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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GENEVE: Generic Network Virtualization Encapsulation
4 *
5 * Copyright (c) 2015 Red Hat, Inc.
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/ethtool.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/etherdevice.h>
14#include <linux/hash.h>
15#include <net/ipv6_stubs.h>
16#include <net/dst_metadata.h>
17#include <net/gro_cells.h>
18#include <net/rtnetlink.h>
19#include <net/geneve.h>
20#include <net/gro.h>
21#include <net/protocol.h>
22
23#define GENEVE_NETDEV_VER "0.6"
24
25#define GENEVE_N_VID (1u << 24)
26#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
27
28#define VNI_HASH_BITS 10
29#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
30
31static bool log_ecn_error = true;
32module_param(log_ecn_error, bool, 0644);
33MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
34
35#define GENEVE_VER 0
36#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
37#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
38#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
39
40/* per-network namespace private data for this module */
41struct geneve_net {
42 struct list_head geneve_list;
43 struct list_head sock_list;
44};
45
46static unsigned int geneve_net_id;
47
48struct geneve_dev_node {
49 struct hlist_node hlist;
50 struct geneve_dev *geneve;
51};
52
53struct geneve_config {
54 struct ip_tunnel_info info;
55 bool collect_md;
56 bool use_udp6_rx_checksums;
57 bool ttl_inherit;
58 enum ifla_geneve_df df;
59 bool inner_proto_inherit;
60};
61
62/* Pseudo network device */
63struct geneve_dev {
64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
65#if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
67#endif
68 struct net *net; /* netns for packet i/o */
69 struct net_device *dev; /* netdev for geneve tunnel */
70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
71#if IS_ENABLED(CONFIG_IPV6)
72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
73#endif
74 struct list_head next; /* geneve's per namespace list */
75 struct gro_cells gro_cells;
76 struct geneve_config cfg;
77};
78
79struct geneve_sock {
80 bool collect_md;
81 struct list_head list;
82 struct socket *sock;
83 struct rcu_head rcu;
84 int refcnt;
85 struct hlist_head vni_list[VNI_HASH_SIZE];
86};
87
88static inline __u32 geneve_net_vni_hash(u8 vni[3])
89{
90 __u32 vnid;
91
92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
93 return hash_32(vnid, VNI_HASH_BITS);
94}
95
96static __be64 vni_to_tunnel_id(const __u8 *vni)
97{
98#ifdef __BIG_ENDIAN
99 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
100#else
101 return (__force __be64)(((__force u64)vni[0] << 40) |
102 ((__force u64)vni[1] << 48) |
103 ((__force u64)vni[2] << 56));
104#endif
105}
106
107/* Convert 64 bit tunnel ID to 24 bit VNI. */
108static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
109{
110#ifdef __BIG_ENDIAN
111 vni[0] = (__force __u8)(tun_id >> 16);
112 vni[1] = (__force __u8)(tun_id >> 8);
113 vni[2] = (__force __u8)tun_id;
114#else
115 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
116 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
117 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
118#endif
119}
120
121static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
122{
123 return !memcmp(vni, &tun_id[5], 3);
124}
125
126static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
127{
128 return gs->sock->sk->sk_family;
129}
130
131static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
132 __be32 addr, u8 vni[])
133{
134 struct hlist_head *vni_list_head;
135 struct geneve_dev_node *node;
136 __u32 hash;
137
138 /* Find the device for this VNI */
139 hash = geneve_net_vni_hash(vni);
140 vni_list_head = &gs->vni_list[hash];
141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
143 addr == node->geneve->cfg.info.key.u.ipv4.dst)
144 return node->geneve;
145 }
146 return NULL;
147}
148
149#if IS_ENABLED(CONFIG_IPV6)
150static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
151 struct in6_addr addr6, u8 vni[])
152{
153 struct hlist_head *vni_list_head;
154 struct geneve_dev_node *node;
155 __u32 hash;
156
157 /* Find the device for this VNI */
158 hash = geneve_net_vni_hash(vni);
159 vni_list_head = &gs->vni_list[hash];
160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
163 return node->geneve;
164 }
165 return NULL;
166}
167#endif
168
169static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
170{
171 return (struct genevehdr *)(udp_hdr(skb) + 1);
172}
173
174static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
175 struct sk_buff *skb)
176{
177 static u8 zero_vni[3];
178 u8 *vni;
179
180 if (geneve_get_sk_family(gs) == AF_INET) {
181 struct iphdr *iph;
182 __be32 addr;
183
184 iph = ip_hdr(skb); /* outer IP header... */
185
186 if (gs->collect_md) {
187 vni = zero_vni;
188 addr = 0;
189 } else {
190 vni = geneve_hdr(skb)->vni;
191 addr = iph->saddr;
192 }
193
194 return geneve_lookup(gs, addr, vni);
195#if IS_ENABLED(CONFIG_IPV6)
196 } else if (geneve_get_sk_family(gs) == AF_INET6) {
197 static struct in6_addr zero_addr6;
198 struct ipv6hdr *ip6h;
199 struct in6_addr addr6;
200
201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
202
203 if (gs->collect_md) {
204 vni = zero_vni;
205 addr6 = zero_addr6;
206 } else {
207 vni = geneve_hdr(skb)->vni;
208 addr6 = ip6h->saddr;
209 }
210
211 return geneve6_lookup(gs, addr6, vni);
212#endif
213 }
214 return NULL;
215}
216
217/* geneve receive/decap routine */
218static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
219 struct sk_buff *skb)
220{
221 struct genevehdr *gnvh = geneve_hdr(skb);
222 struct metadata_dst *tun_dst = NULL;
223 unsigned int len;
224 int err = 0;
225 void *oiph;
226
227 if (ip_tunnel_collect_metadata() || gs->collect_md) {
228 __be16 flags;
229
230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
232
233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
234 vni_to_tunnel_id(gnvh->vni),
235 gnvh->opt_len * 4);
236 if (!tun_dst) {
237 geneve->dev->stats.rx_dropped++;
238 goto drop;
239 }
240 /* Update tunnel dst according to Geneve options. */
241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
242 gnvh->options, gnvh->opt_len * 4,
243 TUNNEL_GENEVE_OPT);
244 } else {
245 /* Drop packets w/ critical options,
246 * since we don't support any...
247 */
248 if (gnvh->critical) {
249 geneve->dev->stats.rx_frame_errors++;
250 geneve->dev->stats.rx_errors++;
251 goto drop;
252 }
253 }
254
255 if (tun_dst)
256 skb_dst_set(skb, &tun_dst->dst);
257
258 if (gnvh->proto_type == htons(ETH_P_TEB)) {
259 skb_reset_mac_header(skb);
260 skb->protocol = eth_type_trans(skb, geneve->dev);
261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
262
263 /* Ignore packet loops (and multicast echo) */
264 if (ether_addr_equal(eth_hdr(skb)->h_source,
265 geneve->dev->dev_addr)) {
266 geneve->dev->stats.rx_errors++;
267 goto drop;
268 }
269 } else {
270 skb_reset_mac_header(skb);
271 skb->dev = geneve->dev;
272 skb->pkt_type = PACKET_HOST;
273 }
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
285 if (unlikely(err)) {
286 if (log_ecn_error) {
287 if (geneve_get_sk_family(gs) == AF_INET)
288 net_info_ratelimited("non-ECT from %pI4 "
289 "with TOS=%#x\n",
290 &((struct iphdr *)oiph)->saddr,
291 ((struct iphdr *)oiph)->tos);
292#if IS_ENABLED(CONFIG_IPV6)
293 else
294 net_info_ratelimited("non-ECT from %pI6\n",
295 &((struct ipv6hdr *)oiph)->saddr);
296#endif
297 }
298 if (err > 1) {
299 ++geneve->dev->stats.rx_frame_errors;
300 ++geneve->dev->stats.rx_errors;
301 goto drop;
302 }
303 }
304
305 len = skb->len;
306 err = gro_cells_receive(&geneve->gro_cells, skb);
307 if (likely(err == NET_RX_SUCCESS))
308 dev_sw_netstats_rx_add(geneve->dev, len);
309
310 return;
311drop:
312 /* Consume bad packet */
313 kfree_skb(skb);
314}
315
316/* Setup stats when device is created */
317static int geneve_init(struct net_device *dev)
318{
319 struct geneve_dev *geneve = netdev_priv(dev);
320 int err;
321
322 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
323 if (!dev->tstats)
324 return -ENOMEM;
325
326 err = gro_cells_init(&geneve->gro_cells, dev);
327 if (err) {
328 free_percpu(dev->tstats);
329 return err;
330 }
331
332 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
333 if (err) {
334 free_percpu(dev->tstats);
335 gro_cells_destroy(&geneve->gro_cells);
336 return err;
337 }
338 return 0;
339}
340
341static void geneve_uninit(struct net_device *dev)
342{
343 struct geneve_dev *geneve = netdev_priv(dev);
344
345 dst_cache_destroy(&geneve->cfg.info.dst_cache);
346 gro_cells_destroy(&geneve->gro_cells);
347 free_percpu(dev->tstats);
348}
349
350/* Callback from net/ipv4/udp.c to receive packets */
351static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
352{
353 struct genevehdr *geneveh;
354 struct geneve_dev *geneve;
355 struct geneve_sock *gs;
356 __be16 inner_proto;
357 int opts_len;
358
359 /* Need UDP and Geneve header to be present */
360 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
361 goto drop;
362
363 /* Return packets with reserved bits set */
364 geneveh = geneve_hdr(skb);
365 if (unlikely(geneveh->ver != GENEVE_VER))
366 goto drop;
367
368 inner_proto = geneveh->proto_type;
369
370 if (unlikely((inner_proto != htons(ETH_P_TEB) &&
371 inner_proto != htons(ETH_P_IP) &&
372 inner_proto != htons(ETH_P_IPV6))))
373 goto drop;
374
375 gs = rcu_dereference_sk_user_data(sk);
376 if (!gs)
377 goto drop;
378
379 geneve = geneve_lookup_skb(gs, skb);
380 if (!geneve)
381 goto drop;
382
383 if (unlikely((!geneve->cfg.inner_proto_inherit &&
384 inner_proto != htons(ETH_P_TEB)))) {
385 geneve->dev->stats.rx_dropped++;
386 goto drop;
387 }
388
389 opts_len = geneveh->opt_len * 4;
390 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
391 !net_eq(geneve->net, dev_net(geneve->dev)))) {
392 geneve->dev->stats.rx_dropped++;
393 goto drop;
394 }
395
396 geneve_rx(geneve, gs, skb);
397 return 0;
398
399drop:
400 /* Consume bad packet */
401 kfree_skb(skb);
402 return 0;
403}
404
405/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
406static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
407{
408 struct genevehdr *geneveh;
409 struct geneve_sock *gs;
410 u8 zero_vni[3] = { 0 };
411 u8 *vni = zero_vni;
412
413 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
414 return -EINVAL;
415
416 geneveh = geneve_hdr(skb);
417 if (geneveh->ver != GENEVE_VER)
418 return -EINVAL;
419
420 if (geneveh->proto_type != htons(ETH_P_TEB))
421 return -EINVAL;
422
423 gs = rcu_dereference_sk_user_data(sk);
424 if (!gs)
425 return -ENOENT;
426
427 if (geneve_get_sk_family(gs) == AF_INET) {
428 struct iphdr *iph = ip_hdr(skb);
429 __be32 addr4 = 0;
430
431 if (!gs->collect_md) {
432 vni = geneve_hdr(skb)->vni;
433 addr4 = iph->daddr;
434 }
435
436 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
437 }
438
439#if IS_ENABLED(CONFIG_IPV6)
440 if (geneve_get_sk_family(gs) == AF_INET6) {
441 struct ipv6hdr *ip6h = ipv6_hdr(skb);
442 struct in6_addr addr6;
443
444 memset(&addr6, 0, sizeof(struct in6_addr));
445
446 if (!gs->collect_md) {
447 vni = geneve_hdr(skb)->vni;
448 addr6 = ip6h->daddr;
449 }
450
451 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
452 }
453#endif
454
455 return -EPFNOSUPPORT;
456}
457
458static struct socket *geneve_create_sock(struct net *net, bool ipv6,
459 __be16 port, bool ipv6_rx_csum)
460{
461 struct socket *sock;
462 struct udp_port_cfg udp_conf;
463 int err;
464
465 memset(&udp_conf, 0, sizeof(udp_conf));
466
467 if (ipv6) {
468 udp_conf.family = AF_INET6;
469 udp_conf.ipv6_v6only = 1;
470 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
471 } else {
472 udp_conf.family = AF_INET;
473 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
474 }
475
476 udp_conf.local_udp_port = port;
477
478 /* Open UDP socket */
479 err = udp_sock_create(net, &udp_conf, &sock);
480 if (err < 0)
481 return ERR_PTR(err);
482
483 udp_allow_gso(sock->sk);
484 return sock;
485}
486
487static int geneve_hlen(struct genevehdr *gh)
488{
489 return sizeof(*gh) + gh->opt_len * 4;
490}
491
492static struct sk_buff *geneve_gro_receive(struct sock *sk,
493 struct list_head *head,
494 struct sk_buff *skb)
495{
496 struct sk_buff *pp = NULL;
497 struct sk_buff *p;
498 struct genevehdr *gh, *gh2;
499 unsigned int hlen, gh_len, off_gnv;
500 const struct packet_offload *ptype;
501 __be16 type;
502 int flush = 1;
503
504 off_gnv = skb_gro_offset(skb);
505 hlen = off_gnv + sizeof(*gh);
506 gh = skb_gro_header(skb, hlen, off_gnv);
507 if (unlikely(!gh))
508 goto out;
509
510 if (gh->ver != GENEVE_VER || gh->oam)
511 goto out;
512 gh_len = geneve_hlen(gh);
513
514 hlen = off_gnv + gh_len;
515 if (skb_gro_header_hard(skb, hlen)) {
516 gh = skb_gro_header_slow(skb, hlen, off_gnv);
517 if (unlikely(!gh))
518 goto out;
519 }
520
521 list_for_each_entry(p, head, list) {
522 if (!NAPI_GRO_CB(p)->same_flow)
523 continue;
524
525 gh2 = (struct genevehdr *)(p->data + off_gnv);
526 if (gh->opt_len != gh2->opt_len ||
527 memcmp(gh, gh2, gh_len)) {
528 NAPI_GRO_CB(p)->same_flow = 0;
529 continue;
530 }
531 }
532
533 skb_gro_pull(skb, gh_len);
534 skb_gro_postpull_rcsum(skb, gh, gh_len);
535 type = gh->proto_type;
536 if (likely(type == htons(ETH_P_TEB)))
537 return call_gro_receive(eth_gro_receive, head, skb);
538
539 ptype = gro_find_receive_by_type(type);
540 if (!ptype)
541 goto out;
542
543 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
544 flush = 0;
545
546out:
547 skb_gro_flush_final(skb, pp, flush);
548
549 return pp;
550}
551
552static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
553 int nhoff)
554{
555 struct genevehdr *gh;
556 struct packet_offload *ptype;
557 __be16 type;
558 int gh_len;
559 int err = -ENOSYS;
560
561 gh = (struct genevehdr *)(skb->data + nhoff);
562 gh_len = geneve_hlen(gh);
563 type = gh->proto_type;
564
565 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
566 if (likely(type == htons(ETH_P_TEB)))
567 return eth_gro_complete(skb, nhoff + gh_len);
568
569 ptype = gro_find_complete_by_type(type);
570 if (ptype)
571 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
572
573 skb_set_inner_mac_header(skb, nhoff + gh_len);
574
575 return err;
576}
577
578/* Create new listen socket if needed */
579static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
580 bool ipv6, bool ipv6_rx_csum)
581{
582 struct geneve_net *gn = net_generic(net, geneve_net_id);
583 struct geneve_sock *gs;
584 struct socket *sock;
585 struct udp_tunnel_sock_cfg tunnel_cfg;
586 int h;
587
588 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
589 if (!gs)
590 return ERR_PTR(-ENOMEM);
591
592 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
593 if (IS_ERR(sock)) {
594 kfree(gs);
595 return ERR_CAST(sock);
596 }
597
598 gs->sock = sock;
599 gs->refcnt = 1;
600 for (h = 0; h < VNI_HASH_SIZE; ++h)
601 INIT_HLIST_HEAD(&gs->vni_list[h]);
602
603 /* Initialize the geneve udp offloads structure */
604 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
605
606 /* Mark socket as an encapsulation socket */
607 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
608 tunnel_cfg.sk_user_data = gs;
609 tunnel_cfg.encap_type = 1;
610 tunnel_cfg.gro_receive = geneve_gro_receive;
611 tunnel_cfg.gro_complete = geneve_gro_complete;
612 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
613 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
614 tunnel_cfg.encap_destroy = NULL;
615 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
616 list_add(&gs->list, &gn->sock_list);
617 return gs;
618}
619
620static void __geneve_sock_release(struct geneve_sock *gs)
621{
622 if (!gs || --gs->refcnt)
623 return;
624
625 list_del(&gs->list);
626 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
627 udp_tunnel_sock_release(gs->sock);
628 kfree_rcu(gs, rcu);
629}
630
631static void geneve_sock_release(struct geneve_dev *geneve)
632{
633 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
634#if IS_ENABLED(CONFIG_IPV6)
635 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
636
637 rcu_assign_pointer(geneve->sock6, NULL);
638#endif
639
640 rcu_assign_pointer(geneve->sock4, NULL);
641 synchronize_net();
642
643 __geneve_sock_release(gs4);
644#if IS_ENABLED(CONFIG_IPV6)
645 __geneve_sock_release(gs6);
646#endif
647}
648
649static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
650 sa_family_t family,
651 __be16 dst_port)
652{
653 struct geneve_sock *gs;
654
655 list_for_each_entry(gs, &gn->sock_list, list) {
656 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
657 geneve_get_sk_family(gs) == family) {
658 return gs;
659 }
660 }
661 return NULL;
662}
663
664static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
665{
666 struct net *net = geneve->net;
667 struct geneve_net *gn = net_generic(net, geneve_net_id);
668 struct geneve_dev_node *node;
669 struct geneve_sock *gs;
670 __u8 vni[3];
671 __u32 hash;
672
673 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
674 if (gs) {
675 gs->refcnt++;
676 goto out;
677 }
678
679 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
680 geneve->cfg.use_udp6_rx_checksums);
681 if (IS_ERR(gs))
682 return PTR_ERR(gs);
683
684out:
685 gs->collect_md = geneve->cfg.collect_md;
686#if IS_ENABLED(CONFIG_IPV6)
687 if (ipv6) {
688 rcu_assign_pointer(geneve->sock6, gs);
689 node = &geneve->hlist6;
690 } else
691#endif
692 {
693 rcu_assign_pointer(geneve->sock4, gs);
694 node = &geneve->hlist4;
695 }
696 node->geneve = geneve;
697
698 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
699 hash = geneve_net_vni_hash(vni);
700 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
701 return 0;
702}
703
704static int geneve_open(struct net_device *dev)
705{
706 struct geneve_dev *geneve = netdev_priv(dev);
707 bool metadata = geneve->cfg.collect_md;
708 bool ipv4, ipv6;
709 int ret = 0;
710
711 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
712 ipv4 = !ipv6 || metadata;
713#if IS_ENABLED(CONFIG_IPV6)
714 if (ipv6) {
715 ret = geneve_sock_add(geneve, true);
716 if (ret < 0 && ret != -EAFNOSUPPORT)
717 ipv4 = false;
718 }
719#endif
720 if (ipv4)
721 ret = geneve_sock_add(geneve, false);
722 if (ret < 0)
723 geneve_sock_release(geneve);
724
725 return ret;
726}
727
728static int geneve_stop(struct net_device *dev)
729{
730 struct geneve_dev *geneve = netdev_priv(dev);
731
732 hlist_del_init_rcu(&geneve->hlist4.hlist);
733#if IS_ENABLED(CONFIG_IPV6)
734 hlist_del_init_rcu(&geneve->hlist6.hlist);
735#endif
736 geneve_sock_release(geneve);
737 return 0;
738}
739
740static void geneve_build_header(struct genevehdr *geneveh,
741 const struct ip_tunnel_info *info,
742 __be16 inner_proto)
743{
744 geneveh->ver = GENEVE_VER;
745 geneveh->opt_len = info->options_len / 4;
746 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
747 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
748 geneveh->rsvd1 = 0;
749 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
750 geneveh->proto_type = inner_proto;
751 geneveh->rsvd2 = 0;
752
753 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
754 ip_tunnel_info_opts_get(geneveh->options, info);
755}
756
757static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
758 const struct ip_tunnel_info *info,
759 bool xnet, int ip_hdr_len,
760 bool inner_proto_inherit)
761{
762 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
763 struct genevehdr *gnvh;
764 __be16 inner_proto;
765 int min_headroom;
766 int err;
767
768 skb_reset_mac_header(skb);
769 skb_scrub_packet(skb, xnet);
770
771 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
772 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
773 err = skb_cow_head(skb, min_headroom);
774 if (unlikely(err))
775 goto free_dst;
776
777 err = udp_tunnel_handle_offloads(skb, udp_sum);
778 if (err)
779 goto free_dst;
780
781 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
782 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
783 geneve_build_header(gnvh, info, inner_proto);
784 skb_set_inner_protocol(skb, inner_proto);
785 return 0;
786
787free_dst:
788 dst_release(dst);
789 return err;
790}
791
792static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
793 struct net_device *dev,
794 struct geneve_sock *gs4,
795 struct flowi4 *fl4,
796 const struct ip_tunnel_info *info,
797 __be16 dport, __be16 sport,
798 __u8 *full_tos)
799{
800 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
801 struct geneve_dev *geneve = netdev_priv(dev);
802 struct dst_cache *dst_cache;
803 struct rtable *rt = NULL;
804 __u8 tos;
805
806 if (!gs4)
807 return ERR_PTR(-EIO);
808
809 memset(fl4, 0, sizeof(*fl4));
810 fl4->flowi4_mark = skb->mark;
811 fl4->flowi4_proto = IPPROTO_UDP;
812 fl4->daddr = info->key.u.ipv4.dst;
813 fl4->saddr = info->key.u.ipv4.src;
814 fl4->fl4_dport = dport;
815 fl4->fl4_sport = sport;
816 fl4->flowi4_flags = info->key.flow_flags;
817
818 tos = info->key.tos;
819 if ((tos == 1) && !geneve->cfg.collect_md) {
820 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
821 use_cache = false;
822 }
823 fl4->flowi4_tos = RT_TOS(tos);
824 if (full_tos)
825 *full_tos = tos;
826
827 dst_cache = (struct dst_cache *)&info->dst_cache;
828 if (use_cache) {
829 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
830 if (rt)
831 return rt;
832 }
833 rt = ip_route_output_key(geneve->net, fl4);
834 if (IS_ERR(rt)) {
835 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
836 return ERR_PTR(-ENETUNREACH);
837 }
838 if (rt->dst.dev == dev) { /* is this necessary? */
839 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
840 ip_rt_put(rt);
841 return ERR_PTR(-ELOOP);
842 }
843 if (use_cache)
844 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
845 return rt;
846}
847
848#if IS_ENABLED(CONFIG_IPV6)
849static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
850 struct net_device *dev,
851 struct geneve_sock *gs6,
852 struct flowi6 *fl6,
853 const struct ip_tunnel_info *info,
854 __be16 dport, __be16 sport)
855{
856 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
857 struct geneve_dev *geneve = netdev_priv(dev);
858 struct dst_entry *dst = NULL;
859 struct dst_cache *dst_cache;
860 __u8 prio;
861
862 if (!gs6)
863 return ERR_PTR(-EIO);
864
865 memset(fl6, 0, sizeof(*fl6));
866 fl6->flowi6_mark = skb->mark;
867 fl6->flowi6_proto = IPPROTO_UDP;
868 fl6->daddr = info->key.u.ipv6.dst;
869 fl6->saddr = info->key.u.ipv6.src;
870 fl6->fl6_dport = dport;
871 fl6->fl6_sport = sport;
872
873 prio = info->key.tos;
874 if ((prio == 1) && !geneve->cfg.collect_md) {
875 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
876 use_cache = false;
877 }
878
879 fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
880 dst_cache = (struct dst_cache *)&info->dst_cache;
881 if (use_cache) {
882 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
883 if (dst)
884 return dst;
885 }
886 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
887 NULL);
888 if (IS_ERR(dst)) {
889 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
890 return ERR_PTR(-ENETUNREACH);
891 }
892 if (dst->dev == dev) { /* is this necessary? */
893 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
894 dst_release(dst);
895 return ERR_PTR(-ELOOP);
896 }
897
898 if (use_cache)
899 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
900 return dst;
901}
902#endif
903
904static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
905 struct geneve_dev *geneve,
906 const struct ip_tunnel_info *info)
907{
908 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
909 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
910 const struct ip_tunnel_key *key = &info->key;
911 struct rtable *rt;
912 struct flowi4 fl4;
913 __u8 full_tos;
914 __u8 tos, ttl;
915 __be16 df = 0;
916 __be16 sport;
917 int err;
918
919 if (!pskb_inet_may_pull(skb))
920 return -EINVAL;
921
922 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
923 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
924 geneve->cfg.info.key.tp_dst, sport, &full_tos);
925 if (IS_ERR(rt))
926 return PTR_ERR(rt);
927
928 err = skb_tunnel_check_pmtu(skb, &rt->dst,
929 GENEVE_IPV4_HLEN + info->options_len,
930 netif_is_any_bridge_port(dev));
931 if (err < 0) {
932 dst_release(&rt->dst);
933 return err;
934 } else if (err) {
935 struct ip_tunnel_info *info;
936
937 info = skb_tunnel_info(skb);
938 if (info) {
939 struct ip_tunnel_info *unclone;
940
941 unclone = skb_tunnel_info_unclone(skb);
942 if (unlikely(!unclone)) {
943 dst_release(&rt->dst);
944 return -ENOMEM;
945 }
946
947 unclone->key.u.ipv4.dst = fl4.saddr;
948 unclone->key.u.ipv4.src = fl4.daddr;
949 }
950
951 if (!pskb_may_pull(skb, ETH_HLEN)) {
952 dst_release(&rt->dst);
953 return -EINVAL;
954 }
955
956 skb->protocol = eth_type_trans(skb, geneve->dev);
957 __netif_rx(skb);
958 dst_release(&rt->dst);
959 return -EMSGSIZE;
960 }
961
962 if (geneve->cfg.collect_md) {
963 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
964 ttl = key->ttl;
965
966 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
967 } else {
968 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb);
969 if (geneve->cfg.ttl_inherit)
970 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
971 else
972 ttl = key->ttl;
973 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
974
975 if (geneve->cfg.df == GENEVE_DF_SET) {
976 df = htons(IP_DF);
977 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
978 struct ethhdr *eth = eth_hdr(skb);
979
980 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
981 df = htons(IP_DF);
982 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
983 struct iphdr *iph = ip_hdr(skb);
984
985 if (iph->frag_off & htons(IP_DF))
986 df = htons(IP_DF);
987 }
988 }
989 }
990
991 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
992 geneve->cfg.inner_proto_inherit);
993 if (unlikely(err))
994 return err;
995
996 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
997 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
998 !net_eq(geneve->net, dev_net(geneve->dev)),
999 !(info->key.tun_flags & TUNNEL_CSUM));
1000 return 0;
1001}
1002
1003#if IS_ENABLED(CONFIG_IPV6)
1004static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
1005 struct geneve_dev *geneve,
1006 const struct ip_tunnel_info *info)
1007{
1008 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1009 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1010 const struct ip_tunnel_key *key = &info->key;
1011 struct dst_entry *dst = NULL;
1012 struct flowi6 fl6;
1013 __u8 prio, ttl;
1014 __be16 sport;
1015 int err;
1016
1017 if (!pskb_inet_may_pull(skb))
1018 return -EINVAL;
1019
1020 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1021 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1022 geneve->cfg.info.key.tp_dst, sport);
1023 if (IS_ERR(dst))
1024 return PTR_ERR(dst);
1025
1026 err = skb_tunnel_check_pmtu(skb, dst,
1027 GENEVE_IPV6_HLEN + info->options_len,
1028 netif_is_any_bridge_port(dev));
1029 if (err < 0) {
1030 dst_release(dst);
1031 return err;
1032 } else if (err) {
1033 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1034
1035 if (info) {
1036 struct ip_tunnel_info *unclone;
1037
1038 unclone = skb_tunnel_info_unclone(skb);
1039 if (unlikely(!unclone)) {
1040 dst_release(dst);
1041 return -ENOMEM;
1042 }
1043
1044 unclone->key.u.ipv6.dst = fl6.saddr;
1045 unclone->key.u.ipv6.src = fl6.daddr;
1046 }
1047
1048 if (!pskb_may_pull(skb, ETH_HLEN)) {
1049 dst_release(dst);
1050 return -EINVAL;
1051 }
1052
1053 skb->protocol = eth_type_trans(skb, geneve->dev);
1054 __netif_rx(skb);
1055 dst_release(dst);
1056 return -EMSGSIZE;
1057 }
1058
1059 if (geneve->cfg.collect_md) {
1060 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1061 ttl = key->ttl;
1062 } else {
1063 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1064 ip_hdr(skb), skb);
1065 if (geneve->cfg.ttl_inherit)
1066 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1067 else
1068 ttl = key->ttl;
1069 ttl = ttl ? : ip6_dst_hoplimit(dst);
1070 }
1071 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1072 geneve->cfg.inner_proto_inherit);
1073 if (unlikely(err))
1074 return err;
1075
1076 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1077 &fl6.saddr, &fl6.daddr, prio, ttl,
1078 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1079 !(info->key.tun_flags & TUNNEL_CSUM));
1080 return 0;
1081}
1082#endif
1083
1084static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1085{
1086 struct geneve_dev *geneve = netdev_priv(dev);
1087 struct ip_tunnel_info *info = NULL;
1088 int err;
1089
1090 if (geneve->cfg.collect_md) {
1091 info = skb_tunnel_info(skb);
1092 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1093 netdev_dbg(dev, "no tunnel metadata\n");
1094 dev_kfree_skb(skb);
1095 dev->stats.tx_dropped++;
1096 return NETDEV_TX_OK;
1097 }
1098 } else {
1099 info = &geneve->cfg.info;
1100 }
1101
1102 rcu_read_lock();
1103#if IS_ENABLED(CONFIG_IPV6)
1104 if (info->mode & IP_TUNNEL_INFO_IPV6)
1105 err = geneve6_xmit_skb(skb, dev, geneve, info);
1106 else
1107#endif
1108 err = geneve_xmit_skb(skb, dev, geneve, info);
1109 rcu_read_unlock();
1110
1111 if (likely(!err))
1112 return NETDEV_TX_OK;
1113
1114 if (err != -EMSGSIZE)
1115 dev_kfree_skb(skb);
1116
1117 if (err == -ELOOP)
1118 dev->stats.collisions++;
1119 else if (err == -ENETUNREACH)
1120 dev->stats.tx_carrier_errors++;
1121
1122 dev->stats.tx_errors++;
1123 return NETDEV_TX_OK;
1124}
1125
1126static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1127{
1128 if (new_mtu > dev->max_mtu)
1129 new_mtu = dev->max_mtu;
1130 else if (new_mtu < dev->min_mtu)
1131 new_mtu = dev->min_mtu;
1132
1133 dev->mtu = new_mtu;
1134 return 0;
1135}
1136
1137static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1138{
1139 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1140 struct geneve_dev *geneve = netdev_priv(dev);
1141 __be16 sport;
1142
1143 if (ip_tunnel_info_af(info) == AF_INET) {
1144 struct rtable *rt;
1145 struct flowi4 fl4;
1146
1147 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1148 sport = udp_flow_src_port(geneve->net, skb,
1149 1, USHRT_MAX, true);
1150
1151 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1152 geneve->cfg.info.key.tp_dst, sport, NULL);
1153 if (IS_ERR(rt))
1154 return PTR_ERR(rt);
1155
1156 ip_rt_put(rt);
1157 info->key.u.ipv4.src = fl4.saddr;
1158#if IS_ENABLED(CONFIG_IPV6)
1159 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1160 struct dst_entry *dst;
1161 struct flowi6 fl6;
1162
1163 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1164 sport = udp_flow_src_port(geneve->net, skb,
1165 1, USHRT_MAX, true);
1166
1167 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1168 geneve->cfg.info.key.tp_dst, sport);
1169 if (IS_ERR(dst))
1170 return PTR_ERR(dst);
1171
1172 dst_release(dst);
1173 info->key.u.ipv6.src = fl6.saddr;
1174#endif
1175 } else {
1176 return -EINVAL;
1177 }
1178
1179 info->key.tp_src = sport;
1180 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1181 return 0;
1182}
1183
1184static const struct net_device_ops geneve_netdev_ops = {
1185 .ndo_init = geneve_init,
1186 .ndo_uninit = geneve_uninit,
1187 .ndo_open = geneve_open,
1188 .ndo_stop = geneve_stop,
1189 .ndo_start_xmit = geneve_xmit,
1190 .ndo_get_stats64 = dev_get_tstats64,
1191 .ndo_change_mtu = geneve_change_mtu,
1192 .ndo_validate_addr = eth_validate_addr,
1193 .ndo_set_mac_address = eth_mac_addr,
1194 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1195};
1196
1197static void geneve_get_drvinfo(struct net_device *dev,
1198 struct ethtool_drvinfo *drvinfo)
1199{
1200 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1201 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1202}
1203
1204static const struct ethtool_ops geneve_ethtool_ops = {
1205 .get_drvinfo = geneve_get_drvinfo,
1206 .get_link = ethtool_op_get_link,
1207};
1208
1209/* Info for udev, that this is a virtual tunnel endpoint */
1210static struct device_type geneve_type = {
1211 .name = "geneve",
1212};
1213
1214/* Calls the ndo_udp_tunnel_add of the caller in order to
1215 * supply the listening GENEVE udp ports. Callers are expected
1216 * to implement the ndo_udp_tunnel_add.
1217 */
1218static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1219{
1220 struct net *net = dev_net(dev);
1221 struct geneve_net *gn = net_generic(net, geneve_net_id);
1222 struct geneve_sock *gs;
1223
1224 rcu_read_lock();
1225 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1226 if (push) {
1227 udp_tunnel_push_rx_port(dev, gs->sock,
1228 UDP_TUNNEL_TYPE_GENEVE);
1229 } else {
1230 udp_tunnel_drop_rx_port(dev, gs->sock,
1231 UDP_TUNNEL_TYPE_GENEVE);
1232 }
1233 }
1234 rcu_read_unlock();
1235}
1236
1237/* Initialize the device structure. */
1238static void geneve_setup(struct net_device *dev)
1239{
1240 ether_setup(dev);
1241
1242 dev->netdev_ops = &geneve_netdev_ops;
1243 dev->ethtool_ops = &geneve_ethtool_ops;
1244 dev->needs_free_netdev = true;
1245
1246 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1247
1248 dev->features |= NETIF_F_LLTX;
1249 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1250 dev->features |= NETIF_F_RXCSUM;
1251 dev->features |= NETIF_F_GSO_SOFTWARE;
1252
1253 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1254 dev->hw_features |= NETIF_F_RXCSUM;
1255 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1256
1257 /* MTU range: 68 - (something less than 65535) */
1258 dev->min_mtu = ETH_MIN_MTU;
1259 /* The max_mtu calculation does not take account of GENEVE
1260 * options, to avoid excluding potentially valid
1261 * configurations. This will be further reduced by IPvX hdr size.
1262 */
1263 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1264
1265 netif_keep_dst(dev);
1266 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1267 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1268 eth_hw_addr_random(dev);
1269}
1270
1271static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1272 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1273 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1274 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1275 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1276 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1277 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1278 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1279 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1280 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1281 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1282 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1283 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1284 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1285 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1286 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG },
1287};
1288
1289static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1290 struct netlink_ext_ack *extack)
1291{
1292 if (tb[IFLA_ADDRESS]) {
1293 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1294 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1295 "Provided link layer address is not Ethernet");
1296 return -EINVAL;
1297 }
1298
1299 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1300 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1301 "Provided Ethernet address is not unicast");
1302 return -EADDRNOTAVAIL;
1303 }
1304 }
1305
1306 if (!data) {
1307 NL_SET_ERR_MSG(extack,
1308 "Not enough attributes provided to perform the operation");
1309 return -EINVAL;
1310 }
1311
1312 if (data[IFLA_GENEVE_ID]) {
1313 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1314
1315 if (vni >= GENEVE_N_VID) {
1316 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1317 "Geneve ID must be lower than 16777216");
1318 return -ERANGE;
1319 }
1320 }
1321
1322 if (data[IFLA_GENEVE_DF]) {
1323 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1324
1325 if (df < 0 || df > GENEVE_DF_MAX) {
1326 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1327 "Invalid DF attribute");
1328 return -EINVAL;
1329 }
1330 }
1331
1332 return 0;
1333}
1334
1335static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1336 const struct ip_tunnel_info *info,
1337 bool *tun_on_same_port,
1338 bool *tun_collect_md)
1339{
1340 struct geneve_dev *geneve, *t = NULL;
1341
1342 *tun_on_same_port = false;
1343 *tun_collect_md = false;
1344 list_for_each_entry(geneve, &gn->geneve_list, next) {
1345 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1346 *tun_collect_md = geneve->cfg.collect_md;
1347 *tun_on_same_port = true;
1348 }
1349 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1350 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1351 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1352 t = geneve;
1353 }
1354 return t;
1355}
1356
1357static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1358{
1359 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1360 info->key.ttl || info->key.label || info->key.tp_src ||
1361 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1362}
1363
1364static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1365 struct ip_tunnel_info *b)
1366{
1367 if (ip_tunnel_info_af(a) == AF_INET)
1368 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1369 else
1370 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1371}
1372
1373static int geneve_configure(struct net *net, struct net_device *dev,
1374 struct netlink_ext_ack *extack,
1375 const struct geneve_config *cfg)
1376{
1377 struct geneve_net *gn = net_generic(net, geneve_net_id);
1378 struct geneve_dev *t, *geneve = netdev_priv(dev);
1379 const struct ip_tunnel_info *info = &cfg->info;
1380 bool tun_collect_md, tun_on_same_port;
1381 int err, encap_len;
1382
1383 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1384 NL_SET_ERR_MSG(extack,
1385 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1386 return -EINVAL;
1387 }
1388
1389 geneve->net = net;
1390 geneve->dev = dev;
1391
1392 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1393 if (t)
1394 return -EBUSY;
1395
1396 /* make enough headroom for basic scenario */
1397 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1398 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1399 encap_len += sizeof(struct iphdr);
1400 dev->max_mtu -= sizeof(struct iphdr);
1401 } else {
1402 encap_len += sizeof(struct ipv6hdr);
1403 dev->max_mtu -= sizeof(struct ipv6hdr);
1404 }
1405 dev->needed_headroom = encap_len + ETH_HLEN;
1406
1407 if (cfg->collect_md) {
1408 if (tun_on_same_port) {
1409 NL_SET_ERR_MSG(extack,
1410 "There can be only one externally controlled device on a destination port");
1411 return -EPERM;
1412 }
1413 } else {
1414 if (tun_collect_md) {
1415 NL_SET_ERR_MSG(extack,
1416 "There already exists an externally controlled device on this destination port");
1417 return -EPERM;
1418 }
1419 }
1420
1421 dst_cache_reset(&geneve->cfg.info.dst_cache);
1422 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1423
1424 if (geneve->cfg.inner_proto_inherit) {
1425 dev->header_ops = NULL;
1426 dev->type = ARPHRD_NONE;
1427 dev->hard_header_len = 0;
1428 dev->addr_len = 0;
1429 dev->flags = IFF_NOARP;
1430 }
1431
1432 err = register_netdevice(dev);
1433 if (err)
1434 return err;
1435
1436 list_add(&geneve->next, &gn->geneve_list);
1437 return 0;
1438}
1439
1440static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1441{
1442 memset(info, 0, sizeof(*info));
1443 info->key.tp_dst = htons(dst_port);
1444}
1445
1446static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1447 struct netlink_ext_ack *extack,
1448 struct geneve_config *cfg, bool changelink)
1449{
1450 struct ip_tunnel_info *info = &cfg->info;
1451 int attrtype;
1452
1453 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1454 NL_SET_ERR_MSG(extack,
1455 "Cannot specify both IPv4 and IPv6 Remote addresses");
1456 return -EINVAL;
1457 }
1458
1459 if (data[IFLA_GENEVE_REMOTE]) {
1460 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1461 attrtype = IFLA_GENEVE_REMOTE;
1462 goto change_notsup;
1463 }
1464
1465 info->key.u.ipv4.dst =
1466 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1467
1468 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1469 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1470 "Remote IPv4 address cannot be Multicast");
1471 return -EINVAL;
1472 }
1473 }
1474
1475 if (data[IFLA_GENEVE_REMOTE6]) {
1476#if IS_ENABLED(CONFIG_IPV6)
1477 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1478 attrtype = IFLA_GENEVE_REMOTE6;
1479 goto change_notsup;
1480 }
1481
1482 info->mode = IP_TUNNEL_INFO_IPV6;
1483 info->key.u.ipv6.dst =
1484 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1485
1486 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1487 IPV6_ADDR_LINKLOCAL) {
1488 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1489 "Remote IPv6 address cannot be link-local");
1490 return -EINVAL;
1491 }
1492 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1493 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1494 "Remote IPv6 address cannot be Multicast");
1495 return -EINVAL;
1496 }
1497 info->key.tun_flags |= TUNNEL_CSUM;
1498 cfg->use_udp6_rx_checksums = true;
1499#else
1500 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1501 "IPv6 support not enabled in the kernel");
1502 return -EPFNOSUPPORT;
1503#endif
1504 }
1505
1506 if (data[IFLA_GENEVE_ID]) {
1507 __u32 vni;
1508 __u8 tvni[3];
1509 __be64 tunid;
1510
1511 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1512 tvni[0] = (vni & 0x00ff0000) >> 16;
1513 tvni[1] = (vni & 0x0000ff00) >> 8;
1514 tvni[2] = vni & 0x000000ff;
1515
1516 tunid = vni_to_tunnel_id(tvni);
1517 if (changelink && (tunid != info->key.tun_id)) {
1518 attrtype = IFLA_GENEVE_ID;
1519 goto change_notsup;
1520 }
1521 info->key.tun_id = tunid;
1522 }
1523
1524 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1525 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1526 cfg->ttl_inherit = true;
1527 else
1528 cfg->ttl_inherit = false;
1529 } else if (data[IFLA_GENEVE_TTL]) {
1530 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1531 cfg->ttl_inherit = false;
1532 }
1533
1534 if (data[IFLA_GENEVE_TOS])
1535 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1536
1537 if (data[IFLA_GENEVE_DF])
1538 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1539
1540 if (data[IFLA_GENEVE_LABEL]) {
1541 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1542 IPV6_FLOWLABEL_MASK;
1543 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1544 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1545 "Label attribute only applies for IPv6 Geneve devices");
1546 return -EINVAL;
1547 }
1548 }
1549
1550 if (data[IFLA_GENEVE_PORT]) {
1551 if (changelink) {
1552 attrtype = IFLA_GENEVE_PORT;
1553 goto change_notsup;
1554 }
1555 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1556 }
1557
1558 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1559 if (changelink) {
1560 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1561 goto change_notsup;
1562 }
1563 cfg->collect_md = true;
1564 }
1565
1566 if (data[IFLA_GENEVE_UDP_CSUM]) {
1567 if (changelink) {
1568 attrtype = IFLA_GENEVE_UDP_CSUM;
1569 goto change_notsup;
1570 }
1571 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1572 info->key.tun_flags |= TUNNEL_CSUM;
1573 }
1574
1575 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1576#if IS_ENABLED(CONFIG_IPV6)
1577 if (changelink) {
1578 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1579 goto change_notsup;
1580 }
1581 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1582 info->key.tun_flags &= ~TUNNEL_CSUM;
1583#else
1584 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1585 "IPv6 support not enabled in the kernel");
1586 return -EPFNOSUPPORT;
1587#endif
1588 }
1589
1590 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1591#if IS_ENABLED(CONFIG_IPV6)
1592 if (changelink) {
1593 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1594 goto change_notsup;
1595 }
1596 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1597 cfg->use_udp6_rx_checksums = false;
1598#else
1599 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1600 "IPv6 support not enabled in the kernel");
1601 return -EPFNOSUPPORT;
1602#endif
1603 }
1604
1605 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1606 if (changelink) {
1607 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1608 goto change_notsup;
1609 }
1610 cfg->inner_proto_inherit = true;
1611 }
1612
1613 return 0;
1614change_notsup:
1615 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1616 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1617 return -EOPNOTSUPP;
1618}
1619
1620static void geneve_link_config(struct net_device *dev,
1621 struct ip_tunnel_info *info, struct nlattr *tb[])
1622{
1623 struct geneve_dev *geneve = netdev_priv(dev);
1624 int ldev_mtu = 0;
1625
1626 if (tb[IFLA_MTU]) {
1627 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1628 return;
1629 }
1630
1631 switch (ip_tunnel_info_af(info)) {
1632 case AF_INET: {
1633 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1634 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1635
1636 if (!IS_ERR(rt) && rt->dst.dev) {
1637 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1638 ip_rt_put(rt);
1639 }
1640 break;
1641 }
1642#if IS_ENABLED(CONFIG_IPV6)
1643 case AF_INET6: {
1644 struct rt6_info *rt;
1645
1646 if (!__in6_dev_get(dev))
1647 break;
1648
1649 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1650 NULL, 0);
1651
1652 if (rt && rt->dst.dev)
1653 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1654 ip6_rt_put(rt);
1655 break;
1656 }
1657#endif
1658 }
1659
1660 if (ldev_mtu <= 0)
1661 return;
1662
1663 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1664}
1665
1666static int geneve_newlink(struct net *net, struct net_device *dev,
1667 struct nlattr *tb[], struct nlattr *data[],
1668 struct netlink_ext_ack *extack)
1669{
1670 struct geneve_config cfg = {
1671 .df = GENEVE_DF_UNSET,
1672 .use_udp6_rx_checksums = false,
1673 .ttl_inherit = false,
1674 .collect_md = false,
1675 };
1676 int err;
1677
1678 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1679 err = geneve_nl2info(tb, data, extack, &cfg, false);
1680 if (err)
1681 return err;
1682
1683 err = geneve_configure(net, dev, extack, &cfg);
1684 if (err)
1685 return err;
1686
1687 geneve_link_config(dev, &cfg.info, tb);
1688
1689 return 0;
1690}
1691
1692/* Quiesces the geneve device data path for both TX and RX.
1693 *
1694 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1695 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1696 * to complete for the existing set of in-flight packets to be transmitted,
1697 * then we would have quiesced the transmit data path. All the future packets
1698 * will get dropped until we unquiesce the data path.
1699 *
1700 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1701 * if we set that to NULL under RCU and wait for synchronize_net() to
1702 * complete, then we would have quiesced the receive data path.
1703 */
1704static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1705 struct geneve_sock **gs6)
1706{
1707 *gs4 = rtnl_dereference(geneve->sock4);
1708 rcu_assign_pointer(geneve->sock4, NULL);
1709 if (*gs4)
1710 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1711#if IS_ENABLED(CONFIG_IPV6)
1712 *gs6 = rtnl_dereference(geneve->sock6);
1713 rcu_assign_pointer(geneve->sock6, NULL);
1714 if (*gs6)
1715 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1716#else
1717 *gs6 = NULL;
1718#endif
1719 synchronize_net();
1720}
1721
1722/* Resumes the geneve device data path for both TX and RX. */
1723static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1724 struct geneve_sock __maybe_unused *gs6)
1725{
1726 rcu_assign_pointer(geneve->sock4, gs4);
1727 if (gs4)
1728 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1729#if IS_ENABLED(CONFIG_IPV6)
1730 rcu_assign_pointer(geneve->sock6, gs6);
1731 if (gs6)
1732 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1733#endif
1734 synchronize_net();
1735}
1736
1737static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1738 struct nlattr *data[],
1739 struct netlink_ext_ack *extack)
1740{
1741 struct geneve_dev *geneve = netdev_priv(dev);
1742 struct geneve_sock *gs4, *gs6;
1743 struct geneve_config cfg;
1744 int err;
1745
1746 /* If the geneve device is configured for metadata (or externally
1747 * controlled, for example, OVS), then nothing can be changed.
1748 */
1749 if (geneve->cfg.collect_md)
1750 return -EOPNOTSUPP;
1751
1752 /* Start with the existing info. */
1753 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1754 err = geneve_nl2info(tb, data, extack, &cfg, true);
1755 if (err)
1756 return err;
1757
1758 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1759 dst_cache_reset(&cfg.info.dst_cache);
1760 geneve_link_config(dev, &cfg.info, tb);
1761 }
1762
1763 geneve_quiesce(geneve, &gs4, &gs6);
1764 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1765 geneve_unquiesce(geneve, gs4, gs6);
1766
1767 return 0;
1768}
1769
1770static void geneve_dellink(struct net_device *dev, struct list_head *head)
1771{
1772 struct geneve_dev *geneve = netdev_priv(dev);
1773
1774 list_del(&geneve->next);
1775 unregister_netdevice_queue(dev, head);
1776}
1777
1778static size_t geneve_get_size(const struct net_device *dev)
1779{
1780 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1781 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1782 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1783 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1784 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1785 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1786 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1787 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1788 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1789 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1790 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1791 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1792 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1793 0;
1794}
1795
1796static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1797{
1798 struct geneve_dev *geneve = netdev_priv(dev);
1799 struct ip_tunnel_info *info = &geneve->cfg.info;
1800 bool ttl_inherit = geneve->cfg.ttl_inherit;
1801 bool metadata = geneve->cfg.collect_md;
1802 __u8 tmp_vni[3];
1803 __u32 vni;
1804
1805 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1806 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1807 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1808 goto nla_put_failure;
1809
1810 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1811 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1812 info->key.u.ipv4.dst))
1813 goto nla_put_failure;
1814 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1815 !!(info->key.tun_flags & TUNNEL_CSUM)))
1816 goto nla_put_failure;
1817
1818#if IS_ENABLED(CONFIG_IPV6)
1819 } else if (!metadata) {
1820 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1821 &info->key.u.ipv6.dst))
1822 goto nla_put_failure;
1823 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1824 !(info->key.tun_flags & TUNNEL_CSUM)))
1825 goto nla_put_failure;
1826#endif
1827 }
1828
1829 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1830 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1831 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1832 goto nla_put_failure;
1833
1834 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1835 goto nla_put_failure;
1836
1837 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1838 goto nla_put_failure;
1839
1840 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1841 goto nla_put_failure;
1842
1843#if IS_ENABLED(CONFIG_IPV6)
1844 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1845 !geneve->cfg.use_udp6_rx_checksums))
1846 goto nla_put_failure;
1847#endif
1848
1849 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1850 goto nla_put_failure;
1851
1852 if (geneve->cfg.inner_proto_inherit &&
1853 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1854 goto nla_put_failure;
1855
1856 return 0;
1857
1858nla_put_failure:
1859 return -EMSGSIZE;
1860}
1861
1862static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1863 .kind = "geneve",
1864 .maxtype = IFLA_GENEVE_MAX,
1865 .policy = geneve_policy,
1866 .priv_size = sizeof(struct geneve_dev),
1867 .setup = geneve_setup,
1868 .validate = geneve_validate,
1869 .newlink = geneve_newlink,
1870 .changelink = geneve_changelink,
1871 .dellink = geneve_dellink,
1872 .get_size = geneve_get_size,
1873 .fill_info = geneve_fill_info,
1874};
1875
1876struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1877 u8 name_assign_type, u16 dst_port)
1878{
1879 struct nlattr *tb[IFLA_MAX + 1];
1880 struct net_device *dev;
1881 LIST_HEAD(list_kill);
1882 int err;
1883 struct geneve_config cfg = {
1884 .df = GENEVE_DF_UNSET,
1885 .use_udp6_rx_checksums = true,
1886 .ttl_inherit = false,
1887 .collect_md = true,
1888 };
1889
1890 memset(tb, 0, sizeof(tb));
1891 dev = rtnl_create_link(net, name, name_assign_type,
1892 &geneve_link_ops, tb, NULL);
1893 if (IS_ERR(dev))
1894 return dev;
1895
1896 init_tnl_info(&cfg.info, dst_port);
1897 err = geneve_configure(net, dev, NULL, &cfg);
1898 if (err) {
1899 free_netdev(dev);
1900 return ERR_PTR(err);
1901 }
1902
1903 /* openvswitch users expect packet sizes to be unrestricted,
1904 * so set the largest MTU we can.
1905 */
1906 err = geneve_change_mtu(dev, IP_MAX_MTU);
1907 if (err)
1908 goto err;
1909
1910 err = rtnl_configure_link(dev, NULL, 0, NULL);
1911 if (err < 0)
1912 goto err;
1913
1914 return dev;
1915err:
1916 geneve_dellink(dev, &list_kill);
1917 unregister_netdevice_many(&list_kill);
1918 return ERR_PTR(err);
1919}
1920EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1921
1922static int geneve_netdevice_event(struct notifier_block *unused,
1923 unsigned long event, void *ptr)
1924{
1925 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1926
1927 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1928 geneve_offload_rx_ports(dev, true);
1929 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1930 geneve_offload_rx_ports(dev, false);
1931
1932 return NOTIFY_DONE;
1933}
1934
1935static struct notifier_block geneve_notifier_block __read_mostly = {
1936 .notifier_call = geneve_netdevice_event,
1937};
1938
1939static __net_init int geneve_init_net(struct net *net)
1940{
1941 struct geneve_net *gn = net_generic(net, geneve_net_id);
1942
1943 INIT_LIST_HEAD(&gn->geneve_list);
1944 INIT_LIST_HEAD(&gn->sock_list);
1945 return 0;
1946}
1947
1948static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1949{
1950 struct geneve_net *gn = net_generic(net, geneve_net_id);
1951 struct geneve_dev *geneve, *next;
1952 struct net_device *dev, *aux;
1953
1954 /* gather any geneve devices that were moved into this ns */
1955 for_each_netdev_safe(net, dev, aux)
1956 if (dev->rtnl_link_ops == &geneve_link_ops)
1957 unregister_netdevice_queue(dev, head);
1958
1959 /* now gather any other geneve devices that were created in this ns */
1960 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1961 /* If geneve->dev is in the same netns, it was already added
1962 * to the list by the previous loop.
1963 */
1964 if (!net_eq(dev_net(geneve->dev), net))
1965 unregister_netdevice_queue(geneve->dev, head);
1966 }
1967}
1968
1969static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1970{
1971 struct net *net;
1972 LIST_HEAD(list);
1973
1974 rtnl_lock();
1975 list_for_each_entry(net, net_list, exit_list)
1976 geneve_destroy_tunnels(net, &list);
1977
1978 /* unregister the devices gathered above */
1979 unregister_netdevice_many(&list);
1980 rtnl_unlock();
1981
1982 list_for_each_entry(net, net_list, exit_list) {
1983 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1984
1985 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1986 }
1987}
1988
1989static struct pernet_operations geneve_net_ops = {
1990 .init = geneve_init_net,
1991 .exit_batch = geneve_exit_batch_net,
1992 .id = &geneve_net_id,
1993 .size = sizeof(struct geneve_net),
1994};
1995
1996static int __init geneve_init_module(void)
1997{
1998 int rc;
1999
2000 rc = register_pernet_subsys(&geneve_net_ops);
2001 if (rc)
2002 goto out1;
2003
2004 rc = register_netdevice_notifier(&geneve_notifier_block);
2005 if (rc)
2006 goto out2;
2007
2008 rc = rtnl_link_register(&geneve_link_ops);
2009 if (rc)
2010 goto out3;
2011
2012 return 0;
2013out3:
2014 unregister_netdevice_notifier(&geneve_notifier_block);
2015out2:
2016 unregister_pernet_subsys(&geneve_net_ops);
2017out1:
2018 return rc;
2019}
2020late_initcall(geneve_init_module);
2021
2022static void __exit geneve_cleanup_module(void)
2023{
2024 rtnl_link_unregister(&geneve_link_ops);
2025 unregister_netdevice_notifier(&geneve_notifier_block);
2026 unregister_pernet_subsys(&geneve_net_ops);
2027}
2028module_exit(geneve_cleanup_module);
2029
2030MODULE_LICENSE("GPL");
2031MODULE_VERSION(GENEVE_NETDEV_VER);
2032MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
2033MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
2034MODULE_ALIAS_RTNL_LINK("geneve");