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Merge tag 'mac80211-for-davem-2016-06-29-v2' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-focal-kernel.git] / drivers / net / geneve.c
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/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/hash.h>
18 #include <net/dst_metadata.h>
19 #include <net/gro_cells.h>
20 #include <net/rtnetlink.h>
21 #include <net/geneve.h>
22 #include <net/protocol.h>
23
24 #define GENEVE_NETDEV_VER "0.6"
25
26 #define GENEVE_UDP_PORT 6081
27
28 #define GENEVE_N_VID (1u << 24)
29 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
30
31 #define VNI_HASH_BITS 10
32 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33
34 static bool log_ecn_error = true;
35 module_param(log_ecn_error, bool, 0644);
36 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
37
38 #define GENEVE_VER 0
39 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
40
41 /* per-network namespace private data for this module */
42 struct geneve_net {
43 struct list_head geneve_list;
44 struct list_head sock_list;
45 };
46
47 static int geneve_net_id;
48
49 union geneve_addr {
50 struct sockaddr_in sin;
51 struct sockaddr_in6 sin6;
52 struct sockaddr sa;
53 };
54
55 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
56
57 /* Pseudo network device */
58 struct geneve_dev {
59 struct hlist_node hlist; /* vni hash table */
60 struct net *net; /* netns for packet i/o */
61 struct net_device *dev; /* netdev for geneve tunnel */
62 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
63 #if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
65 #endif
66 u8 vni[3]; /* virtual network ID for tunnel */
67 u8 ttl; /* TTL override */
68 u8 tos; /* TOS override */
69 union geneve_addr remote; /* IP address for link partner */
70 struct list_head next; /* geneve's per namespace list */
71 __be32 label; /* IPv6 flowlabel override */
72 __be16 dst_port;
73 bool collect_md;
74 struct gro_cells gro_cells;
75 u32 flags;
76 struct dst_cache dst_cache;
77 };
78
79 /* Geneve device flags */
80 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
81 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
82 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
83
84 struct geneve_sock {
85 bool collect_md;
86 struct list_head list;
87 struct socket *sock;
88 struct rcu_head rcu;
89 int refcnt;
90 struct hlist_head vni_list[VNI_HASH_SIZE];
91 u32 flags;
92 };
93
94 static inline __u32 geneve_net_vni_hash(u8 vni[3])
95 {
96 __u32 vnid;
97
98 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
99 return hash_32(vnid, VNI_HASH_BITS);
100 }
101
102 static __be64 vni_to_tunnel_id(const __u8 *vni)
103 {
104 #ifdef __BIG_ENDIAN
105 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
106 #else
107 return (__force __be64)(((__force u64)vni[0] << 40) |
108 ((__force u64)vni[1] << 48) |
109 ((__force u64)vni[2] << 56));
110 #endif
111 }
112
113 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
114 {
115 return gs->sock->sk->sk_family;
116 }
117
118 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
119 __be32 addr, u8 vni[])
120 {
121 struct hlist_head *vni_list_head;
122 struct geneve_dev *geneve;
123 __u32 hash;
124
125 /* Find the device for this VNI */
126 hash = geneve_net_vni_hash(vni);
127 vni_list_head = &gs->vni_list[hash];
128 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
129 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
130 addr == geneve->remote.sin.sin_addr.s_addr)
131 return geneve;
132 }
133 return NULL;
134 }
135
136 #if IS_ENABLED(CONFIG_IPV6)
137 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
138 struct in6_addr addr6, u8 vni[])
139 {
140 struct hlist_head *vni_list_head;
141 struct geneve_dev *geneve;
142 __u32 hash;
143
144 /* Find the device for this VNI */
145 hash = geneve_net_vni_hash(vni);
146 vni_list_head = &gs->vni_list[hash];
147 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
148 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
149 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
150 return geneve;
151 }
152 return NULL;
153 }
154 #endif
155
156 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
157 {
158 return (struct genevehdr *)(udp_hdr(skb) + 1);
159 }
160
161 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
162 struct sk_buff *skb)
163 {
164 u8 *vni;
165 __be32 addr;
166 static u8 zero_vni[3];
167 #if IS_ENABLED(CONFIG_IPV6)
168 static struct in6_addr zero_addr6;
169 #endif
170
171 if (geneve_get_sk_family(gs) == AF_INET) {
172 struct iphdr *iph;
173
174 iph = ip_hdr(skb); /* outer IP header... */
175
176 if (gs->collect_md) {
177 vni = zero_vni;
178 addr = 0;
179 } else {
180 vni = geneve_hdr(skb)->vni;
181 addr = iph->saddr;
182 }
183
184 return geneve_lookup(gs, addr, vni);
185 #if IS_ENABLED(CONFIG_IPV6)
186 } else if (geneve_get_sk_family(gs) == AF_INET6) {
187 struct ipv6hdr *ip6h;
188 struct in6_addr addr6;
189
190 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
191
192 if (gs->collect_md) {
193 vni = zero_vni;
194 addr6 = zero_addr6;
195 } else {
196 vni = geneve_hdr(skb)->vni;
197 addr6 = ip6h->saddr;
198 }
199
200 return geneve6_lookup(gs, addr6, vni);
201 #endif
202 }
203 return NULL;
204 }
205
206 /* geneve receive/decap routine */
207 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
208 struct sk_buff *skb)
209 {
210 struct genevehdr *gnvh = geneve_hdr(skb);
211 struct metadata_dst *tun_dst = NULL;
212 struct pcpu_sw_netstats *stats;
213 int err = 0;
214 void *oiph;
215
216 if (ip_tunnel_collect_metadata() || gs->collect_md) {
217 __be16 flags;
218
219 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
220 (gnvh->oam ? TUNNEL_OAM : 0) |
221 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
222
223 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
224 vni_to_tunnel_id(gnvh->vni),
225 gnvh->opt_len * 4);
226 if (!tun_dst)
227 goto drop;
228 /* Update tunnel dst according to Geneve options. */
229 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
230 gnvh->options, gnvh->opt_len * 4);
231 } else {
232 /* Drop packets w/ critical options,
233 * since we don't support any...
234 */
235 if (gnvh->critical)
236 goto drop;
237 }
238
239 skb_reset_mac_header(skb);
240 skb->protocol = eth_type_trans(skb, geneve->dev);
241 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
242
243 if (tun_dst)
244 skb_dst_set(skb, &tun_dst->dst);
245
246 /* Ignore packet loops (and multicast echo) */
247 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
248 goto drop;
249
250 oiph = skb_network_header(skb);
251 skb_reset_network_header(skb);
252
253 if (geneve_get_sk_family(gs) == AF_INET)
254 err = IP_ECN_decapsulate(oiph, skb);
255 #if IS_ENABLED(CONFIG_IPV6)
256 else
257 err = IP6_ECN_decapsulate(oiph, skb);
258 #endif
259
260 if (unlikely(err)) {
261 if (log_ecn_error) {
262 if (geneve_get_sk_family(gs) == AF_INET)
263 net_info_ratelimited("non-ECT from %pI4 "
264 "with TOS=%#x\n",
265 &((struct iphdr *)oiph)->saddr,
266 ((struct iphdr *)oiph)->tos);
267 #if IS_ENABLED(CONFIG_IPV6)
268 else
269 net_info_ratelimited("non-ECT from %pI6\n",
270 &((struct ipv6hdr *)oiph)->saddr);
271 #endif
272 }
273 if (err > 1) {
274 ++geneve->dev->stats.rx_frame_errors;
275 ++geneve->dev->stats.rx_errors;
276 goto drop;
277 }
278 }
279
280 stats = this_cpu_ptr(geneve->dev->tstats);
281 u64_stats_update_begin(&stats->syncp);
282 stats->rx_packets++;
283 stats->rx_bytes += skb->len;
284 u64_stats_update_end(&stats->syncp);
285
286 gro_cells_receive(&geneve->gro_cells, skb);
287 return;
288 drop:
289 /* Consume bad packet */
290 kfree_skb(skb);
291 }
292
293 /* Setup stats when device is created */
294 static int geneve_init(struct net_device *dev)
295 {
296 struct geneve_dev *geneve = netdev_priv(dev);
297 int err;
298
299 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
300 if (!dev->tstats)
301 return -ENOMEM;
302
303 err = gro_cells_init(&geneve->gro_cells, dev);
304 if (err) {
305 free_percpu(dev->tstats);
306 return err;
307 }
308
309 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
310 if (err) {
311 free_percpu(dev->tstats);
312 gro_cells_destroy(&geneve->gro_cells);
313 return err;
314 }
315
316 return 0;
317 }
318
319 static void geneve_uninit(struct net_device *dev)
320 {
321 struct geneve_dev *geneve = netdev_priv(dev);
322
323 dst_cache_destroy(&geneve->dst_cache);
324 gro_cells_destroy(&geneve->gro_cells);
325 free_percpu(dev->tstats);
326 }
327
328 /* Callback from net/ipv4/udp.c to receive packets */
329 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
330 {
331 struct genevehdr *geneveh;
332 struct geneve_dev *geneve;
333 struct geneve_sock *gs;
334 int opts_len;
335
336 /* Need Geneve and inner Ethernet header to be present */
337 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
338 goto drop;
339
340 /* Return packets with reserved bits set */
341 geneveh = geneve_hdr(skb);
342 if (unlikely(geneveh->ver != GENEVE_VER))
343 goto drop;
344
345 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
346 goto drop;
347
348 gs = rcu_dereference_sk_user_data(sk);
349 if (!gs)
350 goto drop;
351
352 geneve = geneve_lookup_skb(gs, skb);
353 if (!geneve)
354 goto drop;
355
356 opts_len = geneveh->opt_len * 4;
357 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
358 htons(ETH_P_TEB),
359 !net_eq(geneve->net, dev_net(geneve->dev))))
360 goto drop;
361
362 geneve_rx(geneve, gs, skb);
363 return 0;
364
365 drop:
366 /* Consume bad packet */
367 kfree_skb(skb);
368 return 0;
369 }
370
371 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
372 __be16 port, u32 flags)
373 {
374 struct socket *sock;
375 struct udp_port_cfg udp_conf;
376 int err;
377
378 memset(&udp_conf, 0, sizeof(udp_conf));
379
380 if (ipv6) {
381 udp_conf.family = AF_INET6;
382 udp_conf.ipv6_v6only = 1;
383 udp_conf.use_udp6_rx_checksums =
384 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
385 } else {
386 udp_conf.family = AF_INET;
387 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
388 }
389
390 udp_conf.local_udp_port = port;
391
392 /* Open UDP socket */
393 err = udp_sock_create(net, &udp_conf, &sock);
394 if (err < 0)
395 return ERR_PTR(err);
396
397 return sock;
398 }
399
400 static void geneve_notify_add_rx_port(struct geneve_sock *gs)
401 {
402 struct net_device *dev;
403 struct sock *sk = gs->sock->sk;
404 struct net *net = sock_net(sk);
405 sa_family_t sa_family = geneve_get_sk_family(gs);
406 __be16 port = inet_sk(sk)->inet_sport;
407
408 rcu_read_lock();
409 for_each_netdev_rcu(net, dev) {
410 if (dev->netdev_ops->ndo_add_geneve_port)
411 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
412 port);
413 }
414 rcu_read_unlock();
415 }
416
417 static int geneve_hlen(struct genevehdr *gh)
418 {
419 return sizeof(*gh) + gh->opt_len * 4;
420 }
421
422 static struct sk_buff **geneve_gro_receive(struct sock *sk,
423 struct sk_buff **head,
424 struct sk_buff *skb)
425 {
426 struct sk_buff *p, **pp = NULL;
427 struct genevehdr *gh, *gh2;
428 unsigned int hlen, gh_len, off_gnv;
429 const struct packet_offload *ptype;
430 __be16 type;
431 int flush = 1;
432
433 off_gnv = skb_gro_offset(skb);
434 hlen = off_gnv + sizeof(*gh);
435 gh = skb_gro_header_fast(skb, off_gnv);
436 if (skb_gro_header_hard(skb, hlen)) {
437 gh = skb_gro_header_slow(skb, hlen, off_gnv);
438 if (unlikely(!gh))
439 goto out;
440 }
441
442 if (gh->ver != GENEVE_VER || gh->oam)
443 goto out;
444 gh_len = geneve_hlen(gh);
445
446 hlen = off_gnv + gh_len;
447 if (skb_gro_header_hard(skb, hlen)) {
448 gh = skb_gro_header_slow(skb, hlen, off_gnv);
449 if (unlikely(!gh))
450 goto out;
451 }
452
453 for (p = *head; p; p = p->next) {
454 if (!NAPI_GRO_CB(p)->same_flow)
455 continue;
456
457 gh2 = (struct genevehdr *)(p->data + off_gnv);
458 if (gh->opt_len != gh2->opt_len ||
459 memcmp(gh, gh2, gh_len)) {
460 NAPI_GRO_CB(p)->same_flow = 0;
461 continue;
462 }
463 }
464
465 type = gh->proto_type;
466
467 rcu_read_lock();
468 ptype = gro_find_receive_by_type(type);
469 if (!ptype)
470 goto out_unlock;
471
472 skb_gro_pull(skb, gh_len);
473 skb_gro_postpull_rcsum(skb, gh, gh_len);
474 pp = ptype->callbacks.gro_receive(head, skb);
475 flush = 0;
476
477 out_unlock:
478 rcu_read_unlock();
479 out:
480 NAPI_GRO_CB(skb)->flush |= flush;
481
482 return pp;
483 }
484
485 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
486 int nhoff)
487 {
488 struct genevehdr *gh;
489 struct packet_offload *ptype;
490 __be16 type;
491 int gh_len;
492 int err = -ENOSYS;
493
494 gh = (struct genevehdr *)(skb->data + nhoff);
495 gh_len = geneve_hlen(gh);
496 type = gh->proto_type;
497
498 rcu_read_lock();
499 ptype = gro_find_complete_by_type(type);
500 if (ptype)
501 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
502
503 rcu_read_unlock();
504
505 skb_set_inner_mac_header(skb, nhoff + gh_len);
506
507 return err;
508 }
509
510 /* Create new listen socket if needed */
511 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
512 bool ipv6, u32 flags)
513 {
514 struct geneve_net *gn = net_generic(net, geneve_net_id);
515 struct geneve_sock *gs;
516 struct socket *sock;
517 struct udp_tunnel_sock_cfg tunnel_cfg;
518 int h;
519
520 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
521 if (!gs)
522 return ERR_PTR(-ENOMEM);
523
524 sock = geneve_create_sock(net, ipv6, port, flags);
525 if (IS_ERR(sock)) {
526 kfree(gs);
527 return ERR_CAST(sock);
528 }
529
530 gs->sock = sock;
531 gs->refcnt = 1;
532 for (h = 0; h < VNI_HASH_SIZE; ++h)
533 INIT_HLIST_HEAD(&gs->vni_list[h]);
534
535 /* Initialize the geneve udp offloads structure */
536 geneve_notify_add_rx_port(gs);
537
538 /* Mark socket as an encapsulation socket */
539 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
540 tunnel_cfg.sk_user_data = gs;
541 tunnel_cfg.encap_type = 1;
542 tunnel_cfg.gro_receive = geneve_gro_receive;
543 tunnel_cfg.gro_complete = geneve_gro_complete;
544 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
545 tunnel_cfg.encap_destroy = NULL;
546 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
547 list_add(&gs->list, &gn->sock_list);
548 return gs;
549 }
550
551 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
552 {
553 struct net_device *dev;
554 struct sock *sk = gs->sock->sk;
555 struct net *net = sock_net(sk);
556 sa_family_t sa_family = geneve_get_sk_family(gs);
557 __be16 port = inet_sk(sk)->inet_sport;
558
559 rcu_read_lock();
560 for_each_netdev_rcu(net, dev) {
561 if (dev->netdev_ops->ndo_del_geneve_port)
562 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
563 port);
564 }
565
566 rcu_read_unlock();
567 }
568
569 static void __geneve_sock_release(struct geneve_sock *gs)
570 {
571 if (!gs || --gs->refcnt)
572 return;
573
574 list_del(&gs->list);
575 geneve_notify_del_rx_port(gs);
576 udp_tunnel_sock_release(gs->sock);
577 kfree_rcu(gs, rcu);
578 }
579
580 static void geneve_sock_release(struct geneve_dev *geneve)
581 {
582 __geneve_sock_release(geneve->sock4);
583 #if IS_ENABLED(CONFIG_IPV6)
584 __geneve_sock_release(geneve->sock6);
585 #endif
586 }
587
588 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
589 sa_family_t family,
590 __be16 dst_port)
591 {
592 struct geneve_sock *gs;
593
594 list_for_each_entry(gs, &gn->sock_list, list) {
595 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
596 geneve_get_sk_family(gs) == family) {
597 return gs;
598 }
599 }
600 return NULL;
601 }
602
603 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
604 {
605 struct net *net = geneve->net;
606 struct geneve_net *gn = net_generic(net, geneve_net_id);
607 struct geneve_sock *gs;
608 __u32 hash;
609
610 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
611 if (gs) {
612 gs->refcnt++;
613 goto out;
614 }
615
616 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
617 if (IS_ERR(gs))
618 return PTR_ERR(gs);
619
620 out:
621 gs->collect_md = geneve->collect_md;
622 gs->flags = geneve->flags;
623 #if IS_ENABLED(CONFIG_IPV6)
624 if (ipv6)
625 geneve->sock6 = gs;
626 else
627 #endif
628 geneve->sock4 = gs;
629
630 hash = geneve_net_vni_hash(geneve->vni);
631 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
632 return 0;
633 }
634
635 static int geneve_open(struct net_device *dev)
636 {
637 struct geneve_dev *geneve = netdev_priv(dev);
638 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
639 bool metadata = geneve->collect_md;
640 int ret = 0;
641
642 geneve->sock4 = NULL;
643 #if IS_ENABLED(CONFIG_IPV6)
644 geneve->sock6 = NULL;
645 if (ipv6 || metadata)
646 ret = geneve_sock_add(geneve, true);
647 #endif
648 if (!ret && (!ipv6 || metadata))
649 ret = geneve_sock_add(geneve, false);
650 if (ret < 0)
651 geneve_sock_release(geneve);
652
653 return ret;
654 }
655
656 static int geneve_stop(struct net_device *dev)
657 {
658 struct geneve_dev *geneve = netdev_priv(dev);
659
660 if (!hlist_unhashed(&geneve->hlist))
661 hlist_del_rcu(&geneve->hlist);
662 geneve_sock_release(geneve);
663 return 0;
664 }
665
666 static void geneve_build_header(struct genevehdr *geneveh,
667 __be16 tun_flags, u8 vni[3],
668 u8 options_len, u8 *options)
669 {
670 geneveh->ver = GENEVE_VER;
671 geneveh->opt_len = options_len / 4;
672 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
673 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
674 geneveh->rsvd1 = 0;
675 memcpy(geneveh->vni, vni, 3);
676 geneveh->proto_type = htons(ETH_P_TEB);
677 geneveh->rsvd2 = 0;
678
679 memcpy(geneveh->options, options, options_len);
680 }
681
682 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
683 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
684 u32 flags, bool xnet)
685 {
686 struct genevehdr *gnvh;
687 int min_headroom;
688 int err;
689 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
690
691 skb_scrub_packet(skb, xnet);
692
693 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
694 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
695 err = skb_cow_head(skb, min_headroom);
696 if (unlikely(err))
697 goto free_rt;
698
699 err = udp_tunnel_handle_offloads(skb, udp_sum);
700 if (err)
701 goto free_rt;
702
703 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
704 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
705
706 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
707 return 0;
708
709 free_rt:
710 ip_rt_put(rt);
711 return err;
712 }
713
714 #if IS_ENABLED(CONFIG_IPV6)
715 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
716 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
717 u32 flags, bool xnet)
718 {
719 struct genevehdr *gnvh;
720 int min_headroom;
721 int err;
722 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
723
724 skb_scrub_packet(skb, xnet);
725
726 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
727 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
728 err = skb_cow_head(skb, min_headroom);
729 if (unlikely(err))
730 goto free_dst;
731
732 err = udp_tunnel_handle_offloads(skb, udp_sum);
733 if (err)
734 goto free_dst;
735
736 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
737 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
738
739 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
740 return 0;
741
742 free_dst:
743 dst_release(dst);
744 return err;
745 }
746 #endif
747
748 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
749 struct net_device *dev,
750 struct flowi4 *fl4,
751 struct ip_tunnel_info *info)
752 {
753 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
754 struct geneve_dev *geneve = netdev_priv(dev);
755 struct dst_cache *dst_cache;
756 struct rtable *rt = NULL;
757 __u8 tos;
758
759 memset(fl4, 0, sizeof(*fl4));
760 fl4->flowi4_mark = skb->mark;
761 fl4->flowi4_proto = IPPROTO_UDP;
762
763 if (info) {
764 fl4->daddr = info->key.u.ipv4.dst;
765 fl4->saddr = info->key.u.ipv4.src;
766 fl4->flowi4_tos = RT_TOS(info->key.tos);
767 dst_cache = &info->dst_cache;
768 } else {
769 tos = geneve->tos;
770 if (tos == 1) {
771 const struct iphdr *iip = ip_hdr(skb);
772
773 tos = ip_tunnel_get_dsfield(iip, skb);
774 use_cache = false;
775 }
776
777 fl4->flowi4_tos = RT_TOS(tos);
778 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
779 dst_cache = &geneve->dst_cache;
780 }
781
782 if (use_cache) {
783 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
784 if (rt)
785 return rt;
786 }
787
788 rt = ip_route_output_key(geneve->net, fl4);
789 if (IS_ERR(rt)) {
790 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
791 return ERR_PTR(-ENETUNREACH);
792 }
793 if (rt->dst.dev == dev) { /* is this necessary? */
794 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
795 ip_rt_put(rt);
796 return ERR_PTR(-ELOOP);
797 }
798 if (use_cache)
799 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
800 return rt;
801 }
802
803 #if IS_ENABLED(CONFIG_IPV6)
804 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
805 struct net_device *dev,
806 struct flowi6 *fl6,
807 struct ip_tunnel_info *info)
808 {
809 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
810 struct geneve_dev *geneve = netdev_priv(dev);
811 struct geneve_sock *gs6 = geneve->sock6;
812 struct dst_entry *dst = NULL;
813 struct dst_cache *dst_cache;
814 __u8 prio;
815
816 memset(fl6, 0, sizeof(*fl6));
817 fl6->flowi6_mark = skb->mark;
818 fl6->flowi6_proto = IPPROTO_UDP;
819
820 if (info) {
821 fl6->daddr = info->key.u.ipv6.dst;
822 fl6->saddr = info->key.u.ipv6.src;
823 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
824 info->key.label);
825 dst_cache = &info->dst_cache;
826 } else {
827 prio = geneve->tos;
828 if (prio == 1) {
829 const struct iphdr *iip = ip_hdr(skb);
830
831 prio = ip_tunnel_get_dsfield(iip, skb);
832 use_cache = false;
833 }
834
835 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
836 geneve->label);
837 fl6->daddr = geneve->remote.sin6.sin6_addr;
838 dst_cache = &geneve->dst_cache;
839 }
840
841 if (use_cache) {
842 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
843 if (dst)
844 return dst;
845 }
846
847 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
848 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
849 return ERR_PTR(-ENETUNREACH);
850 }
851 if (dst->dev == dev) { /* is this necessary? */
852 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
853 dst_release(dst);
854 return ERR_PTR(-ELOOP);
855 }
856
857 if (use_cache)
858 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
859 return dst;
860 }
861 #endif
862
863 /* Convert 64 bit tunnel ID to 24 bit VNI. */
864 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
865 {
866 #ifdef __BIG_ENDIAN
867 vni[0] = (__force __u8)(tun_id >> 16);
868 vni[1] = (__force __u8)(tun_id >> 8);
869 vni[2] = (__force __u8)tun_id;
870 #else
871 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
872 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
873 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
874 #endif
875 }
876
877 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
878 struct ip_tunnel_info *info)
879 {
880 struct geneve_dev *geneve = netdev_priv(dev);
881 struct geneve_sock *gs4 = geneve->sock4;
882 struct rtable *rt = NULL;
883 const struct iphdr *iip; /* interior IP header */
884 int err = -EINVAL;
885 struct flowi4 fl4;
886 __u8 tos, ttl;
887 __be16 sport;
888 __be16 df;
889 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
890 u32 flags = geneve->flags;
891
892 if (geneve->collect_md) {
893 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
894 netdev_dbg(dev, "no tunnel metadata\n");
895 goto tx_error;
896 }
897 if (info && ip_tunnel_info_af(info) != AF_INET)
898 goto tx_error;
899 }
900
901 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
902 if (IS_ERR(rt)) {
903 err = PTR_ERR(rt);
904 goto tx_error;
905 }
906
907 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
908 skb_reset_mac_header(skb);
909
910 iip = ip_hdr(skb);
911
912 if (info) {
913 const struct ip_tunnel_key *key = &info->key;
914 u8 *opts = NULL;
915 u8 vni[3];
916
917 tunnel_id_to_vni(key->tun_id, vni);
918 if (info->options_len)
919 opts = ip_tunnel_info_opts(info);
920
921 if (key->tun_flags & TUNNEL_CSUM)
922 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
923 else
924 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
925
926 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
927 info->options_len, opts, flags, xnet);
928 if (unlikely(err))
929 goto tx_error;
930
931 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
932 ttl = key->ttl;
933 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
934 } else {
935 err = geneve_build_skb(rt, skb, 0, geneve->vni,
936 0, NULL, flags, xnet);
937 if (unlikely(err))
938 goto tx_error;
939
940 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
941 ttl = geneve->ttl;
942 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
943 ttl = 1;
944 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
945 df = 0;
946 }
947 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
948 tos, ttl, df, sport, geneve->dst_port,
949 !net_eq(geneve->net, dev_net(geneve->dev)),
950 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
951
952 return NETDEV_TX_OK;
953
954 tx_error:
955 dev_kfree_skb(skb);
956
957 if (err == -ELOOP)
958 dev->stats.collisions++;
959 else if (err == -ENETUNREACH)
960 dev->stats.tx_carrier_errors++;
961
962 dev->stats.tx_errors++;
963 return NETDEV_TX_OK;
964 }
965
966 #if IS_ENABLED(CONFIG_IPV6)
967 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
968 struct ip_tunnel_info *info)
969 {
970 struct geneve_dev *geneve = netdev_priv(dev);
971 struct geneve_sock *gs6 = geneve->sock6;
972 struct dst_entry *dst = NULL;
973 const struct iphdr *iip; /* interior IP header */
974 int err = -EINVAL;
975 struct flowi6 fl6;
976 __u8 prio, ttl;
977 __be16 sport;
978 __be32 label;
979 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
980 u32 flags = geneve->flags;
981
982 if (geneve->collect_md) {
983 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
984 netdev_dbg(dev, "no tunnel metadata\n");
985 goto tx_error;
986 }
987 }
988
989 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
990 if (IS_ERR(dst)) {
991 err = PTR_ERR(dst);
992 goto tx_error;
993 }
994
995 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
996 skb_reset_mac_header(skb);
997
998 iip = ip_hdr(skb);
999
1000 if (info) {
1001 const struct ip_tunnel_key *key = &info->key;
1002 u8 *opts = NULL;
1003 u8 vni[3];
1004
1005 tunnel_id_to_vni(key->tun_id, vni);
1006 if (info->options_len)
1007 opts = ip_tunnel_info_opts(info);
1008
1009 if (key->tun_flags & TUNNEL_CSUM)
1010 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1011 else
1012 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1013
1014 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1015 info->options_len, opts,
1016 flags, xnet);
1017 if (unlikely(err))
1018 goto tx_error;
1019
1020 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1021 ttl = key->ttl;
1022 label = info->key.label;
1023 } else {
1024 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1025 0, NULL, flags, xnet);
1026 if (unlikely(err))
1027 goto tx_error;
1028
1029 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1030 iip, skb);
1031 ttl = geneve->ttl;
1032 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1033 ttl = 1;
1034 ttl = ttl ? : ip6_dst_hoplimit(dst);
1035 label = geneve->label;
1036 }
1037
1038 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1039 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1040 sport, geneve->dst_port,
1041 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1042 return NETDEV_TX_OK;
1043
1044 tx_error:
1045 dev_kfree_skb(skb);
1046
1047 if (err == -ELOOP)
1048 dev->stats.collisions++;
1049 else if (err == -ENETUNREACH)
1050 dev->stats.tx_carrier_errors++;
1051
1052 dev->stats.tx_errors++;
1053 return NETDEV_TX_OK;
1054 }
1055 #endif
1056
1057 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1058 {
1059 struct geneve_dev *geneve = netdev_priv(dev);
1060 struct ip_tunnel_info *info = NULL;
1061
1062 if (geneve->collect_md)
1063 info = skb_tunnel_info(skb);
1064
1065 #if IS_ENABLED(CONFIG_IPV6)
1066 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1067 (!info && geneve->remote.sa.sa_family == AF_INET6))
1068 return geneve6_xmit_skb(skb, dev, info);
1069 #endif
1070 return geneve_xmit_skb(skb, dev, info);
1071 }
1072
1073 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1074 {
1075 /* The max_mtu calculation does not take account of GENEVE
1076 * options, to avoid excluding potentially valid
1077 * configurations.
1078 */
1079 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1080 - dev->hard_header_len;
1081
1082 if (new_mtu < 68)
1083 return -EINVAL;
1084
1085 if (new_mtu > max_mtu) {
1086 if (strict)
1087 return -EINVAL;
1088
1089 new_mtu = max_mtu;
1090 }
1091
1092 dev->mtu = new_mtu;
1093 return 0;
1094 }
1095
1096 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1097 {
1098 return __geneve_change_mtu(dev, new_mtu, true);
1099 }
1100
1101 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1102 {
1103 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1104 struct geneve_dev *geneve = netdev_priv(dev);
1105 struct rtable *rt;
1106 struct flowi4 fl4;
1107 #if IS_ENABLED(CONFIG_IPV6)
1108 struct dst_entry *dst;
1109 struct flowi6 fl6;
1110 #endif
1111
1112 if (ip_tunnel_info_af(info) == AF_INET) {
1113 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1114 if (IS_ERR(rt))
1115 return PTR_ERR(rt);
1116
1117 ip_rt_put(rt);
1118 info->key.u.ipv4.src = fl4.saddr;
1119 #if IS_ENABLED(CONFIG_IPV6)
1120 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1121 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1122 if (IS_ERR(dst))
1123 return PTR_ERR(dst);
1124
1125 dst_release(dst);
1126 info->key.u.ipv6.src = fl6.saddr;
1127 #endif
1128 } else {
1129 return -EINVAL;
1130 }
1131
1132 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1133 1, USHRT_MAX, true);
1134 info->key.tp_dst = geneve->dst_port;
1135 return 0;
1136 }
1137
1138 static const struct net_device_ops geneve_netdev_ops = {
1139 .ndo_init = geneve_init,
1140 .ndo_uninit = geneve_uninit,
1141 .ndo_open = geneve_open,
1142 .ndo_stop = geneve_stop,
1143 .ndo_start_xmit = geneve_xmit,
1144 .ndo_get_stats64 = ip_tunnel_get_stats64,
1145 .ndo_change_mtu = geneve_change_mtu,
1146 .ndo_validate_addr = eth_validate_addr,
1147 .ndo_set_mac_address = eth_mac_addr,
1148 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1149 };
1150
1151 static void geneve_get_drvinfo(struct net_device *dev,
1152 struct ethtool_drvinfo *drvinfo)
1153 {
1154 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1155 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1156 }
1157
1158 static const struct ethtool_ops geneve_ethtool_ops = {
1159 .get_drvinfo = geneve_get_drvinfo,
1160 .get_link = ethtool_op_get_link,
1161 };
1162
1163 /* Info for udev, that this is a virtual tunnel endpoint */
1164 static struct device_type geneve_type = {
1165 .name = "geneve",
1166 };
1167
1168 /* Calls the ndo_add_geneve_port of the caller in order to
1169 * supply the listening GENEVE udp ports. Callers are expected
1170 * to implement the ndo_add_geneve_port.
1171 */
1172 static void geneve_push_rx_ports(struct net_device *dev)
1173 {
1174 struct net *net = dev_net(dev);
1175 struct geneve_net *gn = net_generic(net, geneve_net_id);
1176 struct geneve_sock *gs;
1177 sa_family_t sa_family;
1178 struct sock *sk;
1179 __be16 port;
1180
1181 if (!dev->netdev_ops->ndo_add_geneve_port)
1182 return;
1183
1184 rcu_read_lock();
1185 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1186 sk = gs->sock->sk;
1187 sa_family = sk->sk_family;
1188 port = inet_sk(sk)->inet_sport;
1189 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1190 }
1191 rcu_read_unlock();
1192 }
1193
1194 /* Initialize the device structure. */
1195 static void geneve_setup(struct net_device *dev)
1196 {
1197 ether_setup(dev);
1198
1199 dev->netdev_ops = &geneve_netdev_ops;
1200 dev->ethtool_ops = &geneve_ethtool_ops;
1201 dev->destructor = free_netdev;
1202
1203 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1204
1205 dev->features |= NETIF_F_LLTX;
1206 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1207 dev->features |= NETIF_F_RXCSUM;
1208 dev->features |= NETIF_F_GSO_SOFTWARE;
1209
1210 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1211 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1212
1213 netif_keep_dst(dev);
1214 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1215 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1216 eth_hw_addr_random(dev);
1217 }
1218
1219 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1220 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1221 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1222 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1223 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1224 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1225 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1226 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1227 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1228 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1229 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1230 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1231 };
1232
1233 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1234 {
1235 if (tb[IFLA_ADDRESS]) {
1236 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1237 return -EINVAL;
1238
1239 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1240 return -EADDRNOTAVAIL;
1241 }
1242
1243 if (!data)
1244 return -EINVAL;
1245
1246 if (data[IFLA_GENEVE_ID]) {
1247 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1248
1249 if (vni >= GENEVE_VID_MASK)
1250 return -ERANGE;
1251 }
1252
1253 return 0;
1254 }
1255
1256 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1257 __be16 dst_port,
1258 union geneve_addr *remote,
1259 u8 vni[],
1260 bool *tun_on_same_port,
1261 bool *tun_collect_md)
1262 {
1263 struct geneve_dev *geneve, *t;
1264
1265 *tun_on_same_port = false;
1266 *tun_collect_md = false;
1267 t = NULL;
1268 list_for_each_entry(geneve, &gn->geneve_list, next) {
1269 if (geneve->dst_port == dst_port) {
1270 *tun_collect_md = geneve->collect_md;
1271 *tun_on_same_port = true;
1272 }
1273 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1274 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1275 dst_port == geneve->dst_port)
1276 t = geneve;
1277 }
1278 return t;
1279 }
1280
1281 static int geneve_configure(struct net *net, struct net_device *dev,
1282 union geneve_addr *remote,
1283 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1284 __be16 dst_port, bool metadata, u32 flags)
1285 {
1286 struct geneve_net *gn = net_generic(net, geneve_net_id);
1287 struct geneve_dev *t, *geneve = netdev_priv(dev);
1288 bool tun_collect_md, tun_on_same_port;
1289 int err, encap_len;
1290
1291 if (!remote)
1292 return -EINVAL;
1293 if (metadata &&
1294 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1295 return -EINVAL;
1296
1297 geneve->net = net;
1298 geneve->dev = dev;
1299
1300 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1301 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1302 geneve->vni[2] = vni & 0x000000ff;
1303
1304 if ((remote->sa.sa_family == AF_INET &&
1305 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1306 (remote->sa.sa_family == AF_INET6 &&
1307 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1308 return -EINVAL;
1309 if (label && remote->sa.sa_family != AF_INET6)
1310 return -EINVAL;
1311
1312 geneve->remote = *remote;
1313
1314 geneve->ttl = ttl;
1315 geneve->tos = tos;
1316 geneve->label = label;
1317 geneve->dst_port = dst_port;
1318 geneve->collect_md = metadata;
1319 geneve->flags = flags;
1320
1321 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1322 &tun_on_same_port, &tun_collect_md);
1323 if (t)
1324 return -EBUSY;
1325
1326 /* make enough headroom for basic scenario */
1327 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1328 if (remote->sa.sa_family == AF_INET)
1329 encap_len += sizeof(struct iphdr);
1330 else
1331 encap_len += sizeof(struct ipv6hdr);
1332 dev->needed_headroom = encap_len + ETH_HLEN;
1333
1334 if (metadata) {
1335 if (tun_on_same_port)
1336 return -EPERM;
1337 } else {
1338 if (tun_collect_md)
1339 return -EPERM;
1340 }
1341
1342 dst_cache_reset(&geneve->dst_cache);
1343
1344 err = register_netdevice(dev);
1345 if (err)
1346 return err;
1347
1348 list_add(&geneve->next, &gn->geneve_list);
1349 return 0;
1350 }
1351
1352 static int geneve_newlink(struct net *net, struct net_device *dev,
1353 struct nlattr *tb[], struct nlattr *data[])
1354 {
1355 __be16 dst_port = htons(GENEVE_UDP_PORT);
1356 __u8 ttl = 0, tos = 0;
1357 bool metadata = false;
1358 union geneve_addr remote = geneve_remote_unspec;
1359 __be32 label = 0;
1360 __u32 vni = 0;
1361 u32 flags = 0;
1362
1363 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1364 return -EINVAL;
1365
1366 if (data[IFLA_GENEVE_REMOTE]) {
1367 remote.sa.sa_family = AF_INET;
1368 remote.sin.sin_addr.s_addr =
1369 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1370 }
1371
1372 if (data[IFLA_GENEVE_REMOTE6]) {
1373 if (!IS_ENABLED(CONFIG_IPV6))
1374 return -EPFNOSUPPORT;
1375
1376 remote.sa.sa_family = AF_INET6;
1377 remote.sin6.sin6_addr =
1378 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1379
1380 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1381 IPV6_ADDR_LINKLOCAL) {
1382 netdev_dbg(dev, "link-local remote is unsupported\n");
1383 return -EINVAL;
1384 }
1385 }
1386
1387 if (data[IFLA_GENEVE_ID])
1388 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1389
1390 if (data[IFLA_GENEVE_TTL])
1391 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1392
1393 if (data[IFLA_GENEVE_TOS])
1394 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1395
1396 if (data[IFLA_GENEVE_LABEL])
1397 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1398 IPV6_FLOWLABEL_MASK;
1399
1400 if (data[IFLA_GENEVE_PORT])
1401 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1402
1403 if (data[IFLA_GENEVE_COLLECT_METADATA])
1404 metadata = true;
1405
1406 if (data[IFLA_GENEVE_UDP_CSUM] &&
1407 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1408 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1409
1410 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1411 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1412 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1413
1414 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1415 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1416 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1417
1418 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1419 dst_port, metadata, flags);
1420 }
1421
1422 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1423 {
1424 struct geneve_dev *geneve = netdev_priv(dev);
1425
1426 list_del(&geneve->next);
1427 unregister_netdevice_queue(dev, head);
1428 }
1429
1430 static size_t geneve_get_size(const struct net_device *dev)
1431 {
1432 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1433 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1434 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1435 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1436 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1437 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1438 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1439 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1440 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1441 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1442 0;
1443 }
1444
1445 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1446 {
1447 struct geneve_dev *geneve = netdev_priv(dev);
1448 __u32 vni;
1449
1450 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1451 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1452 goto nla_put_failure;
1453
1454 if (geneve->remote.sa.sa_family == AF_INET) {
1455 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1456 geneve->remote.sin.sin_addr.s_addr))
1457 goto nla_put_failure;
1458 #if IS_ENABLED(CONFIG_IPV6)
1459 } else {
1460 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1461 &geneve->remote.sin6.sin6_addr))
1462 goto nla_put_failure;
1463 #endif
1464 }
1465
1466 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1467 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1468 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1469 goto nla_put_failure;
1470
1471 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1472 goto nla_put_failure;
1473
1474 if (geneve->collect_md) {
1475 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1476 goto nla_put_failure;
1477 }
1478
1479 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1480 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1481 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1482 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1483 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1484 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1485 goto nla_put_failure;
1486
1487 return 0;
1488
1489 nla_put_failure:
1490 return -EMSGSIZE;
1491 }
1492
1493 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1494 .kind = "geneve",
1495 .maxtype = IFLA_GENEVE_MAX,
1496 .policy = geneve_policy,
1497 .priv_size = sizeof(struct geneve_dev),
1498 .setup = geneve_setup,
1499 .validate = geneve_validate,
1500 .newlink = geneve_newlink,
1501 .dellink = geneve_dellink,
1502 .get_size = geneve_get_size,
1503 .fill_info = geneve_fill_info,
1504 };
1505
1506 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1507 u8 name_assign_type, u16 dst_port)
1508 {
1509 struct nlattr *tb[IFLA_MAX + 1];
1510 struct net_device *dev;
1511 LIST_HEAD(list_kill);
1512 int err;
1513
1514 memset(tb, 0, sizeof(tb));
1515 dev = rtnl_create_link(net, name, name_assign_type,
1516 &geneve_link_ops, tb);
1517 if (IS_ERR(dev))
1518 return dev;
1519
1520 err = geneve_configure(net, dev, &geneve_remote_unspec,
1521 0, 0, 0, 0, htons(dst_port), true,
1522 GENEVE_F_UDP_ZERO_CSUM6_RX);
1523 if (err) {
1524 free_netdev(dev);
1525 return ERR_PTR(err);
1526 }
1527
1528 /* openvswitch users expect packet sizes to be unrestricted,
1529 * so set the largest MTU we can.
1530 */
1531 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1532 if (err)
1533 goto err;
1534
1535 err = rtnl_configure_link(dev, NULL);
1536 if (err < 0)
1537 goto err;
1538
1539 return dev;
1540
1541 err:
1542 geneve_dellink(dev, &list_kill);
1543 unregister_netdevice_many(&list_kill);
1544 return ERR_PTR(err);
1545 }
1546 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1547
1548 static int geneve_netdevice_event(struct notifier_block *unused,
1549 unsigned long event, void *ptr)
1550 {
1551 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1552
1553 if (event == NETDEV_OFFLOAD_PUSH_GENEVE)
1554 geneve_push_rx_ports(dev);
1555
1556 return NOTIFY_DONE;
1557 }
1558
1559 static struct notifier_block geneve_notifier_block __read_mostly = {
1560 .notifier_call = geneve_netdevice_event,
1561 };
1562
1563 static __net_init int geneve_init_net(struct net *net)
1564 {
1565 struct geneve_net *gn = net_generic(net, geneve_net_id);
1566
1567 INIT_LIST_HEAD(&gn->geneve_list);
1568 INIT_LIST_HEAD(&gn->sock_list);
1569 return 0;
1570 }
1571
1572 static void __net_exit geneve_exit_net(struct net *net)
1573 {
1574 struct geneve_net *gn = net_generic(net, geneve_net_id);
1575 struct geneve_dev *geneve, *next;
1576 struct net_device *dev, *aux;
1577 LIST_HEAD(list);
1578
1579 rtnl_lock();
1580
1581 /* gather any geneve devices that were moved into this ns */
1582 for_each_netdev_safe(net, dev, aux)
1583 if (dev->rtnl_link_ops == &geneve_link_ops)
1584 unregister_netdevice_queue(dev, &list);
1585
1586 /* now gather any other geneve devices that were created in this ns */
1587 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1588 /* If geneve->dev is in the same netns, it was already added
1589 * to the list by the previous loop.
1590 */
1591 if (!net_eq(dev_net(geneve->dev), net))
1592 unregister_netdevice_queue(geneve->dev, &list);
1593 }
1594
1595 /* unregister the devices gathered above */
1596 unregister_netdevice_many(&list);
1597 rtnl_unlock();
1598 }
1599
1600 static struct pernet_operations geneve_net_ops = {
1601 .init = geneve_init_net,
1602 .exit = geneve_exit_net,
1603 .id = &geneve_net_id,
1604 .size = sizeof(struct geneve_net),
1605 };
1606
1607 static int __init geneve_init_module(void)
1608 {
1609 int rc;
1610
1611 rc = register_pernet_subsys(&geneve_net_ops);
1612 if (rc)
1613 goto out1;
1614
1615 rc = register_netdevice_notifier(&geneve_notifier_block);
1616 if (rc)
1617 goto out2;
1618
1619 rc = rtnl_link_register(&geneve_link_ops);
1620 if (rc)
1621 goto out3;
1622
1623 return 0;
1624
1625 out3:
1626 unregister_netdevice_notifier(&geneve_notifier_block);
1627 out2:
1628 unregister_pernet_subsys(&geneve_net_ops);
1629 out1:
1630 return rc;
1631 }
1632 late_initcall(geneve_init_module);
1633
1634 static void __exit geneve_cleanup_module(void)
1635 {
1636 rtnl_link_unregister(&geneve_link_ops);
1637 unregister_netdevice_notifier(&geneve_notifier_block);
1638 unregister_pernet_subsys(&geneve_net_ops);
1639 }
1640 module_exit(geneve_cleanup_module);
1641
1642 MODULE_LICENSE("GPL");
1643 MODULE_VERSION(GENEVE_NETDEV_VER);
1644 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1645 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1646 MODULE_ALIAS_RTNL_LINK("geneve");
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