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datapath: backport: geneve: fix max_mtu setting
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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 <linux/if_link.h>
19 #include <linux/if_vlan.h>
20
21 #include <net/addrconf.h>
22 #include <net/dst_cache.h>
23 #include <net/dst_metadata.h>
24 #include <net/net_namespace.h>
25 #include <net/netns/generic.h>
26 #include <net/rtnetlink.h>
27 #include <net/geneve.h>
28 #include <net/protocol.h>
29 #include <net/udp_tunnel.h>
30 #include <net/ip6_route.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ipv6.h>
33 #include <net/addrconf.h>
34 #include <net/ip6_tunnel.h>
35 #include <net/ip6_checksum.h>
36 #endif
37
38
39 #include "gso.h"
40 #include "vport-netdev.h"
41 #include "compat.h"
42
43 #ifndef USE_UPSTREAM_TUNNEL
44
45 #define GENEVE_NETDEV_VER "0.6"
46
47 #define GENEVE_UDP_PORT 6081
48
49 #define GENEVE_N_VID (1u << 24)
50 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
51
52 #define VNI_HASH_BITS 10
53 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
54
55 #define GENEVE_VER 0
56 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
57
58 /* per-network namespace private data for this module */
59 struct geneve_net {
60 struct list_head geneve_list;
61 struct list_head sock_list;
62 };
63
64 static int geneve_net_id;
65
66 union geneve_addr {
67 struct sockaddr_in sin;
68 struct sockaddr_in6 sin6;
69 struct sockaddr sa;
70 };
71
72 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
73
74 /* Pseudo network device */
75 struct geneve_dev {
76 struct hlist_node hlist; /* vni hash table */
77 struct net *net; /* netns for packet i/o */
78 struct net_device *dev; /* netdev for geneve tunnel */
79 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
80 #if IS_ENABLED(CONFIG_IPV6)
81 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
82 #endif
83 u8 vni[3]; /* virtual network ID for tunnel */
84 u8 ttl; /* TTL override */
85 u8 tos; /* TOS override */
86 union geneve_addr remote; /* IP address for link partner */
87 struct list_head next; /* geneve's per namespace list */
88 __be32 label; /* IPv6 flowlabel override */
89 __be16 dst_port;
90 bool collect_md;
91 u32 flags;
92 struct dst_cache dst_cache;
93 };
94
95 /* Geneve device flags */
96 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
97 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
98 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
99
100 struct geneve_sock {
101 bool collect_md;
102 struct list_head list;
103 struct socket *sock;
104 struct rcu_head rcu;
105 int refcnt;
106 struct hlist_head vni_list[VNI_HASH_SIZE];
107 u32 flags;
108 #ifdef HAVE_UDP_OFFLOAD
109 struct udp_offload udp_offloads;
110 #endif
111 };
112
113 static inline __u32 geneve_net_vni_hash(u8 vni[3])
114 {
115 __u32 vnid;
116
117 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
118 return hash_32(vnid, VNI_HASH_BITS);
119 }
120
121 static __be64 vni_to_tunnel_id(const __u8 *vni)
122 {
123 #ifdef __BIG_ENDIAN
124 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
125 #else
126 return (__force __be64)(((__force u64)vni[0] << 40) |
127 ((__force u64)vni[1] << 48) |
128 ((__force u64)vni[2] << 56));
129 #endif
130 }
131
132 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
133 {
134 return gs->sock->sk->sk_family;
135 }
136
137 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
138 __be32 addr, 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 addr == geneve->remote.sin.sin_addr.s_addr)
150 return geneve;
151 }
152 return NULL;
153 }
154
155 #if IS_ENABLED(CONFIG_IPV6)
156 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
157 struct in6_addr addr6, u8 vni[])
158 {
159 struct hlist_head *vni_list_head;
160 struct geneve_dev *geneve;
161 __u32 hash;
162
163 /* Find the device for this VNI */
164 hash = geneve_net_vni_hash(vni);
165 vni_list_head = &gs->vni_list[hash];
166 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
167 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
168 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
169 return geneve;
170 }
171 return NULL;
172 }
173 #endif
174
175 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
176 {
177 return (struct genevehdr *)(udp_hdr(skb) + 1);
178 }
179
180 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
181 struct sk_buff *skb)
182 {
183 u8 *vni;
184 __be32 addr;
185 static u8 zero_vni[3];
186 #if IS_ENABLED(CONFIG_IPV6)
187 static struct in6_addr zero_addr6;
188 #endif
189
190 if (geneve_get_sk_family(gs) == AF_INET) {
191 struct iphdr *iph;
192
193 iph = ip_hdr(skb); /* outer IP header... */
194
195 if (gs->collect_md) {
196 vni = zero_vni;
197 addr = 0;
198 } else {
199 vni = geneve_hdr(skb)->vni;
200 addr = iph->saddr;
201 }
202
203 return geneve_lookup(gs, addr, vni);
204 #if IS_ENABLED(CONFIG_IPV6)
205 } else if (geneve_get_sk_family(gs) == AF_INET6) {
206 struct ipv6hdr *ip6h;
207 struct in6_addr addr6;
208
209 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
210
211 if (gs->collect_md) {
212 vni = zero_vni;
213 addr6 = zero_addr6;
214 } else {
215 vni = geneve_hdr(skb)->vni;
216 addr6 = ip6h->saddr;
217 }
218
219 return geneve6_lookup(gs, addr6, vni);
220 #endif
221 }
222 return NULL;
223 }
224
225 /* geneve receive/decap routine */
226 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
227 struct sk_buff *skb)
228 {
229 struct genevehdr *gnvh = geneve_hdr(skb);
230 struct metadata_dst *tun_dst = NULL;
231 struct pcpu_sw_netstats *stats;
232 int err = 0;
233 void *oiph;
234 union {
235 struct metadata_dst dst;
236 char buf[sizeof(struct metadata_dst) + 256];
237 } buf;
238
239 if (ip_tunnel_collect_metadata() || gs->collect_md) {
240 __be16 flags;
241
242 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
243 (gnvh->oam ? TUNNEL_OAM : 0) |
244 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
245
246 tun_dst = &buf.dst;
247 ovs_udp_tun_rx_dst(tun_dst,
248 skb, geneve_get_sk_family(gs), flags,
249 vni_to_tunnel_id(gnvh->vni),
250 gnvh->opt_len * 4);
251 if (!tun_dst)
252 goto drop;
253 /* Update tunnel dst according to Geneve options. */
254 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
255 gnvh->options, gnvh->opt_len * 4);
256 } else {
257 /* Drop packets w/ critical options,
258 * since we don't support any...
259 */
260 if (gnvh->critical)
261 goto drop;
262 }
263
264 skb_reset_mac_header(skb);
265 skb->protocol = eth_type_trans(skb, geneve->dev);
266 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
267
268 if (tun_dst)
269 ovs_skb_dst_set(skb, &tun_dst->dst);
270
271 /* Ignore packet loops (and multicast echo) */
272 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
273 goto drop;
274
275 oiph = skb_network_header(skb);
276 skb_reset_network_header(skb);
277
278 if (geneve_get_sk_family(gs) == AF_INET)
279 err = IP_ECN_decapsulate(oiph, skb);
280 #if IS_ENABLED(CONFIG_IPV6)
281 else
282 err = IP6_ECN_decapsulate(oiph, skb);
283 #endif
284 if (unlikely(err > 1)) {
285 ++geneve->dev->stats.rx_frame_errors;
286 ++geneve->dev->stats.rx_errors;
287 goto drop;
288 }
289
290 stats = this_cpu_ptr(geneve->dev->tstats);
291 u64_stats_update_begin(&stats->syncp);
292 stats->rx_packets++;
293 stats->rx_bytes += skb->len;
294 u64_stats_update_end(&stats->syncp);
295
296 netdev_port_receive(skb, skb_tunnel_info(skb));
297 return;
298 drop:
299 /* Consume bad packet */
300 kfree_skb(skb);
301 }
302
303 /* Setup stats when device is created */
304 static int geneve_init(struct net_device *dev)
305 {
306 struct geneve_dev *geneve = netdev_priv(dev);
307 int err;
308
309 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
310 if (!dev->tstats)
311 return -ENOMEM;
312
313 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
314 if (err) {
315 free_percpu(dev->tstats);
316 return err;
317 }
318
319 return 0;
320 }
321
322 static void geneve_uninit(struct net_device *dev)
323 {
324 struct geneve_dev *geneve = netdev_priv(dev);
325
326 dst_cache_destroy(&geneve->dst_cache);
327 free_percpu(dev->tstats);
328 }
329
330 /* Callback from net/ipv4/udp.c to receive packets */
331 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
332 {
333 struct genevehdr *geneveh;
334 struct geneve_dev *geneve;
335 struct geneve_sock *gs;
336 int opts_len;
337
338 /* Need Geneve and inner Ethernet header to be present */
339 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
340 goto drop;
341
342 /* Return packets with reserved bits set */
343 geneveh = geneve_hdr(skb);
344 if (unlikely(geneveh->ver != GENEVE_VER))
345 goto drop;
346
347 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
348 goto drop;
349
350 gs = rcu_dereference_sk_user_data(sk);
351 if (!gs)
352 goto drop;
353
354 #if IS_ENABLED(CONFIG_IPV6)
355 #ifdef OVS_CHECK_UDP_TUNNEL_ZERO_CSUM
356 if (geneve_get_sk_family(gs) == AF_INET6 &&
357 !udp_hdr(skb)->check &&
358 !(gs->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)) {
359 udp6_csum_zero_error(skb);
360 goto drop;
361 }
362 #endif
363 #endif
364 geneve = geneve_lookup_skb(gs, skb);
365 if (!geneve)
366 goto drop;
367
368 opts_len = geneveh->opt_len * 4;
369 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
370 htons(ETH_P_TEB),
371 !net_eq(geneve->net, dev_net(geneve->dev))))
372 goto drop;
373
374 geneve_rx(geneve, gs, skb);
375 return 0;
376
377 drop:
378 /* Consume bad packet */
379 kfree_skb(skb);
380 return 0;
381 }
382
383 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
384 __be16 port, u32 flags)
385 {
386 struct socket *sock;
387 struct udp_port_cfg udp_conf;
388 int err;
389
390 memset(&udp_conf, 0, sizeof(udp_conf));
391
392 if (ipv6) {
393 udp_conf.family = AF_INET6;
394 udp_conf.ipv6_v6only = 1;
395 udp_conf.use_udp6_rx_checksums =
396 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
397 } else {
398 udp_conf.family = AF_INET;
399 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
400 }
401
402 udp_conf.local_udp_port = port;
403
404 /* Open UDP socket */
405 err = udp_sock_create(net, &udp_conf, &sock);
406 if (err < 0)
407 return ERR_PTR(err);
408
409 return sock;
410 }
411
412 static void geneve_notify_add_rx_port(struct geneve_sock *gs)
413 {
414 #ifdef HAVE_NDO_ADD_GENEVE_PORT
415 struct net_device *dev;
416 struct sock *sk = gs->sock->sk;
417 struct net *net = sock_net(sk);
418 sa_family_t sa_family = geneve_get_sk_family(gs);
419 __be16 port = inet_sk(sk)->inet_sport;
420
421 rcu_read_lock();
422 for_each_netdev_rcu(net, dev) {
423 if (dev->netdev_ops->ndo_add_geneve_port)
424 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
425 port);
426 }
427 rcu_read_unlock();
428 #else
429 #ifdef HAVE_UDP_OFFLOAD
430 struct sock *sk = gs->sock->sk;
431 sa_family_t sa_family = sk->sk_family;
432 int err;
433
434 if (sa_family == AF_INET) {
435 err = udp_add_offload(&gs->udp_offloads);
436 if (err)
437 pr_warn("geneve: udp_add_offload failed with status %d\n",
438 err);
439 }
440 #endif
441 #endif
442
443 }
444
445 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
446 {
447 #ifdef HAVE_NDO_ADD_GENEVE_PORT
448 struct net_device *dev;
449 struct sock *sk = gs->sock->sk;
450 struct net *net = sock_net(sk);
451 sa_family_t sa_family = geneve_get_sk_family(gs);
452 __be16 port = inet_sk(sk)->inet_sport;
453
454 rcu_read_lock();
455 for_each_netdev_rcu(net, dev) {
456 if (dev->netdev_ops->ndo_del_geneve_port)
457 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
458 port);
459 }
460
461 rcu_read_unlock();
462 #else
463 #ifdef HAVE_UDP_OFFLOAD
464 struct sock *sk = gs->sock->sk;
465 sa_family_t sa_family = sk->sk_family;
466
467 if (sa_family == AF_INET)
468 udp_del_offload(&gs->udp_offloads);
469 #endif
470
471 #endif
472 }
473
474 #if defined(HAVE_UDP_OFFLOAD) || \
475 defined(HAVE_UDP_TUNNEL_SOCK_CFG_GRO_RECEIVE)
476
477 static int geneve_hlen(struct genevehdr *gh)
478 {
479 return sizeof(*gh) + gh->opt_len * 4;
480 }
481
482 #ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
483 static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
484 struct sk_buff *skb)
485 #else
486 static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
487 struct sk_buff *skb,
488 struct udp_offload *uoff)
489 #endif
490 {
491 struct sk_buff *p, **pp = NULL;
492 struct genevehdr *gh, *gh2;
493 unsigned int hlen, gh_len, off_gnv;
494 const struct packet_offload *ptype;
495 __be16 type;
496 int flush = 1;
497
498 off_gnv = skb_gro_offset(skb);
499 hlen = off_gnv + sizeof(*gh);
500 gh = skb_gro_header_fast(skb, off_gnv);
501 if (skb_gro_header_hard(skb, hlen)) {
502 gh = skb_gro_header_slow(skb, hlen, off_gnv);
503 if (unlikely(!gh))
504 goto out;
505 }
506
507 if (gh->ver != GENEVE_VER || gh->oam)
508 goto out;
509 gh_len = geneve_hlen(gh);
510
511 hlen = off_gnv + gh_len;
512 if (skb_gro_header_hard(skb, hlen)) {
513 gh = skb_gro_header_slow(skb, hlen, off_gnv);
514 if (unlikely(!gh))
515 goto out;
516 }
517
518 for (p = *head; p; p = p->next) {
519 if (!NAPI_GRO_CB(p)->same_flow)
520 continue;
521
522 gh2 = (struct genevehdr *)(p->data + off_gnv);
523 if (gh->opt_len != gh2->opt_len ||
524 memcmp(gh, gh2, gh_len)) {
525 NAPI_GRO_CB(p)->same_flow = 0;
526 continue;
527 }
528 }
529
530 type = gh->proto_type;
531
532 rcu_read_lock();
533 ptype = gro_find_receive_by_type(type);
534 if (!ptype)
535 goto out_unlock;
536
537 skb_gro_pull(skb, gh_len);
538 skb_gro_postpull_rcsum(skb, gh, gh_len);
539 pp = ptype->callbacks.gro_receive(head, skb);
540 flush = 0;
541
542 out_unlock:
543 rcu_read_unlock();
544 out:
545 NAPI_GRO_CB(skb)->flush |= flush;
546
547 return pp;
548 }
549
550 #ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
551 static int geneve_gro_complete(struct sk_buff *skb, int nhoff)
552 #else
553 static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
554 struct udp_offload *uoff)
555 #endif
556 {
557 struct genevehdr *gh;
558 struct packet_offload *ptype;
559 __be16 type;
560 int gh_len;
561 int err = -ENOSYS;
562
563 udp_tunnel_gro_complete(skb, nhoff);
564
565 gh = (struct genevehdr *)(skb->data + nhoff);
566 gh_len = geneve_hlen(gh);
567 type = gh->proto_type;
568
569 rcu_read_lock();
570 ptype = gro_find_complete_by_type(type);
571 if (ptype)
572 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
573
574 rcu_read_unlock();
575
576 skb_set_inner_mac_header(skb, nhoff + gh_len);
577 return err;
578 }
579 #endif
580
581 /* Create new listen socket if needed */
582 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
583 bool ipv6, u32 flags)
584 {
585 struct geneve_net *gn = net_generic(net, geneve_net_id);
586 struct geneve_sock *gs;
587 struct socket *sock;
588 struct udp_tunnel_sock_cfg tunnel_cfg;
589 int h;
590
591 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
592 if (!gs)
593 return ERR_PTR(-ENOMEM);
594
595 sock = geneve_create_sock(net, ipv6, port, flags);
596 if (IS_ERR(sock)) {
597 kfree(gs);
598 return ERR_CAST(sock);
599 }
600
601 gs->sock = sock;
602 gs->refcnt = 1;
603 for (h = 0; h < VNI_HASH_SIZE; ++h)
604 INIT_HLIST_HEAD(&gs->vni_list[h]);
605
606 /* Initialize the geneve udp offloads structure */
607 #ifdef HAVE_UDP_OFFLOAD
608 gs->udp_offloads.port = port;
609 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
610 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
611 #endif
612
613 geneve_notify_add_rx_port(gs);
614 /* Mark socket as an encapsulation socket */
615 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
616 tunnel_cfg.sk_user_data = gs;
617 tunnel_cfg.encap_type = 1;
618 #ifdef HAVE_UDP_TUNNEL_SOCK_CFG_GRO_RECEIVE
619 tunnel_cfg.gro_receive = geneve_gro_receive;
620 tunnel_cfg.gro_complete = geneve_gro_complete;
621 #endif
622 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
623 tunnel_cfg.encap_destroy = NULL;
624 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
625 list_add(&gs->list, &gn->sock_list);
626 return gs;
627 }
628
629 static void __geneve_sock_release(struct geneve_sock *gs)
630 {
631 if (!gs || --gs->refcnt)
632 return;
633
634 list_del(&gs->list);
635 geneve_notify_del_rx_port(gs);
636 udp_tunnel_sock_release(gs->sock);
637 kfree_rcu(gs, rcu);
638 }
639
640 static void geneve_sock_release(struct geneve_dev *geneve)
641 {
642 __geneve_sock_release(geneve->sock4);
643 #if IS_ENABLED(CONFIG_IPV6)
644 __geneve_sock_release(geneve->sock6);
645 #endif
646 }
647
648 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
649 sa_family_t family,
650 __be16 dst_port)
651 {
652 struct geneve_sock *gs;
653
654 list_for_each_entry(gs, &gn->sock_list, list) {
655 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
656 geneve_get_sk_family(gs) == family) {
657 return gs;
658 }
659 }
660 return NULL;
661 }
662
663 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
664 {
665 struct net *net = geneve->net;
666 struct geneve_net *gn = net_generic(net, geneve_net_id);
667 struct geneve_sock *gs;
668 __u32 hash;
669
670 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
671 if (gs) {
672 gs->refcnt++;
673 goto out;
674 }
675
676 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
677 if (IS_ERR(gs))
678 return PTR_ERR(gs);
679
680 out:
681 gs->collect_md = geneve->collect_md;
682 gs->flags = geneve->flags;
683 #if IS_ENABLED(CONFIG_IPV6)
684 if (ipv6)
685 geneve->sock6 = gs;
686 else
687 #endif
688 geneve->sock4 = gs;
689
690 hash = geneve_net_vni_hash(geneve->vni);
691 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
692 return 0;
693 }
694
695 static int geneve_open(struct net_device *dev)
696 {
697 struct geneve_dev *geneve = netdev_priv(dev);
698 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
699 bool metadata = geneve->collect_md;
700 int ret = 0;
701
702 geneve->sock4 = NULL;
703 #if IS_ENABLED(CONFIG_IPV6)
704 geneve->sock6 = NULL;
705 if (ipv6 || metadata)
706 ret = geneve_sock_add(geneve, true);
707 #endif
708
709 if (!ret && (!ipv6 || metadata))
710 ret = geneve_sock_add(geneve, false);
711 if (ret < 0)
712 geneve_sock_release(geneve);
713
714 return ret;
715 }
716
717 static int geneve_stop(struct net_device *dev)
718 {
719 struct geneve_dev *geneve = netdev_priv(dev);
720
721 if (!hlist_unhashed(&geneve->hlist))
722 hlist_del_rcu(&geneve->hlist);
723 geneve_sock_release(geneve);
724 return 0;
725 }
726
727 static void geneve_build_header(struct genevehdr *geneveh,
728 __be16 tun_flags, u8 vni[3],
729 u8 options_len, u8 *options)
730 {
731 geneveh->ver = GENEVE_VER;
732 geneveh->opt_len = options_len / 4;
733 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
734 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
735 geneveh->rsvd1 = 0;
736 memcpy(geneveh->vni, vni, 3);
737 geneveh->proto_type = htons(ETH_P_TEB);
738 geneveh->rsvd2 = 0;
739
740 memcpy(geneveh->options, options, options_len);
741 }
742
743 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
744 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
745 u32 flags, bool xnet)
746 {
747 struct genevehdr *gnvh;
748 int min_headroom;
749 int err;
750 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
751
752 skb_scrub_packet(skb, xnet);
753
754 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
755 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
756 err = skb_cow_head(skb, min_headroom);
757 if (unlikely(err))
758 goto free_rt;
759
760 err = udp_tunnel_handle_offloads(skb, udp_sum);
761 if (err)
762 goto free_rt;
763
764 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
765 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
766
767 ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
768 return 0;
769
770 free_rt:
771 ip_rt_put(rt);
772 return err;
773 }
774
775 #if IS_ENABLED(CONFIG_IPV6)
776 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
777 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
778 u32 flags, bool xnet)
779 {
780 struct genevehdr *gnvh;
781 int min_headroom;
782 int err;
783 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
784
785 skb_scrub_packet(skb, xnet);
786
787 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
788 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
789 err = skb_cow_head(skb, min_headroom);
790 if (unlikely(err))
791 goto free_dst;
792
793 err = udp_tunnel_handle_offloads(skb, udp_sum);
794 if (err)
795 goto free_dst;
796
797 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
798 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
799
800 ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
801 return 0;
802
803 free_dst:
804 dst_release(dst);
805 return err;
806 }
807 #endif
808
809 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
810 struct net_device *dev,
811 struct flowi4 *fl4,
812 struct ip_tunnel_info *info)
813 {
814 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
815 struct geneve_dev *geneve = netdev_priv(dev);
816 struct dst_cache *dst_cache;
817 struct rtable *rt = NULL;
818 __u8 tos;
819
820 memset(fl4, 0, sizeof(*fl4));
821 fl4->flowi4_mark = skb->mark;
822 fl4->flowi4_proto = IPPROTO_UDP;
823
824 if (info) {
825 fl4->daddr = info->key.u.ipv4.dst;
826 fl4->saddr = info->key.u.ipv4.src;
827 fl4->flowi4_tos = RT_TOS(info->key.tos);
828 dst_cache = &info->dst_cache;
829 } else {
830 tos = geneve->tos;
831 if (tos == 1) {
832 const struct iphdr *iip = ip_hdr(skb);
833
834 tos = ip_tunnel_get_dsfield(iip, skb);
835 use_cache = false;
836 }
837
838 fl4->flowi4_tos = RT_TOS(tos);
839 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
840 dst_cache = &geneve->dst_cache;
841 }
842
843 if (use_cache) {
844 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
845 if (rt)
846 return rt;
847 }
848
849 rt = ip_route_output_key(geneve->net, fl4);
850 if (IS_ERR(rt)) {
851 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
852 return ERR_PTR(-ENETUNREACH);
853 }
854 if (rt->dst.dev == dev) { /* is this necessary? */
855 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
856 ip_rt_put(rt);
857 return ERR_PTR(-ELOOP);
858 }
859 if (use_cache)
860 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
861 return rt;
862 }
863
864 #if IS_ENABLED(CONFIG_IPV6)
865 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
866 struct net_device *dev,
867 struct flowi6 *fl6,
868 struct ip_tunnel_info *info)
869 {
870 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
871 struct geneve_dev *geneve = netdev_priv(dev);
872 struct geneve_sock *gs6 = geneve->sock6;
873 struct dst_entry *dst = NULL;
874 struct dst_cache *dst_cache;
875 __u8 prio;
876
877 memset(fl6, 0, sizeof(*fl6));
878 fl6->flowi6_mark = skb->mark;
879 fl6->flowi6_proto = IPPROTO_UDP;
880
881 if (info) {
882 fl6->daddr = info->key.u.ipv6.dst;
883 fl6->saddr = info->key.u.ipv6.src;
884 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
885 info->key.label);
886 dst_cache = &info->dst_cache;
887 } else {
888 prio = geneve->tos;
889 if (prio == 1) {
890 const struct iphdr *iip = ip_hdr(skb);
891
892 prio = ip_tunnel_get_dsfield(iip, skb);
893 use_cache = false;
894 }
895
896 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
897 geneve->label);
898 fl6->daddr = geneve->remote.sin6.sin6_addr;
899 dst_cache = &geneve->dst_cache;
900 }
901
902 if (use_cache) {
903 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
904 if (dst)
905 return dst;
906 }
907
908 #ifdef HAVE_IPV6_DST_LOOKUP_NET
909 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
910 #else
911 #ifdef HAVE_IPV6_STUB
912 if (ipv6_stub->ipv6_dst_lookup(gs6->sock->sk, &dst, fl6)) {
913 #else
914 if (ip6_dst_lookup(gs6->sock->sk, &dst, fl6)) {
915 #endif
916 #endif
917 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
918 return ERR_PTR(-ENETUNREACH);
919 }
920 if (dst->dev == dev) { /* is this necessary? */
921 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
922 dst_release(dst);
923 return ERR_PTR(-ELOOP);
924 }
925
926 if (use_cache)
927 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
928 return dst;
929 }
930 #endif
931
932 /* Convert 64 bit tunnel ID to 24 bit VNI. */
933 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
934 {
935 #ifdef __BIG_ENDIAN
936 vni[0] = (__force __u8)(tun_id >> 16);
937 vni[1] = (__force __u8)(tun_id >> 8);
938 vni[2] = (__force __u8)tun_id;
939 #else
940 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
941 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
942 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
943 #endif
944 }
945
946 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
947 struct ip_tunnel_info *info)
948 {
949 struct geneve_dev *geneve = netdev_priv(dev);
950 struct geneve_sock *gs4 = geneve->sock4;
951 struct rtable *rt = NULL;
952 const struct iphdr *iip; /* interior IP header */
953 int err = -EINVAL;
954 struct flowi4 fl4;
955 __u8 tos, ttl;
956 __be16 sport;
957 __be16 df;
958 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
959 u32 flags = geneve->flags;
960
961 if (geneve->collect_md) {
962 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
963 netdev_dbg(dev, "no tunnel metadata\n");
964 goto tx_error;
965 }
966 if (info && ip_tunnel_info_af(info) != AF_INET)
967 goto tx_error;
968 }
969
970 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
971 if (IS_ERR(rt)) {
972 err = PTR_ERR(rt);
973 goto tx_error;
974 }
975
976 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
977 skb_reset_mac_header(skb);
978
979 iip = ip_hdr(skb);
980
981 if (info) {
982 const struct ip_tunnel_key *key = &info->key;
983 u8 *opts = NULL;
984 u8 vni[3];
985
986 tunnel_id_to_vni(key->tun_id, vni);
987 if (info->options_len)
988 opts = ip_tunnel_info_opts(info);
989
990 if (key->tun_flags & TUNNEL_CSUM)
991 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
992 else
993 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
994
995 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
996 info->options_len, opts, flags, xnet);
997 if (unlikely(err))
998 goto tx_error;
999
1000 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
1001 ttl = key->ttl;
1002 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
1003 } else {
1004 err = geneve_build_skb(rt, skb, 0, geneve->vni,
1005 0, NULL, flags, xnet);
1006 if (unlikely(err))
1007 goto tx_error;
1008
1009 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
1010 ttl = geneve->ttl;
1011 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
1012 ttl = 1;
1013 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1014 df = 0;
1015 }
1016 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
1017 tos, ttl, df, sport, geneve->dst_port,
1018 !net_eq(geneve->net, dev_net(geneve->dev)),
1019 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
1020
1021 return NETDEV_TX_OK;
1022
1023 tx_error:
1024 dev_kfree_skb(skb);
1025
1026 if (err == -ELOOP)
1027 dev->stats.collisions++;
1028 else if (err == -ENETUNREACH)
1029 dev->stats.tx_carrier_errors++;
1030
1031 dev->stats.tx_errors++;
1032 return NETDEV_TX_OK;
1033 }
1034
1035 #if IS_ENABLED(CONFIG_IPV6)
1036 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
1037 struct ip_tunnel_info *info)
1038 {
1039 struct geneve_dev *geneve = netdev_priv(dev);
1040 struct geneve_sock *gs6 = geneve->sock6;
1041 struct dst_entry *dst = NULL;
1042 const struct iphdr *iip; /* interior IP header */
1043 int err = -EINVAL;
1044 struct flowi6 fl6;
1045 __u8 prio, ttl;
1046 __be16 sport;
1047 __be32 label;
1048 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1049 u32 flags = geneve->flags;
1050
1051 if (geneve->collect_md) {
1052 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1053 netdev_dbg(dev, "no tunnel metadata\n");
1054 goto tx_error;
1055 }
1056 }
1057
1058 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1059 if (IS_ERR(dst)) {
1060 err = PTR_ERR(dst);
1061 goto tx_error;
1062 }
1063
1064 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1065 skb_reset_mac_header(skb);
1066
1067 iip = ip_hdr(skb);
1068
1069 if (info) {
1070 const struct ip_tunnel_key *key = &info->key;
1071 u8 *opts = NULL;
1072 u8 vni[3];
1073
1074 tunnel_id_to_vni(key->tun_id, vni);
1075 if (info->options_len)
1076 opts = ip_tunnel_info_opts(info);
1077
1078 if (key->tun_flags & TUNNEL_CSUM)
1079 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1080 else
1081 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1082
1083 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1084 info->options_len, opts,
1085 flags, xnet);
1086 if (unlikely(err))
1087 goto tx_error;
1088
1089 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1090 ttl = key->ttl;
1091 label = info->key.label;
1092 } else {
1093 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1094 0, NULL, flags, xnet);
1095 if (unlikely(err))
1096 goto tx_error;
1097
1098 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1099 iip, skb);
1100 ttl = geneve->ttl;
1101 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1102 ttl = 1;
1103 ttl = ttl ? : ip6_dst_hoplimit(dst);
1104 label = geneve->label;
1105 }
1106 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1107 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1108 sport, geneve->dst_port,
1109 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1110 return NETDEV_TX_OK;
1111
1112 tx_error:
1113 dev_kfree_skb(skb);
1114
1115 if (err == -ELOOP)
1116 dev->stats.collisions++;
1117 else if (err == -ENETUNREACH)
1118 dev->stats.tx_carrier_errors++;
1119
1120 dev->stats.tx_errors++;
1121 return NETDEV_TX_OK;
1122 }
1123 #endif
1124
1125 netdev_tx_t rpl_geneve_xmit(struct sk_buff *skb)
1126 {
1127 struct net_device *dev = skb->dev;
1128 struct geneve_dev *geneve = netdev_priv(dev);
1129 struct ip_tunnel_info *info = NULL;
1130
1131 if (geneve->collect_md)
1132 info = skb_tunnel_info(skb);
1133
1134 #if IS_ENABLED(CONFIG_IPV6)
1135 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1136 (!info && geneve->remote.sa.sa_family == AF_INET6))
1137 return geneve6_xmit_skb(skb, dev, info);
1138 #endif
1139 return geneve_xmit_skb(skb, dev, info);
1140 }
1141 EXPORT_SYMBOL_GPL(rpl_geneve_xmit);
1142
1143 static netdev_tx_t geneve_dev_xmit(struct sk_buff *skb, struct net_device *dev)
1144 {
1145 /* Drop All packets coming from networking stack. OVS-CB is
1146 * not initialized for these packets.
1147 */
1148
1149 dev_kfree_skb(skb);
1150 dev->stats.tx_dropped++;
1151 return NETDEV_TX_OK;
1152 }
1153
1154 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1155 {
1156 struct geneve_dev *geneve = netdev_priv(dev);
1157 /* The max_mtu calculation does not take account of GENEVE
1158 * options, to avoid excluding potentially valid
1159 * configurations.
1160 */
1161 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1162
1163 if (geneve->remote.sa.sa_family == AF_INET6)
1164 max_mtu -= sizeof(struct ipv6hdr);
1165 else
1166 max_mtu -= sizeof(struct iphdr);
1167
1168 if (new_mtu < 68)
1169 return -EINVAL;
1170
1171 if (new_mtu > max_mtu) {
1172 if (strict)
1173 return -EINVAL;
1174
1175 new_mtu = max_mtu;
1176 }
1177
1178 dev->mtu = new_mtu;
1179 return 0;
1180 }
1181
1182 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1183 {
1184 return __geneve_change_mtu(dev, new_mtu, true);
1185 }
1186
1187 int ovs_geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1188 {
1189 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1190 struct geneve_dev *geneve = netdev_priv(dev);
1191 struct rtable *rt;
1192 struct flowi4 fl4;
1193 #if IS_ENABLED(CONFIG_IPV6)
1194 struct dst_entry *dst;
1195 struct flowi6 fl6;
1196 #endif
1197
1198 if (ip_tunnel_info_af(info) == AF_INET) {
1199 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1200 if (IS_ERR(rt))
1201 return PTR_ERR(rt);
1202
1203 ip_rt_put(rt);
1204 info->key.u.ipv4.src = fl4.saddr;
1205 #if IS_ENABLED(CONFIG_IPV6)
1206 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1207 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1208 if (IS_ERR(dst))
1209 return PTR_ERR(dst);
1210
1211 dst_release(dst);
1212 info->key.u.ipv6.src = fl6.saddr;
1213 #endif
1214 } else {
1215 return -EINVAL;
1216 }
1217
1218 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1219 1, USHRT_MAX, true);
1220 info->key.tp_dst = geneve->dst_port;
1221 return 0;
1222 }
1223 EXPORT_SYMBOL_GPL(ovs_geneve_fill_metadata_dst);
1224
1225 static const struct net_device_ops geneve_netdev_ops = {
1226 .ndo_init = geneve_init,
1227 .ndo_uninit = geneve_uninit,
1228 .ndo_open = geneve_open,
1229 .ndo_stop = geneve_stop,
1230 .ndo_start_xmit = geneve_dev_xmit,
1231 .ndo_get_stats64 = ip_tunnel_get_stats64,
1232 .ndo_change_mtu = geneve_change_mtu,
1233 .ndo_validate_addr = eth_validate_addr,
1234 .ndo_set_mac_address = eth_mac_addr,
1235 #ifdef HAVE_NDO_FILL_METADATA_DST
1236 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1237 #endif
1238 };
1239
1240 static void geneve_get_drvinfo(struct net_device *dev,
1241 struct ethtool_drvinfo *drvinfo)
1242 {
1243 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1244 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1245 }
1246
1247 static const struct ethtool_ops geneve_ethtool_ops = {
1248 .get_drvinfo = geneve_get_drvinfo,
1249 .get_link = ethtool_op_get_link,
1250 };
1251
1252 /* Info for udev, that this is a virtual tunnel endpoint */
1253 static struct device_type geneve_type = {
1254 .name = "geneve",
1255 };
1256
1257 /* Calls the ndo_add_geneve_port of the caller in order to
1258 * supply the listening GENEVE udp ports. Callers are expected
1259 * to implement the ndo_add_geneve_port.
1260 */
1261 static void geneve_push_rx_ports(struct net_device *dev)
1262 {
1263 #ifdef HAVE_NDO_ADD_GENEVE_PORT
1264 struct net *net = dev_net(dev);
1265 struct geneve_net *gn = net_generic(net, geneve_net_id);
1266 struct geneve_sock *gs;
1267 sa_family_t sa_family;
1268 struct sock *sk;
1269 __be16 port;
1270
1271 if (!dev->netdev_ops->ndo_add_geneve_port)
1272 return;
1273
1274 rcu_read_lock();
1275 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1276 sk = gs->sock->sk;
1277 sa_family = sk->sk_family;
1278 port = inet_sk(sk)->inet_sport;
1279 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1280 }
1281 rcu_read_unlock();
1282 #endif
1283 }
1284
1285 /* Initialize the device structure. */
1286 static void geneve_setup(struct net_device *dev)
1287 {
1288 ether_setup(dev);
1289
1290 dev->netdev_ops = &geneve_netdev_ops;
1291 dev->ethtool_ops = &geneve_ethtool_ops;
1292 dev->destructor = free_netdev;
1293
1294 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1295
1296 dev->features |= NETIF_F_LLTX;
1297 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1298 dev->features |= NETIF_F_RXCSUM;
1299 dev->features |= NETIF_F_GSO_SOFTWARE;
1300
1301 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1302 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1303
1304 #if 0
1305 netif_keep_dst(dev);
1306 #endif
1307 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1308 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1309 eth_hw_addr_random(dev);
1310 }
1311
1312 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1313 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1314 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1315 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1316 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1317 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1318 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1319 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1320 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1321 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1322 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1323 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1324 };
1325
1326 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1327 {
1328 if (tb[IFLA_ADDRESS]) {
1329 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1330 return -EINVAL;
1331
1332 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1333 return -EADDRNOTAVAIL;
1334 }
1335
1336 if (!data)
1337 return -EINVAL;
1338
1339 if (data[IFLA_GENEVE_ID]) {
1340 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1341
1342 if (vni >= GENEVE_VID_MASK)
1343 return -ERANGE;
1344 }
1345
1346 return 0;
1347 }
1348
1349 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1350 __be16 dst_port,
1351 union geneve_addr *remote,
1352 u8 vni[],
1353 bool *tun_on_same_port,
1354 bool *tun_collect_md)
1355 {
1356 struct geneve_dev *geneve, *t;
1357
1358 *tun_on_same_port = false;
1359 *tun_collect_md = false;
1360 t = NULL;
1361 list_for_each_entry(geneve, &gn->geneve_list, next) {
1362 if (geneve->dst_port == dst_port) {
1363 *tun_collect_md = geneve->collect_md;
1364 *tun_on_same_port = true;
1365 }
1366 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1367 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1368 dst_port == geneve->dst_port)
1369 t = geneve;
1370 }
1371 return t;
1372 }
1373
1374 static int geneve_configure(struct net *net, struct net_device *dev,
1375 union geneve_addr *remote,
1376 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1377 __be16 dst_port, bool metadata, u32 flags)
1378 {
1379 struct geneve_net *gn = net_generic(net, geneve_net_id);
1380 struct geneve_dev *t, *geneve = netdev_priv(dev);
1381 bool tun_collect_md, tun_on_same_port;
1382 int err, encap_len;
1383
1384 if (!remote)
1385 return -EINVAL;
1386 if (metadata &&
1387 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1388 return -EINVAL;
1389
1390 geneve->net = net;
1391 geneve->dev = dev;
1392
1393 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1394 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1395 geneve->vni[2] = vni & 0x000000ff;
1396
1397 if ((remote->sa.sa_family == AF_INET &&
1398 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1399 (remote->sa.sa_family == AF_INET6 &&
1400 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1401 return -EINVAL;
1402 if (label && remote->sa.sa_family != AF_INET6)
1403 return -EINVAL;
1404
1405 geneve->remote = *remote;
1406
1407 geneve->ttl = ttl;
1408 geneve->tos = tos;
1409 geneve->label = label;
1410 geneve->dst_port = dst_port;
1411 geneve->collect_md = metadata;
1412 geneve->flags = flags;
1413
1414 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1415 &tun_on_same_port, &tun_collect_md);
1416 if (t)
1417 return -EBUSY;
1418
1419 /* make enough headroom for basic scenario */
1420 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1421 if (remote->sa.sa_family == AF_INET)
1422 encap_len += sizeof(struct iphdr);
1423 else
1424 encap_len += sizeof(struct ipv6hdr);
1425 dev->needed_headroom = encap_len + ETH_HLEN;
1426
1427 if (metadata) {
1428 if (tun_on_same_port)
1429 return -EPERM;
1430 } else {
1431 if (tun_collect_md)
1432 return -EPERM;
1433 }
1434
1435 dst_cache_reset(&geneve->dst_cache);
1436
1437 err = register_netdevice(dev);
1438 if (err)
1439 return err;
1440
1441 list_add(&geneve->next, &gn->geneve_list);
1442 return 0;
1443 }
1444
1445 static int geneve_newlink(struct net *net, struct net_device *dev,
1446 struct nlattr *tb[], struct nlattr *data[])
1447 {
1448 __be16 dst_port = htons(GENEVE_UDP_PORT);
1449 __u8 ttl = 0, tos = 0;
1450 bool metadata = false;
1451 union geneve_addr remote = geneve_remote_unspec;
1452 __be32 label = 0;
1453 __u32 vni = 0;
1454 u32 flags = 0;
1455
1456 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1457 return -EINVAL;
1458
1459 if (data[IFLA_GENEVE_REMOTE]) {
1460 remote.sa.sa_family = AF_INET;
1461 remote.sin.sin_addr.s_addr =
1462 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1463 }
1464
1465 if (data[IFLA_GENEVE_REMOTE6]) {
1466 if (!IS_ENABLED(CONFIG_IPV6))
1467 return -EPFNOSUPPORT;
1468
1469 remote.sa.sa_family = AF_INET6;
1470 remote.sin6.sin6_addr =
1471 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1472
1473 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1474 IPV6_ADDR_LINKLOCAL) {
1475 netdev_dbg(dev, "link-local remote is unsupported\n");
1476 return -EINVAL;
1477 }
1478 }
1479
1480 if (data[IFLA_GENEVE_ID])
1481 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1482
1483 if (data[IFLA_GENEVE_TTL])
1484 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1485
1486 if (data[IFLA_GENEVE_TOS])
1487 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1488
1489 if (data[IFLA_GENEVE_LABEL])
1490 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1491 IPV6_FLOWLABEL_MASK;
1492
1493 if (data[IFLA_GENEVE_PORT])
1494 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1495
1496 if (data[IFLA_GENEVE_COLLECT_METADATA])
1497 metadata = true;
1498
1499 if (data[IFLA_GENEVE_UDP_CSUM] &&
1500 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1501 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1502
1503 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1504 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1505 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1506
1507 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1508 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1509 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1510
1511 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1512 dst_port, metadata, flags);
1513 }
1514
1515 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1516 {
1517 struct geneve_dev *geneve = netdev_priv(dev);
1518
1519 list_del(&geneve->next);
1520 unregister_netdevice_queue(dev, head);
1521 }
1522
1523 static size_t geneve_get_size(const struct net_device *dev)
1524 {
1525 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1526 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1527 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1528 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1529 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1530 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1531 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1532 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1533 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1534 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1535 0;
1536 }
1537
1538 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1539 {
1540 struct geneve_dev *geneve = netdev_priv(dev);
1541 __u32 vni;
1542
1543 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1544 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1545 goto nla_put_failure;
1546
1547 if (geneve->remote.sa.sa_family == AF_INET) {
1548 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1549 geneve->remote.sin.sin_addr.s_addr))
1550 goto nla_put_failure;
1551 #if IS_ENABLED(CONFIG_IPV6)
1552 } else {
1553 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1554 &geneve->remote.sin6.sin6_addr))
1555 goto nla_put_failure;
1556 #endif
1557 }
1558
1559 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1560 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1561 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1562 goto nla_put_failure;
1563
1564 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1565 goto nla_put_failure;
1566
1567 if (geneve->collect_md) {
1568 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1569 goto nla_put_failure;
1570 }
1571
1572 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1573 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1574 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1575 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1576 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1577 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1578 goto nla_put_failure;
1579
1580 return 0;
1581
1582 nla_put_failure:
1583 return -EMSGSIZE;
1584 }
1585
1586 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1587 .kind = "geneve",
1588 .maxtype = IFLA_GENEVE_MAX,
1589 .policy = geneve_policy,
1590 .priv_size = sizeof(struct geneve_dev),
1591 .setup = geneve_setup,
1592 .validate = geneve_validate,
1593 .newlink = geneve_newlink,
1594 .dellink = geneve_dellink,
1595 .get_size = geneve_get_size,
1596 .fill_info = geneve_fill_info,
1597 };
1598
1599 struct net_device *rpl_geneve_dev_create_fb(struct net *net, const char *name,
1600 u8 name_assign_type, u16 dst_port)
1601 {
1602 struct nlattr *tb[IFLA_MAX + 1];
1603 struct net_device *dev;
1604 LIST_HEAD(list_kill);
1605 int err;
1606
1607 memset(tb, 0, sizeof(tb));
1608 dev = rtnl_create_link(net, name, name_assign_type,
1609 &geneve_link_ops, tb);
1610 if (IS_ERR(dev))
1611 return dev;
1612
1613 err = geneve_configure(net, dev, &geneve_remote_unspec,
1614 0, 0, 0, 0, htons(dst_port), true,
1615 GENEVE_F_UDP_ZERO_CSUM6_RX);
1616 if (err) {
1617 free_netdev(dev);
1618 return ERR_PTR(err);
1619 }
1620
1621 /* openvswitch users expect packet sizes to be unrestricted,
1622 * so set the largest MTU we can.
1623 */
1624 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1625 if (err)
1626 goto err;
1627
1628 err = rtnl_configure_link(dev, NULL);
1629 if (err < 0)
1630 goto err;
1631
1632 return dev;
1633
1634 err:
1635 geneve_dellink(dev, &list_kill);
1636 unregister_netdevice_many(&list_kill);
1637 return ERR_PTR(err);
1638 }
1639 EXPORT_SYMBOL_GPL(rpl_geneve_dev_create_fb);
1640
1641 static int geneve_netdevice_event(struct notifier_block *unused,
1642 unsigned long event, void *ptr)
1643 {
1644 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1645
1646 if (event == NETDEV_OFFLOAD_PUSH_GENEVE)
1647 geneve_push_rx_ports(dev);
1648
1649 return NOTIFY_DONE;
1650 }
1651
1652 static struct notifier_block geneve_notifier_block __read_mostly = {
1653 .notifier_call = geneve_netdevice_event,
1654 };
1655
1656 static __net_init int geneve_init_net(struct net *net)
1657 {
1658 struct geneve_net *gn = net_generic(net, geneve_net_id);
1659
1660 INIT_LIST_HEAD(&gn->geneve_list);
1661 INIT_LIST_HEAD(&gn->sock_list);
1662 return 0;
1663 }
1664
1665 static void __net_exit geneve_exit_net(struct net *net)
1666 {
1667 struct geneve_net *gn = net_generic(net, geneve_net_id);
1668 struct geneve_dev *geneve, *next;
1669 struct net_device *dev, *aux;
1670 LIST_HEAD(list);
1671
1672 rtnl_lock();
1673
1674 /* gather any geneve devices that were moved into this ns */
1675 for_each_netdev_safe(net, dev, aux)
1676 if (dev->rtnl_link_ops == &geneve_link_ops)
1677 unregister_netdevice_queue(dev, &list);
1678
1679 /* now gather any other geneve devices that were created in this ns */
1680 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1681 /* If geneve->dev is in the same netns, it was already added
1682 * to the list by the previous loop.
1683 */
1684 if (!net_eq(dev_net(geneve->dev), net))
1685 unregister_netdevice_queue(geneve->dev, &list);
1686 }
1687
1688 /* unregister the devices gathered above */
1689 unregister_netdevice_many(&list);
1690 rtnl_unlock();
1691 }
1692
1693 static struct pernet_operations geneve_net_ops = {
1694 .init = geneve_init_net,
1695 .exit = geneve_exit_net,
1696 .id = &geneve_net_id,
1697 .size = sizeof(struct geneve_net),
1698 };
1699
1700 int rpl_geneve_init_module(void)
1701 {
1702 int rc;
1703
1704 rc = register_pernet_subsys(&geneve_net_ops);
1705 if (rc)
1706 goto out1;
1707
1708 rc = register_netdevice_notifier(&geneve_notifier_block);
1709 if (rc)
1710 goto out2;
1711
1712 rc = rtnl_link_register(&geneve_link_ops);
1713 if (rc)
1714 goto out3;
1715
1716 pr_info("Geneve tunneling driver\n");
1717 return 0;
1718
1719 out3:
1720 unregister_netdevice_notifier(&geneve_notifier_block);
1721 out2:
1722 unregister_pernet_subsys(&geneve_net_ops);
1723 out1:
1724 return rc;
1725 }
1726
1727 void rpl_geneve_cleanup_module(void)
1728 {
1729 rtnl_link_unregister(&geneve_link_ops);
1730 unregister_netdevice_notifier(&geneve_notifier_block);
1731 unregister_pernet_subsys(&geneve_net_ops);
1732 }
1733
1734 #endif
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