1 /*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/etherdevice.h>
16 #include <linux/hash.h>
17 #include <net/dst_metadata.h>
18 #include <net/gro_cells.h>
19 #include <net/rtnetlink.h>
20 #include <net/geneve.h>
21 #include <net/protocol.h>
22
23 #define GENEVE_NETDEV_VER "0.6"
24
25 #define GENEVE_UDP_PORT 6081
26
27 #define GENEVE_N_VID (1u << 24)
28 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
29
30 #define VNI_HASH_BITS 10
31 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
32
33 static bool log_ecn_error = true;
34 module_param(log_ecn_error, bool, 0644);
35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
36
37 #define GENEVE_VER 0
38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
41
42 /* per-network namespace private data for this module */
43 struct geneve_net {
44 struct list_head geneve_list;
45 struct list_head sock_list;
46 };
47
48 static unsigned int geneve_net_id;
49
50 struct geneve_dev_node {
51 struct hlist_node hlist;
52 struct geneve_dev *geneve;
53 };
54
55 /* Pseudo network device */
56 struct geneve_dev {
57 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
58 #if IS_ENABLED(CONFIG_IPV6)
59 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
60 #endif
61 struct net *net; /* netns for packet i/o */
62 struct net_device *dev; /* netdev for geneve tunnel */
63 struct ip_tunnel_info info;
64 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
65 #if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
67 #endif
68 struct list_head next; /* geneve's per namespace list */
69 struct gro_cells gro_cells;
70 bool collect_md;
71 bool use_udp6_rx_checksums;
72 };
73
74 struct geneve_sock {
75 bool collect_md;
76 struct list_head list;
77 struct socket *sock;
78 struct rcu_head rcu;
79 int refcnt;
80 struct hlist_head vni_list[VNI_HASH_SIZE];
81 };
82
geneve_net_vni_hash(u8 vni[3])83 static inline __u32 geneve_net_vni_hash(u8 vni[3])
84 {
85 __u32 vnid;
86
87 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
88 return hash_32(vnid, VNI_HASH_BITS);
89 }
90
vni_to_tunnel_id(const __u8 * vni)91 static __be64 vni_to_tunnel_id(const __u8 *vni)
92 {
93 #ifdef __BIG_ENDIAN
94 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
95 #else
96 return (__force __be64)(((__force u64)vni[0] << 40) |
97 ((__force u64)vni[1] << 48) |
98 ((__force u64)vni[2] << 56));
99 #endif
100 }
101
102 /* Convert 64 bit tunnel ID to 24 bit VNI. */
tunnel_id_to_vni(__be64 tun_id,__u8 * vni)103 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
104 {
105 #ifdef __BIG_ENDIAN
106 vni[0] = (__force __u8)(tun_id >> 16);
107 vni[1] = (__force __u8)(tun_id >> 8);
108 vni[2] = (__force __u8)tun_id;
109 #else
110 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
111 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
112 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
113 #endif
114 }
115
eq_tun_id_and_vni(u8 * tun_id,u8 * vni)116 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
117 {
118 return !memcmp(vni, &tun_id[5], 3);
119 }
120
geneve_get_sk_family(struct geneve_sock * gs)121 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
122 {
123 return gs->sock->sk->sk_family;
124 }
125
geneve_lookup(struct geneve_sock * gs,__be32 addr,u8 vni[])126 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
127 __be32 addr, u8 vni[])
128 {
129 struct hlist_head *vni_list_head;
130 struct geneve_dev_node *node;
131 __u32 hash;
132
133 /* Find the device for this VNI */
134 hash = geneve_net_vni_hash(vni);
135 vni_list_head = &gs->vni_list[hash];
136 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
137 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
138 addr == node->geneve->info.key.u.ipv4.dst)
139 return node->geneve;
140 }
141 return NULL;
142 }
143
144 #if IS_ENABLED(CONFIG_IPV6)
geneve6_lookup(struct geneve_sock * gs,struct in6_addr addr6,u8 vni[])145 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
146 struct in6_addr addr6, u8 vni[])
147 {
148 struct hlist_head *vni_list_head;
149 struct geneve_dev_node *node;
150 __u32 hash;
151
152 /* Find the device for this VNI */
153 hash = geneve_net_vni_hash(vni);
154 vni_list_head = &gs->vni_list[hash];
155 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
156 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
157 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
158 return node->geneve;
159 }
160 return NULL;
161 }
162 #endif
163
geneve_hdr(const struct sk_buff * skb)164 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
165 {
166 return (struct genevehdr *)(udp_hdr(skb) + 1);
167 }
168
geneve_lookup_skb(struct geneve_sock * gs,struct sk_buff * skb)169 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
170 struct sk_buff *skb)
171 {
172 static u8 zero_vni[3];
173 u8 *vni;
174
175 if (geneve_get_sk_family(gs) == AF_INET) {
176 struct iphdr *iph;
177 __be32 addr;
178
179 iph = ip_hdr(skb); /* outer IP header... */
180
181 if (gs->collect_md) {
182 vni = zero_vni;
183 addr = 0;
184 } else {
185 vni = geneve_hdr(skb)->vni;
186 addr = iph->saddr;
187 }
188
189 return geneve_lookup(gs, addr, vni);
190 #if IS_ENABLED(CONFIG_IPV6)
191 } else if (geneve_get_sk_family(gs) == AF_INET6) {
192 static struct in6_addr zero_addr6;
193 struct ipv6hdr *ip6h;
194 struct in6_addr addr6;
195
196 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
197
198 if (gs->collect_md) {
199 vni = zero_vni;
200 addr6 = zero_addr6;
201 } else {
202 vni = geneve_hdr(skb)->vni;
203 addr6 = ip6h->saddr;
204 }
205
206 return geneve6_lookup(gs, addr6, vni);
207 #endif
208 }
209 return NULL;
210 }
211
212 /* geneve receive/decap routine */
geneve_rx(struct geneve_dev * geneve,struct geneve_sock * gs,struct sk_buff * skb)213 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
214 struct sk_buff *skb)
215 {
216 struct genevehdr *gnvh = geneve_hdr(skb);
217 struct metadata_dst *tun_dst = NULL;
218 struct pcpu_sw_netstats *stats;
219 unsigned int len;
220 int err = 0;
221 void *oiph;
222
223 if (ip_tunnel_collect_metadata() || gs->collect_md) {
224 __be16 flags;
225
226 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
227 (gnvh->oam ? TUNNEL_OAM : 0) |
228 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
229
230 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
231 vni_to_tunnel_id(gnvh->vni),
232 gnvh->opt_len * 4);
233 if (!tun_dst) {
234 geneve->dev->stats.rx_dropped++;
235 goto drop;
236 }
237 /* Update tunnel dst according to Geneve options. */
238 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
239 gnvh->options, gnvh->opt_len * 4,
240 TUNNEL_GENEVE_OPT);
241 } else {
242 /* Drop packets w/ critical options,
243 * since we don't support any...
244 */
245 if (gnvh->critical) {
246 geneve->dev->stats.rx_frame_errors++;
247 geneve->dev->stats.rx_errors++;
248 goto drop;
249 }
250 }
251
252 skb_reset_mac_header(skb);
253 skb->protocol = eth_type_trans(skb, geneve->dev);
254 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
255
256 if (tun_dst)
257 skb_dst_set(skb, &tun_dst->dst);
258
259 /* Ignore packet loops (and multicast echo) */
260 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
261 geneve->dev->stats.rx_errors++;
262 goto drop;
263 }
264
265 oiph = skb_network_header(skb);
266 skb_reset_network_header(skb);
267
268 if (geneve_get_sk_family(gs) == AF_INET)
269 err = IP_ECN_decapsulate(oiph, skb);
270 #if IS_ENABLED(CONFIG_IPV6)
271 else
272 err = IP6_ECN_decapsulate(oiph, skb);
273 #endif
274
275 if (unlikely(err)) {
276 if (log_ecn_error) {
277 if (geneve_get_sk_family(gs) == AF_INET)
278 net_info_ratelimited("non-ECT from %pI4 "
279 "with TOS=%#x\n",
280 &((struct iphdr *)oiph)->saddr,
281 ((struct iphdr *)oiph)->tos);
282 #if IS_ENABLED(CONFIG_IPV6)
283 else
284 net_info_ratelimited("non-ECT from %pI6\n",
285 &((struct ipv6hdr *)oiph)->saddr);
286 #endif
287 }
288 if (err > 1) {
289 ++geneve->dev->stats.rx_frame_errors;
290 ++geneve->dev->stats.rx_errors;
291 goto drop;
292 }
293 }
294
295 len = skb->len;
296 err = gro_cells_receive(&geneve->gro_cells, skb);
297 if (likely(err == NET_RX_SUCCESS)) {
298 stats = this_cpu_ptr(geneve->dev->tstats);
299 u64_stats_update_begin(&stats->syncp);
300 stats->rx_packets++;
301 stats->rx_bytes += len;
302 u64_stats_update_end(&stats->syncp);
303 }
304 return;
305 drop:
306 /* Consume bad packet */
307 kfree_skb(skb);
308 }
309
310 /* Setup stats when device is created */
geneve_init(struct net_device * dev)311 static int geneve_init(struct net_device *dev)
312 {
313 struct geneve_dev *geneve = netdev_priv(dev);
314 int err;
315
316 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
317 if (!dev->tstats)
318 return -ENOMEM;
319
320 err = gro_cells_init(&geneve->gro_cells, dev);
321 if (err) {
322 free_percpu(dev->tstats);
323 return err;
324 }
325
326 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
327 if (err) {
328 free_percpu(dev->tstats);
329 gro_cells_destroy(&geneve->gro_cells);
330 return err;
331 }
332 return 0;
333 }
334
geneve_uninit(struct net_device * dev)335 static void geneve_uninit(struct net_device *dev)
336 {
337 struct geneve_dev *geneve = netdev_priv(dev);
338
339 dst_cache_destroy(&geneve->info.dst_cache);
340 gro_cells_destroy(&geneve->gro_cells);
341 free_percpu(dev->tstats);
342 }
343
344 /* Callback from net/ipv4/udp.c to receive packets */
geneve_udp_encap_recv(struct sock * sk,struct sk_buff * skb)345 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
346 {
347 struct genevehdr *geneveh;
348 struct geneve_dev *geneve;
349 struct geneve_sock *gs;
350 int opts_len;
351
352 /* Need UDP and Geneve header to be present */
353 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
354 goto drop;
355
356 /* Return packets with reserved bits set */
357 geneveh = geneve_hdr(skb);
358 if (unlikely(geneveh->ver != GENEVE_VER))
359 goto drop;
360
361 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
362 goto drop;
363
364 gs = rcu_dereference_sk_user_data(sk);
365 if (!gs)
366 goto drop;
367
368 geneve = geneve_lookup_skb(gs, skb);
369 if (!geneve)
370 goto drop;
371
372 opts_len = geneveh->opt_len * 4;
373 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
374 htons(ETH_P_TEB),
375 !net_eq(geneve->net, dev_net(geneve->dev)))) {
376 geneve->dev->stats.rx_dropped++;
377 goto drop;
378 }
379
380 geneve_rx(geneve, gs, skb);
381 return 0;
382
383 drop:
384 /* Consume bad packet */
385 kfree_skb(skb);
386 return 0;
387 }
388
geneve_create_sock(struct net * net,bool ipv6,__be16 port,bool ipv6_rx_csum)389 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
390 __be16 port, bool ipv6_rx_csum)
391 {
392 struct socket *sock;
393 struct udp_port_cfg udp_conf;
394 int err;
395
396 memset(&udp_conf, 0, sizeof(udp_conf));
397
398 if (ipv6) {
399 udp_conf.family = AF_INET6;
400 udp_conf.ipv6_v6only = 1;
401 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
402 } else {
403 udp_conf.family = AF_INET;
404 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
405 }
406
407 udp_conf.local_udp_port = port;
408
409 /* Open UDP socket */
410 err = udp_sock_create(net, &udp_conf, &sock);
411 if (err < 0)
412 return ERR_PTR(err);
413
414 return sock;
415 }
416
geneve_hlen(struct genevehdr * gh)417 static int geneve_hlen(struct genevehdr *gh)
418 {
419 return sizeof(*gh) + gh->opt_len * 4;
420 }
421
geneve_gro_receive(struct sock * sk,struct list_head * head,struct sk_buff * skb)422 static struct sk_buff *geneve_gro_receive(struct sock *sk,
423 struct list_head *head,
424 struct sk_buff *skb)
425 {
426 struct sk_buff *pp = NULL;
427 struct sk_buff *p;
428 struct genevehdr *gh, *gh2;
429 unsigned int hlen, gh_len, off_gnv;
430 const struct packet_offload *ptype;
431 __be16 type;
432 int flush = 1;
433
434 off_gnv = skb_gro_offset(skb);
435 hlen = off_gnv + sizeof(*gh);
436 gh = skb_gro_header_fast(skb, off_gnv);
437 if (skb_gro_header_hard(skb, hlen)) {
438 gh = skb_gro_header_slow(skb, hlen, off_gnv);
439 if (unlikely(!gh))
440 goto out;
441 }
442
443 if (gh->ver != GENEVE_VER || gh->oam)
444 goto out;
445 gh_len = geneve_hlen(gh);
446
447 hlen = off_gnv + gh_len;
448 if (skb_gro_header_hard(skb, hlen)) {
449 gh = skb_gro_header_slow(skb, hlen, off_gnv);
450 if (unlikely(!gh))
451 goto out;
452 }
453
454 list_for_each_entry(p, head, list) {
455 if (!NAPI_GRO_CB(p)->same_flow)
456 continue;
457
458 gh2 = (struct genevehdr *)(p->data + off_gnv);
459 if (gh->opt_len != gh2->opt_len ||
460 memcmp(gh, gh2, gh_len)) {
461 NAPI_GRO_CB(p)->same_flow = 0;
462 continue;
463 }
464 }
465
466 type = gh->proto_type;
467
468 rcu_read_lock();
469 ptype = gro_find_receive_by_type(type);
470 if (!ptype)
471 goto out_unlock;
472
473 skb_gro_pull(skb, gh_len);
474 skb_gro_postpull_rcsum(skb, gh, gh_len);
475 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
476 flush = 0;
477
478 out_unlock:
479 rcu_read_unlock();
480 out:
481 skb_gro_flush_final(skb, pp, flush);
482
483 return pp;
484 }
485
geneve_gro_complete(struct sock * sk,struct sk_buff * skb,int nhoff)486 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
487 int nhoff)
488 {
489 struct genevehdr *gh;
490 struct packet_offload *ptype;
491 __be16 type;
492 int gh_len;
493 int err = -ENOSYS;
494
495 gh = (struct genevehdr *)(skb->data + nhoff);
496 gh_len = geneve_hlen(gh);
497 type = gh->proto_type;
498
499 rcu_read_lock();
500 ptype = gro_find_complete_by_type(type);
501 if (ptype)
502 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
503
504 rcu_read_unlock();
505
506 skb_set_inner_mac_header(skb, nhoff + gh_len);
507
508 return err;
509 }
510
511 /* Create new listen socket if needed */
geneve_socket_create(struct net * net,__be16 port,bool ipv6,bool ipv6_rx_csum)512 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
513 bool ipv6, bool ipv6_rx_csum)
514 {
515 struct geneve_net *gn = net_generic(net, geneve_net_id);
516 struct geneve_sock *gs;
517 struct socket *sock;
518 struct udp_tunnel_sock_cfg tunnel_cfg;
519 int h;
520
521 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
522 if (!gs)
523 return ERR_PTR(-ENOMEM);
524
525 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
526 if (IS_ERR(sock)) {
527 kfree(gs);
528 return ERR_CAST(sock);
529 }
530
531 gs->sock = sock;
532 gs->refcnt = 1;
533 for (h = 0; h < VNI_HASH_SIZE; ++h)
534 INIT_HLIST_HEAD(&gs->vni_list[h]);
535
536 /* Initialize the geneve udp offloads structure */
537 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
538
539 /* Mark socket as an encapsulation socket */
540 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
541 tunnel_cfg.sk_user_data = gs;
542 tunnel_cfg.encap_type = 1;
543 tunnel_cfg.gro_receive = geneve_gro_receive;
544 tunnel_cfg.gro_complete = geneve_gro_complete;
545 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
546 tunnel_cfg.encap_destroy = NULL;
547 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
548 list_add(&gs->list, &gn->sock_list);
549 return gs;
550 }
551
__geneve_sock_release(struct geneve_sock * gs)552 static void __geneve_sock_release(struct geneve_sock *gs)
553 {
554 if (!gs || --gs->refcnt)
555 return;
556
557 list_del(&gs->list);
558 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
559 udp_tunnel_sock_release(gs->sock);
560 kfree_rcu(gs, rcu);
561 }
562
geneve_sock_release(struct geneve_dev * geneve)563 static void geneve_sock_release(struct geneve_dev *geneve)
564 {
565 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
566 #if IS_ENABLED(CONFIG_IPV6)
567 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
568
569 rcu_assign_pointer(geneve->sock6, NULL);
570 #endif
571
572 rcu_assign_pointer(geneve->sock4, NULL);
573 synchronize_net();
574
575 __geneve_sock_release(gs4);
576 #if IS_ENABLED(CONFIG_IPV6)
577 __geneve_sock_release(gs6);
578 #endif
579 }
580
geneve_find_sock(struct geneve_net * gn,sa_family_t family,__be16 dst_port)581 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
582 sa_family_t family,
583 __be16 dst_port)
584 {
585 struct geneve_sock *gs;
586
587 list_for_each_entry(gs, &gn->sock_list, list) {
588 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
589 geneve_get_sk_family(gs) == family) {
590 return gs;
591 }
592 }
593 return NULL;
594 }
595
geneve_sock_add(struct geneve_dev * geneve,bool ipv6)596 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
597 {
598 struct net *net = geneve->net;
599 struct geneve_net *gn = net_generic(net, geneve_net_id);
600 struct geneve_dev_node *node;
601 struct geneve_sock *gs;
602 __u8 vni[3];
603 __u32 hash;
604
605 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
606 if (gs) {
607 gs->refcnt++;
608 goto out;
609 }
610
611 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
612 geneve->use_udp6_rx_checksums);
613 if (IS_ERR(gs))
614 return PTR_ERR(gs);
615
616 out:
617 gs->collect_md = geneve->collect_md;
618 #if IS_ENABLED(CONFIG_IPV6)
619 if (ipv6) {
620 rcu_assign_pointer(geneve->sock6, gs);
621 node = &geneve->hlist6;
622 } else
623 #endif
624 {
625 rcu_assign_pointer(geneve->sock4, gs);
626 node = &geneve->hlist4;
627 }
628 node->geneve = geneve;
629
630 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
631 hash = geneve_net_vni_hash(vni);
632 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
633 return 0;
634 }
635
geneve_open(struct net_device * dev)636 static int geneve_open(struct net_device *dev)
637 {
638 struct geneve_dev *geneve = netdev_priv(dev);
639 bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
640 bool metadata = geneve->collect_md;
641 int ret = 0;
642
643 #if IS_ENABLED(CONFIG_IPV6)
644 if (ipv6 || metadata)
645 ret = geneve_sock_add(geneve, true);
646 #endif
647 if (!ret && (!ipv6 || metadata))
648 ret = geneve_sock_add(geneve, false);
649 if (ret < 0)
650 geneve_sock_release(geneve);
651
652 return ret;
653 }
654
geneve_stop(struct net_device * dev)655 static int geneve_stop(struct net_device *dev)
656 {
657 struct geneve_dev *geneve = netdev_priv(dev);
658
659 hlist_del_init_rcu(&geneve->hlist4.hlist);
660 #if IS_ENABLED(CONFIG_IPV6)
661 hlist_del_init_rcu(&geneve->hlist6.hlist);
662 #endif
663 geneve_sock_release(geneve);
664 return 0;
665 }
666
geneve_build_header(struct genevehdr * geneveh,const struct ip_tunnel_info * info)667 static void geneve_build_header(struct genevehdr *geneveh,
668 const struct ip_tunnel_info *info)
669 {
670 geneveh->ver = GENEVE_VER;
671 geneveh->opt_len = info->options_len / 4;
672 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
673 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
674 geneveh->rsvd1 = 0;
675 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
676 geneveh->proto_type = htons(ETH_P_TEB);
677 geneveh->rsvd2 = 0;
678
679 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
680 ip_tunnel_info_opts_get(geneveh->options, info);
681 }
682
geneve_build_skb(struct dst_entry * dst,struct sk_buff * skb,const struct ip_tunnel_info * info,bool xnet,int ip_hdr_len)683 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
684 const struct ip_tunnel_info *info,
685 bool xnet, int ip_hdr_len)
686 {
687 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
688 struct genevehdr *gnvh;
689 int min_headroom;
690 int err;
691
692 skb_reset_mac_header(skb);
693 skb_scrub_packet(skb, xnet);
694
695 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
696 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
697 err = skb_cow_head(skb, min_headroom);
698 if (unlikely(err))
699 goto free_dst;
700
701 err = udp_tunnel_handle_offloads(skb, udp_sum);
702 if (err)
703 goto free_dst;
704
705 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
706 geneve_build_header(gnvh, info);
707 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
708 return 0;
709
710 free_dst:
711 dst_release(dst);
712 return err;
713 }
714
geneve_get_v4_rt(struct sk_buff * skb,struct net_device * dev,struct geneve_sock * gs4,struct flowi4 * fl4,const struct ip_tunnel_info * info)715 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
716 struct net_device *dev,
717 struct geneve_sock *gs4,
718 struct flowi4 *fl4,
719 const struct ip_tunnel_info *info)
720 {
721 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
722 struct geneve_dev *geneve = netdev_priv(dev);
723 struct dst_cache *dst_cache;
724 struct rtable *rt = NULL;
725 __u8 tos;
726
727 if (!gs4)
728 return ERR_PTR(-EIO);
729
730 memset(fl4, 0, sizeof(*fl4));
731 fl4->flowi4_mark = skb->mark;
732 fl4->flowi4_proto = IPPROTO_UDP;
733 fl4->daddr = info->key.u.ipv4.dst;
734 fl4->saddr = info->key.u.ipv4.src;
735
736 tos = info->key.tos;
737 if ((tos == 1) && !geneve->collect_md) {
738 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
739 use_cache = false;
740 }
741 fl4->flowi4_tos = RT_TOS(tos);
742
743 dst_cache = (struct dst_cache *)&info->dst_cache;
744 if (use_cache) {
745 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
746 if (rt)
747 return rt;
748 }
749 rt = ip_route_output_key(geneve->net, fl4);
750 if (IS_ERR(rt)) {
751 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
752 return ERR_PTR(-ENETUNREACH);
753 }
754 if (rt->dst.dev == dev) { /* is this necessary? */
755 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
756 ip_rt_put(rt);
757 return ERR_PTR(-ELOOP);
758 }
759 if (use_cache)
760 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
761 return rt;
762 }
763
764 #if IS_ENABLED(CONFIG_IPV6)
geneve_get_v6_dst(struct sk_buff * skb,struct net_device * dev,struct geneve_sock * gs6,struct flowi6 * fl6,const struct ip_tunnel_info * info)765 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
766 struct net_device *dev,
767 struct geneve_sock *gs6,
768 struct flowi6 *fl6,
769 const struct ip_tunnel_info *info)
770 {
771 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
772 struct geneve_dev *geneve = netdev_priv(dev);
773 struct dst_entry *dst = NULL;
774 struct dst_cache *dst_cache;
775 __u8 prio;
776
777 if (!gs6)
778 return ERR_PTR(-EIO);
779
780 memset(fl6, 0, sizeof(*fl6));
781 fl6->flowi6_mark = skb->mark;
782 fl6->flowi6_proto = IPPROTO_UDP;
783 fl6->daddr = info->key.u.ipv6.dst;
784 fl6->saddr = info->key.u.ipv6.src;
785 prio = info->key.tos;
786 if ((prio == 1) && !geneve->collect_md) {
787 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
788 use_cache = false;
789 }
790
791 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
792 info->key.label);
793 dst_cache = (struct dst_cache *)&info->dst_cache;
794 if (use_cache) {
795 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
796 if (dst)
797 return dst;
798 }
799 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
800 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
801 return ERR_PTR(-ENETUNREACH);
802 }
803 if (dst->dev == dev) { /* is this necessary? */
804 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
805 dst_release(dst);
806 return ERR_PTR(-ELOOP);
807 }
808
809 if (use_cache)
810 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
811 return dst;
812 }
813 #endif
814
geneve_xmit_skb(struct sk_buff * skb,struct net_device * dev,struct geneve_dev * geneve,const struct ip_tunnel_info * info)815 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
816 struct geneve_dev *geneve,
817 const struct ip_tunnel_info *info)
818 {
819 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
820 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
821 const struct ip_tunnel_key *key = &info->key;
822 struct rtable *rt;
823 struct flowi4 fl4;
824 __u8 tos, ttl;
825 __be16 sport;
826 __be16 df;
827 int err;
828
829 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
830 if (IS_ERR(rt))
831 return PTR_ERR(rt);
832
833 skb_tunnel_check_pmtu(skb, &rt->dst,
834 GENEVE_IPV4_HLEN + info->options_len);
835
836 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
837 if (geneve->collect_md) {
838 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
839 ttl = key->ttl;
840 } else {
841 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
842 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
843 }
844 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
845
846 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
847 if (unlikely(err))
848 return err;
849
850 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
851 tos, ttl, df, sport, geneve->info.key.tp_dst,
852 !net_eq(geneve->net, dev_net(geneve->dev)),
853 !(info->key.tun_flags & TUNNEL_CSUM));
854 return 0;
855 }
856
857 #if IS_ENABLED(CONFIG_IPV6)
geneve6_xmit_skb(struct sk_buff * skb,struct net_device * dev,struct geneve_dev * geneve,const struct ip_tunnel_info * info)858 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
859 struct geneve_dev *geneve,
860 const struct ip_tunnel_info *info)
861 {
862 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
863 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
864 const struct ip_tunnel_key *key = &info->key;
865 struct dst_entry *dst = NULL;
866 struct flowi6 fl6;
867 __u8 prio, ttl;
868 __be16 sport;
869 int err;
870
871 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
872 if (IS_ERR(dst))
873 return PTR_ERR(dst);
874
875 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
876
877 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
878 if (geneve->collect_md) {
879 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
880 ttl = key->ttl;
881 } else {
882 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
883 ip_hdr(skb), skb);
884 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
885 }
886 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
887 if (unlikely(err))
888 return err;
889
890 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
891 &fl6.saddr, &fl6.daddr, prio, ttl,
892 info->key.label, sport, geneve->info.key.tp_dst,
893 !(info->key.tun_flags & TUNNEL_CSUM));
894 return 0;
895 }
896 #endif
897
geneve_xmit(struct sk_buff * skb,struct net_device * dev)898 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
899 {
900 struct geneve_dev *geneve = netdev_priv(dev);
901 struct ip_tunnel_info *info = NULL;
902 int err;
903
904 if (geneve->collect_md) {
905 info = skb_tunnel_info(skb);
906 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
907 err = -EINVAL;
908 netdev_dbg(dev, "no tunnel metadata\n");
909 goto tx_error;
910 }
911 } else {
912 info = &geneve->info;
913 }
914
915 rcu_read_lock();
916 #if IS_ENABLED(CONFIG_IPV6)
917 if (info->mode & IP_TUNNEL_INFO_IPV6)
918 err = geneve6_xmit_skb(skb, dev, geneve, info);
919 else
920 #endif
921 err = geneve_xmit_skb(skb, dev, geneve, info);
922 rcu_read_unlock();
923
924 if (likely(!err))
925 return NETDEV_TX_OK;
926 tx_error:
927 dev_kfree_skb(skb);
928
929 if (err == -ELOOP)
930 dev->stats.collisions++;
931 else if (err == -ENETUNREACH)
932 dev->stats.tx_carrier_errors++;
933
934 dev->stats.tx_errors++;
935 return NETDEV_TX_OK;
936 }
937
geneve_change_mtu(struct net_device * dev,int new_mtu)938 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
939 {
940 if (new_mtu > dev->max_mtu)
941 new_mtu = dev->max_mtu;
942 else if (new_mtu < dev->min_mtu)
943 new_mtu = dev->min_mtu;
944
945 dev->mtu = new_mtu;
946 return 0;
947 }
948
geneve_fill_metadata_dst(struct net_device * dev,struct sk_buff * skb)949 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
950 {
951 struct ip_tunnel_info *info = skb_tunnel_info(skb);
952 struct geneve_dev *geneve = netdev_priv(dev);
953
954 if (ip_tunnel_info_af(info) == AF_INET) {
955 struct rtable *rt;
956 struct flowi4 fl4;
957 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
958
959 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
960 if (IS_ERR(rt))
961 return PTR_ERR(rt);
962
963 ip_rt_put(rt);
964 info->key.u.ipv4.src = fl4.saddr;
965 #if IS_ENABLED(CONFIG_IPV6)
966 } else if (ip_tunnel_info_af(info) == AF_INET6) {
967 struct dst_entry *dst;
968 struct flowi6 fl6;
969 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
970
971 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
972 if (IS_ERR(dst))
973 return PTR_ERR(dst);
974
975 dst_release(dst);
976 info->key.u.ipv6.src = fl6.saddr;
977 #endif
978 } else {
979 return -EINVAL;
980 }
981
982 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
983 1, USHRT_MAX, true);
984 info->key.tp_dst = geneve->info.key.tp_dst;
985 return 0;
986 }
987
988 static const struct net_device_ops geneve_netdev_ops = {
989 .ndo_init = geneve_init,
990 .ndo_uninit = geneve_uninit,
991 .ndo_open = geneve_open,
992 .ndo_stop = geneve_stop,
993 .ndo_start_xmit = geneve_xmit,
994 .ndo_get_stats64 = ip_tunnel_get_stats64,
995 .ndo_change_mtu = geneve_change_mtu,
996 .ndo_validate_addr = eth_validate_addr,
997 .ndo_set_mac_address = eth_mac_addr,
998 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
999 };
1000
geneve_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * drvinfo)1001 static void geneve_get_drvinfo(struct net_device *dev,
1002 struct ethtool_drvinfo *drvinfo)
1003 {
1004 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1005 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1006 }
1007
1008 static const struct ethtool_ops geneve_ethtool_ops = {
1009 .get_drvinfo = geneve_get_drvinfo,
1010 .get_link = ethtool_op_get_link,
1011 };
1012
1013 /* Info for udev, that this is a virtual tunnel endpoint */
1014 static struct device_type geneve_type = {
1015 .name = "geneve",
1016 };
1017
1018 /* Calls the ndo_udp_tunnel_add of the caller in order to
1019 * supply the listening GENEVE udp ports. Callers are expected
1020 * to implement the ndo_udp_tunnel_add.
1021 */
geneve_offload_rx_ports(struct net_device * dev,bool push)1022 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1023 {
1024 struct net *net = dev_net(dev);
1025 struct geneve_net *gn = net_generic(net, geneve_net_id);
1026 struct geneve_sock *gs;
1027
1028 rcu_read_lock();
1029 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1030 if (push) {
1031 udp_tunnel_push_rx_port(dev, gs->sock,
1032 UDP_TUNNEL_TYPE_GENEVE);
1033 } else {
1034 udp_tunnel_drop_rx_port(dev, gs->sock,
1035 UDP_TUNNEL_TYPE_GENEVE);
1036 }
1037 }
1038 rcu_read_unlock();
1039 }
1040
1041 /* Initialize the device structure. */
geneve_setup(struct net_device * dev)1042 static void geneve_setup(struct net_device *dev)
1043 {
1044 ether_setup(dev);
1045
1046 dev->netdev_ops = &geneve_netdev_ops;
1047 dev->ethtool_ops = &geneve_ethtool_ops;
1048 dev->needs_free_netdev = true;
1049
1050 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1051
1052 dev->features |= NETIF_F_LLTX;
1053 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1054 dev->features |= NETIF_F_RXCSUM;
1055 dev->features |= NETIF_F_GSO_SOFTWARE;
1056
1057 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1058 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1059
1060 /* MTU range: 68 - (something less than 65535) */
1061 dev->min_mtu = ETH_MIN_MTU;
1062 /* The max_mtu calculation does not take account of GENEVE
1063 * options, to avoid excluding potentially valid
1064 * configurations. This will be further reduced by IPvX hdr size.
1065 */
1066 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1067
1068 netif_keep_dst(dev);
1069 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1070 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1071 eth_hw_addr_random(dev);
1072 }
1073
1074 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1075 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1076 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1077 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1078 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1079 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1080 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1081 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1082 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1083 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1084 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1085 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1086 };
1087
geneve_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1088 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1089 struct netlink_ext_ack *extack)
1090 {
1091 if (tb[IFLA_ADDRESS]) {
1092 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1093 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1094 "Provided link layer address is not Ethernet");
1095 return -EINVAL;
1096 }
1097
1098 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1099 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1100 "Provided Ethernet address is not unicast");
1101 return -EADDRNOTAVAIL;
1102 }
1103 }
1104
1105 if (!data) {
1106 NL_SET_ERR_MSG(extack,
1107 "Not enough attributes provided to perform the operation");
1108 return -EINVAL;
1109 }
1110
1111 if (data[IFLA_GENEVE_ID]) {
1112 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1113
1114 if (vni >= GENEVE_N_VID) {
1115 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1116 "Geneve ID must be lower than 16777216");
1117 return -ERANGE;
1118 }
1119 }
1120
1121 return 0;
1122 }
1123
geneve_find_dev(struct geneve_net * gn,const struct ip_tunnel_info * info,bool * tun_on_same_port,bool * tun_collect_md)1124 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1125 const struct ip_tunnel_info *info,
1126 bool *tun_on_same_port,
1127 bool *tun_collect_md)
1128 {
1129 struct geneve_dev *geneve, *t = NULL;
1130
1131 *tun_on_same_port = false;
1132 *tun_collect_md = false;
1133 list_for_each_entry(geneve, &gn->geneve_list, next) {
1134 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1135 *tun_collect_md = geneve->collect_md;
1136 *tun_on_same_port = true;
1137 }
1138 if (info->key.tun_id == geneve->info.key.tun_id &&
1139 info->key.tp_dst == geneve->info.key.tp_dst &&
1140 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1141 t = geneve;
1142 }
1143 return t;
1144 }
1145
is_tnl_info_zero(const struct ip_tunnel_info * info)1146 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1147 {
1148 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1149 info->key.ttl || info->key.label || info->key.tp_src ||
1150 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1151 }
1152
geneve_dst_addr_equal(struct ip_tunnel_info * a,struct ip_tunnel_info * b)1153 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1154 struct ip_tunnel_info *b)
1155 {
1156 if (ip_tunnel_info_af(a) == AF_INET)
1157 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1158 else
1159 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1160 }
1161
geneve_configure(struct net * net,struct net_device * dev,struct netlink_ext_ack * extack,const struct ip_tunnel_info * info,bool metadata,bool ipv6_rx_csum)1162 static int geneve_configure(struct net *net, struct net_device *dev,
1163 struct netlink_ext_ack *extack,
1164 const struct ip_tunnel_info *info,
1165 bool metadata, bool ipv6_rx_csum)
1166 {
1167 struct geneve_net *gn = net_generic(net, geneve_net_id);
1168 struct geneve_dev *t, *geneve = netdev_priv(dev);
1169 bool tun_collect_md, tun_on_same_port;
1170 int err, encap_len;
1171
1172 if (metadata && !is_tnl_info_zero(info)) {
1173 NL_SET_ERR_MSG(extack,
1174 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1175 return -EINVAL;
1176 }
1177
1178 geneve->net = net;
1179 geneve->dev = dev;
1180
1181 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1182 if (t)
1183 return -EBUSY;
1184
1185 /* make enough headroom for basic scenario */
1186 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1187 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1188 encap_len += sizeof(struct iphdr);
1189 dev->max_mtu -= sizeof(struct iphdr);
1190 } else {
1191 encap_len += sizeof(struct ipv6hdr);
1192 dev->max_mtu -= sizeof(struct ipv6hdr);
1193 }
1194 dev->needed_headroom = encap_len + ETH_HLEN;
1195
1196 if (metadata) {
1197 if (tun_on_same_port) {
1198 NL_SET_ERR_MSG(extack,
1199 "There can be only one externally controlled device on a destination port");
1200 return -EPERM;
1201 }
1202 } else {
1203 if (tun_collect_md) {
1204 NL_SET_ERR_MSG(extack,
1205 "There already exists an externally controlled device on this destination port");
1206 return -EPERM;
1207 }
1208 }
1209
1210 dst_cache_reset(&geneve->info.dst_cache);
1211 geneve->info = *info;
1212 geneve->collect_md = metadata;
1213 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1214
1215 err = register_netdevice(dev);
1216 if (err)
1217 return err;
1218
1219 list_add(&geneve->next, &gn->geneve_list);
1220 return 0;
1221 }
1222
init_tnl_info(struct ip_tunnel_info * info,__u16 dst_port)1223 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1224 {
1225 memset(info, 0, sizeof(*info));
1226 info->key.tp_dst = htons(dst_port);
1227 }
1228
geneve_nl2info(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack,struct ip_tunnel_info * info,bool * metadata,bool * use_udp6_rx_checksums,bool changelink)1229 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1230 struct netlink_ext_ack *extack,
1231 struct ip_tunnel_info *info, bool *metadata,
1232 bool *use_udp6_rx_checksums, bool changelink)
1233 {
1234 int attrtype;
1235
1236 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1237 NL_SET_ERR_MSG(extack,
1238 "Cannot specify both IPv4 and IPv6 Remote addresses");
1239 return -EINVAL;
1240 }
1241
1242 if (data[IFLA_GENEVE_REMOTE]) {
1243 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1244 attrtype = IFLA_GENEVE_REMOTE;
1245 goto change_notsup;
1246 }
1247
1248 info->key.u.ipv4.dst =
1249 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1250
1251 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1252 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1253 "Remote IPv4 address cannot be Multicast");
1254 return -EINVAL;
1255 }
1256 }
1257
1258 if (data[IFLA_GENEVE_REMOTE6]) {
1259 #if IS_ENABLED(CONFIG_IPV6)
1260 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1261 attrtype = IFLA_GENEVE_REMOTE6;
1262 goto change_notsup;
1263 }
1264
1265 info->mode = IP_TUNNEL_INFO_IPV6;
1266 info->key.u.ipv6.dst =
1267 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1268
1269 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1270 IPV6_ADDR_LINKLOCAL) {
1271 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1272 "Remote IPv6 address cannot be link-local");
1273 return -EINVAL;
1274 }
1275 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1276 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1277 "Remote IPv6 address cannot be Multicast");
1278 return -EINVAL;
1279 }
1280 info->key.tun_flags |= TUNNEL_CSUM;
1281 *use_udp6_rx_checksums = true;
1282 #else
1283 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1284 "IPv6 support not enabled in the kernel");
1285 return -EPFNOSUPPORT;
1286 #endif
1287 }
1288
1289 if (data[IFLA_GENEVE_ID]) {
1290 __u32 vni;
1291 __u8 tvni[3];
1292 __be64 tunid;
1293
1294 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1295 tvni[0] = (vni & 0x00ff0000) >> 16;
1296 tvni[1] = (vni & 0x0000ff00) >> 8;
1297 tvni[2] = vni & 0x000000ff;
1298
1299 tunid = vni_to_tunnel_id(tvni);
1300 if (changelink && (tunid != info->key.tun_id)) {
1301 attrtype = IFLA_GENEVE_ID;
1302 goto change_notsup;
1303 }
1304 info->key.tun_id = tunid;
1305 }
1306
1307 if (data[IFLA_GENEVE_TTL])
1308 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1309
1310 if (data[IFLA_GENEVE_TOS])
1311 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1312
1313 if (data[IFLA_GENEVE_LABEL]) {
1314 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1315 IPV6_FLOWLABEL_MASK;
1316 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1317 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1318 "Label attribute only applies for IPv6 Geneve devices");
1319 return -EINVAL;
1320 }
1321 }
1322
1323 if (data[IFLA_GENEVE_PORT]) {
1324 if (changelink) {
1325 attrtype = IFLA_GENEVE_PORT;
1326 goto change_notsup;
1327 }
1328 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1329 }
1330
1331 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1332 if (changelink) {
1333 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1334 goto change_notsup;
1335 }
1336 *metadata = true;
1337 }
1338
1339 if (data[IFLA_GENEVE_UDP_CSUM]) {
1340 if (changelink) {
1341 attrtype = IFLA_GENEVE_UDP_CSUM;
1342 goto change_notsup;
1343 }
1344 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1345 info->key.tun_flags |= TUNNEL_CSUM;
1346 }
1347
1348 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 if (changelink) {
1351 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1352 goto change_notsup;
1353 }
1354 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1355 info->key.tun_flags &= ~TUNNEL_CSUM;
1356 #else
1357 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1358 "IPv6 support not enabled in the kernel");
1359 return -EPFNOSUPPORT;
1360 #endif
1361 }
1362
1363 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1364 #if IS_ENABLED(CONFIG_IPV6)
1365 if (changelink) {
1366 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1367 goto change_notsup;
1368 }
1369 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1370 *use_udp6_rx_checksums = false;
1371 #else
1372 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1373 "IPv6 support not enabled in the kernel");
1374 return -EPFNOSUPPORT;
1375 #endif
1376 }
1377
1378 return 0;
1379 change_notsup:
1380 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1381 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1382 return -EOPNOTSUPP;
1383 }
1384
geneve_link_config(struct net_device * dev,struct ip_tunnel_info * info,struct nlattr * tb[])1385 static void geneve_link_config(struct net_device *dev,
1386 struct ip_tunnel_info *info, struct nlattr *tb[])
1387 {
1388 struct geneve_dev *geneve = netdev_priv(dev);
1389 int ldev_mtu = 0;
1390
1391 if (tb[IFLA_MTU]) {
1392 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1393 return;
1394 }
1395
1396 switch (ip_tunnel_info_af(info)) {
1397 case AF_INET: {
1398 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1399 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1400
1401 if (!IS_ERR(rt) && rt->dst.dev) {
1402 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1403 ip_rt_put(rt);
1404 }
1405 break;
1406 }
1407 #if IS_ENABLED(CONFIG_IPV6)
1408 case AF_INET6: {
1409 struct rt6_info *rt = rt6_lookup(geneve->net,
1410 &info->key.u.ipv6.dst, NULL, 0,
1411 NULL, 0);
1412
1413 if (rt && rt->dst.dev)
1414 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1415 ip6_rt_put(rt);
1416 break;
1417 }
1418 #endif
1419 }
1420
1421 if (ldev_mtu <= 0)
1422 return;
1423
1424 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1425 }
1426
geneve_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1427 static int geneve_newlink(struct net *net, struct net_device *dev,
1428 struct nlattr *tb[], struct nlattr *data[],
1429 struct netlink_ext_ack *extack)
1430 {
1431 bool use_udp6_rx_checksums = false;
1432 struct ip_tunnel_info info;
1433 bool metadata = false;
1434 int err;
1435
1436 init_tnl_info(&info, GENEVE_UDP_PORT);
1437 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1438 &use_udp6_rx_checksums, false);
1439 if (err)
1440 return err;
1441
1442 err = geneve_configure(net, dev, extack, &info, metadata,
1443 use_udp6_rx_checksums);
1444 if (err)
1445 return err;
1446
1447 geneve_link_config(dev, &info, tb);
1448
1449 return 0;
1450 }
1451
1452 /* Quiesces the geneve device data path for both TX and RX.
1453 *
1454 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1455 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1456 * to complete for the existing set of in-flight packets to be transmitted,
1457 * then we would have quiesced the transmit data path. All the future packets
1458 * will get dropped until we unquiesce the data path.
1459 *
1460 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1461 * if we set that to NULL under RCU and wait for synchronize_net() to
1462 * complete, then we would have quiesced the receive data path.
1463 */
geneve_quiesce(struct geneve_dev * geneve,struct geneve_sock ** gs4,struct geneve_sock ** gs6)1464 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1465 struct geneve_sock **gs6)
1466 {
1467 *gs4 = rtnl_dereference(geneve->sock4);
1468 rcu_assign_pointer(geneve->sock4, NULL);
1469 if (*gs4)
1470 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1471 #if IS_ENABLED(CONFIG_IPV6)
1472 *gs6 = rtnl_dereference(geneve->sock6);
1473 rcu_assign_pointer(geneve->sock6, NULL);
1474 if (*gs6)
1475 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1476 #else
1477 *gs6 = NULL;
1478 #endif
1479 synchronize_net();
1480 }
1481
1482 /* Resumes the geneve device data path for both TX and RX. */
geneve_unquiesce(struct geneve_dev * geneve,struct geneve_sock * gs4,struct geneve_sock __maybe_unused * gs6)1483 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1484 struct geneve_sock __maybe_unused *gs6)
1485 {
1486 rcu_assign_pointer(geneve->sock4, gs4);
1487 if (gs4)
1488 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1489 #if IS_ENABLED(CONFIG_IPV6)
1490 rcu_assign_pointer(geneve->sock6, gs6);
1491 if (gs6)
1492 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1493 #endif
1494 synchronize_net();
1495 }
1496
geneve_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1497 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1498 struct nlattr *data[],
1499 struct netlink_ext_ack *extack)
1500 {
1501 struct geneve_dev *geneve = netdev_priv(dev);
1502 struct geneve_sock *gs4, *gs6;
1503 struct ip_tunnel_info info;
1504 bool metadata;
1505 bool use_udp6_rx_checksums;
1506 int err;
1507
1508 /* If the geneve device is configured for metadata (or externally
1509 * controlled, for example, OVS), then nothing can be changed.
1510 */
1511 if (geneve->collect_md)
1512 return -EOPNOTSUPP;
1513
1514 /* Start with the existing info. */
1515 memcpy(&info, &geneve->info, sizeof(info));
1516 metadata = geneve->collect_md;
1517 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1518 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1519 &use_udp6_rx_checksums, true);
1520 if (err)
1521 return err;
1522
1523 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1524 dst_cache_reset(&info.dst_cache);
1525 geneve_link_config(dev, &info, tb);
1526 }
1527
1528 geneve_quiesce(geneve, &gs4, &gs6);
1529 geneve->info = info;
1530 geneve->collect_md = metadata;
1531 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1532 geneve_unquiesce(geneve, gs4, gs6);
1533
1534 return 0;
1535 }
1536
geneve_dellink(struct net_device * dev,struct list_head * head)1537 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1538 {
1539 struct geneve_dev *geneve = netdev_priv(dev);
1540
1541 list_del(&geneve->next);
1542 unregister_netdevice_queue(dev, head);
1543 }
1544
geneve_get_size(const struct net_device * dev)1545 static size_t geneve_get_size(const struct net_device *dev)
1546 {
1547 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1548 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1549 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1550 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1551 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1552 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1553 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1554 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1555 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1556 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1557 0;
1558 }
1559
geneve_fill_info(struct sk_buff * skb,const struct net_device * dev)1560 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1561 {
1562 struct geneve_dev *geneve = netdev_priv(dev);
1563 struct ip_tunnel_info *info = &geneve->info;
1564 bool metadata = geneve->collect_md;
1565 __u8 tmp_vni[3];
1566 __u32 vni;
1567
1568 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1569 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1570 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1571 goto nla_put_failure;
1572
1573 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1574 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1575 info->key.u.ipv4.dst))
1576 goto nla_put_failure;
1577 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1578 !!(info->key.tun_flags & TUNNEL_CSUM)))
1579 goto nla_put_failure;
1580
1581 #if IS_ENABLED(CONFIG_IPV6)
1582 } else if (!metadata) {
1583 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1584 &info->key.u.ipv6.dst))
1585 goto nla_put_failure;
1586 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1587 !(info->key.tun_flags & TUNNEL_CSUM)))
1588 goto nla_put_failure;
1589 #endif
1590 }
1591
1592 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1593 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1594 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1595 goto nla_put_failure;
1596
1597 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1598 goto nla_put_failure;
1599
1600 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1601 goto nla_put_failure;
1602
1603 #if IS_ENABLED(CONFIG_IPV6)
1604 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1605 !geneve->use_udp6_rx_checksums))
1606 goto nla_put_failure;
1607 #endif
1608
1609 return 0;
1610
1611 nla_put_failure:
1612 return -EMSGSIZE;
1613 }
1614
1615 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1616 .kind = "geneve",
1617 .maxtype = IFLA_GENEVE_MAX,
1618 .policy = geneve_policy,
1619 .priv_size = sizeof(struct geneve_dev),
1620 .setup = geneve_setup,
1621 .validate = geneve_validate,
1622 .newlink = geneve_newlink,
1623 .changelink = geneve_changelink,
1624 .dellink = geneve_dellink,
1625 .get_size = geneve_get_size,
1626 .fill_info = geneve_fill_info,
1627 };
1628
geneve_dev_create_fb(struct net * net,const char * name,u8 name_assign_type,u16 dst_port)1629 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1630 u8 name_assign_type, u16 dst_port)
1631 {
1632 struct nlattr *tb[IFLA_MAX + 1];
1633 struct ip_tunnel_info info;
1634 struct net_device *dev;
1635 LIST_HEAD(list_kill);
1636 int err;
1637
1638 memset(tb, 0, sizeof(tb));
1639 dev = rtnl_create_link(net, name, name_assign_type,
1640 &geneve_link_ops, tb);
1641 if (IS_ERR(dev))
1642 return dev;
1643
1644 init_tnl_info(&info, dst_port);
1645 err = geneve_configure(net, dev, NULL, &info, true, true);
1646 if (err) {
1647 free_netdev(dev);
1648 return ERR_PTR(err);
1649 }
1650
1651 /* openvswitch users expect packet sizes to be unrestricted,
1652 * so set the largest MTU we can.
1653 */
1654 err = geneve_change_mtu(dev, IP_MAX_MTU);
1655 if (err)
1656 goto err;
1657
1658 err = rtnl_configure_link(dev, NULL);
1659 if (err < 0)
1660 goto err;
1661
1662 return dev;
1663 err:
1664 geneve_dellink(dev, &list_kill);
1665 unregister_netdevice_many(&list_kill);
1666 return ERR_PTR(err);
1667 }
1668 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1669
geneve_netdevice_event(struct notifier_block * unused,unsigned long event,void * ptr)1670 static int geneve_netdevice_event(struct notifier_block *unused,
1671 unsigned long event, void *ptr)
1672 {
1673 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1674
1675 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1676 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1677 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1678 } else if (event == NETDEV_UNREGISTER) {
1679 geneve_offload_rx_ports(dev, false);
1680 } else if (event == NETDEV_REGISTER) {
1681 geneve_offload_rx_ports(dev, true);
1682 }
1683
1684 return NOTIFY_DONE;
1685 }
1686
1687 static struct notifier_block geneve_notifier_block __read_mostly = {
1688 .notifier_call = geneve_netdevice_event,
1689 };
1690
geneve_init_net(struct net * net)1691 static __net_init int geneve_init_net(struct net *net)
1692 {
1693 struct geneve_net *gn = net_generic(net, geneve_net_id);
1694
1695 INIT_LIST_HEAD(&gn->geneve_list);
1696 INIT_LIST_HEAD(&gn->sock_list);
1697 return 0;
1698 }
1699
geneve_destroy_tunnels(struct net * net,struct list_head * head)1700 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1701 {
1702 struct geneve_net *gn = net_generic(net, geneve_net_id);
1703 struct geneve_dev *geneve, *next;
1704 struct net_device *dev, *aux;
1705
1706 /* gather any geneve devices that were moved into this ns */
1707 for_each_netdev_safe(net, dev, aux)
1708 if (dev->rtnl_link_ops == &geneve_link_ops)
1709 unregister_netdevice_queue(dev, head);
1710
1711 /* now gather any other geneve devices that were created in this ns */
1712 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1713 /* If geneve->dev is in the same netns, it was already added
1714 * to the list by the previous loop.
1715 */
1716 if (!net_eq(dev_net(geneve->dev), net))
1717 unregister_netdevice_queue(geneve->dev, head);
1718 }
1719
1720 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1721 }
1722
geneve_exit_batch_net(struct list_head * net_list)1723 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1724 {
1725 struct net *net;
1726 LIST_HEAD(list);
1727
1728 rtnl_lock();
1729 list_for_each_entry(net, net_list, exit_list)
1730 geneve_destroy_tunnels(net, &list);
1731
1732 /* unregister the devices gathered above */
1733 unregister_netdevice_many(&list);
1734 rtnl_unlock();
1735 }
1736
1737 static struct pernet_operations geneve_net_ops = {
1738 .init = geneve_init_net,
1739 .exit_batch = geneve_exit_batch_net,
1740 .id = &geneve_net_id,
1741 .size = sizeof(struct geneve_net),
1742 };
1743
geneve_init_module(void)1744 static int __init geneve_init_module(void)
1745 {
1746 int rc;
1747
1748 rc = register_pernet_subsys(&geneve_net_ops);
1749 if (rc)
1750 goto out1;
1751
1752 rc = register_netdevice_notifier(&geneve_notifier_block);
1753 if (rc)
1754 goto out2;
1755
1756 rc = rtnl_link_register(&geneve_link_ops);
1757 if (rc)
1758 goto out3;
1759
1760 return 0;
1761 out3:
1762 unregister_netdevice_notifier(&geneve_notifier_block);
1763 out2:
1764 unregister_pernet_subsys(&geneve_net_ops);
1765 out1:
1766 return rc;
1767 }
1768 late_initcall(geneve_init_module);
1769
geneve_cleanup_module(void)1770 static void __exit geneve_cleanup_module(void)
1771 {
1772 rtnl_link_unregister(&geneve_link_ops);
1773 unregister_netdevice_notifier(&geneve_notifier_block);
1774 unregister_pernet_subsys(&geneve_net_ops);
1775 }
1776 module_exit(geneve_cleanup_module);
1777
1778 MODULE_LICENSE("GPL");
1779 MODULE_VERSION(GENEVE_NETDEV_VER);
1780 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1781 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1782 MODULE_ALIAS_RTNL_LINK("geneve");
1783
