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[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 unsigned int geneve_net_id;
47
48 /* Pseudo network device */
49 struct geneve_dev {
50 struct hlist_node hlist; /* vni hash table */
51 struct net *net; /* netns for packet i/o */
52 struct net_device *dev; /* netdev for geneve tunnel */
53 struct ip_tunnel_info info;
54 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
55 #if IS_ENABLED(CONFIG_IPV6)
56 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
57 #endif
58 struct list_head next; /* geneve's per namespace list */
59 struct gro_cells gro_cells;
60 bool collect_md;
61 bool use_udp6_rx_checksums;
62 };
63
64 struct geneve_sock {
65 bool collect_md;
66 struct list_head list;
67 struct socket *sock;
68 struct rcu_head rcu;
69 int refcnt;
70 struct hlist_head vni_list[VNI_HASH_SIZE];
71 };
72
73 static inline __u32 geneve_net_vni_hash(u8 vni[3])
74 {
75 __u32 vnid;
76
77 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
78 return hash_32(vnid, VNI_HASH_BITS);
79 }
80
81 static __be64 vni_to_tunnel_id(const __u8 *vni)
82 {
83 #ifdef __BIG_ENDIAN
84 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
85 #else
86 return (__force __be64)(((__force u64)vni[0] << 40) |
87 ((__force u64)vni[1] << 48) |
88 ((__force u64)vni[2] << 56));
89 #endif
90 }
91
92 /* Convert 64 bit tunnel ID to 24 bit VNI. */
93 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
94 {
95 #ifdef __BIG_ENDIAN
96 vni[0] = (__force __u8)(tun_id >> 16);
97 vni[1] = (__force __u8)(tun_id >> 8);
98 vni[2] = (__force __u8)tun_id;
99 #else
100 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
101 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
102 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
103 #endif
104 }
105
106 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
107 {
108 #ifdef __BIG_ENDIAN
109 return (vni[0] == tun_id[2]) &&
110 (vni[1] == tun_id[1]) &&
111 (vni[2] == tun_id[0]);
112 #else
113 return !memcmp(vni, &tun_id[5], 3);
114 #endif
115 }
116
117 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
118 {
119 return gs->sock->sk->sk_family;
120 }
121
122 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
123 __be32 addr, u8 vni[])
124 {
125 struct hlist_head *vni_list_head;
126 struct geneve_dev *geneve;
127 __u32 hash;
128
129 /* Find the device for this VNI */
130 hash = geneve_net_vni_hash(vni);
131 vni_list_head = &gs->vni_list[hash];
132 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
133 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
134 addr == geneve->info.key.u.ipv4.dst)
135 return geneve;
136 }
137 return NULL;
138 }
139
140 #if IS_ENABLED(CONFIG_IPV6)
141 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
142 struct in6_addr addr6, u8 vni[])
143 {
144 struct hlist_head *vni_list_head;
145 struct geneve_dev *geneve;
146 __u32 hash;
147
148 /* Find the device for this VNI */
149 hash = geneve_net_vni_hash(vni);
150 vni_list_head = &gs->vni_list[hash];
151 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
152 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
153 ipv6_addr_equal(&addr6, &geneve->info.key.u.ipv6.dst))
154 return geneve;
155 }
156 return NULL;
157 }
158 #endif
159
160 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
161 {
162 return (struct genevehdr *)(udp_hdr(skb) + 1);
163 }
164
165 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
166 struct sk_buff *skb)
167 {
168 static u8 zero_vni[3];
169 u8 *vni;
170
171 if (geneve_get_sk_family(gs) == AF_INET) {
172 struct iphdr *iph;
173 __be32 addr;
174
175 iph = ip_hdr(skb); /* outer IP header... */
176
177 if (gs->collect_md) {
178 vni = zero_vni;
179 addr = 0;
180 } else {
181 vni = geneve_hdr(skb)->vni;
182 addr = iph->saddr;
183 }
184
185 return geneve_lookup(gs, addr, vni);
186 #if IS_ENABLED(CONFIG_IPV6)
187 } else if (geneve_get_sk_family(gs) == AF_INET6) {
188 static struct in6_addr zero_addr6;
189 struct ipv6hdr *ip6h;
190 struct in6_addr addr6;
191
192 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
193
194 if (gs->collect_md) {
195 vni = zero_vni;
196 addr6 = zero_addr6;
197 } else {
198 vni = geneve_hdr(skb)->vni;
199 addr6 = ip6h->saddr;
200 }
201
202 return geneve6_lookup(gs, addr6, vni);
203 #endif
204 }
205 return NULL;
206 }
207
208 /* geneve receive/decap routine */
209 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
210 struct sk_buff *skb)
211 {
212 struct genevehdr *gnvh = geneve_hdr(skb);
213 struct metadata_dst *tun_dst = NULL;
214 struct pcpu_sw_netstats *stats;
215 int err = 0;
216 void *oiph;
217
218 if (ip_tunnel_collect_metadata() || gs->collect_md) {
219 __be16 flags;
220
221 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
222 (gnvh->oam ? TUNNEL_OAM : 0) |
223 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
224
225 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
226 vni_to_tunnel_id(gnvh->vni),
227 gnvh->opt_len * 4);
228 if (!tun_dst)
229 goto drop;
230 /* Update tunnel dst according to Geneve options. */
231 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
232 gnvh->options, gnvh->opt_len * 4);
233 } else {
234 /* Drop packets w/ critical options,
235 * since we don't support any...
236 */
237 if (gnvh->critical)
238 goto drop;
239 }
240
241 skb_reset_mac_header(skb);
242 skb->protocol = eth_type_trans(skb, geneve->dev);
243 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
244
245 if (tun_dst)
246 skb_dst_set(skb, &tun_dst->dst);
247
248 /* Ignore packet loops (and multicast echo) */
249 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
250 goto drop;
251
252 oiph = skb_network_header(skb);
253 skb_reset_network_header(skb);
254
255 if (geneve_get_sk_family(gs) == AF_INET)
256 err = IP_ECN_decapsulate(oiph, skb);
257 #if IS_ENABLED(CONFIG_IPV6)
258 else
259 err = IP6_ECN_decapsulate(oiph, skb);
260 #endif
261
262 if (unlikely(err)) {
263 if (log_ecn_error) {
264 if (geneve_get_sk_family(gs) == AF_INET)
265 net_info_ratelimited("non-ECT from %pI4 "
266 "with TOS=%#x\n",
267 &((struct iphdr *)oiph)->saddr,
268 ((struct iphdr *)oiph)->tos);
269 #if IS_ENABLED(CONFIG_IPV6)
270 else
271 net_info_ratelimited("non-ECT from %pI6\n",
272 &((struct ipv6hdr *)oiph)->saddr);
273 #endif
274 }
275 if (err > 1) {
276 ++geneve->dev->stats.rx_frame_errors;
277 ++geneve->dev->stats.rx_errors;
278 goto drop;
279 }
280 }
281
282 stats = this_cpu_ptr(geneve->dev->tstats);
283 u64_stats_update_begin(&stats->syncp);
284 stats->rx_packets++;
285 stats->rx_bytes += skb->len;
286 u64_stats_update_end(&stats->syncp);
287
288 gro_cells_receive(&geneve->gro_cells, skb);
289 return;
290 drop:
291 /* Consume bad packet */
292 kfree_skb(skb);
293 }
294
295 /* Setup stats when device is created */
296 static int geneve_init(struct net_device *dev)
297 {
298 struct geneve_dev *geneve = netdev_priv(dev);
299 int err;
300
301 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
302 if (!dev->tstats)
303 return -ENOMEM;
304
305 err = gro_cells_init(&geneve->gro_cells, dev);
306 if (err) {
307 free_percpu(dev->tstats);
308 return err;
309 }
310
311 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
312 if (err) {
313 free_percpu(dev->tstats);
314 gro_cells_destroy(&geneve->gro_cells);
315 return err;
316 }
317 return 0;
318 }
319
320 static void geneve_uninit(struct net_device *dev)
321 {
322 struct geneve_dev *geneve = netdev_priv(dev);
323
324 dst_cache_destroy(&geneve->info.dst_cache);
325 gro_cells_destroy(&geneve->gro_cells);
326 free_percpu(dev->tstats);
327 }
328
329 /* Callback from net/ipv4/udp.c to receive packets */
330 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
331 {
332 struct genevehdr *geneveh;
333 struct geneve_dev *geneve;
334 struct geneve_sock *gs;
335 int opts_len;
336
337 /* Need Geneve and inner Ethernet header to be present */
338 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
339 goto drop;
340
341 /* Return packets with reserved bits set */
342 geneveh = geneve_hdr(skb);
343 if (unlikely(geneveh->ver != GENEVE_VER))
344 goto drop;
345
346 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
347 goto drop;
348
349 gs = rcu_dereference_sk_user_data(sk);
350 if (!gs)
351 goto drop;
352
353 geneve = geneve_lookup_skb(gs, skb);
354 if (!geneve)
355 goto drop;
356
357 opts_len = geneveh->opt_len * 4;
358 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
359 htons(ETH_P_TEB),
360 !net_eq(geneve->net, dev_net(geneve->dev))))
361 goto drop;
362
363 geneve_rx(geneve, gs, skb);
364 return 0;
365
366 drop:
367 /* Consume bad packet */
368 kfree_skb(skb);
369 return 0;
370 }
371
372 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
373 __be16 port, bool ipv6_rx_csum)
374 {
375 struct socket *sock;
376 struct udp_port_cfg udp_conf;
377 int err;
378
379 memset(&udp_conf, 0, sizeof(udp_conf));
380
381 if (ipv6) {
382 udp_conf.family = AF_INET6;
383 udp_conf.ipv6_v6only = 1;
384 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
385 } else {
386 udp_conf.family = AF_INET;
387 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
388 }
389
390 udp_conf.local_udp_port = port;
391
392 /* Open UDP socket */
393 err = udp_sock_create(net, &udp_conf, &sock);
394 if (err < 0)
395 return ERR_PTR(err);
396
397 return sock;
398 }
399
400 static int geneve_hlen(struct genevehdr *gh)
401 {
402 return sizeof(*gh) + gh->opt_len * 4;
403 }
404
405 static struct sk_buff **geneve_gro_receive(struct sock *sk,
406 struct sk_buff **head,
407 struct sk_buff *skb)
408 {
409 struct sk_buff *p, **pp = NULL;
410 struct genevehdr *gh, *gh2;
411 unsigned int hlen, gh_len, off_gnv;
412 const struct packet_offload *ptype;
413 __be16 type;
414 int flush = 1;
415
416 off_gnv = skb_gro_offset(skb);
417 hlen = off_gnv + sizeof(*gh);
418 gh = skb_gro_header_fast(skb, off_gnv);
419 if (skb_gro_header_hard(skb, hlen)) {
420 gh = skb_gro_header_slow(skb, hlen, off_gnv);
421 if (unlikely(!gh))
422 goto out;
423 }
424
425 if (gh->ver != GENEVE_VER || gh->oam)
426 goto out;
427 gh_len = geneve_hlen(gh);
428
429 hlen = off_gnv + gh_len;
430 if (skb_gro_header_hard(skb, hlen)) {
431 gh = skb_gro_header_slow(skb, hlen, off_gnv);
432 if (unlikely(!gh))
433 goto out;
434 }
435
436 for (p = *head; p; p = p->next) {
437 if (!NAPI_GRO_CB(p)->same_flow)
438 continue;
439
440 gh2 = (struct genevehdr *)(p->data + off_gnv);
441 if (gh->opt_len != gh2->opt_len ||
442 memcmp(gh, gh2, gh_len)) {
443 NAPI_GRO_CB(p)->same_flow = 0;
444 continue;
445 }
446 }
447
448 type = gh->proto_type;
449
450 rcu_read_lock();
451 ptype = gro_find_receive_by_type(type);
452 if (!ptype)
453 goto out_unlock;
454
455 skb_gro_pull(skb, gh_len);
456 skb_gro_postpull_rcsum(skb, gh, gh_len);
457 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
458 flush = 0;
459
460 out_unlock:
461 rcu_read_unlock();
462 out:
463 NAPI_GRO_CB(skb)->flush |= flush;
464
465 return pp;
466 }
467
468 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
469 int nhoff)
470 {
471 struct genevehdr *gh;
472 struct packet_offload *ptype;
473 __be16 type;
474 int gh_len;
475 int err = -ENOSYS;
476
477 gh = (struct genevehdr *)(skb->data + nhoff);
478 gh_len = geneve_hlen(gh);
479 type = gh->proto_type;
480
481 rcu_read_lock();
482 ptype = gro_find_complete_by_type(type);
483 if (ptype)
484 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
485
486 rcu_read_unlock();
487
488 skb_set_inner_mac_header(skb, nhoff + gh_len);
489
490 return err;
491 }
492
493 /* Create new listen socket if needed */
494 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
495 bool ipv6, bool ipv6_rx_csum)
496 {
497 struct geneve_net *gn = net_generic(net, geneve_net_id);
498 struct geneve_sock *gs;
499 struct socket *sock;
500 struct udp_tunnel_sock_cfg tunnel_cfg;
501 int h;
502
503 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
504 if (!gs)
505 return ERR_PTR(-ENOMEM);
506
507 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
508 if (IS_ERR(sock)) {
509 kfree(gs);
510 return ERR_CAST(sock);
511 }
512
513 gs->sock = sock;
514 gs->refcnt = 1;
515 for (h = 0; h < VNI_HASH_SIZE; ++h)
516 INIT_HLIST_HEAD(&gs->vni_list[h]);
517
518 /* Initialize the geneve udp offloads structure */
519 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
520
521 /* Mark socket as an encapsulation socket */
522 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
523 tunnel_cfg.sk_user_data = gs;
524 tunnel_cfg.encap_type = 1;
525 tunnel_cfg.gro_receive = geneve_gro_receive;
526 tunnel_cfg.gro_complete = geneve_gro_complete;
527 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
528 tunnel_cfg.encap_destroy = NULL;
529 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
530 list_add(&gs->list, &gn->sock_list);
531 return gs;
532 }
533
534 static void __geneve_sock_release(struct geneve_sock *gs)
535 {
536 if (!gs || --gs->refcnt)
537 return;
538
539 list_del(&gs->list);
540 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
541 udp_tunnel_sock_release(gs->sock);
542 kfree_rcu(gs, rcu);
543 }
544
545 static void geneve_sock_release(struct geneve_dev *geneve)
546 {
547 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
548 #if IS_ENABLED(CONFIG_IPV6)
549 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
550
551 rcu_assign_pointer(geneve->sock6, NULL);
552 #endif
553
554 rcu_assign_pointer(geneve->sock4, NULL);
555 synchronize_net();
556
557 __geneve_sock_release(gs4);
558 #if IS_ENABLED(CONFIG_IPV6)
559 __geneve_sock_release(gs6);
560 #endif
561 }
562
563 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
564 sa_family_t family,
565 __be16 dst_port)
566 {
567 struct geneve_sock *gs;
568
569 list_for_each_entry(gs, &gn->sock_list, list) {
570 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
571 geneve_get_sk_family(gs) == family) {
572 return gs;
573 }
574 }
575 return NULL;
576 }
577
578 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
579 {
580 struct net *net = geneve->net;
581 struct geneve_net *gn = net_generic(net, geneve_net_id);
582 struct geneve_sock *gs;
583 __u8 vni[3];
584 __u32 hash;
585
586 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
587 if (gs) {
588 gs->refcnt++;
589 goto out;
590 }
591
592 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
593 geneve->use_udp6_rx_checksums);
594 if (IS_ERR(gs))
595 return PTR_ERR(gs);
596
597 out:
598 gs->collect_md = geneve->collect_md;
599 #if IS_ENABLED(CONFIG_IPV6)
600 if (ipv6)
601 rcu_assign_pointer(geneve->sock6, gs);
602 else
603 #endif
604 rcu_assign_pointer(geneve->sock4, gs);
605
606 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
607 hash = geneve_net_vni_hash(vni);
608 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
609 return 0;
610 }
611
612 static int geneve_open(struct net_device *dev)
613 {
614 struct geneve_dev *geneve = netdev_priv(dev);
615 bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
616 bool metadata = geneve->collect_md;
617 int ret = 0;
618
619 #if IS_ENABLED(CONFIG_IPV6)
620 if (ipv6 || metadata)
621 ret = geneve_sock_add(geneve, true);
622 #endif
623 if (!ret && (!ipv6 || metadata))
624 ret = geneve_sock_add(geneve, false);
625 if (ret < 0)
626 geneve_sock_release(geneve);
627
628 return ret;
629 }
630
631 static int geneve_stop(struct net_device *dev)
632 {
633 struct geneve_dev *geneve = netdev_priv(dev);
634
635 if (!hlist_unhashed(&geneve->hlist))
636 hlist_del_rcu(&geneve->hlist);
637 geneve_sock_release(geneve);
638 return 0;
639 }
640
641 static void geneve_build_header(struct genevehdr *geneveh,
642 const struct ip_tunnel_info *info)
643 {
644 geneveh->ver = GENEVE_VER;
645 geneveh->opt_len = info->options_len / 4;
646 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
647 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
648 geneveh->rsvd1 = 0;
649 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
650 geneveh->proto_type = htons(ETH_P_TEB);
651 geneveh->rsvd2 = 0;
652
653 ip_tunnel_info_opts_get(geneveh->options, info);
654 }
655
656 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
657 const struct ip_tunnel_info *info,
658 bool xnet, int ip_hdr_len)
659 {
660 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
661 struct genevehdr *gnvh;
662 int min_headroom;
663 int err;
664
665 skb_reset_mac_header(skb);
666 skb_scrub_packet(skb, xnet);
667
668 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
669 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
670 err = skb_cow_head(skb, min_headroom);
671 if (unlikely(err))
672 goto free_dst;
673
674 err = udp_tunnel_handle_offloads(skb, udp_sum);
675 if (err)
676 goto free_dst;
677
678 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) +
679 info->options_len);
680 geneve_build_header(gnvh, info);
681 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
682 return 0;
683
684 free_dst:
685 dst_release(dst);
686 return err;
687 }
688
689 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
690 struct net_device *dev,
691 struct flowi4 *fl4,
692 const struct ip_tunnel_info *info)
693 {
694 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
695 struct geneve_dev *geneve = netdev_priv(dev);
696 struct dst_cache *dst_cache;
697 struct rtable *rt = NULL;
698 __u8 tos;
699
700 if (!rcu_dereference(geneve->sock4))
701 return ERR_PTR(-EIO);
702
703 memset(fl4, 0, sizeof(*fl4));
704 fl4->flowi4_mark = skb->mark;
705 fl4->flowi4_proto = IPPROTO_UDP;
706 fl4->daddr = info->key.u.ipv4.dst;
707 fl4->saddr = info->key.u.ipv4.src;
708
709 tos = info->key.tos;
710 if ((tos == 1) && !geneve->collect_md) {
711 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
712 use_cache = false;
713 }
714 fl4->flowi4_tos = RT_TOS(tos);
715
716 dst_cache = (struct dst_cache *)&info->dst_cache;
717 if (use_cache) {
718 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
719 if (rt)
720 return rt;
721 }
722 rt = ip_route_output_key(geneve->net, fl4);
723 if (IS_ERR(rt)) {
724 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
725 return ERR_PTR(-ENETUNREACH);
726 }
727 if (rt->dst.dev == dev) { /* is this necessary? */
728 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
729 ip_rt_put(rt);
730 return ERR_PTR(-ELOOP);
731 }
732 if (use_cache)
733 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
734 return rt;
735 }
736
737 #if IS_ENABLED(CONFIG_IPV6)
738 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
739 struct net_device *dev,
740 struct flowi6 *fl6,
741 const struct ip_tunnel_info *info)
742 {
743 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
744 struct geneve_dev *geneve = netdev_priv(dev);
745 struct dst_entry *dst = NULL;
746 struct dst_cache *dst_cache;
747 struct geneve_sock *gs6;
748 __u8 prio;
749
750 gs6 = rcu_dereference(geneve->sock6);
751 if (!gs6)
752 return ERR_PTR(-EIO);
753
754 memset(fl6, 0, sizeof(*fl6));
755 fl6->flowi6_mark = skb->mark;
756 fl6->flowi6_proto = IPPROTO_UDP;
757 fl6->daddr = info->key.u.ipv6.dst;
758 fl6->saddr = info->key.u.ipv6.src;
759 prio = info->key.tos;
760 if ((prio == 1) && !geneve->collect_md) {
761 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
762 use_cache = false;
763 }
764
765 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
766 info->key.label);
767 dst_cache = (struct dst_cache *)&info->dst_cache;
768 if (use_cache) {
769 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
770 if (dst)
771 return dst;
772 }
773 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
774 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
775 return ERR_PTR(-ENETUNREACH);
776 }
777 if (dst->dev == dev) { /* is this necessary? */
778 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
779 dst_release(dst);
780 return ERR_PTR(-ELOOP);
781 }
782
783 if (use_cache)
784 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
785 return dst;
786 }
787 #endif
788
789 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
790 struct geneve_dev *geneve,
791 const struct ip_tunnel_info *info)
792 {
793 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
794 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
795 const struct ip_tunnel_key *key = &info->key;
796 struct rtable *rt;
797 struct flowi4 fl4;
798 __u8 tos, ttl;
799 __be16 sport;
800 __be16 df;
801 int err;
802
803 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
804 if (IS_ERR(rt))
805 return PTR_ERR(rt);
806
807 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
808 if (geneve->collect_md) {
809 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
810 ttl = key->ttl;
811 } else {
812 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
813 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
814 }
815 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
816
817 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
818 if (unlikely(err))
819 return err;
820
821 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
822 tos, ttl, df, sport, geneve->info.key.tp_dst,
823 !net_eq(geneve->net, dev_net(geneve->dev)),
824 !(info->key.tun_flags & TUNNEL_CSUM));
825 return 0;
826 }
827
828 #if IS_ENABLED(CONFIG_IPV6)
829 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
830 struct geneve_dev *geneve,
831 const struct ip_tunnel_info *info)
832 {
833 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
834 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
835 const struct ip_tunnel_key *key = &info->key;
836 struct dst_entry *dst = NULL;
837 struct flowi6 fl6;
838 __u8 prio, ttl;
839 __be16 sport;
840 int err;
841
842 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
843 if (IS_ERR(dst))
844 return PTR_ERR(dst);
845
846 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
847 if (geneve->collect_md) {
848 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
849 ttl = key->ttl;
850 } else {
851 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
852 ip_hdr(skb), skb);
853 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
854 }
855 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
856 if (unlikely(err))
857 return err;
858
859 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
860 &fl6.saddr, &fl6.daddr, prio, ttl,
861 info->key.label, sport, geneve->info.key.tp_dst,
862 !(info->key.tun_flags & TUNNEL_CSUM));
863 return 0;
864 }
865 #endif
866
867 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
868 {
869 struct geneve_dev *geneve = netdev_priv(dev);
870 struct ip_tunnel_info *info = NULL;
871 int err;
872
873 if (geneve->collect_md) {
874 info = skb_tunnel_info(skb);
875 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
876 err = -EINVAL;
877 netdev_dbg(dev, "no tunnel metadata\n");
878 goto tx_error;
879 }
880 } else {
881 info = &geneve->info;
882 }
883
884 rcu_read_lock();
885 #if IS_ENABLED(CONFIG_IPV6)
886 if (info->mode & IP_TUNNEL_INFO_IPV6)
887 err = geneve6_xmit_skb(skb, dev, geneve, info);
888 else
889 #endif
890 err = geneve_xmit_skb(skb, dev, geneve, info);
891 rcu_read_unlock();
892
893 if (likely(!err))
894 return NETDEV_TX_OK;
895 tx_error:
896 dev_kfree_skb(skb);
897
898 if (err == -ELOOP)
899 dev->stats.collisions++;
900 else if (err == -ENETUNREACH)
901 dev->stats.tx_carrier_errors++;
902
903 dev->stats.tx_errors++;
904 return NETDEV_TX_OK;
905 }
906
907 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
908 {
909 /* Only possible if called internally, ndo_change_mtu path's new_mtu
910 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
911 */
912 if (new_mtu > dev->max_mtu)
913 new_mtu = dev->max_mtu;
914
915 dev->mtu = new_mtu;
916 return 0;
917 }
918
919 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
920 {
921 struct ip_tunnel_info *info = skb_tunnel_info(skb);
922 struct geneve_dev *geneve = netdev_priv(dev);
923
924 if (ip_tunnel_info_af(info) == AF_INET) {
925 struct rtable *rt;
926 struct flowi4 fl4;
927
928 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
929 if (IS_ERR(rt))
930 return PTR_ERR(rt);
931
932 ip_rt_put(rt);
933 info->key.u.ipv4.src = fl4.saddr;
934 #if IS_ENABLED(CONFIG_IPV6)
935 } else if (ip_tunnel_info_af(info) == AF_INET6) {
936 struct dst_entry *dst;
937 struct flowi6 fl6;
938
939 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
940 if (IS_ERR(dst))
941 return PTR_ERR(dst);
942
943 dst_release(dst);
944 info->key.u.ipv6.src = fl6.saddr;
945 #endif
946 } else {
947 return -EINVAL;
948 }
949
950 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
951 1, USHRT_MAX, true);
952 info->key.tp_dst = geneve->info.key.tp_dst;
953 return 0;
954 }
955
956 static const struct net_device_ops geneve_netdev_ops = {
957 .ndo_init = geneve_init,
958 .ndo_uninit = geneve_uninit,
959 .ndo_open = geneve_open,
960 .ndo_stop = geneve_stop,
961 .ndo_start_xmit = geneve_xmit,
962 .ndo_get_stats64 = ip_tunnel_get_stats64,
963 .ndo_change_mtu = geneve_change_mtu,
964 .ndo_validate_addr = eth_validate_addr,
965 .ndo_set_mac_address = eth_mac_addr,
966 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
967 };
968
969 static void geneve_get_drvinfo(struct net_device *dev,
970 struct ethtool_drvinfo *drvinfo)
971 {
972 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
973 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
974 }
975
976 static const struct ethtool_ops geneve_ethtool_ops = {
977 .get_drvinfo = geneve_get_drvinfo,
978 .get_link = ethtool_op_get_link,
979 };
980
981 /* Info for udev, that this is a virtual tunnel endpoint */
982 static struct device_type geneve_type = {
983 .name = "geneve",
984 };
985
986 /* Calls the ndo_udp_tunnel_add of the caller in order to
987 * supply the listening GENEVE udp ports. Callers are expected
988 * to implement the ndo_udp_tunnel_add.
989 */
990 static void geneve_push_rx_ports(struct net_device *dev)
991 {
992 struct net *net = dev_net(dev);
993 struct geneve_net *gn = net_generic(net, geneve_net_id);
994 struct geneve_sock *gs;
995
996 rcu_read_lock();
997 list_for_each_entry_rcu(gs, &gn->sock_list, list)
998 udp_tunnel_push_rx_port(dev, gs->sock,
999 UDP_TUNNEL_TYPE_GENEVE);
1000 rcu_read_unlock();
1001 }
1002
1003 /* Initialize the device structure. */
1004 static void geneve_setup(struct net_device *dev)
1005 {
1006 ether_setup(dev);
1007
1008 dev->netdev_ops = &geneve_netdev_ops;
1009 dev->ethtool_ops = &geneve_ethtool_ops;
1010 dev->destructor = free_netdev;
1011
1012 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1013
1014 dev->features |= NETIF_F_LLTX;
1015 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1016 dev->features |= NETIF_F_RXCSUM;
1017 dev->features |= NETIF_F_GSO_SOFTWARE;
1018
1019 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1020 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1021
1022 /* MTU range: 68 - (something less than 65535) */
1023 dev->min_mtu = ETH_MIN_MTU;
1024 /* The max_mtu calculation does not take account of GENEVE
1025 * options, to avoid excluding potentially valid
1026 * configurations. This will be further reduced by IPvX hdr size.
1027 */
1028 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1029
1030 netif_keep_dst(dev);
1031 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1032 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1033 eth_hw_addr_random(dev);
1034 }
1035
1036 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1037 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1038 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1039 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1040 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1041 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1042 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1043 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1044 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1045 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1046 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1047 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1048 };
1049
1050 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1051 {
1052 if (tb[IFLA_ADDRESS]) {
1053 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1054 return -EINVAL;
1055
1056 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1057 return -EADDRNOTAVAIL;
1058 }
1059
1060 if (!data)
1061 return -EINVAL;
1062
1063 if (data[IFLA_GENEVE_ID]) {
1064 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1065
1066 if (vni >= GENEVE_VID_MASK)
1067 return -ERANGE;
1068 }
1069
1070 return 0;
1071 }
1072
1073 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1074 const struct ip_tunnel_info *info,
1075 bool *tun_on_same_port,
1076 bool *tun_collect_md)
1077 {
1078 struct geneve_dev *geneve, *t = NULL;
1079
1080 *tun_on_same_port = false;
1081 *tun_collect_md = false;
1082 list_for_each_entry(geneve, &gn->geneve_list, next) {
1083 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1084 *tun_collect_md = geneve->collect_md;
1085 *tun_on_same_port = true;
1086 }
1087 if (info->key.tun_id == geneve->info.key.tun_id &&
1088 info->key.tp_dst == geneve->info.key.tp_dst &&
1089 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1090 t = geneve;
1091 }
1092 return t;
1093 }
1094
1095 static bool is_all_zero(const u8 *fp, size_t size)
1096 {
1097 int i;
1098
1099 for (i = 0; i < size; i++)
1100 if (fp[i])
1101 return false;
1102 return true;
1103 }
1104
1105 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1106 {
1107 if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1108 info->key.ttl || info->key.label || info->key.tp_src ||
1109 !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1110 return false;
1111 else
1112 return true;
1113 }
1114
1115 static int geneve_configure(struct net *net, struct net_device *dev,
1116 const struct ip_tunnel_info *info,
1117 bool metadata, bool ipv6_rx_csum)
1118 {
1119 struct geneve_net *gn = net_generic(net, geneve_net_id);
1120 struct geneve_dev *t, *geneve = netdev_priv(dev);
1121 bool tun_collect_md, tun_on_same_port;
1122 int err, encap_len;
1123
1124 if (metadata && !is_tnl_info_zero(info))
1125 return -EINVAL;
1126
1127 geneve->net = net;
1128 geneve->dev = dev;
1129
1130 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1131 if (t)
1132 return -EBUSY;
1133
1134 /* make enough headroom for basic scenario */
1135 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1136 if (ip_tunnel_info_af(info) == AF_INET) {
1137 encap_len += sizeof(struct iphdr);
1138 dev->max_mtu -= sizeof(struct iphdr);
1139 } else {
1140 encap_len += sizeof(struct ipv6hdr);
1141 dev->max_mtu -= sizeof(struct ipv6hdr);
1142 }
1143 dev->needed_headroom = encap_len + ETH_HLEN;
1144
1145 if (metadata) {
1146 if (tun_on_same_port)
1147 return -EPERM;
1148 } else {
1149 if (tun_collect_md)
1150 return -EPERM;
1151 }
1152
1153 dst_cache_reset(&geneve->info.dst_cache);
1154 geneve->info = *info;
1155 geneve->collect_md = metadata;
1156 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1157
1158 err = register_netdevice(dev);
1159 if (err)
1160 return err;
1161
1162 list_add(&geneve->next, &gn->geneve_list);
1163 return 0;
1164 }
1165
1166 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1167 {
1168 memset(info, 0, sizeof(*info));
1169 info->key.tp_dst = htons(dst_port);
1170 }
1171
1172 static int geneve_newlink(struct net *net, struct net_device *dev,
1173 struct nlattr *tb[], struct nlattr *data[])
1174 {
1175 bool use_udp6_rx_checksums = false;
1176 struct ip_tunnel_info info;
1177 bool metadata = false;
1178
1179 init_tnl_info(&info, GENEVE_UDP_PORT);
1180
1181 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1182 return -EINVAL;
1183
1184 if (data[IFLA_GENEVE_REMOTE]) {
1185 info.key.u.ipv4.dst =
1186 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1187
1188 if (IN_MULTICAST(ntohl(info.key.u.ipv4.dst))) {
1189 netdev_dbg(dev, "multicast remote is unsupported\n");
1190 return -EINVAL;
1191 }
1192 }
1193
1194 if (data[IFLA_GENEVE_REMOTE6]) {
1195 #if IS_ENABLED(CONFIG_IPV6)
1196 info.mode = IP_TUNNEL_INFO_IPV6;
1197 info.key.u.ipv6.dst =
1198 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1199
1200 if (ipv6_addr_type(&info.key.u.ipv6.dst) &
1201 IPV6_ADDR_LINKLOCAL) {
1202 netdev_dbg(dev, "link-local remote is unsupported\n");
1203 return -EINVAL;
1204 }
1205 if (ipv6_addr_is_multicast(&info.key.u.ipv6.dst)) {
1206 netdev_dbg(dev, "multicast remote is unsupported\n");
1207 return -EINVAL;
1208 }
1209 info.key.tun_flags |= TUNNEL_CSUM;
1210 use_udp6_rx_checksums = true;
1211 #else
1212 return -EPFNOSUPPORT;
1213 #endif
1214 }
1215
1216 if (data[IFLA_GENEVE_ID]) {
1217 __u32 vni;
1218 __u8 tvni[3];
1219
1220 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1221 tvni[0] = (vni & 0x00ff0000) >> 16;
1222 tvni[1] = (vni & 0x0000ff00) >> 8;
1223 tvni[2] = vni & 0x000000ff;
1224
1225 info.key.tun_id = vni_to_tunnel_id(tvni);
1226 }
1227 if (data[IFLA_GENEVE_TTL])
1228 info.key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1229
1230 if (data[IFLA_GENEVE_TOS])
1231 info.key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1232
1233 if (data[IFLA_GENEVE_LABEL]) {
1234 info.key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1235 IPV6_FLOWLABEL_MASK;
1236 if (info.key.label && (!(info.mode & IP_TUNNEL_INFO_IPV6)))
1237 return -EINVAL;
1238 }
1239
1240 if (data[IFLA_GENEVE_PORT])
1241 info.key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1242
1243 if (data[IFLA_GENEVE_COLLECT_METADATA])
1244 metadata = true;
1245
1246 if (data[IFLA_GENEVE_UDP_CSUM] &&
1247 nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1248 info.key.tun_flags |= TUNNEL_CSUM;
1249
1250 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1251 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1252 info.key.tun_flags &= ~TUNNEL_CSUM;
1253
1254 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1255 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1256 use_udp6_rx_checksums = false;
1257
1258 return geneve_configure(net, dev, &info, metadata, use_udp6_rx_checksums);
1259 }
1260
1261 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1262 {
1263 struct geneve_dev *geneve = netdev_priv(dev);
1264
1265 list_del(&geneve->next);
1266 unregister_netdevice_queue(dev, head);
1267 }
1268
1269 static size_t geneve_get_size(const struct net_device *dev)
1270 {
1271 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1272 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1273 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1274 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1275 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1276 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1277 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1278 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1279 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1280 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1281 0;
1282 }
1283
1284 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1285 {
1286 struct geneve_dev *geneve = netdev_priv(dev);
1287 struct ip_tunnel_info *info = &geneve->info;
1288 __u8 tmp_vni[3];
1289 __u32 vni;
1290
1291 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1292 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1293 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1294 goto nla_put_failure;
1295
1296 if (rtnl_dereference(geneve->sock4)) {
1297 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1298 info->key.u.ipv4.dst))
1299 goto nla_put_failure;
1300
1301 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1302 !!(info->key.tun_flags & TUNNEL_CSUM)))
1303 goto nla_put_failure;
1304
1305 }
1306
1307 #if IS_ENABLED(CONFIG_IPV6)
1308 if (rtnl_dereference(geneve->sock6)) {
1309 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1310 &info->key.u.ipv6.dst))
1311 goto nla_put_failure;
1312
1313 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1314 !(info->key.tun_flags & TUNNEL_CSUM)))
1315 goto nla_put_failure;
1316
1317 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1318 !geneve->use_udp6_rx_checksums))
1319 goto nla_put_failure;
1320 }
1321 #endif
1322
1323 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1324 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1325 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1326 goto nla_put_failure;
1327
1328 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1329 goto nla_put_failure;
1330
1331 if (geneve->collect_md) {
1332 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1333 goto nla_put_failure;
1334 }
1335 return 0;
1336
1337 nla_put_failure:
1338 return -EMSGSIZE;
1339 }
1340
1341 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1342 .kind = "geneve",
1343 .maxtype = IFLA_GENEVE_MAX,
1344 .policy = geneve_policy,
1345 .priv_size = sizeof(struct geneve_dev),
1346 .setup = geneve_setup,
1347 .validate = geneve_validate,
1348 .newlink = geneve_newlink,
1349 .dellink = geneve_dellink,
1350 .get_size = geneve_get_size,
1351 .fill_info = geneve_fill_info,
1352 };
1353
1354 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1355 u8 name_assign_type, u16 dst_port)
1356 {
1357 struct nlattr *tb[IFLA_MAX + 1];
1358 struct ip_tunnel_info info;
1359 struct net_device *dev;
1360 LIST_HEAD(list_kill);
1361 int err;
1362
1363 memset(tb, 0, sizeof(tb));
1364 dev = rtnl_create_link(net, name, name_assign_type,
1365 &geneve_link_ops, tb);
1366 if (IS_ERR(dev))
1367 return dev;
1368
1369 init_tnl_info(&info, dst_port);
1370 err = geneve_configure(net, dev, &info, true, true);
1371 if (err) {
1372 free_netdev(dev);
1373 return ERR_PTR(err);
1374 }
1375
1376 /* openvswitch users expect packet sizes to be unrestricted,
1377 * so set the largest MTU we can.
1378 */
1379 err = geneve_change_mtu(dev, IP_MAX_MTU);
1380 if (err)
1381 goto err;
1382
1383 err = rtnl_configure_link(dev, NULL);
1384 if (err < 0)
1385 goto err;
1386
1387 return dev;
1388 err:
1389 geneve_dellink(dev, &list_kill);
1390 unregister_netdevice_many(&list_kill);
1391 return ERR_PTR(err);
1392 }
1393 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1394
1395 static int geneve_netdevice_event(struct notifier_block *unused,
1396 unsigned long event, void *ptr)
1397 {
1398 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1399
1400 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1401 geneve_push_rx_ports(dev);
1402
1403 return NOTIFY_DONE;
1404 }
1405
1406 static struct notifier_block geneve_notifier_block __read_mostly = {
1407 .notifier_call = geneve_netdevice_event,
1408 };
1409
1410 static __net_init int geneve_init_net(struct net *net)
1411 {
1412 struct geneve_net *gn = net_generic(net, geneve_net_id);
1413
1414 INIT_LIST_HEAD(&gn->geneve_list);
1415 INIT_LIST_HEAD(&gn->sock_list);
1416 return 0;
1417 }
1418
1419 static void __net_exit geneve_exit_net(struct net *net)
1420 {
1421 struct geneve_net *gn = net_generic(net, geneve_net_id);
1422 struct geneve_dev *geneve, *next;
1423 struct net_device *dev, *aux;
1424 LIST_HEAD(list);
1425
1426 rtnl_lock();
1427
1428 /* gather any geneve devices that were moved into this ns */
1429 for_each_netdev_safe(net, dev, aux)
1430 if (dev->rtnl_link_ops == &geneve_link_ops)
1431 unregister_netdevice_queue(dev, &list);
1432
1433 /* now gather any other geneve devices that were created in this ns */
1434 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1435 /* If geneve->dev is in the same netns, it was already added
1436 * to the list by the previous loop.
1437 */
1438 if (!net_eq(dev_net(geneve->dev), net))
1439 unregister_netdevice_queue(geneve->dev, &list);
1440 }
1441
1442 /* unregister the devices gathered above */
1443 unregister_netdevice_many(&list);
1444 rtnl_unlock();
1445 }
1446
1447 static struct pernet_operations geneve_net_ops = {
1448 .init = geneve_init_net,
1449 .exit = geneve_exit_net,
1450 .id = &geneve_net_id,
1451 .size = sizeof(struct geneve_net),
1452 };
1453
1454 static int __init geneve_init_module(void)
1455 {
1456 int rc;
1457
1458 rc = register_pernet_subsys(&geneve_net_ops);
1459 if (rc)
1460 goto out1;
1461
1462 rc = register_netdevice_notifier(&geneve_notifier_block);
1463 if (rc)
1464 goto out2;
1465
1466 rc = rtnl_link_register(&geneve_link_ops);
1467 if (rc)
1468 goto out3;
1469
1470 return 0;
1471 out3:
1472 unregister_netdevice_notifier(&geneve_notifier_block);
1473 out2:
1474 unregister_pernet_subsys(&geneve_net_ops);
1475 out1:
1476 return rc;
1477 }
1478 late_initcall(geneve_init_module);
1479
1480 static void __exit geneve_cleanup_module(void)
1481 {
1482 rtnl_link_unregister(&geneve_link_ops);
1483 unregister_netdevice_notifier(&geneve_notifier_block);
1484 unregister_pernet_subsys(&geneve_net_ops);
1485 }
1486 module_exit(geneve_cleanup_module);
1487
1488 MODULE_LICENSE("GPL");
1489 MODULE_VERSION(GENEVE_NETDEV_VER);
1490 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1491 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1492 MODULE_ALIAS_RTNL_LINK("geneve");