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