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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / drivers / net / geneve.c
blob5523f069b9a5a0c3d84f80d7f534db56bc59108c
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/protocol.h>
21
22 #define GENEVE_NETDEV_VER "0.6"
23
24 #define GENEVE_N_VID (1u << 24)
25 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
26
27 #define VNI_HASH_BITS 10
28 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
29
30 static bool log_ecn_error = true;
31 module_param(log_ecn_error, bool, 0644);
32 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
33
34 #define GENEVE_VER 0
35 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
36 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
37 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
38
39 /* per-network namespace private data for this module */
40 struct geneve_net {
41 struct list_head geneve_list;
42 struct list_head sock_list;
43 };
44
45 static unsigned int geneve_net_id;
46
47 struct geneve_dev_node {
48 struct hlist_node hlist;
49 struct geneve_dev *geneve;
50 };
51
52 struct geneve_config {
53 struct ip_tunnel_info info;
54 bool collect_md;
55 bool use_udp6_rx_checksums;
56 bool ttl_inherit;
57 enum ifla_geneve_df df;
58 };
59
60 /* Pseudo network device */
61 struct geneve_dev {
62 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
63 #if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
65 #endif
66 struct net *net; /* netns for packet i/o */
67 struct net_device *dev; /* netdev for geneve tunnel */
68 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
69 #if IS_ENABLED(CONFIG_IPV6)
70 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
71 #endif
72 struct list_head next; /* geneve's per namespace list */
73 struct gro_cells gro_cells;
74 struct geneve_config cfg;
75 };
76
77 struct geneve_sock {
78 bool collect_md;
79 struct list_head list;
80 struct socket *sock;
81 struct rcu_head rcu;
82 int refcnt;
83 struct hlist_head vni_list[VNI_HASH_SIZE];
84 };
85
86 static inline __u32 geneve_net_vni_hash(u8 vni[3])
87 {
88 __u32 vnid;
89
90 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
91 return hash_32(vnid, VNI_HASH_BITS);
92 }
93
94 static __be64 vni_to_tunnel_id(const __u8 *vni)
95 {
96 #ifdef __BIG_ENDIAN
97 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
98 #else
99 return (__force __be64)(((__force u64)vni[0] << 40) |
100 ((__force u64)vni[1] << 48) |
101 ((__force u64)vni[2] << 56));
102 #endif
103 }
104
105 /* Convert 64 bit tunnel ID to 24 bit VNI. */
106 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
107 {
108 #ifdef __BIG_ENDIAN
109 vni[0] = (__force __u8)(tun_id >> 16);
110 vni[1] = (__force __u8)(tun_id >> 8);
111 vni[2] = (__force __u8)tun_id;
112 #else
113 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
114 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
115 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
116 #endif
117 }
118
119 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
120 {
121 return !memcmp(vni, &tun_id[5], 3);
122 }
123
124 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
125 {
126 return gs->sock->sk->sk_family;
127 }
128
129 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
130 __be32 addr, u8 vni[])
131 {
132 struct hlist_head *vni_list_head;
133 struct geneve_dev_node *node;
134 __u32 hash;
135
136 /* Find the device for this VNI */
137 hash = geneve_net_vni_hash(vni);
138 vni_list_head = &gs->vni_list[hash];
139 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
140 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
141 addr == node->geneve->cfg.info.key.u.ipv4.dst)
142 return node->geneve;
143 }
144 return NULL;
145 }
146
147 #if IS_ENABLED(CONFIG_IPV6)
148 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
149 struct in6_addr addr6, u8 vni[])
150 {
151 struct hlist_head *vni_list_head;
152 struct geneve_dev_node *node;
153 __u32 hash;
154
155 /* Find the device for this VNI */
156 hash = geneve_net_vni_hash(vni);
157 vni_list_head = &gs->vni_list[hash];
158 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
159 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
160 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
161 return node->geneve;
162 }
163 return NULL;
164 }
165 #endif
166
167 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
168 {
169 return (struct genevehdr *)(udp_hdr(skb) + 1);
170 }
171
172 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
173 struct sk_buff *skb)
174 {
175 static u8 zero_vni[3];
176 u8 *vni;
177
178 if (geneve_get_sk_family(gs) == AF_INET) {
179 struct iphdr *iph;
180 __be32 addr;
181
182 iph = ip_hdr(skb); /* outer IP header... */
183
184 if (gs->collect_md) {
185 vni = zero_vni;
186 addr = 0;
187 } else {
188 vni = geneve_hdr(skb)->vni;
189 addr = iph->saddr;
190 }
191
192 return geneve_lookup(gs, addr, vni);
193 #if IS_ENABLED(CONFIG_IPV6)
194 } else if (geneve_get_sk_family(gs) == AF_INET6) {
195 static struct in6_addr zero_addr6;
196 struct ipv6hdr *ip6h;
197 struct in6_addr addr6;
198
199 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
200
201 if (gs->collect_md) {
202 vni = zero_vni;
203 addr6 = zero_addr6;
204 } else {
205 vni = geneve_hdr(skb)->vni;
206 addr6 = ip6h->saddr;
207 }
208
209 return geneve6_lookup(gs, addr6, vni);
210 #endif
211 }
212 return NULL;
213 }
214
215 /* geneve receive/decap routine */
216 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
217 struct sk_buff *skb)
218 {
219 struct genevehdr *gnvh = geneve_hdr(skb);
220 struct metadata_dst *tun_dst = NULL;
221 unsigned int len;
222 int err = 0;
223 void *oiph;
224
225 if (ip_tunnel_collect_metadata() || gs->collect_md) {
226 __be16 flags;
227
228 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
229 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
230
231 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
232 vni_to_tunnel_id(gnvh->vni),
233 gnvh->opt_len * 4);
234 if (!tun_dst) {
235 geneve->dev->stats.rx_dropped++;
236 goto drop;
237 }
238 /* Update tunnel dst according to Geneve options. */
239 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
240 gnvh->options, gnvh->opt_len * 4,
241 TUNNEL_GENEVE_OPT);
242 } else {
243 /* Drop packets w/ critical options,
244 * since we don't support any...
245 */
246 if (gnvh->critical) {
247 geneve->dev->stats.rx_frame_errors++;
248 geneve->dev->stats.rx_errors++;
249 goto drop;
250 }
251 }
252
253 skb_reset_mac_header(skb);
254 skb->protocol = eth_type_trans(skb, geneve->dev);
255 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
256
257 if (tun_dst)
258 skb_dst_set(skb, &tun_dst->dst);
259
260 /* Ignore packet loops (and multicast echo) */
261 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
262 geneve->dev->stats.rx_errors++;
263 goto drop;
264 }
265
266 oiph = skb_network_header(skb);
267 skb_reset_network_header(skb);
268
269 if (geneve_get_sk_family(gs) == AF_INET)
270 err = IP_ECN_decapsulate(oiph, skb);
271 #if IS_ENABLED(CONFIG_IPV6)
272 else
273 err = IP6_ECN_decapsulate(oiph, skb);
274 #endif
275
276 if (unlikely(err)) {
277 if (log_ecn_error) {
278 if (geneve_get_sk_family(gs) == AF_INET)
279 net_info_ratelimited("non-ECT from %pI4 "
280 "with TOS=%#x\n",
281 &((struct iphdr *)oiph)->saddr,
282 ((struct iphdr *)oiph)->tos);
283 #if IS_ENABLED(CONFIG_IPV6)
284 else
285 net_info_ratelimited("non-ECT from %pI6\n",
286 &((struct ipv6hdr *)oiph)->saddr);
287 #endif
288 }
289 if (err > 1) {
290 ++geneve->dev->stats.rx_frame_errors;
291 ++geneve->dev->stats.rx_errors;
292 goto drop;
293 }
294 }
295
296 len = skb->len;
297 err = gro_cells_receive(&geneve->gro_cells, skb);
298 if (likely(err == NET_RX_SUCCESS))
299 dev_sw_netstats_rx_add(geneve->dev, len);
300
301 return;
302 drop:
303 /* Consume bad packet */
304 kfree_skb(skb);
305 }
306
307 /* Setup stats when device is created */
308 static int geneve_init(struct net_device *dev)
309 {
310 struct geneve_dev *geneve = netdev_priv(dev);
311 int err;
312
313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
314 if (!dev->tstats)
315 return -ENOMEM;
316
317 err = gro_cells_init(&geneve->gro_cells, dev);
318 if (err) {
319 free_percpu(dev->tstats);
320 return err;
321 }
322
323 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
324 if (err) {
325 free_percpu(dev->tstats);
326 gro_cells_destroy(&geneve->gro_cells);
327 return err;
328 }
329 return 0;
330 }
331
332 static void geneve_uninit(struct net_device *dev)
333 {
334 struct geneve_dev *geneve = netdev_priv(dev);
335
336 dst_cache_destroy(&geneve->cfg.info.dst_cache);
337 gro_cells_destroy(&geneve->gro_cells);
338 free_percpu(dev->tstats);
339 }
340
341 /* Callback from net/ipv4/udp.c to receive packets */
342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
343 {
344 struct genevehdr *geneveh;
345 struct geneve_dev *geneve;
346 struct geneve_sock *gs;
347 int opts_len;
348
349 /* Need UDP and Geneve header to be present */
350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
351 goto drop;
352
353 /* Return packets with reserved bits set */
354 geneveh = geneve_hdr(skb);
355 if (unlikely(geneveh->ver != GENEVE_VER))
356 goto drop;
357
358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
359 goto drop;
360
361 gs = rcu_dereference_sk_user_data(sk);
362 if (!gs)
363 goto drop;
364
365 geneve = geneve_lookup_skb(gs, skb);
366 if (!geneve)
367 goto drop;
368
369 opts_len = geneveh->opt_len * 4;
370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
371 htons(ETH_P_TEB),
372 !net_eq(geneve->net, dev_net(geneve->dev)))) {
373 geneve->dev->stats.rx_dropped++;
374 goto drop;
375 }
376
377 geneve_rx(geneve, gs, skb);
378 return 0;
379
380 drop:
381 /* Consume bad packet */
382 kfree_skb(skb);
383 return 0;
384 }
385
386 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
387 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
388 {
389 struct genevehdr *geneveh;
390 struct geneve_sock *gs;
391 u8 zero_vni[3] = { 0 };
392 u8 *vni = zero_vni;
393
394 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
395 return -EINVAL;
396
397 geneveh = geneve_hdr(skb);
398 if (geneveh->ver != GENEVE_VER)
399 return -EINVAL;
400
401 if (geneveh->proto_type != htons(ETH_P_TEB))
402 return -EINVAL;
403
404 gs = rcu_dereference_sk_user_data(sk);
405 if (!gs)
406 return -ENOENT;
407
408 if (geneve_get_sk_family(gs) == AF_INET) {
409 struct iphdr *iph = ip_hdr(skb);
410 __be32 addr4 = 0;
411
412 if (!gs->collect_md) {
413 vni = geneve_hdr(skb)->vni;
414 addr4 = iph->daddr;
415 }
416
417 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
418 }
419
420 #if IS_ENABLED(CONFIG_IPV6)
421 if (geneve_get_sk_family(gs) == AF_INET6) {
422 struct ipv6hdr *ip6h = ipv6_hdr(skb);
423 struct in6_addr addr6;
424
425 memset(&addr6, 0, sizeof(struct in6_addr));
426
427 if (!gs->collect_md) {
428 vni = geneve_hdr(skb)->vni;
429 addr6 = ip6h->daddr;
430 }
431
432 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
433 }
434 #endif
435
436 return -EPFNOSUPPORT;
437 }
438
439 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
440 __be16 port, bool ipv6_rx_csum)
441 {
442 struct socket *sock;
443 struct udp_port_cfg udp_conf;
444 int err;
445
446 memset(&udp_conf, 0, sizeof(udp_conf));
447
448 if (ipv6) {
449 udp_conf.family = AF_INET6;
450 udp_conf.ipv6_v6only = 1;
451 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
452 } else {
453 udp_conf.family = AF_INET;
454 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
455 }
456
457 udp_conf.local_udp_port = port;
458
459 /* Open UDP socket */
460 err = udp_sock_create(net, &udp_conf, &sock);
461 if (err < 0)
462 return ERR_PTR(err);
463
464 return sock;
465 }
466
467 static int geneve_hlen(struct genevehdr *gh)
468 {
469 return sizeof(*gh) + gh->opt_len * 4;
470 }
471
472 static struct sk_buff *geneve_gro_receive(struct sock *sk,
473 struct list_head *head,
474 struct sk_buff *skb)
475 {
476 struct sk_buff *pp = NULL;
477 struct sk_buff *p;
478 struct genevehdr *gh, *gh2;
479 unsigned int hlen, gh_len, off_gnv;
480 const struct packet_offload *ptype;
481 __be16 type;
482 int flush = 1;
483
484 off_gnv = skb_gro_offset(skb);
485 hlen = off_gnv + sizeof(*gh);
486 gh = skb_gro_header_fast(skb, off_gnv);
487 if (skb_gro_header_hard(skb, hlen)) {
488 gh = skb_gro_header_slow(skb, hlen, off_gnv);
489 if (unlikely(!gh))
490 goto out;
491 }
492
493 if (gh->ver != GENEVE_VER || gh->oam)
494 goto out;
495 gh_len = geneve_hlen(gh);
496
497 hlen = off_gnv + gh_len;
498 if (skb_gro_header_hard(skb, hlen)) {
499 gh = skb_gro_header_slow(skb, hlen, off_gnv);
500 if (unlikely(!gh))
501 goto out;
502 }
503
504 list_for_each_entry(p, head, list) {
505 if (!NAPI_GRO_CB(p)->same_flow)
506 continue;
507
508 gh2 = (struct genevehdr *)(p->data + off_gnv);
509 if (gh->opt_len != gh2->opt_len ||
510 memcmp(gh, gh2, gh_len)) {
511 NAPI_GRO_CB(p)->same_flow = 0;
512 continue;
513 }
514 }
515
516 type = gh->proto_type;
517
518 rcu_read_lock();
519 ptype = gro_find_receive_by_type(type);
520 if (!ptype)
521 goto out_unlock;
522
523 skb_gro_pull(skb, gh_len);
524 skb_gro_postpull_rcsum(skb, gh, gh_len);
525 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
526 flush = 0;
527
528 out_unlock:
529 rcu_read_unlock();
530 out:
531 skb_gro_flush_final(skb, pp, flush);
532
533 return pp;
534 }
535
536 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
537 int nhoff)
538 {
539 struct genevehdr *gh;
540 struct packet_offload *ptype;
541 __be16 type;
542 int gh_len;
543 int err = -ENOSYS;
544
545 gh = (struct genevehdr *)(skb->data + nhoff);
546 gh_len = geneve_hlen(gh);
547 type = gh->proto_type;
548
549 rcu_read_lock();
550 ptype = gro_find_complete_by_type(type);
551 if (ptype)
552 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
553
554 rcu_read_unlock();
555
556 skb_set_inner_mac_header(skb, nhoff + gh_len);
557
558 return err;
559 }
560
561 /* Create new listen socket if needed */
562 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
563 bool ipv6, bool ipv6_rx_csum)
564 {
565 struct geneve_net *gn = net_generic(net, geneve_net_id);
566 struct geneve_sock *gs;
567 struct socket *sock;
568 struct udp_tunnel_sock_cfg tunnel_cfg;
569 int h;
570
571 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
572 if (!gs)
573 return ERR_PTR(-ENOMEM);
574
575 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
576 if (IS_ERR(sock)) {
577 kfree(gs);
578 return ERR_CAST(sock);
579 }
580
581 gs->sock = sock;
582 gs->refcnt = 1;
583 for (h = 0; h < VNI_HASH_SIZE; ++h)
584 INIT_HLIST_HEAD(&gs->vni_list[h]);
585
586 /* Initialize the geneve udp offloads structure */
587 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
588
589 /* Mark socket as an encapsulation socket */
590 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
591 tunnel_cfg.sk_user_data = gs;
592 tunnel_cfg.encap_type = 1;
593 tunnel_cfg.gro_receive = geneve_gro_receive;
594 tunnel_cfg.gro_complete = geneve_gro_complete;
595 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
596 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
597 tunnel_cfg.encap_destroy = NULL;
598 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
599 list_add(&gs->list, &gn->sock_list);
600 return gs;
601 }
602
603 static void __geneve_sock_release(struct geneve_sock *gs)
604 {
605 if (!gs || --gs->refcnt)
606 return;
607
608 list_del(&gs->list);
609 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
610 udp_tunnel_sock_release(gs->sock);
611 kfree_rcu(gs, rcu);
612 }
613
614 static void geneve_sock_release(struct geneve_dev *geneve)
615 {
616 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
617 #if IS_ENABLED(CONFIG_IPV6)
618 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
619
620 rcu_assign_pointer(geneve->sock6, NULL);
621 #endif
622
623 rcu_assign_pointer(geneve->sock4, NULL);
624 synchronize_net();
625
626 __geneve_sock_release(gs4);
627 #if IS_ENABLED(CONFIG_IPV6)
628 __geneve_sock_release(gs6);
629 #endif
630 }
631
632 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
633 sa_family_t family,
634 __be16 dst_port)
635 {
636 struct geneve_sock *gs;
637
638 list_for_each_entry(gs, &gn->sock_list, list) {
639 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
640 geneve_get_sk_family(gs) == family) {
641 return gs;
642 }
643 }
644 return NULL;
645 }
646
647 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
648 {
649 struct net *net = geneve->net;
650 struct geneve_net *gn = net_generic(net, geneve_net_id);
651 struct geneve_dev_node *node;
652 struct geneve_sock *gs;
653 __u8 vni[3];
654 __u32 hash;
655
656 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
657 if (gs) {
658 gs->refcnt++;
659 goto out;
660 }
661
662 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
663 geneve->cfg.use_udp6_rx_checksums);
664 if (IS_ERR(gs))
665 return PTR_ERR(gs);
666
667 out:
668 gs->collect_md = geneve->cfg.collect_md;
669 #if IS_ENABLED(CONFIG_IPV6)
670 if (ipv6) {
671 rcu_assign_pointer(geneve->sock6, gs);
672 node = &geneve->hlist6;
673 } else
674 #endif
675 {
676 rcu_assign_pointer(geneve->sock4, gs);
677 node = &geneve->hlist4;
678 }
679 node->geneve = geneve;
680
681 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
682 hash = geneve_net_vni_hash(vni);
683 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
684 return 0;
685 }
686
687 static int geneve_open(struct net_device *dev)
688 {
689 struct geneve_dev *geneve = netdev_priv(dev);
690 bool metadata = geneve->cfg.collect_md;
691 bool ipv4, ipv6;
692 int ret = 0;
693
694 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
695 ipv4 = !ipv6 || metadata;
696 #if IS_ENABLED(CONFIG_IPV6)
697 if (ipv6) {
698 ret = geneve_sock_add(geneve, true);
699 if (ret < 0 && ret != -EAFNOSUPPORT)
700 ipv4 = false;
701 }
702 #endif
703 if (ipv4)
704 ret = geneve_sock_add(geneve, false);
705 if (ret < 0)
706 geneve_sock_release(geneve);
707
708 return ret;
709 }
710
711 static int geneve_stop(struct net_device *dev)
712 {
713 struct geneve_dev *geneve = netdev_priv(dev);
714
715 hlist_del_init_rcu(&geneve->hlist4.hlist);
716 #if IS_ENABLED(CONFIG_IPV6)
717 hlist_del_init_rcu(&geneve->hlist6.hlist);
718 #endif
719 geneve_sock_release(geneve);
720 return 0;
721 }
722
723 static void geneve_build_header(struct genevehdr *geneveh,
724 const struct ip_tunnel_info *info)
725 {
726 geneveh->ver = GENEVE_VER;
727 geneveh->opt_len = info->options_len / 4;
728 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
729 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
730 geneveh->rsvd1 = 0;
731 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
732 geneveh->proto_type = htons(ETH_P_TEB);
733 geneveh->rsvd2 = 0;
734
735 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
736 ip_tunnel_info_opts_get(geneveh->options, info);
737 }
738
739 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
740 const struct ip_tunnel_info *info,
741 bool xnet, int ip_hdr_len)
742 {
743 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
744 struct genevehdr *gnvh;
745 int min_headroom;
746 int err;
747
748 skb_reset_mac_header(skb);
749 skb_scrub_packet(skb, xnet);
750
751 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
752 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
753 err = skb_cow_head(skb, min_headroom);
754 if (unlikely(err))
755 goto free_dst;
756
757 err = udp_tunnel_handle_offloads(skb, udp_sum);
758 if (err)
759 goto free_dst;
760
761 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
762 geneve_build_header(gnvh, info);
763 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
764 return 0;
765
766 free_dst:
767 dst_release(dst);
768 return err;
769 }
770
771 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
772 struct net_device *dev,
773 struct geneve_sock *gs4,
774 struct flowi4 *fl4,
775 const struct ip_tunnel_info *info,
776 __be16 dport, __be16 sport)
777 {
778 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
779 struct geneve_dev *geneve = netdev_priv(dev);
780 struct dst_cache *dst_cache;
781 struct rtable *rt = NULL;
782 __u8 tos;
783
784 if (!gs4)
785 return ERR_PTR(-EIO);
786
787 memset(fl4, 0, sizeof(*fl4));
788 fl4->flowi4_mark = skb->mark;
789 fl4->flowi4_proto = IPPROTO_UDP;
790 fl4->daddr = info->key.u.ipv4.dst;
791 fl4->saddr = info->key.u.ipv4.src;
792 fl4->fl4_dport = dport;
793 fl4->fl4_sport = sport;
794
795 tos = info->key.tos;
796 if ((tos == 1) && !geneve->cfg.collect_md) {
797 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
798 use_cache = false;
799 }
800 fl4->flowi4_tos = RT_TOS(tos);
801
802 dst_cache = (struct dst_cache *)&info->dst_cache;
803 if (use_cache) {
804 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
805 if (rt)
806 return rt;
807 }
808 rt = ip_route_output_key(geneve->net, fl4);
809 if (IS_ERR(rt)) {
810 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
811 return ERR_PTR(-ENETUNREACH);
812 }
813 if (rt->dst.dev == dev) { /* is this necessary? */
814 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
815 ip_rt_put(rt);
816 return ERR_PTR(-ELOOP);
817 }
818 if (use_cache)
819 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
820 return rt;
821 }
822
823 #if IS_ENABLED(CONFIG_IPV6)
824 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
825 struct net_device *dev,
826 struct geneve_sock *gs6,
827 struct flowi6 *fl6,
828 const struct ip_tunnel_info *info,
829 __be16 dport, __be16 sport)
830 {
831 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
832 struct geneve_dev *geneve = netdev_priv(dev);
833 struct dst_entry *dst = NULL;
834 struct dst_cache *dst_cache;
835 __u8 prio;
836
837 if (!gs6)
838 return ERR_PTR(-EIO);
839
840 memset(fl6, 0, sizeof(*fl6));
841 fl6->flowi6_mark = skb->mark;
842 fl6->flowi6_proto = IPPROTO_UDP;
843 fl6->daddr = info->key.u.ipv6.dst;
844 fl6->saddr = info->key.u.ipv6.src;
845 fl6->fl6_dport = dport;
846 fl6->fl6_sport = sport;
847
848 prio = info->key.tos;
849 if ((prio == 1) && !geneve->cfg.collect_md) {
850 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
851 use_cache = false;
852 }
853
854 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
855 info->key.label);
856 dst_cache = (struct dst_cache *)&info->dst_cache;
857 if (use_cache) {
858 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
859 if (dst)
860 return dst;
861 }
862 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
863 NULL);
864 if (IS_ERR(dst)) {
865 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
866 return ERR_PTR(-ENETUNREACH);
867 }
868 if (dst->dev == dev) { /* is this necessary? */
869 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
870 dst_release(dst);
871 return ERR_PTR(-ELOOP);
872 }
873
874 if (use_cache)
875 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
876 return dst;
877 }
878 #endif
879
880 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
881 struct geneve_dev *geneve,
882 const struct ip_tunnel_info *info)
883 {
884 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
885 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
886 const struct ip_tunnel_key *key = &info->key;
887 struct rtable *rt;
888 struct flowi4 fl4;
889 __u8 tos, ttl;
890 __be16 df = 0;
891 __be16 sport;
892 int err;
893
894 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
895 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
896 geneve->cfg.info.key.tp_dst, sport);
897 if (IS_ERR(rt))
898 return PTR_ERR(rt);
899
900 err = skb_tunnel_check_pmtu(skb, &rt->dst,
901 GENEVE_IPV4_HLEN + info->options_len,
902 netif_is_any_bridge_port(dev));
903 if (err < 0) {
904 dst_release(&rt->dst);
905 return err;
906 } else if (err) {
907 struct ip_tunnel_info *info;
908
909 info = skb_tunnel_info(skb);
910 if (info) {
911 info->key.u.ipv4.dst = fl4.saddr;
912 info->key.u.ipv4.src = fl4.daddr;
913 }
914
915 if (!pskb_may_pull(skb, ETH_HLEN)) {
916 dst_release(&rt->dst);
917 return -EINVAL;
918 }
919
920 skb->protocol = eth_type_trans(skb, geneve->dev);
921 netif_rx(skb);
922 dst_release(&rt->dst);
923 return -EMSGSIZE;
924 }
925
926 if (geneve->cfg.collect_md) {
927 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
928 ttl = key->ttl;
929
930 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
931 } else {
932 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
933 if (geneve->cfg.ttl_inherit)
934 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
935 else
936 ttl = key->ttl;
937 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
938
939 if (geneve->cfg.df == GENEVE_DF_SET) {
940 df = htons(IP_DF);
941 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
942 struct ethhdr *eth = eth_hdr(skb);
943
944 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
945 df = htons(IP_DF);
946 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
947 struct iphdr *iph = ip_hdr(skb);
948
949 if (iph->frag_off & htons(IP_DF))
950 df = htons(IP_DF);
951 }
952 }
953 }
954
955 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
956 if (unlikely(err))
957 return err;
958
959 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
960 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
961 !net_eq(geneve->net, dev_net(geneve->dev)),
962 !(info->key.tun_flags & TUNNEL_CSUM));
963 return 0;
964 }
965
966 #if IS_ENABLED(CONFIG_IPV6)
967 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
968 struct geneve_dev *geneve,
969 const struct ip_tunnel_info *info)
970 {
971 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
972 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
973 const struct ip_tunnel_key *key = &info->key;
974 struct dst_entry *dst = NULL;
975 struct flowi6 fl6;
976 __u8 prio, ttl;
977 __be16 sport;
978 int err;
979
980 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
981 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
982 geneve->cfg.info.key.tp_dst, sport);
983 if (IS_ERR(dst))
984 return PTR_ERR(dst);
985
986 err = skb_tunnel_check_pmtu(skb, dst,
987 GENEVE_IPV6_HLEN + info->options_len,
988 netif_is_any_bridge_port(dev));
989 if (err < 0) {
990 dst_release(dst);
991 return err;
992 } else if (err) {
993 struct ip_tunnel_info *info = skb_tunnel_info(skb);
994
995 if (info) {
996 info->key.u.ipv6.dst = fl6.saddr;
997 info->key.u.ipv6.src = fl6.daddr;
998 }
999
1000 if (!pskb_may_pull(skb, ETH_HLEN)) {
1001 dst_release(dst);
1002 return -EINVAL;
1003 }
1004
1005 skb->protocol = eth_type_trans(skb, geneve->dev);
1006 netif_rx(skb);
1007 dst_release(dst);
1008 return -EMSGSIZE;
1009 }
1010
1011 if (geneve->cfg.collect_md) {
1012 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1013 ttl = key->ttl;
1014 } else {
1015 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1016 ip_hdr(skb), skb);
1017 if (geneve->cfg.ttl_inherit)
1018 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1019 else
1020 ttl = key->ttl;
1021 ttl = ttl ? : ip6_dst_hoplimit(dst);
1022 }
1023 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1024 if (unlikely(err))
1025 return err;
1026
1027 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1028 &fl6.saddr, &fl6.daddr, prio, ttl,
1029 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1030 !(info->key.tun_flags & TUNNEL_CSUM));
1031 return 0;
1032 }
1033 #endif
1034
1035 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1036 {
1037 struct geneve_dev *geneve = netdev_priv(dev);
1038 struct ip_tunnel_info *info = NULL;
1039 int err;
1040
1041 if (geneve->cfg.collect_md) {
1042 info = skb_tunnel_info(skb);
1043 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1044 netdev_dbg(dev, "no tunnel metadata\n");
1045 dev_kfree_skb(skb);
1046 dev->stats.tx_dropped++;
1047 return NETDEV_TX_OK;
1048 }
1049 } else {
1050 info = &geneve->cfg.info;
1051 }
1052
1053 rcu_read_lock();
1054 #if IS_ENABLED(CONFIG_IPV6)
1055 if (info->mode & IP_TUNNEL_INFO_IPV6)
1056 err = geneve6_xmit_skb(skb, dev, geneve, info);
1057 else
1058 #endif
1059 err = geneve_xmit_skb(skb, dev, geneve, info);
1060 rcu_read_unlock();
1061
1062 if (likely(!err))
1063 return NETDEV_TX_OK;
1064
1065 if (err != -EMSGSIZE)
1066 dev_kfree_skb(skb);
1067
1068 if (err == -ELOOP)
1069 dev->stats.collisions++;
1070 else if (err == -ENETUNREACH)
1071 dev->stats.tx_carrier_errors++;
1072
1073 dev->stats.tx_errors++;
1074 return NETDEV_TX_OK;
1075 }
1076
1077 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1078 {
1079 if (new_mtu > dev->max_mtu)
1080 new_mtu = dev->max_mtu;
1081 else if (new_mtu < dev->min_mtu)
1082 new_mtu = dev->min_mtu;
1083
1084 dev->mtu = new_mtu;
1085 return 0;
1086 }
1087
1088 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1089 {
1090 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1091 struct geneve_dev *geneve = netdev_priv(dev);
1092 __be16 sport;
1093
1094 if (ip_tunnel_info_af(info) == AF_INET) {
1095 struct rtable *rt;
1096 struct flowi4 fl4;
1097
1098 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1099 sport = udp_flow_src_port(geneve->net, skb,
1100 1, USHRT_MAX, true);
1101
1102 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1103 geneve->cfg.info.key.tp_dst, sport);
1104 if (IS_ERR(rt))
1105 return PTR_ERR(rt);
1106
1107 ip_rt_put(rt);
1108 info->key.u.ipv4.src = fl4.saddr;
1109 #if IS_ENABLED(CONFIG_IPV6)
1110 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1111 struct dst_entry *dst;
1112 struct flowi6 fl6;
1113
1114 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1115 sport = udp_flow_src_port(geneve->net, skb,
1116 1, USHRT_MAX, true);
1117
1118 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1119 geneve->cfg.info.key.tp_dst, sport);
1120 if (IS_ERR(dst))
1121 return PTR_ERR(dst);
1122
1123 dst_release(dst);
1124 info->key.u.ipv6.src = fl6.saddr;
1125 #endif
1126 } else {
1127 return -EINVAL;
1128 }
1129
1130 info->key.tp_src = sport;
1131 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1132 return 0;
1133 }
1134
1135 static const struct net_device_ops geneve_netdev_ops = {
1136 .ndo_init = geneve_init,
1137 .ndo_uninit = geneve_uninit,
1138 .ndo_open = geneve_open,
1139 .ndo_stop = geneve_stop,
1140 .ndo_start_xmit = geneve_xmit,
1141 .ndo_get_stats64 = dev_get_tstats64,
1142 .ndo_change_mtu = geneve_change_mtu,
1143 .ndo_validate_addr = eth_validate_addr,
1144 .ndo_set_mac_address = eth_mac_addr,
1145 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1146 };
1147
1148 static void geneve_get_drvinfo(struct net_device *dev,
1149 struct ethtool_drvinfo *drvinfo)
1150 {
1151 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1152 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1153 }
1154
1155 static const struct ethtool_ops geneve_ethtool_ops = {
1156 .get_drvinfo = geneve_get_drvinfo,
1157 .get_link = ethtool_op_get_link,
1158 };
1159
1160 /* Info for udev, that this is a virtual tunnel endpoint */
1161 static struct device_type geneve_type = {
1162 .name = "geneve",
1163 };
1164
1165 /* Calls the ndo_udp_tunnel_add of the caller in order to
1166 * supply the listening GENEVE udp ports. Callers are expected
1167 * to implement the ndo_udp_tunnel_add.
1168 */
1169 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1170 {
1171 struct net *net = dev_net(dev);
1172 struct geneve_net *gn = net_generic(net, geneve_net_id);
1173 struct geneve_sock *gs;
1174
1175 rcu_read_lock();
1176 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1177 if (push) {
1178 udp_tunnel_push_rx_port(dev, gs->sock,
1179 UDP_TUNNEL_TYPE_GENEVE);
1180 } else {
1181 udp_tunnel_drop_rx_port(dev, gs->sock,
1182 UDP_TUNNEL_TYPE_GENEVE);
1183 }
1184 }
1185 rcu_read_unlock();
1186 }
1187
1188 /* Initialize the device structure. */
1189 static void geneve_setup(struct net_device *dev)
1190 {
1191 ether_setup(dev);
1192
1193 dev->netdev_ops = &geneve_netdev_ops;
1194 dev->ethtool_ops = &geneve_ethtool_ops;
1195 dev->needs_free_netdev = true;
1196
1197 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1198
1199 dev->features |= NETIF_F_LLTX;
1200 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1201 dev->features |= NETIF_F_RXCSUM;
1202 dev->features |= NETIF_F_GSO_SOFTWARE;
1203
1204 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1205 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1206
1207 /* MTU range: 68 - (something less than 65535) */
1208 dev->min_mtu = ETH_MIN_MTU;
1209 /* The max_mtu calculation does not take account of GENEVE
1210 * options, to avoid excluding potentially valid
1211 * configurations. This will be further reduced by IPvX hdr size.
1212 */
1213 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1214
1215 netif_keep_dst(dev);
1216 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1217 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1218 eth_hw_addr_random(dev);
1219 }
1220
1221 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1222 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1223 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1224 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1225 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1226 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1227 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1228 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1229 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1230 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1231 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1232 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1233 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1234 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1235 };
1236
1237 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1238 struct netlink_ext_ack *extack)
1239 {
1240 if (tb[IFLA_ADDRESS]) {
1241 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1242 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1243 "Provided link layer address is not Ethernet");
1244 return -EINVAL;
1245 }
1246
1247 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1248 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1249 "Provided Ethernet address is not unicast");
1250 return -EADDRNOTAVAIL;
1251 }
1252 }
1253
1254 if (!data) {
1255 NL_SET_ERR_MSG(extack,
1256 "Not enough attributes provided to perform the operation");
1257 return -EINVAL;
1258 }
1259
1260 if (data[IFLA_GENEVE_ID]) {
1261 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1262
1263 if (vni >= GENEVE_N_VID) {
1264 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1265 "Geneve ID must be lower than 16777216");
1266 return -ERANGE;
1267 }
1268 }
1269
1270 if (data[IFLA_GENEVE_DF]) {
1271 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1272
1273 if (df < 0 || df > GENEVE_DF_MAX) {
1274 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1275 "Invalid DF attribute");
1276 return -EINVAL;
1277 }
1278 }
1279
1280 return 0;
1281 }
1282
1283 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1284 const struct ip_tunnel_info *info,
1285 bool *tun_on_same_port,
1286 bool *tun_collect_md)
1287 {
1288 struct geneve_dev *geneve, *t = NULL;
1289
1290 *tun_on_same_port = false;
1291 *tun_collect_md = false;
1292 list_for_each_entry(geneve, &gn->geneve_list, next) {
1293 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1294 *tun_collect_md = geneve->cfg.collect_md;
1295 *tun_on_same_port = true;
1296 }
1297 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1298 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1299 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1300 t = geneve;
1301 }
1302 return t;
1303 }
1304
1305 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1306 {
1307 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1308 info->key.ttl || info->key.label || info->key.tp_src ||
1309 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1310 }
1311
1312 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1313 struct ip_tunnel_info *b)
1314 {
1315 if (ip_tunnel_info_af(a) == AF_INET)
1316 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1317 else
1318 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1319 }
1320
1321 static int geneve_configure(struct net *net, struct net_device *dev,
1322 struct netlink_ext_ack *extack,
1323 const struct geneve_config *cfg)
1324 {
1325 struct geneve_net *gn = net_generic(net, geneve_net_id);
1326 struct geneve_dev *t, *geneve = netdev_priv(dev);
1327 const struct ip_tunnel_info *info = &cfg->info;
1328 bool tun_collect_md, tun_on_same_port;
1329 int err, encap_len;
1330
1331 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1332 NL_SET_ERR_MSG(extack,
1333 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1334 return -EINVAL;
1335 }
1336
1337 geneve->net = net;
1338 geneve->dev = dev;
1339
1340 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1341 if (t)
1342 return -EBUSY;
1343
1344 /* make enough headroom for basic scenario */
1345 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1346 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1347 encap_len += sizeof(struct iphdr);
1348 dev->max_mtu -= sizeof(struct iphdr);
1349 } else {
1350 encap_len += sizeof(struct ipv6hdr);
1351 dev->max_mtu -= sizeof(struct ipv6hdr);
1352 }
1353 dev->needed_headroom = encap_len + ETH_HLEN;
1354
1355 if (cfg->collect_md) {
1356 if (tun_on_same_port) {
1357 NL_SET_ERR_MSG(extack,
1358 "There can be only one externally controlled device on a destination port");
1359 return -EPERM;
1360 }
1361 } else {
1362 if (tun_collect_md) {
1363 NL_SET_ERR_MSG(extack,
1364 "There already exists an externally controlled device on this destination port");
1365 return -EPERM;
1366 }
1367 }
1368
1369 dst_cache_reset(&geneve->cfg.info.dst_cache);
1370 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1371
1372 err = register_netdevice(dev);
1373 if (err)
1374 return err;
1375
1376 list_add(&geneve->next, &gn->geneve_list);
1377 return 0;
1378 }
1379
1380 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1381 {
1382 memset(info, 0, sizeof(*info));
1383 info->key.tp_dst = htons(dst_port);
1384 }
1385
1386 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1387 struct netlink_ext_ack *extack,
1388 struct geneve_config *cfg, bool changelink)
1389 {
1390 struct ip_tunnel_info *info = &cfg->info;
1391 int attrtype;
1392
1393 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1394 NL_SET_ERR_MSG(extack,
1395 "Cannot specify both IPv4 and IPv6 Remote addresses");
1396 return -EINVAL;
1397 }
1398
1399 if (data[IFLA_GENEVE_REMOTE]) {
1400 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1401 attrtype = IFLA_GENEVE_REMOTE;
1402 goto change_notsup;
1403 }
1404
1405 info->key.u.ipv4.dst =
1406 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1407
1408 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1409 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1410 "Remote IPv4 address cannot be Multicast");
1411 return -EINVAL;
1412 }
1413 }
1414
1415 if (data[IFLA_GENEVE_REMOTE6]) {
1416 #if IS_ENABLED(CONFIG_IPV6)
1417 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1418 attrtype = IFLA_GENEVE_REMOTE6;
1419 goto change_notsup;
1420 }
1421
1422 info->mode = IP_TUNNEL_INFO_IPV6;
1423 info->key.u.ipv6.dst =
1424 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1425
1426 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1427 IPV6_ADDR_LINKLOCAL) {
1428 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1429 "Remote IPv6 address cannot be link-local");
1430 return -EINVAL;
1431 }
1432 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1433 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1434 "Remote IPv6 address cannot be Multicast");
1435 return -EINVAL;
1436 }
1437 info->key.tun_flags |= TUNNEL_CSUM;
1438 cfg->use_udp6_rx_checksums = true;
1439 #else
1440 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1441 "IPv6 support not enabled in the kernel");
1442 return -EPFNOSUPPORT;
1443 #endif
1444 }
1445
1446 if (data[IFLA_GENEVE_ID]) {
1447 __u32 vni;
1448 __u8 tvni[3];
1449 __be64 tunid;
1450
1451 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1452 tvni[0] = (vni & 0x00ff0000) >> 16;
1453 tvni[1] = (vni & 0x0000ff00) >> 8;
1454 tvni[2] = vni & 0x000000ff;
1455
1456 tunid = vni_to_tunnel_id(tvni);
1457 if (changelink && (tunid != info->key.tun_id)) {
1458 attrtype = IFLA_GENEVE_ID;
1459 goto change_notsup;
1460 }
1461 info->key.tun_id = tunid;
1462 }
1463
1464 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1465 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1466 cfg->ttl_inherit = true;
1467 else
1468 cfg->ttl_inherit = false;
1469 } else if (data[IFLA_GENEVE_TTL]) {
1470 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1471 cfg->ttl_inherit = false;
1472 }
1473
1474 if (data[IFLA_GENEVE_TOS])
1475 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1476
1477 if (data[IFLA_GENEVE_DF])
1478 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1479
1480 if (data[IFLA_GENEVE_LABEL]) {
1481 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1482 IPV6_FLOWLABEL_MASK;
1483 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1484 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1485 "Label attribute only applies for IPv6 Geneve devices");
1486 return -EINVAL;
1487 }
1488 }
1489
1490 if (data[IFLA_GENEVE_PORT]) {
1491 if (changelink) {
1492 attrtype = IFLA_GENEVE_PORT;
1493 goto change_notsup;
1494 }
1495 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1496 }
1497
1498 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1499 if (changelink) {
1500 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1501 goto change_notsup;
1502 }
1503 cfg->collect_md = true;
1504 }
1505
1506 if (data[IFLA_GENEVE_UDP_CSUM]) {
1507 if (changelink) {
1508 attrtype = IFLA_GENEVE_UDP_CSUM;
1509 goto change_notsup;
1510 }
1511 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1512 info->key.tun_flags |= TUNNEL_CSUM;
1513 }
1514
1515 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1516 #if IS_ENABLED(CONFIG_IPV6)
1517 if (changelink) {
1518 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1519 goto change_notsup;
1520 }
1521 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1522 info->key.tun_flags &= ~TUNNEL_CSUM;
1523 #else
1524 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1525 "IPv6 support not enabled in the kernel");
1526 return -EPFNOSUPPORT;
1527 #endif
1528 }
1529
1530 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1531 #if IS_ENABLED(CONFIG_IPV6)
1532 if (changelink) {
1533 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1534 goto change_notsup;
1535 }
1536 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1537 cfg->use_udp6_rx_checksums = false;
1538 #else
1539 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1540 "IPv6 support not enabled in the kernel");
1541 return -EPFNOSUPPORT;
1542 #endif
1543 }
1544
1545 return 0;
1546 change_notsup:
1547 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1548 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1549 return -EOPNOTSUPP;
1550 }
1551
1552 static void geneve_link_config(struct net_device *dev,
1553 struct ip_tunnel_info *info, struct nlattr *tb[])
1554 {
1555 struct geneve_dev *geneve = netdev_priv(dev);
1556 int ldev_mtu = 0;
1557
1558 if (tb[IFLA_MTU]) {
1559 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1560 return;
1561 }
1562
1563 switch (ip_tunnel_info_af(info)) {
1564 case AF_INET: {
1565 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1566 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1567
1568 if (!IS_ERR(rt) && rt->dst.dev) {
1569 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1570 ip_rt_put(rt);
1571 }
1572 break;
1573 }
1574 #if IS_ENABLED(CONFIG_IPV6)
1575 case AF_INET6: {
1576 struct rt6_info *rt;
1577
1578 if (!__in6_dev_get(dev))
1579 break;
1580
1581 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1582 NULL, 0);
1583
1584 if (rt && rt->dst.dev)
1585 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1586 ip6_rt_put(rt);
1587 break;
1588 }
1589 #endif
1590 }
1591
1592 if (ldev_mtu <= 0)
1593 return;
1594
1595 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1596 }
1597
1598 static int geneve_newlink(struct net *net, struct net_device *dev,
1599 struct nlattr *tb[], struct nlattr *data[],
1600 struct netlink_ext_ack *extack)
1601 {
1602 struct geneve_config cfg = {
1603 .df = GENEVE_DF_UNSET,
1604 .use_udp6_rx_checksums = false,
1605 .ttl_inherit = false,
1606 .collect_md = false,
1607 };
1608 int err;
1609
1610 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1611 err = geneve_nl2info(tb, data, extack, &cfg, false);
1612 if (err)
1613 return err;
1614
1615 err = geneve_configure(net, dev, extack, &cfg);
1616 if (err)
1617 return err;
1618
1619 geneve_link_config(dev, &cfg.info, tb);
1620
1621 return 0;
1622 }
1623
1624 /* Quiesces the geneve device data path for both TX and RX.
1625 *
1626 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1627 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1628 * to complete for the existing set of in-flight packets to be transmitted,
1629 * then we would have quiesced the transmit data path. All the future packets
1630 * will get dropped until we unquiesce the data path.
1631 *
1632 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1633 * if we set that to NULL under RCU and wait for synchronize_net() to
1634 * complete, then we would have quiesced the receive data path.
1635 */
1636 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1637 struct geneve_sock **gs6)
1638 {
1639 *gs4 = rtnl_dereference(geneve->sock4);
1640 rcu_assign_pointer(geneve->sock4, NULL);
1641 if (*gs4)
1642 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1643 #if IS_ENABLED(CONFIG_IPV6)
1644 *gs6 = rtnl_dereference(geneve->sock6);
1645 rcu_assign_pointer(geneve->sock6, NULL);
1646 if (*gs6)
1647 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1648 #else
1649 *gs6 = NULL;
1650 #endif
1651 synchronize_net();
1652 }
1653
1654 /* Resumes the geneve device data path for both TX and RX. */
1655 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1656 struct geneve_sock __maybe_unused *gs6)
1657 {
1658 rcu_assign_pointer(geneve->sock4, gs4);
1659 if (gs4)
1660 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1661 #if IS_ENABLED(CONFIG_IPV6)
1662 rcu_assign_pointer(geneve->sock6, gs6);
1663 if (gs6)
1664 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1665 #endif
1666 synchronize_net();
1667 }
1668
1669 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1670 struct nlattr *data[],
1671 struct netlink_ext_ack *extack)
1672 {
1673 struct geneve_dev *geneve = netdev_priv(dev);
1674 struct geneve_sock *gs4, *gs6;
1675 struct geneve_config cfg;
1676 int err;
1677
1678 /* If the geneve device is configured for metadata (or externally
1679 * controlled, for example, OVS), then nothing can be changed.
1680 */
1681 if (geneve->cfg.collect_md)
1682 return -EOPNOTSUPP;
1683
1684 /* Start with the existing info. */
1685 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1686 err = geneve_nl2info(tb, data, extack, &cfg, true);
1687 if (err)
1688 return err;
1689
1690 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1691 dst_cache_reset(&cfg.info.dst_cache);
1692 geneve_link_config(dev, &cfg.info, tb);
1693 }
1694
1695 geneve_quiesce(geneve, &gs4, &gs6);
1696 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1697 geneve_unquiesce(geneve, gs4, gs6);
1698
1699 return 0;
1700 }
1701
1702 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1703 {
1704 struct geneve_dev *geneve = netdev_priv(dev);
1705
1706 list_del(&geneve->next);
1707 unregister_netdevice_queue(dev, head);
1708 }
1709
1710 static size_t geneve_get_size(const struct net_device *dev)
1711 {
1712 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1713 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1714 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1715 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1716 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1717 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1718 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1719 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1720 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1721 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1722 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1723 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1724 0;
1725 }
1726
1727 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1728 {
1729 struct geneve_dev *geneve = netdev_priv(dev);
1730 struct ip_tunnel_info *info = &geneve->cfg.info;
1731 bool ttl_inherit = geneve->cfg.ttl_inherit;
1732 bool metadata = geneve->cfg.collect_md;
1733 __u8 tmp_vni[3];
1734 __u32 vni;
1735
1736 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1737 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1738 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1739 goto nla_put_failure;
1740
1741 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1742 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1743 info->key.u.ipv4.dst))
1744 goto nla_put_failure;
1745 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1746 !!(info->key.tun_flags & TUNNEL_CSUM)))
1747 goto nla_put_failure;
1748
1749 #if IS_ENABLED(CONFIG_IPV6)
1750 } else if (!metadata) {
1751 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1752 &info->key.u.ipv6.dst))
1753 goto nla_put_failure;
1754 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1755 !(info->key.tun_flags & TUNNEL_CSUM)))
1756 goto nla_put_failure;
1757 #endif
1758 }
1759
1760 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1761 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1762 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1763 goto nla_put_failure;
1764
1765 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1766 goto nla_put_failure;
1767
1768 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1769 goto nla_put_failure;
1770
1771 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1772 goto nla_put_failure;
1773
1774 #if IS_ENABLED(CONFIG_IPV6)
1775 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1776 !geneve->cfg.use_udp6_rx_checksums))
1777 goto nla_put_failure;
1778 #endif
1779
1780 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1781 goto nla_put_failure;
1782
1783 return 0;
1784
1785 nla_put_failure:
1786 return -EMSGSIZE;
1787 }
1788
1789 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1790 .kind = "geneve",
1791 .maxtype = IFLA_GENEVE_MAX,
1792 .policy = geneve_policy,
1793 .priv_size = sizeof(struct geneve_dev),
1794 .setup = geneve_setup,
1795 .validate = geneve_validate,
1796 .newlink = geneve_newlink,
1797 .changelink = geneve_changelink,
1798 .dellink = geneve_dellink,
1799 .get_size = geneve_get_size,
1800 .fill_info = geneve_fill_info,
1801 };
1802
1803 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1804 u8 name_assign_type, u16 dst_port)
1805 {
1806 struct nlattr *tb[IFLA_MAX + 1];
1807 struct net_device *dev;
1808 LIST_HEAD(list_kill);
1809 int err;
1810 struct geneve_config cfg = {
1811 .df = GENEVE_DF_UNSET,
1812 .use_udp6_rx_checksums = true,
1813 .ttl_inherit = false,
1814 .collect_md = true,
1815 };
1816
1817 memset(tb, 0, sizeof(tb));
1818 dev = rtnl_create_link(net, name, name_assign_type,
1819 &geneve_link_ops, tb, NULL);
1820 if (IS_ERR(dev))
1821 return dev;
1822
1823 init_tnl_info(&cfg.info, dst_port);
1824 err = geneve_configure(net, dev, NULL, &cfg);
1825 if (err) {
1826 free_netdev(dev);
1827 return ERR_PTR(err);
1828 }
1829
1830 /* openvswitch users expect packet sizes to be unrestricted,
1831 * so set the largest MTU we can.
1832 */
1833 err = geneve_change_mtu(dev, IP_MAX_MTU);
1834 if (err)
1835 goto err;
1836
1837 err = rtnl_configure_link(dev, NULL);
1838 if (err < 0)
1839 goto err;
1840
1841 return dev;
1842 err:
1843 geneve_dellink(dev, &list_kill);
1844 unregister_netdevice_many(&list_kill);
1845 return ERR_PTR(err);
1846 }
1847 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1848
1849 static int geneve_netdevice_event(struct notifier_block *unused,
1850 unsigned long event, void *ptr)
1851 {
1852 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1853
1854 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1855 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1856 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1857 } else if (event == NETDEV_UNREGISTER) {
1858 if (!dev->udp_tunnel_nic_info)
1859 geneve_offload_rx_ports(dev, false);
1860 } else if (event == NETDEV_REGISTER) {
1861 if (!dev->udp_tunnel_nic_info)
1862 geneve_offload_rx_ports(dev, true);
1863 }
1864
1865 return NOTIFY_DONE;
1866 }
1867
1868 static struct notifier_block geneve_notifier_block __read_mostly = {
1869 .notifier_call = geneve_netdevice_event,
1870 };
1871
1872 static __net_init int geneve_init_net(struct net *net)
1873 {
1874 struct geneve_net *gn = net_generic(net, geneve_net_id);
1875
1876 INIT_LIST_HEAD(&gn->geneve_list);
1877 INIT_LIST_HEAD(&gn->sock_list);
1878 return 0;
1879 }
1880
1881 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1882 {
1883 struct geneve_net *gn = net_generic(net, geneve_net_id);
1884 struct geneve_dev *geneve, *next;
1885 struct net_device *dev, *aux;
1886
1887 /* gather any geneve devices that were moved into this ns */
1888 for_each_netdev_safe(net, dev, aux)
1889 if (dev->rtnl_link_ops == &geneve_link_ops)
1890 unregister_netdevice_queue(dev, head);
1891
1892 /* now gather any other geneve devices that were created in this ns */
1893 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1894 /* If geneve->dev is in the same netns, it was already added
1895 * to the list by the previous loop.
1896 */
1897 if (!net_eq(dev_net(geneve->dev), net))
1898 unregister_netdevice_queue(geneve->dev, head);
1899 }
1900 }
1901
1902 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1903 {
1904 struct net *net;
1905 LIST_HEAD(list);
1906
1907 rtnl_lock();
1908 list_for_each_entry(net, net_list, exit_list)
1909 geneve_destroy_tunnels(net, &list);
1910
1911 /* unregister the devices gathered above */
1912 unregister_netdevice_many(&list);
1913 rtnl_unlock();
1914
1915 list_for_each_entry(net, net_list, exit_list) {
1916 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1917
1918 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1919 }
1920 }
1921
1922 static struct pernet_operations geneve_net_ops = {
1923 .init = geneve_init_net,
1924 .exit_batch = geneve_exit_batch_net,
1925 .id = &geneve_net_id,
1926 .size = sizeof(struct geneve_net),
1927 };
1928
1929 static int __init geneve_init_module(void)
1930 {
1931 int rc;
1932
1933 rc = register_pernet_subsys(&geneve_net_ops);
1934 if (rc)
1935 goto out1;
1936
1937 rc = register_netdevice_notifier(&geneve_notifier_block);
1938 if (rc)
1939 goto out2;
1940
1941 rc = rtnl_link_register(&geneve_link_ops);
1942 if (rc)
1943 goto out3;
1944
1945 return 0;
1946 out3:
1947 unregister_netdevice_notifier(&geneve_notifier_block);
1948 out2:
1949 unregister_pernet_subsys(&geneve_net_ops);
1950 out1:
1951 return rc;
1952 }
1953 late_initcall(geneve_init_module);
1954
1955 static void __exit geneve_cleanup_module(void)
1956 {
1957 rtnl_link_unregister(&geneve_link_ops);
1958 unregister_netdevice_notifier(&geneve_notifier_block);
1959 unregister_pernet_subsys(&geneve_net_ops);
1960 }
1961 module_exit(geneve_cleanup_module);
1962
1963 MODULE_LICENSE("GPL");
1964 MODULE_VERSION(GENEVE_NETDEV_VER);
1965 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1966 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1967 MODULE_ALIAS_RTNL_LINK("geneve");
Linux with added FPC-III support