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defconfig: exynos9610: Re-add dropped Wi-Fi AP options lost
[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 struct geneve_dev_node {
49 struct hlist_node hlist;
50 struct geneve_dev *geneve;
51 };
52
53 /* Pseudo network device */
54 struct geneve_dev {
55 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
56 #if IS_ENABLED(CONFIG_IPV6)
57 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
58 #endif
59 struct net *net; /* netns for packet i/o */
60 struct net_device *dev; /* netdev for geneve tunnel */
61 struct ip_tunnel_info info;
62 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
63 #if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
65 #endif
66 struct list_head next; /* geneve's per namespace list */
67 struct gro_cells gro_cells;
68 bool collect_md;
69 bool use_udp6_rx_checksums;
70 };
71
72 struct geneve_sock {
73 bool collect_md;
74 struct list_head list;
75 struct socket *sock;
76 struct rcu_head rcu;
77 int refcnt;
78 struct hlist_head vni_list[VNI_HASH_SIZE];
79 };
80
81 static inline __u32 geneve_net_vni_hash(u8 vni[3])
82 {
83 __u32 vnid;
84
85 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
86 return hash_32(vnid, VNI_HASH_BITS);
87 }
88
89 static __be64 vni_to_tunnel_id(const __u8 *vni)
90 {
91 #ifdef __BIG_ENDIAN
92 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
93 #else
94 return (__force __be64)(((__force u64)vni[0] << 40) |
95 ((__force u64)vni[1] << 48) |
96 ((__force u64)vni[2] << 56));
97 #endif
98 }
99
100 /* Convert 64 bit tunnel ID to 24 bit VNI. */
101 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
102 {
103 #ifdef __BIG_ENDIAN
104 vni[0] = (__force __u8)(tun_id >> 16);
105 vni[1] = (__force __u8)(tun_id >> 8);
106 vni[2] = (__force __u8)tun_id;
107 #else
108 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
109 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
110 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
111 #endif
112 }
113
114 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
115 {
116 return !memcmp(vni, &tun_id[5], 3);
117 }
118
119 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
120 {
121 return gs->sock->sk->sk_family;
122 }
123
124 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
125 __be32 addr, u8 vni[])
126 {
127 struct hlist_head *vni_list_head;
128 struct geneve_dev_node *node;
129 __u32 hash;
130
131 /* Find the device for this VNI */
132 hash = geneve_net_vni_hash(vni);
133 vni_list_head = &gs->vni_list[hash];
134 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
135 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
136 addr == node->geneve->info.key.u.ipv4.dst)
137 return node->geneve;
138 }
139 return NULL;
140 }
141
142 #if IS_ENABLED(CONFIG_IPV6)
143 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
144 struct in6_addr addr6, u8 vni[])
145 {
146 struct hlist_head *vni_list_head;
147 struct geneve_dev_node *node;
148 __u32 hash;
149
150 /* Find the device for this VNI */
151 hash = geneve_net_vni_hash(vni);
152 vni_list_head = &gs->vni_list[hash];
153 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
154 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
155 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
156 return node->geneve;
157 }
158 return NULL;
159 }
160 #endif
161
162 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
163 {
164 return (struct genevehdr *)(udp_hdr(skb) + 1);
165 }
166
167 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
168 struct sk_buff *skb)
169 {
170 static u8 zero_vni[3];
171 u8 *vni;
172
173 if (geneve_get_sk_family(gs) == AF_INET) {
174 struct iphdr *iph;
175 __be32 addr;
176
177 iph = ip_hdr(skb); /* outer IP header... */
178
179 if (gs->collect_md) {
180 vni = zero_vni;
181 addr = 0;
182 } else {
183 vni = geneve_hdr(skb)->vni;
184 addr = iph->saddr;
185 }
186
187 return geneve_lookup(gs, addr, vni);
188 #if IS_ENABLED(CONFIG_IPV6)
189 } else if (geneve_get_sk_family(gs) == AF_INET6) {
190 static struct in6_addr zero_addr6;
191 struct ipv6hdr *ip6h;
192 struct in6_addr addr6;
193
194 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
195
196 if (gs->collect_md) {
197 vni = zero_vni;
198 addr6 = zero_addr6;
199 } else {
200 vni = geneve_hdr(skb)->vni;
201 addr6 = ip6h->saddr;
202 }
203
204 return geneve6_lookup(gs, addr6, vni);
205 #endif
206 }
207 return NULL;
208 }
209
210 /* geneve receive/decap routine */
211 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
212 struct sk_buff *skb)
213 {
214 struct genevehdr *gnvh = geneve_hdr(skb);
215 struct metadata_dst *tun_dst = NULL;
216 struct pcpu_sw_netstats *stats;
217 unsigned int len;
218 int err = 0;
219 void *oiph;
220
221 if (ip_tunnel_collect_metadata() || gs->collect_md) {
222 __be16 flags;
223
224 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
225 (gnvh->oam ? TUNNEL_OAM : 0) |
226 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
227
228 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
229 vni_to_tunnel_id(gnvh->vni),
230 gnvh->opt_len * 4);
231 if (!tun_dst) {
232 geneve->dev->stats.rx_dropped++;
233 goto drop;
234 }
235 /* Update tunnel dst according to Geneve options. */
236 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
237 gnvh->options, gnvh->opt_len * 4);
238 } else {
239 /* Drop packets w/ critical options,
240 * since we don't support any...
241 */
242 if (gnvh->critical) {
243 geneve->dev->stats.rx_frame_errors++;
244 geneve->dev->stats.rx_errors++;
245 goto drop;
246 }
247 }
248
249 skb_reset_mac_header(skb);
250 skb->protocol = eth_type_trans(skb, geneve->dev);
251 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
252
253 if (tun_dst)
254 skb_dst_set(skb, &tun_dst->dst);
255
256 /* Ignore packet loops (and multicast echo) */
257 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
258 geneve->dev->stats.rx_errors++;
259 goto drop;
260 }
261
262 oiph = skb_network_header(skb);
263 skb_reset_network_header(skb);
264
265 if (geneve_get_sk_family(gs) == AF_INET)
266 err = IP_ECN_decapsulate(oiph, skb);
267 #if IS_ENABLED(CONFIG_IPV6)
268 else
269 err = IP6_ECN_decapsulate(oiph, skb);
270 #endif
271
272 if (unlikely(err)) {
273 if (log_ecn_error) {
274 if (geneve_get_sk_family(gs) == AF_INET)
275 net_info_ratelimited("non-ECT from %pI4 "
276 "with TOS=%#x\n",
277 &((struct iphdr *)oiph)->saddr,
278 ((struct iphdr *)oiph)->tos);
279 #if IS_ENABLED(CONFIG_IPV6)
280 else
281 net_info_ratelimited("non-ECT from %pI6\n",
282 &((struct ipv6hdr *)oiph)->saddr);
283 #endif
284 }
285 if (err > 1) {
286 ++geneve->dev->stats.rx_frame_errors;
287 ++geneve->dev->stats.rx_errors;
288 goto drop;
289 }
290 }
291
292 len = skb->len;
293 err = gro_cells_receive(&geneve->gro_cells, skb);
294 if (likely(err == NET_RX_SUCCESS)) {
295 stats = this_cpu_ptr(geneve->dev->tstats);
296 u64_stats_update_begin(&stats->syncp);
297 stats->rx_packets++;
298 stats->rx_bytes += len;
299 u64_stats_update_end(&stats->syncp);
300 }
301 return;
302 drop:
303 /* Consume bad packet */
304 kfree_skb(skb);
305 }
306
307 /* Setup stats when device is created */
308 static int geneve_init(struct net_device *dev)
309 {
310 struct geneve_dev *geneve = netdev_priv(dev);
311 int err;
312
313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
314 if (!dev->tstats)
315 return -ENOMEM;
316
317 err = gro_cells_init(&geneve->gro_cells, dev);
318 if (err) {
319 free_percpu(dev->tstats);
320 return err;
321 }
322
323 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
324 if (err) {
325 free_percpu(dev->tstats);
326 gro_cells_destroy(&geneve->gro_cells);
327 return err;
328 }
329 return 0;
330 }
331
332 static void geneve_uninit(struct net_device *dev)
333 {
334 struct geneve_dev *geneve = netdev_priv(dev);
335
336 dst_cache_destroy(&geneve->info.dst_cache);
337 gro_cells_destroy(&geneve->gro_cells);
338 free_percpu(dev->tstats);
339 }
340
341 /* Callback from net/ipv4/udp.c to receive packets */
342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
343 {
344 struct genevehdr *geneveh;
345 struct geneve_dev *geneve;
346 struct geneve_sock *gs;
347 int opts_len;
348
349 /* Need UDP and Geneve header to be present */
350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
351 goto drop;
352
353 /* Return packets with reserved bits set */
354 geneveh = geneve_hdr(skb);
355 if (unlikely(geneveh->ver != GENEVE_VER))
356 goto drop;
357
358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
359 goto drop;
360
361 gs = rcu_dereference_sk_user_data(sk);
362 if (!gs)
363 goto drop;
364
365 geneve = geneve_lookup_skb(gs, skb);
366 if (!geneve)
367 goto drop;
368
369 opts_len = geneveh->opt_len * 4;
370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
371 htons(ETH_P_TEB),
372 !net_eq(geneve->net, dev_net(geneve->dev)))) {
373 geneve->dev->stats.rx_dropped++;
374 goto drop;
375 }
376
377 geneve_rx(geneve, gs, skb);
378 return 0;
379
380 drop:
381 /* Consume bad packet */
382 kfree_skb(skb);
383 return 0;
384 }
385
386 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
387 __be16 port, bool ipv6_rx_csum)
388 {
389 struct socket *sock;
390 struct udp_port_cfg udp_conf;
391 int err;
392
393 memset(&udp_conf, 0, sizeof(udp_conf));
394
395 if (ipv6) {
396 udp_conf.family = AF_INET6;
397 udp_conf.ipv6_v6only = 1;
398 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
399 } else {
400 udp_conf.family = AF_INET;
401 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
402 }
403
404 udp_conf.local_udp_port = port;
405
406 /* Open UDP socket */
407 err = udp_sock_create(net, &udp_conf, &sock);
408 if (err < 0)
409 return ERR_PTR(err);
410
411 return sock;
412 }
413
414 static int geneve_hlen(struct genevehdr *gh)
415 {
416 return sizeof(*gh) + gh->opt_len * 4;
417 }
418
419 static struct sk_buff **geneve_gro_receive(struct sock *sk,
420 struct sk_buff **head,
421 struct sk_buff *skb)
422 {
423 struct sk_buff *p, **pp = NULL;
424 struct genevehdr *gh, *gh2;
425 unsigned int hlen, gh_len, off_gnv;
426 const struct packet_offload *ptype;
427 __be16 type;
428 int flush = 1;
429
430 off_gnv = skb_gro_offset(skb);
431 hlen = off_gnv + sizeof(*gh);
432 gh = skb_gro_header_fast(skb, off_gnv);
433 if (skb_gro_header_hard(skb, hlen)) {
434 gh = skb_gro_header_slow(skb, hlen, off_gnv);
435 if (unlikely(!gh))
436 goto out;
437 }
438
439 if (gh->ver != GENEVE_VER || gh->oam)
440 goto out;
441 gh_len = geneve_hlen(gh);
442
443 hlen = off_gnv + gh_len;
444 if (skb_gro_header_hard(skb, hlen)) {
445 gh = skb_gro_header_slow(skb, hlen, off_gnv);
446 if (unlikely(!gh))
447 goto out;
448 }
449
450 for (p = *head; p; p = p->next) {
451 if (!NAPI_GRO_CB(p)->same_flow)
452 continue;
453
454 gh2 = (struct genevehdr *)(p->data + off_gnv);
455 if (gh->opt_len != gh2->opt_len ||
456 memcmp(gh, gh2, gh_len)) {
457 NAPI_GRO_CB(p)->same_flow = 0;
458 continue;
459 }
460 }
461
462 type = gh->proto_type;
463
464 rcu_read_lock();
465 ptype = gro_find_receive_by_type(type);
466 if (!ptype)
467 goto out_unlock;
468
469 skb_gro_pull(skb, gh_len);
470 skb_gro_postpull_rcsum(skb, gh, gh_len);
471 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
472 flush = 0;
473
474 out_unlock:
475 rcu_read_unlock();
476 out:
477 skb_gro_flush_final(skb, pp, flush);
478
479 return pp;
480 }
481
482 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
483 int nhoff)
484 {
485 struct genevehdr *gh;
486 struct packet_offload *ptype;
487 __be16 type;
488 int gh_len;
489 int err = -ENOSYS;
490
491 gh = (struct genevehdr *)(skb->data + nhoff);
492 gh_len = geneve_hlen(gh);
493 type = gh->proto_type;
494
495 rcu_read_lock();
496 ptype = gro_find_complete_by_type(type);
497 if (ptype)
498 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
499
500 rcu_read_unlock();
501
502 skb_set_inner_mac_header(skb, nhoff + gh_len);
503
504 return err;
505 }
506
507 /* Create new listen socket if needed */
508 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
509 bool ipv6, bool ipv6_rx_csum)
510 {
511 struct geneve_net *gn = net_generic(net, geneve_net_id);
512 struct geneve_sock *gs;
513 struct socket *sock;
514 struct udp_tunnel_sock_cfg tunnel_cfg;
515 int h;
516
517 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
518 if (!gs)
519 return ERR_PTR(-ENOMEM);
520
521 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
522 if (IS_ERR(sock)) {
523 kfree(gs);
524 return ERR_CAST(sock);
525 }
526
527 gs->sock = sock;
528 gs->refcnt = 1;
529 for (h = 0; h < VNI_HASH_SIZE; ++h)
530 INIT_HLIST_HEAD(&gs->vni_list[h]);
531
532 /* Initialize the geneve udp offloads structure */
533 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
534
535 /* Mark socket as an encapsulation socket */
536 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
537 tunnel_cfg.sk_user_data = gs;
538 tunnel_cfg.encap_type = 1;
539 tunnel_cfg.gro_receive = geneve_gro_receive;
540 tunnel_cfg.gro_complete = geneve_gro_complete;
541 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
542 tunnel_cfg.encap_destroy = NULL;
543 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
544 list_add(&gs->list, &gn->sock_list);
545 return gs;
546 }
547
548 static void __geneve_sock_release(struct geneve_sock *gs)
549 {
550 if (!gs || --gs->refcnt)
551 return;
552
553 list_del(&gs->list);
554 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
555 udp_tunnel_sock_release(gs->sock);
556 kfree_rcu(gs, rcu);
557 }
558
559 static void geneve_sock_release(struct geneve_dev *geneve)
560 {
561 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
562 #if IS_ENABLED(CONFIG_IPV6)
563 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
564
565 rcu_assign_pointer(geneve->sock6, NULL);
566 #endif
567
568 rcu_assign_pointer(geneve->sock4, NULL);
569 synchronize_net();
570
571 __geneve_sock_release(gs4);
572 #if IS_ENABLED(CONFIG_IPV6)
573 __geneve_sock_release(gs6);
574 #endif
575 }
576
577 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
578 sa_family_t family,
579 __be16 dst_port)
580 {
581 struct geneve_sock *gs;
582
583 list_for_each_entry(gs, &gn->sock_list, list) {
584 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
585 geneve_get_sk_family(gs) == family) {
586 return gs;
587 }
588 }
589 return NULL;
590 }
591
592 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
593 {
594 struct net *net = geneve->net;
595 struct geneve_net *gn = net_generic(net, geneve_net_id);
596 struct geneve_dev_node *node;
597 struct geneve_sock *gs;
598 __u8 vni[3];
599 __u32 hash;
600
601 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
602 if (gs) {
603 gs->refcnt++;
604 goto out;
605 }
606
607 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
608 geneve->use_udp6_rx_checksums);
609 if (IS_ERR(gs))
610 return PTR_ERR(gs);
611
612 out:
613 gs->collect_md = geneve->collect_md;
614 #if IS_ENABLED(CONFIG_IPV6)
615 if (ipv6) {
616 rcu_assign_pointer(geneve->sock6, gs);
617 node = &geneve->hlist6;
618 } else
619 #endif
620 {
621 rcu_assign_pointer(geneve->sock4, gs);
622 node = &geneve->hlist4;
623 }
624 node->geneve = geneve;
625
626 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
627 hash = geneve_net_vni_hash(vni);
628 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
629 return 0;
630 }
631
632 static int geneve_open(struct net_device *dev)
633 {
634 struct geneve_dev *geneve = netdev_priv(dev);
635 bool metadata = geneve->collect_md;
636 bool ipv4, ipv6;
637 int ret = 0;
638
639 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
640 ipv4 = !ipv6 || metadata;
641 #if IS_ENABLED(CONFIG_IPV6)
642 if (ipv6) {
643 ret = geneve_sock_add(geneve, true);
644 if (ret < 0 && ret != -EAFNOSUPPORT)
645 ipv4 = false;
646 }
647 #endif
648 if (ipv4)
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 hlist_del_init_rcu(&geneve->hlist4.hlist);
661 #if IS_ENABLED(CONFIG_IPV6)
662 hlist_del_init_rcu(&geneve->hlist6.hlist);
663 #endif
664 geneve_sock_release(geneve);
665 return 0;
666 }
667
668 static void geneve_build_header(struct genevehdr *geneveh,
669 const struct ip_tunnel_info *info)
670 {
671 geneveh->ver = GENEVE_VER;
672 geneveh->opt_len = info->options_len / 4;
673 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
674 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
675 geneveh->rsvd1 = 0;
676 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
677 geneveh->proto_type = htons(ETH_P_TEB);
678 geneveh->rsvd2 = 0;
679
680 ip_tunnel_info_opts_get(geneveh->options, info);
681 }
682
683 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
684 const struct ip_tunnel_info *info,
685 bool xnet, int ip_hdr_len)
686 {
687 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
688 struct genevehdr *gnvh;
689 int min_headroom;
690 int err;
691
692 skb_reset_mac_header(skb);
693 skb_scrub_packet(skb, xnet);
694
695 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
696 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
697 err = skb_cow_head(skb, min_headroom);
698 if (unlikely(err))
699 goto free_dst;
700
701 err = udp_tunnel_handle_offloads(skb, udp_sum);
702 if (err)
703 goto free_dst;
704
705 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
706 geneve_build_header(gnvh, info);
707 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
708 return 0;
709
710 free_dst:
711 dst_release(dst);
712 return err;
713 }
714
715 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
716 struct net_device *dev,
717 struct geneve_sock *gs4,
718 struct flowi4 *fl4,
719 const struct ip_tunnel_info *info)
720 {
721 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
722 struct geneve_dev *geneve = netdev_priv(dev);
723 struct dst_cache *dst_cache;
724 struct rtable *rt = NULL;
725 __u8 tos;
726
727 if (!gs4)
728 return ERR_PTR(-EIO);
729
730 memset(fl4, 0, sizeof(*fl4));
731 fl4->flowi4_mark = skb->mark;
732 fl4->flowi4_proto = IPPROTO_UDP;
733 fl4->daddr = info->key.u.ipv4.dst;
734 fl4->saddr = info->key.u.ipv4.src;
735
736 tos = info->key.tos;
737 if ((tos == 1) && !geneve->collect_md) {
738 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
739 use_cache = false;
740 }
741 fl4->flowi4_tos = RT_TOS(tos);
742
743 dst_cache = (struct dst_cache *)&info->dst_cache;
744 if (use_cache) {
745 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
746 if (rt)
747 return rt;
748 }
749 rt = ip_route_output_key(geneve->net, fl4);
750 if (IS_ERR(rt)) {
751 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
752 return ERR_PTR(-ENETUNREACH);
753 }
754 if (rt->dst.dev == dev) { /* is this necessary? */
755 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
756 ip_rt_put(rt);
757 return ERR_PTR(-ELOOP);
758 }
759 if (use_cache)
760 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
761 return rt;
762 }
763
764 #if IS_ENABLED(CONFIG_IPV6)
765 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
766 struct net_device *dev,
767 struct geneve_sock *gs6,
768 struct flowi6 *fl6,
769 const struct ip_tunnel_info *info)
770 {
771 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
772 struct geneve_dev *geneve = netdev_priv(dev);
773 struct dst_entry *dst = NULL;
774 struct dst_cache *dst_cache;
775 __u8 prio;
776
777 if (!gs6)
778 return ERR_PTR(-EIO);
779
780 memset(fl6, 0, sizeof(*fl6));
781 fl6->flowi6_mark = skb->mark;
782 fl6->flowi6_proto = IPPROTO_UDP;
783 fl6->daddr = info->key.u.ipv6.dst;
784 fl6->saddr = info->key.u.ipv6.src;
785 prio = info->key.tos;
786 if ((prio == 1) && !geneve->collect_md) {
787 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
788 use_cache = false;
789 }
790
791 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
792 info->key.label);
793 dst_cache = (struct dst_cache *)&info->dst_cache;
794 if (use_cache) {
795 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
796 if (dst)
797 return dst;
798 }
799 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
800 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
801 return ERR_PTR(-ENETUNREACH);
802 }
803 if (dst->dev == dev) { /* is this necessary? */
804 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
805 dst_release(dst);
806 return ERR_PTR(-ELOOP);
807 }
808
809 if (use_cache)
810 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
811 return dst;
812 }
813 #endif
814
815 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
816 struct geneve_dev *geneve,
817 const struct ip_tunnel_info *info)
818 {
819 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
820 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
821 const struct ip_tunnel_key *key = &info->key;
822 struct rtable *rt;
823 struct flowi4 fl4;
824 __u8 tos, ttl;
825 __be16 sport;
826 __be16 df;
827 int err;
828
829 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
830 if (IS_ERR(rt))
831 return PTR_ERR(rt);
832
833 if (skb_dst(skb)) {
834 int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) -
835 GENEVE_BASE_HLEN - info->options_len - 14;
836
837 skb_dst_update_pmtu(skb, mtu);
838 }
839
840 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
841 if (geneve->collect_md) {
842 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
843 ttl = key->ttl;
844 } else {
845 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
846 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
847 }
848 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
849
850 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
851 if (unlikely(err))
852 return err;
853
854 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
855 tos, ttl, df, sport, geneve->info.key.tp_dst,
856 !net_eq(geneve->net, dev_net(geneve->dev)),
857 !(info->key.tun_flags & TUNNEL_CSUM));
858 return 0;
859 }
860
861 #if IS_ENABLED(CONFIG_IPV6)
862 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
863 struct geneve_dev *geneve,
864 const struct ip_tunnel_info *info)
865 {
866 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
867 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
868 const struct ip_tunnel_key *key = &info->key;
869 struct dst_entry *dst = NULL;
870 struct flowi6 fl6;
871 __u8 prio, ttl;
872 __be16 sport;
873 int err;
874
875 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
876 if (IS_ERR(dst))
877 return PTR_ERR(dst);
878
879 if (skb_dst(skb)) {
880 int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) -
881 GENEVE_BASE_HLEN - info->options_len - 14;
882
883 skb_dst_update_pmtu(skb, mtu);
884 }
885
886 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
887 if (geneve->collect_md) {
888 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
889 ttl = key->ttl;
890 } else {
891 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
892 ip_hdr(skb), skb);
893 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
894 }
895 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
896 if (unlikely(err))
897 return err;
898
899 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
900 &fl6.saddr, &fl6.daddr, prio, ttl,
901 info->key.label, sport, geneve->info.key.tp_dst,
902 !(info->key.tun_flags & TUNNEL_CSUM));
903 return 0;
904 }
905 #endif
906
907 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
908 {
909 struct geneve_dev *geneve = netdev_priv(dev);
910 struct ip_tunnel_info *info = NULL;
911 int err;
912
913 if (geneve->collect_md) {
914 info = skb_tunnel_info(skb);
915 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
916 err = -EINVAL;
917 netdev_dbg(dev, "no tunnel metadata\n");
918 goto tx_error;
919 }
920 } else {
921 info = &geneve->info;
922 }
923
924 rcu_read_lock();
925 #if IS_ENABLED(CONFIG_IPV6)
926 if (info->mode & IP_TUNNEL_INFO_IPV6)
927 err = geneve6_xmit_skb(skb, dev, geneve, info);
928 else
929 #endif
930 err = geneve_xmit_skb(skb, dev, geneve, info);
931 rcu_read_unlock();
932
933 if (likely(!err))
934 return NETDEV_TX_OK;
935 tx_error:
936 dev_kfree_skb(skb);
937
938 if (err == -ELOOP)
939 dev->stats.collisions++;
940 else if (err == -ENETUNREACH)
941 dev->stats.tx_carrier_errors++;
942
943 dev->stats.tx_errors++;
944 return NETDEV_TX_OK;
945 }
946
947 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
948 {
949 /* Only possible if called internally, ndo_change_mtu path's new_mtu
950 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
951 */
952 if (new_mtu > dev->max_mtu)
953 new_mtu = dev->max_mtu;
954
955 dev->mtu = new_mtu;
956 return 0;
957 }
958
959 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
960 {
961 struct ip_tunnel_info *info = skb_tunnel_info(skb);
962 struct geneve_dev *geneve = netdev_priv(dev);
963
964 if (ip_tunnel_info_af(info) == AF_INET) {
965 struct rtable *rt;
966 struct flowi4 fl4;
967 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
968
969 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
970 if (IS_ERR(rt))
971 return PTR_ERR(rt);
972
973 ip_rt_put(rt);
974 info->key.u.ipv4.src = fl4.saddr;
975 #if IS_ENABLED(CONFIG_IPV6)
976 } else if (ip_tunnel_info_af(info) == AF_INET6) {
977 struct dst_entry *dst;
978 struct flowi6 fl6;
979 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
980
981 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
982 if (IS_ERR(dst))
983 return PTR_ERR(dst);
984
985 dst_release(dst);
986 info->key.u.ipv6.src = fl6.saddr;
987 #endif
988 } else {
989 return -EINVAL;
990 }
991
992 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
993 1, USHRT_MAX, true);
994 info->key.tp_dst = geneve->info.key.tp_dst;
995 return 0;
996 }
997
998 static const struct net_device_ops geneve_netdev_ops = {
999 .ndo_init = geneve_init,
1000 .ndo_uninit = geneve_uninit,
1001 .ndo_open = geneve_open,
1002 .ndo_stop = geneve_stop,
1003 .ndo_start_xmit = geneve_xmit,
1004 .ndo_get_stats64 = ip_tunnel_get_stats64,
1005 .ndo_change_mtu = geneve_change_mtu,
1006 .ndo_validate_addr = eth_validate_addr,
1007 .ndo_set_mac_address = eth_mac_addr,
1008 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1009 };
1010
1011 static void geneve_get_drvinfo(struct net_device *dev,
1012 struct ethtool_drvinfo *drvinfo)
1013 {
1014 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1015 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1016 }
1017
1018 static const struct ethtool_ops geneve_ethtool_ops = {
1019 .get_drvinfo = geneve_get_drvinfo,
1020 .get_link = ethtool_op_get_link,
1021 };
1022
1023 /* Info for udev, that this is a virtual tunnel endpoint */
1024 static struct device_type geneve_type = {
1025 .name = "geneve",
1026 };
1027
1028 /* Calls the ndo_udp_tunnel_add of the caller in order to
1029 * supply the listening GENEVE udp ports. Callers are expected
1030 * to implement the ndo_udp_tunnel_add.
1031 */
1032 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1033 {
1034 struct net *net = dev_net(dev);
1035 struct geneve_net *gn = net_generic(net, geneve_net_id);
1036 struct geneve_sock *gs;
1037
1038 rcu_read_lock();
1039 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1040 if (push) {
1041 udp_tunnel_push_rx_port(dev, gs->sock,
1042 UDP_TUNNEL_TYPE_GENEVE);
1043 } else {
1044 udp_tunnel_drop_rx_port(dev, gs->sock,
1045 UDP_TUNNEL_TYPE_GENEVE);
1046 }
1047 }
1048 rcu_read_unlock();
1049 }
1050
1051 /* Initialize the device structure. */
1052 static void geneve_setup(struct net_device *dev)
1053 {
1054 ether_setup(dev);
1055
1056 dev->netdev_ops = &geneve_netdev_ops;
1057 dev->ethtool_ops = &geneve_ethtool_ops;
1058 dev->needs_free_netdev = true;
1059
1060 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1061
1062 dev->features |= NETIF_F_LLTX;
1063 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1064 dev->features |= NETIF_F_RXCSUM;
1065 dev->features |= NETIF_F_GSO_SOFTWARE;
1066
1067 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1068 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1069
1070 /* MTU range: 68 - (something less than 65535) */
1071 dev->min_mtu = ETH_MIN_MTU;
1072 /* The max_mtu calculation does not take account of GENEVE
1073 * options, to avoid excluding potentially valid
1074 * configurations. This will be further reduced by IPvX hdr size.
1075 */
1076 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1077
1078 netif_keep_dst(dev);
1079 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1080 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1081 eth_hw_addr_random(dev);
1082 }
1083
1084 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1085 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1086 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1087 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1088 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1089 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1090 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1091 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1092 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1093 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1094 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1095 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1096 };
1097
1098 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1099 struct netlink_ext_ack *extack)
1100 {
1101 if (tb[IFLA_ADDRESS]) {
1102 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1103 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1104 "Provided link layer address is not Ethernet");
1105 return -EINVAL;
1106 }
1107
1108 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1109 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1110 "Provided Ethernet address is not unicast");
1111 return -EADDRNOTAVAIL;
1112 }
1113 }
1114
1115 if (!data) {
1116 NL_SET_ERR_MSG(extack,
1117 "Not enough attributes provided to perform the operation");
1118 return -EINVAL;
1119 }
1120
1121 if (data[IFLA_GENEVE_ID]) {
1122 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1123
1124 if (vni >= GENEVE_N_VID) {
1125 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1126 "Geneve ID must be lower than 16777216");
1127 return -ERANGE;
1128 }
1129 }
1130
1131 return 0;
1132 }
1133
1134 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1135 const struct ip_tunnel_info *info,
1136 bool *tun_on_same_port,
1137 bool *tun_collect_md)
1138 {
1139 struct geneve_dev *geneve, *t = NULL;
1140
1141 *tun_on_same_port = false;
1142 *tun_collect_md = false;
1143 list_for_each_entry(geneve, &gn->geneve_list, next) {
1144 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1145 *tun_collect_md = geneve->collect_md;
1146 *tun_on_same_port = true;
1147 }
1148 if (info->key.tun_id == geneve->info.key.tun_id &&
1149 info->key.tp_dst == geneve->info.key.tp_dst &&
1150 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1151 t = geneve;
1152 }
1153 return t;
1154 }
1155
1156 static bool is_all_zero(const u8 *fp, size_t size)
1157 {
1158 int i;
1159
1160 for (i = 0; i < size; i++)
1161 if (fp[i])
1162 return false;
1163 return true;
1164 }
1165
1166 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1167 {
1168 if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1169 info->key.ttl || info->key.label || info->key.tp_src ||
1170 !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1171 return false;
1172 else
1173 return true;
1174 }
1175
1176 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1177 struct ip_tunnel_info *b)
1178 {
1179 if (ip_tunnel_info_af(a) == AF_INET)
1180 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1181 else
1182 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1183 }
1184
1185 static int geneve_configure(struct net *net, struct net_device *dev,
1186 struct netlink_ext_ack *extack,
1187 const struct ip_tunnel_info *info,
1188 bool metadata, bool ipv6_rx_csum)
1189 {
1190 struct geneve_net *gn = net_generic(net, geneve_net_id);
1191 struct geneve_dev *t, *geneve = netdev_priv(dev);
1192 bool tun_collect_md, tun_on_same_port;
1193 int err, encap_len;
1194
1195 if (metadata && !is_tnl_info_zero(info)) {
1196 NL_SET_ERR_MSG(extack,
1197 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1198 return -EINVAL;
1199 }
1200
1201 geneve->net = net;
1202 geneve->dev = dev;
1203
1204 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1205 if (t)
1206 return -EBUSY;
1207
1208 /* make enough headroom for basic scenario */
1209 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1210 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1211 encap_len += sizeof(struct iphdr);
1212 dev->max_mtu -= sizeof(struct iphdr);
1213 } else {
1214 encap_len += sizeof(struct ipv6hdr);
1215 dev->max_mtu -= sizeof(struct ipv6hdr);
1216 }
1217 dev->needed_headroom = encap_len + ETH_HLEN;
1218
1219 if (metadata) {
1220 if (tun_on_same_port) {
1221 NL_SET_ERR_MSG(extack,
1222 "There can be only one externally controlled device on a destination port");
1223 return -EPERM;
1224 }
1225 } else {
1226 if (tun_collect_md) {
1227 NL_SET_ERR_MSG(extack,
1228 "There already exists an externally controlled device on this destination port");
1229 return -EPERM;
1230 }
1231 }
1232
1233 dst_cache_reset(&geneve->info.dst_cache);
1234 geneve->info = *info;
1235 geneve->collect_md = metadata;
1236 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1237
1238 err = register_netdevice(dev);
1239 if (err)
1240 return err;
1241
1242 list_add(&geneve->next, &gn->geneve_list);
1243 return 0;
1244 }
1245
1246 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1247 {
1248 memset(info, 0, sizeof(*info));
1249 info->key.tp_dst = htons(dst_port);
1250 }
1251
1252 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1253 struct netlink_ext_ack *extack,
1254 struct ip_tunnel_info *info, bool *metadata,
1255 bool *use_udp6_rx_checksums, bool changelink)
1256 {
1257 int attrtype;
1258
1259 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1260 NL_SET_ERR_MSG(extack,
1261 "Cannot specify both IPv4 and IPv6 Remote addresses");
1262 return -EINVAL;
1263 }
1264
1265 if (data[IFLA_GENEVE_REMOTE]) {
1266 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1267 attrtype = IFLA_GENEVE_REMOTE;
1268 goto change_notsup;
1269 }
1270
1271 info->key.u.ipv4.dst =
1272 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1273
1274 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1275 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1276 "Remote IPv4 address cannot be Multicast");
1277 return -EINVAL;
1278 }
1279 }
1280
1281 if (data[IFLA_GENEVE_REMOTE6]) {
1282 #if IS_ENABLED(CONFIG_IPV6)
1283 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1284 attrtype = IFLA_GENEVE_REMOTE6;
1285 goto change_notsup;
1286 }
1287
1288 info->mode = IP_TUNNEL_INFO_IPV6;
1289 info->key.u.ipv6.dst =
1290 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1291
1292 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1293 IPV6_ADDR_LINKLOCAL) {
1294 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1295 "Remote IPv6 address cannot be link-local");
1296 return -EINVAL;
1297 }
1298 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1299 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1300 "Remote IPv6 address cannot be Multicast");
1301 return -EINVAL;
1302 }
1303 info->key.tun_flags |= TUNNEL_CSUM;
1304 *use_udp6_rx_checksums = true;
1305 #else
1306 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1307 "IPv6 support not enabled in the kernel");
1308 return -EPFNOSUPPORT;
1309 #endif
1310 }
1311
1312 if (data[IFLA_GENEVE_ID]) {
1313 __u32 vni;
1314 __u8 tvni[3];
1315 __be64 tunid;
1316
1317 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1318 tvni[0] = (vni & 0x00ff0000) >> 16;
1319 tvni[1] = (vni & 0x0000ff00) >> 8;
1320 tvni[2] = vni & 0x000000ff;
1321
1322 tunid = vni_to_tunnel_id(tvni);
1323 if (changelink && (tunid != info->key.tun_id)) {
1324 attrtype = IFLA_GENEVE_ID;
1325 goto change_notsup;
1326 }
1327 info->key.tun_id = tunid;
1328 }
1329
1330 if (data[IFLA_GENEVE_TTL])
1331 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1332
1333 if (data[IFLA_GENEVE_TOS])
1334 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1335
1336 if (data[IFLA_GENEVE_LABEL]) {
1337 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1338 IPV6_FLOWLABEL_MASK;
1339 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1340 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1341 "Label attribute only applies for IPv6 Geneve devices");
1342 return -EINVAL;
1343 }
1344 }
1345
1346 if (data[IFLA_GENEVE_PORT]) {
1347 if (changelink) {
1348 attrtype = IFLA_GENEVE_PORT;
1349 goto change_notsup;
1350 }
1351 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1352 }
1353
1354 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1355 if (changelink) {
1356 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1357 goto change_notsup;
1358 }
1359 *metadata = true;
1360 }
1361
1362 if (data[IFLA_GENEVE_UDP_CSUM]) {
1363 if (changelink) {
1364 attrtype = IFLA_GENEVE_UDP_CSUM;
1365 goto change_notsup;
1366 }
1367 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1368 info->key.tun_flags |= TUNNEL_CSUM;
1369 }
1370
1371 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1372 if (changelink) {
1373 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1374 goto change_notsup;
1375 }
1376 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1377 info->key.tun_flags &= ~TUNNEL_CSUM;
1378 }
1379
1380 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1381 if (changelink) {
1382 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1383 goto change_notsup;
1384 }
1385 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1386 *use_udp6_rx_checksums = false;
1387 }
1388
1389 return 0;
1390 change_notsup:
1391 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1392 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1393 return -EOPNOTSUPP;
1394 }
1395
1396 static int geneve_newlink(struct net *net, struct net_device *dev,
1397 struct nlattr *tb[], struct nlattr *data[],
1398 struct netlink_ext_ack *extack)
1399 {
1400 bool use_udp6_rx_checksums = false;
1401 struct ip_tunnel_info info;
1402 bool metadata = false;
1403 int err;
1404
1405 init_tnl_info(&info, GENEVE_UDP_PORT);
1406 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1407 &use_udp6_rx_checksums, false);
1408 if (err)
1409 return err;
1410
1411 return geneve_configure(net, dev, extack, &info, metadata,
1412 use_udp6_rx_checksums);
1413 }
1414
1415 /* Quiesces the geneve device data path for both TX and RX.
1416 *
1417 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1418 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1419 * to complete for the existing set of in-flight packets to be transmitted,
1420 * then we would have quiesced the transmit data path. All the future packets
1421 * will get dropped until we unquiesce the data path.
1422 *
1423 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1424 * if we set that to NULL under RCU and wait for synchronize_net() to
1425 * complete, then we would have quiesced the receive data path.
1426 */
1427 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1428 struct geneve_sock **gs6)
1429 {
1430 *gs4 = rtnl_dereference(geneve->sock4);
1431 rcu_assign_pointer(geneve->sock4, NULL);
1432 if (*gs4)
1433 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1434 #if IS_ENABLED(CONFIG_IPV6)
1435 *gs6 = rtnl_dereference(geneve->sock6);
1436 rcu_assign_pointer(geneve->sock6, NULL);
1437 if (*gs6)
1438 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1439 #else
1440 *gs6 = NULL;
1441 #endif
1442 synchronize_net();
1443 }
1444
1445 /* Resumes the geneve device data path for both TX and RX. */
1446 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1447 struct geneve_sock __maybe_unused *gs6)
1448 {
1449 rcu_assign_pointer(geneve->sock4, gs4);
1450 if (gs4)
1451 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1452 #if IS_ENABLED(CONFIG_IPV6)
1453 rcu_assign_pointer(geneve->sock6, gs6);
1454 if (gs6)
1455 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1456 #endif
1457 synchronize_net();
1458 }
1459
1460 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1461 struct nlattr *data[],
1462 struct netlink_ext_ack *extack)
1463 {
1464 struct geneve_dev *geneve = netdev_priv(dev);
1465 struct geneve_sock *gs4, *gs6;
1466 struct ip_tunnel_info info;
1467 bool metadata;
1468 bool use_udp6_rx_checksums;
1469 int err;
1470
1471 /* If the geneve device is configured for metadata (or externally
1472 * controlled, for example, OVS), then nothing can be changed.
1473 */
1474 if (geneve->collect_md)
1475 return -EOPNOTSUPP;
1476
1477 /* Start with the existing info. */
1478 memcpy(&info, &geneve->info, sizeof(info));
1479 metadata = geneve->collect_md;
1480 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1481 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1482 &use_udp6_rx_checksums, true);
1483 if (err)
1484 return err;
1485
1486 if (!geneve_dst_addr_equal(&geneve->info, &info))
1487 dst_cache_reset(&info.dst_cache);
1488
1489 geneve_quiesce(geneve, &gs4, &gs6);
1490 geneve->info = info;
1491 geneve->collect_md = metadata;
1492 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1493 geneve_unquiesce(geneve, gs4, gs6);
1494
1495 return 0;
1496 }
1497
1498 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1499 {
1500 struct geneve_dev *geneve = netdev_priv(dev);
1501
1502 list_del(&geneve->next);
1503 unregister_netdevice_queue(dev, head);
1504 }
1505
1506 static size_t geneve_get_size(const struct net_device *dev)
1507 {
1508 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1509 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1510 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1511 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1512 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1513 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1514 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1515 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1516 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1517 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1518 0;
1519 }
1520
1521 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1522 {
1523 struct geneve_dev *geneve = netdev_priv(dev);
1524 struct ip_tunnel_info *info = &geneve->info;
1525 bool metadata = geneve->collect_md;
1526 __u8 tmp_vni[3];
1527 __u32 vni;
1528
1529 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1530 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1531 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1532 goto nla_put_failure;
1533
1534 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1535 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1536 info->key.u.ipv4.dst))
1537 goto nla_put_failure;
1538 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1539 !!(info->key.tun_flags & TUNNEL_CSUM)))
1540 goto nla_put_failure;
1541
1542 #if IS_ENABLED(CONFIG_IPV6)
1543 } else if (!metadata) {
1544 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1545 &info->key.u.ipv6.dst))
1546 goto nla_put_failure;
1547 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1548 !(info->key.tun_flags & TUNNEL_CSUM)))
1549 goto nla_put_failure;
1550 #endif
1551 }
1552
1553 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1554 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1555 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1556 goto nla_put_failure;
1557
1558 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1559 goto nla_put_failure;
1560
1561 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1562 goto nla_put_failure;
1563
1564 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1565 !geneve->use_udp6_rx_checksums))
1566 goto nla_put_failure;
1567
1568 return 0;
1569
1570 nla_put_failure:
1571 return -EMSGSIZE;
1572 }
1573
1574 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1575 .kind = "geneve",
1576 .maxtype = IFLA_GENEVE_MAX,
1577 .policy = geneve_policy,
1578 .priv_size = sizeof(struct geneve_dev),
1579 .setup = geneve_setup,
1580 .validate = geneve_validate,
1581 .newlink = geneve_newlink,
1582 .changelink = geneve_changelink,
1583 .dellink = geneve_dellink,
1584 .get_size = geneve_get_size,
1585 .fill_info = geneve_fill_info,
1586 };
1587
1588 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1589 u8 name_assign_type, u16 dst_port)
1590 {
1591 struct nlattr *tb[IFLA_MAX + 1];
1592 struct ip_tunnel_info info;
1593 struct net_device *dev;
1594 LIST_HEAD(list_kill);
1595 int err;
1596
1597 memset(tb, 0, sizeof(tb));
1598 dev = rtnl_create_link(net, name, name_assign_type,
1599 &geneve_link_ops, tb);
1600 if (IS_ERR(dev))
1601 return dev;
1602
1603 init_tnl_info(&info, dst_port);
1604 err = geneve_configure(net, dev, NULL, &info, true, true);
1605 if (err) {
1606 free_netdev(dev);
1607 return ERR_PTR(err);
1608 }
1609
1610 /* openvswitch users expect packet sizes to be unrestricted,
1611 * so set the largest MTU we can.
1612 */
1613 err = geneve_change_mtu(dev, IP_MAX_MTU);
1614 if (err)
1615 goto err;
1616
1617 err = rtnl_configure_link(dev, NULL);
1618 if (err < 0)
1619 goto err;
1620
1621 return dev;
1622 err:
1623 geneve_dellink(dev, &list_kill);
1624 unregister_netdevice_many(&list_kill);
1625 return ERR_PTR(err);
1626 }
1627 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1628
1629 static int geneve_netdevice_event(struct notifier_block *unused,
1630 unsigned long event, void *ptr)
1631 {
1632 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1633
1634 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1635 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1636 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1637 } else if (event == NETDEV_UNREGISTER) {
1638 geneve_offload_rx_ports(dev, false);
1639 } else if (event == NETDEV_REGISTER) {
1640 geneve_offload_rx_ports(dev, true);
1641 }
1642
1643 return NOTIFY_DONE;
1644 }
1645
1646 static struct notifier_block geneve_notifier_block __read_mostly = {
1647 .notifier_call = geneve_netdevice_event,
1648 };
1649
1650 static __net_init int geneve_init_net(struct net *net)
1651 {
1652 struct geneve_net *gn = net_generic(net, geneve_net_id);
1653
1654 INIT_LIST_HEAD(&gn->geneve_list);
1655 INIT_LIST_HEAD(&gn->sock_list);
1656 return 0;
1657 }
1658
1659 static void __net_exit geneve_exit_net(struct net *net)
1660 {
1661 struct geneve_net *gn = net_generic(net, geneve_net_id);
1662 struct geneve_dev *geneve, *next;
1663 struct net_device *dev, *aux;
1664 LIST_HEAD(list);
1665
1666 rtnl_lock();
1667
1668 /* gather any geneve devices that were moved into this ns */
1669 for_each_netdev_safe(net, dev, aux)
1670 if (dev->rtnl_link_ops == &geneve_link_ops)
1671 unregister_netdevice_queue(dev, &list);
1672
1673 /* now gather any other geneve devices that were created in this ns */
1674 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1675 /* If geneve->dev is in the same netns, it was already added
1676 * to the list by the previous loop.
1677 */
1678 if (!net_eq(dev_net(geneve->dev), net))
1679 unregister_netdevice_queue(geneve->dev, &list);
1680 }
1681
1682 /* unregister the devices gathered above */
1683 unregister_netdevice_many(&list);
1684 rtnl_unlock();
1685 }
1686
1687 static struct pernet_operations geneve_net_ops = {
1688 .init = geneve_init_net,
1689 .exit = geneve_exit_net,
1690 .id = &geneve_net_id,
1691 .size = sizeof(struct geneve_net),
1692 };
1693
1694 static int __init geneve_init_module(void)
1695 {
1696 int rc;
1697
1698 rc = register_pernet_subsys(&geneve_net_ops);
1699 if (rc)
1700 goto out1;
1701
1702 rc = register_netdevice_notifier(&geneve_notifier_block);
1703 if (rc)
1704 goto out2;
1705
1706 rc = rtnl_link_register(&geneve_link_ops);
1707 if (rc)
1708 goto out3;
1709
1710 return 0;
1711 out3:
1712 unregister_netdevice_notifier(&geneve_notifier_block);
1713 out2:
1714 unregister_pernet_subsys(&geneve_net_ops);
1715 out1:
1716 return rc;
1717 }
1718 late_initcall(geneve_init_module);
1719
1720 static void __exit geneve_cleanup_module(void)
1721 {
1722 rtnl_link_unregister(&geneve_link_ops);
1723 unregister_netdevice_notifier(&geneve_notifier_block);
1724 unregister_pernet_subsys(&geneve_net_ops);
1725 }
1726 module_exit(geneve_cleanup_module);
1727
1728 MODULE_LICENSE("GPL");
1729 MODULE_VERSION(GENEVE_NETDEV_VER);
1730 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1731 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1732 MODULE_ALIAS_RTNL_LINK("geneve");