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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 struct dst_cache dst_cache;
76 };
77
78 /* Geneve device flags */
79 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
80 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
81 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
82
83 struct geneve_sock {
84 bool collect_md;
85 struct list_head list;
86 struct socket *sock;
87 struct rcu_head rcu;
88 int refcnt;
89 struct udp_offload udp_offloads;
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 int err;
412
413 if (sa_family == AF_INET) {
414 err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
415 if (err)
416 pr_warn("geneve: udp_add_offload failed with status %d\n",
417 err);
418 }
419
420 rcu_read_lock();
421 for_each_netdev_rcu(net, dev) {
422 if (dev->netdev_ops->ndo_add_geneve_port)
423 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
424 port);
425 }
426 rcu_read_unlock();
427 }
428
429 static int geneve_hlen(struct genevehdr *gh)
430 {
431 return sizeof(*gh) + gh->opt_len * 4;
432 }
433
434 static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
435 struct sk_buff *skb,
436 struct udp_offload *uoff)
437 {
438 struct sk_buff *p, **pp = NULL;
439 struct genevehdr *gh, *gh2;
440 unsigned int hlen, gh_len, off_gnv;
441 const struct packet_offload *ptype;
442 __be16 type;
443 int flush = 1;
444
445 off_gnv = skb_gro_offset(skb);
446 hlen = off_gnv + sizeof(*gh);
447 gh = skb_gro_header_fast(skb, off_gnv);
448 if (skb_gro_header_hard(skb, hlen)) {
449 gh = skb_gro_header_slow(skb, hlen, off_gnv);
450 if (unlikely(!gh))
451 goto out;
452 }
453
454 if (gh->ver != GENEVE_VER || gh->oam)
455 goto out;
456 gh_len = geneve_hlen(gh);
457
458 hlen = off_gnv + gh_len;
459 if (skb_gro_header_hard(skb, hlen)) {
460 gh = skb_gro_header_slow(skb, hlen, off_gnv);
461 if (unlikely(!gh))
462 goto out;
463 }
464
465 flush = 0;
466
467 for (p = *head; p; p = p->next) {
468 if (!NAPI_GRO_CB(p)->same_flow)
469 continue;
470
471 gh2 = (struct genevehdr *)(p->data + off_gnv);
472 if (gh->opt_len != gh2->opt_len ||
473 memcmp(gh, gh2, gh_len)) {
474 NAPI_GRO_CB(p)->same_flow = 0;
475 continue;
476 }
477 }
478
479 type = gh->proto_type;
480
481 rcu_read_lock();
482 ptype = gro_find_receive_by_type(type);
483 if (!ptype) {
484 flush = 1;
485 goto out_unlock;
486 }
487
488 skb_gro_pull(skb, gh_len);
489 skb_gro_postpull_rcsum(skb, gh, gh_len);
490 pp = ptype->callbacks.gro_receive(head, skb);
491
492 out_unlock:
493 rcu_read_unlock();
494 out:
495 NAPI_GRO_CB(skb)->flush |= flush;
496
497 return pp;
498 }
499
500 static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
501 struct udp_offload *uoff)
502 {
503 struct genevehdr *gh;
504 struct packet_offload *ptype;
505 __be16 type;
506 int gh_len;
507 int err = -ENOSYS;
508
509 udp_tunnel_gro_complete(skb, nhoff);
510
511 gh = (struct genevehdr *)(skb->data + nhoff);
512 gh_len = geneve_hlen(gh);
513 type = gh->proto_type;
514
515 rcu_read_lock();
516 ptype = gro_find_complete_by_type(type);
517 if (ptype)
518 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
519
520 rcu_read_unlock();
521 return err;
522 }
523
524 /* Create new listen socket if needed */
525 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
526 bool ipv6, u32 flags)
527 {
528 struct geneve_net *gn = net_generic(net, geneve_net_id);
529 struct geneve_sock *gs;
530 struct socket *sock;
531 struct udp_tunnel_sock_cfg tunnel_cfg;
532 int h;
533
534 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
535 if (!gs)
536 return ERR_PTR(-ENOMEM);
537
538 sock = geneve_create_sock(net, ipv6, port, flags);
539 if (IS_ERR(sock)) {
540 kfree(gs);
541 return ERR_CAST(sock);
542 }
543
544 gs->sock = sock;
545 gs->refcnt = 1;
546 for (h = 0; h < VNI_HASH_SIZE; ++h)
547 INIT_HLIST_HEAD(&gs->vni_list[h]);
548
549 /* Initialize the geneve udp offloads structure */
550 gs->udp_offloads.port = port;
551 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
552 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
553 geneve_notify_add_rx_port(gs);
554
555 /* Mark socket as an encapsulation socket */
556 tunnel_cfg.sk_user_data = gs;
557 tunnel_cfg.encap_type = 1;
558 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
559 tunnel_cfg.encap_destroy = NULL;
560 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
561 list_add(&gs->list, &gn->sock_list);
562 return gs;
563 }
564
565 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
566 {
567 struct net_device *dev;
568 struct sock *sk = gs->sock->sk;
569 struct net *net = sock_net(sk);
570 sa_family_t sa_family = geneve_get_sk_family(gs);
571 __be16 port = inet_sk(sk)->inet_sport;
572
573 rcu_read_lock();
574 for_each_netdev_rcu(net, dev) {
575 if (dev->netdev_ops->ndo_del_geneve_port)
576 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
577 port);
578 }
579
580 rcu_read_unlock();
581
582 if (sa_family == AF_INET)
583 udp_del_offload(&gs->udp_offloads);
584 }
585
586 static void __geneve_sock_release(struct geneve_sock *gs)
587 {
588 if (!gs || --gs->refcnt)
589 return;
590
591 list_del(&gs->list);
592 geneve_notify_del_rx_port(gs);
593 udp_tunnel_sock_release(gs->sock);
594 kfree_rcu(gs, rcu);
595 }
596
597 static void geneve_sock_release(struct geneve_dev *geneve)
598 {
599 __geneve_sock_release(geneve->sock4);
600 #if IS_ENABLED(CONFIG_IPV6)
601 __geneve_sock_release(geneve->sock6);
602 #endif
603 }
604
605 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
606 sa_family_t family,
607 __be16 dst_port)
608 {
609 struct geneve_sock *gs;
610
611 list_for_each_entry(gs, &gn->sock_list, list) {
612 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
613 geneve_get_sk_family(gs) == family) {
614 return gs;
615 }
616 }
617 return NULL;
618 }
619
620 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
621 {
622 struct net *net = geneve->net;
623 struct geneve_net *gn = net_generic(net, geneve_net_id);
624 struct geneve_sock *gs;
625 __u32 hash;
626
627 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
628 if (gs) {
629 gs->refcnt++;
630 goto out;
631 }
632
633 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
634 if (IS_ERR(gs))
635 return PTR_ERR(gs);
636
637 out:
638 gs->collect_md = geneve->collect_md;
639 gs->flags = geneve->flags;
640 #if IS_ENABLED(CONFIG_IPV6)
641 if (ipv6)
642 geneve->sock6 = gs;
643 else
644 #endif
645 geneve->sock4 = gs;
646
647 hash = geneve_net_vni_hash(geneve->vni);
648 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
649 return 0;
650 }
651
652 static int geneve_open(struct net_device *dev)
653 {
654 struct geneve_dev *geneve = netdev_priv(dev);
655 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
656 bool metadata = geneve->collect_md;
657 int ret = 0;
658
659 geneve->sock4 = NULL;
660 #if IS_ENABLED(CONFIG_IPV6)
661 geneve->sock6 = NULL;
662 if (ipv6 || metadata)
663 ret = geneve_sock_add(geneve, true);
664 #endif
665 if (!ret && (!ipv6 || metadata))
666 ret = geneve_sock_add(geneve, false);
667 if (ret < 0)
668 geneve_sock_release(geneve);
669
670 return ret;
671 }
672
673 static int geneve_stop(struct net_device *dev)
674 {
675 struct geneve_dev *geneve = netdev_priv(dev);
676
677 if (!hlist_unhashed(&geneve->hlist))
678 hlist_del_rcu(&geneve->hlist);
679 geneve_sock_release(geneve);
680 return 0;
681 }
682
683 static void geneve_build_header(struct genevehdr *geneveh,
684 __be16 tun_flags, u8 vni[3],
685 u8 options_len, u8 *options)
686 {
687 geneveh->ver = GENEVE_VER;
688 geneveh->opt_len = options_len / 4;
689 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
690 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
691 geneveh->rsvd1 = 0;
692 memcpy(geneveh->vni, vni, 3);
693 geneveh->proto_type = htons(ETH_P_TEB);
694 geneveh->rsvd2 = 0;
695
696 memcpy(geneveh->options, options, options_len);
697 }
698
699 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
700 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
701 u32 flags, bool xnet)
702 {
703 struct genevehdr *gnvh;
704 int min_headroom;
705 int err;
706 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
707
708 skb_scrub_packet(skb, xnet);
709
710 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
711 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
712 err = skb_cow_head(skb, min_headroom);
713 if (unlikely(err)) {
714 kfree_skb(skb);
715 goto free_rt;
716 }
717
718 skb = udp_tunnel_handle_offloads(skb, udp_sum);
719 if (IS_ERR(skb)) {
720 err = PTR_ERR(skb);
721 goto free_rt;
722 }
723
724 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
725 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
726
727 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
728 return 0;
729
730 free_rt:
731 ip_rt_put(rt);
732 return err;
733 }
734
735 #if IS_ENABLED(CONFIG_IPV6)
736 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
737 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
738 u32 flags, bool xnet)
739 {
740 struct genevehdr *gnvh;
741 int min_headroom;
742 int err;
743 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
744
745 skb_scrub_packet(skb, xnet);
746
747 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
748 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
749 err = skb_cow_head(skb, min_headroom);
750 if (unlikely(err)) {
751 kfree_skb(skb);
752 goto free_dst;
753 }
754
755 skb = udp_tunnel_handle_offloads(skb, udp_sum);
756 if (IS_ERR(skb)) {
757 err = PTR_ERR(skb);
758 goto free_dst;
759 }
760
761 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
762 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
763
764 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
765 return 0;
766
767 free_dst:
768 dst_release(dst);
769 return err;
770 }
771 #endif
772
773 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
774 struct net_device *dev,
775 struct flowi4 *fl4,
776 struct ip_tunnel_info *info)
777 {
778 struct geneve_dev *geneve = netdev_priv(dev);
779 struct dst_cache *dst_cache;
780 struct rtable *rt = NULL;
781 bool use_cache = true;
782 __u8 tos;
783
784 memset(fl4, 0, sizeof(*fl4));
785 fl4->flowi4_mark = skb->mark;
786 fl4->flowi4_proto = IPPROTO_UDP;
787
788 if (info) {
789 fl4->daddr = info->key.u.ipv4.dst;
790 fl4->saddr = info->key.u.ipv4.src;
791 fl4->flowi4_tos = RT_TOS(info->key.tos);
792 dst_cache = &info->dst_cache;
793 } else {
794 tos = geneve->tos;
795 if (tos == 1) {
796 const struct iphdr *iip = ip_hdr(skb);
797
798 tos = ip_tunnel_get_dsfield(iip, skb);
799 use_cache = false;
800 }
801
802 fl4->flowi4_tos = RT_TOS(tos);
803 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
804 dst_cache = &geneve->dst_cache;
805 }
806
807 use_cache = use_cache && !skb->mark;
808 if (use_cache) {
809 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
810 if (rt)
811 return rt;
812 }
813
814 rt = ip_route_output_key(geneve->net, fl4);
815 if (IS_ERR(rt)) {
816 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
817 return ERR_PTR(-ENETUNREACH);
818 }
819 if (rt->dst.dev == dev) { /* is this necessary? */
820 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
821 ip_rt_put(rt);
822 return ERR_PTR(-ELOOP);
823 }
824 if (use_cache)
825 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
826 return rt;
827 }
828
829 #if IS_ENABLED(CONFIG_IPV6)
830 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
831 struct net_device *dev,
832 struct flowi6 *fl6,
833 struct ip_tunnel_info *info)
834 {
835 struct geneve_dev *geneve = netdev_priv(dev);
836 struct geneve_sock *gs6 = geneve->sock6;
837 struct dst_entry *dst = NULL;
838 struct dst_cache *dst_cache;
839 bool use_cache = true;
840 __u8 prio;
841
842 memset(fl6, 0, sizeof(*fl6));
843 fl6->flowi6_mark = skb->mark;
844 fl6->flowi6_proto = IPPROTO_UDP;
845
846 if (info) {
847 fl6->daddr = info->key.u.ipv6.dst;
848 fl6->saddr = info->key.u.ipv6.src;
849 fl6->flowi6_tos = RT_TOS(info->key.tos);
850 dst_cache = &info->dst_cache;
851 } else {
852 prio = geneve->tos;
853 if (prio == 1) {
854 const struct iphdr *iip = ip_hdr(skb);
855
856 prio = ip_tunnel_get_dsfield(iip, skb);
857 use_cache = false;
858 }
859
860 fl6->flowi6_tos = RT_TOS(prio);
861 fl6->daddr = geneve->remote.sin6.sin6_addr;
862 dst_cache = &geneve->dst_cache;
863 }
864
865 use_cache = use_cache && !skb->mark;
866 if (use_cache) {
867 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
868 if (dst)
869 return dst;
870 }
871
872 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
873 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
874 return ERR_PTR(-ENETUNREACH);
875 }
876 if (dst->dev == dev) { /* is this necessary? */
877 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
878 dst_release(dst);
879 return ERR_PTR(-ELOOP);
880 }
881
882 if (use_cache)
883 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
884 return dst;
885 }
886 #endif
887
888 /* Convert 64 bit tunnel ID to 24 bit VNI. */
889 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
890 {
891 #ifdef __BIG_ENDIAN
892 vni[0] = (__force __u8)(tun_id >> 16);
893 vni[1] = (__force __u8)(tun_id >> 8);
894 vni[2] = (__force __u8)tun_id;
895 #else
896 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
897 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
898 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
899 #endif
900 }
901
902 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
903 struct ip_tunnel_info *info)
904 {
905 struct geneve_dev *geneve = netdev_priv(dev);
906 struct geneve_sock *gs4 = geneve->sock4;
907 struct rtable *rt = NULL;
908 const struct iphdr *iip; /* interior IP header */
909 int err = -EINVAL;
910 struct flowi4 fl4;
911 __u8 tos, ttl;
912 __be16 sport;
913 __be16 df;
914 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
915 u32 flags = geneve->flags;
916
917 if (geneve->collect_md) {
918 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
919 netdev_dbg(dev, "no tunnel metadata\n");
920 goto tx_error;
921 }
922 if (info && ip_tunnel_info_af(info) != AF_INET)
923 goto tx_error;
924 }
925
926 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
927 if (IS_ERR(rt)) {
928 err = PTR_ERR(rt);
929 goto tx_error;
930 }
931
932 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
933 skb_reset_mac_header(skb);
934
935 iip = ip_hdr(skb);
936
937 if (info) {
938 const struct ip_tunnel_key *key = &info->key;
939 u8 *opts = NULL;
940 u8 vni[3];
941
942 tunnel_id_to_vni(key->tun_id, vni);
943 if (key->tun_flags & TUNNEL_GENEVE_OPT)
944 opts = ip_tunnel_info_opts(info);
945
946 if (key->tun_flags & TUNNEL_CSUM)
947 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
948 else
949 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
950
951 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
952 info->options_len, opts, flags, xnet);
953 if (unlikely(err))
954 goto err;
955
956 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
957 ttl = key->ttl;
958 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
959 } else {
960 err = geneve_build_skb(rt, skb, 0, geneve->vni,
961 0, NULL, flags, xnet);
962 if (unlikely(err))
963 goto err;
964
965 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
966 ttl = geneve->ttl;
967 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
968 ttl = 1;
969 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
970 df = 0;
971 }
972 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
973 tos, ttl, df, sport, geneve->dst_port,
974 !net_eq(geneve->net, dev_net(geneve->dev)),
975 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
976
977 return NETDEV_TX_OK;
978
979 tx_error:
980 dev_kfree_skb(skb);
981 err:
982 if (err == -ELOOP)
983 dev->stats.collisions++;
984 else if (err == -ENETUNREACH)
985 dev->stats.tx_carrier_errors++;
986 else
987 dev->stats.tx_errors++;
988 return NETDEV_TX_OK;
989 }
990
991 #if IS_ENABLED(CONFIG_IPV6)
992 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
993 struct ip_tunnel_info *info)
994 {
995 struct geneve_dev *geneve = netdev_priv(dev);
996 struct geneve_sock *gs6 = geneve->sock6;
997 struct dst_entry *dst = NULL;
998 const struct iphdr *iip; /* interior IP header */
999 int err = -EINVAL;
1000 struct flowi6 fl6;
1001 __u8 prio, ttl;
1002 __be16 sport;
1003 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1004 u32 flags = geneve->flags;
1005
1006 if (geneve->collect_md) {
1007 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1008 netdev_dbg(dev, "no tunnel metadata\n");
1009 goto tx_error;
1010 }
1011 }
1012
1013 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1014 if (IS_ERR(dst)) {
1015 err = PTR_ERR(dst);
1016 goto tx_error;
1017 }
1018
1019 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1020 skb_reset_mac_header(skb);
1021
1022 iip = ip_hdr(skb);
1023
1024 if (info) {
1025 const struct ip_tunnel_key *key = &info->key;
1026 u8 *opts = NULL;
1027 u8 vni[3];
1028
1029 tunnel_id_to_vni(key->tun_id, vni);
1030 if (key->tun_flags & TUNNEL_GENEVE_OPT)
1031 opts = ip_tunnel_info_opts(info);
1032
1033 if (key->tun_flags & TUNNEL_CSUM)
1034 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1035 else
1036 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1037
1038 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1039 info->options_len, opts,
1040 flags, xnet);
1041 if (unlikely(err))
1042 goto err;
1043
1044 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1045 ttl = key->ttl;
1046 } else {
1047 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1048 0, NULL, flags, xnet);
1049 if (unlikely(err))
1050 goto err;
1051
1052 prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
1053 ttl = geneve->ttl;
1054 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1055 ttl = 1;
1056 ttl = ttl ? : ip6_dst_hoplimit(dst);
1057 }
1058 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1059 &fl6.saddr, &fl6.daddr, prio, ttl,
1060 sport, geneve->dst_port,
1061 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1062 return NETDEV_TX_OK;
1063
1064 tx_error:
1065 dev_kfree_skb(skb);
1066 err:
1067 if (err == -ELOOP)
1068 dev->stats.collisions++;
1069 else if (err == -ENETUNREACH)
1070 dev->stats.tx_carrier_errors++;
1071 else
1072 dev->stats.tx_errors++;
1073 return NETDEV_TX_OK;
1074 }
1075 #endif
1076
1077 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1078 {
1079 struct geneve_dev *geneve = netdev_priv(dev);
1080 struct ip_tunnel_info *info = NULL;
1081
1082 if (geneve->collect_md)
1083 info = skb_tunnel_info(skb);
1084
1085 #if IS_ENABLED(CONFIG_IPV6)
1086 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1087 (!info && geneve->remote.sa.sa_family == AF_INET6))
1088 return geneve6_xmit_skb(skb, dev, info);
1089 #endif
1090 return geneve_xmit_skb(skb, dev, info);
1091 }
1092
1093 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1094 {
1095 /* The max_mtu calculation does not take account of GENEVE
1096 * options, to avoid excluding potentially valid
1097 * configurations.
1098 */
1099 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1100 - dev->hard_header_len;
1101
1102 if (new_mtu < 68)
1103 return -EINVAL;
1104
1105 if (new_mtu > max_mtu) {
1106 if (strict)
1107 return -EINVAL;
1108
1109 new_mtu = max_mtu;
1110 }
1111
1112 dev->mtu = new_mtu;
1113 return 0;
1114 }
1115
1116 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1117 {
1118 return __geneve_change_mtu(dev, new_mtu, true);
1119 }
1120
1121 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1122 {
1123 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1124 struct geneve_dev *geneve = netdev_priv(dev);
1125 struct rtable *rt;
1126 struct flowi4 fl4;
1127 #if IS_ENABLED(CONFIG_IPV6)
1128 struct dst_entry *dst;
1129 struct flowi6 fl6;
1130 #endif
1131
1132 if (ip_tunnel_info_af(info) == AF_INET) {
1133 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1134 if (IS_ERR(rt))
1135 return PTR_ERR(rt);
1136
1137 ip_rt_put(rt);
1138 info->key.u.ipv4.src = fl4.saddr;
1139 #if IS_ENABLED(CONFIG_IPV6)
1140 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1141 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1142 if (IS_ERR(dst))
1143 return PTR_ERR(dst);
1144
1145 dst_release(dst);
1146 info->key.u.ipv6.src = fl6.saddr;
1147 #endif
1148 } else {
1149 return -EINVAL;
1150 }
1151
1152 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1153 1, USHRT_MAX, true);
1154 info->key.tp_dst = geneve->dst_port;
1155 return 0;
1156 }
1157
1158 static const struct net_device_ops geneve_netdev_ops = {
1159 .ndo_init = geneve_init,
1160 .ndo_uninit = geneve_uninit,
1161 .ndo_open = geneve_open,
1162 .ndo_stop = geneve_stop,
1163 .ndo_start_xmit = geneve_xmit,
1164 .ndo_get_stats64 = ip_tunnel_get_stats64,
1165 .ndo_change_mtu = geneve_change_mtu,
1166 .ndo_validate_addr = eth_validate_addr,
1167 .ndo_set_mac_address = eth_mac_addr,
1168 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1169 };
1170
1171 static void geneve_get_drvinfo(struct net_device *dev,
1172 struct ethtool_drvinfo *drvinfo)
1173 {
1174 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1175 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1176 }
1177
1178 static const struct ethtool_ops geneve_ethtool_ops = {
1179 .get_drvinfo = geneve_get_drvinfo,
1180 .get_link = ethtool_op_get_link,
1181 };
1182
1183 /* Info for udev, that this is a virtual tunnel endpoint */
1184 static struct device_type geneve_type = {
1185 .name = "geneve",
1186 };
1187
1188 /* Calls the ndo_add_geneve_port of the caller in order to
1189 * supply the listening GENEVE udp ports. Callers are expected
1190 * to implement the ndo_add_geneve_port.
1191 */
1192 void geneve_get_rx_port(struct net_device *dev)
1193 {
1194 struct net *net = dev_net(dev);
1195 struct geneve_net *gn = net_generic(net, geneve_net_id);
1196 struct geneve_sock *gs;
1197 sa_family_t sa_family;
1198 struct sock *sk;
1199 __be16 port;
1200
1201 rcu_read_lock();
1202 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1203 sk = gs->sock->sk;
1204 sa_family = sk->sk_family;
1205 port = inet_sk(sk)->inet_sport;
1206 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1207 }
1208 rcu_read_unlock();
1209 }
1210 EXPORT_SYMBOL_GPL(geneve_get_rx_port);
1211
1212 /* Initialize the device structure. */
1213 static void geneve_setup(struct net_device *dev)
1214 {
1215 ether_setup(dev);
1216
1217 dev->netdev_ops = &geneve_netdev_ops;
1218 dev->ethtool_ops = &geneve_ethtool_ops;
1219 dev->destructor = free_netdev;
1220
1221 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1222
1223 dev->features |= NETIF_F_LLTX;
1224 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1225 dev->features |= NETIF_F_RXCSUM;
1226 dev->features |= NETIF_F_GSO_SOFTWARE;
1227
1228 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1229 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1230
1231 netif_keep_dst(dev);
1232 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1233 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1234 eth_hw_addr_random(dev);
1235 }
1236
1237 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1238 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1239 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1240 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1241 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1242 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1243 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1244 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1245 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1246 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1247 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1248 };
1249
1250 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1251 {
1252 if (tb[IFLA_ADDRESS]) {
1253 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1254 return -EINVAL;
1255
1256 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1257 return -EADDRNOTAVAIL;
1258 }
1259
1260 if (!data)
1261 return -EINVAL;
1262
1263 if (data[IFLA_GENEVE_ID]) {
1264 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1265
1266 if (vni >= GENEVE_VID_MASK)
1267 return -ERANGE;
1268 }
1269
1270 return 0;
1271 }
1272
1273 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1274 __be16 dst_port,
1275 union geneve_addr *remote,
1276 u8 vni[],
1277 bool *tun_on_same_port,
1278 bool *tun_collect_md)
1279 {
1280 struct geneve_dev *geneve, *t;
1281
1282 *tun_on_same_port = false;
1283 *tun_collect_md = false;
1284 t = NULL;
1285 list_for_each_entry(geneve, &gn->geneve_list, next) {
1286 if (geneve->dst_port == dst_port) {
1287 *tun_collect_md = geneve->collect_md;
1288 *tun_on_same_port = true;
1289 }
1290 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1291 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1292 dst_port == geneve->dst_port)
1293 t = geneve;
1294 }
1295 return t;
1296 }
1297
1298 static int geneve_configure(struct net *net, struct net_device *dev,
1299 union geneve_addr *remote,
1300 __u32 vni, __u8 ttl, __u8 tos, __be16 dst_port,
1301 bool metadata, u32 flags)
1302 {
1303 struct geneve_net *gn = net_generic(net, geneve_net_id);
1304 struct geneve_dev *t, *geneve = netdev_priv(dev);
1305 bool tun_collect_md, tun_on_same_port;
1306 int err, encap_len;
1307
1308 if (!remote)
1309 return -EINVAL;
1310 if (metadata &&
1311 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl))
1312 return -EINVAL;
1313
1314 geneve->net = net;
1315 geneve->dev = dev;
1316
1317 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1318 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1319 geneve->vni[2] = vni & 0x000000ff;
1320
1321 if ((remote->sa.sa_family == AF_INET &&
1322 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1323 (remote->sa.sa_family == AF_INET6 &&
1324 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1325 return -EINVAL;
1326 geneve->remote = *remote;
1327
1328 geneve->ttl = ttl;
1329 geneve->tos = tos;
1330 geneve->dst_port = dst_port;
1331 geneve->collect_md = metadata;
1332 geneve->flags = flags;
1333
1334 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1335 &tun_on_same_port, &tun_collect_md);
1336 if (t)
1337 return -EBUSY;
1338
1339 /* make enough headroom for basic scenario */
1340 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1341 if (remote->sa.sa_family == AF_INET)
1342 encap_len += sizeof(struct iphdr);
1343 else
1344 encap_len += sizeof(struct ipv6hdr);
1345 dev->needed_headroom = encap_len + ETH_HLEN;
1346
1347 if (metadata) {
1348 if (tun_on_same_port)
1349 return -EPERM;
1350 } else {
1351 if (tun_collect_md)
1352 return -EPERM;
1353 }
1354
1355 dst_cache_reset(&geneve->dst_cache);
1356
1357 err = register_netdevice(dev);
1358 if (err)
1359 return err;
1360
1361 list_add(&geneve->next, &gn->geneve_list);
1362 return 0;
1363 }
1364
1365 static int geneve_newlink(struct net *net, struct net_device *dev,
1366 struct nlattr *tb[], struct nlattr *data[])
1367 {
1368 __be16 dst_port = htons(GENEVE_UDP_PORT);
1369 __u8 ttl = 0, tos = 0;
1370 bool metadata = false;
1371 union geneve_addr remote = geneve_remote_unspec;
1372 __u32 vni = 0;
1373 u32 flags = 0;
1374
1375 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1376 return -EINVAL;
1377
1378 if (data[IFLA_GENEVE_REMOTE]) {
1379 remote.sa.sa_family = AF_INET;
1380 remote.sin.sin_addr.s_addr =
1381 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1382 }
1383
1384 if (data[IFLA_GENEVE_REMOTE6]) {
1385 if (!IS_ENABLED(CONFIG_IPV6))
1386 return -EPFNOSUPPORT;
1387
1388 remote.sa.sa_family = AF_INET6;
1389 remote.sin6.sin6_addr =
1390 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1391
1392 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1393 IPV6_ADDR_LINKLOCAL) {
1394 netdev_dbg(dev, "link-local remote is unsupported\n");
1395 return -EINVAL;
1396 }
1397 }
1398
1399 if (data[IFLA_GENEVE_ID])
1400 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1401
1402 if (data[IFLA_GENEVE_TTL])
1403 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1404
1405 if (data[IFLA_GENEVE_TOS])
1406 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1407
1408 if (data[IFLA_GENEVE_PORT])
1409 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1410
1411 if (data[IFLA_GENEVE_COLLECT_METADATA])
1412 metadata = true;
1413
1414 if (data[IFLA_GENEVE_UDP_CSUM] &&
1415 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1416 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1417
1418 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1419 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1420 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1421
1422 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1423 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1424 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1425
1426 return geneve_configure(net, dev, &remote, vni, ttl, tos, dst_port,
1427 metadata, flags);
1428 }
1429
1430 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1431 {
1432 struct geneve_dev *geneve = netdev_priv(dev);
1433
1434 list_del(&geneve->next);
1435 unregister_netdevice_queue(dev, head);
1436 }
1437
1438 static size_t geneve_get_size(const struct net_device *dev)
1439 {
1440 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1441 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1442 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1443 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1444 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1445 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1446 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1447 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1448 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1449 0;
1450 }
1451
1452 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1453 {
1454 struct geneve_dev *geneve = netdev_priv(dev);
1455 __u32 vni;
1456
1457 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1458 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1459 goto nla_put_failure;
1460
1461 if (geneve->remote.sa.sa_family == AF_INET) {
1462 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1463 geneve->remote.sin.sin_addr.s_addr))
1464 goto nla_put_failure;
1465 #if IS_ENABLED(CONFIG_IPV6)
1466 } else {
1467 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1468 &geneve->remote.sin6.sin6_addr))
1469 goto nla_put_failure;
1470 #endif
1471 }
1472
1473 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1474 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
1475 goto nla_put_failure;
1476
1477 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1478 goto nla_put_failure;
1479
1480 if (geneve->collect_md) {
1481 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1482 goto nla_put_failure;
1483 }
1484
1485 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1486 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1487 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1488 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1489 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1490 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1491 goto nla_put_failure;
1492
1493 return 0;
1494
1495 nla_put_failure:
1496 return -EMSGSIZE;
1497 }
1498
1499 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1500 .kind = "geneve",
1501 .maxtype = IFLA_GENEVE_MAX,
1502 .policy = geneve_policy,
1503 .priv_size = sizeof(struct geneve_dev),
1504 .setup = geneve_setup,
1505 .validate = geneve_validate,
1506 .newlink = geneve_newlink,
1507 .dellink = geneve_dellink,
1508 .get_size = geneve_get_size,
1509 .fill_info = geneve_fill_info,
1510 };
1511
1512 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1513 u8 name_assign_type, u16 dst_port)
1514 {
1515 struct nlattr *tb[IFLA_MAX + 1];
1516 struct net_device *dev;
1517 int err;
1518
1519 memset(tb, 0, sizeof(tb));
1520 dev = rtnl_create_link(net, name, name_assign_type,
1521 &geneve_link_ops, tb);
1522 if (IS_ERR(dev))
1523 return dev;
1524
1525 err = geneve_configure(net, dev, &geneve_remote_unspec,
1526 0, 0, 0, htons(dst_port), true,
1527 GENEVE_F_UDP_ZERO_CSUM6_RX);
1528 if (err)
1529 goto err;
1530
1531 /* openvswitch users expect packet sizes to be unrestricted,
1532 * so set the largest MTU we can.
1533 */
1534 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1535 if (err)
1536 goto err;
1537
1538 return dev;
1539
1540 err:
1541 free_netdev(dev);
1542 return ERR_PTR(err);
1543 }
1544 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1545
1546 static __net_init int geneve_init_net(struct net *net)
1547 {
1548 struct geneve_net *gn = net_generic(net, geneve_net_id);
1549
1550 INIT_LIST_HEAD(&gn->geneve_list);
1551 INIT_LIST_HEAD(&gn->sock_list);
1552 return 0;
1553 }
1554
1555 static void __net_exit geneve_exit_net(struct net *net)
1556 {
1557 struct geneve_net *gn = net_generic(net, geneve_net_id);
1558 struct geneve_dev *geneve, *next;
1559 struct net_device *dev, *aux;
1560 LIST_HEAD(list);
1561
1562 rtnl_lock();
1563
1564 /* gather any geneve devices that were moved into this ns */
1565 for_each_netdev_safe(net, dev, aux)
1566 if (dev->rtnl_link_ops == &geneve_link_ops)
1567 unregister_netdevice_queue(dev, &list);
1568
1569 /* now gather any other geneve devices that were created in this ns */
1570 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1571 /* If geneve->dev is in the same netns, it was already added
1572 * to the list by the previous loop.
1573 */
1574 if (!net_eq(dev_net(geneve->dev), net))
1575 unregister_netdevice_queue(geneve->dev, &list);
1576 }
1577
1578 /* unregister the devices gathered above */
1579 unregister_netdevice_many(&list);
1580 rtnl_unlock();
1581 }
1582
1583 static struct pernet_operations geneve_net_ops = {
1584 .init = geneve_init_net,
1585 .exit = geneve_exit_net,
1586 .id = &geneve_net_id,
1587 .size = sizeof(struct geneve_net),
1588 };
1589
1590 static int __init geneve_init_module(void)
1591 {
1592 int rc;
1593
1594 rc = register_pernet_subsys(&geneve_net_ops);
1595 if (rc)
1596 goto out1;
1597
1598 rc = rtnl_link_register(&geneve_link_ops);
1599 if (rc)
1600 goto out2;
1601
1602 return 0;
1603 out2:
1604 unregister_pernet_subsys(&geneve_net_ops);
1605 out1:
1606 return rc;
1607 }
1608 late_initcall(geneve_init_module);
1609
1610 static void __exit geneve_cleanup_module(void)
1611 {
1612 rtnl_link_unregister(&geneve_link_ops);
1613 unregister_pernet_subsys(&geneve_net_ops);
1614 }
1615 module_exit(geneve_cleanup_module);
1616
1617 MODULE_LICENSE("GPL");
1618 MODULE_VERSION(GENEVE_NETDEV_VER);
1619 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1620 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1621 MODULE_ALIAS_RTNL_LINK("geneve");
Linux kernel - Deliverables
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