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[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 __be16 dst_port;
72 bool collect_md;
73 struct gro_cells gro_cells;
74 u32 flags;
75 };
76
77 /* Geneve device flags */
78 #define GENEVE_F_UDP_CSUM BIT(0)
79 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
80 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
81
82 struct geneve_sock {
83 bool collect_md;
84 struct list_head list;
85 struct socket *sock;
86 struct rcu_head rcu;
87 int refcnt;
88 struct udp_offload udp_offloads;
89 struct hlist_head vni_list[VNI_HASH_SIZE];
90 u32 flags;
91 };
92
93 static inline __u32 geneve_net_vni_hash(u8 vni[3])
94 {
95 __u32 vnid;
96
97 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
98 return hash_32(vnid, VNI_HASH_BITS);
99 }
100
101 static __be64 vni_to_tunnel_id(const __u8 *vni)
102 {
103 #ifdef __BIG_ENDIAN
104 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
105 #else
106 return (__force __be64)(((__force u64)vni[0] << 40) |
107 ((__force u64)vni[1] << 48) |
108 ((__force u64)vni[2] << 56));
109 #endif
110 }
111
112 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
113 __be32 addr, u8 vni[])
114 {
115 struct hlist_head *vni_list_head;
116 struct geneve_dev *geneve;
117 __u32 hash;
118
119 /* Find the device for this VNI */
120 hash = geneve_net_vni_hash(vni);
121 vni_list_head = &gs->vni_list[hash];
122 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
123 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
124 addr == geneve->remote.sin.sin_addr.s_addr)
125 return geneve;
126 }
127 return NULL;
128 }
129
130 #if IS_ENABLED(CONFIG_IPV6)
131 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
132 struct in6_addr addr6, u8 vni[])
133 {
134 struct hlist_head *vni_list_head;
135 struct geneve_dev *geneve;
136 __u32 hash;
137
138 /* Find the device for this VNI */
139 hash = geneve_net_vni_hash(vni);
140 vni_list_head = &gs->vni_list[hash];
141 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
142 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
143 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
144 return geneve;
145 }
146 return NULL;
147 }
148 #endif
149
150 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
151 {
152 return (struct genevehdr *)(udp_hdr(skb) + 1);
153 }
154
155 /* geneve receive/decap routine */
156 static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
157 {
158 struct genevehdr *gnvh = geneve_hdr(skb);
159 struct metadata_dst *tun_dst = NULL;
160 struct geneve_dev *geneve = NULL;
161 struct pcpu_sw_netstats *stats;
162 struct iphdr *iph = NULL;
163 __be32 addr;
164 static u8 zero_vni[3];
165 u8 *vni;
166 int err = 0;
167 sa_family_t sa_family;
168 #if IS_ENABLED(CONFIG_IPV6)
169 struct ipv6hdr *ip6h = NULL;
170 struct in6_addr addr6;
171 static struct in6_addr zero_addr6;
172 #endif
173
174 sa_family = gs->sock->sk->sk_family;
175
176 if (sa_family == AF_INET) {
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 = gnvh->vni;
184
185 addr = iph->saddr;
186 }
187
188 geneve = geneve_lookup(gs, addr, vni);
189 #if IS_ENABLED(CONFIG_IPV6)
190 } else if (sa_family == AF_INET6) {
191 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
192
193 if (gs->collect_md) {
194 vni = zero_vni;
195 addr6 = zero_addr6;
196 } else {
197 vni = gnvh->vni;
198
199 addr6 = ip6h->saddr;
200 }
201
202 geneve = geneve6_lookup(gs, addr6, vni);
203 #endif
204 }
205 if (!geneve)
206 goto drop;
207
208 if (ip_tunnel_collect_metadata() || gs->collect_md) {
209 __be16 flags;
210
211 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
212 (gnvh->oam ? TUNNEL_OAM : 0) |
213 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
214
215 tun_dst = udp_tun_rx_dst(skb, sa_family, flags,
216 vni_to_tunnel_id(gnvh->vni),
217 gnvh->opt_len * 4);
218 if (!tun_dst)
219 goto drop;
220 /* Update tunnel dst according to Geneve options. */
221 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
222 gnvh->options, gnvh->opt_len * 4);
223 } else {
224 /* Drop packets w/ critical options,
225 * since we don't support any...
226 */
227 if (gnvh->critical)
228 goto drop;
229 }
230
231 skb_reset_mac_header(skb);
232 skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
233 skb->protocol = eth_type_trans(skb, geneve->dev);
234 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
235
236 if (tun_dst)
237 skb_dst_set(skb, &tun_dst->dst);
238
239 /* Ignore packet loops (and multicast echo) */
240 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
241 goto drop;
242
243 skb_reset_network_header(skb);
244
245 if (iph)
246 err = IP_ECN_decapsulate(iph, skb);
247 #if IS_ENABLED(CONFIG_IPV6)
248 if (ip6h)
249 err = IP6_ECN_decapsulate(ip6h, skb);
250 #endif
251
252 if (unlikely(err)) {
253 if (log_ecn_error) {
254 if (iph)
255 net_info_ratelimited("non-ECT from %pI4 "
256 "with TOS=%#x\n",
257 &iph->saddr, iph->tos);
258 #if IS_ENABLED(CONFIG_IPV6)
259 if (ip6h)
260 net_info_ratelimited("non-ECT from %pI6\n",
261 &ip6h->saddr);
262 #endif
263 }
264 if (err > 1) {
265 ++geneve->dev->stats.rx_frame_errors;
266 ++geneve->dev->stats.rx_errors;
267 goto drop;
268 }
269 }
270
271 stats = this_cpu_ptr(geneve->dev->tstats);
272 u64_stats_update_begin(&stats->syncp);
273 stats->rx_packets++;
274 stats->rx_bytes += skb->len;
275 u64_stats_update_end(&stats->syncp);
276
277 gro_cells_receive(&geneve->gro_cells, skb);
278 return;
279 drop:
280 /* Consume bad packet */
281 kfree_skb(skb);
282 }
283
284 /* Setup stats when device is created */
285 static int geneve_init(struct net_device *dev)
286 {
287 struct geneve_dev *geneve = netdev_priv(dev);
288 int err;
289
290 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
291 if (!dev->tstats)
292 return -ENOMEM;
293
294 err = gro_cells_init(&geneve->gro_cells, dev);
295 if (err) {
296 free_percpu(dev->tstats);
297 return err;
298 }
299
300 return 0;
301 }
302
303 static void geneve_uninit(struct net_device *dev)
304 {
305 struct geneve_dev *geneve = netdev_priv(dev);
306
307 gro_cells_destroy(&geneve->gro_cells);
308 free_percpu(dev->tstats);
309 }
310
311 /* Callback from net/ipv4/udp.c to receive packets */
312 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
313 {
314 struct genevehdr *geneveh;
315 struct geneve_sock *gs;
316 int opts_len;
317
318 /* Need Geneve and inner Ethernet header to be present */
319 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
320 goto error;
321
322 /* Return packets with reserved bits set */
323 geneveh = geneve_hdr(skb);
324 if (unlikely(geneveh->ver != GENEVE_VER))
325 goto error;
326
327 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
328 goto error;
329
330 opts_len = geneveh->opt_len * 4;
331 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
332 htons(ETH_P_TEB)))
333 goto drop;
334
335 gs = rcu_dereference_sk_user_data(sk);
336 if (!gs)
337 goto drop;
338
339 geneve_rx(gs, skb);
340 return 0;
341
342 drop:
343 /* Consume bad packet */
344 kfree_skb(skb);
345 return 0;
346
347 error:
348 /* Let the UDP layer deal with the skb */
349 return 1;
350 }
351
352 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
353 __be16 port, u32 flags)
354 {
355 struct socket *sock;
356 struct udp_port_cfg udp_conf;
357 int err;
358
359 memset(&udp_conf, 0, sizeof(udp_conf));
360
361 if (ipv6) {
362 udp_conf.family = AF_INET6;
363 udp_conf.ipv6_v6only = 1;
364 udp_conf.use_udp6_rx_checksums =
365 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
366 } else {
367 udp_conf.family = AF_INET;
368 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
369 }
370
371 udp_conf.local_udp_port = port;
372
373 /* Open UDP socket */
374 err = udp_sock_create(net, &udp_conf, &sock);
375 if (err < 0)
376 return ERR_PTR(err);
377
378 return sock;
379 }
380
381 static void geneve_notify_add_rx_port(struct geneve_sock *gs)
382 {
383 struct net_device *dev;
384 struct sock *sk = gs->sock->sk;
385 struct net *net = sock_net(sk);
386 sa_family_t sa_family = sk->sk_family;
387 __be16 port = inet_sk(sk)->inet_sport;
388 int err;
389
390 if (sa_family == AF_INET) {
391 err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
392 if (err)
393 pr_warn("geneve: udp_add_offload failed with status %d\n",
394 err);
395 }
396
397 rcu_read_lock();
398 for_each_netdev_rcu(net, dev) {
399 if (dev->netdev_ops->ndo_add_geneve_port)
400 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
401 port);
402 }
403 rcu_read_unlock();
404 }
405
406 static int geneve_hlen(struct genevehdr *gh)
407 {
408 return sizeof(*gh) + gh->opt_len * 4;
409 }
410
411 static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
412 struct sk_buff *skb,
413 struct udp_offload *uoff)
414 {
415 struct sk_buff *p, **pp = NULL;
416 struct genevehdr *gh, *gh2;
417 unsigned int hlen, gh_len, off_gnv;
418 const struct packet_offload *ptype;
419 __be16 type;
420 int flush = 1;
421
422 off_gnv = skb_gro_offset(skb);
423 hlen = off_gnv + sizeof(*gh);
424 gh = skb_gro_header_fast(skb, off_gnv);
425 if (skb_gro_header_hard(skb, hlen)) {
426 gh = skb_gro_header_slow(skb, hlen, off_gnv);
427 if (unlikely(!gh))
428 goto out;
429 }
430
431 if (gh->ver != GENEVE_VER || gh->oam)
432 goto out;
433 gh_len = geneve_hlen(gh);
434
435 hlen = off_gnv + gh_len;
436 if (skb_gro_header_hard(skb, hlen)) {
437 gh = skb_gro_header_slow(skb, hlen, off_gnv);
438 if (unlikely(!gh))
439 goto out;
440 }
441
442 flush = 0;
443
444 for (p = *head; p; p = p->next) {
445 if (!NAPI_GRO_CB(p)->same_flow)
446 continue;
447
448 gh2 = (struct genevehdr *)(p->data + off_gnv);
449 if (gh->opt_len != gh2->opt_len ||
450 memcmp(gh, gh2, gh_len)) {
451 NAPI_GRO_CB(p)->same_flow = 0;
452 continue;
453 }
454 }
455
456 type = gh->proto_type;
457
458 rcu_read_lock();
459 ptype = gro_find_receive_by_type(type);
460 if (!ptype) {
461 flush = 1;
462 goto out_unlock;
463 }
464
465 skb_gro_pull(skb, gh_len);
466 skb_gro_postpull_rcsum(skb, gh, gh_len);
467 pp = ptype->callbacks.gro_receive(head, skb);
468
469 out_unlock:
470 rcu_read_unlock();
471 out:
472 NAPI_GRO_CB(skb)->flush |= flush;
473
474 return pp;
475 }
476
477 static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
478 struct udp_offload *uoff)
479 {
480 struct genevehdr *gh;
481 struct packet_offload *ptype;
482 __be16 type;
483 int gh_len;
484 int err = -ENOSYS;
485
486 udp_tunnel_gro_complete(skb, nhoff);
487
488 gh = (struct genevehdr *)(skb->data + nhoff);
489 gh_len = geneve_hlen(gh);
490 type = gh->proto_type;
491
492 rcu_read_lock();
493 ptype = gro_find_complete_by_type(type);
494 if (ptype)
495 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
496
497 rcu_read_unlock();
498 return err;
499 }
500
501 /* Create new listen socket if needed */
502 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
503 bool ipv6, u32 flags)
504 {
505 struct geneve_net *gn = net_generic(net, geneve_net_id);
506 struct geneve_sock *gs;
507 struct socket *sock;
508 struct udp_tunnel_sock_cfg tunnel_cfg;
509 int h;
510
511 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
512 if (!gs)
513 return ERR_PTR(-ENOMEM);
514
515 sock = geneve_create_sock(net, ipv6, port, flags);
516 if (IS_ERR(sock)) {
517 kfree(gs);
518 return ERR_CAST(sock);
519 }
520
521 gs->sock = sock;
522 gs->refcnt = 1;
523 for (h = 0; h < VNI_HASH_SIZE; ++h)
524 INIT_HLIST_HEAD(&gs->vni_list[h]);
525
526 /* Initialize the geneve udp offloads structure */
527 gs->udp_offloads.port = port;
528 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
529 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
530 geneve_notify_add_rx_port(gs);
531
532 /* Mark socket as an encapsulation socket */
533 tunnel_cfg.sk_user_data = gs;
534 tunnel_cfg.encap_type = 1;
535 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
536 tunnel_cfg.encap_destroy = NULL;
537 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
538 list_add(&gs->list, &gn->sock_list);
539 return gs;
540 }
541
542 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
543 {
544 struct net_device *dev;
545 struct sock *sk = gs->sock->sk;
546 struct net *net = sock_net(sk);
547 sa_family_t sa_family = sk->sk_family;
548 __be16 port = inet_sk(sk)->inet_sport;
549
550 rcu_read_lock();
551 for_each_netdev_rcu(net, dev) {
552 if (dev->netdev_ops->ndo_del_geneve_port)
553 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
554 port);
555 }
556
557 rcu_read_unlock();
558
559 if (sa_family == AF_INET)
560 udp_del_offload(&gs->udp_offloads);
561 }
562
563 static void __geneve_sock_release(struct geneve_sock *gs)
564 {
565 if (!gs || --gs->refcnt)
566 return;
567
568 list_del(&gs->list);
569 geneve_notify_del_rx_port(gs);
570 udp_tunnel_sock_release(gs->sock);
571 kfree_rcu(gs, rcu);
572 }
573
574 static void geneve_sock_release(struct geneve_dev *geneve)
575 {
576 __geneve_sock_release(geneve->sock4);
577 #if IS_ENABLED(CONFIG_IPV6)
578 __geneve_sock_release(geneve->sock6);
579 #endif
580 }
581
582 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
583 sa_family_t family,
584 __be16 dst_port)
585 {
586 struct geneve_sock *gs;
587
588 list_for_each_entry(gs, &gn->sock_list, list) {
589 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
590 inet_sk(gs->sock->sk)->sk.sk_family == family) {
591 return gs;
592 }
593 }
594 return NULL;
595 }
596
597 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
598 {
599 struct net *net = geneve->net;
600 struct geneve_net *gn = net_generic(net, geneve_net_id);
601 struct geneve_sock *gs;
602 __u32 hash;
603
604 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
605 if (gs) {
606 gs->refcnt++;
607 goto out;
608 }
609
610 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
611 if (IS_ERR(gs))
612 return PTR_ERR(gs);
613
614 out:
615 gs->collect_md = geneve->collect_md;
616 gs->flags = geneve->flags;
617 #if IS_ENABLED(CONFIG_IPV6)
618 if (ipv6)
619 geneve->sock6 = gs;
620 else
621 #endif
622 geneve->sock4 = gs;
623
624 hash = geneve_net_vni_hash(geneve->vni);
625 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
626 return 0;
627 }
628
629 static int geneve_open(struct net_device *dev)
630 {
631 struct geneve_dev *geneve = netdev_priv(dev);
632 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
633 bool metadata = geneve->collect_md;
634 int ret = 0;
635
636 geneve->sock4 = NULL;
637 #if IS_ENABLED(CONFIG_IPV6)
638 geneve->sock6 = NULL;
639 if (ipv6 || metadata)
640 ret = geneve_sock_add(geneve, true);
641 #endif
642 if (!ret && (!ipv6 || metadata))
643 ret = geneve_sock_add(geneve, false);
644 if (ret < 0)
645 geneve_sock_release(geneve);
646
647 return ret;
648 }
649
650 static int geneve_stop(struct net_device *dev)
651 {
652 struct geneve_dev *geneve = netdev_priv(dev);
653
654 if (!hlist_unhashed(&geneve->hlist))
655 hlist_del_rcu(&geneve->hlist);
656 geneve_sock_release(geneve);
657 return 0;
658 }
659
660 static void geneve_build_header(struct genevehdr *geneveh,
661 __be16 tun_flags, u8 vni[3],
662 u8 options_len, u8 *options)
663 {
664 geneveh->ver = GENEVE_VER;
665 geneveh->opt_len = options_len / 4;
666 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
667 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
668 geneveh->rsvd1 = 0;
669 memcpy(geneveh->vni, vni, 3);
670 geneveh->proto_type = htons(ETH_P_TEB);
671 geneveh->rsvd2 = 0;
672
673 memcpy(geneveh->options, options, options_len);
674 }
675
676 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
677 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
678 u32 flags, bool xnet)
679 {
680 struct genevehdr *gnvh;
681 int min_headroom;
682 int err;
683 bool udp_sum = !!(flags & GENEVE_F_UDP_CSUM);
684
685 skb_scrub_packet(skb, xnet);
686
687 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
688 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
689 err = skb_cow_head(skb, min_headroom);
690 if (unlikely(err)) {
691 kfree_skb(skb);
692 goto free_rt;
693 }
694
695 skb = udp_tunnel_handle_offloads(skb, udp_sum);
696 if (IS_ERR(skb)) {
697 err = PTR_ERR(skb);
698 goto free_rt;
699 }
700
701 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
702 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
703
704 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
705 return 0;
706
707 free_rt:
708 ip_rt_put(rt);
709 return err;
710 }
711
712 #if IS_ENABLED(CONFIG_IPV6)
713 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
714 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
715 u32 flags, bool xnet)
716 {
717 struct genevehdr *gnvh;
718 int min_headroom;
719 int err;
720 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
721
722 skb_scrub_packet(skb, xnet);
723
724 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
725 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
726 err = skb_cow_head(skb, min_headroom);
727 if (unlikely(err)) {
728 kfree_skb(skb);
729 goto free_dst;
730 }
731
732 skb = udp_tunnel_handle_offloads(skb, udp_sum);
733 if (IS_ERR(skb)) {
734 err = PTR_ERR(skb);
735 goto free_dst;
736 }
737
738 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
739 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
740
741 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
742 return 0;
743
744 free_dst:
745 dst_release(dst);
746 return err;
747 }
748 #endif
749
750 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
751 struct net_device *dev,
752 struct flowi4 *fl4,
753 struct ip_tunnel_info *info)
754 {
755 struct geneve_dev *geneve = netdev_priv(dev);
756 struct rtable *rt = NULL;
757 __u8 tos;
758
759 memset(fl4, 0, sizeof(*fl4));
760 fl4->flowi4_mark = skb->mark;
761 fl4->flowi4_proto = IPPROTO_UDP;
762
763 if (info) {
764 fl4->daddr = info->key.u.ipv4.dst;
765 fl4->saddr = info->key.u.ipv4.src;
766 fl4->flowi4_tos = RT_TOS(info->key.tos);
767 } else {
768 tos = geneve->tos;
769 if (tos == 1) {
770 const struct iphdr *iip = ip_hdr(skb);
771
772 tos = ip_tunnel_get_dsfield(iip, skb);
773 }
774
775 fl4->flowi4_tos = RT_TOS(tos);
776 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
777 }
778
779 rt = ip_route_output_key(geneve->net, fl4);
780 if (IS_ERR(rt)) {
781 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
782 return ERR_PTR(-ENETUNREACH);
783 }
784 if (rt->dst.dev == dev) { /* is this necessary? */
785 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
786 ip_rt_put(rt);
787 return ERR_PTR(-ELOOP);
788 }
789 return rt;
790 }
791
792 #if IS_ENABLED(CONFIG_IPV6)
793 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
794 struct net_device *dev,
795 struct flowi6 *fl6,
796 struct ip_tunnel_info *info)
797 {
798 struct geneve_dev *geneve = netdev_priv(dev);
799 struct geneve_sock *gs6 = geneve->sock6;
800 struct dst_entry *dst = NULL;
801 __u8 prio;
802
803 memset(fl6, 0, sizeof(*fl6));
804 fl6->flowi6_mark = skb->mark;
805 fl6->flowi6_proto = IPPROTO_UDP;
806
807 if (info) {
808 fl6->daddr = info->key.u.ipv6.dst;
809 fl6->saddr = info->key.u.ipv6.src;
810 fl6->flowi6_tos = RT_TOS(info->key.tos);
811 } else {
812 prio = geneve->tos;
813 if (prio == 1) {
814 const struct iphdr *iip = ip_hdr(skb);
815
816 prio = ip_tunnel_get_dsfield(iip, skb);
817 }
818
819 fl6->flowi6_tos = RT_TOS(prio);
820 fl6->daddr = geneve->remote.sin6.sin6_addr;
821 }
822
823 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
824 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
825 return ERR_PTR(-ENETUNREACH);
826 }
827 if (dst->dev == dev) { /* is this necessary? */
828 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
829 dst_release(dst);
830 return ERR_PTR(-ELOOP);
831 }
832
833 return dst;
834 }
835 #endif
836
837 /* Convert 64 bit tunnel ID to 24 bit VNI. */
838 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
839 {
840 #ifdef __BIG_ENDIAN
841 vni[0] = (__force __u8)(tun_id >> 16);
842 vni[1] = (__force __u8)(tun_id >> 8);
843 vni[2] = (__force __u8)tun_id;
844 #else
845 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
846 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
847 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
848 #endif
849 }
850
851 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
852 struct ip_tunnel_info *info)
853 {
854 struct geneve_dev *geneve = netdev_priv(dev);
855 struct geneve_sock *gs4 = geneve->sock4;
856 struct rtable *rt = NULL;
857 const struct iphdr *iip; /* interior IP header */
858 int err = -EINVAL;
859 struct flowi4 fl4;
860 __u8 tos, ttl;
861 __be16 sport;
862 __be16 df;
863 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
864 u32 flags = geneve->flags;
865
866 if (geneve->collect_md) {
867 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
868 netdev_dbg(dev, "no tunnel metadata\n");
869 goto tx_error;
870 }
871 if (info && ip_tunnel_info_af(info) != AF_INET)
872 goto tx_error;
873 }
874
875 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
876 if (IS_ERR(rt)) {
877 err = PTR_ERR(rt);
878 goto tx_error;
879 }
880
881 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
882 skb_reset_mac_header(skb);
883
884 iip = ip_hdr(skb);
885
886 if (info) {
887 const struct ip_tunnel_key *key = &info->key;
888 u8 *opts = NULL;
889 u8 vni[3];
890
891 tunnel_id_to_vni(key->tun_id, vni);
892 if (key->tun_flags & TUNNEL_GENEVE_OPT)
893 opts = ip_tunnel_info_opts(info);
894
895 if (key->tun_flags & TUNNEL_CSUM)
896 flags |= GENEVE_F_UDP_CSUM;
897 else
898 flags &= ~GENEVE_F_UDP_CSUM;
899
900 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
901 info->options_len, opts, flags, xnet);
902 if (unlikely(err))
903 goto err;
904
905 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
906 ttl = key->ttl;
907 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
908 } else {
909 err = geneve_build_skb(rt, skb, 0, geneve->vni,
910 0, NULL, flags, xnet);
911 if (unlikely(err))
912 goto err;
913
914 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
915 ttl = geneve->ttl;
916 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
917 ttl = 1;
918 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
919 df = 0;
920 }
921 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
922 tos, ttl, df, sport, geneve->dst_port,
923 !net_eq(geneve->net, dev_net(geneve->dev)),
924 !(flags & GENEVE_F_UDP_CSUM));
925
926 return NETDEV_TX_OK;
927
928 tx_error:
929 dev_kfree_skb(skb);
930 err:
931 if (err == -ELOOP)
932 dev->stats.collisions++;
933 else if (err == -ENETUNREACH)
934 dev->stats.tx_carrier_errors++;
935 else
936 dev->stats.tx_errors++;
937 return NETDEV_TX_OK;
938 }
939
940 #if IS_ENABLED(CONFIG_IPV6)
941 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
942 struct ip_tunnel_info *info)
943 {
944 struct geneve_dev *geneve = netdev_priv(dev);
945 struct geneve_sock *gs6 = geneve->sock6;
946 struct dst_entry *dst = NULL;
947 const struct iphdr *iip; /* interior IP header */
948 int err = -EINVAL;
949 struct flowi6 fl6;
950 __u8 prio, ttl;
951 __be16 sport;
952 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
953 u32 flags = geneve->flags;
954
955 if (geneve->collect_md) {
956 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
957 netdev_dbg(dev, "no tunnel metadata\n");
958 goto tx_error;
959 }
960 }
961
962 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
963 if (IS_ERR(dst)) {
964 err = PTR_ERR(dst);
965 goto tx_error;
966 }
967
968 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
969 skb_reset_mac_header(skb);
970
971 iip = ip_hdr(skb);
972
973 if (info) {
974 const struct ip_tunnel_key *key = &info->key;
975 u8 *opts = NULL;
976 u8 vni[3];
977
978 tunnel_id_to_vni(key->tun_id, vni);
979 if (key->tun_flags & TUNNEL_GENEVE_OPT)
980 opts = ip_tunnel_info_opts(info);
981
982 if (key->tun_flags & TUNNEL_CSUM)
983 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
984 else
985 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
986
987 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
988 info->options_len, opts,
989 flags, xnet);
990 if (unlikely(err))
991 goto err;
992
993 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
994 ttl = key->ttl;
995 } else {
996 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
997 0, NULL, flags, xnet);
998 if (unlikely(err))
999 goto err;
1000
1001 prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
1002 ttl = geneve->ttl;
1003 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1004 ttl = 1;
1005 ttl = ttl ? : ip6_dst_hoplimit(dst);
1006 }
1007 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1008 &fl6.saddr, &fl6.daddr, prio, ttl,
1009 sport, geneve->dst_port,
1010 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1011 return NETDEV_TX_OK;
1012
1013 tx_error:
1014 dev_kfree_skb(skb);
1015 err:
1016 if (err == -ELOOP)
1017 dev->stats.collisions++;
1018 else if (err == -ENETUNREACH)
1019 dev->stats.tx_carrier_errors++;
1020 else
1021 dev->stats.tx_errors++;
1022 return NETDEV_TX_OK;
1023 }
1024 #endif
1025
1026 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1027 {
1028 struct geneve_dev *geneve = netdev_priv(dev);
1029 struct ip_tunnel_info *info = NULL;
1030
1031 if (geneve->collect_md)
1032 info = skb_tunnel_info(skb);
1033
1034 #if IS_ENABLED(CONFIG_IPV6)
1035 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1036 (!info && geneve->remote.sa.sa_family == AF_INET6))
1037 return geneve6_xmit_skb(skb, dev, info);
1038 #endif
1039 return geneve_xmit_skb(skb, dev, info);
1040 }
1041
1042 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1043 {
1044 /* The max_mtu calculation does not take account of GENEVE
1045 * options, to avoid excluding potentially valid
1046 * configurations.
1047 */
1048 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1049 - dev->hard_header_len;
1050
1051 if (new_mtu < 68)
1052 return -EINVAL;
1053
1054 if (new_mtu > max_mtu) {
1055 if (strict)
1056 return -EINVAL;
1057
1058 new_mtu = max_mtu;
1059 }
1060
1061 dev->mtu = new_mtu;
1062 return 0;
1063 }
1064
1065 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1066 {
1067 return __geneve_change_mtu(dev, new_mtu, true);
1068 }
1069
1070 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1071 {
1072 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1073 struct geneve_dev *geneve = netdev_priv(dev);
1074 struct rtable *rt;
1075 struct flowi4 fl4;
1076 #if IS_ENABLED(CONFIG_IPV6)
1077 struct dst_entry *dst;
1078 struct flowi6 fl6;
1079 #endif
1080
1081 if (ip_tunnel_info_af(info) == AF_INET) {
1082 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1083 if (IS_ERR(rt))
1084 return PTR_ERR(rt);
1085
1086 ip_rt_put(rt);
1087 info->key.u.ipv4.src = fl4.saddr;
1088 #if IS_ENABLED(CONFIG_IPV6)
1089 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1090 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1091 if (IS_ERR(dst))
1092 return PTR_ERR(dst);
1093
1094 dst_release(dst);
1095 info->key.u.ipv6.src = fl6.saddr;
1096 #endif
1097 } else {
1098 return -EINVAL;
1099 }
1100
1101 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1102 1, USHRT_MAX, true);
1103 info->key.tp_dst = geneve->dst_port;
1104 return 0;
1105 }
1106
1107 static const struct net_device_ops geneve_netdev_ops = {
1108 .ndo_init = geneve_init,
1109 .ndo_uninit = geneve_uninit,
1110 .ndo_open = geneve_open,
1111 .ndo_stop = geneve_stop,
1112 .ndo_start_xmit = geneve_xmit,
1113 .ndo_get_stats64 = ip_tunnel_get_stats64,
1114 .ndo_change_mtu = geneve_change_mtu,
1115 .ndo_validate_addr = eth_validate_addr,
1116 .ndo_set_mac_address = eth_mac_addr,
1117 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1118 };
1119
1120 static void geneve_get_drvinfo(struct net_device *dev,
1121 struct ethtool_drvinfo *drvinfo)
1122 {
1123 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1124 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1125 }
1126
1127 static const struct ethtool_ops geneve_ethtool_ops = {
1128 .get_drvinfo = geneve_get_drvinfo,
1129 .get_link = ethtool_op_get_link,
1130 };
1131
1132 /* Info for udev, that this is a virtual tunnel endpoint */
1133 static struct device_type geneve_type = {
1134 .name = "geneve",
1135 };
1136
1137 /* Calls the ndo_add_geneve_port of the caller in order to
1138 * supply the listening GENEVE udp ports. Callers are expected
1139 * to implement the ndo_add_geneve_port.
1140 */
1141 void geneve_get_rx_port(struct net_device *dev)
1142 {
1143 struct net *net = dev_net(dev);
1144 struct geneve_net *gn = net_generic(net, geneve_net_id);
1145 struct geneve_sock *gs;
1146 sa_family_t sa_family;
1147 struct sock *sk;
1148 __be16 port;
1149
1150 rcu_read_lock();
1151 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1152 sk = gs->sock->sk;
1153 sa_family = sk->sk_family;
1154 port = inet_sk(sk)->inet_sport;
1155 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1156 }
1157 rcu_read_unlock();
1158 }
1159 EXPORT_SYMBOL_GPL(geneve_get_rx_port);
1160
1161 /* Initialize the device structure. */
1162 static void geneve_setup(struct net_device *dev)
1163 {
1164 ether_setup(dev);
1165
1166 dev->netdev_ops = &geneve_netdev_ops;
1167 dev->ethtool_ops = &geneve_ethtool_ops;
1168 dev->destructor = free_netdev;
1169
1170 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1171
1172 dev->features |= NETIF_F_LLTX;
1173 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1174 dev->features |= NETIF_F_RXCSUM;
1175 dev->features |= NETIF_F_GSO_SOFTWARE;
1176
1177 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1178 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1179
1180 netif_keep_dst(dev);
1181 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1182 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1183 eth_hw_addr_random(dev);
1184 }
1185
1186 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1187 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1188 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1189 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1190 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1191 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1192 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1193 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1194 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1195 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1196 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1197 };
1198
1199 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1200 {
1201 if (tb[IFLA_ADDRESS]) {
1202 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1203 return -EINVAL;
1204
1205 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1206 return -EADDRNOTAVAIL;
1207 }
1208
1209 if (!data)
1210 return -EINVAL;
1211
1212 if (data[IFLA_GENEVE_ID]) {
1213 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1214
1215 if (vni >= GENEVE_VID_MASK)
1216 return -ERANGE;
1217 }
1218
1219 return 0;
1220 }
1221
1222 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1223 __be16 dst_port,
1224 union geneve_addr *remote,
1225 u8 vni[],
1226 bool *tun_on_same_port,
1227 bool *tun_collect_md)
1228 {
1229 struct geneve_dev *geneve, *t;
1230
1231 *tun_on_same_port = false;
1232 *tun_collect_md = false;
1233 t = NULL;
1234 list_for_each_entry(geneve, &gn->geneve_list, next) {
1235 if (geneve->dst_port == dst_port) {
1236 *tun_collect_md = geneve->collect_md;
1237 *tun_on_same_port = true;
1238 }
1239 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1240 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1241 dst_port == geneve->dst_port)
1242 t = geneve;
1243 }
1244 return t;
1245 }
1246
1247 static int geneve_configure(struct net *net, struct net_device *dev,
1248 union geneve_addr *remote,
1249 __u32 vni, __u8 ttl, __u8 tos, __be16 dst_port,
1250 bool metadata, u32 flags)
1251 {
1252 struct geneve_net *gn = net_generic(net, geneve_net_id);
1253 struct geneve_dev *t, *geneve = netdev_priv(dev);
1254 bool tun_collect_md, tun_on_same_port;
1255 int err, encap_len;
1256
1257 if (!remote)
1258 return -EINVAL;
1259 if (metadata &&
1260 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl))
1261 return -EINVAL;
1262
1263 geneve->net = net;
1264 geneve->dev = dev;
1265
1266 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1267 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1268 geneve->vni[2] = vni & 0x000000ff;
1269
1270 if ((remote->sa.sa_family == AF_INET &&
1271 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1272 (remote->sa.sa_family == AF_INET6 &&
1273 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1274 return -EINVAL;
1275 geneve->remote = *remote;
1276
1277 geneve->ttl = ttl;
1278 geneve->tos = tos;
1279 geneve->dst_port = dst_port;
1280 geneve->collect_md = metadata;
1281 geneve->flags = flags;
1282
1283 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1284 &tun_on_same_port, &tun_collect_md);
1285 if (t)
1286 return -EBUSY;
1287
1288 /* make enough headroom for basic scenario */
1289 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1290 if (remote->sa.sa_family == AF_INET)
1291 encap_len += sizeof(struct iphdr);
1292 else
1293 encap_len += sizeof(struct ipv6hdr);
1294 dev->needed_headroom = encap_len + ETH_HLEN;
1295
1296 if (metadata) {
1297 if (tun_on_same_port)
1298 return -EPERM;
1299 } else {
1300 if (tun_collect_md)
1301 return -EPERM;
1302 }
1303
1304 err = register_netdevice(dev);
1305 if (err)
1306 return err;
1307
1308 list_add(&geneve->next, &gn->geneve_list);
1309 return 0;
1310 }
1311
1312 static int geneve_newlink(struct net *net, struct net_device *dev,
1313 struct nlattr *tb[], struct nlattr *data[])
1314 {
1315 __be16 dst_port = htons(GENEVE_UDP_PORT);
1316 __u8 ttl = 0, tos = 0;
1317 bool metadata = false;
1318 union geneve_addr remote = geneve_remote_unspec;
1319 __u32 vni = 0;
1320 u32 flags = 0;
1321
1322 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1323 return -EINVAL;
1324
1325 if (data[IFLA_GENEVE_REMOTE]) {
1326 remote.sa.sa_family = AF_INET;
1327 remote.sin.sin_addr.s_addr =
1328 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1329 }
1330
1331 if (data[IFLA_GENEVE_REMOTE6]) {
1332 if (!IS_ENABLED(CONFIG_IPV6))
1333 return -EPFNOSUPPORT;
1334
1335 remote.sa.sa_family = AF_INET6;
1336 remote.sin6.sin6_addr =
1337 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1338
1339 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1340 IPV6_ADDR_LINKLOCAL) {
1341 netdev_dbg(dev, "link-local remote is unsupported\n");
1342 return -EINVAL;
1343 }
1344 }
1345
1346 if (data[IFLA_GENEVE_ID])
1347 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1348
1349 if (data[IFLA_GENEVE_TTL])
1350 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1351
1352 if (data[IFLA_GENEVE_TOS])
1353 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1354
1355 if (data[IFLA_GENEVE_PORT])
1356 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1357
1358 if (data[IFLA_GENEVE_COLLECT_METADATA])
1359 metadata = true;
1360
1361 if (data[IFLA_GENEVE_UDP_CSUM] &&
1362 nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1363 flags |= GENEVE_F_UDP_CSUM;
1364
1365 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1366 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1367 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1368
1369 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1370 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1371 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1372
1373 return geneve_configure(net, dev, &remote, vni, ttl, tos, dst_port,
1374 metadata, flags);
1375 }
1376
1377 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1378 {
1379 struct geneve_dev *geneve = netdev_priv(dev);
1380
1381 list_del(&geneve->next);
1382 unregister_netdevice_queue(dev, head);
1383 }
1384
1385 static size_t geneve_get_size(const struct net_device *dev)
1386 {
1387 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1388 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1389 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1390 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1391 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1392 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1393 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1394 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1395 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1396 0;
1397 }
1398
1399 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1400 {
1401 struct geneve_dev *geneve = netdev_priv(dev);
1402 __u32 vni;
1403
1404 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1405 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1406 goto nla_put_failure;
1407
1408 if (geneve->remote.sa.sa_family == AF_INET) {
1409 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1410 geneve->remote.sin.sin_addr.s_addr))
1411 goto nla_put_failure;
1412 #if IS_ENABLED(CONFIG_IPV6)
1413 } else {
1414 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1415 &geneve->remote.sin6.sin6_addr))
1416 goto nla_put_failure;
1417 #endif
1418 }
1419
1420 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1421 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
1422 goto nla_put_failure;
1423
1424 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1425 goto nla_put_failure;
1426
1427 if (geneve->collect_md) {
1428 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1429 goto nla_put_failure;
1430 }
1431
1432 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1433 !!(geneve->flags & GENEVE_F_UDP_CSUM)) ||
1434 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1435 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1436 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1437 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1438 goto nla_put_failure;
1439
1440 return 0;
1441
1442 nla_put_failure:
1443 return -EMSGSIZE;
1444 }
1445
1446 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1447 .kind = "geneve",
1448 .maxtype = IFLA_GENEVE_MAX,
1449 .policy = geneve_policy,
1450 .priv_size = sizeof(struct geneve_dev),
1451 .setup = geneve_setup,
1452 .validate = geneve_validate,
1453 .newlink = geneve_newlink,
1454 .dellink = geneve_dellink,
1455 .get_size = geneve_get_size,
1456 .fill_info = geneve_fill_info,
1457 };
1458
1459 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1460 u8 name_assign_type, u16 dst_port)
1461 {
1462 struct nlattr *tb[IFLA_MAX + 1];
1463 struct net_device *dev;
1464 int err;
1465
1466 memset(tb, 0, sizeof(tb));
1467 dev = rtnl_create_link(net, name, name_assign_type,
1468 &geneve_link_ops, tb);
1469 if (IS_ERR(dev))
1470 return dev;
1471
1472 err = geneve_configure(net, dev, &geneve_remote_unspec,
1473 0, 0, 0, htons(dst_port), true,
1474 GENEVE_F_UDP_ZERO_CSUM6_RX);
1475 if (err)
1476 goto err;
1477
1478 /* openvswitch users expect packet sizes to be unrestricted,
1479 * so set the largest MTU we can.
1480 */
1481 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1482 if (err)
1483 goto err;
1484
1485 return dev;
1486
1487 err:
1488 free_netdev(dev);
1489 return ERR_PTR(err);
1490 }
1491 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1492
1493 static __net_init int geneve_init_net(struct net *net)
1494 {
1495 struct geneve_net *gn = net_generic(net, geneve_net_id);
1496
1497 INIT_LIST_HEAD(&gn->geneve_list);
1498 INIT_LIST_HEAD(&gn->sock_list);
1499 return 0;
1500 }
1501
1502 static void __net_exit geneve_exit_net(struct net *net)
1503 {
1504 struct geneve_net *gn = net_generic(net, geneve_net_id);
1505 struct geneve_dev *geneve, *next;
1506 struct net_device *dev, *aux;
1507 LIST_HEAD(list);
1508
1509 rtnl_lock();
1510
1511 /* gather any geneve devices that were moved into this ns */
1512 for_each_netdev_safe(net, dev, aux)
1513 if (dev->rtnl_link_ops == &geneve_link_ops)
1514 unregister_netdevice_queue(dev, &list);
1515
1516 /* now gather any other geneve devices that were created in this ns */
1517 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1518 /* If geneve->dev is in the same netns, it was already added
1519 * to the list by the previous loop.
1520 */
1521 if (!net_eq(dev_net(geneve->dev), net))
1522 unregister_netdevice_queue(geneve->dev, &list);
1523 }
1524
1525 /* unregister the devices gathered above */
1526 unregister_netdevice_many(&list);
1527 rtnl_unlock();
1528 }
1529
1530 static struct pernet_operations geneve_net_ops = {
1531 .init = geneve_init_net,
1532 .exit = geneve_exit_net,
1533 .id = &geneve_net_id,
1534 .size = sizeof(struct geneve_net),
1535 };
1536
1537 static int __init geneve_init_module(void)
1538 {
1539 int rc;
1540
1541 rc = register_pernet_subsys(&geneve_net_ops);
1542 if (rc)
1543 goto out1;
1544
1545 rc = rtnl_link_register(&geneve_link_ops);
1546 if (rc)
1547 goto out2;
1548
1549 return 0;
1550 out2:
1551 unregister_pernet_subsys(&geneve_net_ops);
1552 out1:
1553 return rc;
1554 }
1555 late_initcall(geneve_init_module);
1556
1557 static void __exit geneve_cleanup_module(void)
1558 {
1559 rtnl_link_unregister(&geneve_link_ops);
1560 unregister_pernet_subsys(&geneve_net_ops);
1561 }
1562 module_exit(geneve_cleanup_module);
1563
1564 MODULE_LICENSE("GPL");
1565 MODULE_VERSION(GENEVE_NETDEV_VER);
1566 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1567 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1568 MODULE_ALIAS_RTNL_LINK("geneve");
Linux kernel - Deliverables
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