Loading...
1/*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
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.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
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>
22
23#define GENEVE_NETDEV_VER "0.6"
24
25#define GENEVE_UDP_PORT 6081
26
27#define GENEVE_N_VID (1u << 24)
28#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
29
30#define VNI_HASH_BITS 10
31#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
32
33static bool log_ecn_error = true;
34module_param(log_ecn_error, bool, 0644);
35MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
36
37#define GENEVE_VER 0
38#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
39
40/* per-network namespace private data for this module */
41struct geneve_net {
42 struct list_head geneve_list;
43 struct list_head sock_list;
44};
45
46static unsigned int geneve_net_id;
47
48struct geneve_dev_node {
49 struct hlist_node hlist;
50 struct geneve_dev *geneve;
51};
52
53/* Pseudo network device */
54struct geneve_dev {
55 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
56#if IS_ENABLED(CONFIG_IPV6)
57 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
58#endif
59 struct net *net; /* netns for packet i/o */
60 struct net_device *dev; /* netdev for geneve tunnel */
61 struct ip_tunnel_info info;
62 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
63#if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
65#endif
66 struct list_head next; /* geneve's per namespace list */
67 struct gro_cells gro_cells;
68 bool collect_md;
69 bool use_udp6_rx_checksums;
70};
71
72struct geneve_sock {
73 bool collect_md;
74 struct list_head list;
75 struct socket *sock;
76 struct rcu_head rcu;
77 int refcnt;
78 struct hlist_head vni_list[VNI_HASH_SIZE];
79};
80
81static inline __u32 geneve_net_vni_hash(u8 vni[3])
82{
83 __u32 vnid;
84
85 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
86 return hash_32(vnid, VNI_HASH_BITS);
87}
88
89static __be64 vni_to_tunnel_id(const __u8 *vni)
90{
91#ifdef __BIG_ENDIAN
92 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
93#else
94 return (__force __be64)(((__force u64)vni[0] << 40) |
95 ((__force u64)vni[1] << 48) |
96 ((__force u64)vni[2] << 56));
97#endif
98}
99
100/* Convert 64 bit tunnel ID to 24 bit VNI. */
101static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
102{
103#ifdef __BIG_ENDIAN
104 vni[0] = (__force __u8)(tun_id >> 16);
105 vni[1] = (__force __u8)(tun_id >> 8);
106 vni[2] = (__force __u8)tun_id;
107#else
108 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
109 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
110 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
111#endif
112}
113
114static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
115{
116 return !memcmp(vni, &tun_id[5], 3);
117}
118
119static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
120{
121 return gs->sock->sk->sk_family;
122}
123
124static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
125 __be32 addr, u8 vni[])
126{
127 struct hlist_head *vni_list_head;
128 struct geneve_dev_node *node;
129 __u32 hash;
130
131 /* Find the device for this VNI */
132 hash = geneve_net_vni_hash(vni);
133 vni_list_head = &gs->vni_list[hash];
134 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
135 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
136 addr == node->geneve->info.key.u.ipv4.dst)
137 return node->geneve;
138 }
139 return NULL;
140}
141
142#if IS_ENABLED(CONFIG_IPV6)
143static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
144 struct in6_addr addr6, u8 vni[])
145{
146 struct hlist_head *vni_list_head;
147 struct geneve_dev_node *node;
148 __u32 hash;
149
150 /* Find the device for this VNI */
151 hash = geneve_net_vni_hash(vni);
152 vni_list_head = &gs->vni_list[hash];
153 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
154 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
155 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
156 return node->geneve;
157 }
158 return NULL;
159}
160#endif
161
162static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
163{
164 return (struct genevehdr *)(udp_hdr(skb) + 1);
165}
166
167static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
168 struct sk_buff *skb)
169{
170 static u8 zero_vni[3];
171 u8 *vni;
172
173 if (geneve_get_sk_family(gs) == AF_INET) {
174 struct iphdr *iph;
175 __be32 addr;
176
177 iph = ip_hdr(skb); /* outer IP header... */
178
179 if (gs->collect_md) {
180 vni = zero_vni;
181 addr = 0;
182 } else {
183 vni = geneve_hdr(skb)->vni;
184 addr = iph->saddr;
185 }
186
187 return geneve_lookup(gs, addr, vni);
188#if IS_ENABLED(CONFIG_IPV6)
189 } else if (geneve_get_sk_family(gs) == AF_INET6) {
190 static struct in6_addr zero_addr6;
191 struct ipv6hdr *ip6h;
192 struct in6_addr addr6;
193
194 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
195
196 if (gs->collect_md) {
197 vni = zero_vni;
198 addr6 = zero_addr6;
199 } else {
200 vni = geneve_hdr(skb)->vni;
201 addr6 = ip6h->saddr;
202 }
203
204 return geneve6_lookup(gs, addr6, vni);
205#endif
206 }
207 return NULL;
208}
209
210/* geneve receive/decap routine */
211static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
212 struct sk_buff *skb)
213{
214 struct genevehdr *gnvh = geneve_hdr(skb);
215 struct metadata_dst *tun_dst = NULL;
216 struct pcpu_sw_netstats *stats;
217 unsigned int len;
218 int err = 0;
219 void *oiph;
220
221 if (ip_tunnel_collect_metadata() || gs->collect_md) {
222 __be16 flags;
223
224 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
225 (gnvh->oam ? TUNNEL_OAM : 0) |
226 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
227
228 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
229 vni_to_tunnel_id(gnvh->vni),
230 gnvh->opt_len * 4);
231 if (!tun_dst) {
232 geneve->dev->stats.rx_dropped++;
233 goto drop;
234 }
235 /* Update tunnel dst according to Geneve options. */
236 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
237 gnvh->options, gnvh->opt_len * 4);
238 } else {
239 /* Drop packets w/ critical options,
240 * since we don't support any...
241 */
242 if (gnvh->critical) {
243 geneve->dev->stats.rx_frame_errors++;
244 geneve->dev->stats.rx_errors++;
245 goto drop;
246 }
247 }
248
249 skb_reset_mac_header(skb);
250 skb->protocol = eth_type_trans(skb, geneve->dev);
251 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
252
253 if (tun_dst)
254 skb_dst_set(skb, &tun_dst->dst);
255
256 /* Ignore packet loops (and multicast echo) */
257 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
258 geneve->dev->stats.rx_errors++;
259 goto drop;
260 }
261
262 oiph = skb_network_header(skb);
263 skb_reset_network_header(skb);
264
265 if (geneve_get_sk_family(gs) == AF_INET)
266 err = IP_ECN_decapsulate(oiph, skb);
267#if IS_ENABLED(CONFIG_IPV6)
268 else
269 err = IP6_ECN_decapsulate(oiph, skb);
270#endif
271
272 if (unlikely(err)) {
273 if (log_ecn_error) {
274 if (geneve_get_sk_family(gs) == AF_INET)
275 net_info_ratelimited("non-ECT from %pI4 "
276 "with TOS=%#x\n",
277 &((struct iphdr *)oiph)->saddr,
278 ((struct iphdr *)oiph)->tos);
279#if IS_ENABLED(CONFIG_IPV6)
280 else
281 net_info_ratelimited("non-ECT from %pI6\n",
282 &((struct ipv6hdr *)oiph)->saddr);
283#endif
284 }
285 if (err > 1) {
286 ++geneve->dev->stats.rx_frame_errors;
287 ++geneve->dev->stats.rx_errors;
288 goto drop;
289 }
290 }
291
292 len = skb->len;
293 err = gro_cells_receive(&geneve->gro_cells, skb);
294 if (likely(err == NET_RX_SUCCESS)) {
295 stats = this_cpu_ptr(geneve->dev->tstats);
296 u64_stats_update_begin(&stats->syncp);
297 stats->rx_packets++;
298 stats->rx_bytes += len;
299 u64_stats_update_end(&stats->syncp);
300 }
301 return;
302drop:
303 /* Consume bad packet */
304 kfree_skb(skb);
305}
306
307/* Setup stats when device is created */
308static int geneve_init(struct net_device *dev)
309{
310 struct geneve_dev *geneve = netdev_priv(dev);
311 int err;
312
313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
314 if (!dev->tstats)
315 return -ENOMEM;
316
317 err = gro_cells_init(&geneve->gro_cells, dev);
318 if (err) {
319 free_percpu(dev->tstats);
320 return err;
321 }
322
323 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
324 if (err) {
325 free_percpu(dev->tstats);
326 gro_cells_destroy(&geneve->gro_cells);
327 return err;
328 }
329 return 0;
330}
331
332static void geneve_uninit(struct net_device *dev)
333{
334 struct geneve_dev *geneve = netdev_priv(dev);
335
336 dst_cache_destroy(&geneve->info.dst_cache);
337 gro_cells_destroy(&geneve->gro_cells);
338 free_percpu(dev->tstats);
339}
340
341/* Callback from net/ipv4/udp.c to receive packets */
342static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
343{
344 struct genevehdr *geneveh;
345 struct geneve_dev *geneve;
346 struct geneve_sock *gs;
347 int opts_len;
348
349 /* Need UDP and Geneve header to be present */
350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
351 goto drop;
352
353 /* Return packets with reserved bits set */
354 geneveh = geneve_hdr(skb);
355 if (unlikely(geneveh->ver != GENEVE_VER))
356 goto drop;
357
358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
359 goto drop;
360
361 gs = rcu_dereference_sk_user_data(sk);
362 if (!gs)
363 goto drop;
364
365 geneve = geneve_lookup_skb(gs, skb);
366 if (!geneve)
367 goto drop;
368
369 opts_len = geneveh->opt_len * 4;
370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
371 htons(ETH_P_TEB),
372 !net_eq(geneve->net, dev_net(geneve->dev)))) {
373 geneve->dev->stats.rx_dropped++;
374 goto drop;
375 }
376
377 geneve_rx(geneve, gs, skb);
378 return 0;
379
380drop:
381 /* Consume bad packet */
382 kfree_skb(skb);
383 return 0;
384}
385
386static struct socket *geneve_create_sock(struct net *net, bool ipv6,
387 __be16 port, bool ipv6_rx_csum)
388{
389 struct socket *sock;
390 struct udp_port_cfg udp_conf;
391 int err;
392
393 memset(&udp_conf, 0, sizeof(udp_conf));
394
395 if (ipv6) {
396 udp_conf.family = AF_INET6;
397 udp_conf.ipv6_v6only = 1;
398 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
399 } else {
400 udp_conf.family = AF_INET;
401 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
402 }
403
404 udp_conf.local_udp_port = port;
405
406 /* Open UDP socket */
407 err = udp_sock_create(net, &udp_conf, &sock);
408 if (err < 0)
409 return ERR_PTR(err);
410
411 return sock;
412}
413
414static int geneve_hlen(struct genevehdr *gh)
415{
416 return sizeof(*gh) + gh->opt_len * 4;
417}
418
419static struct sk_buff **geneve_gro_receive(struct sock *sk,
420 struct sk_buff **head,
421 struct sk_buff *skb)
422{
423 struct sk_buff *p, **pp = NULL;
424 struct genevehdr *gh, *gh2;
425 unsigned int hlen, gh_len, off_gnv;
426 const struct packet_offload *ptype;
427 __be16 type;
428 int flush = 1;
429
430 off_gnv = skb_gro_offset(skb);
431 hlen = off_gnv + sizeof(*gh);
432 gh = skb_gro_header_fast(skb, off_gnv);
433 if (skb_gro_header_hard(skb, hlen)) {
434 gh = skb_gro_header_slow(skb, hlen, off_gnv);
435 if (unlikely(!gh))
436 goto out;
437 }
438
439 if (gh->ver != GENEVE_VER || gh->oam)
440 goto out;
441 gh_len = geneve_hlen(gh);
442
443 hlen = off_gnv + gh_len;
444 if (skb_gro_header_hard(skb, hlen)) {
445 gh = skb_gro_header_slow(skb, hlen, off_gnv);
446 if (unlikely(!gh))
447 goto out;
448 }
449
450 for (p = *head; p; p = p->next) {
451 if (!NAPI_GRO_CB(p)->same_flow)
452 continue;
453
454 gh2 = (struct genevehdr *)(p->data + off_gnv);
455 if (gh->opt_len != gh2->opt_len ||
456 memcmp(gh, gh2, gh_len)) {
457 NAPI_GRO_CB(p)->same_flow = 0;
458 continue;
459 }
460 }
461
462 type = gh->proto_type;
463
464 rcu_read_lock();
465 ptype = gro_find_receive_by_type(type);
466 if (!ptype)
467 goto out_unlock;
468
469 skb_gro_pull(skb, gh_len);
470 skb_gro_postpull_rcsum(skb, gh, gh_len);
471 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
472 flush = 0;
473
474out_unlock:
475 rcu_read_unlock();
476out:
477 NAPI_GRO_CB(skb)->flush |= flush;
478
479 return pp;
480}
481
482static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
483 int nhoff)
484{
485 struct genevehdr *gh;
486 struct packet_offload *ptype;
487 __be16 type;
488 int gh_len;
489 int err = -ENOSYS;
490
491 gh = (struct genevehdr *)(skb->data + nhoff);
492 gh_len = geneve_hlen(gh);
493 type = gh->proto_type;
494
495 rcu_read_lock();
496 ptype = gro_find_complete_by_type(type);
497 if (ptype)
498 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
499
500 rcu_read_unlock();
501
502 skb_set_inner_mac_header(skb, nhoff + gh_len);
503
504 return err;
505}
506
507/* Create new listen socket if needed */
508static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
509 bool ipv6, bool ipv6_rx_csum)
510{
511 struct geneve_net *gn = net_generic(net, geneve_net_id);
512 struct geneve_sock *gs;
513 struct socket *sock;
514 struct udp_tunnel_sock_cfg tunnel_cfg;
515 int h;
516
517 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
518 if (!gs)
519 return ERR_PTR(-ENOMEM);
520
521 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
522 if (IS_ERR(sock)) {
523 kfree(gs);
524 return ERR_CAST(sock);
525 }
526
527 gs->sock = sock;
528 gs->refcnt = 1;
529 for (h = 0; h < VNI_HASH_SIZE; ++h)
530 INIT_HLIST_HEAD(&gs->vni_list[h]);
531
532 /* Initialize the geneve udp offloads structure */
533 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
534
535 /* Mark socket as an encapsulation socket */
536 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
537 tunnel_cfg.sk_user_data = gs;
538 tunnel_cfg.encap_type = 1;
539 tunnel_cfg.gro_receive = geneve_gro_receive;
540 tunnel_cfg.gro_complete = geneve_gro_complete;
541 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
542 tunnel_cfg.encap_destroy = NULL;
543 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
544 list_add(&gs->list, &gn->sock_list);
545 return gs;
546}
547
548static void __geneve_sock_release(struct geneve_sock *gs)
549{
550 if (!gs || --gs->refcnt)
551 return;
552
553 list_del(&gs->list);
554 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
555 udp_tunnel_sock_release(gs->sock);
556 kfree_rcu(gs, rcu);
557}
558
559static void geneve_sock_release(struct geneve_dev *geneve)
560{
561 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
562#if IS_ENABLED(CONFIG_IPV6)
563 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
564
565 rcu_assign_pointer(geneve->sock6, NULL);
566#endif
567
568 rcu_assign_pointer(geneve->sock4, NULL);
569 synchronize_net();
570
571 __geneve_sock_release(gs4);
572#if IS_ENABLED(CONFIG_IPV6)
573 __geneve_sock_release(gs6);
574#endif
575}
576
577static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
578 sa_family_t family,
579 __be16 dst_port)
580{
581 struct geneve_sock *gs;
582
583 list_for_each_entry(gs, &gn->sock_list, list) {
584 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
585 geneve_get_sk_family(gs) == family) {
586 return gs;
587 }
588 }
589 return NULL;
590}
591
592static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
593{
594 struct net *net = geneve->net;
595 struct geneve_net *gn = net_generic(net, geneve_net_id);
596 struct geneve_dev_node *node;
597 struct geneve_sock *gs;
598 __u8 vni[3];
599 __u32 hash;
600
601 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
602 if (gs) {
603 gs->refcnt++;
604 goto out;
605 }
606
607 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
608 geneve->use_udp6_rx_checksums);
609 if (IS_ERR(gs))
610 return PTR_ERR(gs);
611
612out:
613 gs->collect_md = geneve->collect_md;
614#if IS_ENABLED(CONFIG_IPV6)
615 if (ipv6) {
616 rcu_assign_pointer(geneve->sock6, gs);
617 node = &geneve->hlist6;
618 } else
619#endif
620 {
621 rcu_assign_pointer(geneve->sock4, gs);
622 node = &geneve->hlist4;
623 }
624 node->geneve = geneve;
625
626 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
627 hash = geneve_net_vni_hash(vni);
628 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
629 return 0;
630}
631
632static int geneve_open(struct net_device *dev)
633{
634 struct geneve_dev *geneve = netdev_priv(dev);
635 bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
636 bool metadata = geneve->collect_md;
637 int ret = 0;
638
639#if IS_ENABLED(CONFIG_IPV6)
640 if (ipv6 || metadata)
641 ret = geneve_sock_add(geneve, true);
642#endif
643 if (!ret && (!ipv6 || metadata))
644 ret = geneve_sock_add(geneve, false);
645 if (ret < 0)
646 geneve_sock_release(geneve);
647
648 return ret;
649}
650
651static int geneve_stop(struct net_device *dev)
652{
653 struct geneve_dev *geneve = netdev_priv(dev);
654
655 hlist_del_init_rcu(&geneve->hlist4.hlist);
656#if IS_ENABLED(CONFIG_IPV6)
657 hlist_del_init_rcu(&geneve->hlist6.hlist);
658#endif
659 geneve_sock_release(geneve);
660 return 0;
661}
662
663static void geneve_build_header(struct genevehdr *geneveh,
664 const struct ip_tunnel_info *info)
665{
666 geneveh->ver = GENEVE_VER;
667 geneveh->opt_len = info->options_len / 4;
668 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
669 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
670 geneveh->rsvd1 = 0;
671 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
672 geneveh->proto_type = htons(ETH_P_TEB);
673 geneveh->rsvd2 = 0;
674
675 ip_tunnel_info_opts_get(geneveh->options, info);
676}
677
678static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
679 const struct ip_tunnel_info *info,
680 bool xnet, int ip_hdr_len)
681{
682 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
683 struct genevehdr *gnvh;
684 int min_headroom;
685 int err;
686
687 skb_reset_mac_header(skb);
688 skb_scrub_packet(skb, xnet);
689
690 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
691 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
692 err = skb_cow_head(skb, min_headroom);
693 if (unlikely(err))
694 goto free_dst;
695
696 err = udp_tunnel_handle_offloads(skb, udp_sum);
697 if (err)
698 goto free_dst;
699
700 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
701 geneve_build_header(gnvh, info);
702 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
703 return 0;
704
705free_dst:
706 dst_release(dst);
707 return err;
708}
709
710static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
711 struct net_device *dev,
712 struct geneve_sock *gs4,
713 struct flowi4 *fl4,
714 const struct ip_tunnel_info *info)
715{
716 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
717 struct geneve_dev *geneve = netdev_priv(dev);
718 struct dst_cache *dst_cache;
719 struct rtable *rt = NULL;
720 __u8 tos;
721
722 if (!gs4)
723 return ERR_PTR(-EIO);
724
725 memset(fl4, 0, sizeof(*fl4));
726 fl4->flowi4_mark = skb->mark;
727 fl4->flowi4_proto = IPPROTO_UDP;
728 fl4->daddr = info->key.u.ipv4.dst;
729 fl4->saddr = info->key.u.ipv4.src;
730
731 tos = info->key.tos;
732 if ((tos == 1) && !geneve->collect_md) {
733 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
734 use_cache = false;
735 }
736 fl4->flowi4_tos = RT_TOS(tos);
737
738 dst_cache = (struct dst_cache *)&info->dst_cache;
739 if (use_cache) {
740 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
741 if (rt)
742 return rt;
743 }
744 rt = ip_route_output_key(geneve->net, fl4);
745 if (IS_ERR(rt)) {
746 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
747 return ERR_PTR(-ENETUNREACH);
748 }
749 if (rt->dst.dev == dev) { /* is this necessary? */
750 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
751 ip_rt_put(rt);
752 return ERR_PTR(-ELOOP);
753 }
754 if (use_cache)
755 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
756 return rt;
757}
758
759#if IS_ENABLED(CONFIG_IPV6)
760static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
761 struct net_device *dev,
762 struct geneve_sock *gs6,
763 struct flowi6 *fl6,
764 const struct ip_tunnel_info *info)
765{
766 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
767 struct geneve_dev *geneve = netdev_priv(dev);
768 struct dst_entry *dst = NULL;
769 struct dst_cache *dst_cache;
770 __u8 prio;
771
772 if (!gs6)
773 return ERR_PTR(-EIO);
774
775 memset(fl6, 0, sizeof(*fl6));
776 fl6->flowi6_mark = skb->mark;
777 fl6->flowi6_proto = IPPROTO_UDP;
778 fl6->daddr = info->key.u.ipv6.dst;
779 fl6->saddr = info->key.u.ipv6.src;
780 prio = info->key.tos;
781 if ((prio == 1) && !geneve->collect_md) {
782 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
783 use_cache = false;
784 }
785
786 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
787 info->key.label);
788 dst_cache = (struct dst_cache *)&info->dst_cache;
789 if (use_cache) {
790 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
791 if (dst)
792 return dst;
793 }
794 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
795 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
796 return ERR_PTR(-ENETUNREACH);
797 }
798 if (dst->dev == dev) { /* is this necessary? */
799 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
800 dst_release(dst);
801 return ERR_PTR(-ELOOP);
802 }
803
804 if (use_cache)
805 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
806 return dst;
807}
808#endif
809
810static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
811 struct geneve_dev *geneve,
812 const struct ip_tunnel_info *info)
813{
814 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
815 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
816 const struct ip_tunnel_key *key = &info->key;
817 struct rtable *rt;
818 struct flowi4 fl4;
819 __u8 tos, ttl;
820 __be16 sport;
821 __be16 df;
822 int err;
823
824 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
825 if (IS_ERR(rt))
826 return PTR_ERR(rt);
827
828 if (skb_dst(skb)) {
829 int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) -
830 GENEVE_BASE_HLEN - info->options_len - 14;
831
832 skb_dst_update_pmtu(skb, mtu);
833 }
834
835 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
836 if (geneve->collect_md) {
837 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
838 ttl = key->ttl;
839 } else {
840 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
841 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
842 }
843 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
844
845 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
846 if (unlikely(err))
847 return err;
848
849 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
850 tos, ttl, df, sport, geneve->info.key.tp_dst,
851 !net_eq(geneve->net, dev_net(geneve->dev)),
852 !(info->key.tun_flags & TUNNEL_CSUM));
853 return 0;
854}
855
856#if IS_ENABLED(CONFIG_IPV6)
857static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
858 struct geneve_dev *geneve,
859 const struct ip_tunnel_info *info)
860{
861 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
862 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
863 const struct ip_tunnel_key *key = &info->key;
864 struct dst_entry *dst = NULL;
865 struct flowi6 fl6;
866 __u8 prio, ttl;
867 __be16 sport;
868 int err;
869
870 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
871 if (IS_ERR(dst))
872 return PTR_ERR(dst);
873
874 if (skb_dst(skb)) {
875 int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) -
876 GENEVE_BASE_HLEN - info->options_len - 14;
877
878 skb_dst_update_pmtu(skb, mtu);
879 }
880
881 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
882 if (geneve->collect_md) {
883 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
884 ttl = key->ttl;
885 } else {
886 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
887 ip_hdr(skb), skb);
888 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
889 }
890 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
891 if (unlikely(err))
892 return err;
893
894 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
895 &fl6.saddr, &fl6.daddr, prio, ttl,
896 info->key.label, sport, geneve->info.key.tp_dst,
897 !(info->key.tun_flags & TUNNEL_CSUM));
898 return 0;
899}
900#endif
901
902static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
903{
904 struct geneve_dev *geneve = netdev_priv(dev);
905 struct ip_tunnel_info *info = NULL;
906 int err;
907
908 if (geneve->collect_md) {
909 info = skb_tunnel_info(skb);
910 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
911 err = -EINVAL;
912 netdev_dbg(dev, "no tunnel metadata\n");
913 goto tx_error;
914 }
915 } else {
916 info = &geneve->info;
917 }
918
919 rcu_read_lock();
920#if IS_ENABLED(CONFIG_IPV6)
921 if (info->mode & IP_TUNNEL_INFO_IPV6)
922 err = geneve6_xmit_skb(skb, dev, geneve, info);
923 else
924#endif
925 err = geneve_xmit_skb(skb, dev, geneve, info);
926 rcu_read_unlock();
927
928 if (likely(!err))
929 return NETDEV_TX_OK;
930tx_error:
931 dev_kfree_skb(skb);
932
933 if (err == -ELOOP)
934 dev->stats.collisions++;
935 else if (err == -ENETUNREACH)
936 dev->stats.tx_carrier_errors++;
937
938 dev->stats.tx_errors++;
939 return NETDEV_TX_OK;
940}
941
942static int geneve_change_mtu(struct net_device *dev, int new_mtu)
943{
944 /* Only possible if called internally, ndo_change_mtu path's new_mtu
945 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
946 */
947 if (new_mtu > dev->max_mtu)
948 new_mtu = dev->max_mtu;
949
950 dev->mtu = new_mtu;
951 return 0;
952}
953
954static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
955{
956 struct ip_tunnel_info *info = skb_tunnel_info(skb);
957 struct geneve_dev *geneve = netdev_priv(dev);
958
959 if (ip_tunnel_info_af(info) == AF_INET) {
960 struct rtable *rt;
961 struct flowi4 fl4;
962 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
963
964 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
965 if (IS_ERR(rt))
966 return PTR_ERR(rt);
967
968 ip_rt_put(rt);
969 info->key.u.ipv4.src = fl4.saddr;
970#if IS_ENABLED(CONFIG_IPV6)
971 } else if (ip_tunnel_info_af(info) == AF_INET6) {
972 struct dst_entry *dst;
973 struct flowi6 fl6;
974 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
975
976 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
977 if (IS_ERR(dst))
978 return PTR_ERR(dst);
979
980 dst_release(dst);
981 info->key.u.ipv6.src = fl6.saddr;
982#endif
983 } else {
984 return -EINVAL;
985 }
986
987 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
988 1, USHRT_MAX, true);
989 info->key.tp_dst = geneve->info.key.tp_dst;
990 return 0;
991}
992
993static const struct net_device_ops geneve_netdev_ops = {
994 .ndo_init = geneve_init,
995 .ndo_uninit = geneve_uninit,
996 .ndo_open = geneve_open,
997 .ndo_stop = geneve_stop,
998 .ndo_start_xmit = geneve_xmit,
999 .ndo_get_stats64 = ip_tunnel_get_stats64,
1000 .ndo_change_mtu = geneve_change_mtu,
1001 .ndo_validate_addr = eth_validate_addr,
1002 .ndo_set_mac_address = eth_mac_addr,
1003 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1004};
1005
1006static void geneve_get_drvinfo(struct net_device *dev,
1007 struct ethtool_drvinfo *drvinfo)
1008{
1009 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1010 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1011}
1012
1013static const struct ethtool_ops geneve_ethtool_ops = {
1014 .get_drvinfo = geneve_get_drvinfo,
1015 .get_link = ethtool_op_get_link,
1016};
1017
1018/* Info for udev, that this is a virtual tunnel endpoint */
1019static struct device_type geneve_type = {
1020 .name = "geneve",
1021};
1022
1023/* Calls the ndo_udp_tunnel_add of the caller in order to
1024 * supply the listening GENEVE udp ports. Callers are expected
1025 * to implement the ndo_udp_tunnel_add.
1026 */
1027static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1028{
1029 struct net *net = dev_net(dev);
1030 struct geneve_net *gn = net_generic(net, geneve_net_id);
1031 struct geneve_sock *gs;
1032
1033 rcu_read_lock();
1034 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1035 if (push) {
1036 udp_tunnel_push_rx_port(dev, gs->sock,
1037 UDP_TUNNEL_TYPE_GENEVE);
1038 } else {
1039 udp_tunnel_drop_rx_port(dev, gs->sock,
1040 UDP_TUNNEL_TYPE_GENEVE);
1041 }
1042 }
1043 rcu_read_unlock();
1044}
1045
1046/* Initialize the device structure. */
1047static void geneve_setup(struct net_device *dev)
1048{
1049 ether_setup(dev);
1050
1051 dev->netdev_ops = &geneve_netdev_ops;
1052 dev->ethtool_ops = &geneve_ethtool_ops;
1053 dev->needs_free_netdev = true;
1054
1055 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1056
1057 dev->features |= NETIF_F_LLTX;
1058 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1059 dev->features |= NETIF_F_RXCSUM;
1060 dev->features |= NETIF_F_GSO_SOFTWARE;
1061
1062 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1063 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1064
1065 /* MTU range: 68 - (something less than 65535) */
1066 dev->min_mtu = ETH_MIN_MTU;
1067 /* The max_mtu calculation does not take account of GENEVE
1068 * options, to avoid excluding potentially valid
1069 * configurations. This will be further reduced by IPvX hdr size.
1070 */
1071 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1072
1073 netif_keep_dst(dev);
1074 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1075 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1076 eth_hw_addr_random(dev);
1077}
1078
1079static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1080 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1081 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1082 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1083 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1084 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1085 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1086 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1087 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1088 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1089 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1090 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1091};
1092
1093static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1094 struct netlink_ext_ack *extack)
1095{
1096 if (tb[IFLA_ADDRESS]) {
1097 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1098 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1099 "Provided link layer address is not Ethernet");
1100 return -EINVAL;
1101 }
1102
1103 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1104 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1105 "Provided Ethernet address is not unicast");
1106 return -EADDRNOTAVAIL;
1107 }
1108 }
1109
1110 if (!data) {
1111 NL_SET_ERR_MSG(extack,
1112 "Not enough attributes provided to perform the operation");
1113 return -EINVAL;
1114 }
1115
1116 if (data[IFLA_GENEVE_ID]) {
1117 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1118
1119 if (vni >= GENEVE_N_VID) {
1120 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1121 "Geneve ID must be lower than 16777216");
1122 return -ERANGE;
1123 }
1124 }
1125
1126 return 0;
1127}
1128
1129static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1130 const struct ip_tunnel_info *info,
1131 bool *tun_on_same_port,
1132 bool *tun_collect_md)
1133{
1134 struct geneve_dev *geneve, *t = NULL;
1135
1136 *tun_on_same_port = false;
1137 *tun_collect_md = false;
1138 list_for_each_entry(geneve, &gn->geneve_list, next) {
1139 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1140 *tun_collect_md = geneve->collect_md;
1141 *tun_on_same_port = true;
1142 }
1143 if (info->key.tun_id == geneve->info.key.tun_id &&
1144 info->key.tp_dst == geneve->info.key.tp_dst &&
1145 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1146 t = geneve;
1147 }
1148 return t;
1149}
1150
1151static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1152{
1153 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1154 info->key.ttl || info->key.label || info->key.tp_src ||
1155 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1156}
1157
1158static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1159 struct ip_tunnel_info *b)
1160{
1161 if (ip_tunnel_info_af(a) == AF_INET)
1162 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1163 else
1164 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1165}
1166
1167static int geneve_configure(struct net *net, struct net_device *dev,
1168 struct netlink_ext_ack *extack,
1169 const struct ip_tunnel_info *info,
1170 bool metadata, bool ipv6_rx_csum)
1171{
1172 struct geneve_net *gn = net_generic(net, geneve_net_id);
1173 struct geneve_dev *t, *geneve = netdev_priv(dev);
1174 bool tun_collect_md, tun_on_same_port;
1175 int err, encap_len;
1176
1177 if (metadata && !is_tnl_info_zero(info)) {
1178 NL_SET_ERR_MSG(extack,
1179 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1180 return -EINVAL;
1181 }
1182
1183 geneve->net = net;
1184 geneve->dev = dev;
1185
1186 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1187 if (t)
1188 return -EBUSY;
1189
1190 /* make enough headroom for basic scenario */
1191 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1192 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1193 encap_len += sizeof(struct iphdr);
1194 dev->max_mtu -= sizeof(struct iphdr);
1195 } else {
1196 encap_len += sizeof(struct ipv6hdr);
1197 dev->max_mtu -= sizeof(struct ipv6hdr);
1198 }
1199 dev->needed_headroom = encap_len + ETH_HLEN;
1200
1201 if (metadata) {
1202 if (tun_on_same_port) {
1203 NL_SET_ERR_MSG(extack,
1204 "There can be only one externally controlled device on a destination port");
1205 return -EPERM;
1206 }
1207 } else {
1208 if (tun_collect_md) {
1209 NL_SET_ERR_MSG(extack,
1210 "There already exists an externally controlled device on this destination port");
1211 return -EPERM;
1212 }
1213 }
1214
1215 dst_cache_reset(&geneve->info.dst_cache);
1216 geneve->info = *info;
1217 geneve->collect_md = metadata;
1218 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1219
1220 err = register_netdevice(dev);
1221 if (err)
1222 return err;
1223
1224 list_add(&geneve->next, &gn->geneve_list);
1225 return 0;
1226}
1227
1228static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1229{
1230 memset(info, 0, sizeof(*info));
1231 info->key.tp_dst = htons(dst_port);
1232}
1233
1234static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1235 struct netlink_ext_ack *extack,
1236 struct ip_tunnel_info *info, bool *metadata,
1237 bool *use_udp6_rx_checksums, bool changelink)
1238{
1239 int attrtype;
1240
1241 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1242 NL_SET_ERR_MSG(extack,
1243 "Cannot specify both IPv4 and IPv6 Remote addresses");
1244 return -EINVAL;
1245 }
1246
1247 if (data[IFLA_GENEVE_REMOTE]) {
1248 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1249 attrtype = IFLA_GENEVE_REMOTE;
1250 goto change_notsup;
1251 }
1252
1253 info->key.u.ipv4.dst =
1254 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1255
1256 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1257 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1258 "Remote IPv4 address cannot be Multicast");
1259 return -EINVAL;
1260 }
1261 }
1262
1263 if (data[IFLA_GENEVE_REMOTE6]) {
1264 #if IS_ENABLED(CONFIG_IPV6)
1265 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1266 attrtype = IFLA_GENEVE_REMOTE6;
1267 goto change_notsup;
1268 }
1269
1270 info->mode = IP_TUNNEL_INFO_IPV6;
1271 info->key.u.ipv6.dst =
1272 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1273
1274 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1275 IPV6_ADDR_LINKLOCAL) {
1276 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1277 "Remote IPv6 address cannot be link-local");
1278 return -EINVAL;
1279 }
1280 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1281 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1282 "Remote IPv6 address cannot be Multicast");
1283 return -EINVAL;
1284 }
1285 info->key.tun_flags |= TUNNEL_CSUM;
1286 *use_udp6_rx_checksums = true;
1287#else
1288 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1289 "IPv6 support not enabled in the kernel");
1290 return -EPFNOSUPPORT;
1291#endif
1292 }
1293
1294 if (data[IFLA_GENEVE_ID]) {
1295 __u32 vni;
1296 __u8 tvni[3];
1297 __be64 tunid;
1298
1299 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1300 tvni[0] = (vni & 0x00ff0000) >> 16;
1301 tvni[1] = (vni & 0x0000ff00) >> 8;
1302 tvni[2] = vni & 0x000000ff;
1303
1304 tunid = vni_to_tunnel_id(tvni);
1305 if (changelink && (tunid != info->key.tun_id)) {
1306 attrtype = IFLA_GENEVE_ID;
1307 goto change_notsup;
1308 }
1309 info->key.tun_id = tunid;
1310 }
1311
1312 if (data[IFLA_GENEVE_TTL])
1313 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1314
1315 if (data[IFLA_GENEVE_TOS])
1316 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1317
1318 if (data[IFLA_GENEVE_LABEL]) {
1319 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1320 IPV6_FLOWLABEL_MASK;
1321 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1322 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1323 "Label attribute only applies for IPv6 Geneve devices");
1324 return -EINVAL;
1325 }
1326 }
1327
1328 if (data[IFLA_GENEVE_PORT]) {
1329 if (changelink) {
1330 attrtype = IFLA_GENEVE_PORT;
1331 goto change_notsup;
1332 }
1333 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1334 }
1335
1336 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1337 if (changelink) {
1338 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1339 goto change_notsup;
1340 }
1341 *metadata = true;
1342 }
1343
1344 if (data[IFLA_GENEVE_UDP_CSUM]) {
1345 if (changelink) {
1346 attrtype = IFLA_GENEVE_UDP_CSUM;
1347 goto change_notsup;
1348 }
1349 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1350 info->key.tun_flags |= TUNNEL_CSUM;
1351 }
1352
1353 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1354#if IS_ENABLED(CONFIG_IPV6)
1355 if (changelink) {
1356 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1357 goto change_notsup;
1358 }
1359 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1360 info->key.tun_flags &= ~TUNNEL_CSUM;
1361#else
1362 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1363 "IPv6 support not enabled in the kernel");
1364 return -EPFNOSUPPORT;
1365#endif
1366 }
1367
1368 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1369#if IS_ENABLED(CONFIG_IPV6)
1370 if (changelink) {
1371 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1372 goto change_notsup;
1373 }
1374 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1375 *use_udp6_rx_checksums = false;
1376#else
1377 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1378 "IPv6 support not enabled in the kernel");
1379 return -EPFNOSUPPORT;
1380#endif
1381 }
1382
1383 return 0;
1384change_notsup:
1385 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1386 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1387 return -EOPNOTSUPP;
1388}
1389
1390static int geneve_newlink(struct net *net, struct net_device *dev,
1391 struct nlattr *tb[], struct nlattr *data[],
1392 struct netlink_ext_ack *extack)
1393{
1394 bool use_udp6_rx_checksums = false;
1395 struct ip_tunnel_info info;
1396 bool metadata = false;
1397 int err;
1398
1399 init_tnl_info(&info, GENEVE_UDP_PORT);
1400 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1401 &use_udp6_rx_checksums, false);
1402 if (err)
1403 return err;
1404
1405 return geneve_configure(net, dev, extack, &info, metadata,
1406 use_udp6_rx_checksums);
1407}
1408
1409/* Quiesces the geneve device data path for both TX and RX.
1410 *
1411 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1412 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1413 * to complete for the existing set of in-flight packets to be transmitted,
1414 * then we would have quiesced the transmit data path. All the future packets
1415 * will get dropped until we unquiesce the data path.
1416 *
1417 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1418 * if we set that to NULL under RCU and wait for synchronize_net() to
1419 * complete, then we would have quiesced the receive data path.
1420 */
1421static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1422 struct geneve_sock **gs6)
1423{
1424 *gs4 = rtnl_dereference(geneve->sock4);
1425 rcu_assign_pointer(geneve->sock4, NULL);
1426 if (*gs4)
1427 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1428#if IS_ENABLED(CONFIG_IPV6)
1429 *gs6 = rtnl_dereference(geneve->sock6);
1430 rcu_assign_pointer(geneve->sock6, NULL);
1431 if (*gs6)
1432 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1433#else
1434 *gs6 = NULL;
1435#endif
1436 synchronize_net();
1437}
1438
1439/* Resumes the geneve device data path for both TX and RX. */
1440static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1441 struct geneve_sock __maybe_unused *gs6)
1442{
1443 rcu_assign_pointer(geneve->sock4, gs4);
1444 if (gs4)
1445 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1446#if IS_ENABLED(CONFIG_IPV6)
1447 rcu_assign_pointer(geneve->sock6, gs6);
1448 if (gs6)
1449 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1450#endif
1451 synchronize_net();
1452}
1453
1454static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1455 struct nlattr *data[],
1456 struct netlink_ext_ack *extack)
1457{
1458 struct geneve_dev *geneve = netdev_priv(dev);
1459 struct geneve_sock *gs4, *gs6;
1460 struct ip_tunnel_info info;
1461 bool metadata;
1462 bool use_udp6_rx_checksums;
1463 int err;
1464
1465 /* If the geneve device is configured for metadata (or externally
1466 * controlled, for example, OVS), then nothing can be changed.
1467 */
1468 if (geneve->collect_md)
1469 return -EOPNOTSUPP;
1470
1471 /* Start with the existing info. */
1472 memcpy(&info, &geneve->info, sizeof(info));
1473 metadata = geneve->collect_md;
1474 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1475 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1476 &use_udp6_rx_checksums, true);
1477 if (err)
1478 return err;
1479
1480 if (!geneve_dst_addr_equal(&geneve->info, &info))
1481 dst_cache_reset(&info.dst_cache);
1482
1483 geneve_quiesce(geneve, &gs4, &gs6);
1484 geneve->info = info;
1485 geneve->collect_md = metadata;
1486 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1487 geneve_unquiesce(geneve, gs4, gs6);
1488
1489 return 0;
1490}
1491
1492static void geneve_dellink(struct net_device *dev, struct list_head *head)
1493{
1494 struct geneve_dev *geneve = netdev_priv(dev);
1495
1496 list_del(&geneve->next);
1497 unregister_netdevice_queue(dev, head);
1498}
1499
1500static size_t geneve_get_size(const struct net_device *dev)
1501{
1502 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1503 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1504 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1505 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1506 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1507 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1508 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1509 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1510 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1511 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1512 0;
1513}
1514
1515static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1516{
1517 struct geneve_dev *geneve = netdev_priv(dev);
1518 struct ip_tunnel_info *info = &geneve->info;
1519 bool metadata = geneve->collect_md;
1520 __u8 tmp_vni[3];
1521 __u32 vni;
1522
1523 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1524 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1525 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1526 goto nla_put_failure;
1527
1528 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1529 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1530 info->key.u.ipv4.dst))
1531 goto nla_put_failure;
1532 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1533 !!(info->key.tun_flags & TUNNEL_CSUM)))
1534 goto nla_put_failure;
1535
1536#if IS_ENABLED(CONFIG_IPV6)
1537 } else if (!metadata) {
1538 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1539 &info->key.u.ipv6.dst))
1540 goto nla_put_failure;
1541 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1542 !(info->key.tun_flags & TUNNEL_CSUM)))
1543 goto nla_put_failure;
1544#endif
1545 }
1546
1547 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1548 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1549 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1550 goto nla_put_failure;
1551
1552 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1553 goto nla_put_failure;
1554
1555 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1556 goto nla_put_failure;
1557
1558#if IS_ENABLED(CONFIG_IPV6)
1559 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1560 !geneve->use_udp6_rx_checksums))
1561 goto nla_put_failure;
1562#endif
1563
1564 return 0;
1565
1566nla_put_failure:
1567 return -EMSGSIZE;
1568}
1569
1570static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1571 .kind = "geneve",
1572 .maxtype = IFLA_GENEVE_MAX,
1573 .policy = geneve_policy,
1574 .priv_size = sizeof(struct geneve_dev),
1575 .setup = geneve_setup,
1576 .validate = geneve_validate,
1577 .newlink = geneve_newlink,
1578 .changelink = geneve_changelink,
1579 .dellink = geneve_dellink,
1580 .get_size = geneve_get_size,
1581 .fill_info = geneve_fill_info,
1582};
1583
1584struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1585 u8 name_assign_type, u16 dst_port)
1586{
1587 struct nlattr *tb[IFLA_MAX + 1];
1588 struct ip_tunnel_info info;
1589 struct net_device *dev;
1590 LIST_HEAD(list_kill);
1591 int err;
1592
1593 memset(tb, 0, sizeof(tb));
1594 dev = rtnl_create_link(net, name, name_assign_type,
1595 &geneve_link_ops, tb);
1596 if (IS_ERR(dev))
1597 return dev;
1598
1599 init_tnl_info(&info, dst_port);
1600 err = geneve_configure(net, dev, NULL, &info, true, true);
1601 if (err) {
1602 free_netdev(dev);
1603 return ERR_PTR(err);
1604 }
1605
1606 /* openvswitch users expect packet sizes to be unrestricted,
1607 * so set the largest MTU we can.
1608 */
1609 err = geneve_change_mtu(dev, IP_MAX_MTU);
1610 if (err)
1611 goto err;
1612
1613 err = rtnl_configure_link(dev, NULL);
1614 if (err < 0)
1615 goto err;
1616
1617 return dev;
1618err:
1619 geneve_dellink(dev, &list_kill);
1620 unregister_netdevice_many(&list_kill);
1621 return ERR_PTR(err);
1622}
1623EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1624
1625static int geneve_netdevice_event(struct notifier_block *unused,
1626 unsigned long event, void *ptr)
1627{
1628 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1629
1630 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1631 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1632 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1633 } else if (event == NETDEV_UNREGISTER) {
1634 geneve_offload_rx_ports(dev, false);
1635 } else if (event == NETDEV_REGISTER) {
1636 geneve_offload_rx_ports(dev, true);
1637 }
1638
1639 return NOTIFY_DONE;
1640}
1641
1642static struct notifier_block geneve_notifier_block __read_mostly = {
1643 .notifier_call = geneve_netdevice_event,
1644};
1645
1646static __net_init int geneve_init_net(struct net *net)
1647{
1648 struct geneve_net *gn = net_generic(net, geneve_net_id);
1649
1650 INIT_LIST_HEAD(&gn->geneve_list);
1651 INIT_LIST_HEAD(&gn->sock_list);
1652 return 0;
1653}
1654
1655static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1656{
1657 struct geneve_net *gn = net_generic(net, geneve_net_id);
1658 struct geneve_dev *geneve, *next;
1659 struct net_device *dev, *aux;
1660
1661 /* gather any geneve devices that were moved into this ns */
1662 for_each_netdev_safe(net, dev, aux)
1663 if (dev->rtnl_link_ops == &geneve_link_ops)
1664 unregister_netdevice_queue(dev, head);
1665
1666 /* now gather any other geneve devices that were created in this ns */
1667 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1668 /* If geneve->dev is in the same netns, it was already added
1669 * to the list by the previous loop.
1670 */
1671 if (!net_eq(dev_net(geneve->dev), net))
1672 unregister_netdevice_queue(geneve->dev, head);
1673 }
1674
1675 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1676}
1677
1678static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1679{
1680 struct net *net;
1681 LIST_HEAD(list);
1682
1683 rtnl_lock();
1684 list_for_each_entry(net, net_list, exit_list)
1685 geneve_destroy_tunnels(net, &list);
1686
1687 /* unregister the devices gathered above */
1688 unregister_netdevice_many(&list);
1689 rtnl_unlock();
1690}
1691
1692static struct pernet_operations geneve_net_ops = {
1693 .init = geneve_init_net,
1694 .exit_batch = geneve_exit_batch_net,
1695 .id = &geneve_net_id,
1696 .size = sizeof(struct geneve_net),
1697};
1698
1699static int __init geneve_init_module(void)
1700{
1701 int rc;
1702
1703 rc = register_pernet_subsys(&geneve_net_ops);
1704 if (rc)
1705 goto out1;
1706
1707 rc = register_netdevice_notifier(&geneve_notifier_block);
1708 if (rc)
1709 goto out2;
1710
1711 rc = rtnl_link_register(&geneve_link_ops);
1712 if (rc)
1713 goto out3;
1714
1715 return 0;
1716out3:
1717 unregister_netdevice_notifier(&geneve_notifier_block);
1718out2:
1719 unregister_pernet_subsys(&geneve_net_ops);
1720out1:
1721 return rc;
1722}
1723late_initcall(geneve_init_module);
1724
1725static void __exit geneve_cleanup_module(void)
1726{
1727 rtnl_link_unregister(&geneve_link_ops);
1728 unregister_netdevice_notifier(&geneve_notifier_block);
1729 unregister_pernet_subsys(&geneve_net_ops);
1730}
1731module_exit(geneve_cleanup_module);
1732
1733MODULE_LICENSE("GPL");
1734MODULE_VERSION(GENEVE_NETDEV_VER);
1735MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1736MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1737MODULE_ALIAS_RTNL_LINK("geneve");
1/*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
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.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
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>
22
23#define GENEVE_NETDEV_VER "0.6"
24
25#define GENEVE_UDP_PORT 6081
26
27#define GENEVE_N_VID (1u << 24)
28#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
29
30#define VNI_HASH_BITS 10
31#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
32
33static bool log_ecn_error = true;
34module_param(log_ecn_error, bool, 0644);
35MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
36
37#define GENEVE_VER 0
38#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
39
40/* per-network namespace private data for this module */
41struct geneve_net {
42 struct list_head geneve_list;
43 struct list_head sock_list;
44};
45
46static unsigned int geneve_net_id;
47
48/* Pseudo network device */
49struct geneve_dev {
50 struct hlist_node hlist; /* vni hash table */
51 struct net *net; /* netns for packet i/o */
52 struct net_device *dev; /* netdev for geneve tunnel */
53 struct ip_tunnel_info info;
54 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
55#if IS_ENABLED(CONFIG_IPV6)
56 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
57#endif
58 struct list_head next; /* geneve's per namespace list */
59 struct gro_cells gro_cells;
60 bool collect_md;
61 bool use_udp6_rx_checksums;
62};
63
64struct geneve_sock {
65 bool collect_md;
66 struct list_head list;
67 struct socket *sock;
68 struct rcu_head rcu;
69 int refcnt;
70 struct hlist_head vni_list[VNI_HASH_SIZE];
71};
72
73static inline __u32 geneve_net_vni_hash(u8 vni[3])
74{
75 __u32 vnid;
76
77 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
78 return hash_32(vnid, VNI_HASH_BITS);
79}
80
81static __be64 vni_to_tunnel_id(const __u8 *vni)
82{
83#ifdef __BIG_ENDIAN
84 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
85#else
86 return (__force __be64)(((__force u64)vni[0] << 40) |
87 ((__force u64)vni[1] << 48) |
88 ((__force u64)vni[2] << 56));
89#endif
90}
91
92/* Convert 64 bit tunnel ID to 24 bit VNI. */
93static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
94{
95#ifdef __BIG_ENDIAN
96 vni[0] = (__force __u8)(tun_id >> 16);
97 vni[1] = (__force __u8)(tun_id >> 8);
98 vni[2] = (__force __u8)tun_id;
99#else
100 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
101 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
102 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
103#endif
104}
105
106static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
107{
108#ifdef __BIG_ENDIAN
109 return (vni[0] == tun_id[2]) &&
110 (vni[1] == tun_id[1]) &&
111 (vni[2] == tun_id[0]);
112#else
113 return !memcmp(vni, &tun_id[5], 3);
114#endif
115}
116
117static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
118{
119 return gs->sock->sk->sk_family;
120}
121
122static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
123 __be32 addr, u8 vni[])
124{
125 struct hlist_head *vni_list_head;
126 struct geneve_dev *geneve;
127 __u32 hash;
128
129 /* Find the device for this VNI */
130 hash = geneve_net_vni_hash(vni);
131 vni_list_head = &gs->vni_list[hash];
132 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
133 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
134 addr == geneve->info.key.u.ipv4.dst)
135 return geneve;
136 }
137 return NULL;
138}
139
140#if IS_ENABLED(CONFIG_IPV6)
141static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
142 struct in6_addr addr6, u8 vni[])
143{
144 struct hlist_head *vni_list_head;
145 struct geneve_dev *geneve;
146 __u32 hash;
147
148 /* Find the device for this VNI */
149 hash = geneve_net_vni_hash(vni);
150 vni_list_head = &gs->vni_list[hash];
151 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
152 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
153 ipv6_addr_equal(&addr6, &geneve->info.key.u.ipv6.dst))
154 return geneve;
155 }
156 return NULL;
157}
158#endif
159
160static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
161{
162 return (struct genevehdr *)(udp_hdr(skb) + 1);
163}
164
165static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
166 struct sk_buff *skb)
167{
168 static u8 zero_vni[3];
169 u8 *vni;
170
171 if (geneve_get_sk_family(gs) == AF_INET) {
172 struct iphdr *iph;
173 __be32 addr;
174
175 iph = ip_hdr(skb); /* outer IP header... */
176
177 if (gs->collect_md) {
178 vni = zero_vni;
179 addr = 0;
180 } else {
181 vni = geneve_hdr(skb)->vni;
182 addr = iph->saddr;
183 }
184
185 return geneve_lookup(gs, addr, vni);
186#if IS_ENABLED(CONFIG_IPV6)
187 } else if (geneve_get_sk_family(gs) == AF_INET6) {
188 static struct in6_addr zero_addr6;
189 struct ipv6hdr *ip6h;
190 struct in6_addr addr6;
191
192 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
193
194 if (gs->collect_md) {
195 vni = zero_vni;
196 addr6 = zero_addr6;
197 } else {
198 vni = geneve_hdr(skb)->vni;
199 addr6 = ip6h->saddr;
200 }
201
202 return geneve6_lookup(gs, addr6, vni);
203#endif
204 }
205 return NULL;
206}
207
208/* geneve receive/decap routine */
209static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
210 struct sk_buff *skb)
211{
212 struct genevehdr *gnvh = geneve_hdr(skb);
213 struct metadata_dst *tun_dst = NULL;
214 struct pcpu_sw_netstats *stats;
215 int err = 0;
216 void *oiph;
217
218 if (ip_tunnel_collect_metadata() || gs->collect_md) {
219 __be16 flags;
220
221 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
222 (gnvh->oam ? TUNNEL_OAM : 0) |
223 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
224
225 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
226 vni_to_tunnel_id(gnvh->vni),
227 gnvh->opt_len * 4);
228 if (!tun_dst)
229 goto drop;
230 /* Update tunnel dst according to Geneve options. */
231 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
232 gnvh->options, gnvh->opt_len * 4);
233 } else {
234 /* Drop packets w/ critical options,
235 * since we don't support any...
236 */
237 if (gnvh->critical)
238 goto drop;
239 }
240
241 skb_reset_mac_header(skb);
242 skb->protocol = eth_type_trans(skb, geneve->dev);
243 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
244
245 if (tun_dst)
246 skb_dst_set(skb, &tun_dst->dst);
247
248 /* Ignore packet loops (and multicast echo) */
249 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
250 goto drop;
251
252 oiph = skb_network_header(skb);
253 skb_reset_network_header(skb);
254
255 if (geneve_get_sk_family(gs) == AF_INET)
256 err = IP_ECN_decapsulate(oiph, skb);
257#if IS_ENABLED(CONFIG_IPV6)
258 else
259 err = IP6_ECN_decapsulate(oiph, skb);
260#endif
261
262 if (unlikely(err)) {
263 if (log_ecn_error) {
264 if (geneve_get_sk_family(gs) == AF_INET)
265 net_info_ratelimited("non-ECT from %pI4 "
266 "with TOS=%#x\n",
267 &((struct iphdr *)oiph)->saddr,
268 ((struct iphdr *)oiph)->tos);
269#if IS_ENABLED(CONFIG_IPV6)
270 else
271 net_info_ratelimited("non-ECT from %pI6\n",
272 &((struct ipv6hdr *)oiph)->saddr);
273#endif
274 }
275 if (err > 1) {
276 ++geneve->dev->stats.rx_frame_errors;
277 ++geneve->dev->stats.rx_errors;
278 goto drop;
279 }
280 }
281
282 stats = this_cpu_ptr(geneve->dev->tstats);
283 u64_stats_update_begin(&stats->syncp);
284 stats->rx_packets++;
285 stats->rx_bytes += skb->len;
286 u64_stats_update_end(&stats->syncp);
287
288 gro_cells_receive(&geneve->gro_cells, skb);
289 return;
290drop:
291 /* Consume bad packet */
292 kfree_skb(skb);
293}
294
295/* Setup stats when device is created */
296static int geneve_init(struct net_device *dev)
297{
298 struct geneve_dev *geneve = netdev_priv(dev);
299 int err;
300
301 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
302 if (!dev->tstats)
303 return -ENOMEM;
304
305 err = gro_cells_init(&geneve->gro_cells, dev);
306 if (err) {
307 free_percpu(dev->tstats);
308 return err;
309 }
310
311 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
312 if (err) {
313 free_percpu(dev->tstats);
314 gro_cells_destroy(&geneve->gro_cells);
315 return err;
316 }
317 return 0;
318}
319
320static void geneve_uninit(struct net_device *dev)
321{
322 struct geneve_dev *geneve = netdev_priv(dev);
323
324 dst_cache_destroy(&geneve->info.dst_cache);
325 gro_cells_destroy(&geneve->gro_cells);
326 free_percpu(dev->tstats);
327}
328
329/* Callback from net/ipv4/udp.c to receive packets */
330static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
331{
332 struct genevehdr *geneveh;
333 struct geneve_dev *geneve;
334 struct geneve_sock *gs;
335 int opts_len;
336
337 /* Need Geneve and inner Ethernet header to be present */
338 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
339 goto drop;
340
341 /* Return packets with reserved bits set */
342 geneveh = geneve_hdr(skb);
343 if (unlikely(geneveh->ver != GENEVE_VER))
344 goto drop;
345
346 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
347 goto drop;
348
349 gs = rcu_dereference_sk_user_data(sk);
350 if (!gs)
351 goto drop;
352
353 geneve = geneve_lookup_skb(gs, skb);
354 if (!geneve)
355 goto drop;
356
357 opts_len = geneveh->opt_len * 4;
358 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
359 htons(ETH_P_TEB),
360 !net_eq(geneve->net, dev_net(geneve->dev))))
361 goto drop;
362
363 geneve_rx(geneve, gs, skb);
364 return 0;
365
366drop:
367 /* Consume bad packet */
368 kfree_skb(skb);
369 return 0;
370}
371
372static struct socket *geneve_create_sock(struct net *net, bool ipv6,
373 __be16 port, bool ipv6_rx_csum)
374{
375 struct socket *sock;
376 struct udp_port_cfg udp_conf;
377 int err;
378
379 memset(&udp_conf, 0, sizeof(udp_conf));
380
381 if (ipv6) {
382 udp_conf.family = AF_INET6;
383 udp_conf.ipv6_v6only = 1;
384 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
385 } else {
386 udp_conf.family = AF_INET;
387 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
388 }
389
390 udp_conf.local_udp_port = port;
391
392 /* Open UDP socket */
393 err = udp_sock_create(net, &udp_conf, &sock);
394 if (err < 0)
395 return ERR_PTR(err);
396
397 return sock;
398}
399
400static int geneve_hlen(struct genevehdr *gh)
401{
402 return sizeof(*gh) + gh->opt_len * 4;
403}
404
405static struct sk_buff **geneve_gro_receive(struct sock *sk,
406 struct sk_buff **head,
407 struct sk_buff *skb)
408{
409 struct sk_buff *p, **pp = NULL;
410 struct genevehdr *gh, *gh2;
411 unsigned int hlen, gh_len, off_gnv;
412 const struct packet_offload *ptype;
413 __be16 type;
414 int flush = 1;
415
416 off_gnv = skb_gro_offset(skb);
417 hlen = off_gnv + sizeof(*gh);
418 gh = skb_gro_header_fast(skb, off_gnv);
419 if (skb_gro_header_hard(skb, hlen)) {
420 gh = skb_gro_header_slow(skb, hlen, off_gnv);
421 if (unlikely(!gh))
422 goto out;
423 }
424
425 if (gh->ver != GENEVE_VER || gh->oam)
426 goto out;
427 gh_len = geneve_hlen(gh);
428
429 hlen = off_gnv + gh_len;
430 if (skb_gro_header_hard(skb, hlen)) {
431 gh = skb_gro_header_slow(skb, hlen, off_gnv);
432 if (unlikely(!gh))
433 goto out;
434 }
435
436 for (p = *head; p; p = p->next) {
437 if (!NAPI_GRO_CB(p)->same_flow)
438 continue;
439
440 gh2 = (struct genevehdr *)(p->data + off_gnv);
441 if (gh->opt_len != gh2->opt_len ||
442 memcmp(gh, gh2, gh_len)) {
443 NAPI_GRO_CB(p)->same_flow = 0;
444 continue;
445 }
446 }
447
448 type = gh->proto_type;
449
450 rcu_read_lock();
451 ptype = gro_find_receive_by_type(type);
452 if (!ptype)
453 goto out_unlock;
454
455 skb_gro_pull(skb, gh_len);
456 skb_gro_postpull_rcsum(skb, gh, gh_len);
457 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
458 flush = 0;
459
460out_unlock:
461 rcu_read_unlock();
462out:
463 NAPI_GRO_CB(skb)->flush |= flush;
464
465 return pp;
466}
467
468static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
469 int nhoff)
470{
471 struct genevehdr *gh;
472 struct packet_offload *ptype;
473 __be16 type;
474 int gh_len;
475 int err = -ENOSYS;
476
477 gh = (struct genevehdr *)(skb->data + nhoff);
478 gh_len = geneve_hlen(gh);
479 type = gh->proto_type;
480
481 rcu_read_lock();
482 ptype = gro_find_complete_by_type(type);
483 if (ptype)
484 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
485
486 rcu_read_unlock();
487
488 skb_set_inner_mac_header(skb, nhoff + gh_len);
489
490 return err;
491}
492
493/* Create new listen socket if needed */
494static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
495 bool ipv6, bool ipv6_rx_csum)
496{
497 struct geneve_net *gn = net_generic(net, geneve_net_id);
498 struct geneve_sock *gs;
499 struct socket *sock;
500 struct udp_tunnel_sock_cfg tunnel_cfg;
501 int h;
502
503 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
504 if (!gs)
505 return ERR_PTR(-ENOMEM);
506
507 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
508 if (IS_ERR(sock)) {
509 kfree(gs);
510 return ERR_CAST(sock);
511 }
512
513 gs->sock = sock;
514 gs->refcnt = 1;
515 for (h = 0; h < VNI_HASH_SIZE; ++h)
516 INIT_HLIST_HEAD(&gs->vni_list[h]);
517
518 /* Initialize the geneve udp offloads structure */
519 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
520
521 /* Mark socket as an encapsulation socket */
522 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
523 tunnel_cfg.sk_user_data = gs;
524 tunnel_cfg.encap_type = 1;
525 tunnel_cfg.gro_receive = geneve_gro_receive;
526 tunnel_cfg.gro_complete = geneve_gro_complete;
527 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
528 tunnel_cfg.encap_destroy = NULL;
529 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
530 list_add(&gs->list, &gn->sock_list);
531 return gs;
532}
533
534static void __geneve_sock_release(struct geneve_sock *gs)
535{
536 if (!gs || --gs->refcnt)
537 return;
538
539 list_del(&gs->list);
540 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
541 udp_tunnel_sock_release(gs->sock);
542 kfree_rcu(gs, rcu);
543}
544
545static void geneve_sock_release(struct geneve_dev *geneve)
546{
547 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
548#if IS_ENABLED(CONFIG_IPV6)
549 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
550
551 rcu_assign_pointer(geneve->sock6, NULL);
552#endif
553
554 rcu_assign_pointer(geneve->sock4, NULL);
555 synchronize_net();
556
557 __geneve_sock_release(gs4);
558#if IS_ENABLED(CONFIG_IPV6)
559 __geneve_sock_release(gs6);
560#endif
561}
562
563static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
564 sa_family_t family,
565 __be16 dst_port)
566{
567 struct geneve_sock *gs;
568
569 list_for_each_entry(gs, &gn->sock_list, list) {
570 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
571 geneve_get_sk_family(gs) == family) {
572 return gs;
573 }
574 }
575 return NULL;
576}
577
578static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
579{
580 struct net *net = geneve->net;
581 struct geneve_net *gn = net_generic(net, geneve_net_id);
582 struct geneve_sock *gs;
583 __u8 vni[3];
584 __u32 hash;
585
586 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
587 if (gs) {
588 gs->refcnt++;
589 goto out;
590 }
591
592 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
593 geneve->use_udp6_rx_checksums);
594 if (IS_ERR(gs))
595 return PTR_ERR(gs);
596
597out:
598 gs->collect_md = geneve->collect_md;
599#if IS_ENABLED(CONFIG_IPV6)
600 if (ipv6)
601 rcu_assign_pointer(geneve->sock6, gs);
602 else
603#endif
604 rcu_assign_pointer(geneve->sock4, gs);
605
606 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
607 hash = geneve_net_vni_hash(vni);
608 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
609 return 0;
610}
611
612static int geneve_open(struct net_device *dev)
613{
614 struct geneve_dev *geneve = netdev_priv(dev);
615 bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
616 bool metadata = geneve->collect_md;
617 int ret = 0;
618
619#if IS_ENABLED(CONFIG_IPV6)
620 if (ipv6 || metadata)
621 ret = geneve_sock_add(geneve, true);
622#endif
623 if (!ret && (!ipv6 || metadata))
624 ret = geneve_sock_add(geneve, false);
625 if (ret < 0)
626 geneve_sock_release(geneve);
627
628 return ret;
629}
630
631static int geneve_stop(struct net_device *dev)
632{
633 struct geneve_dev *geneve = netdev_priv(dev);
634
635 if (!hlist_unhashed(&geneve->hlist))
636 hlist_del_rcu(&geneve->hlist);
637 geneve_sock_release(geneve);
638 return 0;
639}
640
641static void geneve_build_header(struct genevehdr *geneveh,
642 const struct ip_tunnel_info *info)
643{
644 geneveh->ver = GENEVE_VER;
645 geneveh->opt_len = info->options_len / 4;
646 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
647 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
648 geneveh->rsvd1 = 0;
649 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
650 geneveh->proto_type = htons(ETH_P_TEB);
651 geneveh->rsvd2 = 0;
652
653 ip_tunnel_info_opts_get(geneveh->options, info);
654}
655
656static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
657 const struct ip_tunnel_info *info,
658 bool xnet, int ip_hdr_len)
659{
660 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
661 struct genevehdr *gnvh;
662 int min_headroom;
663 int err;
664
665 skb_reset_mac_header(skb);
666 skb_scrub_packet(skb, xnet);
667
668 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
669 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
670 err = skb_cow_head(skb, min_headroom);
671 if (unlikely(err))
672 goto free_dst;
673
674 err = udp_tunnel_handle_offloads(skb, udp_sum);
675 if (err)
676 goto free_dst;
677
678 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) +
679 info->options_len);
680 geneve_build_header(gnvh, info);
681 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
682 return 0;
683
684free_dst:
685 dst_release(dst);
686 return err;
687}
688
689static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
690 struct net_device *dev,
691 struct flowi4 *fl4,
692 const struct ip_tunnel_info *info)
693{
694 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
695 struct geneve_dev *geneve = netdev_priv(dev);
696 struct dst_cache *dst_cache;
697 struct rtable *rt = NULL;
698 __u8 tos;
699
700 if (!rcu_dereference(geneve->sock4))
701 return ERR_PTR(-EIO);
702
703 memset(fl4, 0, sizeof(*fl4));
704 fl4->flowi4_mark = skb->mark;
705 fl4->flowi4_proto = IPPROTO_UDP;
706 fl4->daddr = info->key.u.ipv4.dst;
707 fl4->saddr = info->key.u.ipv4.src;
708
709 tos = info->key.tos;
710 if ((tos == 1) && !geneve->collect_md) {
711 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
712 use_cache = false;
713 }
714 fl4->flowi4_tos = RT_TOS(tos);
715
716 dst_cache = (struct dst_cache *)&info->dst_cache;
717 if (use_cache) {
718 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
719 if (rt)
720 return rt;
721 }
722 rt = ip_route_output_key(geneve->net, fl4);
723 if (IS_ERR(rt)) {
724 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
725 return ERR_PTR(-ENETUNREACH);
726 }
727 if (rt->dst.dev == dev) { /* is this necessary? */
728 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
729 ip_rt_put(rt);
730 return ERR_PTR(-ELOOP);
731 }
732 if (use_cache)
733 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
734 return rt;
735}
736
737#if IS_ENABLED(CONFIG_IPV6)
738static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
739 struct net_device *dev,
740 struct flowi6 *fl6,
741 const struct ip_tunnel_info *info)
742{
743 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
744 struct geneve_dev *geneve = netdev_priv(dev);
745 struct dst_entry *dst = NULL;
746 struct dst_cache *dst_cache;
747 struct geneve_sock *gs6;
748 __u8 prio;
749
750 gs6 = rcu_dereference(geneve->sock6);
751 if (!gs6)
752 return ERR_PTR(-EIO);
753
754 memset(fl6, 0, sizeof(*fl6));
755 fl6->flowi6_mark = skb->mark;
756 fl6->flowi6_proto = IPPROTO_UDP;
757 fl6->daddr = info->key.u.ipv6.dst;
758 fl6->saddr = info->key.u.ipv6.src;
759 prio = info->key.tos;
760 if ((prio == 1) && !geneve->collect_md) {
761 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
762 use_cache = false;
763 }
764
765 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
766 info->key.label);
767 dst_cache = (struct dst_cache *)&info->dst_cache;
768 if (use_cache) {
769 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
770 if (dst)
771 return dst;
772 }
773 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
774 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
775 return ERR_PTR(-ENETUNREACH);
776 }
777 if (dst->dev == dev) { /* is this necessary? */
778 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
779 dst_release(dst);
780 return ERR_PTR(-ELOOP);
781 }
782
783 if (use_cache)
784 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
785 return dst;
786}
787#endif
788
789static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
790 struct geneve_dev *geneve,
791 const struct ip_tunnel_info *info)
792{
793 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
794 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
795 const struct ip_tunnel_key *key = &info->key;
796 struct rtable *rt;
797 struct flowi4 fl4;
798 __u8 tos, ttl;
799 __be16 sport;
800 __be16 df;
801 int err;
802
803 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
804 if (IS_ERR(rt))
805 return PTR_ERR(rt);
806
807 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
808 if (geneve->collect_md) {
809 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
810 ttl = key->ttl;
811 } else {
812 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
813 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
814 }
815 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
816
817 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
818 if (unlikely(err))
819 return err;
820
821 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
822 tos, ttl, df, sport, geneve->info.key.tp_dst,
823 !net_eq(geneve->net, dev_net(geneve->dev)),
824 !(info->key.tun_flags & TUNNEL_CSUM));
825 return 0;
826}
827
828#if IS_ENABLED(CONFIG_IPV6)
829static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
830 struct geneve_dev *geneve,
831 const struct ip_tunnel_info *info)
832{
833 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
834 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
835 const struct ip_tunnel_key *key = &info->key;
836 struct dst_entry *dst = NULL;
837 struct flowi6 fl6;
838 __u8 prio, ttl;
839 __be16 sport;
840 int err;
841
842 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
843 if (IS_ERR(dst))
844 return PTR_ERR(dst);
845
846 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
847 if (geneve->collect_md) {
848 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
849 ttl = key->ttl;
850 } else {
851 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
852 ip_hdr(skb), skb);
853 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
854 }
855 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
856 if (unlikely(err))
857 return err;
858
859 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
860 &fl6.saddr, &fl6.daddr, prio, ttl,
861 info->key.label, sport, geneve->info.key.tp_dst,
862 !(info->key.tun_flags & TUNNEL_CSUM));
863 return 0;
864}
865#endif
866
867static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
868{
869 struct geneve_dev *geneve = netdev_priv(dev);
870 struct ip_tunnel_info *info = NULL;
871 int err;
872
873 if (geneve->collect_md) {
874 info = skb_tunnel_info(skb);
875 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
876 err = -EINVAL;
877 netdev_dbg(dev, "no tunnel metadata\n");
878 goto tx_error;
879 }
880 } else {
881 info = &geneve->info;
882 }
883
884 rcu_read_lock();
885#if IS_ENABLED(CONFIG_IPV6)
886 if (info->mode & IP_TUNNEL_INFO_IPV6)
887 err = geneve6_xmit_skb(skb, dev, geneve, info);
888 else
889#endif
890 err = geneve_xmit_skb(skb, dev, geneve, info);
891 rcu_read_unlock();
892
893 if (likely(!err))
894 return NETDEV_TX_OK;
895tx_error:
896 dev_kfree_skb(skb);
897
898 if (err == -ELOOP)
899 dev->stats.collisions++;
900 else if (err == -ENETUNREACH)
901 dev->stats.tx_carrier_errors++;
902
903 dev->stats.tx_errors++;
904 return NETDEV_TX_OK;
905}
906
907static int geneve_change_mtu(struct net_device *dev, int new_mtu)
908{
909 /* Only possible if called internally, ndo_change_mtu path's new_mtu
910 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
911 */
912 if (new_mtu > dev->max_mtu)
913 new_mtu = dev->max_mtu;
914
915 dev->mtu = new_mtu;
916 return 0;
917}
918
919static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
920{
921 struct ip_tunnel_info *info = skb_tunnel_info(skb);
922 struct geneve_dev *geneve = netdev_priv(dev);
923
924 if (ip_tunnel_info_af(info) == AF_INET) {
925 struct rtable *rt;
926 struct flowi4 fl4;
927
928 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
929 if (IS_ERR(rt))
930 return PTR_ERR(rt);
931
932 ip_rt_put(rt);
933 info->key.u.ipv4.src = fl4.saddr;
934#if IS_ENABLED(CONFIG_IPV6)
935 } else if (ip_tunnel_info_af(info) == AF_INET6) {
936 struct dst_entry *dst;
937 struct flowi6 fl6;
938
939 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
940 if (IS_ERR(dst))
941 return PTR_ERR(dst);
942
943 dst_release(dst);
944 info->key.u.ipv6.src = fl6.saddr;
945#endif
946 } else {
947 return -EINVAL;
948 }
949
950 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
951 1, USHRT_MAX, true);
952 info->key.tp_dst = geneve->info.key.tp_dst;
953 return 0;
954}
955
956static const struct net_device_ops geneve_netdev_ops = {
957 .ndo_init = geneve_init,
958 .ndo_uninit = geneve_uninit,
959 .ndo_open = geneve_open,
960 .ndo_stop = geneve_stop,
961 .ndo_start_xmit = geneve_xmit,
962 .ndo_get_stats64 = ip_tunnel_get_stats64,
963 .ndo_change_mtu = geneve_change_mtu,
964 .ndo_validate_addr = eth_validate_addr,
965 .ndo_set_mac_address = eth_mac_addr,
966 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
967};
968
969static void geneve_get_drvinfo(struct net_device *dev,
970 struct ethtool_drvinfo *drvinfo)
971{
972 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
973 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
974}
975
976static const struct ethtool_ops geneve_ethtool_ops = {
977 .get_drvinfo = geneve_get_drvinfo,
978 .get_link = ethtool_op_get_link,
979};
980
981/* Info for udev, that this is a virtual tunnel endpoint */
982static struct device_type geneve_type = {
983 .name = "geneve",
984};
985
986/* Calls the ndo_udp_tunnel_add of the caller in order to
987 * supply the listening GENEVE udp ports. Callers are expected
988 * to implement the ndo_udp_tunnel_add.
989 */
990static void geneve_push_rx_ports(struct net_device *dev)
991{
992 struct net *net = dev_net(dev);
993 struct geneve_net *gn = net_generic(net, geneve_net_id);
994 struct geneve_sock *gs;
995
996 rcu_read_lock();
997 list_for_each_entry_rcu(gs, &gn->sock_list, list)
998 udp_tunnel_push_rx_port(dev, gs->sock,
999 UDP_TUNNEL_TYPE_GENEVE);
1000 rcu_read_unlock();
1001}
1002
1003/* Initialize the device structure. */
1004static void geneve_setup(struct net_device *dev)
1005{
1006 ether_setup(dev);
1007
1008 dev->netdev_ops = &geneve_netdev_ops;
1009 dev->ethtool_ops = &geneve_ethtool_ops;
1010 dev->destructor = free_netdev;
1011
1012 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1013
1014 dev->features |= NETIF_F_LLTX;
1015 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1016 dev->features |= NETIF_F_RXCSUM;
1017 dev->features |= NETIF_F_GSO_SOFTWARE;
1018
1019 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1020 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1021
1022 /* MTU range: 68 - (something less than 65535) */
1023 dev->min_mtu = ETH_MIN_MTU;
1024 /* The max_mtu calculation does not take account of GENEVE
1025 * options, to avoid excluding potentially valid
1026 * configurations. This will be further reduced by IPvX hdr size.
1027 */
1028 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1029
1030 netif_keep_dst(dev);
1031 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1032 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1033 eth_hw_addr_random(dev);
1034}
1035
1036static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1037 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1038 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1039 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1040 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1041 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1042 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1043 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1044 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1045 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1046 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1047 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1048};
1049
1050static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1051{
1052 if (tb[IFLA_ADDRESS]) {
1053 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1054 return -EINVAL;
1055
1056 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1057 return -EADDRNOTAVAIL;
1058 }
1059
1060 if (!data)
1061 return -EINVAL;
1062
1063 if (data[IFLA_GENEVE_ID]) {
1064 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1065
1066 if (vni >= GENEVE_VID_MASK)
1067 return -ERANGE;
1068 }
1069
1070 return 0;
1071}
1072
1073static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1074 const struct ip_tunnel_info *info,
1075 bool *tun_on_same_port,
1076 bool *tun_collect_md)
1077{
1078 struct geneve_dev *geneve, *t = NULL;
1079
1080 *tun_on_same_port = false;
1081 *tun_collect_md = false;
1082 list_for_each_entry(geneve, &gn->geneve_list, next) {
1083 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1084 *tun_collect_md = geneve->collect_md;
1085 *tun_on_same_port = true;
1086 }
1087 if (info->key.tun_id == geneve->info.key.tun_id &&
1088 info->key.tp_dst == geneve->info.key.tp_dst &&
1089 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1090 t = geneve;
1091 }
1092 return t;
1093}
1094
1095static bool is_all_zero(const u8 *fp, size_t size)
1096{
1097 int i;
1098
1099 for (i = 0; i < size; i++)
1100 if (fp[i])
1101 return false;
1102 return true;
1103}
1104
1105static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1106{
1107 if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1108 info->key.ttl || info->key.label || info->key.tp_src ||
1109 !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1110 return false;
1111 else
1112 return true;
1113}
1114
1115static int geneve_configure(struct net *net, struct net_device *dev,
1116 const struct ip_tunnel_info *info,
1117 bool metadata, bool ipv6_rx_csum)
1118{
1119 struct geneve_net *gn = net_generic(net, geneve_net_id);
1120 struct geneve_dev *t, *geneve = netdev_priv(dev);
1121 bool tun_collect_md, tun_on_same_port;
1122 int err, encap_len;
1123
1124 if (metadata && !is_tnl_info_zero(info))
1125 return -EINVAL;
1126
1127 geneve->net = net;
1128 geneve->dev = dev;
1129
1130 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1131 if (t)
1132 return -EBUSY;
1133
1134 /* make enough headroom for basic scenario */
1135 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1136 if (ip_tunnel_info_af(info) == AF_INET) {
1137 encap_len += sizeof(struct iphdr);
1138 dev->max_mtu -= sizeof(struct iphdr);
1139 } else {
1140 encap_len += sizeof(struct ipv6hdr);
1141 dev->max_mtu -= sizeof(struct ipv6hdr);
1142 }
1143 dev->needed_headroom = encap_len + ETH_HLEN;
1144
1145 if (metadata) {
1146 if (tun_on_same_port)
1147 return -EPERM;
1148 } else {
1149 if (tun_collect_md)
1150 return -EPERM;
1151 }
1152
1153 dst_cache_reset(&geneve->info.dst_cache);
1154 geneve->info = *info;
1155 geneve->collect_md = metadata;
1156 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1157
1158 err = register_netdevice(dev);
1159 if (err)
1160 return err;
1161
1162 list_add(&geneve->next, &gn->geneve_list);
1163 return 0;
1164}
1165
1166static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1167{
1168 memset(info, 0, sizeof(*info));
1169 info->key.tp_dst = htons(dst_port);
1170}
1171
1172static int geneve_newlink(struct net *net, struct net_device *dev,
1173 struct nlattr *tb[], struct nlattr *data[])
1174{
1175 bool use_udp6_rx_checksums = false;
1176 struct ip_tunnel_info info;
1177 bool metadata = false;
1178
1179 init_tnl_info(&info, GENEVE_UDP_PORT);
1180
1181 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1182 return -EINVAL;
1183
1184 if (data[IFLA_GENEVE_REMOTE]) {
1185 info.key.u.ipv4.dst =
1186 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1187
1188 if (IN_MULTICAST(ntohl(info.key.u.ipv4.dst))) {
1189 netdev_dbg(dev, "multicast remote is unsupported\n");
1190 return -EINVAL;
1191 }
1192 }
1193
1194 if (data[IFLA_GENEVE_REMOTE6]) {
1195 #if IS_ENABLED(CONFIG_IPV6)
1196 info.mode = IP_TUNNEL_INFO_IPV6;
1197 info.key.u.ipv6.dst =
1198 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1199
1200 if (ipv6_addr_type(&info.key.u.ipv6.dst) &
1201 IPV6_ADDR_LINKLOCAL) {
1202 netdev_dbg(dev, "link-local remote is unsupported\n");
1203 return -EINVAL;
1204 }
1205 if (ipv6_addr_is_multicast(&info.key.u.ipv6.dst)) {
1206 netdev_dbg(dev, "multicast remote is unsupported\n");
1207 return -EINVAL;
1208 }
1209 info.key.tun_flags |= TUNNEL_CSUM;
1210 use_udp6_rx_checksums = true;
1211#else
1212 return -EPFNOSUPPORT;
1213#endif
1214 }
1215
1216 if (data[IFLA_GENEVE_ID]) {
1217 __u32 vni;
1218 __u8 tvni[3];
1219
1220 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1221 tvni[0] = (vni & 0x00ff0000) >> 16;
1222 tvni[1] = (vni & 0x0000ff00) >> 8;
1223 tvni[2] = vni & 0x000000ff;
1224
1225 info.key.tun_id = vni_to_tunnel_id(tvni);
1226 }
1227 if (data[IFLA_GENEVE_TTL])
1228 info.key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1229
1230 if (data[IFLA_GENEVE_TOS])
1231 info.key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1232
1233 if (data[IFLA_GENEVE_LABEL]) {
1234 info.key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1235 IPV6_FLOWLABEL_MASK;
1236 if (info.key.label && (!(info.mode & IP_TUNNEL_INFO_IPV6)))
1237 return -EINVAL;
1238 }
1239
1240 if (data[IFLA_GENEVE_PORT])
1241 info.key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1242
1243 if (data[IFLA_GENEVE_COLLECT_METADATA])
1244 metadata = true;
1245
1246 if (data[IFLA_GENEVE_UDP_CSUM] &&
1247 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1248 info.key.tun_flags |= TUNNEL_CSUM;
1249
1250 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1251 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1252 info.key.tun_flags &= ~TUNNEL_CSUM;
1253
1254 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1255 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1256 use_udp6_rx_checksums = false;
1257
1258 return geneve_configure(net, dev, &info, metadata, use_udp6_rx_checksums);
1259}
1260
1261static void geneve_dellink(struct net_device *dev, struct list_head *head)
1262{
1263 struct geneve_dev *geneve = netdev_priv(dev);
1264
1265 list_del(&geneve->next);
1266 unregister_netdevice_queue(dev, head);
1267}
1268
1269static size_t geneve_get_size(const struct net_device *dev)
1270{
1271 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1272 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1273 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1274 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1275 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1276 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1277 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1278 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1279 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1280 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1281 0;
1282}
1283
1284static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1285{
1286 struct geneve_dev *geneve = netdev_priv(dev);
1287 struct ip_tunnel_info *info = &geneve->info;
1288 __u8 tmp_vni[3];
1289 __u32 vni;
1290
1291 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1292 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1293 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1294 goto nla_put_failure;
1295
1296 if (ip_tunnel_info_af(info) == AF_INET) {
1297 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1298 info->key.u.ipv4.dst))
1299 goto nla_put_failure;
1300
1301 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1302 !!(info->key.tun_flags & TUNNEL_CSUM)))
1303 goto nla_put_failure;
1304
1305#if IS_ENABLED(CONFIG_IPV6)
1306 } else {
1307 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1308 &info->key.u.ipv6.dst))
1309 goto nla_put_failure;
1310
1311 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1312 !(info->key.tun_flags & TUNNEL_CSUM)))
1313 goto nla_put_failure;
1314
1315 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1316 !geneve->use_udp6_rx_checksums))
1317 goto nla_put_failure;
1318#endif
1319 }
1320
1321 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1322 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1323 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1324 goto nla_put_failure;
1325
1326 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1327 goto nla_put_failure;
1328
1329 if (geneve->collect_md) {
1330 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1331 goto nla_put_failure;
1332 }
1333 return 0;
1334
1335nla_put_failure:
1336 return -EMSGSIZE;
1337}
1338
1339static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1340 .kind = "geneve",
1341 .maxtype = IFLA_GENEVE_MAX,
1342 .policy = geneve_policy,
1343 .priv_size = sizeof(struct geneve_dev),
1344 .setup = geneve_setup,
1345 .validate = geneve_validate,
1346 .newlink = geneve_newlink,
1347 .dellink = geneve_dellink,
1348 .get_size = geneve_get_size,
1349 .fill_info = geneve_fill_info,
1350};
1351
1352struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1353 u8 name_assign_type, u16 dst_port)
1354{
1355 struct nlattr *tb[IFLA_MAX + 1];
1356 struct ip_tunnel_info info;
1357 struct net_device *dev;
1358 LIST_HEAD(list_kill);
1359 int err;
1360
1361 memset(tb, 0, sizeof(tb));
1362 dev = rtnl_create_link(net, name, name_assign_type,
1363 &geneve_link_ops, tb);
1364 if (IS_ERR(dev))
1365 return dev;
1366
1367 init_tnl_info(&info, dst_port);
1368 err = geneve_configure(net, dev, &info, true, true);
1369 if (err) {
1370 free_netdev(dev);
1371 return ERR_PTR(err);
1372 }
1373
1374 /* openvswitch users expect packet sizes to be unrestricted,
1375 * so set the largest MTU we can.
1376 */
1377 err = geneve_change_mtu(dev, IP_MAX_MTU);
1378 if (err)
1379 goto err;
1380
1381 err = rtnl_configure_link(dev, NULL);
1382 if (err < 0)
1383 goto err;
1384
1385 return dev;
1386err:
1387 geneve_dellink(dev, &list_kill);
1388 unregister_netdevice_many(&list_kill);
1389 return ERR_PTR(err);
1390}
1391EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1392
1393static int geneve_netdevice_event(struct notifier_block *unused,
1394 unsigned long event, void *ptr)
1395{
1396 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1397
1398 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1399 geneve_push_rx_ports(dev);
1400
1401 return NOTIFY_DONE;
1402}
1403
1404static struct notifier_block geneve_notifier_block __read_mostly = {
1405 .notifier_call = geneve_netdevice_event,
1406};
1407
1408static __net_init int geneve_init_net(struct net *net)
1409{
1410 struct geneve_net *gn = net_generic(net, geneve_net_id);
1411
1412 INIT_LIST_HEAD(&gn->geneve_list);
1413 INIT_LIST_HEAD(&gn->sock_list);
1414 return 0;
1415}
1416
1417static void __net_exit geneve_exit_net(struct net *net)
1418{
1419 struct geneve_net *gn = net_generic(net, geneve_net_id);
1420 struct geneve_dev *geneve, *next;
1421 struct net_device *dev, *aux;
1422 LIST_HEAD(list);
1423
1424 rtnl_lock();
1425
1426 /* gather any geneve devices that were moved into this ns */
1427 for_each_netdev_safe(net, dev, aux)
1428 if (dev->rtnl_link_ops == &geneve_link_ops)
1429 unregister_netdevice_queue(dev, &list);
1430
1431 /* now gather any other geneve devices that were created in this ns */
1432 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1433 /* If geneve->dev is in the same netns, it was already added
1434 * to the list by the previous loop.
1435 */
1436 if (!net_eq(dev_net(geneve->dev), net))
1437 unregister_netdevice_queue(geneve->dev, &list);
1438 }
1439
1440 /* unregister the devices gathered above */
1441 unregister_netdevice_many(&list);
1442 rtnl_unlock();
1443}
1444
1445static struct pernet_operations geneve_net_ops = {
1446 .init = geneve_init_net,
1447 .exit = geneve_exit_net,
1448 .id = &geneve_net_id,
1449 .size = sizeof(struct geneve_net),
1450};
1451
1452static int __init geneve_init_module(void)
1453{
1454 int rc;
1455
1456 rc = register_pernet_subsys(&geneve_net_ops);
1457 if (rc)
1458 goto out1;
1459
1460 rc = register_netdevice_notifier(&geneve_notifier_block);
1461 if (rc)
1462 goto out2;
1463
1464 rc = rtnl_link_register(&geneve_link_ops);
1465 if (rc)
1466 goto out3;
1467
1468 return 0;
1469out3:
1470 unregister_netdevice_notifier(&geneve_notifier_block);
1471out2:
1472 unregister_pernet_subsys(&geneve_net_ops);
1473out1:
1474 return rc;
1475}
1476late_initcall(geneve_init_module);
1477
1478static void __exit geneve_cleanup_module(void)
1479{
1480 rtnl_link_unregister(&geneve_link_ops);
1481 unregister_netdevice_notifier(&geneve_notifier_block);
1482 unregister_pernet_subsys(&geneve_net_ops);
1483}
1484module_exit(geneve_cleanup_module);
1485
1486MODULE_LICENSE("GPL");
1487MODULE_VERSION(GENEVE_NETDEV_VER);
1488MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1489MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1490MODULE_ALIAS_RTNL_LINK("geneve");