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 metadata = geneve->collect_md;
640 bool ipv4, ipv6;
641 int ret = 0;
642
643 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
644 ipv4 = !ipv6 || metadata;
645 #if IS_ENABLED(CONFIG_IPV6)
646 if (ipv6) {
647 ret = geneve_sock_add(geneve, true);
648 if (ret < 0 && ret != -EAFNOSUPPORT)
649 ipv4 = false;
650 }
651 #endif
652 if (ipv4)
653 ret = geneve_sock_add(geneve, false);
654 if (ret < 0)
655 geneve_sock_release(geneve);
656
657 return ret;
658 }
659
geneve_stop(struct net_device * dev)660 static int geneve_stop(struct net_device *dev)
661 {
662 struct geneve_dev *geneve = netdev_priv(dev);
663
664 hlist_del_init_rcu(&geneve->hlist4.hlist);
665 #if IS_ENABLED(CONFIG_IPV6)
666 hlist_del_init_rcu(&geneve->hlist6.hlist);
667 #endif
668 geneve_sock_release(geneve);
669 return 0;
670 }
671
geneve_build_header(struct genevehdr * geneveh,const struct ip_tunnel_info * info)672 static void geneve_build_header(struct genevehdr *geneveh,
673 const struct ip_tunnel_info *info)
674 {
675 geneveh->ver = GENEVE_VER;
676 geneveh->opt_len = info->options_len / 4;
677 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
678 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
679 geneveh->rsvd1 = 0;
680 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
681 geneveh->proto_type = htons(ETH_P_TEB);
682 geneveh->rsvd2 = 0;
683
684 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
685 ip_tunnel_info_opts_get(geneveh->options, info);
686 }
687
geneve_build_skb(struct dst_entry * dst,struct sk_buff * skb,const struct ip_tunnel_info * info,bool xnet,int ip_hdr_len)688 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
689 const struct ip_tunnel_info *info,
690 bool xnet, int ip_hdr_len)
691 {
692 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
693 struct genevehdr *gnvh;
694 int min_headroom;
695 int err;
696
697 skb_reset_mac_header(skb);
698 skb_scrub_packet(skb, xnet);
699
700 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
701 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
702 err = skb_cow_head(skb, min_headroom);
703 if (unlikely(err))
704 goto free_dst;
705
706 err = udp_tunnel_handle_offloads(skb, udp_sum);
707 if (err)
708 goto free_dst;
709
710 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
711 geneve_build_header(gnvh, info);
712 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
713 return 0;
714
715 free_dst:
716 dst_release(dst);
717 return err;
718 }
719
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,__be16 dport,__be16 sport)720 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
721 struct net_device *dev,
722 struct geneve_sock *gs4,
723 struct flowi4 *fl4,
724 const struct ip_tunnel_info *info,
725 __be16 dport, __be16 sport)
726 {
727 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
728 struct geneve_dev *geneve = netdev_priv(dev);
729 struct dst_cache *dst_cache;
730 struct rtable *rt = NULL;
731 __u8 tos;
732
733 if (!gs4)
734 return ERR_PTR(-EIO);
735
736 memset(fl4, 0, sizeof(*fl4));
737 fl4->flowi4_mark = skb->mark;
738 fl4->flowi4_proto = IPPROTO_UDP;
739 fl4->daddr = info->key.u.ipv4.dst;
740 fl4->saddr = info->key.u.ipv4.src;
741 fl4->fl4_dport = dport;
742 fl4->fl4_sport = sport;
743
744 tos = info->key.tos;
745 if ((tos == 1) && !geneve->collect_md) {
746 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
747 use_cache = false;
748 }
749 fl4->flowi4_tos = RT_TOS(tos);
750
751 dst_cache = (struct dst_cache *)&info->dst_cache;
752 if (use_cache) {
753 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
754 if (rt)
755 return rt;
756 }
757 rt = ip_route_output_key(geneve->net, fl4);
758 if (IS_ERR(rt)) {
759 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
760 return ERR_PTR(-ENETUNREACH);
761 }
762 if (rt->dst.dev == dev) { /* is this necessary? */
763 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
764 ip_rt_put(rt);
765 return ERR_PTR(-ELOOP);
766 }
767 if (use_cache)
768 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
769 return rt;
770 }
771
772 #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,__be16 dport,__be16 sport)773 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
774 struct net_device *dev,
775 struct geneve_sock *gs6,
776 struct flowi6 *fl6,
777 const struct ip_tunnel_info *info,
778 __be16 dport, __be16 sport)
779 {
780 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
781 struct geneve_dev *geneve = netdev_priv(dev);
782 struct dst_entry *dst = NULL;
783 struct dst_cache *dst_cache;
784 __u8 prio;
785
786 if (!gs6)
787 return ERR_PTR(-EIO);
788
789 memset(fl6, 0, sizeof(*fl6));
790 fl6->flowi6_mark = skb->mark;
791 fl6->flowi6_proto = IPPROTO_UDP;
792 fl6->daddr = info->key.u.ipv6.dst;
793 fl6->saddr = info->key.u.ipv6.src;
794 fl6->fl6_dport = dport;
795 fl6->fl6_sport = sport;
796
797 prio = info->key.tos;
798 if ((prio == 1) && !geneve->collect_md) {
799 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
800 use_cache = false;
801 }
802
803 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
804 info->key.label);
805 dst_cache = (struct dst_cache *)&info->dst_cache;
806 if (use_cache) {
807 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
808 if (dst)
809 return dst;
810 }
811 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
812 NULL);
813 if (IS_ERR(dst)) {
814 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
815 return ERR_PTR(-ENETUNREACH);
816 }
817 if (dst->dev == dev) { /* is this necessary? */
818 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
819 dst_release(dst);
820 return ERR_PTR(-ELOOP);
821 }
822
823 if (use_cache)
824 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
825 return dst;
826 }
827 #endif
828
geneve_xmit_skb(struct sk_buff * skb,struct net_device * dev,struct geneve_dev * geneve,const struct ip_tunnel_info * info)829 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
830 struct geneve_dev *geneve,
831 const struct ip_tunnel_info *info)
832 {
833 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
834 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
835 const struct ip_tunnel_key *key = &info->key;
836 struct rtable *rt;
837 struct flowi4 fl4;
838 __u8 tos, ttl;
839 __be16 sport;
840 __be16 df;
841 int err;
842
843 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
844 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
845 geneve->info.key.tp_dst, sport);
846 if (IS_ERR(rt))
847 return PTR_ERR(rt);
848
849 skb_tunnel_check_pmtu(skb, &rt->dst,
850 GENEVE_IPV4_HLEN + info->options_len);
851
852 if (geneve->collect_md) {
853 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
854 ttl = key->ttl;
855 } else {
856 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
857 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
858 }
859 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
860
861 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
862 if (unlikely(err))
863 return err;
864
865 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
866 tos, ttl, df, sport, geneve->info.key.tp_dst,
867 !net_eq(geneve->net, dev_net(geneve->dev)),
868 !(info->key.tun_flags & TUNNEL_CSUM));
869 return 0;
870 }
871
872 #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)873 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
874 struct geneve_dev *geneve,
875 const struct ip_tunnel_info *info)
876 {
877 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
878 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
879 const struct ip_tunnel_key *key = &info->key;
880 struct dst_entry *dst = NULL;
881 struct flowi6 fl6;
882 __u8 prio, ttl;
883 __be16 sport;
884 int err;
885
886 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
887 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
888 geneve->info.key.tp_dst, sport);
889 if (IS_ERR(dst))
890 return PTR_ERR(dst);
891
892 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
893
894 if (geneve->collect_md) {
895 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
896 ttl = key->ttl;
897 } else {
898 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
899 ip_hdr(skb), skb);
900 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
901 }
902 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
903 if (unlikely(err))
904 return err;
905
906 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
907 &fl6.saddr, &fl6.daddr, prio, ttl,
908 info->key.label, sport, geneve->info.key.tp_dst,
909 !(info->key.tun_flags & TUNNEL_CSUM));
910 return 0;
911 }
912 #endif
913
geneve_xmit(struct sk_buff * skb,struct net_device * dev)914 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
915 {
916 struct geneve_dev *geneve = netdev_priv(dev);
917 struct ip_tunnel_info *info = NULL;
918 int err;
919
920 if (geneve->collect_md) {
921 info = skb_tunnel_info(skb);
922 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
923 netdev_dbg(dev, "no tunnel metadata\n");
924 dev_kfree_skb(skb);
925 dev->stats.tx_dropped++;
926 return NETDEV_TX_OK;
927 }
928 } else {
929 info = &geneve->info;
930 }
931
932 rcu_read_lock();
933 #if IS_ENABLED(CONFIG_IPV6)
934 if (info->mode & IP_TUNNEL_INFO_IPV6)
935 err = geneve6_xmit_skb(skb, dev, geneve, info);
936 else
937 #endif
938 err = geneve_xmit_skb(skb, dev, geneve, info);
939 rcu_read_unlock();
940
941 if (likely(!err))
942 return NETDEV_TX_OK;
943
944 dev_kfree_skb(skb);
945
946 if (err == -ELOOP)
947 dev->stats.collisions++;
948 else if (err == -ENETUNREACH)
949 dev->stats.tx_carrier_errors++;
950
951 dev->stats.tx_errors++;
952 return NETDEV_TX_OK;
953 }
954
geneve_change_mtu(struct net_device * dev,int new_mtu)955 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
956 {
957 if (new_mtu > dev->max_mtu)
958 new_mtu = dev->max_mtu;
959 else if (new_mtu < dev->min_mtu)
960 new_mtu = dev->min_mtu;
961
962 dev->mtu = new_mtu;
963 return 0;
964 }
965
geneve_fill_metadata_dst(struct net_device * dev,struct sk_buff * skb)966 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
967 {
968 struct ip_tunnel_info *info = skb_tunnel_info(skb);
969 struct geneve_dev *geneve = netdev_priv(dev);
970 __be16 sport;
971
972 if (ip_tunnel_info_af(info) == AF_INET) {
973 struct rtable *rt;
974 struct flowi4 fl4;
975
976 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
977 sport = udp_flow_src_port(geneve->net, skb,
978 1, USHRT_MAX, true);
979
980 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
981 geneve->info.key.tp_dst, sport);
982 if (IS_ERR(rt))
983 return PTR_ERR(rt);
984
985 ip_rt_put(rt);
986 info->key.u.ipv4.src = fl4.saddr;
987 #if IS_ENABLED(CONFIG_IPV6)
988 } else if (ip_tunnel_info_af(info) == AF_INET6) {
989 struct dst_entry *dst;
990 struct flowi6 fl6;
991
992 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
993 sport = udp_flow_src_port(geneve->net, skb,
994 1, USHRT_MAX, true);
995
996 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
997 geneve->info.key.tp_dst, sport);
998 if (IS_ERR(dst))
999 return PTR_ERR(dst);
1000
1001 dst_release(dst);
1002 info->key.u.ipv6.src = fl6.saddr;
1003 #endif
1004 } else {
1005 return -EINVAL;
1006 }
1007
1008 info->key.tp_src = sport;
1009 info->key.tp_dst = geneve->info.key.tp_dst;
1010 return 0;
1011 }
1012
1013 static const struct net_device_ops geneve_netdev_ops = {
1014 .ndo_init = geneve_init,
1015 .ndo_uninit = geneve_uninit,
1016 .ndo_open = geneve_open,
1017 .ndo_stop = geneve_stop,
1018 .ndo_start_xmit = geneve_xmit,
1019 .ndo_get_stats64 = ip_tunnel_get_stats64,
1020 .ndo_change_mtu = geneve_change_mtu,
1021 .ndo_validate_addr = eth_validate_addr,
1022 .ndo_set_mac_address = eth_mac_addr,
1023 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1024 };
1025
geneve_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * drvinfo)1026 static void geneve_get_drvinfo(struct net_device *dev,
1027 struct ethtool_drvinfo *drvinfo)
1028 {
1029 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1030 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1031 }
1032
1033 static const struct ethtool_ops geneve_ethtool_ops = {
1034 .get_drvinfo = geneve_get_drvinfo,
1035 .get_link = ethtool_op_get_link,
1036 };
1037
1038 /* Info for udev, that this is a virtual tunnel endpoint */
1039 static struct device_type geneve_type = {
1040 .name = "geneve",
1041 };
1042
1043 /* Calls the ndo_udp_tunnel_add of the caller in order to
1044 * supply the listening GENEVE udp ports. Callers are expected
1045 * to implement the ndo_udp_tunnel_add.
1046 */
geneve_offload_rx_ports(struct net_device * dev,bool push)1047 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1048 {
1049 struct net *net = dev_net(dev);
1050 struct geneve_net *gn = net_generic(net, geneve_net_id);
1051 struct geneve_sock *gs;
1052
1053 rcu_read_lock();
1054 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1055 if (push) {
1056 udp_tunnel_push_rx_port(dev, gs->sock,
1057 UDP_TUNNEL_TYPE_GENEVE);
1058 } else {
1059 udp_tunnel_drop_rx_port(dev, gs->sock,
1060 UDP_TUNNEL_TYPE_GENEVE);
1061 }
1062 }
1063 rcu_read_unlock();
1064 }
1065
1066 /* Initialize the device structure. */
geneve_setup(struct net_device * dev)1067 static void geneve_setup(struct net_device *dev)
1068 {
1069 ether_setup(dev);
1070
1071 dev->netdev_ops = &geneve_netdev_ops;
1072 dev->ethtool_ops = &geneve_ethtool_ops;
1073 dev->needs_free_netdev = true;
1074
1075 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1076
1077 dev->features |= NETIF_F_LLTX;
1078 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1079 dev->features |= NETIF_F_RXCSUM;
1080 dev->features |= NETIF_F_GSO_SOFTWARE;
1081
1082 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1083 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1084
1085 /* MTU range: 68 - (something less than 65535) */
1086 dev->min_mtu = ETH_MIN_MTU;
1087 /* The max_mtu calculation does not take account of GENEVE
1088 * options, to avoid excluding potentially valid
1089 * configurations. This will be further reduced by IPvX hdr size.
1090 */
1091 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1092
1093 netif_keep_dst(dev);
1094 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1095 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1096 eth_hw_addr_random(dev);
1097 }
1098
1099 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1100 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1101 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1102 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1103 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1104 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1105 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1106 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1107 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1108 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1109 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1110 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1111 };
1112
geneve_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1113 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1114 struct netlink_ext_ack *extack)
1115 {
1116 if (tb[IFLA_ADDRESS]) {
1117 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1118 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1119 "Provided link layer address is not Ethernet");
1120 return -EINVAL;
1121 }
1122
1123 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1124 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1125 "Provided Ethernet address is not unicast");
1126 return -EADDRNOTAVAIL;
1127 }
1128 }
1129
1130 if (!data) {
1131 NL_SET_ERR_MSG(extack,
1132 "Not enough attributes provided to perform the operation");
1133 return -EINVAL;
1134 }
1135
1136 if (data[IFLA_GENEVE_ID]) {
1137 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1138
1139 if (vni >= GENEVE_N_VID) {
1140 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1141 "Geneve ID must be lower than 16777216");
1142 return -ERANGE;
1143 }
1144 }
1145
1146 return 0;
1147 }
1148
geneve_find_dev(struct geneve_net * gn,const struct ip_tunnel_info * info,bool * tun_on_same_port,bool * tun_collect_md)1149 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1150 const struct ip_tunnel_info *info,
1151 bool *tun_on_same_port,
1152 bool *tun_collect_md)
1153 {
1154 struct geneve_dev *geneve, *t = NULL;
1155
1156 *tun_on_same_port = false;
1157 *tun_collect_md = false;
1158 list_for_each_entry(geneve, &gn->geneve_list, next) {
1159 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1160 *tun_collect_md = geneve->collect_md;
1161 *tun_on_same_port = true;
1162 }
1163 if (info->key.tun_id == geneve->info.key.tun_id &&
1164 info->key.tp_dst == geneve->info.key.tp_dst &&
1165 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1166 t = geneve;
1167 }
1168 return t;
1169 }
1170
is_tnl_info_zero(const struct ip_tunnel_info * info)1171 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1172 {
1173 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1174 info->key.ttl || info->key.label || info->key.tp_src ||
1175 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1176 }
1177
geneve_dst_addr_equal(struct ip_tunnel_info * a,struct ip_tunnel_info * b)1178 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1179 struct ip_tunnel_info *b)
1180 {
1181 if (ip_tunnel_info_af(a) == AF_INET)
1182 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1183 else
1184 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1185 }
1186
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)1187 static int geneve_configure(struct net *net, struct net_device *dev,
1188 struct netlink_ext_ack *extack,
1189 const struct ip_tunnel_info *info,
1190 bool metadata, bool ipv6_rx_csum)
1191 {
1192 struct geneve_net *gn = net_generic(net, geneve_net_id);
1193 struct geneve_dev *t, *geneve = netdev_priv(dev);
1194 bool tun_collect_md, tun_on_same_port;
1195 int err, encap_len;
1196
1197 if (metadata && !is_tnl_info_zero(info)) {
1198 NL_SET_ERR_MSG(extack,
1199 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1200 return -EINVAL;
1201 }
1202
1203 geneve->net = net;
1204 geneve->dev = dev;
1205
1206 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1207 if (t)
1208 return -EBUSY;
1209
1210 /* make enough headroom for basic scenario */
1211 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1212 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1213 encap_len += sizeof(struct iphdr);
1214 dev->max_mtu -= sizeof(struct iphdr);
1215 } else {
1216 encap_len += sizeof(struct ipv6hdr);
1217 dev->max_mtu -= sizeof(struct ipv6hdr);
1218 }
1219 dev->needed_headroom = encap_len + ETH_HLEN;
1220
1221 if (metadata) {
1222 if (tun_on_same_port) {
1223 NL_SET_ERR_MSG(extack,
1224 "There can be only one externally controlled device on a destination port");
1225 return -EPERM;
1226 }
1227 } else {
1228 if (tun_collect_md) {
1229 NL_SET_ERR_MSG(extack,
1230 "There already exists an externally controlled device on this destination port");
1231 return -EPERM;
1232 }
1233 }
1234
1235 dst_cache_reset(&geneve->info.dst_cache);
1236 geneve->info = *info;
1237 geneve->collect_md = metadata;
1238 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1239
1240 err = register_netdevice(dev);
1241 if (err)
1242 return err;
1243
1244 list_add(&geneve->next, &gn->geneve_list);
1245 return 0;
1246 }
1247
init_tnl_info(struct ip_tunnel_info * info,__u16 dst_port)1248 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1249 {
1250 memset(info, 0, sizeof(*info));
1251 info->key.tp_dst = htons(dst_port);
1252 }
1253
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)1254 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1255 struct netlink_ext_ack *extack,
1256 struct ip_tunnel_info *info, bool *metadata,
1257 bool *use_udp6_rx_checksums, bool changelink)
1258 {
1259 int attrtype;
1260
1261 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1262 NL_SET_ERR_MSG(extack,
1263 "Cannot specify both IPv4 and IPv6 Remote addresses");
1264 return -EINVAL;
1265 }
1266
1267 if (data[IFLA_GENEVE_REMOTE]) {
1268 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1269 attrtype = IFLA_GENEVE_REMOTE;
1270 goto change_notsup;
1271 }
1272
1273 info->key.u.ipv4.dst =
1274 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1275
1276 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1277 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1278 "Remote IPv4 address cannot be Multicast");
1279 return -EINVAL;
1280 }
1281 }
1282
1283 if (data[IFLA_GENEVE_REMOTE6]) {
1284 #if IS_ENABLED(CONFIG_IPV6)
1285 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1286 attrtype = IFLA_GENEVE_REMOTE6;
1287 goto change_notsup;
1288 }
1289
1290 info->mode = IP_TUNNEL_INFO_IPV6;
1291 info->key.u.ipv6.dst =
1292 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1293
1294 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1295 IPV6_ADDR_LINKLOCAL) {
1296 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1297 "Remote IPv6 address cannot be link-local");
1298 return -EINVAL;
1299 }
1300 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1301 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1302 "Remote IPv6 address cannot be Multicast");
1303 return -EINVAL;
1304 }
1305 info->key.tun_flags |= TUNNEL_CSUM;
1306 *use_udp6_rx_checksums = true;
1307 #else
1308 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1309 "IPv6 support not enabled in the kernel");
1310 return -EPFNOSUPPORT;
1311 #endif
1312 }
1313
1314 if (data[IFLA_GENEVE_ID]) {
1315 __u32 vni;
1316 __u8 tvni[3];
1317 __be64 tunid;
1318
1319 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1320 tvni[0] = (vni & 0x00ff0000) >> 16;
1321 tvni[1] = (vni & 0x0000ff00) >> 8;
1322 tvni[2] = vni & 0x000000ff;
1323
1324 tunid = vni_to_tunnel_id(tvni);
1325 if (changelink && (tunid != info->key.tun_id)) {
1326 attrtype = IFLA_GENEVE_ID;
1327 goto change_notsup;
1328 }
1329 info->key.tun_id = tunid;
1330 }
1331
1332 if (data[IFLA_GENEVE_TTL])
1333 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1334
1335 if (data[IFLA_GENEVE_TOS])
1336 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1337
1338 if (data[IFLA_GENEVE_LABEL]) {
1339 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1340 IPV6_FLOWLABEL_MASK;
1341 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1342 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1343 "Label attribute only applies for IPv6 Geneve devices");
1344 return -EINVAL;
1345 }
1346 }
1347
1348 if (data[IFLA_GENEVE_PORT]) {
1349 if (changelink) {
1350 attrtype = IFLA_GENEVE_PORT;
1351 goto change_notsup;
1352 }
1353 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1354 }
1355
1356 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1357 if (changelink) {
1358 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1359 goto change_notsup;
1360 }
1361 *metadata = true;
1362 }
1363
1364 if (data[IFLA_GENEVE_UDP_CSUM]) {
1365 if (changelink) {
1366 attrtype = IFLA_GENEVE_UDP_CSUM;
1367 goto change_notsup;
1368 }
1369 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1370 info->key.tun_flags |= TUNNEL_CSUM;
1371 }
1372
1373 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1374 #if IS_ENABLED(CONFIG_IPV6)
1375 if (changelink) {
1376 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1377 goto change_notsup;
1378 }
1379 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1380 info->key.tun_flags &= ~TUNNEL_CSUM;
1381 #else
1382 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1383 "IPv6 support not enabled in the kernel");
1384 return -EPFNOSUPPORT;
1385 #endif
1386 }
1387
1388 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1389 #if IS_ENABLED(CONFIG_IPV6)
1390 if (changelink) {
1391 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1392 goto change_notsup;
1393 }
1394 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1395 *use_udp6_rx_checksums = false;
1396 #else
1397 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1398 "IPv6 support not enabled in the kernel");
1399 return -EPFNOSUPPORT;
1400 #endif
1401 }
1402
1403 return 0;
1404 change_notsup:
1405 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1406 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1407 return -EOPNOTSUPP;
1408 }
1409
geneve_link_config(struct net_device * dev,struct ip_tunnel_info * info,struct nlattr * tb[])1410 static void geneve_link_config(struct net_device *dev,
1411 struct ip_tunnel_info *info, struct nlattr *tb[])
1412 {
1413 struct geneve_dev *geneve = netdev_priv(dev);
1414 int ldev_mtu = 0;
1415
1416 if (tb[IFLA_MTU]) {
1417 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1418 return;
1419 }
1420
1421 switch (ip_tunnel_info_af(info)) {
1422 case AF_INET: {
1423 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1424 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1425
1426 if (!IS_ERR(rt) && rt->dst.dev) {
1427 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1428 ip_rt_put(rt);
1429 }
1430 break;
1431 }
1432 #if IS_ENABLED(CONFIG_IPV6)
1433 case AF_INET6: {
1434 struct rt6_info *rt;
1435
1436 if (!__in6_dev_get(dev))
1437 break;
1438
1439 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1440 NULL, 0);
1441
1442 if (rt && rt->dst.dev)
1443 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1444 ip6_rt_put(rt);
1445 break;
1446 }
1447 #endif
1448 }
1449
1450 if (ldev_mtu <= 0)
1451 return;
1452
1453 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1454 }
1455
geneve_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1456 static int geneve_newlink(struct net *net, struct net_device *dev,
1457 struct nlattr *tb[], struct nlattr *data[],
1458 struct netlink_ext_ack *extack)
1459 {
1460 bool use_udp6_rx_checksums = false;
1461 struct ip_tunnel_info info;
1462 bool metadata = false;
1463 int err;
1464
1465 init_tnl_info(&info, GENEVE_UDP_PORT);
1466 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1467 &use_udp6_rx_checksums, false);
1468 if (err)
1469 return err;
1470
1471 err = geneve_configure(net, dev, extack, &info, metadata,
1472 use_udp6_rx_checksums);
1473 if (err)
1474 return err;
1475
1476 geneve_link_config(dev, &info, tb);
1477
1478 return 0;
1479 }
1480
1481 /* Quiesces the geneve device data path for both TX and RX.
1482 *
1483 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1484 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1485 * to complete for the existing set of in-flight packets to be transmitted,
1486 * then we would have quiesced the transmit data path. All the future packets
1487 * will get dropped until we unquiesce the data path.
1488 *
1489 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1490 * if we set that to NULL under RCU and wait for synchronize_net() to
1491 * complete, then we would have quiesced the receive data path.
1492 */
geneve_quiesce(struct geneve_dev * geneve,struct geneve_sock ** gs4,struct geneve_sock ** gs6)1493 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1494 struct geneve_sock **gs6)
1495 {
1496 *gs4 = rtnl_dereference(geneve->sock4);
1497 rcu_assign_pointer(geneve->sock4, NULL);
1498 if (*gs4)
1499 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1500 #if IS_ENABLED(CONFIG_IPV6)
1501 *gs6 = rtnl_dereference(geneve->sock6);
1502 rcu_assign_pointer(geneve->sock6, NULL);
1503 if (*gs6)
1504 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1505 #else
1506 *gs6 = NULL;
1507 #endif
1508 synchronize_net();
1509 }
1510
1511 /* 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)1512 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1513 struct geneve_sock __maybe_unused *gs6)
1514 {
1515 rcu_assign_pointer(geneve->sock4, gs4);
1516 if (gs4)
1517 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1518 #if IS_ENABLED(CONFIG_IPV6)
1519 rcu_assign_pointer(geneve->sock6, gs6);
1520 if (gs6)
1521 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1522 #endif
1523 synchronize_net();
1524 }
1525
geneve_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1526 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1527 struct nlattr *data[],
1528 struct netlink_ext_ack *extack)
1529 {
1530 struct geneve_dev *geneve = netdev_priv(dev);
1531 struct geneve_sock *gs4, *gs6;
1532 struct ip_tunnel_info info;
1533 bool metadata;
1534 bool use_udp6_rx_checksums;
1535 int err;
1536
1537 /* If the geneve device is configured for metadata (or externally
1538 * controlled, for example, OVS), then nothing can be changed.
1539 */
1540 if (geneve->collect_md)
1541 return -EOPNOTSUPP;
1542
1543 /* Start with the existing info. */
1544 memcpy(&info, &geneve->info, sizeof(info));
1545 metadata = geneve->collect_md;
1546 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1547 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1548 &use_udp6_rx_checksums, true);
1549 if (err)
1550 return err;
1551
1552 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1553 dst_cache_reset(&info.dst_cache);
1554 geneve_link_config(dev, &info, tb);
1555 }
1556
1557 geneve_quiesce(geneve, &gs4, &gs6);
1558 geneve->info = info;
1559 geneve->collect_md = metadata;
1560 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1561 geneve_unquiesce(geneve, gs4, gs6);
1562
1563 return 0;
1564 }
1565
geneve_dellink(struct net_device * dev,struct list_head * head)1566 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1567 {
1568 struct geneve_dev *geneve = netdev_priv(dev);
1569
1570 list_del(&geneve->next);
1571 unregister_netdevice_queue(dev, head);
1572 }
1573
geneve_get_size(const struct net_device * dev)1574 static size_t geneve_get_size(const struct net_device *dev)
1575 {
1576 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1577 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1578 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1579 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1580 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1581 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1582 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1583 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1584 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1585 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1586 0;
1587 }
1588
geneve_fill_info(struct sk_buff * skb,const struct net_device * dev)1589 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1590 {
1591 struct geneve_dev *geneve = netdev_priv(dev);
1592 struct ip_tunnel_info *info = &geneve->info;
1593 bool metadata = geneve->collect_md;
1594 __u8 tmp_vni[3];
1595 __u32 vni;
1596
1597 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1598 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1599 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1600 goto nla_put_failure;
1601
1602 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1603 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1604 info->key.u.ipv4.dst))
1605 goto nla_put_failure;
1606 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1607 !!(info->key.tun_flags & TUNNEL_CSUM)))
1608 goto nla_put_failure;
1609
1610 #if IS_ENABLED(CONFIG_IPV6)
1611 } else if (!metadata) {
1612 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1613 &info->key.u.ipv6.dst))
1614 goto nla_put_failure;
1615 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1616 !(info->key.tun_flags & TUNNEL_CSUM)))
1617 goto nla_put_failure;
1618 #endif
1619 }
1620
1621 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1622 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1623 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1624 goto nla_put_failure;
1625
1626 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1627 goto nla_put_failure;
1628
1629 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1630 goto nla_put_failure;
1631
1632 #if IS_ENABLED(CONFIG_IPV6)
1633 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1634 !geneve->use_udp6_rx_checksums))
1635 goto nla_put_failure;
1636 #endif
1637
1638 return 0;
1639
1640 nla_put_failure:
1641 return -EMSGSIZE;
1642 }
1643
1644 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1645 .kind = "geneve",
1646 .maxtype = IFLA_GENEVE_MAX,
1647 .policy = geneve_policy,
1648 .priv_size = sizeof(struct geneve_dev),
1649 .setup = geneve_setup,
1650 .validate = geneve_validate,
1651 .newlink = geneve_newlink,
1652 .changelink = geneve_changelink,
1653 .dellink = geneve_dellink,
1654 .get_size = geneve_get_size,
1655 .fill_info = geneve_fill_info,
1656 };
1657
geneve_dev_create_fb(struct net * net,const char * name,u8 name_assign_type,u16 dst_port)1658 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1659 u8 name_assign_type, u16 dst_port)
1660 {
1661 struct nlattr *tb[IFLA_MAX + 1];
1662 struct ip_tunnel_info info;
1663 struct net_device *dev;
1664 LIST_HEAD(list_kill);
1665 int err;
1666
1667 memset(tb, 0, sizeof(tb));
1668 dev = rtnl_create_link(net, name, name_assign_type,
1669 &geneve_link_ops, tb);
1670 if (IS_ERR(dev))
1671 return dev;
1672
1673 init_tnl_info(&info, dst_port);
1674 err = geneve_configure(net, dev, NULL, &info, true, true);
1675 if (err) {
1676 free_netdev(dev);
1677 return ERR_PTR(err);
1678 }
1679
1680 /* openvswitch users expect packet sizes to be unrestricted,
1681 * so set the largest MTU we can.
1682 */
1683 err = geneve_change_mtu(dev, IP_MAX_MTU);
1684 if (err)
1685 goto err;
1686
1687 err = rtnl_configure_link(dev, NULL);
1688 if (err < 0)
1689 goto err;
1690
1691 return dev;
1692 err:
1693 geneve_dellink(dev, &list_kill);
1694 unregister_netdevice_many(&list_kill);
1695 return ERR_PTR(err);
1696 }
1697 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1698
geneve_netdevice_event(struct notifier_block * unused,unsigned long event,void * ptr)1699 static int geneve_netdevice_event(struct notifier_block *unused,
1700 unsigned long event, void *ptr)
1701 {
1702 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1703
1704 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1705 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1706 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1707 } else if (event == NETDEV_UNREGISTER) {
1708 geneve_offload_rx_ports(dev, false);
1709 } else if (event == NETDEV_REGISTER) {
1710 geneve_offload_rx_ports(dev, true);
1711 }
1712
1713 return NOTIFY_DONE;
1714 }
1715
1716 static struct notifier_block geneve_notifier_block __read_mostly = {
1717 .notifier_call = geneve_netdevice_event,
1718 };
1719
geneve_init_net(struct net * net)1720 static __net_init int geneve_init_net(struct net *net)
1721 {
1722 struct geneve_net *gn = net_generic(net, geneve_net_id);
1723
1724 INIT_LIST_HEAD(&gn->geneve_list);
1725 INIT_LIST_HEAD(&gn->sock_list);
1726 return 0;
1727 }
1728
geneve_destroy_tunnels(struct net * net,struct list_head * head)1729 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1730 {
1731 struct geneve_net *gn = net_generic(net, geneve_net_id);
1732 struct geneve_dev *geneve, *next;
1733 struct net_device *dev, *aux;
1734
1735 /* gather any geneve devices that were moved into this ns */
1736 for_each_netdev_safe(net, dev, aux)
1737 if (dev->rtnl_link_ops == &geneve_link_ops)
1738 unregister_netdevice_queue(dev, head);
1739
1740 /* now gather any other geneve devices that were created in this ns */
1741 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1742 /* If geneve->dev is in the same netns, it was already added
1743 * to the list by the previous loop.
1744 */
1745 if (!net_eq(dev_net(geneve->dev), net))
1746 unregister_netdevice_queue(geneve->dev, head);
1747 }
1748 }
1749
geneve_exit_batch_net(struct list_head * net_list)1750 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1751 {
1752 struct net *net;
1753 LIST_HEAD(list);
1754
1755 rtnl_lock();
1756 list_for_each_entry(net, net_list, exit_list)
1757 geneve_destroy_tunnels(net, &list);
1758
1759 /* unregister the devices gathered above */
1760 unregister_netdevice_many(&list);
1761 rtnl_unlock();
1762
1763 list_for_each_entry(net, net_list, exit_list) {
1764 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1765
1766 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1767 }
1768 }
1769
1770 static struct pernet_operations geneve_net_ops = {
1771 .init = geneve_init_net,
1772 .exit_batch = geneve_exit_batch_net,
1773 .id = &geneve_net_id,
1774 .size = sizeof(struct geneve_net),
1775 };
1776
geneve_init_module(void)1777 static int __init geneve_init_module(void)
1778 {
1779 int rc;
1780
1781 rc = register_pernet_subsys(&geneve_net_ops);
1782 if (rc)
1783 goto out1;
1784
1785 rc = register_netdevice_notifier(&geneve_notifier_block);
1786 if (rc)
1787 goto out2;
1788
1789 rc = rtnl_link_register(&geneve_link_ops);
1790 if (rc)
1791 goto out3;
1792
1793 return 0;
1794 out3:
1795 unregister_netdevice_notifier(&geneve_notifier_block);
1796 out2:
1797 unregister_pernet_subsys(&geneve_net_ops);
1798 out1:
1799 return rc;
1800 }
1801 late_initcall(geneve_init_module);
1802
geneve_cleanup_module(void)1803 static void __exit geneve_cleanup_module(void)
1804 {
1805 rtnl_link_unregister(&geneve_link_ops);
1806 unregister_netdevice_notifier(&geneve_notifier_block);
1807 unregister_pernet_subsys(&geneve_net_ops);
1808 }
1809 module_exit(geneve_cleanup_module);
1810
1811 MODULE_LICENSE("GPL");
1812 MODULE_VERSION(GENEVE_NETDEV_VER);
1813 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1814 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1815 MODULE_ALIAS_RTNL_LINK("geneve");
1816