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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GENEVE: Generic Network Virtualization Encapsulation
4 *
5 * Copyright (c) 2015 Red Hat, Inc.
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/ethtool.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/etherdevice.h>
14#include <linux/hash.h>
15#include <net/ipv6_stubs.h>
16#include <net/dst_metadata.h>
17#include <net/gro_cells.h>
18#include <net/rtnetlink.h>
19#include <net/geneve.h>
20#include <net/gro.h>
21#include <net/protocol.h>
22
23#define GENEVE_NETDEV_VER "0.6"
24
25#define GENEVE_N_VID (1u << 24)
26#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
27
28#define VNI_HASH_BITS 10
29#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
30
31static bool log_ecn_error = true;
32module_param(log_ecn_error, bool, 0644);
33MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
34
35#define GENEVE_VER 0
36#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
37#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
38#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
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
53struct geneve_config {
54 struct ip_tunnel_info info;
55 bool collect_md;
56 bool use_udp6_rx_checksums;
57 bool ttl_inherit;
58 enum ifla_geneve_df df;
59 bool inner_proto_inherit;
60};
61
62/* Pseudo network device */
63struct geneve_dev {
64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
65#if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
67#endif
68 struct net *net; /* netns for packet i/o */
69 struct net_device *dev; /* netdev for geneve tunnel */
70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
71#if IS_ENABLED(CONFIG_IPV6)
72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
73#endif
74 struct list_head next; /* geneve's per namespace list */
75 struct gro_cells gro_cells;
76 struct geneve_config cfg;
77};
78
79struct geneve_sock {
80 bool collect_md;
81 struct list_head list;
82 struct socket *sock;
83 struct rcu_head rcu;
84 int refcnt;
85 struct hlist_head vni_list[VNI_HASH_SIZE];
86};
87
88static inline __u32 geneve_net_vni_hash(u8 vni[3])
89{
90 __u32 vnid;
91
92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
93 return hash_32(vnid, VNI_HASH_BITS);
94}
95
96static __be64 vni_to_tunnel_id(const __u8 *vni)
97{
98#ifdef __BIG_ENDIAN
99 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
100#else
101 return (__force __be64)(((__force u64)vni[0] << 40) |
102 ((__force u64)vni[1] << 48) |
103 ((__force u64)vni[2] << 56));
104#endif
105}
106
107/* Convert 64 bit tunnel ID to 24 bit VNI. */
108static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
109{
110#ifdef __BIG_ENDIAN
111 vni[0] = (__force __u8)(tun_id >> 16);
112 vni[1] = (__force __u8)(tun_id >> 8);
113 vni[2] = (__force __u8)tun_id;
114#else
115 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
116 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
117 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
118#endif
119}
120
121static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
122{
123 return !memcmp(vni, &tun_id[5], 3);
124}
125
126static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
127{
128 return gs->sock->sk->sk_family;
129}
130
131static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
132 __be32 addr, u8 vni[])
133{
134 struct hlist_head *vni_list_head;
135 struct geneve_dev_node *node;
136 __u32 hash;
137
138 /* Find the device for this VNI */
139 hash = geneve_net_vni_hash(vni);
140 vni_list_head = &gs->vni_list[hash];
141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
143 addr == node->geneve->cfg.info.key.u.ipv4.dst)
144 return node->geneve;
145 }
146 return NULL;
147}
148
149#if IS_ENABLED(CONFIG_IPV6)
150static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
151 struct in6_addr addr6, u8 vni[])
152{
153 struct hlist_head *vni_list_head;
154 struct geneve_dev_node *node;
155 __u32 hash;
156
157 /* Find the device for this VNI */
158 hash = geneve_net_vni_hash(vni);
159 vni_list_head = &gs->vni_list[hash];
160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
163 return node->geneve;
164 }
165 return NULL;
166}
167#endif
168
169static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
170{
171 return (struct genevehdr *)(udp_hdr(skb) + 1);
172}
173
174static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
175 struct sk_buff *skb)
176{
177 static u8 zero_vni[3];
178 u8 *vni;
179
180 if (geneve_get_sk_family(gs) == AF_INET) {
181 struct iphdr *iph;
182 __be32 addr;
183
184 iph = ip_hdr(skb); /* outer IP header... */
185
186 if (gs->collect_md) {
187 vni = zero_vni;
188 addr = 0;
189 } else {
190 vni = geneve_hdr(skb)->vni;
191 addr = iph->saddr;
192 }
193
194 return geneve_lookup(gs, addr, vni);
195#if IS_ENABLED(CONFIG_IPV6)
196 } else if (geneve_get_sk_family(gs) == AF_INET6) {
197 static struct in6_addr zero_addr6;
198 struct ipv6hdr *ip6h;
199 struct in6_addr addr6;
200
201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
202
203 if (gs->collect_md) {
204 vni = zero_vni;
205 addr6 = zero_addr6;
206 } else {
207 vni = geneve_hdr(skb)->vni;
208 addr6 = ip6h->saddr;
209 }
210
211 return geneve6_lookup(gs, addr6, vni);
212#endif
213 }
214 return NULL;
215}
216
217/* geneve receive/decap routine */
218static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
219 struct sk_buff *skb)
220{
221 struct genevehdr *gnvh = geneve_hdr(skb);
222 struct metadata_dst *tun_dst = NULL;
223 unsigned int len;
224 int nh, err = 0;
225 void *oiph;
226
227 if (ip_tunnel_collect_metadata() || gs->collect_md) {
228 __be16 flags;
229
230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
232
233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
234 vni_to_tunnel_id(gnvh->vni),
235 gnvh->opt_len * 4);
236 if (!tun_dst) {
237 DEV_STATS_INC(geneve->dev, rx_dropped);
238 goto drop;
239 }
240 /* Update tunnel dst according to Geneve options. */
241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
242 gnvh->options, gnvh->opt_len * 4,
243 TUNNEL_GENEVE_OPT);
244 } else {
245 /* Drop packets w/ critical options,
246 * since we don't support any...
247 */
248 if (gnvh->critical) {
249 DEV_STATS_INC(geneve->dev, rx_frame_errors);
250 DEV_STATS_INC(geneve->dev, rx_errors);
251 goto drop;
252 }
253 }
254
255 if (tun_dst)
256 skb_dst_set(skb, &tun_dst->dst);
257
258 if (gnvh->proto_type == htons(ETH_P_TEB)) {
259 skb_reset_mac_header(skb);
260 skb->protocol = eth_type_trans(skb, geneve->dev);
261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
262
263 /* Ignore packet loops (and multicast echo) */
264 if (ether_addr_equal(eth_hdr(skb)->h_source,
265 geneve->dev->dev_addr)) {
266 DEV_STATS_INC(geneve->dev, rx_errors);
267 goto drop;
268 }
269 } else {
270 skb_reset_mac_header(skb);
271 skb->dev = geneve->dev;
272 skb->pkt_type = PACKET_HOST;
273 }
274
275 /* Save offset of outer header relative to skb->head,
276 * because we are going to reset the network header to the inner header
277 * and might change skb->head.
278 */
279 nh = skb_network_header(skb) - skb->head;
280
281 skb_reset_network_header(skb);
282
283 if (!pskb_inet_may_pull(skb)) {
284 DEV_STATS_INC(geneve->dev, rx_length_errors);
285 DEV_STATS_INC(geneve->dev, rx_errors);
286 goto drop;
287 }
288
289 /* Get the outer header. */
290 oiph = skb->head + nh;
291
292 if (geneve_get_sk_family(gs) == AF_INET)
293 err = IP_ECN_decapsulate(oiph, skb);
294#if IS_ENABLED(CONFIG_IPV6)
295 else
296 err = IP6_ECN_decapsulate(oiph, skb);
297#endif
298
299 if (unlikely(err)) {
300 if (log_ecn_error) {
301 if (geneve_get_sk_family(gs) == AF_INET)
302 net_info_ratelimited("non-ECT from %pI4 "
303 "with TOS=%#x\n",
304 &((struct iphdr *)oiph)->saddr,
305 ((struct iphdr *)oiph)->tos);
306#if IS_ENABLED(CONFIG_IPV6)
307 else
308 net_info_ratelimited("non-ECT from %pI6\n",
309 &((struct ipv6hdr *)oiph)->saddr);
310#endif
311 }
312 if (err > 1) {
313 DEV_STATS_INC(geneve->dev, rx_frame_errors);
314 DEV_STATS_INC(geneve->dev, rx_errors);
315 goto drop;
316 }
317 }
318
319 len = skb->len;
320 err = gro_cells_receive(&geneve->gro_cells, skb);
321 if (likely(err == NET_RX_SUCCESS))
322 dev_sw_netstats_rx_add(geneve->dev, len);
323
324 return;
325drop:
326 /* Consume bad packet */
327 kfree_skb(skb);
328}
329
330/* Setup stats when device is created */
331static int geneve_init(struct net_device *dev)
332{
333 struct geneve_dev *geneve = netdev_priv(dev);
334 int err;
335
336 err = gro_cells_init(&geneve->gro_cells, dev);
337 if (err)
338 return err;
339
340 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
341 if (err) {
342 gro_cells_destroy(&geneve->gro_cells);
343 return err;
344 }
345 netdev_lockdep_set_classes(dev);
346 return 0;
347}
348
349static void geneve_uninit(struct net_device *dev)
350{
351 struct geneve_dev *geneve = netdev_priv(dev);
352
353 dst_cache_destroy(&geneve->cfg.info.dst_cache);
354 gro_cells_destroy(&geneve->gro_cells);
355}
356
357/* Callback from net/ipv4/udp.c to receive packets */
358static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
359{
360 struct genevehdr *geneveh;
361 struct geneve_dev *geneve;
362 struct geneve_sock *gs;
363 __be16 inner_proto;
364 int opts_len;
365
366 /* Need UDP and Geneve header to be present */
367 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
368 goto drop;
369
370 /* Return packets with reserved bits set */
371 geneveh = geneve_hdr(skb);
372 if (unlikely(geneveh->ver != GENEVE_VER))
373 goto drop;
374
375 gs = rcu_dereference_sk_user_data(sk);
376 if (!gs)
377 goto drop;
378
379 geneve = geneve_lookup_skb(gs, skb);
380 if (!geneve)
381 goto drop;
382
383 inner_proto = geneveh->proto_type;
384
385 if (unlikely((!geneve->cfg.inner_proto_inherit &&
386 inner_proto != htons(ETH_P_TEB)))) {
387 DEV_STATS_INC(geneve->dev, rx_dropped);
388 goto drop;
389 }
390
391 opts_len = geneveh->opt_len * 4;
392 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
393 !net_eq(geneve->net, dev_net(geneve->dev)))) {
394 DEV_STATS_INC(geneve->dev, rx_dropped);
395 goto drop;
396 }
397
398 geneve_rx(geneve, gs, skb);
399 return 0;
400
401drop:
402 /* Consume bad packet */
403 kfree_skb(skb);
404 return 0;
405}
406
407/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
408static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
409{
410 struct genevehdr *geneveh;
411 struct geneve_sock *gs;
412 u8 zero_vni[3] = { 0 };
413 u8 *vni = zero_vni;
414
415 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
416 return -EINVAL;
417
418 geneveh = geneve_hdr(skb);
419 if (geneveh->ver != GENEVE_VER)
420 return -EINVAL;
421
422 if (geneveh->proto_type != htons(ETH_P_TEB))
423 return -EINVAL;
424
425 gs = rcu_dereference_sk_user_data(sk);
426 if (!gs)
427 return -ENOENT;
428
429 if (geneve_get_sk_family(gs) == AF_INET) {
430 struct iphdr *iph = ip_hdr(skb);
431 __be32 addr4 = 0;
432
433 if (!gs->collect_md) {
434 vni = geneve_hdr(skb)->vni;
435 addr4 = iph->daddr;
436 }
437
438 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
439 }
440
441#if IS_ENABLED(CONFIG_IPV6)
442 if (geneve_get_sk_family(gs) == AF_INET6) {
443 struct ipv6hdr *ip6h = ipv6_hdr(skb);
444 struct in6_addr addr6;
445
446 memset(&addr6, 0, sizeof(struct in6_addr));
447
448 if (!gs->collect_md) {
449 vni = geneve_hdr(skb)->vni;
450 addr6 = ip6h->daddr;
451 }
452
453 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
454 }
455#endif
456
457 return -EPFNOSUPPORT;
458}
459
460static struct socket *geneve_create_sock(struct net *net, bool ipv6,
461 __be16 port, bool ipv6_rx_csum)
462{
463 struct socket *sock;
464 struct udp_port_cfg udp_conf;
465 int err;
466
467 memset(&udp_conf, 0, sizeof(udp_conf));
468
469 if (ipv6) {
470 udp_conf.family = AF_INET6;
471 udp_conf.ipv6_v6only = 1;
472 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
473 } else {
474 udp_conf.family = AF_INET;
475 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
476 }
477
478 udp_conf.local_udp_port = port;
479
480 /* Open UDP socket */
481 err = udp_sock_create(net, &udp_conf, &sock);
482 if (err < 0)
483 return ERR_PTR(err);
484
485 udp_allow_gso(sock->sk);
486 return sock;
487}
488
489static int geneve_hlen(struct genevehdr *gh)
490{
491 return sizeof(*gh) + gh->opt_len * 4;
492}
493
494static struct sk_buff *geneve_gro_receive(struct sock *sk,
495 struct list_head *head,
496 struct sk_buff *skb)
497{
498 struct sk_buff *pp = NULL;
499 struct sk_buff *p;
500 struct genevehdr *gh, *gh2;
501 unsigned int hlen, gh_len, off_gnv;
502 const struct packet_offload *ptype;
503 __be16 type;
504 int flush = 1;
505
506 off_gnv = skb_gro_offset(skb);
507 hlen = off_gnv + sizeof(*gh);
508 gh = skb_gro_header(skb, hlen, off_gnv);
509 if (unlikely(!gh))
510 goto out;
511
512 if (gh->ver != GENEVE_VER || gh->oam)
513 goto out;
514 gh_len = geneve_hlen(gh);
515
516 hlen = off_gnv + gh_len;
517 if (!skb_gro_may_pull(skb, hlen)) {
518 gh = skb_gro_header_slow(skb, hlen, off_gnv);
519 if (unlikely(!gh))
520 goto out;
521 }
522
523 list_for_each_entry(p, head, list) {
524 if (!NAPI_GRO_CB(p)->same_flow)
525 continue;
526
527 gh2 = (struct genevehdr *)(p->data + off_gnv);
528 if (gh->opt_len != gh2->opt_len ||
529 memcmp(gh, gh2, gh_len)) {
530 NAPI_GRO_CB(p)->same_flow = 0;
531 continue;
532 }
533 }
534
535 skb_gro_pull(skb, gh_len);
536 skb_gro_postpull_rcsum(skb, gh, gh_len);
537 type = gh->proto_type;
538 if (likely(type == htons(ETH_P_TEB)))
539 return call_gro_receive(eth_gro_receive, head, skb);
540
541 ptype = gro_find_receive_by_type(type);
542 if (!ptype)
543 goto out;
544
545 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
546 flush = 0;
547
548out:
549 skb_gro_flush_final(skb, pp, flush);
550
551 return pp;
552}
553
554static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
555 int nhoff)
556{
557 struct genevehdr *gh;
558 struct packet_offload *ptype;
559 __be16 type;
560 int gh_len;
561 int err = -ENOSYS;
562
563 gh = (struct genevehdr *)(skb->data + nhoff);
564 gh_len = geneve_hlen(gh);
565 type = gh->proto_type;
566
567 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
568 if (likely(type == htons(ETH_P_TEB)))
569 return eth_gro_complete(skb, nhoff + gh_len);
570
571 ptype = gro_find_complete_by_type(type);
572 if (ptype)
573 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
574
575 skb_set_inner_mac_header(skb, nhoff + gh_len);
576
577 return err;
578}
579
580/* Create new listen socket if needed */
581static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
582 bool ipv6, bool ipv6_rx_csum)
583{
584 struct geneve_net *gn = net_generic(net, geneve_net_id);
585 struct geneve_sock *gs;
586 struct socket *sock;
587 struct udp_tunnel_sock_cfg tunnel_cfg;
588 int h;
589
590 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
591 if (!gs)
592 return ERR_PTR(-ENOMEM);
593
594 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
595 if (IS_ERR(sock)) {
596 kfree(gs);
597 return ERR_CAST(sock);
598 }
599
600 gs->sock = sock;
601 gs->refcnt = 1;
602 for (h = 0; h < VNI_HASH_SIZE; ++h)
603 INIT_HLIST_HEAD(&gs->vni_list[h]);
604
605 /* Initialize the geneve udp offloads structure */
606 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
607
608 /* Mark socket as an encapsulation socket */
609 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
610 tunnel_cfg.sk_user_data = gs;
611 tunnel_cfg.encap_type = 1;
612 tunnel_cfg.gro_receive = geneve_gro_receive;
613 tunnel_cfg.gro_complete = geneve_gro_complete;
614 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
615 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
616 tunnel_cfg.encap_destroy = NULL;
617 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
618 list_add(&gs->list, &gn->sock_list);
619 return gs;
620}
621
622static void __geneve_sock_release(struct geneve_sock *gs)
623{
624 if (!gs || --gs->refcnt)
625 return;
626
627 list_del(&gs->list);
628 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
629 udp_tunnel_sock_release(gs->sock);
630 kfree_rcu(gs, rcu);
631}
632
633static void geneve_sock_release(struct geneve_dev *geneve)
634{
635 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
636#if IS_ENABLED(CONFIG_IPV6)
637 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
638
639 rcu_assign_pointer(geneve->sock6, NULL);
640#endif
641
642 rcu_assign_pointer(geneve->sock4, NULL);
643 synchronize_net();
644
645 __geneve_sock_release(gs4);
646#if IS_ENABLED(CONFIG_IPV6)
647 __geneve_sock_release(gs6);
648#endif
649}
650
651static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
652 sa_family_t family,
653 __be16 dst_port)
654{
655 struct geneve_sock *gs;
656
657 list_for_each_entry(gs, &gn->sock_list, list) {
658 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
659 geneve_get_sk_family(gs) == family) {
660 return gs;
661 }
662 }
663 return NULL;
664}
665
666static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
667{
668 struct net *net = geneve->net;
669 struct geneve_net *gn = net_generic(net, geneve_net_id);
670 struct geneve_dev_node *node;
671 struct geneve_sock *gs;
672 __u8 vni[3];
673 __u32 hash;
674
675 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
676 if (gs) {
677 gs->refcnt++;
678 goto out;
679 }
680
681 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
682 geneve->cfg.use_udp6_rx_checksums);
683 if (IS_ERR(gs))
684 return PTR_ERR(gs);
685
686out:
687 gs->collect_md = geneve->cfg.collect_md;
688#if IS_ENABLED(CONFIG_IPV6)
689 if (ipv6) {
690 rcu_assign_pointer(geneve->sock6, gs);
691 node = &geneve->hlist6;
692 } else
693#endif
694 {
695 rcu_assign_pointer(geneve->sock4, gs);
696 node = &geneve->hlist4;
697 }
698 node->geneve = geneve;
699
700 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
701 hash = geneve_net_vni_hash(vni);
702 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
703 return 0;
704}
705
706static int geneve_open(struct net_device *dev)
707{
708 struct geneve_dev *geneve = netdev_priv(dev);
709 bool metadata = geneve->cfg.collect_md;
710 bool ipv4, ipv6;
711 int ret = 0;
712
713 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
714 ipv4 = !ipv6 || metadata;
715#if IS_ENABLED(CONFIG_IPV6)
716 if (ipv6) {
717 ret = geneve_sock_add(geneve, true);
718 if (ret < 0 && ret != -EAFNOSUPPORT)
719 ipv4 = false;
720 }
721#endif
722 if (ipv4)
723 ret = geneve_sock_add(geneve, false);
724 if (ret < 0)
725 geneve_sock_release(geneve);
726
727 return ret;
728}
729
730static int geneve_stop(struct net_device *dev)
731{
732 struct geneve_dev *geneve = netdev_priv(dev);
733
734 hlist_del_init_rcu(&geneve->hlist4.hlist);
735#if IS_ENABLED(CONFIG_IPV6)
736 hlist_del_init_rcu(&geneve->hlist6.hlist);
737#endif
738 geneve_sock_release(geneve);
739 return 0;
740}
741
742static void geneve_build_header(struct genevehdr *geneveh,
743 const struct ip_tunnel_info *info,
744 __be16 inner_proto)
745{
746 geneveh->ver = GENEVE_VER;
747 geneveh->opt_len = info->options_len / 4;
748 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
749 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
750 geneveh->rsvd1 = 0;
751 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
752 geneveh->proto_type = inner_proto;
753 geneveh->rsvd2 = 0;
754
755 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
756 ip_tunnel_info_opts_get(geneveh->options, info);
757}
758
759static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
760 const struct ip_tunnel_info *info,
761 bool xnet, int ip_hdr_len,
762 bool inner_proto_inherit)
763{
764 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
765 struct genevehdr *gnvh;
766 __be16 inner_proto;
767 int min_headroom;
768 int err;
769
770 skb_reset_mac_header(skb);
771 skb_scrub_packet(skb, xnet);
772
773 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
774 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
775 err = skb_cow_head(skb, min_headroom);
776 if (unlikely(err))
777 goto free_dst;
778
779 err = udp_tunnel_handle_offloads(skb, udp_sum);
780 if (err)
781 goto free_dst;
782
783 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
784 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
785 geneve_build_header(gnvh, info, inner_proto);
786 skb_set_inner_protocol(skb, inner_proto);
787 return 0;
788
789free_dst:
790 dst_release(dst);
791 return err;
792}
793
794static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
795 const struct ip_tunnel_info *info,
796 bool *use_cache)
797{
798 struct geneve_dev *geneve = netdev_priv(dev);
799 u8 dsfield;
800
801 dsfield = info->key.tos;
802 if (dsfield == 1 && !geneve->cfg.collect_md) {
803 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
804 *use_cache = false;
805 }
806
807 return dsfield;
808}
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 bool use_cache;
819 __u8 tos, ttl;
820 __be16 df = 0;
821 __be32 saddr;
822 __be16 sport;
823 int err;
824
825 if (!skb_vlan_inet_prepare(skb))
826 return -EINVAL;
827
828 if (!gs4)
829 return -EIO;
830
831 use_cache = ip_tunnel_dst_cache_usable(skb, info);
832 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
833 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
834
835 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
836 &info->key,
837 sport, geneve->cfg.info.key.tp_dst, tos,
838 use_cache ?
839 (struct dst_cache *)&info->dst_cache : NULL);
840 if (IS_ERR(rt))
841 return PTR_ERR(rt);
842
843 err = skb_tunnel_check_pmtu(skb, &rt->dst,
844 GENEVE_IPV4_HLEN + info->options_len,
845 netif_is_any_bridge_port(dev));
846 if (err < 0) {
847 dst_release(&rt->dst);
848 return err;
849 } else if (err) {
850 struct ip_tunnel_info *info;
851
852 info = skb_tunnel_info(skb);
853 if (info) {
854 struct ip_tunnel_info *unclone;
855
856 unclone = skb_tunnel_info_unclone(skb);
857 if (unlikely(!unclone)) {
858 dst_release(&rt->dst);
859 return -ENOMEM;
860 }
861
862 unclone->key.u.ipv4.dst = saddr;
863 unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
864 }
865
866 if (!pskb_may_pull(skb, ETH_HLEN)) {
867 dst_release(&rt->dst);
868 return -EINVAL;
869 }
870
871 skb->protocol = eth_type_trans(skb, geneve->dev);
872 __netif_rx(skb);
873 dst_release(&rt->dst);
874 return -EMSGSIZE;
875 }
876
877 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
878 if (geneve->cfg.collect_md) {
879 ttl = key->ttl;
880
881 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
882 } else {
883 if (geneve->cfg.ttl_inherit)
884 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
885 else
886 ttl = key->ttl;
887 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
888
889 if (geneve->cfg.df == GENEVE_DF_SET) {
890 df = htons(IP_DF);
891 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
892 struct ethhdr *eth = eth_hdr(skb);
893
894 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
895 df = htons(IP_DF);
896 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
897 struct iphdr *iph = ip_hdr(skb);
898
899 if (iph->frag_off & htons(IP_DF))
900 df = htons(IP_DF);
901 }
902 }
903 }
904
905 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
906 geneve->cfg.inner_proto_inherit);
907 if (unlikely(err))
908 return err;
909
910 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
911 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
912 !net_eq(geneve->net, dev_net(geneve->dev)),
913 !(info->key.tun_flags & TUNNEL_CSUM));
914 return 0;
915}
916
917#if IS_ENABLED(CONFIG_IPV6)
918static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
919 struct geneve_dev *geneve,
920 const struct ip_tunnel_info *info)
921{
922 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
923 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
924 const struct ip_tunnel_key *key = &info->key;
925 struct dst_entry *dst = NULL;
926 struct in6_addr saddr;
927 bool use_cache;
928 __u8 prio, ttl;
929 __be16 sport;
930 int err;
931
932 if (!skb_vlan_inet_prepare(skb))
933 return -EINVAL;
934
935 if (!gs6)
936 return -EIO;
937
938 use_cache = ip_tunnel_dst_cache_usable(skb, info);
939 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
940 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
941
942 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
943 &saddr, key, sport,
944 geneve->cfg.info.key.tp_dst, prio,
945 use_cache ?
946 (struct dst_cache *)&info->dst_cache : NULL);
947 if (IS_ERR(dst))
948 return PTR_ERR(dst);
949
950 err = skb_tunnel_check_pmtu(skb, dst,
951 GENEVE_IPV6_HLEN + info->options_len,
952 netif_is_any_bridge_port(dev));
953 if (err < 0) {
954 dst_release(dst);
955 return err;
956 } else if (err) {
957 struct ip_tunnel_info *info = skb_tunnel_info(skb);
958
959 if (info) {
960 struct ip_tunnel_info *unclone;
961
962 unclone = skb_tunnel_info_unclone(skb);
963 if (unlikely(!unclone)) {
964 dst_release(dst);
965 return -ENOMEM;
966 }
967
968 unclone->key.u.ipv6.dst = saddr;
969 unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
970 }
971
972 if (!pskb_may_pull(skb, ETH_HLEN)) {
973 dst_release(dst);
974 return -EINVAL;
975 }
976
977 skb->protocol = eth_type_trans(skb, geneve->dev);
978 __netif_rx(skb);
979 dst_release(dst);
980 return -EMSGSIZE;
981 }
982
983 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
984 if (geneve->cfg.collect_md) {
985 ttl = key->ttl;
986 } else {
987 if (geneve->cfg.ttl_inherit)
988 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
989 else
990 ttl = key->ttl;
991 ttl = ttl ? : ip6_dst_hoplimit(dst);
992 }
993 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
994 geneve->cfg.inner_proto_inherit);
995 if (unlikely(err))
996 return err;
997
998 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
999 &saddr, &key->u.ipv6.dst, prio, ttl,
1000 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1001 !(info->key.tun_flags & TUNNEL_CSUM));
1002 return 0;
1003}
1004#endif
1005
1006static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1007{
1008 struct geneve_dev *geneve = netdev_priv(dev);
1009 struct ip_tunnel_info *info = NULL;
1010 int err;
1011
1012 if (geneve->cfg.collect_md) {
1013 info = skb_tunnel_info(skb);
1014 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1015 netdev_dbg(dev, "no tunnel metadata\n");
1016 dev_kfree_skb(skb);
1017 DEV_STATS_INC(dev, tx_dropped);
1018 return NETDEV_TX_OK;
1019 }
1020 } else {
1021 info = &geneve->cfg.info;
1022 }
1023
1024 rcu_read_lock();
1025#if IS_ENABLED(CONFIG_IPV6)
1026 if (info->mode & IP_TUNNEL_INFO_IPV6)
1027 err = geneve6_xmit_skb(skb, dev, geneve, info);
1028 else
1029#endif
1030 err = geneve_xmit_skb(skb, dev, geneve, info);
1031 rcu_read_unlock();
1032
1033 if (likely(!err))
1034 return NETDEV_TX_OK;
1035
1036 if (err != -EMSGSIZE)
1037 dev_kfree_skb(skb);
1038
1039 if (err == -ELOOP)
1040 DEV_STATS_INC(dev, collisions);
1041 else if (err == -ENETUNREACH)
1042 DEV_STATS_INC(dev, tx_carrier_errors);
1043
1044 DEV_STATS_INC(dev, tx_errors);
1045 return NETDEV_TX_OK;
1046}
1047
1048static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1049{
1050 if (new_mtu > dev->max_mtu)
1051 new_mtu = dev->max_mtu;
1052 else if (new_mtu < dev->min_mtu)
1053 new_mtu = dev->min_mtu;
1054
1055 dev->mtu = new_mtu;
1056 return 0;
1057}
1058
1059static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1060{
1061 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1062 struct geneve_dev *geneve = netdev_priv(dev);
1063 __be16 sport;
1064
1065 if (ip_tunnel_info_af(info) == AF_INET) {
1066 struct rtable *rt;
1067 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1068 bool use_cache;
1069 __be32 saddr;
1070 u8 tos;
1071
1072 if (!gs4)
1073 return -EIO;
1074
1075 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1076 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1077 sport = udp_flow_src_port(geneve->net, skb,
1078 1, USHRT_MAX, true);
1079
1080 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1081 &info->key,
1082 sport, geneve->cfg.info.key.tp_dst,
1083 tos,
1084 use_cache ? &info->dst_cache : NULL);
1085 if (IS_ERR(rt))
1086 return PTR_ERR(rt);
1087
1088 ip_rt_put(rt);
1089 info->key.u.ipv4.src = saddr;
1090#if IS_ENABLED(CONFIG_IPV6)
1091 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1092 struct dst_entry *dst;
1093 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1094 struct in6_addr saddr;
1095 bool use_cache;
1096 u8 prio;
1097
1098 if (!gs6)
1099 return -EIO;
1100
1101 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1102 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1103 sport = udp_flow_src_port(geneve->net, skb,
1104 1, USHRT_MAX, true);
1105
1106 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1107 &saddr, &info->key, sport,
1108 geneve->cfg.info.key.tp_dst, prio,
1109 use_cache ? &info->dst_cache : NULL);
1110 if (IS_ERR(dst))
1111 return PTR_ERR(dst);
1112
1113 dst_release(dst);
1114 info->key.u.ipv6.src = saddr;
1115#endif
1116 } else {
1117 return -EINVAL;
1118 }
1119
1120 info->key.tp_src = sport;
1121 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1122 return 0;
1123}
1124
1125static const struct net_device_ops geneve_netdev_ops = {
1126 .ndo_init = geneve_init,
1127 .ndo_uninit = geneve_uninit,
1128 .ndo_open = geneve_open,
1129 .ndo_stop = geneve_stop,
1130 .ndo_start_xmit = geneve_xmit,
1131 .ndo_change_mtu = geneve_change_mtu,
1132 .ndo_validate_addr = eth_validate_addr,
1133 .ndo_set_mac_address = eth_mac_addr,
1134 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1135};
1136
1137static void geneve_get_drvinfo(struct net_device *dev,
1138 struct ethtool_drvinfo *drvinfo)
1139{
1140 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1141 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1142}
1143
1144static const struct ethtool_ops geneve_ethtool_ops = {
1145 .get_drvinfo = geneve_get_drvinfo,
1146 .get_link = ethtool_op_get_link,
1147};
1148
1149/* Info for udev, that this is a virtual tunnel endpoint */
1150static const struct device_type geneve_type = {
1151 .name = "geneve",
1152};
1153
1154/* Calls the ndo_udp_tunnel_add of the caller in order to
1155 * supply the listening GENEVE udp ports. Callers are expected
1156 * to implement the ndo_udp_tunnel_add.
1157 */
1158static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1159{
1160 struct net *net = dev_net(dev);
1161 struct geneve_net *gn = net_generic(net, geneve_net_id);
1162 struct geneve_sock *gs;
1163
1164 rcu_read_lock();
1165 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1166 if (push) {
1167 udp_tunnel_push_rx_port(dev, gs->sock,
1168 UDP_TUNNEL_TYPE_GENEVE);
1169 } else {
1170 udp_tunnel_drop_rx_port(dev, gs->sock,
1171 UDP_TUNNEL_TYPE_GENEVE);
1172 }
1173 }
1174 rcu_read_unlock();
1175}
1176
1177/* Initialize the device structure. */
1178static void geneve_setup(struct net_device *dev)
1179{
1180 ether_setup(dev);
1181
1182 dev->netdev_ops = &geneve_netdev_ops;
1183 dev->ethtool_ops = &geneve_ethtool_ops;
1184 dev->needs_free_netdev = true;
1185
1186 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1187
1188 dev->features |= NETIF_F_LLTX;
1189 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1190 dev->features |= NETIF_F_RXCSUM;
1191 dev->features |= NETIF_F_GSO_SOFTWARE;
1192
1193 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1194 dev->hw_features |= NETIF_F_RXCSUM;
1195 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1196
1197 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1198 /* MTU range: 68 - (something less than 65535) */
1199 dev->min_mtu = ETH_MIN_MTU;
1200 /* The max_mtu calculation does not take account of GENEVE
1201 * options, to avoid excluding potentially valid
1202 * configurations. This will be further reduced by IPvX hdr size.
1203 */
1204 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1205
1206 netif_keep_dst(dev);
1207 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1208 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1209 eth_hw_addr_random(dev);
1210}
1211
1212static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1213 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1214 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1215 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1216 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1217 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1218 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1219 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1220 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1221 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1222 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1223 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1224 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1225 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1226 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1227 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG },
1228};
1229
1230static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1231 struct netlink_ext_ack *extack)
1232{
1233 if (tb[IFLA_ADDRESS]) {
1234 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1235 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1236 "Provided link layer address is not Ethernet");
1237 return -EINVAL;
1238 }
1239
1240 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1241 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1242 "Provided Ethernet address is not unicast");
1243 return -EADDRNOTAVAIL;
1244 }
1245 }
1246
1247 if (!data) {
1248 NL_SET_ERR_MSG(extack,
1249 "Not enough attributes provided to perform the operation");
1250 return -EINVAL;
1251 }
1252
1253 if (data[IFLA_GENEVE_ID]) {
1254 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1255
1256 if (vni >= GENEVE_N_VID) {
1257 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1258 "Geneve ID must be lower than 16777216");
1259 return -ERANGE;
1260 }
1261 }
1262
1263 if (data[IFLA_GENEVE_DF]) {
1264 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1265
1266 if (df < 0 || df > GENEVE_DF_MAX) {
1267 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1268 "Invalid DF attribute");
1269 return -EINVAL;
1270 }
1271 }
1272
1273 return 0;
1274}
1275
1276static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1277 const struct ip_tunnel_info *info,
1278 bool *tun_on_same_port,
1279 bool *tun_collect_md)
1280{
1281 struct geneve_dev *geneve, *t = NULL;
1282
1283 *tun_on_same_port = false;
1284 *tun_collect_md = false;
1285 list_for_each_entry(geneve, &gn->geneve_list, next) {
1286 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1287 *tun_collect_md = geneve->cfg.collect_md;
1288 *tun_on_same_port = true;
1289 }
1290 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1291 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1292 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1293 t = geneve;
1294 }
1295 return t;
1296}
1297
1298static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1299{
1300 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1301 info->key.ttl || info->key.label || info->key.tp_src ||
1302 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1303}
1304
1305static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1306 struct ip_tunnel_info *b)
1307{
1308 if (ip_tunnel_info_af(a) == AF_INET)
1309 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1310 else
1311 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1312}
1313
1314static int geneve_configure(struct net *net, struct net_device *dev,
1315 struct netlink_ext_ack *extack,
1316 const struct geneve_config *cfg)
1317{
1318 struct geneve_net *gn = net_generic(net, geneve_net_id);
1319 struct geneve_dev *t, *geneve = netdev_priv(dev);
1320 const struct ip_tunnel_info *info = &cfg->info;
1321 bool tun_collect_md, tun_on_same_port;
1322 int err, encap_len;
1323
1324 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1325 NL_SET_ERR_MSG(extack,
1326 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1327 return -EINVAL;
1328 }
1329
1330 geneve->net = net;
1331 geneve->dev = dev;
1332
1333 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1334 if (t)
1335 return -EBUSY;
1336
1337 /* make enough headroom for basic scenario */
1338 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1339 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1340 encap_len += sizeof(struct iphdr);
1341 dev->max_mtu -= sizeof(struct iphdr);
1342 } else {
1343 encap_len += sizeof(struct ipv6hdr);
1344 dev->max_mtu -= sizeof(struct ipv6hdr);
1345 }
1346 dev->needed_headroom = encap_len + ETH_HLEN;
1347
1348 if (cfg->collect_md) {
1349 if (tun_on_same_port) {
1350 NL_SET_ERR_MSG(extack,
1351 "There can be only one externally controlled device on a destination port");
1352 return -EPERM;
1353 }
1354 } else {
1355 if (tun_collect_md) {
1356 NL_SET_ERR_MSG(extack,
1357 "There already exists an externally controlled device on this destination port");
1358 return -EPERM;
1359 }
1360 }
1361
1362 dst_cache_reset(&geneve->cfg.info.dst_cache);
1363 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1364
1365 if (geneve->cfg.inner_proto_inherit) {
1366 dev->header_ops = NULL;
1367 dev->type = ARPHRD_NONE;
1368 dev->hard_header_len = 0;
1369 dev->addr_len = 0;
1370 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1371 }
1372
1373 err = register_netdevice(dev);
1374 if (err)
1375 return err;
1376
1377 list_add(&geneve->next, &gn->geneve_list);
1378 return 0;
1379}
1380
1381static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1382{
1383 memset(info, 0, sizeof(*info));
1384 info->key.tp_dst = htons(dst_port);
1385}
1386
1387static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1388 struct netlink_ext_ack *extack,
1389 struct geneve_config *cfg, bool changelink)
1390{
1391 struct ip_tunnel_info *info = &cfg->info;
1392 int attrtype;
1393
1394 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1395 NL_SET_ERR_MSG(extack,
1396 "Cannot specify both IPv4 and IPv6 Remote addresses");
1397 return -EINVAL;
1398 }
1399
1400 if (data[IFLA_GENEVE_REMOTE]) {
1401 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1402 attrtype = IFLA_GENEVE_REMOTE;
1403 goto change_notsup;
1404 }
1405
1406 info->key.u.ipv4.dst =
1407 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1408
1409 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1410 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1411 "Remote IPv4 address cannot be Multicast");
1412 return -EINVAL;
1413 }
1414 }
1415
1416 if (data[IFLA_GENEVE_REMOTE6]) {
1417#if IS_ENABLED(CONFIG_IPV6)
1418 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1419 attrtype = IFLA_GENEVE_REMOTE6;
1420 goto change_notsup;
1421 }
1422
1423 info->mode = IP_TUNNEL_INFO_IPV6;
1424 info->key.u.ipv6.dst =
1425 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1426
1427 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1428 IPV6_ADDR_LINKLOCAL) {
1429 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1430 "Remote IPv6 address cannot be link-local");
1431 return -EINVAL;
1432 }
1433 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1434 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1435 "Remote IPv6 address cannot be Multicast");
1436 return -EINVAL;
1437 }
1438 info->key.tun_flags |= TUNNEL_CSUM;
1439 cfg->use_udp6_rx_checksums = true;
1440#else
1441 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1442 "IPv6 support not enabled in the kernel");
1443 return -EPFNOSUPPORT;
1444#endif
1445 }
1446
1447 if (data[IFLA_GENEVE_ID]) {
1448 __u32 vni;
1449 __u8 tvni[3];
1450 __be64 tunid;
1451
1452 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1453 tvni[0] = (vni & 0x00ff0000) >> 16;
1454 tvni[1] = (vni & 0x0000ff00) >> 8;
1455 tvni[2] = vni & 0x000000ff;
1456
1457 tunid = vni_to_tunnel_id(tvni);
1458 if (changelink && (tunid != info->key.tun_id)) {
1459 attrtype = IFLA_GENEVE_ID;
1460 goto change_notsup;
1461 }
1462 info->key.tun_id = tunid;
1463 }
1464
1465 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1466 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1467 cfg->ttl_inherit = true;
1468 else
1469 cfg->ttl_inherit = false;
1470 } else if (data[IFLA_GENEVE_TTL]) {
1471 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1472 cfg->ttl_inherit = false;
1473 }
1474
1475 if (data[IFLA_GENEVE_TOS])
1476 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1477
1478 if (data[IFLA_GENEVE_DF])
1479 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1480
1481 if (data[IFLA_GENEVE_LABEL]) {
1482 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1483 IPV6_FLOWLABEL_MASK;
1484 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1485 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1486 "Label attribute only applies for IPv6 Geneve devices");
1487 return -EINVAL;
1488 }
1489 }
1490
1491 if (data[IFLA_GENEVE_PORT]) {
1492 if (changelink) {
1493 attrtype = IFLA_GENEVE_PORT;
1494 goto change_notsup;
1495 }
1496 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1497 }
1498
1499 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1500 if (changelink) {
1501 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1502 goto change_notsup;
1503 }
1504 cfg->collect_md = true;
1505 }
1506
1507 if (data[IFLA_GENEVE_UDP_CSUM]) {
1508 if (changelink) {
1509 attrtype = IFLA_GENEVE_UDP_CSUM;
1510 goto change_notsup;
1511 }
1512 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1513 info->key.tun_flags |= TUNNEL_CSUM;
1514 }
1515
1516 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1517#if IS_ENABLED(CONFIG_IPV6)
1518 if (changelink) {
1519 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1520 goto change_notsup;
1521 }
1522 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1523 info->key.tun_flags &= ~TUNNEL_CSUM;
1524#else
1525 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1526 "IPv6 support not enabled in the kernel");
1527 return -EPFNOSUPPORT;
1528#endif
1529 }
1530
1531 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1532#if IS_ENABLED(CONFIG_IPV6)
1533 if (changelink) {
1534 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1535 goto change_notsup;
1536 }
1537 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1538 cfg->use_udp6_rx_checksums = false;
1539#else
1540 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1541 "IPv6 support not enabled in the kernel");
1542 return -EPFNOSUPPORT;
1543#endif
1544 }
1545
1546 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1547 if (changelink) {
1548 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1549 goto change_notsup;
1550 }
1551 cfg->inner_proto_inherit = true;
1552 }
1553
1554 return 0;
1555change_notsup:
1556 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1557 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1558 return -EOPNOTSUPP;
1559}
1560
1561static void geneve_link_config(struct net_device *dev,
1562 struct ip_tunnel_info *info, struct nlattr *tb[])
1563{
1564 struct geneve_dev *geneve = netdev_priv(dev);
1565 int ldev_mtu = 0;
1566
1567 if (tb[IFLA_MTU]) {
1568 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1569 return;
1570 }
1571
1572 switch (ip_tunnel_info_af(info)) {
1573 case AF_INET: {
1574 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1575 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1576
1577 if (!IS_ERR(rt) && rt->dst.dev) {
1578 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1579 ip_rt_put(rt);
1580 }
1581 break;
1582 }
1583#if IS_ENABLED(CONFIG_IPV6)
1584 case AF_INET6: {
1585 struct rt6_info *rt;
1586
1587 if (!__in6_dev_get(dev))
1588 break;
1589
1590 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1591 NULL, 0);
1592
1593 if (rt && rt->dst.dev)
1594 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1595 ip6_rt_put(rt);
1596 break;
1597 }
1598#endif
1599 }
1600
1601 if (ldev_mtu <= 0)
1602 return;
1603
1604 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1605}
1606
1607static int geneve_newlink(struct net *net, struct net_device *dev,
1608 struct nlattr *tb[], struct nlattr *data[],
1609 struct netlink_ext_ack *extack)
1610{
1611 struct geneve_config cfg = {
1612 .df = GENEVE_DF_UNSET,
1613 .use_udp6_rx_checksums = false,
1614 .ttl_inherit = false,
1615 .collect_md = false,
1616 };
1617 int err;
1618
1619 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1620 err = geneve_nl2info(tb, data, extack, &cfg, false);
1621 if (err)
1622 return err;
1623
1624 err = geneve_configure(net, dev, extack, &cfg);
1625 if (err)
1626 return err;
1627
1628 geneve_link_config(dev, &cfg.info, tb);
1629
1630 return 0;
1631}
1632
1633/* Quiesces the geneve device data path for both TX and RX.
1634 *
1635 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1636 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1637 * to complete for the existing set of in-flight packets to be transmitted,
1638 * then we would have quiesced the transmit data path. All the future packets
1639 * will get dropped until we unquiesce the data path.
1640 *
1641 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1642 * if we set that to NULL under RCU and wait for synchronize_net() to
1643 * complete, then we would have quiesced the receive data path.
1644 */
1645static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1646 struct geneve_sock **gs6)
1647{
1648 *gs4 = rtnl_dereference(geneve->sock4);
1649 rcu_assign_pointer(geneve->sock4, NULL);
1650 if (*gs4)
1651 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1652#if IS_ENABLED(CONFIG_IPV6)
1653 *gs6 = rtnl_dereference(geneve->sock6);
1654 rcu_assign_pointer(geneve->sock6, NULL);
1655 if (*gs6)
1656 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1657#else
1658 *gs6 = NULL;
1659#endif
1660 synchronize_net();
1661}
1662
1663/* Resumes the geneve device data path for both TX and RX. */
1664static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1665 struct geneve_sock __maybe_unused *gs6)
1666{
1667 rcu_assign_pointer(geneve->sock4, gs4);
1668 if (gs4)
1669 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1670#if IS_ENABLED(CONFIG_IPV6)
1671 rcu_assign_pointer(geneve->sock6, gs6);
1672 if (gs6)
1673 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1674#endif
1675 synchronize_net();
1676}
1677
1678static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1679 struct nlattr *data[],
1680 struct netlink_ext_ack *extack)
1681{
1682 struct geneve_dev *geneve = netdev_priv(dev);
1683 struct geneve_sock *gs4, *gs6;
1684 struct geneve_config cfg;
1685 int err;
1686
1687 /* If the geneve device is configured for metadata (or externally
1688 * controlled, for example, OVS), then nothing can be changed.
1689 */
1690 if (geneve->cfg.collect_md)
1691 return -EOPNOTSUPP;
1692
1693 /* Start with the existing info. */
1694 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1695 err = geneve_nl2info(tb, data, extack, &cfg, true);
1696 if (err)
1697 return err;
1698
1699 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1700 dst_cache_reset(&cfg.info.dst_cache);
1701 geneve_link_config(dev, &cfg.info, tb);
1702 }
1703
1704 geneve_quiesce(geneve, &gs4, &gs6);
1705 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1706 geneve_unquiesce(geneve, gs4, gs6);
1707
1708 return 0;
1709}
1710
1711static void geneve_dellink(struct net_device *dev, struct list_head *head)
1712{
1713 struct geneve_dev *geneve = netdev_priv(dev);
1714
1715 list_del(&geneve->next);
1716 unregister_netdevice_queue(dev, head);
1717}
1718
1719static size_t geneve_get_size(const struct net_device *dev)
1720{
1721 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1722 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1723 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1724 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1725 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1726 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1727 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1728 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1729 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1730 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1731 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1732 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1733 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1734 0;
1735}
1736
1737static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1738{
1739 struct geneve_dev *geneve = netdev_priv(dev);
1740 struct ip_tunnel_info *info = &geneve->cfg.info;
1741 bool ttl_inherit = geneve->cfg.ttl_inherit;
1742 bool metadata = geneve->cfg.collect_md;
1743 __u8 tmp_vni[3];
1744 __u32 vni;
1745
1746 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1747 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1748 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1749 goto nla_put_failure;
1750
1751 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1752 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1753 info->key.u.ipv4.dst))
1754 goto nla_put_failure;
1755 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1756 !!(info->key.tun_flags & TUNNEL_CSUM)))
1757 goto nla_put_failure;
1758
1759#if IS_ENABLED(CONFIG_IPV6)
1760 } else if (!metadata) {
1761 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1762 &info->key.u.ipv6.dst))
1763 goto nla_put_failure;
1764 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1765 !(info->key.tun_flags & TUNNEL_CSUM)))
1766 goto nla_put_failure;
1767#endif
1768 }
1769
1770 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1771 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1772 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1773 goto nla_put_failure;
1774
1775 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1776 goto nla_put_failure;
1777
1778 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1779 goto nla_put_failure;
1780
1781 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1782 goto nla_put_failure;
1783
1784#if IS_ENABLED(CONFIG_IPV6)
1785 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1786 !geneve->cfg.use_udp6_rx_checksums))
1787 goto nla_put_failure;
1788#endif
1789
1790 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1791 goto nla_put_failure;
1792
1793 if (geneve->cfg.inner_proto_inherit &&
1794 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1795 goto nla_put_failure;
1796
1797 return 0;
1798
1799nla_put_failure:
1800 return -EMSGSIZE;
1801}
1802
1803static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1804 .kind = "geneve",
1805 .maxtype = IFLA_GENEVE_MAX,
1806 .policy = geneve_policy,
1807 .priv_size = sizeof(struct geneve_dev),
1808 .setup = geneve_setup,
1809 .validate = geneve_validate,
1810 .newlink = geneve_newlink,
1811 .changelink = geneve_changelink,
1812 .dellink = geneve_dellink,
1813 .get_size = geneve_get_size,
1814 .fill_info = geneve_fill_info,
1815};
1816
1817struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1818 u8 name_assign_type, u16 dst_port)
1819{
1820 struct nlattr *tb[IFLA_MAX + 1];
1821 struct net_device *dev;
1822 LIST_HEAD(list_kill);
1823 int err;
1824 struct geneve_config cfg = {
1825 .df = GENEVE_DF_UNSET,
1826 .use_udp6_rx_checksums = true,
1827 .ttl_inherit = false,
1828 .collect_md = true,
1829 };
1830
1831 memset(tb, 0, sizeof(tb));
1832 dev = rtnl_create_link(net, name, name_assign_type,
1833 &geneve_link_ops, tb, NULL);
1834 if (IS_ERR(dev))
1835 return dev;
1836
1837 init_tnl_info(&cfg.info, dst_port);
1838 err = geneve_configure(net, dev, NULL, &cfg);
1839 if (err) {
1840 free_netdev(dev);
1841 return ERR_PTR(err);
1842 }
1843
1844 /* openvswitch users expect packet sizes to be unrestricted,
1845 * so set the largest MTU we can.
1846 */
1847 err = geneve_change_mtu(dev, IP_MAX_MTU);
1848 if (err)
1849 goto err;
1850
1851 err = rtnl_configure_link(dev, NULL, 0, NULL);
1852 if (err < 0)
1853 goto err;
1854
1855 return dev;
1856err:
1857 geneve_dellink(dev, &list_kill);
1858 unregister_netdevice_many(&list_kill);
1859 return ERR_PTR(err);
1860}
1861EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1862
1863static int geneve_netdevice_event(struct notifier_block *unused,
1864 unsigned long event, void *ptr)
1865{
1866 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1867
1868 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1869 geneve_offload_rx_ports(dev, true);
1870 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1871 geneve_offload_rx_ports(dev, false);
1872
1873 return NOTIFY_DONE;
1874}
1875
1876static struct notifier_block geneve_notifier_block __read_mostly = {
1877 .notifier_call = geneve_netdevice_event,
1878};
1879
1880static __net_init int geneve_init_net(struct net *net)
1881{
1882 struct geneve_net *gn = net_generic(net, geneve_net_id);
1883
1884 INIT_LIST_HEAD(&gn->geneve_list);
1885 INIT_LIST_HEAD(&gn->sock_list);
1886 return 0;
1887}
1888
1889static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1890{
1891 struct geneve_net *gn = net_generic(net, geneve_net_id);
1892 struct geneve_dev *geneve, *next;
1893 struct net_device *dev, *aux;
1894
1895 /* gather any geneve devices that were moved into this ns */
1896 for_each_netdev_safe(net, dev, aux)
1897 if (dev->rtnl_link_ops == &geneve_link_ops)
1898 unregister_netdevice_queue(dev, head);
1899
1900 /* now gather any other geneve devices that were created in this ns */
1901 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1902 /* If geneve->dev is in the same netns, it was already added
1903 * to the list by the previous loop.
1904 */
1905 if (!net_eq(dev_net(geneve->dev), net))
1906 unregister_netdevice_queue(geneve->dev, head);
1907 }
1908}
1909
1910static void __net_exit geneve_exit_batch_rtnl(struct list_head *net_list,
1911 struct list_head *dev_to_kill)
1912{
1913 struct net *net;
1914
1915 list_for_each_entry(net, net_list, exit_list)
1916 geneve_destroy_tunnels(net, dev_to_kill);
1917}
1918
1919static void __net_exit geneve_exit_net(struct net *net)
1920{
1921 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1922
1923 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1924}
1925
1926static struct pernet_operations geneve_net_ops = {
1927 .init = geneve_init_net,
1928 .exit_batch_rtnl = geneve_exit_batch_rtnl,
1929 .exit = geneve_exit_net,
1930 .id = &geneve_net_id,
1931 .size = sizeof(struct geneve_net),
1932};
1933
1934static int __init geneve_init_module(void)
1935{
1936 int rc;
1937
1938 rc = register_pernet_subsys(&geneve_net_ops);
1939 if (rc)
1940 goto out1;
1941
1942 rc = register_netdevice_notifier(&geneve_notifier_block);
1943 if (rc)
1944 goto out2;
1945
1946 rc = rtnl_link_register(&geneve_link_ops);
1947 if (rc)
1948 goto out3;
1949
1950 return 0;
1951out3:
1952 unregister_netdevice_notifier(&geneve_notifier_block);
1953out2:
1954 unregister_pernet_subsys(&geneve_net_ops);
1955out1:
1956 return rc;
1957}
1958late_initcall(geneve_init_module);
1959
1960static void __exit geneve_cleanup_module(void)
1961{
1962 rtnl_link_unregister(&geneve_link_ops);
1963 unregister_netdevice_notifier(&geneve_notifier_block);
1964 unregister_pernet_subsys(&geneve_net_ops);
1965}
1966module_exit(geneve_cleanup_module);
1967
1968MODULE_LICENSE("GPL");
1969MODULE_VERSION(GENEVE_NETDEV_VER);
1970MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1971MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1972MODULE_ALIAS_RTNL_LINK("geneve");