list_head;
131 struct geneve_dev_node *node;
134 /* Find the device for this VNI */
135 hash = geneve_net_vni_hash(vni);
136 vni_list_head = &gs->vni_list[hash];
137 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
138 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
139 addr == node->geneve->info.key.u.ipv4.dst)
145 #if IS_ENABLED(CONFIG_IPV6)
146 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
147 struct in6_addr addr6, u8 vni[])
149 struct hlist_head *vni_list_head;
150 struct geneve_dev_node *node;
153 /* Find the device for this VNI */
154 hash = geneve_net_vni_hash(vni);
155 vni_list_head = &gs->vni_list[hash];
156 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
157 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
158 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
165 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
167 return (struct genevehdr *)(udp_hdr(skb) + 1);
170 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
173 static u8 zero_vni[3];
176 if (geneve_get_sk_family(gs) == AF_INET) {
180 iph = ip_hdr(skb); /* outer IP header... */
182 if (gs->collect_md) {
186 vni = geneve_hdr(skb)->vni;
190 return geneve_lookup(gs, addr, vni);
191 #if IS_ENABLED(CONFIG_IPV6)
192 } else if (geneve_get_sk_family(gs) == AF_INET6) {
193 static struct in6_addr zero_addr6;
194 struct ipv6hdr *ip6h;
195 struct in6_addr addr6;
197 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
199 if (gs->collect_md) {
203 vni = geneve_hdr(skb)->vni;
207 return geneve6_lookup(gs, addr6, vni);
213 /* geneve receive/decap routine */
214 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
217 struct genevehdr *gnvh = geneve_hdr(skb);
218 struct metadata_dst *tun_dst = NULL;
219 struct pcpu_sw_netstats *stats;
224 if (ip_tunnel_collect_metadata() || gs->collect_md) {
227 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
228 (gnvh->oam ? TUNNEL_OAM : 0) |
229 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
231 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
232 vni_to_tunnel_id(gnvh->vni),
235 geneve->dev->stats.rx_dropped++;
238 /* Update tunnel dst according to Geneve options. */
239 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
240 gnvh->options, gnvh->opt_len * 4,
243 /* Drop packets w/ critical options,
244 * since we don't support any...
246 if (gnvh->critical) {
247 geneve->dev->stats.rx_frame_errors++;
248 geneve->dev->stats.rx_errors++;
253 skb_reset_mac_header(skb);
254 skb->protocol = eth_type_trans(skb, geneve->dev);
255 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
258 skb_dst_set(skb, &tun_dst->dst);
260 /* Ignore packet loops (and multicast echo) */
261 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
262 geneve->dev->stats.rx_errors++;
266 oiph = skb_network_header(skb);
267 skb_reset_network_header(skb);
269 if (geneve_get_sk_family(gs) == AF_INET)
270 err = IP_ECN_decapsulate(oiph, skb);
271 #if IS_ENABLED(CONFIG_IPV6)
273 err = IP6_ECN_decapsulate(oiph, skb);
278 if (geneve_get_sk_family(gs) == AF_INET)
279 net_info_ratelimited("non-ECT from %pI4 "
281 &((struct iphdr *)oiph)->saddr,
282 ((struct iphdr *)oiph)->tos);
283 #if IS_ENABLED(CONFIG_IPV6)
285 net_info_ratelimited("non-ECT from %pI6\n",
286 &((struct ipv6hdr *)oiph)->saddr);
290 ++geneve->dev->stats.rx_frame_errors;
291 ++geneve->dev->stats.rx_errors;
297 err = gro_cells_receive(&geneve->gro_cells, skb);
298 if (likely(err == NET_RX_SUCCESS)) {
299 stats = this_cpu_ptr(geneve->dev->tstats);
300 u64_stats_update_begin(&stats->syncp);
302 stats->rx_bytes += len;
303 u64_stats_update_end(&stats->syncp);
307 /* Consume bad packet */
311 /* Setup stats when device is created */
312 static int geneve_init(struct net_device *dev)
314 struct geneve_dev *geneve = netdev_priv(dev);
317 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
321 err = gro_cells_init(&geneve->gro_cells, dev);
323 free_percpu(dev->tstats);
327 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
329 free_percpu(dev->tstats);
330 gro_cells_destroy(&geneve->gro_cells);
336 static void geneve_uninit(struct net_device *dev)
338 struct geneve_dev *geneve = netdev_priv(dev);
340 dst_cache_destroy(&geneve->info.dst_cache);
341 gro_cells_destroy(&geneve->gro_cells);
342 free_percpu(dev->tstats);
345 /* Callback from net/ipv4/udp.c to receive packets */
346 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
348 struct genevehdr *geneveh;
349 struct geneve_dev *geneve;
350 struct geneve_sock *gs;
353 /* Need UDP and Geneve header to be present */
354 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
357 /* Return packets with reserved bits set */
358 geneveh = geneve_hdr(skb);
359 if (unlikely(geneveh->ver != GENEVE_VER))
362 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
365 gs = rcu_dereference_sk_user_data(sk);
369 geneve = geneve_lookup_skb(gs, skb);
373 opts_len = geneveh->opt_len * 4;
374 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
376 !net_eq(geneve->net, dev_net(geneve->dev)))) {
377 geneve->dev->stats.rx_dropped++;
381 geneve_rx(geneve, gs, skb);
385 /* Consume bad packet */
390 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
391 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
393 struct genevehdr *geneveh;
394 struct geneve_sock *gs;
395 u8 zero_vni[3] = { 0 };
398 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
401 geneveh = geneve_hdr(skb);
402 if (geneveh->ver != GENEVE_VER)
405 if (geneveh->proto_type != htons(ETH_P_TEB))
408 gs = rcu_dereference_sk_user_data(sk);
412 if (geneve_get_sk_family(gs) == AF_INET) {
413 struct iphdr *iph = ip_hdr(skb);
416 if (!gs->collect_md) {
417 vni = geneve_hdr(skb)->vni;
421 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
424 #if IS_ENABLED(CONFIG_IPV6)
425 if (geneve_get_sk_family(gs) == AF_INET6) {
426 struct ipv6hdr *ip6h = ipv6_hdr(skb);
427 struct in6_addr addr6;
429 memset(&addr6, 0, sizeof(struct in6_addr));
431 if (!gs->collect_md) {
432 vni = geneve_hdr(skb)->vni;
436 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
440 return -EPFNOSUPPORT;
443 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
444 __be16 port, bool ipv6_rx_csum)
447 struct udp_port_cfg udp_conf;
450 memset(&udp_conf, 0, sizeof(udp_conf));
453 udp_conf.family = AF_INET6;
454 udp_conf.ipv6_v6only = 1;
455 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
457 udp_conf.family = AF_INET;
458 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
461 udp_conf.local_udp_port = port;
463 /* Open UDP socket */
464 err = udp_sock_create(net, &udp_conf, &sock);
471 static int geneve_hlen(struct genevehdr *gh)
473 return sizeof(*gh) + gh->opt_len * 4;
476 static struct sk_buff *geneve_gro_receive(struct sock *sk,
477 struct list_head *head,
480 struct sk_buff *pp = NULL;
482 struct genevehdr *gh, *gh2;
483 unsigned int hlen, gh_len, off_gnv;
484 const struct packet_offload *ptype;
488 off_gnv = skb_gro_offset(skb);
489 hlen = off_gnv + sizeof(*gh);
490 gh = skb_gro_header_fast(skb, off_gnv);
491 if (skb_gro_header_hard(skb, hlen)) {
492 gh = skb_gro_header_slow(skb, hlen, off_gnv);
497 if (gh->ver != GENEVE_VER || gh->oam)
499 gh_len = geneve_hlen(gh);
501 hlen = off_gnv + gh_len;
502 if (skb_gro_header_hard(skb, hlen)) {
503 gh = skb_gro_header_slow(skb, hlen, off_gnv);
508 list_for_each_entry(p, head, list) {
509 if (!NAPI_GRO_CB(p)->same_flow)
512 gh2 = (struct genevehdr *)(p->data + off_gnv);
513 if (gh->opt_len != gh2->opt_len ||
514 memcmp(gh, gh2, gh_len)) {
515 NAPI_GRO_CB(p)->same_flow = 0;
520 type = gh->proto_type;
523 ptype = gro_find_receive_by_type(type);
527 skb_gro_pull(skb, gh_len);
528 skb_gro_postpull_rcsum(skb, gh, gh_len);
529 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
535 skb_gro_flush_final(skb, pp, flush);
540 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
543 struct genevehdr *gh;
544 struct packet_offload *ptype;
549 gh = (struct genevehdr *)(skb->data + nhoff);
550 gh_len = geneve_hlen(gh);
551 type = gh->proto_type;
554 ptype = gro_find_complete_by_type(type);
556 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
560 skb_set_inner_mac_header(skb, nhoff + gh_len);
565 /* Create new listen socket if needed */
566 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
567 bool ipv6, bool ipv6_rx_csum)
569 struct geneve_net *gn = net_generic(net, geneve_net_id);
570 struct geneve_sock *gs;
572 struct udp_tunnel_sock_cfg tunnel_cfg;
575 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
577 return ERR_PTR(-ENOMEM);
579 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
582 return ERR_CAST(sock);
587 for (h = 0; h < VNI_HASH_SIZE; ++h)
588 INIT_HLIST_HEAD(&gs->vni_list[h]);
590 /* Initialize the geneve udp offloads structure */
591 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
593 /* Mark socket as an encapsulation socket */
594 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
595 tunnel_cfg.sk_user_data = gs;
596 tunnel_cfg.encap_type = 1;
597 tunnel_cfg.gro_receive = geneve_gro_receive;
598 tunnel_cfg.gro_complete = geneve_gro_complete;
599 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
600 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
601 tunnel_cfg.encap_destroy = NULL;
602 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
603 list_add(&gs->list, &gn->sock_list);
607 static void __geneve_sock_release(struct geneve_sock *gs)
609 if (!gs || --gs->refcnt)
613 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
614 udp_tunnel_sock_release(gs->sock);
618 static void geneve_sock_release(struct geneve_dev *geneve)
620 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
621 #if IS_ENABLED(CONFIG_IPV6)
622 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
624 rcu_assign_pointer(geneve->sock6, NULL);
627 rcu_assign_pointer(geneve->sock4, NULL);
630 __geneve_sock_release(gs4);
631 #if IS_ENABLED(CONFIG_IPV6)
632 __geneve_sock_release(gs6);
636 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
640 struct geneve_sock *gs;
642 list_for_each_entry(gs, &gn->sock_list, list) {
643 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
644 geneve_get_sk_family(gs) == family) {
651 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
653 struct net *net = geneve->net;
654 struct geneve_net *gn = net_generic(net, geneve_net_id);
655 struct geneve_dev_node *node;
656 struct geneve_sock *gs;
660 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
666 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
667 geneve->use_udp6_rx_checksums);
672 gs->collect_md = geneve->collect_md;
673 #if IS_ENABLED(CONFIG_IPV6)
675 rcu_assign_pointer(geneve->sock6, gs);
676 node = &geneve->hlist6;
680 rcu_assign_pointer(geneve->sock4, gs);
681 node = &geneve->hlist4;
683 node->geneve = geneve;
685 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
686 hash = geneve_net_vni_hash(vni);
687 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
691 static int geneve_open(struct net_device *dev)
693 struct geneve_dev *geneve = netdev_priv(dev);
694 bool metadata = geneve->collect_md;
698 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
699 ipv4 = !ipv6 || metadata;
700 #if IS_ENABLED(CONFIG_IPV6)
702 ret = geneve_sock_add(geneve, true);
703 if (ret < 0 && ret != -EAFNOSUPPORT)
708 ret = geneve_sock_add(geneve, false);
710 geneve_sock_release(geneve);
715 static int geneve_stop(struct net_device *dev)
717 struct geneve_dev *geneve = netdev_priv(dev);
719 hlist_del_init_rcu(&geneve->hlist4.hlist);
720 #if IS_ENABLED(CONFIG_IPV6)
721 hlist_del_init_rcu(&geneve->hlist6.hlist);
723 geneve_sock_release(geneve);
727 static void geneve_build_header(struct genevehdr *geneveh,
728 const struct ip_tunnel_info *info)
730 geneveh->ver = GENEVE_VER;
731 geneveh->opt_len = info->options_len / 4;
732 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
733 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
735 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
736 geneveh->proto_type = htons(ETH_P_TEB);
739 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
740 ip_tunnel_info_opts_get(geneveh->options, info);
743 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
744 const struct ip_tunnel_info *info,
745 bool xnet, int ip_hdr_len)
747 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
748 struct genevehdr *gnvh;
752 skb_reset_mac_header(skb);
753 skb_scrub_packet(skb, xnet);
755 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
756 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
757 err = skb_cow_head(skb, min_headroom);
761 err = udp_tunnel_handle_offloads(skb, udp_sum);
765 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
766 geneve_build_header(gnvh, info);
767 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
775 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
776 struct net_device *dev,
777 struct geneve_sock *gs4,
779 const struct ip_tunnel_info *info)
781 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
782 struct geneve_dev *geneve = netdev_priv(dev);
783 struct dst_cache *dst_cache;
784 struct rtable *rt = NULL;
788 return ERR_PTR(-EIO);
790 memset(fl4, 0, sizeof(*fl4));
791 fl4->flowi4_mark = skb->mark;
792 fl4->flowi4_proto = IPPROTO_UDP;
793 fl4->daddr = info->key.u.ipv4.dst;
794 fl4->saddr = info->key.u.ipv4.src;
797 if ((tos == 1) && !geneve->collect_md) {
798 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
801 fl4->flowi4_tos = RT_TOS(tos);
803 dst_cache = (struct dst_cache *)&info->dst_cache;
805 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
809 rt = ip_route_output_key(geneve->net, fl4);
811 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
812 return ERR_PTR(-ENETUNREACH);
814 if (rt->dst.dev == dev) { /* is this necessary? */
815 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
817 return ERR_PTR(-ELOOP);
820 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
824 #if IS_ENABLED(CONFIG_IPV6)
825 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
826 struct net_device *dev,
827 struct geneve_sock *gs6,
829 const struct ip_tunnel_info *info)
831 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
832 struct geneve_dev *geneve = netdev_priv(dev);
833 struct dst_entry *dst = NULL;
834 struct dst_cache *dst_cache;
838 return ERR_PTR(-EIO);
840 memset(fl6, 0, sizeof(*fl6));
841 fl6->flowi6_mark = skb->mark;
842 fl6->flowi6_proto = IPPROTO_UDP;
843 fl6->daddr = info->key.u.ipv6.dst;
844 fl6->saddr = info->key.u.ipv6.src;
845 prio = info->key.tos;
846 if ((prio == 1) && !geneve->collect_md) {
847 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
851 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
853 dst_cache = (struct dst_cache *)&info->dst_cache;
855 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
859 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
860 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
861 return ERR_PTR(-ENETUNREACH);
863 if (dst->dev == dev) { /* is this necessary? */
864 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
866 return ERR_PTR(-ELOOP);
870 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
875 static int geneve_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 *gs4 = rcu_dereference(geneve->sock4);
881 const struct ip_tunnel_key *key = &info->key;
889 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
893 skb_tunnel_check_pmtu(skb, &rt->dst,
894 GENEVE_IPV4_HLEN + info->options_len);
896 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
897 if (geneve->collect_md) {
898 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
901 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
903 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
904 if (geneve->ttl_inherit)
905 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
908 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
910 if (geneve->df == GENEVE_DF_SET) {
912 } else if (geneve->df == GENEVE_DF_INHERIT) {
913 struct ethhdr *eth = eth_hdr(skb);
915 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
917 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
918 struct iphdr *iph = ip_hdr(skb);
920 if (iph->frag_off & htons(IP_DF))
926 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
930 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
931 tos, ttl, df, sport, geneve->info.key.tp_dst,
932 !net_eq(geneve->net, dev_net(geneve->dev)),
933 !(info->key.tun_flags & TUNNEL_CSUM));
937 #if IS_ENABLED(CONFIG_IPV6)
938 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
939 struct geneve_dev *geneve,
940 const struct ip_tunnel_info *info)
942 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
943 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
944 const struct ip_tunnel_key *key = &info->key;
945 struct dst_entry *dst = NULL;
951 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
955 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
957 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
958 if (geneve->collect_md) {
959 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
962 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
964 if (geneve->ttl_inherit)
965 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
968 ttl = ttl ? : ip6_dst_hoplimit(dst);
970 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
974 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
975 &fl6.saddr, &fl6.daddr, prio, ttl,
976 info->key.label, sport, geneve->info.key.tp_dst,
977 !(info->key.tun_flags & TUNNEL_CSUM));
982 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
984 struct geneve_dev *geneve = netdev_priv(dev);
985 struct ip_tunnel_info *info = NULL;
988 if (geneve->collect_md) {
989 info = skb_tunnel_info(skb);
990 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
992 netdev_dbg(dev, "no tunnel metadata\n");
996 info = &geneve->info;
1000 #if IS_ENABLED(CONFIG_IPV6)
1001 if (info->mode & IP_TUNNEL_INFO_IPV6)
1002 err = geneve6_xmit_skb(skb, dev, geneve, info);
1005 err = geneve_xmit_skb(skb, dev, geneve, info);
1009 return NETDEV_TX_OK;
1014 dev->stats.collisions++;
1015 else if (err == -ENETUNREACH)
1016 dev->stats.tx_carrier_errors++;
1018 dev->stats.tx_errors++;
1019 return NETDEV_TX_OK;
1022 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1024 if (new_mtu > dev->max_mtu)
1025 new_mtu = dev->max_mtu;
1026 else if (new_mtu < dev->min_mtu)
1027 new_mtu = dev->min_mtu;
1033 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1035 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1036 struct geneve_dev *geneve = netdev_priv(dev);
1038 if (ip_tunnel_info_af(info) == AF_INET) {
1041 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1043 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1048 info->key.u.ipv4.src = fl4.saddr;
1049 #if IS_ENABLED(CONFIG_IPV6)
1050 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1051 struct dst_entry *dst;
1053 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1055 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1057 return PTR_ERR(dst);
1060 info->key.u.ipv6.src = fl6.saddr;
1066 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1067 1, USHRT_MAX, true);
1068 info->key.tp_dst = geneve->info.key.tp_dst;
1072 static const struct net_device_ops geneve_netdev_ops = {
1073 .ndo_init = geneve_init,
1074 .ndo_uninit = geneve_uninit,
1075 .ndo_open = geneve_open,
1076 .ndo_stop = geneve_stop,
1077 .ndo_start_xmit = geneve_xmit,
1078 .ndo_get_stats64 = ip_tunnel_get_stats64,
1079 .ndo_change_mtu = geneve_change_mtu,
1080 .ndo_validate_addr = eth_validate_addr,
1081 .ndo_set_mac_address = eth_mac_addr,
1082 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1085 static void geneve_get_drvinfo(struct net_device *dev,
1086 struct ethtool_drvinfo *drvinfo)
1088 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1089 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1092 static const struct ethtool_ops geneve_ethtool_ops = {
1093 .get_drvinfo = geneve_get_drvinfo,
1094 .get_link = ethtool_op_get_link,
1097 /* Info for udev, that this is a virtual tunnel endpoint */
1098 static struct device_type geneve_type = {
1102 /* Calls the ndo_udp_tunnel_add of the caller in order to
1103 * supply the listening GENEVE udp ports. Callers are expected
1104 * to implement the ndo_udp_tunnel_add.
1106 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1108 struct net *net = dev_net(dev);
1109 struct geneve_net *gn = net_generic(net, geneve_net_id);
1110 struct geneve_sock *gs;
1113 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1115 udp_tunnel_push_rx_port(dev, gs->sock,
1116 UDP_TUNNEL_TYPE_GENEVE);
1118 udp_tunnel_drop_rx_port(dev, gs->sock,
1119 UDP_TUNNEL_TYPE_GENEVE);
1125 /* Initialize the device structure. */
1126 static void geneve_setup(struct net_device *dev)
1130 dev->netdev_ops = &geneve_netdev_ops;
1131 dev->ethtool_ops = &geneve_ethtool_ops;
1132 dev->needs_free_netdev = true;
1134 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1136 dev->features |= NETIF_F_LLTX;
1137 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1138 dev->features |= NETIF_F_RXCSUM;
1139 dev->features |= NETIF_F_GSO_SOFTWARE;
1141 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1142 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1144 /* MTU range: 68 - (something less than 65535) */
1145 dev->min_mtu = ETH_MIN_MTU;
1146 /* The max_mtu calculation does not take account of GENEVE
1147 * options, to avoid excluding potentially valid
1148 * configurations. This will be further reduced by IPvX hdr size.
1150 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1152 netif_keep_dst(dev);
1153 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1154 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1155 eth_hw_addr_random(dev);
1158 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1159 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1160 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1161 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1162 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1163 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1164 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1165 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1166 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1167 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1168 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1169 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1170 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1171 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1174 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1175 struct netlink_ext_ack *extack)
1177 if (tb[IFLA_ADDRESS]) {
1178 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1179 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1180 "Provided link layer address is not Ethernet");
1184 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1185 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1186 "Provided Ethernet address is not unicast");
1187 return -EADDRNOTAVAIL;
1192 NL_SET_ERR_MSG(extack,
1193 "Not enough attributes provided to perform the operation");
1197 if (data[IFLA_GENEVE_ID]) {
1198 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1200 if (vni >= GENEVE_N_VID) {
1201 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1202 "Geneve ID must be lower than 16777216");
1207 if (data[IFLA_GENEVE_DF]) {
1208 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1210 if (df < 0 || df > GENEVE_DF_MAX) {
1211 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
1212 "Invalid DF attribute");
1220 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1221 const struct ip_tunnel_info *info,
1222 bool *tun_on_same_port,
1223 bool *tun_collect_md)
1225 struct geneve_dev *geneve, *t = NULL;
1227 *tun_on_same_port = false;
1228 *tun_collect_md = false;
1229 list_for_each_entry(geneve, &gn->geneve_list, next) {
1230 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1231 *tun_collect_md = geneve->collect_md;
1232 *tun_on_same_port = true;
1234 if (info->key.tun_id == geneve->info.key.tun_id &&
1235 info->key.tp_dst == geneve->info.key.tp_dst &&
1236 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1242 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1244 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1245 info->key.ttl || info->key.label || info->key.tp_src ||
1246 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1249 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1250 struct ip_tunnel_info *b)
1252 if (ip_tunnel_info_af(a) == AF_INET)
1253 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1255 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1258 static int geneve_configure(struct net *net, struct net_device *dev,
1259 struct netlink_ext_ack *extack,
1260 const struct ip_tunnel_info *info,
1261 bool metadata, bool ipv6_rx_csum,
1262 bool ttl_inherit, enum ifla_geneve_df df)
1264 struct geneve_net *gn = net_generic(net, geneve_net_id);
1265 struct geneve_dev *t, *geneve = netdev_priv(dev);
1266 bool tun_collect_md, tun_on_same_port;
1269 if (metadata && !is_tnl_info_zero(info)) {
1270 NL_SET_ERR_MSG(extack,
1271 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1278 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1282 /* make enough headroom for basic scenario */
1283 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1284 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1285 encap_len += sizeof(struct iphdr);
1286 dev->max_mtu -= sizeof(struct iphdr);
1288 encap_len += sizeof(struct ipv6hdr);
1289 dev->max_mtu -= sizeof(struct ipv6hdr);
1291 dev->needed_headroom = encap_len + ETH_HLEN;
1294 if (tun_on_same_port) {
1295 NL_SET_ERR_MSG(extack,
1296 "There can be only one externally controlled device on a destination port");
1300 if (tun_collect_md) {
1301 NL_SET_ERR_MSG(extack,
1302 "There already exists an externally controlled device on this destination port");
1307 dst_cache_reset(&geneve->info.dst_cache);
1308 geneve->info = *info;
1309 geneve->collect_md = metadata;
1310 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1311 geneve->ttl_inherit = ttl_inherit;
1314 err = register_netdevice(dev);
1318 list_add(&geneve->next, &gn->geneve_list);
1322 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1324 memset(info, 0, sizeof(*info));
1325 info->key.tp_dst = htons(dst_port);
1328 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1329 struct netlink_ext_ack *extack,
1330 struct ip_tunnel_info *info, bool *metadata,
1331 bool *use_udp6_rx_checksums, bool *ttl_inherit,
1332 enum ifla_geneve_df *df, bool changelink)
1336 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1337 NL_SET_ERR_MSG(extack,
1338 "Cannot specify both IPv4 and IPv6 Remote addresses");
1342 if (data[IFLA_GENEVE_REMOTE]) {
1343 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1344 attrtype = IFLA_GENEVE_REMOTE;
1348 info->key.u.ipv4.dst =
1349 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1351 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1352 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1353 "Remote IPv4 address cannot be Multicast");
1358 if (data[IFLA_GENEVE_REMOTE6]) {
1359 #if IS_ENABLED(CONFIG_IPV6)
1360 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1361 attrtype = IFLA_GENEVE_REMOTE6;
1365 info->mode = IP_TUNNEL_INFO_IPV6;
1366 info->key.u.ipv6.dst =
1367 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1369 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1370 IPV6_ADDR_LINKLOCAL) {
1371 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1372 "Remote IPv6 address cannot be link-local");
1375 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1376 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1377 "Remote IPv6 address cannot be Multicast");
1380 info->key.tun_flags |= TUNNEL_CSUM;
1381 *use_udp6_rx_checksums = true;
1383 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1384 "IPv6 support not enabled in the kernel");
1385 return -EPFNOSUPPORT;
1389 if (data[IFLA_GENEVE_ID]) {
1394 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1395 tvni[0] = (vni & 0x00ff0000) >> 16;
1396 tvni[1] = (vni & 0x0000ff00) >> 8;
1397 tvni[2] = vni & 0x000000ff;
1399 tunid = vni_to_tunnel_id(tvni);
1400 if (changelink && (tunid != info->key.tun_id)) {
1401 attrtype = IFLA_GENEVE_ID;
1404 info->key.tun_id = tunid;
1407 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1408 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1409 *ttl_inherit = true;
1411 *ttl_inherit = false;
1412 } else if (data[IFLA_GENEVE_TTL]) {
1413 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1414 *ttl_inherit = false;
1417 if (data[IFLA_GENEVE_TOS])
1418 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1420 if (data[IFLA_GENEVE_DF])
1421 *df = nla_get_u8(data[IFLA_GENEVE_DF]);
1423 if (data[IFLA_GENEVE_LABEL]) {
1424 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1425 IPV6_FLOWLABEL_MASK;
1426 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1427 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1428 "Label attribute only applies for IPv6 Geneve devices");
1433 if (data[IFLA_GENEVE_PORT]) {
1435 attrtype = IFLA_GENEVE_PORT;
1438 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1441 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1443 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1449 if (data[IFLA_GENEVE_UDP_CSUM]) {
1451 attrtype = IFLA_GENEVE_UDP_CSUM;
1454 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1455 info->key.tun_flags |= TUNNEL_CSUM;
1458 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1459 #if IS_ENABLED(CONFIG_IPV6)
1461 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1464 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1465 info->key.tun_flags &= ~TUNNEL_CSUM;
1467 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1468 "IPv6 support not enabled in the kernel");
1469 return -EPFNOSUPPORT;
1473 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1474 #if IS_ENABLED(CONFIG_IPV6)
1476 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1479 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1480 *use_udp6_rx_checksums = false;
1482 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1483 "IPv6 support not enabled in the kernel");
1484 return -EPFNOSUPPORT;
1490 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1491 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1495 static void geneve_link_config(struct net_device *dev,
1496 struct ip_tunnel_info *info, struct nlattr *tb[])
1498 struct geneve_dev *geneve = netdev_priv(dev);
1502 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1506 switch (ip_tunnel_info_af(info)) {
1508 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1509 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1511 if (!IS_ERR(rt) && rt->dst.dev) {
1512 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1517 #if IS_ENABLED(CONFIG_IPV6)
1519 struct rt6_info *rt;
1521 if (!__in6_dev_get(dev))
1524 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1527 if (rt && rt->dst.dev)
1528 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1538 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1541 static int geneve_newlink(struct net *net, struct net_device *dev,
1542 struct nlattr *tb[], struct nlattr *data[],
1543 struct netlink_ext_ack *extack)
1545 enum ifla_geneve_df df = GENEVE_DF_UNSET;
1546 bool use_udp6_rx_checksums = false;
1547 struct ip_tunnel_info info;
1548 bool ttl_inherit = false;
1549 bool metadata = false;
1552 init_tnl_info(&info, GENEVE_UDP_PORT);
1553 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1554 &use_udp6_rx_checksums, &ttl_inherit, &df, false);
1558 err = geneve_configure(net, dev, extack, &info, metadata,
1559 use_udp6_rx_checksums, ttl_inherit, df);
1563 geneve_link_config(dev, &info, tb);
1568 /* Quiesces the geneve device data path for both TX and RX.
1570 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1571 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1572 * to complete for the existing set of in-flight packets to be transmitted,
1573 * then we would have quiesced the transmit data path. All the future packets
1574 * will get dropped until we unquiesce the data path.
1576 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1577 * if we set that to NULL under RCU and wait for synchronize_net() to
1578 * complete, then we would have quiesced the receive data path.
1580 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1581 struct geneve_sock **gs6)
1583 *gs4 = rtnl_dereference(geneve->sock4);
1584 rcu_assign_pointer(geneve->sock4, NULL);
1586 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1587 #if IS_ENABLED(CONFIG_IPV6)
1588 *gs6 = rtnl_dereference(geneve->sock6);
1589 rcu_assign_pointer(geneve->sock6, NULL);
1591 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1598 /* Resumes the geneve device data path for both TX and RX. */
1599 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1600 struct geneve_sock __maybe_unused *gs6)
1602 rcu_assign_pointer(geneve->sock4, gs4);
1604 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1605 #if IS_ENABLED(CONFIG_IPV6)
1606 rcu_assign_pointer(geneve->sock6, gs6);
1608 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1613 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1614 struct nlattr *data[],
1615 struct netlink_ext_ack *extack)
1617 struct geneve_dev *geneve = netdev_priv(dev);
1618 struct geneve_sock *gs4, *gs6;
1619 struct ip_tunnel_info info;
1621 bool use_udp6_rx_checksums;
1622 enum ifla_geneve_df df;
1626 /* If the geneve device is configured for metadata (or externally
1627 * controlled, for example, OVS), then nothing can be changed.
1629 if (geneve->collect_md)
1632 /* Start with the existing info. */
1633 memcpy(&info, &geneve->info, sizeof(info));
1634 metadata = geneve->collect_md;
1635 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1636 ttl_inherit = geneve->ttl_inherit;
1637 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1638 &use_udp6_rx_checksums, &ttl_inherit, &df, true);
1642 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1643 dst_cache_reset(&info.dst_cache);
1644 geneve_link_config(dev, &info, tb);
1647 geneve_quiesce(geneve, &gs4, &gs6);
1648 geneve->info = info;
1649 geneve->collect_md = metadata;
1650 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1651 geneve->ttl_inherit = ttl_inherit;
1652 geneve_unquiesce(geneve, gs4, gs6);
1657 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1659 struct geneve_dev *geneve = netdev_priv(dev);
1661 list_del(&geneve->next);
1662 unregister_netdevice_queue(dev, head);
1665 static size_t geneve_get_size(const struct net_device *dev)
1667 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1668 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1669 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1670 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1671 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1672 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1673 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1674 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1675 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1676 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1677 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1678 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1682 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1684 struct geneve_dev *geneve = netdev_priv(dev);
1685 struct ip_tunnel_info *info = &geneve->info;
1686 bool ttl_inherit = geneve->ttl_inherit;
1687 bool metadata = geneve->collect_md;
1691 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1692 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1693 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1694 goto nla_put_failure;
1696 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1697 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1698 info->key.u.ipv4.dst))
1699 goto nla_put_failure;
1700 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1701 !!(info->key.tun_flags & TUNNEL_CSUM)))
1702 goto nla_put_failure;
1704 #if IS_ENABLED(CONFIG_IPV6)
1705 } else if (!metadata) {
1706 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1707 &info->key.u.ipv6.dst))
1708 goto nla_put_failure;
1709 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1710 !(info->key.tun_flags & TUNNEL_CSUM)))
1711 goto nla_put_failure;
1715 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1716 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1717 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1718 goto nla_put_failure;
1720 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df))
1721 goto nla_put_failure;
1723 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1724 goto nla_put_failure;
1726 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1727 goto nla_put_failure;
1729 #if IS_ENABLED(CONFIG_IPV6)
1730 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1731 !geneve->use_udp6_rx_checksums))
1732 goto nla_put_failure;
1735 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1736 goto nla_put_failure;
1744 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1746 .maxtype = IFLA_GENEVE_MAX,
1747 .policy = geneve_policy,
1748 .priv_size = sizeof(struct geneve_dev),
1749 .setup = geneve_setup,
1750 .validate = geneve_validate,
1751 .newlink = geneve_newlink,
1752 .changelink = geneve_changelink,
1753 .dellink = geneve_dellink,
1754 .get_size = geneve_get_size,
1755 .fill_info = geneve_fill_info,
1758 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1759 u8 name_assign_type, u16 dst_port)
1761 struct nlattr *tb[IFLA_MAX + 1];
1762 struct ip_tunnel_info info;
1763 struct net_device *dev;
1764 LIST_HEAD(list_kill);
1767 memset(tb, 0, sizeof(tb));
1768 dev = rtnl_create_link(net, name, name_assign_type,
1769 &geneve_link_ops, tb, NULL);
1773 init_tnl_info(&info, dst_port);
1774 err = geneve_configure(net, dev, NULL, &info,
1775 true, true, false, GENEVE_DF_UNSET);
1778 return ERR_PTR(err);
1781 /* openvswitch users expect packet sizes to be unrestricted,
1782 * so set the largest MTU we can.
1784 err = geneve_change_mtu(dev, IP_MAX_MTU);
1788 err = rtnl_configure_link(dev, NULL);
1794 geneve_dellink(dev, &list_kill);
1795 unregister_netdevice_many(&list_kill);
1796 return ERR_PTR(err);
1798 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1800 static int geneve_netdevice_event(struct notifier_block *unused,
1801 unsigned long event, void *ptr)
1803 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1805 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1806 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1807 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1808 } else if (event == NETDEV_UNREGISTER) {
1809 geneve_offload_rx_ports(dev, false);
1810 } else if (event == NETDEV_REGISTER) {
1811 geneve_offload_rx_ports(dev, true);
1817 static struct notifier_block geneve_notifier_block __read_mostly = {
1818 .notifier_call = geneve_netdevice_event,
1821 static __net_init int geneve_init_net(struct net *net)
1823 struct geneve_net *gn = net_generic(net, geneve_net_id);
1825 INIT_LIST_HEAD(&gn->geneve_list);
1826 INIT_LIST_HEAD(&gn->sock_list);
1830 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1832 struct geneve_net *gn = net_generic(net, geneve_net_id);
1833 struct geneve_dev *geneve, *next;
1834 struct net_device *dev, *aux;
1836 /* gather any geneve devices that were moved into this ns */
1837 for_each_netdev_safe(net, dev, aux)
1838 if (dev->rtnl_link_ops == &geneve_link_ops)
1839 unregister_netdevice_queue(dev, head);
1841 /* now gather any other geneve devices that were created in this ns */
1842 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1843 /* If geneve->dev is in the same netns, it was already added
1844 * to the list by the previous loop.
1846 if (!net_eq(dev_net(geneve->dev), net))
1847 unregister_netdevice_queue(geneve->dev, head);
1850 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1853 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1859 list_for_each_entry(net, net_list, exit_list)
1860 geneve_destroy_tunnels(net, &list);
1862 /* unregister the devices gathered above */
1863 unregister_netdevice_many(&list);
1867 static struct pernet_operations geneve_net_ops = {
1868 .init = geneve_init_net,
1869 .exit_batch = geneve_exit_batch_net,
1870 .id = &geneve_net_id,
1871 .size = sizeof(struct geneve_net),
1874 static int __init geneve_init_module(void)
1878 rc = register_pernet_subsys(&geneve_net_ops);
1882 rc = register_netdevice_notifier(&geneve_notifier_block);
1886 rc = rtnl_link_register(&geneve_link_ops);
1892 unregister_netdevice_notifier(&geneve_notifier_block);
1894 unregister_pernet_subsys(&geneve_net_ops);
1898 late_initcall(geneve_init_module);
1900 static void __exit geneve_cleanup_module(void)
1902 rtnl_link_unregister(&geneve_link_ops);
1903 unregister_netdevice_notifier(&geneve_notifier_block);
1904 unregister_pernet_subsys(&geneve_net_ops);
1906 module_exit(geneve_cleanup_module);
1908 MODULE_LICENSE("GPL");
1909 MODULE_VERSION(GENEVE_NETDEV_VER);
1910 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1911 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1912 MODULE_ALIAS_RTNL_LINK("geneve");