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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[deliverable/linux.git] / drivers / net / geneve.c
1 /*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/hash.h>
18 #include <net/dst_metadata.h>
19 #include <net/gro_cells.h>
20 #include <net/rtnetlink.h>
21 #include <net/geneve.h>
22 #include <net/protocol.h>
23
24 #define GENEVE_NETDEV_VER "0.6"
25
26 #define GENEVE_UDP_PORT 6081
27
28 #define GENEVE_N_VID (1u << 24)
29 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
30
31 #define VNI_HASH_BITS 10
32 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33
34 static bool log_ecn_error = true;
35 module_param(log_ecn_error, bool, 0644);
36 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
37
38 #define GENEVE_VER 0
39 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
40
41 /* per-network namespace private data for this module */
42 struct geneve_net {
43 struct list_head geneve_list;
44 struct list_head sock_list;
45 };
46
47 static int geneve_net_id;
48
49 union geneve_addr {
50 struct sockaddr_in sin;
51 struct sockaddr_in6 sin6;
52 struct sockaddr sa;
53 };
54
55 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
56
57 /* Pseudo network device */
58 struct geneve_dev {
59 struct hlist_node hlist; /* vni hash table */
60 struct net *net; /* netns for packet i/o */
61 struct net_device *dev; /* netdev for geneve tunnel */
62 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
63 #if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
65 #endif
66 u8 vni[3]; /* virtual network ID for tunnel */
67 u8 ttl; /* TTL override */
68 u8 tos; /* TOS override */
69 union geneve_addr remote; /* IP address for link partner */
70 struct list_head next; /* geneve's per namespace list */
71 __be32 label; /* IPv6 flowlabel override */
72 __be16 dst_port;
73 bool collect_md;
74 struct gro_cells gro_cells;
75 u32 flags;
76 struct dst_cache dst_cache;
77 };
78
79 /* Geneve device flags */
80 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
81 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
82 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
83
84 struct geneve_sock {
85 bool collect_md;
86 struct list_head list;
87 struct socket *sock;
88 struct rcu_head rcu;
89 int refcnt;
90 struct hlist_head vni_list[VNI_HASH_SIZE];
91 u32 flags;
92 };
93
94 static inline __u32 geneve_net_vni_hash(u8 vni[3])
95 {
96 __u32 vnid;
97
98 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
99 return hash_32(vnid, VNI_HASH_BITS);
100 }
101
102 static __be64 vni_to_tunnel_id(const __u8 *vni)
103 {
104 #ifdef __BIG_ENDIAN
105 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
106 #else
107 return (__force __be64)(((__force u64)vni[0] << 40) |
108 ((__force u64)vni[1] << 48) |
109 ((__force u64)vni[2] << 56));
110 #endif
111 }
112
113 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
114 {
115 return gs->sock->sk->sk_family;
116 }
117
118 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
119 __be32 addr, u8 vni[])
120 {
121 struct hlist_head *vni_list_head;
122 struct geneve_dev *geneve;
123 __u32 hash;
124
125 /* Find the device for this VNI */
126 hash = geneve_net_vni_hash(vni);
127 vni_list_head = &gs->vni_list[hash];
128 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
129 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
130 addr == geneve->remote.sin.sin_addr.s_addr)
131 return geneve;
132 }
133 return NULL;
134 }
135
136 #if IS_ENABLED(CONFIG_IPV6)
137 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
138 struct in6_addr addr6, u8 vni[])
139 {
140 struct hlist_head *vni_list_head;
141 struct geneve_dev *geneve;
142 __u32 hash;
143
144 /* Find the device for this VNI */
145 hash = geneve_net_vni_hash(vni);
146 vni_list_head = &gs->vni_list[hash];
147 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
148 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
149 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
150 return geneve;
151 }
152 return NULL;
153 }
154 #endif
155
156 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
157 {
158 return (struct genevehdr *)(udp_hdr(skb) + 1);
159 }
160
161 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
162 struct sk_buff *skb)
163 {
164 u8 *vni;
165 __be32 addr;
166 static u8 zero_vni[3];
167 #if IS_ENABLED(CONFIG_IPV6)
168 static struct in6_addr zero_addr6;
169 #endif
170
171 if (geneve_get_sk_family(gs) == AF_INET) {
172 struct iphdr *iph;
173
174 iph = ip_hdr(skb); /* outer IP header... */
175
176 if (gs->collect_md) {
177 vni = zero_vni;
178 addr = 0;
179 } else {
180 vni = geneve_hdr(skb)->vni;
181 addr = iph->saddr;
182 }
183
184 return geneve_lookup(gs, addr, vni);
185 #if IS_ENABLED(CONFIG_IPV6)
186 } else if (geneve_get_sk_family(gs) == AF_INET6) {
187 struct ipv6hdr *ip6h;
188 struct in6_addr addr6;
189
190 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
191
192 if (gs->collect_md) {
193 vni = zero_vni;
194 addr6 = zero_addr6;
195 } else {
196 vni = geneve_hdr(skb)->vni;
197 addr6 = ip6h->saddr;
198 }
199
200 return geneve6_lookup(gs, addr6, vni);
201 #endif
202 }
203 return NULL;
204 }
205
206 /* geneve receive/decap routine */
207 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
208 struct sk_buff *skb)
209 {
210 struct genevehdr *gnvh = geneve_hdr(skb);
211 struct metadata_dst *tun_dst = NULL;
212 struct pcpu_sw_netstats *stats;
213 int err = 0;
214 void *oiph;
215
216 if (ip_tunnel_collect_metadata() || gs->collect_md) {
217 __be16 flags;
218
219 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
220 (gnvh->oam ? TUNNEL_OAM : 0) |
221 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
222
223 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
224 vni_to_tunnel_id(gnvh->vni),
225 gnvh->opt_len * 4);
226 if (!tun_dst)
227 goto drop;
228 /* Update tunnel dst according to Geneve options. */
229 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
230 gnvh->options, gnvh->opt_len * 4);
231 } else {
232 /* Drop packets w/ critical options,
233 * since we don't support any...
234 */
235 if (gnvh->critical)
236 goto drop;
237 }
238
239 skb_reset_mac_header(skb);
240 skb->protocol = eth_type_trans(skb, geneve->dev);
241 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
242
243 if (tun_dst)
244 skb_dst_set(skb, &tun_dst->dst);
245
246 /* Ignore packet loops (and multicast echo) */
247 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
248 goto drop;
249
250 oiph = skb_network_header(skb);
251 skb_reset_network_header(skb);
252
253 if (geneve_get_sk_family(gs) == AF_INET)
254 err = IP_ECN_decapsulate(oiph, skb);
255 #if IS_ENABLED(CONFIG_IPV6)
256 else
257 err = IP6_ECN_decapsulate(oiph, skb);
258 #endif
259
260 if (unlikely(err)) {
261 if (log_ecn_error) {
262 if (geneve_get_sk_family(gs) == AF_INET)
263 net_info_ratelimited("non-ECT from %pI4 "
264 "with TOS=%#x\n",
265 &((struct iphdr *)oiph)->saddr,
266 ((struct iphdr *)oiph)->tos);
267 #if IS_ENABLED(CONFIG_IPV6)
268 else
269 net_info_ratelimited("non-ECT from %pI6\n",
270 &((struct ipv6hdr *)oiph)->saddr);
271 #endif
272 }
273 if (err > 1) {
274 ++geneve->dev->stats.rx_frame_errors;
275 ++geneve->dev->stats.rx_errors;
276 goto drop;
277 }
278 }
279
280 stats = this_cpu_ptr(geneve->dev->tstats);
281 u64_stats_update_begin(&stats->syncp);
282 stats->rx_packets++;
283 stats->rx_bytes += skb->len;
284 u64_stats_update_end(&stats->syncp);
285
286 gro_cells_receive(&geneve->gro_cells, skb);
287 return;
288 drop:
289 /* Consume bad packet */
290 kfree_skb(skb);
291 }
292
293 /* Setup stats when device is created */
294 static int geneve_init(struct net_device *dev)
295 {
296 struct geneve_dev *geneve = netdev_priv(dev);
297 int err;
298
299 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
300 if (!dev->tstats)
301 return -ENOMEM;
302
303 err = gro_cells_init(&geneve->gro_cells, dev);
304 if (err) {
305 free_percpu(dev->tstats);
306 return err;
307 }
308
309 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
310 if (err) {
311 free_percpu(dev->tstats);
312 gro_cells_destroy(&geneve->gro_cells);
313 return err;
314 }
315
316 return 0;
317 }
318
319 static void geneve_uninit(struct net_device *dev)
320 {
321 struct geneve_dev *geneve = netdev_priv(dev);
322
323 dst_cache_destroy(&geneve->dst_cache);
324 gro_cells_destroy(&geneve->gro_cells);
325 free_percpu(dev->tstats);
326 }
327
328 /* Callback from net/ipv4/udp.c to receive packets */
329 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
330 {
331 struct genevehdr *geneveh;
332 struct geneve_dev *geneve;
333 struct geneve_sock *gs;
334 int opts_len;
335
336 /* Need Geneve and inner Ethernet header to be present */
337 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
338 goto error;
339
340 /* Return packets with reserved bits set */
341 geneveh = geneve_hdr(skb);
342 if (unlikely(geneveh->ver != GENEVE_VER))
343 goto error;
344
345 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
346 goto error;
347
348 gs = rcu_dereference_sk_user_data(sk);
349 if (!gs)
350 goto drop;
351
352 geneve = geneve_lookup_skb(gs, skb);
353 if (!geneve)
354 goto drop;
355
356 opts_len = geneveh->opt_len * 4;
357 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
358 htons(ETH_P_TEB),
359 !net_eq(geneve->net, dev_net(geneve->dev))))
360 goto drop;
361
362 geneve_rx(geneve, gs, skb);
363 return 0;
364
365 drop:
366 /* Consume bad packet */
367 kfree_skb(skb);
368 return 0;
369
370 error:
371 /* Let the UDP layer deal with the skb */
372 return 1;
373 }
374
375 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
376 __be16 port, u32 flags)
377 {
378 struct socket *sock;
379 struct udp_port_cfg udp_conf;
380 int err;
381
382 memset(&udp_conf, 0, sizeof(udp_conf));
383
384 if (ipv6) {
385 udp_conf.family = AF_INET6;
386 udp_conf.ipv6_v6only = 1;
387 udp_conf.use_udp6_rx_checksums =
388 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
389 } else {
390 udp_conf.family = AF_INET;
391 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
392 }
393
394 udp_conf.local_udp_port = port;
395
396 /* Open UDP socket */
397 err = udp_sock_create(net, &udp_conf, &sock);
398 if (err < 0)
399 return ERR_PTR(err);
400
401 return sock;
402 }
403
404 static void geneve_notify_add_rx_port(struct geneve_sock *gs)
405 {
406 struct net_device *dev;
407 struct sock *sk = gs->sock->sk;
408 struct net *net = sock_net(sk);
409 sa_family_t sa_family = geneve_get_sk_family(gs);
410 __be16 port = inet_sk(sk)->inet_sport;
411
412 rcu_read_lock();
413 for_each_netdev_rcu(net, dev) {
414 if (dev->netdev_ops->ndo_add_geneve_port)
415 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
416 port);
417 }
418 rcu_read_unlock();
419 }
420
421 static int geneve_hlen(struct genevehdr *gh)
422 {
423 return sizeof(*gh) + gh->opt_len * 4;
424 }
425
426 static struct sk_buff **geneve_gro_receive(struct sock *sk,
427 struct sk_buff **head,
428 struct sk_buff *skb)
429 {
430 struct sk_buff *p, **pp = NULL;
431 struct genevehdr *gh, *gh2;
432 unsigned int hlen, gh_len, off_gnv;
433 const struct packet_offload *ptype;
434 __be16 type;
435 int flush = 1;
436
437 off_gnv = skb_gro_offset(skb);
438 hlen = off_gnv + sizeof(*gh);
439 gh = skb_gro_header_fast(skb, off_gnv);
440 if (skb_gro_header_hard(skb, hlen)) {
441 gh = skb_gro_header_slow(skb, hlen, off_gnv);
442 if (unlikely(!gh))
443 goto out;
444 }
445
446 if (gh->ver != GENEVE_VER || gh->oam)
447 goto out;
448 gh_len = geneve_hlen(gh);
449
450 hlen = off_gnv + gh_len;
451 if (skb_gro_header_hard(skb, hlen)) {
452 gh = skb_gro_header_slow(skb, hlen, off_gnv);
453 if (unlikely(!gh))
454 goto out;
455 }
456
457 for (p = *head; p; p = p->next) {
458 if (!NAPI_GRO_CB(p)->same_flow)
459 continue;
460
461 gh2 = (struct genevehdr *)(p->data + off_gnv);
462 if (gh->opt_len != gh2->opt_len ||
463 memcmp(gh, gh2, gh_len)) {
464 NAPI_GRO_CB(p)->same_flow = 0;
465 continue;
466 }
467 }
468
469 type = gh->proto_type;
470
471 rcu_read_lock();
472 ptype = gro_find_receive_by_type(type);
473 if (!ptype)
474 goto out_unlock;
475
476 skb_gro_pull(skb, gh_len);
477 skb_gro_postpull_rcsum(skb, gh, gh_len);
478 pp = ptype->callbacks.gro_receive(head, skb);
479 flush = 0;
480
481 out_unlock:
482 rcu_read_unlock();
483 out:
484 NAPI_GRO_CB(skb)->flush |= flush;
485
486 return pp;
487 }
488
489 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
490 int nhoff)
491 {
492 struct genevehdr *gh;
493 struct packet_offload *ptype;
494 __be16 type;
495 int gh_len;
496 int err = -ENOSYS;
497
498 gh = (struct genevehdr *)(skb->data + nhoff);
499 gh_len = geneve_hlen(gh);
500 type = gh->proto_type;
501
502 rcu_read_lock();
503 ptype = gro_find_complete_by_type(type);
504 if (ptype)
505 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
506
507 rcu_read_unlock();
508
509 skb_set_inner_mac_header(skb, nhoff + gh_len);
510
511 return err;
512 }
513
514 /* Create new listen socket if needed */
515 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
516 bool ipv6, u32 flags)
517 {
518 struct geneve_net *gn = net_generic(net, geneve_net_id);
519 struct geneve_sock *gs;
520 struct socket *sock;
521 struct udp_tunnel_sock_cfg tunnel_cfg;
522 int h;
523
524 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
525 if (!gs)
526 return ERR_PTR(-ENOMEM);
527
528 sock = geneve_create_sock(net, ipv6, port, flags);
529 if (IS_ERR(sock)) {
530 kfree(gs);
531 return ERR_CAST(sock);
532 }
533
534 gs->sock = sock;
535 gs->refcnt = 1;
536 for (h = 0; h < VNI_HASH_SIZE; ++h)
537 INIT_HLIST_HEAD(&gs->vni_list[h]);
538
539 /* Initialize the geneve udp offloads structure */
540 geneve_notify_add_rx_port(gs);
541
542 /* Mark socket as an encapsulation socket */
543 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
544 tunnel_cfg.sk_user_data = gs;
545 tunnel_cfg.encap_type = 1;
546 tunnel_cfg.gro_receive = geneve_gro_receive;
547 tunnel_cfg.gro_complete = geneve_gro_complete;
548 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
549 tunnel_cfg.encap_destroy = NULL;
550 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
551 list_add(&gs->list, &gn->sock_list);
552 return gs;
553 }
554
555 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
556 {
557 struct net_device *dev;
558 struct sock *sk = gs->sock->sk;
559 struct net *net = sock_net(sk);
560 sa_family_t sa_family = geneve_get_sk_family(gs);
561 __be16 port = inet_sk(sk)->inet_sport;
562
563 rcu_read_lock();
564 for_each_netdev_rcu(net, dev) {
565 if (dev->netdev_ops->ndo_del_geneve_port)
566 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
567 port);
568 }
569
570 rcu_read_unlock();
571 }
572
573 static void __geneve_sock_release(struct geneve_sock *gs)
574 {
575 if (!gs || --gs->refcnt)
576 return;
577
578 list_del(&gs->list);
579 geneve_notify_del_rx_port(gs);
580 udp_tunnel_sock_release(gs->sock);
581 kfree_rcu(gs, rcu);
582 }
583
584 static void geneve_sock_release(struct geneve_dev *geneve)
585 {
586 __geneve_sock_release(geneve->sock4);
587 #if IS_ENABLED(CONFIG_IPV6)
588 __geneve_sock_release(geneve->sock6);
589 #endif
590 }
591
592 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
593 sa_family_t family,
594 __be16 dst_port)
595 {
596 struct geneve_sock *gs;
597
598 list_for_each_entry(gs, &gn->sock_list, list) {
599 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
600 geneve_get_sk_family(gs) == family) {
601 return gs;
602 }
603 }
604 return NULL;
605 }
606
607 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
608 {
609 struct net *net = geneve->net;
610 struct geneve_net *gn = net_generic(net, geneve_net_id);
611 struct geneve_sock *gs;
612 __u32 hash;
613
614 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
615 if (gs) {
616 gs->refcnt++;
617 goto out;
618 }
619
620 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
621 if (IS_ERR(gs))
622 return PTR_ERR(gs);
623
624 out:
625 gs->collect_md = geneve->collect_md;
626 gs->flags = geneve->flags;
627 #if IS_ENABLED(CONFIG_IPV6)
628 if (ipv6)
629 geneve->sock6 = gs;
630 else
631 #endif
632 geneve->sock4 = gs;
633
634 hash = geneve_net_vni_hash(geneve->vni);
635 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
636 return 0;
637 }
638
639 static int geneve_open(struct net_device *dev)
640 {
641 struct geneve_dev *geneve = netdev_priv(dev);
642 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
643 bool metadata = geneve->collect_md;
644 int ret = 0;
645
646 geneve->sock4 = NULL;
647 #if IS_ENABLED(CONFIG_IPV6)
648 geneve->sock6 = NULL;
649 if (ipv6 || metadata)
650 ret = geneve_sock_add(geneve, true);
651 #endif
652 if (!ret && (!ipv6 || metadata))
653 ret = geneve_sock_add(geneve, false);
654 if (ret < 0)
655 geneve_sock_release(geneve);
656
657 return ret;
658 }
659
660 static int geneve_stop(struct net_device *dev)
661 {
662 struct geneve_dev *geneve = netdev_priv(dev);
663
664 if (!hlist_unhashed(&geneve->hlist))
665 hlist_del_rcu(&geneve->hlist);
666 geneve_sock_release(geneve);
667 return 0;
668 }
669
670 static void geneve_build_header(struct genevehdr *geneveh,
671 __be16 tun_flags, u8 vni[3],
672 u8 options_len, u8 *options)
673 {
674 geneveh->ver = GENEVE_VER;
675 geneveh->opt_len = options_len / 4;
676 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
677 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
678 geneveh->rsvd1 = 0;
679 memcpy(geneveh->vni, vni, 3);
680 geneveh->proto_type = htons(ETH_P_TEB);
681 geneveh->rsvd2 = 0;
682
683 memcpy(geneveh->options, options, options_len);
684 }
685
686 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
687 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
688 u32 flags, bool xnet)
689 {
690 struct genevehdr *gnvh;
691 int min_headroom;
692 int err;
693 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
694
695 skb_scrub_packet(skb, xnet);
696
697 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
698 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
699 err = skb_cow_head(skb, min_headroom);
700 if (unlikely(err))
701 goto free_rt;
702
703 err = udp_tunnel_handle_offloads(skb, udp_sum);
704 if (err)
705 goto free_rt;
706
707 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
708 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
709
710 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
711 return 0;
712
713 free_rt:
714 ip_rt_put(rt);
715 return err;
716 }
717
718 #if IS_ENABLED(CONFIG_IPV6)
719 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
720 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
721 u32 flags, bool xnet)
722 {
723 struct genevehdr *gnvh;
724 int min_headroom;
725 int err;
726 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
727
728 skb_scrub_packet(skb, xnet);
729
730 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
731 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
732 err = skb_cow_head(skb, min_headroom);
733 if (unlikely(err))
734 goto free_dst;
735
736 err = udp_tunnel_handle_offloads(skb, udp_sum);
737 if (err)
738 goto free_dst;
739
740 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
741 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
742
743 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
744 return 0;
745
746 free_dst:
747 dst_release(dst);
748 return err;
749 }
750 #endif
751
752 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
753 struct net_device *dev,
754 struct flowi4 *fl4,
755 struct ip_tunnel_info *info)
756 {
757 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
758 struct geneve_dev *geneve = netdev_priv(dev);
759 struct dst_cache *dst_cache;
760 struct rtable *rt = NULL;
761 __u8 tos;
762
763 memset(fl4, 0, sizeof(*fl4));
764 fl4->flowi4_mark = skb->mark;
765 fl4->flowi4_proto = IPPROTO_UDP;
766
767 if (info) {
768 fl4->daddr = info->key.u.ipv4.dst;
769 fl4->saddr = info->key.u.ipv4.src;
770 fl4->flowi4_tos = RT_TOS(info->key.tos);
771 dst_cache = &info->dst_cache;
772 } else {
773 tos = geneve->tos;
774 if (tos == 1) {
775 const struct iphdr *iip = ip_hdr(skb);
776
777 tos = ip_tunnel_get_dsfield(iip, skb);
778 use_cache = false;
779 }
780
781 fl4->flowi4_tos = RT_TOS(tos);
782 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
783 dst_cache = &geneve->dst_cache;
784 }
785
786 if (use_cache) {
787 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
788 if (rt)
789 return rt;
790 }
791
792 rt = ip_route_output_key(geneve->net, fl4);
793 if (IS_ERR(rt)) {
794 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
795 return ERR_PTR(-ENETUNREACH);
796 }
797 if (rt->dst.dev == dev) { /* is this necessary? */
798 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
799 ip_rt_put(rt);
800 return ERR_PTR(-ELOOP);
801 }
802 if (use_cache)
803 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
804 return rt;
805 }
806
807 #if IS_ENABLED(CONFIG_IPV6)
808 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
809 struct net_device *dev,
810 struct flowi6 *fl6,
811 struct ip_tunnel_info *info)
812 {
813 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
814 struct geneve_dev *geneve = netdev_priv(dev);
815 struct geneve_sock *gs6 = geneve->sock6;
816 struct dst_entry *dst = NULL;
817 struct dst_cache *dst_cache;
818 __u8 prio;
819
820 memset(fl6, 0, sizeof(*fl6));
821 fl6->flowi6_mark = skb->mark;
822 fl6->flowi6_proto = IPPROTO_UDP;
823
824 if (info) {
825 fl6->daddr = info->key.u.ipv6.dst;
826 fl6->saddr = info->key.u.ipv6.src;
827 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
828 info->key.label);
829 dst_cache = &info->dst_cache;
830 } else {
831 prio = geneve->tos;
832 if (prio == 1) {
833 const struct iphdr *iip = ip_hdr(skb);
834
835 prio = ip_tunnel_get_dsfield(iip, skb);
836 use_cache = false;
837 }
838
839 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
840 geneve->label);
841 fl6->daddr = geneve->remote.sin6.sin6_addr;
842 dst_cache = &geneve->dst_cache;
843 }
844
845 if (use_cache) {
846 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
847 if (dst)
848 return dst;
849 }
850
851 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
852 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
853 return ERR_PTR(-ENETUNREACH);
854 }
855 if (dst->dev == dev) { /* is this necessary? */
856 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
857 dst_release(dst);
858 return ERR_PTR(-ELOOP);
859 }
860
861 if (use_cache)
862 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
863 return dst;
864 }
865 #endif
866
867 /* Convert 64 bit tunnel ID to 24 bit VNI. */
868 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
869 {
870 #ifdef __BIG_ENDIAN
871 vni[0] = (__force __u8)(tun_id >> 16);
872 vni[1] = (__force __u8)(tun_id >> 8);
873 vni[2] = (__force __u8)tun_id;
874 #else
875 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
876 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
877 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
878 #endif
879 }
880
881 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
882 struct ip_tunnel_info *info)
883 {
884 struct geneve_dev *geneve = netdev_priv(dev);
885 struct geneve_sock *gs4 = geneve->sock4;
886 struct rtable *rt = NULL;
887 const struct iphdr *iip; /* interior IP header */
888 int err = -EINVAL;
889 struct flowi4 fl4;
890 __u8 tos, ttl;
891 __be16 sport;
892 __be16 df;
893 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
894 u32 flags = geneve->flags;
895
896 if (geneve->collect_md) {
897 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
898 netdev_dbg(dev, "no tunnel metadata\n");
899 goto tx_error;
900 }
901 if (info && ip_tunnel_info_af(info) != AF_INET)
902 goto tx_error;
903 }
904
905 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
906 if (IS_ERR(rt)) {
907 err = PTR_ERR(rt);
908 goto tx_error;
909 }
910
911 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
912 skb_reset_mac_header(skb);
913
914 iip = ip_hdr(skb);
915
916 if (info) {
917 const struct ip_tunnel_key *key = &info->key;
918 u8 *opts = NULL;
919 u8 vni[3];
920
921 tunnel_id_to_vni(key->tun_id, vni);
922 if (info->options_len)
923 opts = ip_tunnel_info_opts(info);
924
925 if (key->tun_flags & TUNNEL_CSUM)
926 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
927 else
928 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
929
930 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
931 info->options_len, opts, flags, xnet);
932 if (unlikely(err))
933 goto tx_error;
934
935 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
936 ttl = key->ttl;
937 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
938 } else {
939 err = geneve_build_skb(rt, skb, 0, geneve->vni,
940 0, NULL, flags, xnet);
941 if (unlikely(err))
942 goto tx_error;
943
944 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
945 ttl = geneve->ttl;
946 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
947 ttl = 1;
948 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
949 df = 0;
950 }
951 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
952 tos, ttl, df, sport, geneve->dst_port,
953 !net_eq(geneve->net, dev_net(geneve->dev)),
954 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
955
956 return NETDEV_TX_OK;
957
958 tx_error:
959 dev_kfree_skb(skb);
960
961 if (err == -ELOOP)
962 dev->stats.collisions++;
963 else if (err == -ENETUNREACH)
964 dev->stats.tx_carrier_errors++;
965 else
966 dev->stats.tx_errors++;
967 return NETDEV_TX_OK;
968 }
969
970 #if IS_ENABLED(CONFIG_IPV6)
971 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
972 struct ip_tunnel_info *info)
973 {
974 struct geneve_dev *geneve = netdev_priv(dev);
975 struct geneve_sock *gs6 = geneve->sock6;
976 struct dst_entry *dst = NULL;
977 const struct iphdr *iip; /* interior IP header */
978 int err = -EINVAL;
979 struct flowi6 fl6;
980 __u8 prio, ttl;
981 __be16 sport;
982 __be32 label;
983 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
984 u32 flags = geneve->flags;
985
986 if (geneve->collect_md) {
987 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
988 netdev_dbg(dev, "no tunnel metadata\n");
989 goto tx_error;
990 }
991 }
992
993 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
994 if (IS_ERR(dst)) {
995 err = PTR_ERR(dst);
996 goto tx_error;
997 }
998
999 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1000 skb_reset_mac_header(skb);
1001
1002 iip = ip_hdr(skb);
1003
1004 if (info) {
1005 const struct ip_tunnel_key *key = &info->key;
1006 u8 *opts = NULL;
1007 u8 vni[3];
1008
1009 tunnel_id_to_vni(key->tun_id, vni);
1010 if (info->options_len)
1011 opts = ip_tunnel_info_opts(info);
1012
1013 if (key->tun_flags & TUNNEL_CSUM)
1014 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1015 else
1016 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1017
1018 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1019 info->options_len, opts,
1020 flags, xnet);
1021 if (unlikely(err))
1022 goto tx_error;
1023
1024 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1025 ttl = key->ttl;
1026 label = info->key.label;
1027 } else {
1028 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1029 0, NULL, flags, xnet);
1030 if (unlikely(err))
1031 goto tx_error;
1032
1033 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1034 iip, skb);
1035 ttl = geneve->ttl;
1036 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1037 ttl = 1;
1038 ttl = ttl ? : ip6_dst_hoplimit(dst);
1039 label = geneve->label;
1040 }
1041
1042 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1043 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1044 sport, geneve->dst_port,
1045 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1046 return NETDEV_TX_OK;
1047
1048 tx_error:
1049 dev_kfree_skb(skb);
1050
1051 if (err == -ELOOP)
1052 dev->stats.collisions++;
1053 else if (err == -ENETUNREACH)
1054 dev->stats.tx_carrier_errors++;
1055 else
1056 dev->stats.tx_errors++;
1057 return NETDEV_TX_OK;
1058 }
1059 #endif
1060
1061 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1062 {
1063 struct geneve_dev *geneve = netdev_priv(dev);
1064 struct ip_tunnel_info *info = NULL;
1065
1066 if (geneve->collect_md)
1067 info = skb_tunnel_info(skb);
1068
1069 #if IS_ENABLED(CONFIG_IPV6)
1070 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1071 (!info && geneve->remote.sa.sa_family == AF_INET6))
1072 return geneve6_xmit_skb(skb, dev, info);
1073 #endif
1074 return geneve_xmit_skb(skb, dev, info);
1075 }
1076
1077 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1078 {
1079 /* The max_mtu calculation does not take account of GENEVE
1080 * options, to avoid excluding potentially valid
1081 * configurations.
1082 */
1083 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1084 - dev->hard_header_len;
1085
1086 if (new_mtu < 68)
1087 return -EINVAL;
1088
1089 if (new_mtu > max_mtu) {
1090 if (strict)
1091 return -EINVAL;
1092
1093 new_mtu = max_mtu;
1094 }
1095
1096 dev->mtu = new_mtu;
1097 return 0;
1098 }
1099
1100 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1101 {
1102 return __geneve_change_mtu(dev, new_mtu, true);
1103 }
1104
1105 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1106 {
1107 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1108 struct geneve_dev *geneve = netdev_priv(dev);
1109 struct rtable *rt;
1110 struct flowi4 fl4;
1111 #if IS_ENABLED(CONFIG_IPV6)
1112 struct dst_entry *dst;
1113 struct flowi6 fl6;
1114 #endif
1115
1116 if (ip_tunnel_info_af(info) == AF_INET) {
1117 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1118 if (IS_ERR(rt))
1119 return PTR_ERR(rt);
1120
1121 ip_rt_put(rt);
1122 info->key.u.ipv4.src = fl4.saddr;
1123 #if IS_ENABLED(CONFIG_IPV6)
1124 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1125 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1126 if (IS_ERR(dst))
1127 return PTR_ERR(dst);
1128
1129 dst_release(dst);
1130 info->key.u.ipv6.src = fl6.saddr;
1131 #endif
1132 } else {
1133 return -EINVAL;
1134 }
1135
1136 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1137 1, USHRT_MAX, true);
1138 info->key.tp_dst = geneve->dst_port;
1139 return 0;
1140 }
1141
1142 static const struct net_device_ops geneve_netdev_ops = {
1143 .ndo_init = geneve_init,
1144 .ndo_uninit = geneve_uninit,
1145 .ndo_open = geneve_open,
1146 .ndo_stop = geneve_stop,
1147 .ndo_start_xmit = geneve_xmit,
1148 .ndo_get_stats64 = ip_tunnel_get_stats64,
1149 .ndo_change_mtu = geneve_change_mtu,
1150 .ndo_validate_addr = eth_validate_addr,
1151 .ndo_set_mac_address = eth_mac_addr,
1152 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1153 };
1154
1155 static void geneve_get_drvinfo(struct net_device *dev,
1156 struct ethtool_drvinfo *drvinfo)
1157 {
1158 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1159 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1160 }
1161
1162 static const struct ethtool_ops geneve_ethtool_ops = {
1163 .get_drvinfo = geneve_get_drvinfo,
1164 .get_link = ethtool_op_get_link,
1165 };
1166
1167 /* Info for udev, that this is a virtual tunnel endpoint */
1168 static struct device_type geneve_type = {
1169 .name = "geneve",
1170 };
1171
1172 /* Calls the ndo_add_geneve_port of the caller in order to
1173 * supply the listening GENEVE udp ports. Callers are expected
1174 * to implement the ndo_add_geneve_port.
1175 */
1176 static void geneve_push_rx_ports(struct net_device *dev)
1177 {
1178 struct net *net = dev_net(dev);
1179 struct geneve_net *gn = net_generic(net, geneve_net_id);
1180 struct geneve_sock *gs;
1181 sa_family_t sa_family;
1182 struct sock *sk;
1183 __be16 port;
1184
1185 if (!dev->netdev_ops->ndo_add_geneve_port)
1186 return;
1187
1188 rcu_read_lock();
1189 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1190 sk = gs->sock->sk;
1191 sa_family = sk->sk_family;
1192 port = inet_sk(sk)->inet_sport;
1193 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1194 }
1195 rcu_read_unlock();
1196 }
1197
1198 /* Initialize the device structure. */
1199 static void geneve_setup(struct net_device *dev)
1200 {
1201 ether_setup(dev);
1202
1203 dev->netdev_ops = &geneve_netdev_ops;
1204 dev->ethtool_ops = &geneve_ethtool_ops;
1205 dev->destructor = free_netdev;
1206
1207 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1208
1209 dev->features |= NETIF_F_LLTX;
1210 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1211 dev->features |= NETIF_F_RXCSUM;
1212 dev->features |= NETIF_F_GSO_SOFTWARE;
1213
1214 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1215 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1216
1217 netif_keep_dst(dev);
1218 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1219 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1220 eth_hw_addr_random(dev);
1221 }
1222
1223 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1224 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1225 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1226 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1227 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1228 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1229 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1230 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1231 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1232 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1233 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1234 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1235 };
1236
1237 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1238 {
1239 if (tb[IFLA_ADDRESS]) {
1240 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1241 return -EINVAL;
1242
1243 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1244 return -EADDRNOTAVAIL;
1245 }
1246
1247 if (!data)
1248 return -EINVAL;
1249
1250 if (data[IFLA_GENEVE_ID]) {
1251 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1252
1253 if (vni >= GENEVE_VID_MASK)
1254 return -ERANGE;
1255 }
1256
1257 return 0;
1258 }
1259
1260 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1261 __be16 dst_port,
1262 union geneve_addr *remote,
1263 u8 vni[],
1264 bool *tun_on_same_port,
1265 bool *tun_collect_md)
1266 {
1267 struct geneve_dev *geneve, *t;
1268
1269 *tun_on_same_port = false;
1270 *tun_collect_md = false;
1271 t = NULL;
1272 list_for_each_entry(geneve, &gn->geneve_list, next) {
1273 if (geneve->dst_port == dst_port) {
1274 *tun_collect_md = geneve->collect_md;
1275 *tun_on_same_port = true;
1276 }
1277 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1278 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1279 dst_port == geneve->dst_port)
1280 t = geneve;
1281 }
1282 return t;
1283 }
1284
1285 static int geneve_configure(struct net *net, struct net_device *dev,
1286 union geneve_addr *remote,
1287 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1288 __be16 dst_port, bool metadata, u32 flags)
1289 {
1290 struct geneve_net *gn = net_generic(net, geneve_net_id);
1291 struct geneve_dev *t, *geneve = netdev_priv(dev);
1292 bool tun_collect_md, tun_on_same_port;
1293 int err, encap_len;
1294
1295 if (!remote)
1296 return -EINVAL;
1297 if (metadata &&
1298 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1299 return -EINVAL;
1300
1301 geneve->net = net;
1302 geneve->dev = dev;
1303
1304 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1305 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1306 geneve->vni[2] = vni & 0x000000ff;
1307
1308 if ((remote->sa.sa_family == AF_INET &&
1309 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1310 (remote->sa.sa_family == AF_INET6 &&
1311 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1312 return -EINVAL;
1313 if (label && remote->sa.sa_family != AF_INET6)
1314 return -EINVAL;
1315
1316 geneve->remote = *remote;
1317
1318 geneve->ttl = ttl;
1319 geneve->tos = tos;
1320 geneve->label = label;
1321 geneve->dst_port = dst_port;
1322 geneve->collect_md = metadata;
1323 geneve->flags = flags;
1324
1325 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1326 &tun_on_same_port, &tun_collect_md);
1327 if (t)
1328 return -EBUSY;
1329
1330 /* make enough headroom for basic scenario */
1331 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1332 if (remote->sa.sa_family == AF_INET)
1333 encap_len += sizeof(struct iphdr);
1334 else
1335 encap_len += sizeof(struct ipv6hdr);
1336 dev->needed_headroom = encap_len + ETH_HLEN;
1337
1338 if (metadata) {
1339 if (tun_on_same_port)
1340 return -EPERM;
1341 } else {
1342 if (tun_collect_md)
1343 return -EPERM;
1344 }
1345
1346 dst_cache_reset(&geneve->dst_cache);
1347
1348 err = register_netdevice(dev);
1349 if (err)
1350 return err;
1351
1352 list_add(&geneve->next, &gn->geneve_list);
1353 return 0;
1354 }
1355
1356 static int geneve_newlink(struct net *net, struct net_device *dev,
1357 struct nlattr *tb[], struct nlattr *data[])
1358 {
1359 __be16 dst_port = htons(GENEVE_UDP_PORT);
1360 __u8 ttl = 0, tos = 0;
1361 bool metadata = false;
1362 union geneve_addr remote = geneve_remote_unspec;
1363 __be32 label = 0;
1364 __u32 vni = 0;
1365 u32 flags = 0;
1366
1367 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1368 return -EINVAL;
1369
1370 if (data[IFLA_GENEVE_REMOTE]) {
1371 remote.sa.sa_family = AF_INET;
1372 remote.sin.sin_addr.s_addr =
1373 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1374 }
1375
1376 if (data[IFLA_GENEVE_REMOTE6]) {
1377 if (!IS_ENABLED(CONFIG_IPV6))
1378 return -EPFNOSUPPORT;
1379
1380 remote.sa.sa_family = AF_INET6;
1381 remote.sin6.sin6_addr =
1382 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1383
1384 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1385 IPV6_ADDR_LINKLOCAL) {
1386 netdev_dbg(dev, "link-local remote is unsupported\n");
1387 return -EINVAL;
1388 }
1389 }
1390
1391 if (data[IFLA_GENEVE_ID])
1392 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1393
1394 if (data[IFLA_GENEVE_TTL])
1395 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1396
1397 if (data[IFLA_GENEVE_TOS])
1398 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1399
1400 if (data[IFLA_GENEVE_LABEL])
1401 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1402 IPV6_FLOWLABEL_MASK;
1403
1404 if (data[IFLA_GENEVE_PORT])
1405 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1406
1407 if (data[IFLA_GENEVE_COLLECT_METADATA])
1408 metadata = true;
1409
1410 if (data[IFLA_GENEVE_UDP_CSUM] &&
1411 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1412 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1413
1414 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1415 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1416 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1417
1418 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1419 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1420 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1421
1422 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1423 dst_port, metadata, flags);
1424 }
1425
1426 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1427 {
1428 struct geneve_dev *geneve = netdev_priv(dev);
1429
1430 list_del(&geneve->next);
1431 unregister_netdevice_queue(dev, head);
1432 }
1433
1434 static size_t geneve_get_size(const struct net_device *dev)
1435 {
1436 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1437 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1438 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1439 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1440 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1441 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1442 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1443 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1444 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1445 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1446 0;
1447 }
1448
1449 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1450 {
1451 struct geneve_dev *geneve = netdev_priv(dev);
1452 __u32 vni;
1453
1454 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1455 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1456 goto nla_put_failure;
1457
1458 if (geneve->remote.sa.sa_family == AF_INET) {
1459 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1460 geneve->remote.sin.sin_addr.s_addr))
1461 goto nla_put_failure;
1462 #if IS_ENABLED(CONFIG_IPV6)
1463 } else {
1464 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1465 &geneve->remote.sin6.sin6_addr))
1466 goto nla_put_failure;
1467 #endif
1468 }
1469
1470 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1471 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1472 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1473 goto nla_put_failure;
1474
1475 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1476 goto nla_put_failure;
1477
1478 if (geneve->collect_md) {
1479 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1480 goto nla_put_failure;
1481 }
1482
1483 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1484 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1485 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1486 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1487 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1488 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1489 goto nla_put_failure;
1490
1491 return 0;
1492
1493 nla_put_failure:
1494 return -EMSGSIZE;
1495 }
1496
1497 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1498 .kind = "geneve",
1499 .maxtype = IFLA_GENEVE_MAX,
1500 .policy = geneve_policy,
1501 .priv_size = sizeof(struct geneve_dev),
1502 .setup = geneve_setup,
1503 .validate = geneve_validate,
1504 .newlink = geneve_newlink,
1505 .dellink = geneve_dellink,
1506 .get_size = geneve_get_size,
1507 .fill_info = geneve_fill_info,
1508 };
1509
1510 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1511 u8 name_assign_type, u16 dst_port)
1512 {
1513 struct nlattr *tb[IFLA_MAX + 1];
1514 struct net_device *dev;
1515 int err;
1516
1517 memset(tb, 0, sizeof(tb));
1518 dev = rtnl_create_link(net, name, name_assign_type,
1519 &geneve_link_ops, tb);
1520 if (IS_ERR(dev))
1521 return dev;
1522
1523 err = geneve_configure(net, dev, &geneve_remote_unspec,
1524 0, 0, 0, 0, htons(dst_port), true,
1525 GENEVE_F_UDP_ZERO_CSUM6_RX);
1526 if (err)
1527 goto err;
1528
1529 /* openvswitch users expect packet sizes to be unrestricted,
1530 * so set the largest MTU we can.
1531 */
1532 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1533 if (err)
1534 goto err;
1535
1536 return dev;
1537
1538 err:
1539 free_netdev(dev);
1540 return ERR_PTR(err);
1541 }
1542 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1543
1544 static int geneve_netdevice_event(struct notifier_block *unused,
1545 unsigned long event, void *ptr)
1546 {
1547 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1548
1549 if (event == NETDEV_OFFLOAD_PUSH_GENEVE)
1550 geneve_push_rx_ports(dev);
1551
1552 return NOTIFY_DONE;
1553 }
1554
1555 static struct notifier_block geneve_notifier_block __read_mostly = {
1556 .notifier_call = geneve_netdevice_event,
1557 };
1558
1559 static __net_init int geneve_init_net(struct net *net)
1560 {
1561 struct geneve_net *gn = net_generic(net, geneve_net_id);
1562
1563 INIT_LIST_HEAD(&gn->geneve_list);
1564 INIT_LIST_HEAD(&gn->sock_list);
1565 return 0;
1566 }
1567
1568 static void __net_exit geneve_exit_net(struct net *net)
1569 {
1570 struct geneve_net *gn = net_generic(net, geneve_net_id);
1571 struct geneve_dev *geneve, *next;
1572 struct net_device *dev, *aux;
1573 LIST_HEAD(list);
1574
1575 rtnl_lock();
1576
1577 /* gather any geneve devices that were moved into this ns */
1578 for_each_netdev_safe(net, dev, aux)
1579 if (dev->rtnl_link_ops == &geneve_link_ops)
1580 unregister_netdevice_queue(dev, &list);
1581
1582 /* now gather any other geneve devices that were created in this ns */
1583 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1584 /* If geneve->dev is in the same netns, it was already added
1585 * to the list by the previous loop.
1586 */
1587 if (!net_eq(dev_net(geneve->dev), net))
1588 unregister_netdevice_queue(geneve->dev, &list);
1589 }
1590
1591 /* unregister the devices gathered above */
1592 unregister_netdevice_many(&list);
1593 rtnl_unlock();
1594 }
1595
1596 static struct pernet_operations geneve_net_ops = {
1597 .init = geneve_init_net,
1598 .exit = geneve_exit_net,
1599 .id = &geneve_net_id,
1600 .size = sizeof(struct geneve_net),
1601 };
1602
1603 static int __init geneve_init_module(void)
1604 {
1605 int rc;
1606
1607 rc = register_pernet_subsys(&geneve_net_ops);
1608 if (rc)
1609 goto out1;
1610
1611 rc = register_netdevice_notifier(&geneve_notifier_block);
1612 if (rc)
1613 goto out2;
1614
1615 rc = rtnl_link_register(&geneve_link_ops);
1616 if (rc)
1617 goto out3;
1618
1619 return 0;
1620
1621 out3:
1622 unregister_netdevice_notifier(&geneve_notifier_block);
1623 out2:
1624 unregister_pernet_subsys(&geneve_net_ops);
1625 out1:
1626 return rc;
1627 }
1628 late_initcall(geneve_init_module);
1629
1630 static void __exit geneve_cleanup_module(void)
1631 {
1632 rtnl_link_unregister(&geneve_link_ops);
1633 unregister_netdevice_notifier(&geneve_notifier_block);
1634 unregister_pernet_subsys(&geneve_net_ops);
1635 }
1636 module_exit(geneve_cleanup_module);
1637
1638 MODULE_LICENSE("GPL");
1639 MODULE_VERSION(GENEVE_NETDEV_VER);
1640 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1641 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1642 MODULE_ALIAS_RTNL_LINK("geneve");
Linux kernel - Deliverables
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