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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GENEVE: Generic Network Virtualization Encapsulation
4 *
5 * Copyright (c) 2015 Red Hat, Inc.
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/ethtool.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/etherdevice.h>
14#include <linux/hash.h>
15#include <net/ipv6_stubs.h>
16#include <net/dst_metadata.h>
17#include <net/gro_cells.h>
18#include <net/rtnetlink.h>
19#include <net/geneve.h>
20#include <net/gro.h>
21#include <net/protocol.h>
22
23#define GENEVE_NETDEV_VER "0.6"
24
25#define GENEVE_N_VID (1u << 24)
26#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
27
28#define VNI_HASH_BITS 10
29#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
30
31static bool log_ecn_error = true;
32module_param(log_ecn_error, bool, 0644);
33MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
34
35#define GENEVE_VER 0
36#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
37#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
38#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
39
40/* per-network namespace private data for this module */
41struct geneve_net {
42 struct list_head geneve_list;
43 struct list_head sock_list;
44};
45
46static unsigned int geneve_net_id;
47
48struct geneve_dev_node {
49 struct hlist_node hlist;
50 struct geneve_dev *geneve;
51};
52
53struct geneve_config {
54 struct ip_tunnel_info info;
55 bool collect_md;
56 bool use_udp6_rx_checksums;
57 bool ttl_inherit;
58 enum ifla_geneve_df df;
59 bool inner_proto_inherit;
60};
61
62/* Pseudo network device */
63struct geneve_dev {
64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
65#if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
67#endif
68 struct net *net; /* netns for packet i/o */
69 struct net_device *dev; /* netdev for geneve tunnel */
70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
71#if IS_ENABLED(CONFIG_IPV6)
72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
73#endif
74 struct list_head next; /* geneve's per namespace list */
75 struct gro_cells gro_cells;
76 struct geneve_config cfg;
77};
78
79struct geneve_sock {
80 bool collect_md;
81 struct list_head list;
82 struct socket *sock;
83 struct rcu_head rcu;
84 int refcnt;
85 struct hlist_head vni_list[VNI_HASH_SIZE];
86};
87
88static inline __u32 geneve_net_vni_hash(u8 vni[3])
89{
90 __u32 vnid;
91
92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
93 return hash_32(vnid, VNI_HASH_BITS);
94}
95
96static __be64 vni_to_tunnel_id(const __u8 *vni)
97{
98#ifdef __BIG_ENDIAN
99 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
100#else
101 return (__force __be64)(((__force u64)vni[0] << 40) |
102 ((__force u64)vni[1] << 48) |
103 ((__force u64)vni[2] << 56));
104#endif
105}
106
107/* Convert 64 bit tunnel ID to 24 bit VNI. */
108static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
109{
110#ifdef __BIG_ENDIAN
111 vni[0] = (__force __u8)(tun_id >> 16);
112 vni[1] = (__force __u8)(tun_id >> 8);
113 vni[2] = (__force __u8)tun_id;
114#else
115 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
116 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
117 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
118#endif
119}
120
121static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
122{
123 return !memcmp(vni, &tun_id[5], 3);
124}
125
126static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
127{
128 return gs->sock->sk->sk_family;
129}
130
131static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
132 __be32 addr, u8 vni[])
133{
134 struct hlist_head *vni_list_head;
135 struct geneve_dev_node *node;
136 __u32 hash;
137
138 /* Find the device for this VNI */
139 hash = geneve_net_vni_hash(vni);
140 vni_list_head = &gs->vni_list[hash];
141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
143 addr == node->geneve->cfg.info.key.u.ipv4.dst)
144 return node->geneve;
145 }
146 return NULL;
147}
148
149#if IS_ENABLED(CONFIG_IPV6)
150static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
151 struct in6_addr addr6, u8 vni[])
152{
153 struct hlist_head *vni_list_head;
154 struct geneve_dev_node *node;
155 __u32 hash;
156
157 /* Find the device for this VNI */
158 hash = geneve_net_vni_hash(vni);
159 vni_list_head = &gs->vni_list[hash];
160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
163 return node->geneve;
164 }
165 return NULL;
166}
167#endif
168
169static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
170{
171 return (struct genevehdr *)(udp_hdr(skb) + 1);
172}
173
174static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
175 struct sk_buff *skb)
176{
177 static u8 zero_vni[3];
178 u8 *vni;
179
180 if (geneve_get_sk_family(gs) == AF_INET) {
181 struct iphdr *iph;
182 __be32 addr;
183
184 iph = ip_hdr(skb); /* outer IP header... */
185
186 if (gs->collect_md) {
187 vni = zero_vni;
188 addr = 0;
189 } else {
190 vni = geneve_hdr(skb)->vni;
191 addr = iph->saddr;
192 }
193
194 return geneve_lookup(gs, addr, vni);
195#if IS_ENABLED(CONFIG_IPV6)
196 } else if (geneve_get_sk_family(gs) == AF_INET6) {
197 static struct in6_addr zero_addr6;
198 struct ipv6hdr *ip6h;
199 struct in6_addr addr6;
200
201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
202
203 if (gs->collect_md) {
204 vni = zero_vni;
205 addr6 = zero_addr6;
206 } else {
207 vni = geneve_hdr(skb)->vni;
208 addr6 = ip6h->saddr;
209 }
210
211 return geneve6_lookup(gs, addr6, vni);
212#endif
213 }
214 return NULL;
215}
216
217/* geneve receive/decap routine */
218static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
219 struct sk_buff *skb)
220{
221 struct genevehdr *gnvh = geneve_hdr(skb);
222 struct metadata_dst *tun_dst = NULL;
223 unsigned int len;
224 int nh, err = 0;
225 void *oiph;
226
227 if (ip_tunnel_collect_metadata() || gs->collect_md) {
228 __be16 flags;
229
230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
232
233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
234 vni_to_tunnel_id(gnvh->vni),
235 gnvh->opt_len * 4);
236 if (!tun_dst) {
237 DEV_STATS_INC(geneve->dev, rx_dropped);
238 goto drop;
239 }
240 /* Update tunnel dst according to Geneve options. */
241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
242 gnvh->options, gnvh->opt_len * 4,
243 TUNNEL_GENEVE_OPT);
244 } else {
245 /* Drop packets w/ critical options,
246 * since we don't support any...
247 */
248 if (gnvh->critical) {
249 DEV_STATS_INC(geneve->dev, rx_frame_errors);
250 DEV_STATS_INC(geneve->dev, rx_errors);
251 goto drop;
252 }
253 }
254
255 if (tun_dst)
256 skb_dst_set(skb, &tun_dst->dst);
257
258 if (gnvh->proto_type == htons(ETH_P_TEB)) {
259 skb_reset_mac_header(skb);
260 skb->protocol = eth_type_trans(skb, geneve->dev);
261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
262
263 /* Ignore packet loops (and multicast echo) */
264 if (ether_addr_equal(eth_hdr(skb)->h_source,
265 geneve->dev->dev_addr)) {
266 DEV_STATS_INC(geneve->dev, rx_errors);
267 goto drop;
268 }
269 } else {
270 skb_reset_mac_header(skb);
271 skb->dev = geneve->dev;
272 skb->pkt_type = PACKET_HOST;
273 }
274
275 /* Save offset of outer header relative to skb->head,
276 * because we are going to reset the network header to the inner header
277 * and might change skb->head.
278 */
279 nh = skb_network_header(skb) - skb->head;
280
281 skb_reset_network_header(skb);
282
283 if (!pskb_inet_may_pull(skb)) {
284 DEV_STATS_INC(geneve->dev, rx_length_errors);
285 DEV_STATS_INC(geneve->dev, rx_errors);
286 goto drop;
287 }
288
289 /* Get the outer header. */
290 oiph = skb->head + nh;
291
292 if (geneve_get_sk_family(gs) == AF_INET)
293 err = IP_ECN_decapsulate(oiph, skb);
294#if IS_ENABLED(CONFIG_IPV6)
295 else
296 err = IP6_ECN_decapsulate(oiph, skb);
297#endif
298
299 if (unlikely(err)) {
300 if (log_ecn_error) {
301 if (geneve_get_sk_family(gs) == AF_INET)
302 net_info_ratelimited("non-ECT from %pI4 "
303 "with TOS=%#x\n",
304 &((struct iphdr *)oiph)->saddr,
305 ((struct iphdr *)oiph)->tos);
306#if IS_ENABLED(CONFIG_IPV6)
307 else
308 net_info_ratelimited("non-ECT from %pI6\n",
309 &((struct ipv6hdr *)oiph)->saddr);
310#endif
311 }
312 if (err > 1) {
313 DEV_STATS_INC(geneve->dev, rx_frame_errors);
314 DEV_STATS_INC(geneve->dev, rx_errors);
315 goto drop;
316 }
317 }
318
319 len = skb->len;
320 err = gro_cells_receive(&geneve->gro_cells, skb);
321 if (likely(err == NET_RX_SUCCESS))
322 dev_sw_netstats_rx_add(geneve->dev, len);
323
324 return;
325drop:
326 /* Consume bad packet */
327 kfree_skb(skb);
328}
329
330/* Setup stats when device is created */
331static int geneve_init(struct net_device *dev)
332{
333 struct geneve_dev *geneve = netdev_priv(dev);
334 int err;
335
336 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
337 if (!dev->tstats)
338 return -ENOMEM;
339
340 err = gro_cells_init(&geneve->gro_cells, dev);
341 if (err) {
342 free_percpu(dev->tstats);
343 return err;
344 }
345
346 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
347 if (err) {
348 free_percpu(dev->tstats);
349 gro_cells_destroy(&geneve->gro_cells);
350 return err;
351 }
352 return 0;
353}
354
355static void geneve_uninit(struct net_device *dev)
356{
357 struct geneve_dev *geneve = netdev_priv(dev);
358
359 dst_cache_destroy(&geneve->cfg.info.dst_cache);
360 gro_cells_destroy(&geneve->gro_cells);
361 free_percpu(dev->tstats);
362}
363
364/* Callback from net/ipv4/udp.c to receive packets */
365static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
366{
367 struct genevehdr *geneveh;
368 struct geneve_dev *geneve;
369 struct geneve_sock *gs;
370 __be16 inner_proto;
371 int opts_len;
372
373 /* Need UDP and Geneve header to be present */
374 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
375 goto drop;
376
377 /* Return packets with reserved bits set */
378 geneveh = geneve_hdr(skb);
379 if (unlikely(geneveh->ver != GENEVE_VER))
380 goto drop;
381
382 gs = rcu_dereference_sk_user_data(sk);
383 if (!gs)
384 goto drop;
385
386 geneve = geneve_lookup_skb(gs, skb);
387 if (!geneve)
388 goto drop;
389
390 inner_proto = geneveh->proto_type;
391
392 if (unlikely((!geneve->cfg.inner_proto_inherit &&
393 inner_proto != htons(ETH_P_TEB)))) {
394 DEV_STATS_INC(geneve->dev, rx_dropped);
395 goto drop;
396 }
397
398 opts_len = geneveh->opt_len * 4;
399 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
400 !net_eq(geneve->net, dev_net(geneve->dev)))) {
401 DEV_STATS_INC(geneve->dev, rx_dropped);
402 goto drop;
403 }
404
405 geneve_rx(geneve, gs, skb);
406 return 0;
407
408drop:
409 /* Consume bad packet */
410 kfree_skb(skb);
411 return 0;
412}
413
414/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
415static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
416{
417 struct genevehdr *geneveh;
418 struct geneve_sock *gs;
419 u8 zero_vni[3] = { 0 };
420 u8 *vni = zero_vni;
421
422 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
423 return -EINVAL;
424
425 geneveh = geneve_hdr(skb);
426 if (geneveh->ver != GENEVE_VER)
427 return -EINVAL;
428
429 if (geneveh->proto_type != htons(ETH_P_TEB))
430 return -EINVAL;
431
432 gs = rcu_dereference_sk_user_data(sk);
433 if (!gs)
434 return -ENOENT;
435
436 if (geneve_get_sk_family(gs) == AF_INET) {
437 struct iphdr *iph = ip_hdr(skb);
438 __be32 addr4 = 0;
439
440 if (!gs->collect_md) {
441 vni = geneve_hdr(skb)->vni;
442 addr4 = iph->daddr;
443 }
444
445 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
446 }
447
448#if IS_ENABLED(CONFIG_IPV6)
449 if (geneve_get_sk_family(gs) == AF_INET6) {
450 struct ipv6hdr *ip6h = ipv6_hdr(skb);
451 struct in6_addr addr6;
452
453 memset(&addr6, 0, sizeof(struct in6_addr));
454
455 if (!gs->collect_md) {
456 vni = geneve_hdr(skb)->vni;
457 addr6 = ip6h->daddr;
458 }
459
460 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
461 }
462#endif
463
464 return -EPFNOSUPPORT;
465}
466
467static struct socket *geneve_create_sock(struct net *net, bool ipv6,
468 __be16 port, bool ipv6_rx_csum)
469{
470 struct socket *sock;
471 struct udp_port_cfg udp_conf;
472 int err;
473
474 memset(&udp_conf, 0, sizeof(udp_conf));
475
476 if (ipv6) {
477 udp_conf.family = AF_INET6;
478 udp_conf.ipv6_v6only = 1;
479 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
480 } else {
481 udp_conf.family = AF_INET;
482 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
483 }
484
485 udp_conf.local_udp_port = port;
486
487 /* Open UDP socket */
488 err = udp_sock_create(net, &udp_conf, &sock);
489 if (err < 0)
490 return ERR_PTR(err);
491
492 udp_allow_gso(sock->sk);
493 return sock;
494}
495
496static int geneve_hlen(struct genevehdr *gh)
497{
498 return sizeof(*gh) + gh->opt_len * 4;
499}
500
501static struct sk_buff *geneve_gro_receive(struct sock *sk,
502 struct list_head *head,
503 struct sk_buff *skb)
504{
505 struct sk_buff *pp = NULL;
506 struct sk_buff *p;
507 struct genevehdr *gh, *gh2;
508 unsigned int hlen, gh_len, off_gnv;
509 const struct packet_offload *ptype;
510 __be16 type;
511 int flush = 1;
512
513 off_gnv = skb_gro_offset(skb);
514 hlen = off_gnv + sizeof(*gh);
515 gh = skb_gro_header(skb, hlen, off_gnv);
516 if (unlikely(!gh))
517 goto out;
518
519 if (gh->ver != GENEVE_VER || gh->oam)
520 goto out;
521 gh_len = geneve_hlen(gh);
522
523 hlen = off_gnv + gh_len;
524 if (skb_gro_header_hard(skb, hlen)) {
525 gh = skb_gro_header_slow(skb, hlen, off_gnv);
526 if (unlikely(!gh))
527 goto out;
528 }
529
530 list_for_each_entry(p, head, list) {
531 if (!NAPI_GRO_CB(p)->same_flow)
532 continue;
533
534 gh2 = (struct genevehdr *)(p->data + off_gnv);
535 if (gh->opt_len != gh2->opt_len ||
536 memcmp(gh, gh2, gh_len)) {
537 NAPI_GRO_CB(p)->same_flow = 0;
538 continue;
539 }
540 }
541
542 skb_gro_pull(skb, gh_len);
543 skb_gro_postpull_rcsum(skb, gh, gh_len);
544 type = gh->proto_type;
545 if (likely(type == htons(ETH_P_TEB)))
546 return call_gro_receive(eth_gro_receive, head, skb);
547
548 ptype = gro_find_receive_by_type(type);
549 if (!ptype)
550 goto out;
551
552 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
553 flush = 0;
554
555out:
556 skb_gro_flush_final(skb, pp, flush);
557
558 return pp;
559}
560
561static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
562 int nhoff)
563{
564 struct genevehdr *gh;
565 struct packet_offload *ptype;
566 __be16 type;
567 int gh_len;
568 int err = -ENOSYS;
569
570 gh = (struct genevehdr *)(skb->data + nhoff);
571 gh_len = geneve_hlen(gh);
572 type = gh->proto_type;
573
574 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
575 if (likely(type == htons(ETH_P_TEB)))
576 return eth_gro_complete(skb, nhoff + gh_len);
577
578 ptype = gro_find_complete_by_type(type);
579 if (ptype)
580 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
581
582 skb_set_inner_mac_header(skb, nhoff + gh_len);
583
584 return err;
585}
586
587/* Create new listen socket if needed */
588static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
589 bool ipv6, bool ipv6_rx_csum)
590{
591 struct geneve_net *gn = net_generic(net, geneve_net_id);
592 struct geneve_sock *gs;
593 struct socket *sock;
594 struct udp_tunnel_sock_cfg tunnel_cfg;
595 int h;
596
597 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
598 if (!gs)
599 return ERR_PTR(-ENOMEM);
600
601 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
602 if (IS_ERR(sock)) {
603 kfree(gs);
604 return ERR_CAST(sock);
605 }
606
607 gs->sock = sock;
608 gs->refcnt = 1;
609 for (h = 0; h < VNI_HASH_SIZE; ++h)
610 INIT_HLIST_HEAD(&gs->vni_list[h]);
611
612 /* Initialize the geneve udp offloads structure */
613 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
614
615 /* Mark socket as an encapsulation socket */
616 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
617 tunnel_cfg.sk_user_data = gs;
618 tunnel_cfg.encap_type = 1;
619 tunnel_cfg.gro_receive = geneve_gro_receive;
620 tunnel_cfg.gro_complete = geneve_gro_complete;
621 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
622 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
623 tunnel_cfg.encap_destroy = NULL;
624 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
625 list_add(&gs->list, &gn->sock_list);
626 return gs;
627}
628
629static void __geneve_sock_release(struct geneve_sock *gs)
630{
631 if (!gs || --gs->refcnt)
632 return;
633
634 list_del(&gs->list);
635 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
636 udp_tunnel_sock_release(gs->sock);
637 kfree_rcu(gs, rcu);
638}
639
640static void geneve_sock_release(struct geneve_dev *geneve)
641{
642 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
643#if IS_ENABLED(CONFIG_IPV6)
644 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
645
646 rcu_assign_pointer(geneve->sock6, NULL);
647#endif
648
649 rcu_assign_pointer(geneve->sock4, NULL);
650 synchronize_net();
651
652 __geneve_sock_release(gs4);
653#if IS_ENABLED(CONFIG_IPV6)
654 __geneve_sock_release(gs6);
655#endif
656}
657
658static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
659 sa_family_t family,
660 __be16 dst_port)
661{
662 struct geneve_sock *gs;
663
664 list_for_each_entry(gs, &gn->sock_list, list) {
665 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
666 geneve_get_sk_family(gs) == family) {
667 return gs;
668 }
669 }
670 return NULL;
671}
672
673static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
674{
675 struct net *net = geneve->net;
676 struct geneve_net *gn = net_generic(net, geneve_net_id);
677 struct geneve_dev_node *node;
678 struct geneve_sock *gs;
679 __u8 vni[3];
680 __u32 hash;
681
682 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
683 if (gs) {
684 gs->refcnt++;
685 goto out;
686 }
687
688 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
689 geneve->cfg.use_udp6_rx_checksums);
690 if (IS_ERR(gs))
691 return PTR_ERR(gs);
692
693out:
694 gs->collect_md = geneve->cfg.collect_md;
695#if IS_ENABLED(CONFIG_IPV6)
696 if (ipv6) {
697 rcu_assign_pointer(geneve->sock6, gs);
698 node = &geneve->hlist6;
699 } else
700#endif
701 {
702 rcu_assign_pointer(geneve->sock4, gs);
703 node = &geneve->hlist4;
704 }
705 node->geneve = geneve;
706
707 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
708 hash = geneve_net_vni_hash(vni);
709 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
710 return 0;
711}
712
713static int geneve_open(struct net_device *dev)
714{
715 struct geneve_dev *geneve = netdev_priv(dev);
716 bool metadata = geneve->cfg.collect_md;
717 bool ipv4, ipv6;
718 int ret = 0;
719
720 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
721 ipv4 = !ipv6 || metadata;
722#if IS_ENABLED(CONFIG_IPV6)
723 if (ipv6) {
724 ret = geneve_sock_add(geneve, true);
725 if (ret < 0 && ret != -EAFNOSUPPORT)
726 ipv4 = false;
727 }
728#endif
729 if (ipv4)
730 ret = geneve_sock_add(geneve, false);
731 if (ret < 0)
732 geneve_sock_release(geneve);
733
734 return ret;
735}
736
737static int geneve_stop(struct net_device *dev)
738{
739 struct geneve_dev *geneve = netdev_priv(dev);
740
741 hlist_del_init_rcu(&geneve->hlist4.hlist);
742#if IS_ENABLED(CONFIG_IPV6)
743 hlist_del_init_rcu(&geneve->hlist6.hlist);
744#endif
745 geneve_sock_release(geneve);
746 return 0;
747}
748
749static void geneve_build_header(struct genevehdr *geneveh,
750 const struct ip_tunnel_info *info,
751 __be16 inner_proto)
752{
753 geneveh->ver = GENEVE_VER;
754 geneveh->opt_len = info->options_len / 4;
755 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
756 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
757 geneveh->rsvd1 = 0;
758 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
759 geneveh->proto_type = inner_proto;
760 geneveh->rsvd2 = 0;
761
762 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
763 ip_tunnel_info_opts_get(geneveh->options, info);
764}
765
766static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
767 const struct ip_tunnel_info *info,
768 bool xnet, int ip_hdr_len,
769 bool inner_proto_inherit)
770{
771 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
772 struct genevehdr *gnvh;
773 __be16 inner_proto;
774 int min_headroom;
775 int err;
776
777 skb_reset_mac_header(skb);
778 skb_scrub_packet(skb, xnet);
779
780 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
781 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
782 err = skb_cow_head(skb, min_headroom);
783 if (unlikely(err))
784 goto free_dst;
785
786 err = udp_tunnel_handle_offloads(skb, udp_sum);
787 if (err)
788 goto free_dst;
789
790 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
791 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
792 geneve_build_header(gnvh, info, inner_proto);
793 skb_set_inner_protocol(skb, inner_proto);
794 return 0;
795
796free_dst:
797 dst_release(dst);
798 return err;
799}
800
801static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
802 const struct ip_tunnel_info *info,
803 bool *use_cache)
804{
805 struct geneve_dev *geneve = netdev_priv(dev);
806 u8 dsfield;
807
808 dsfield = info->key.tos;
809 if (dsfield == 1 && !geneve->cfg.collect_md) {
810 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
811 *use_cache = false;
812 }
813
814 return dsfield;
815}
816
817static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
818 struct geneve_dev *geneve,
819 const struct ip_tunnel_info *info)
820{
821 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
822 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
823 const struct ip_tunnel_key *key = &info->key;
824 struct rtable *rt;
825 bool use_cache;
826 __u8 tos, ttl;
827 __be16 df = 0;
828 __be32 saddr;
829 __be16 sport;
830 int err;
831
832 if (!pskb_inet_may_pull(skb))
833 return -EINVAL;
834
835 if (!gs4)
836 return -EIO;
837
838 use_cache = ip_tunnel_dst_cache_usable(skb, info);
839 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
840 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
841
842 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
843 &info->key,
844 sport, geneve->cfg.info.key.tp_dst, tos,
845 use_cache ?
846 (struct dst_cache *)&info->dst_cache : NULL);
847 if (IS_ERR(rt))
848 return PTR_ERR(rt);
849
850 err = skb_tunnel_check_pmtu(skb, &rt->dst,
851 GENEVE_IPV4_HLEN + info->options_len,
852 netif_is_any_bridge_port(dev));
853 if (err < 0) {
854 dst_release(&rt->dst);
855 return err;
856 } else if (err) {
857 struct ip_tunnel_info *info;
858
859 info = skb_tunnel_info(skb);
860 if (info) {
861 struct ip_tunnel_info *unclone;
862
863 unclone = skb_tunnel_info_unclone(skb);
864 if (unlikely(!unclone)) {
865 dst_release(&rt->dst);
866 return -ENOMEM;
867 }
868
869 unclone->key.u.ipv4.dst = saddr;
870 unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
871 }
872
873 if (!pskb_may_pull(skb, ETH_HLEN)) {
874 dst_release(&rt->dst);
875 return -EINVAL;
876 }
877
878 skb->protocol = eth_type_trans(skb, geneve->dev);
879 __netif_rx(skb);
880 dst_release(&rt->dst);
881 return -EMSGSIZE;
882 }
883
884 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
885 if (geneve->cfg.collect_md) {
886 ttl = key->ttl;
887
888 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
889 } else {
890 if (geneve->cfg.ttl_inherit)
891 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
892 else
893 ttl = key->ttl;
894 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
895
896 if (geneve->cfg.df == GENEVE_DF_SET) {
897 df = htons(IP_DF);
898 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
899 struct ethhdr *eth = eth_hdr(skb);
900
901 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
902 df = htons(IP_DF);
903 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
904 struct iphdr *iph = ip_hdr(skb);
905
906 if (iph->frag_off & htons(IP_DF))
907 df = htons(IP_DF);
908 }
909 }
910 }
911
912 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
913 geneve->cfg.inner_proto_inherit);
914 if (unlikely(err))
915 return err;
916
917 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
918 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
919 !net_eq(geneve->net, dev_net(geneve->dev)),
920 !(info->key.tun_flags & TUNNEL_CSUM));
921 return 0;
922}
923
924#if IS_ENABLED(CONFIG_IPV6)
925static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
926 struct geneve_dev *geneve,
927 const struct ip_tunnel_info *info)
928{
929 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
930 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
931 const struct ip_tunnel_key *key = &info->key;
932 struct dst_entry *dst = NULL;
933 struct in6_addr saddr;
934 bool use_cache;
935 __u8 prio, ttl;
936 __be16 sport;
937 int err;
938
939 if (!pskb_inet_may_pull(skb))
940 return -EINVAL;
941
942 if (!gs6)
943 return -EIO;
944
945 use_cache = ip_tunnel_dst_cache_usable(skb, info);
946 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
947 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
948
949 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
950 &saddr, key, sport,
951 geneve->cfg.info.key.tp_dst, prio,
952 use_cache ?
953 (struct dst_cache *)&info->dst_cache : NULL);
954 if (IS_ERR(dst))
955 return PTR_ERR(dst);
956
957 err = skb_tunnel_check_pmtu(skb, dst,
958 GENEVE_IPV6_HLEN + info->options_len,
959 netif_is_any_bridge_port(dev));
960 if (err < 0) {
961 dst_release(dst);
962 return err;
963 } else if (err) {
964 struct ip_tunnel_info *info = skb_tunnel_info(skb);
965
966 if (info) {
967 struct ip_tunnel_info *unclone;
968
969 unclone = skb_tunnel_info_unclone(skb);
970 if (unlikely(!unclone)) {
971 dst_release(dst);
972 return -ENOMEM;
973 }
974
975 unclone->key.u.ipv6.dst = saddr;
976 unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
977 }
978
979 if (!pskb_may_pull(skb, ETH_HLEN)) {
980 dst_release(dst);
981 return -EINVAL;
982 }
983
984 skb->protocol = eth_type_trans(skb, geneve->dev);
985 __netif_rx(skb);
986 dst_release(dst);
987 return -EMSGSIZE;
988 }
989
990 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
991 if (geneve->cfg.collect_md) {
992 ttl = key->ttl;
993 } else {
994 if (geneve->cfg.ttl_inherit)
995 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
996 else
997 ttl = key->ttl;
998 ttl = ttl ? : ip6_dst_hoplimit(dst);
999 }
1000 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1001 geneve->cfg.inner_proto_inherit);
1002 if (unlikely(err))
1003 return err;
1004
1005 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1006 &saddr, &key->u.ipv6.dst, prio, ttl,
1007 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1008 !(info->key.tun_flags & TUNNEL_CSUM));
1009 return 0;
1010}
1011#endif
1012
1013static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1014{
1015 struct geneve_dev *geneve = netdev_priv(dev);
1016 struct ip_tunnel_info *info = NULL;
1017 int err;
1018
1019 if (geneve->cfg.collect_md) {
1020 info = skb_tunnel_info(skb);
1021 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1022 netdev_dbg(dev, "no tunnel metadata\n");
1023 dev_kfree_skb(skb);
1024 DEV_STATS_INC(dev, tx_dropped);
1025 return NETDEV_TX_OK;
1026 }
1027 } else {
1028 info = &geneve->cfg.info;
1029 }
1030
1031 rcu_read_lock();
1032#if IS_ENABLED(CONFIG_IPV6)
1033 if (info->mode & IP_TUNNEL_INFO_IPV6)
1034 err = geneve6_xmit_skb(skb, dev, geneve, info);
1035 else
1036#endif
1037 err = geneve_xmit_skb(skb, dev, geneve, info);
1038 rcu_read_unlock();
1039
1040 if (likely(!err))
1041 return NETDEV_TX_OK;
1042
1043 if (err != -EMSGSIZE)
1044 dev_kfree_skb(skb);
1045
1046 if (err == -ELOOP)
1047 DEV_STATS_INC(dev, collisions);
1048 else if (err == -ENETUNREACH)
1049 DEV_STATS_INC(dev, tx_carrier_errors);
1050
1051 DEV_STATS_INC(dev, tx_errors);
1052 return NETDEV_TX_OK;
1053}
1054
1055static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1056{
1057 if (new_mtu > dev->max_mtu)
1058 new_mtu = dev->max_mtu;
1059 else if (new_mtu < dev->min_mtu)
1060 new_mtu = dev->min_mtu;
1061
1062 dev->mtu = new_mtu;
1063 return 0;
1064}
1065
1066static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1067{
1068 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1069 struct geneve_dev *geneve = netdev_priv(dev);
1070 __be16 sport;
1071
1072 if (ip_tunnel_info_af(info) == AF_INET) {
1073 struct rtable *rt;
1074 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1075 bool use_cache;
1076 __be32 saddr;
1077 u8 tos;
1078
1079 if (!gs4)
1080 return -EIO;
1081
1082 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1083 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1084 sport = udp_flow_src_port(geneve->net, skb,
1085 1, USHRT_MAX, true);
1086
1087 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1088 &info->key,
1089 sport, geneve->cfg.info.key.tp_dst,
1090 tos,
1091 use_cache ? &info->dst_cache : NULL);
1092 if (IS_ERR(rt))
1093 return PTR_ERR(rt);
1094
1095 ip_rt_put(rt);
1096 info->key.u.ipv4.src = saddr;
1097#if IS_ENABLED(CONFIG_IPV6)
1098 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1099 struct dst_entry *dst;
1100 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1101 struct in6_addr saddr;
1102 bool use_cache;
1103 u8 prio;
1104
1105 if (!gs6)
1106 return -EIO;
1107
1108 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1109 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1110 sport = udp_flow_src_port(geneve->net, skb,
1111 1, USHRT_MAX, true);
1112
1113 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1114 &saddr, &info->key, sport,
1115 geneve->cfg.info.key.tp_dst, prio,
1116 use_cache ? &info->dst_cache : NULL);
1117 if (IS_ERR(dst))
1118 return PTR_ERR(dst);
1119
1120 dst_release(dst);
1121 info->key.u.ipv6.src = saddr;
1122#endif
1123 } else {
1124 return -EINVAL;
1125 }
1126
1127 info->key.tp_src = sport;
1128 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1129 return 0;
1130}
1131
1132static const struct net_device_ops geneve_netdev_ops = {
1133 .ndo_init = geneve_init,
1134 .ndo_uninit = geneve_uninit,
1135 .ndo_open = geneve_open,
1136 .ndo_stop = geneve_stop,
1137 .ndo_start_xmit = geneve_xmit,
1138 .ndo_get_stats64 = dev_get_tstats64,
1139 .ndo_change_mtu = geneve_change_mtu,
1140 .ndo_validate_addr = eth_validate_addr,
1141 .ndo_set_mac_address = eth_mac_addr,
1142 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1143};
1144
1145static void geneve_get_drvinfo(struct net_device *dev,
1146 struct ethtool_drvinfo *drvinfo)
1147{
1148 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1149 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1150}
1151
1152static const struct ethtool_ops geneve_ethtool_ops = {
1153 .get_drvinfo = geneve_get_drvinfo,
1154 .get_link = ethtool_op_get_link,
1155};
1156
1157/* Info for udev, that this is a virtual tunnel endpoint */
1158static struct device_type geneve_type = {
1159 .name = "geneve",
1160};
1161
1162/* Calls the ndo_udp_tunnel_add of the caller in order to
1163 * supply the listening GENEVE udp ports. Callers are expected
1164 * to implement the ndo_udp_tunnel_add.
1165 */
1166static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1167{
1168 struct net *net = dev_net(dev);
1169 struct geneve_net *gn = net_generic(net, geneve_net_id);
1170 struct geneve_sock *gs;
1171
1172 rcu_read_lock();
1173 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1174 if (push) {
1175 udp_tunnel_push_rx_port(dev, gs->sock,
1176 UDP_TUNNEL_TYPE_GENEVE);
1177 } else {
1178 udp_tunnel_drop_rx_port(dev, gs->sock,
1179 UDP_TUNNEL_TYPE_GENEVE);
1180 }
1181 }
1182 rcu_read_unlock();
1183}
1184
1185/* Initialize the device structure. */
1186static void geneve_setup(struct net_device *dev)
1187{
1188 ether_setup(dev);
1189
1190 dev->netdev_ops = &geneve_netdev_ops;
1191 dev->ethtool_ops = &geneve_ethtool_ops;
1192 dev->needs_free_netdev = true;
1193
1194 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1195
1196 dev->features |= NETIF_F_LLTX;
1197 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1198 dev->features |= NETIF_F_RXCSUM;
1199 dev->features |= NETIF_F_GSO_SOFTWARE;
1200
1201 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1202 dev->hw_features |= NETIF_F_RXCSUM;
1203 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1204
1205 /* MTU range: 68 - (something less than 65535) */
1206 dev->min_mtu = ETH_MIN_MTU;
1207 /* The max_mtu calculation does not take account of GENEVE
1208 * options, to avoid excluding potentially valid
1209 * configurations. This will be further reduced by IPvX hdr size.
1210 */
1211 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1212
1213 netif_keep_dst(dev);
1214 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1215 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1216 eth_hw_addr_random(dev);
1217}
1218
1219static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1220 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1221 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1222 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1223 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1224 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1225 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1226 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1227 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1228 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1229 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1230 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1231 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1232 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1233 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1234 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG },
1235};
1236
1237static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1238 struct netlink_ext_ack *extack)
1239{
1240 if (tb[IFLA_ADDRESS]) {
1241 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1242 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1243 "Provided link layer address is not Ethernet");
1244 return -EINVAL;
1245 }
1246
1247 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1248 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1249 "Provided Ethernet address is not unicast");
1250 return -EADDRNOTAVAIL;
1251 }
1252 }
1253
1254 if (!data) {
1255 NL_SET_ERR_MSG(extack,
1256 "Not enough attributes provided to perform the operation");
1257 return -EINVAL;
1258 }
1259
1260 if (data[IFLA_GENEVE_ID]) {
1261 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1262
1263 if (vni >= GENEVE_N_VID) {
1264 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1265 "Geneve ID must be lower than 16777216");
1266 return -ERANGE;
1267 }
1268 }
1269
1270 if (data[IFLA_GENEVE_DF]) {
1271 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1272
1273 if (df < 0 || df > GENEVE_DF_MAX) {
1274 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1275 "Invalid DF attribute");
1276 return -EINVAL;
1277 }
1278 }
1279
1280 return 0;
1281}
1282
1283static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1284 const struct ip_tunnel_info *info,
1285 bool *tun_on_same_port,
1286 bool *tun_collect_md)
1287{
1288 struct geneve_dev *geneve, *t = NULL;
1289
1290 *tun_on_same_port = false;
1291 *tun_collect_md = false;
1292 list_for_each_entry(geneve, &gn->geneve_list, next) {
1293 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1294 *tun_collect_md = geneve->cfg.collect_md;
1295 *tun_on_same_port = true;
1296 }
1297 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1298 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1299 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1300 t = geneve;
1301 }
1302 return t;
1303}
1304
1305static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1306{
1307 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1308 info->key.ttl || info->key.label || info->key.tp_src ||
1309 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1310}
1311
1312static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1313 struct ip_tunnel_info *b)
1314{
1315 if (ip_tunnel_info_af(a) == AF_INET)
1316 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1317 else
1318 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1319}
1320
1321static int geneve_configure(struct net *net, struct net_device *dev,
1322 struct netlink_ext_ack *extack,
1323 const struct geneve_config *cfg)
1324{
1325 struct geneve_net *gn = net_generic(net, geneve_net_id);
1326 struct geneve_dev *t, *geneve = netdev_priv(dev);
1327 const struct ip_tunnel_info *info = &cfg->info;
1328 bool tun_collect_md, tun_on_same_port;
1329 int err, encap_len;
1330
1331 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1332 NL_SET_ERR_MSG(extack,
1333 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1334 return -EINVAL;
1335 }
1336
1337 geneve->net = net;
1338 geneve->dev = dev;
1339
1340 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1341 if (t)
1342 return -EBUSY;
1343
1344 /* make enough headroom for basic scenario */
1345 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1346 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1347 encap_len += sizeof(struct iphdr);
1348 dev->max_mtu -= sizeof(struct iphdr);
1349 } else {
1350 encap_len += sizeof(struct ipv6hdr);
1351 dev->max_mtu -= sizeof(struct ipv6hdr);
1352 }
1353 dev->needed_headroom = encap_len + ETH_HLEN;
1354
1355 if (cfg->collect_md) {
1356 if (tun_on_same_port) {
1357 NL_SET_ERR_MSG(extack,
1358 "There can be only one externally controlled device on a destination port");
1359 return -EPERM;
1360 }
1361 } else {
1362 if (tun_collect_md) {
1363 NL_SET_ERR_MSG(extack,
1364 "There already exists an externally controlled device on this destination port");
1365 return -EPERM;
1366 }
1367 }
1368
1369 dst_cache_reset(&geneve->cfg.info.dst_cache);
1370 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1371
1372 if (geneve->cfg.inner_proto_inherit) {
1373 dev->header_ops = NULL;
1374 dev->type = ARPHRD_NONE;
1375 dev->hard_header_len = 0;
1376 dev->addr_len = 0;
1377 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1378 }
1379
1380 err = register_netdevice(dev);
1381 if (err)
1382 return err;
1383
1384 list_add(&geneve->next, &gn->geneve_list);
1385 return 0;
1386}
1387
1388static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1389{
1390 memset(info, 0, sizeof(*info));
1391 info->key.tp_dst = htons(dst_port);
1392}
1393
1394static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1395 struct netlink_ext_ack *extack,
1396 struct geneve_config *cfg, bool changelink)
1397{
1398 struct ip_tunnel_info *info = &cfg->info;
1399 int attrtype;
1400
1401 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1402 NL_SET_ERR_MSG(extack,
1403 "Cannot specify both IPv4 and IPv6 Remote addresses");
1404 return -EINVAL;
1405 }
1406
1407 if (data[IFLA_GENEVE_REMOTE]) {
1408 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1409 attrtype = IFLA_GENEVE_REMOTE;
1410 goto change_notsup;
1411 }
1412
1413 info->key.u.ipv4.dst =
1414 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1415
1416 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1417 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1418 "Remote IPv4 address cannot be Multicast");
1419 return -EINVAL;
1420 }
1421 }
1422
1423 if (data[IFLA_GENEVE_REMOTE6]) {
1424#if IS_ENABLED(CONFIG_IPV6)
1425 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1426 attrtype = IFLA_GENEVE_REMOTE6;
1427 goto change_notsup;
1428 }
1429
1430 info->mode = IP_TUNNEL_INFO_IPV6;
1431 info->key.u.ipv6.dst =
1432 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1433
1434 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1435 IPV6_ADDR_LINKLOCAL) {
1436 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1437 "Remote IPv6 address cannot be link-local");
1438 return -EINVAL;
1439 }
1440 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1441 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1442 "Remote IPv6 address cannot be Multicast");
1443 return -EINVAL;
1444 }
1445 info->key.tun_flags |= TUNNEL_CSUM;
1446 cfg->use_udp6_rx_checksums = true;
1447#else
1448 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1449 "IPv6 support not enabled in the kernel");
1450 return -EPFNOSUPPORT;
1451#endif
1452 }
1453
1454 if (data[IFLA_GENEVE_ID]) {
1455 __u32 vni;
1456 __u8 tvni[3];
1457 __be64 tunid;
1458
1459 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1460 tvni[0] = (vni & 0x00ff0000) >> 16;
1461 tvni[1] = (vni & 0x0000ff00) >> 8;
1462 tvni[2] = vni & 0x000000ff;
1463
1464 tunid = vni_to_tunnel_id(tvni);
1465 if (changelink && (tunid != info->key.tun_id)) {
1466 attrtype = IFLA_GENEVE_ID;
1467 goto change_notsup;
1468 }
1469 info->key.tun_id = tunid;
1470 }
1471
1472 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1473 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1474 cfg->ttl_inherit = true;
1475 else
1476 cfg->ttl_inherit = false;
1477 } else if (data[IFLA_GENEVE_TTL]) {
1478 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1479 cfg->ttl_inherit = false;
1480 }
1481
1482 if (data[IFLA_GENEVE_TOS])
1483 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1484
1485 if (data[IFLA_GENEVE_DF])
1486 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1487
1488 if (data[IFLA_GENEVE_LABEL]) {
1489 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1490 IPV6_FLOWLABEL_MASK;
1491 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1492 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1493 "Label attribute only applies for IPv6 Geneve devices");
1494 return -EINVAL;
1495 }
1496 }
1497
1498 if (data[IFLA_GENEVE_PORT]) {
1499 if (changelink) {
1500 attrtype = IFLA_GENEVE_PORT;
1501 goto change_notsup;
1502 }
1503 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1504 }
1505
1506 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1507 if (changelink) {
1508 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1509 goto change_notsup;
1510 }
1511 cfg->collect_md = true;
1512 }
1513
1514 if (data[IFLA_GENEVE_UDP_CSUM]) {
1515 if (changelink) {
1516 attrtype = IFLA_GENEVE_UDP_CSUM;
1517 goto change_notsup;
1518 }
1519 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1520 info->key.tun_flags |= TUNNEL_CSUM;
1521 }
1522
1523 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1524#if IS_ENABLED(CONFIG_IPV6)
1525 if (changelink) {
1526 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1527 goto change_notsup;
1528 }
1529 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1530 info->key.tun_flags &= ~TUNNEL_CSUM;
1531#else
1532 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1533 "IPv6 support not enabled in the kernel");
1534 return -EPFNOSUPPORT;
1535#endif
1536 }
1537
1538 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1539#if IS_ENABLED(CONFIG_IPV6)
1540 if (changelink) {
1541 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1542 goto change_notsup;
1543 }
1544 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1545 cfg->use_udp6_rx_checksums = false;
1546#else
1547 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1548 "IPv6 support not enabled in the kernel");
1549 return -EPFNOSUPPORT;
1550#endif
1551 }
1552
1553 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1554 if (changelink) {
1555 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1556 goto change_notsup;
1557 }
1558 cfg->inner_proto_inherit = true;
1559 }
1560
1561 return 0;
1562change_notsup:
1563 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1564 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1565 return -EOPNOTSUPP;
1566}
1567
1568static void geneve_link_config(struct net_device *dev,
1569 struct ip_tunnel_info *info, struct nlattr *tb[])
1570{
1571 struct geneve_dev *geneve = netdev_priv(dev);
1572 int ldev_mtu = 0;
1573
1574 if (tb[IFLA_MTU]) {
1575 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1576 return;
1577 }
1578
1579 switch (ip_tunnel_info_af(info)) {
1580 case AF_INET: {
1581 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1582 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1583
1584 if (!IS_ERR(rt) && rt->dst.dev) {
1585 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1586 ip_rt_put(rt);
1587 }
1588 break;
1589 }
1590#if IS_ENABLED(CONFIG_IPV6)
1591 case AF_INET6: {
1592 struct rt6_info *rt;
1593
1594 if (!__in6_dev_get(dev))
1595 break;
1596
1597 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1598 NULL, 0);
1599
1600 if (rt && rt->dst.dev)
1601 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1602 ip6_rt_put(rt);
1603 break;
1604 }
1605#endif
1606 }
1607
1608 if (ldev_mtu <= 0)
1609 return;
1610
1611 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1612}
1613
1614static int geneve_newlink(struct net *net, struct net_device *dev,
1615 struct nlattr *tb[], struct nlattr *data[],
1616 struct netlink_ext_ack *extack)
1617{
1618 struct geneve_config cfg = {
1619 .df = GENEVE_DF_UNSET,
1620 .use_udp6_rx_checksums = false,
1621 .ttl_inherit = false,
1622 .collect_md = false,
1623 };
1624 int err;
1625
1626 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1627 err = geneve_nl2info(tb, data, extack, &cfg, false);
1628 if (err)
1629 return err;
1630
1631 err = geneve_configure(net, dev, extack, &cfg);
1632 if (err)
1633 return err;
1634
1635 geneve_link_config(dev, &cfg.info, tb);
1636
1637 return 0;
1638}
1639
1640/* Quiesces the geneve device data path for both TX and RX.
1641 *
1642 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1643 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1644 * to complete for the existing set of in-flight packets to be transmitted,
1645 * then we would have quiesced the transmit data path. All the future packets
1646 * will get dropped until we unquiesce the data path.
1647 *
1648 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1649 * if we set that to NULL under RCU and wait for synchronize_net() to
1650 * complete, then we would have quiesced the receive data path.
1651 */
1652static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1653 struct geneve_sock **gs6)
1654{
1655 *gs4 = rtnl_dereference(geneve->sock4);
1656 rcu_assign_pointer(geneve->sock4, NULL);
1657 if (*gs4)
1658 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1659#if IS_ENABLED(CONFIG_IPV6)
1660 *gs6 = rtnl_dereference(geneve->sock6);
1661 rcu_assign_pointer(geneve->sock6, NULL);
1662 if (*gs6)
1663 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1664#else
1665 *gs6 = NULL;
1666#endif
1667 synchronize_net();
1668}
1669
1670/* Resumes the geneve device data path for both TX and RX. */
1671static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1672 struct geneve_sock __maybe_unused *gs6)
1673{
1674 rcu_assign_pointer(geneve->sock4, gs4);
1675 if (gs4)
1676 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1677#if IS_ENABLED(CONFIG_IPV6)
1678 rcu_assign_pointer(geneve->sock6, gs6);
1679 if (gs6)
1680 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1681#endif
1682 synchronize_net();
1683}
1684
1685static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1686 struct nlattr *data[],
1687 struct netlink_ext_ack *extack)
1688{
1689 struct geneve_dev *geneve = netdev_priv(dev);
1690 struct geneve_sock *gs4, *gs6;
1691 struct geneve_config cfg;
1692 int err;
1693
1694 /* If the geneve device is configured for metadata (or externally
1695 * controlled, for example, OVS), then nothing can be changed.
1696 */
1697 if (geneve->cfg.collect_md)
1698 return -EOPNOTSUPP;
1699
1700 /* Start with the existing info. */
1701 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1702 err = geneve_nl2info(tb, data, extack, &cfg, true);
1703 if (err)
1704 return err;
1705
1706 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1707 dst_cache_reset(&cfg.info.dst_cache);
1708 geneve_link_config(dev, &cfg.info, tb);
1709 }
1710
1711 geneve_quiesce(geneve, &gs4, &gs6);
1712 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1713 geneve_unquiesce(geneve, gs4, gs6);
1714
1715 return 0;
1716}
1717
1718static void geneve_dellink(struct net_device *dev, struct list_head *head)
1719{
1720 struct geneve_dev *geneve = netdev_priv(dev);
1721
1722 list_del(&geneve->next);
1723 unregister_netdevice_queue(dev, head);
1724}
1725
1726static size_t geneve_get_size(const struct net_device *dev)
1727{
1728 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1729 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1730 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1731 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1732 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1733 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1734 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1735 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1736 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1737 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1738 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1739 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1740 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1741 0;
1742}
1743
1744static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1745{
1746 struct geneve_dev *geneve = netdev_priv(dev);
1747 struct ip_tunnel_info *info = &geneve->cfg.info;
1748 bool ttl_inherit = geneve->cfg.ttl_inherit;
1749 bool metadata = geneve->cfg.collect_md;
1750 __u8 tmp_vni[3];
1751 __u32 vni;
1752
1753 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1754 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1755 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1756 goto nla_put_failure;
1757
1758 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1759 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1760 info->key.u.ipv4.dst))
1761 goto nla_put_failure;
1762 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1763 !!(info->key.tun_flags & TUNNEL_CSUM)))
1764 goto nla_put_failure;
1765
1766#if IS_ENABLED(CONFIG_IPV6)
1767 } else if (!metadata) {
1768 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1769 &info->key.u.ipv6.dst))
1770 goto nla_put_failure;
1771 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1772 !(info->key.tun_flags & TUNNEL_CSUM)))
1773 goto nla_put_failure;
1774#endif
1775 }
1776
1777 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1778 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1779 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1780 goto nla_put_failure;
1781
1782 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1783 goto nla_put_failure;
1784
1785 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1786 goto nla_put_failure;
1787
1788 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1789 goto nla_put_failure;
1790
1791#if IS_ENABLED(CONFIG_IPV6)
1792 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1793 !geneve->cfg.use_udp6_rx_checksums))
1794 goto nla_put_failure;
1795#endif
1796
1797 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1798 goto nla_put_failure;
1799
1800 if (geneve->cfg.inner_proto_inherit &&
1801 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1802 goto nla_put_failure;
1803
1804 return 0;
1805
1806nla_put_failure:
1807 return -EMSGSIZE;
1808}
1809
1810static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1811 .kind = "geneve",
1812 .maxtype = IFLA_GENEVE_MAX,
1813 .policy = geneve_policy,
1814 .priv_size = sizeof(struct geneve_dev),
1815 .setup = geneve_setup,
1816 .validate = geneve_validate,
1817 .newlink = geneve_newlink,
1818 .changelink = geneve_changelink,
1819 .dellink = geneve_dellink,
1820 .get_size = geneve_get_size,
1821 .fill_info = geneve_fill_info,
1822};
1823
1824struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1825 u8 name_assign_type, u16 dst_port)
1826{
1827 struct nlattr *tb[IFLA_MAX + 1];
1828 struct net_device *dev;
1829 LIST_HEAD(list_kill);
1830 int err;
1831 struct geneve_config cfg = {
1832 .df = GENEVE_DF_UNSET,
1833 .use_udp6_rx_checksums = true,
1834 .ttl_inherit = false,
1835 .collect_md = true,
1836 };
1837
1838 memset(tb, 0, sizeof(tb));
1839 dev = rtnl_create_link(net, name, name_assign_type,
1840 &geneve_link_ops, tb, NULL);
1841 if (IS_ERR(dev))
1842 return dev;
1843
1844 init_tnl_info(&cfg.info, dst_port);
1845 err = geneve_configure(net, dev, NULL, &cfg);
1846 if (err) {
1847 free_netdev(dev);
1848 return ERR_PTR(err);
1849 }
1850
1851 /* openvswitch users expect packet sizes to be unrestricted,
1852 * so set the largest MTU we can.
1853 */
1854 err = geneve_change_mtu(dev, IP_MAX_MTU);
1855 if (err)
1856 goto err;
1857
1858 err = rtnl_configure_link(dev, NULL, 0, NULL);
1859 if (err < 0)
1860 goto err;
1861
1862 return dev;
1863err:
1864 geneve_dellink(dev, &list_kill);
1865 unregister_netdevice_many(&list_kill);
1866 return ERR_PTR(err);
1867}
1868EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1869
1870static int geneve_netdevice_event(struct notifier_block *unused,
1871 unsigned long event, void *ptr)
1872{
1873 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1874
1875 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1876 geneve_offload_rx_ports(dev, true);
1877 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1878 geneve_offload_rx_ports(dev, false);
1879
1880 return NOTIFY_DONE;
1881}
1882
1883static struct notifier_block geneve_notifier_block __read_mostly = {
1884 .notifier_call = geneve_netdevice_event,
1885};
1886
1887static __net_init int geneve_init_net(struct net *net)
1888{
1889 struct geneve_net *gn = net_generic(net, geneve_net_id);
1890
1891 INIT_LIST_HEAD(&gn->geneve_list);
1892 INIT_LIST_HEAD(&gn->sock_list);
1893 return 0;
1894}
1895
1896static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1897{
1898 struct geneve_net *gn = net_generic(net, geneve_net_id);
1899 struct geneve_dev *geneve, *next;
1900 struct net_device *dev, *aux;
1901
1902 /* gather any geneve devices that were moved into this ns */
1903 for_each_netdev_safe(net, dev, aux)
1904 if (dev->rtnl_link_ops == &geneve_link_ops)
1905 unregister_netdevice_queue(dev, head);
1906
1907 /* now gather any other geneve devices that were created in this ns */
1908 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1909 /* If geneve->dev is in the same netns, it was already added
1910 * to the list by the previous loop.
1911 */
1912 if (!net_eq(dev_net(geneve->dev), net))
1913 unregister_netdevice_queue(geneve->dev, head);
1914 }
1915}
1916
1917static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1918{
1919 struct net *net;
1920 LIST_HEAD(list);
1921
1922 rtnl_lock();
1923 list_for_each_entry(net, net_list, exit_list)
1924 geneve_destroy_tunnels(net, &list);
1925
1926 /* unregister the devices gathered above */
1927 unregister_netdevice_many(&list);
1928 rtnl_unlock();
1929
1930 list_for_each_entry(net, net_list, exit_list) {
1931 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1932
1933 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1934 }
1935}
1936
1937static struct pernet_operations geneve_net_ops = {
1938 .init = geneve_init_net,
1939 .exit_batch = geneve_exit_batch_net,
1940 .id = &geneve_net_id,
1941 .size = sizeof(struct geneve_net),
1942};
1943
1944static int __init geneve_init_module(void)
1945{
1946 int rc;
1947
1948 rc = register_pernet_subsys(&geneve_net_ops);
1949 if (rc)
1950 goto out1;
1951
1952 rc = register_netdevice_notifier(&geneve_notifier_block);
1953 if (rc)
1954 goto out2;
1955
1956 rc = rtnl_link_register(&geneve_link_ops);
1957 if (rc)
1958 goto out3;
1959
1960 return 0;
1961out3:
1962 unregister_netdevice_notifier(&geneve_notifier_block);
1963out2:
1964 unregister_pernet_subsys(&geneve_net_ops);
1965out1:
1966 return rc;
1967}
1968late_initcall(geneve_init_module);
1969
1970static void __exit geneve_cleanup_module(void)
1971{
1972 rtnl_link_unregister(&geneve_link_ops);
1973 unregister_netdevice_notifier(&geneve_notifier_block);
1974 unregister_pernet_subsys(&geneve_net_ops);
1975}
1976module_exit(geneve_cleanup_module);
1977
1978MODULE_LICENSE("GPL");
1979MODULE_VERSION(GENEVE_NETDEV_VER);
1980MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1981MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1982MODULE_ALIAS_RTNL_LINK("geneve");
1/*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
17#include <linux/hash.h>
18#include <net/dst_metadata.h>
19#include <net/gro_cells.h>
20#include <net/rtnetlink.h>
21#include <net/geneve.h>
22#include <net/protocol.h>
23
24#define GENEVE_NETDEV_VER "0.6"
25
26#define GENEVE_UDP_PORT 6081
27
28#define GENEVE_N_VID (1u << 24)
29#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
30
31#define VNI_HASH_BITS 10
32#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33
34static bool log_ecn_error = true;
35module_param(log_ecn_error, bool, 0644);
36MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
37
38#define GENEVE_VER 0
39#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
40
41/* per-network namespace private data for this module */
42struct geneve_net {
43 struct list_head geneve_list;
44 struct list_head sock_list;
45};
46
47static int geneve_net_id;
48
49union geneve_addr {
50 struct sockaddr_in sin;
51 struct sockaddr_in6 sin6;
52 struct sockaddr sa;
53};
54
55static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
56
57/* Pseudo network device */
58struct geneve_dev {
59 struct hlist_node hlist; /* vni hash table */
60 struct net *net; /* netns for packet i/o */
61 struct net_device *dev; /* netdev for geneve tunnel */
62 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
63#if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
65#endif
66 u8 vni[3]; /* virtual network ID for tunnel */
67 u8 ttl; /* TTL override */
68 u8 tos; /* TOS override */
69 union geneve_addr remote; /* IP address for link partner */
70 struct list_head next; /* geneve's per namespace list */
71 __be32 label; /* IPv6 flowlabel override */
72 __be16 dst_port;
73 bool collect_md;
74 struct gro_cells gro_cells;
75 u32 flags;
76 struct dst_cache dst_cache;
77};
78
79/* Geneve device flags */
80#define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
81#define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
82#define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
83
84struct geneve_sock {
85 bool collect_md;
86 struct list_head list;
87 struct socket *sock;
88 struct rcu_head rcu;
89 int refcnt;
90 struct udp_offload udp_offloads;
91 struct hlist_head vni_list[VNI_HASH_SIZE];
92 u32 flags;
93};
94
95static inline __u32 geneve_net_vni_hash(u8 vni[3])
96{
97 __u32 vnid;
98
99 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
100 return hash_32(vnid, VNI_HASH_BITS);
101}
102
103static __be64 vni_to_tunnel_id(const __u8 *vni)
104{
105#ifdef __BIG_ENDIAN
106 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
107#else
108 return (__force __be64)(((__force u64)vni[0] << 40) |
109 ((__force u64)vni[1] << 48) |
110 ((__force u64)vni[2] << 56));
111#endif
112}
113
114static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
115{
116 return gs->sock->sk->sk_family;
117}
118
119static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
120 __be32 addr, u8 vni[])
121{
122 struct hlist_head *vni_list_head;
123 struct geneve_dev *geneve;
124 __u32 hash;
125
126 /* Find the device for this VNI */
127 hash = geneve_net_vni_hash(vni);
128 vni_list_head = &gs->vni_list[hash];
129 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
130 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
131 addr == geneve->remote.sin.sin_addr.s_addr)
132 return geneve;
133 }
134 return NULL;
135}
136
137#if IS_ENABLED(CONFIG_IPV6)
138static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
139 struct in6_addr addr6, u8 vni[])
140{
141 struct hlist_head *vni_list_head;
142 struct geneve_dev *geneve;
143 __u32 hash;
144
145 /* Find the device for this VNI */
146 hash = geneve_net_vni_hash(vni);
147 vni_list_head = &gs->vni_list[hash];
148 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
149 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
150 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
151 return geneve;
152 }
153 return NULL;
154}
155#endif
156
157static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
158{
159 return (struct genevehdr *)(udp_hdr(skb) + 1);
160}
161
162static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
163 struct sk_buff *skb)
164{
165 u8 *vni;
166 __be32 addr;
167 static u8 zero_vni[3];
168#if IS_ENABLED(CONFIG_IPV6)
169 static struct in6_addr zero_addr6;
170#endif
171
172 if (geneve_get_sk_family(gs) == AF_INET) {
173 struct iphdr *iph;
174
175 iph = ip_hdr(skb); /* outer IP header... */
176
177 if (gs->collect_md) {
178 vni = zero_vni;
179 addr = 0;
180 } else {
181 vni = geneve_hdr(skb)->vni;
182 addr = iph->saddr;
183 }
184
185 return geneve_lookup(gs, addr, vni);
186#if IS_ENABLED(CONFIG_IPV6)
187 } else if (geneve_get_sk_family(gs) == AF_INET6) {
188 struct ipv6hdr *ip6h;
189 struct in6_addr addr6;
190
191 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
192
193 if (gs->collect_md) {
194 vni = zero_vni;
195 addr6 = zero_addr6;
196 } else {
197 vni = geneve_hdr(skb)->vni;
198 addr6 = ip6h->saddr;
199 }
200
201 return geneve6_lookup(gs, addr6, vni);
202#endif
203 }
204 return NULL;
205}
206
207/* geneve receive/decap routine */
208static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
209 struct sk_buff *skb)
210{
211 struct genevehdr *gnvh = geneve_hdr(skb);
212 struct metadata_dst *tun_dst = NULL;
213 struct pcpu_sw_netstats *stats;
214 int err = 0;
215 void *oiph;
216
217 if (ip_tunnel_collect_metadata() || gs->collect_md) {
218 __be16 flags;
219
220 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
221 (gnvh->oam ? TUNNEL_OAM : 0) |
222 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
223
224 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
225 vni_to_tunnel_id(gnvh->vni),
226 gnvh->opt_len * 4);
227 if (!tun_dst)
228 goto drop;
229 /* Update tunnel dst according to Geneve options. */
230 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
231 gnvh->options, gnvh->opt_len * 4);
232 } else {
233 /* Drop packets w/ critical options,
234 * since we don't support any...
235 */
236 if (gnvh->critical)
237 goto drop;
238 }
239
240 skb_reset_mac_header(skb);
241 skb->protocol = eth_type_trans(skb, geneve->dev);
242 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
243
244 if (tun_dst)
245 skb_dst_set(skb, &tun_dst->dst);
246
247 /* Ignore packet loops (and multicast echo) */
248 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
249 goto drop;
250
251 oiph = skb_network_header(skb);
252 skb_reset_network_header(skb);
253
254 if (geneve_get_sk_family(gs) == AF_INET)
255 err = IP_ECN_decapsulate(oiph, skb);
256#if IS_ENABLED(CONFIG_IPV6)
257 else
258 err = IP6_ECN_decapsulate(oiph, skb);
259#endif
260
261 if (unlikely(err)) {
262 if (log_ecn_error) {
263 if (geneve_get_sk_family(gs) == AF_INET)
264 net_info_ratelimited("non-ECT from %pI4 "
265 "with TOS=%#x\n",
266 &((struct iphdr *)oiph)->saddr,
267 ((struct iphdr *)oiph)->tos);
268#if IS_ENABLED(CONFIG_IPV6)
269 else
270 net_info_ratelimited("non-ECT from %pI6\n",
271 &((struct ipv6hdr *)oiph)->saddr);
272#endif
273 }
274 if (err > 1) {
275 ++geneve->dev->stats.rx_frame_errors;
276 ++geneve->dev->stats.rx_errors;
277 goto drop;
278 }
279 }
280
281 stats = this_cpu_ptr(geneve->dev->tstats);
282 u64_stats_update_begin(&stats->syncp);
283 stats->rx_packets++;
284 stats->rx_bytes += skb->len;
285 u64_stats_update_end(&stats->syncp);
286
287 gro_cells_receive(&geneve->gro_cells, skb);
288 return;
289drop:
290 /* Consume bad packet */
291 kfree_skb(skb);
292}
293
294/* Setup stats when device is created */
295static int geneve_init(struct net_device *dev)
296{
297 struct geneve_dev *geneve = netdev_priv(dev);
298 int err;
299
300 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
301 if (!dev->tstats)
302 return -ENOMEM;
303
304 err = gro_cells_init(&geneve->gro_cells, dev);
305 if (err) {
306 free_percpu(dev->tstats);
307 return err;
308 }
309
310 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
311 if (err) {
312 free_percpu(dev->tstats);
313 gro_cells_destroy(&geneve->gro_cells);
314 return err;
315 }
316
317 return 0;
318}
319
320static void geneve_uninit(struct net_device *dev)
321{
322 struct geneve_dev *geneve = netdev_priv(dev);
323
324 dst_cache_destroy(&geneve->dst_cache);
325 gro_cells_destroy(&geneve->gro_cells);
326 free_percpu(dev->tstats);
327}
328
329/* Callback from net/ipv4/udp.c to receive packets */
330static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
331{
332 struct genevehdr *geneveh;
333 struct geneve_dev *geneve;
334 struct geneve_sock *gs;
335 int opts_len;
336
337 /* Need Geneve and inner Ethernet header to be present */
338 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
339 goto error;
340
341 /* Return packets with reserved bits set */
342 geneveh = geneve_hdr(skb);
343 if (unlikely(geneveh->ver != GENEVE_VER))
344 goto error;
345
346 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
347 goto error;
348
349 gs = rcu_dereference_sk_user_data(sk);
350 if (!gs)
351 goto drop;
352
353 geneve = geneve_lookup_skb(gs, skb);
354 if (!geneve)
355 goto drop;
356
357 opts_len = geneveh->opt_len * 4;
358 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
359 htons(ETH_P_TEB),
360 !net_eq(geneve->net, dev_net(geneve->dev))))
361 goto drop;
362
363 geneve_rx(geneve, gs, skb);
364 return 0;
365
366drop:
367 /* Consume bad packet */
368 kfree_skb(skb);
369 return 0;
370
371error:
372 /* Let the UDP layer deal with the skb */
373 return 1;
374}
375
376static struct socket *geneve_create_sock(struct net *net, bool ipv6,
377 __be16 port, u32 flags)
378{
379 struct socket *sock;
380 struct udp_port_cfg udp_conf;
381 int err;
382
383 memset(&udp_conf, 0, sizeof(udp_conf));
384
385 if (ipv6) {
386 udp_conf.family = AF_INET6;
387 udp_conf.ipv6_v6only = 1;
388 udp_conf.use_udp6_rx_checksums =
389 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
390 } else {
391 udp_conf.family = AF_INET;
392 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
393 }
394
395 udp_conf.local_udp_port = port;
396
397 /* Open UDP socket */
398 err = udp_sock_create(net, &udp_conf, &sock);
399 if (err < 0)
400 return ERR_PTR(err);
401
402 return sock;
403}
404
405static void geneve_notify_add_rx_port(struct geneve_sock *gs)
406{
407 struct net_device *dev;
408 struct sock *sk = gs->sock->sk;
409 struct net *net = sock_net(sk);
410 sa_family_t sa_family = geneve_get_sk_family(gs);
411 __be16 port = inet_sk(sk)->inet_sport;
412 int err;
413
414 if (sa_family == AF_INET) {
415 err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
416 if (err)
417 pr_warn("geneve: udp_add_offload failed with status %d\n",
418 err);
419 }
420
421 rcu_read_lock();
422 for_each_netdev_rcu(net, dev) {
423 if (dev->netdev_ops->ndo_add_geneve_port)
424 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
425 port);
426 }
427 rcu_read_unlock();
428}
429
430static int geneve_hlen(struct genevehdr *gh)
431{
432 return sizeof(*gh) + gh->opt_len * 4;
433}
434
435static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
436 struct sk_buff *skb,
437 struct udp_offload *uoff)
438{
439 struct sk_buff *p, **pp = NULL;
440 struct genevehdr *gh, *gh2;
441 unsigned int hlen, gh_len, off_gnv;
442 const struct packet_offload *ptype;
443 __be16 type;
444 int flush = 1;
445
446 off_gnv = skb_gro_offset(skb);
447 hlen = off_gnv + sizeof(*gh);
448 gh = skb_gro_header_fast(skb, off_gnv);
449 if (skb_gro_header_hard(skb, hlen)) {
450 gh = skb_gro_header_slow(skb, hlen, off_gnv);
451 if (unlikely(!gh))
452 goto out;
453 }
454
455 if (gh->ver != GENEVE_VER || gh->oam)
456 goto out;
457 gh_len = geneve_hlen(gh);
458
459 hlen = off_gnv + gh_len;
460 if (skb_gro_header_hard(skb, hlen)) {
461 gh = skb_gro_header_slow(skb, hlen, off_gnv);
462 if (unlikely(!gh))
463 goto out;
464 }
465
466 for (p = *head; p; p = p->next) {
467 if (!NAPI_GRO_CB(p)->same_flow)
468 continue;
469
470 gh2 = (struct genevehdr *)(p->data + off_gnv);
471 if (gh->opt_len != gh2->opt_len ||
472 memcmp(gh, gh2, gh_len)) {
473 NAPI_GRO_CB(p)->same_flow = 0;
474 continue;
475 }
476 }
477
478 type = gh->proto_type;
479
480 rcu_read_lock();
481 ptype = gro_find_receive_by_type(type);
482 if (!ptype)
483 goto out_unlock;
484
485 skb_gro_pull(skb, gh_len);
486 skb_gro_postpull_rcsum(skb, gh, gh_len);
487 pp = ptype->callbacks.gro_receive(head, skb);
488 flush = 0;
489
490out_unlock:
491 rcu_read_unlock();
492out:
493 NAPI_GRO_CB(skb)->flush |= flush;
494
495 return pp;
496}
497
498static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
499 struct udp_offload *uoff)
500{
501 struct genevehdr *gh;
502 struct packet_offload *ptype;
503 __be16 type;
504 int gh_len;
505 int err = -ENOSYS;
506
507 gh = (struct genevehdr *)(skb->data + nhoff);
508 gh_len = geneve_hlen(gh);
509 type = gh->proto_type;
510
511 rcu_read_lock();
512 ptype = gro_find_complete_by_type(type);
513 if (ptype)
514 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
515
516 rcu_read_unlock();
517
518 skb_set_inner_mac_header(skb, nhoff + gh_len);
519
520 return err;
521}
522
523/* Create new listen socket if needed */
524static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
525 bool ipv6, u32 flags)
526{
527 struct geneve_net *gn = net_generic(net, geneve_net_id);
528 struct geneve_sock *gs;
529 struct socket *sock;
530 struct udp_tunnel_sock_cfg tunnel_cfg;
531 int h;
532
533 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
534 if (!gs)
535 return ERR_PTR(-ENOMEM);
536
537 sock = geneve_create_sock(net, ipv6, port, flags);
538 if (IS_ERR(sock)) {
539 kfree(gs);
540 return ERR_CAST(sock);
541 }
542
543 gs->sock = sock;
544 gs->refcnt = 1;
545 for (h = 0; h < VNI_HASH_SIZE; ++h)
546 INIT_HLIST_HEAD(&gs->vni_list[h]);
547
548 /* Initialize the geneve udp offloads structure */
549 gs->udp_offloads.port = port;
550 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
551 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
552 geneve_notify_add_rx_port(gs);
553
554 /* Mark socket as an encapsulation socket */
555 tunnel_cfg.sk_user_data = gs;
556 tunnel_cfg.encap_type = 1;
557 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
558 tunnel_cfg.encap_destroy = NULL;
559 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
560 list_add(&gs->list, &gn->sock_list);
561 return gs;
562}
563
564static void geneve_notify_del_rx_port(struct geneve_sock *gs)
565{
566 struct net_device *dev;
567 struct sock *sk = gs->sock->sk;
568 struct net *net = sock_net(sk);
569 sa_family_t sa_family = geneve_get_sk_family(gs);
570 __be16 port = inet_sk(sk)->inet_sport;
571
572 rcu_read_lock();
573 for_each_netdev_rcu(net, dev) {
574 if (dev->netdev_ops->ndo_del_geneve_port)
575 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
576 port);
577 }
578
579 rcu_read_unlock();
580
581 if (sa_family == AF_INET)
582 udp_del_offload(&gs->udp_offloads);
583}
584
585static void __geneve_sock_release(struct geneve_sock *gs)
586{
587 if (!gs || --gs->refcnt)
588 return;
589
590 list_del(&gs->list);
591 geneve_notify_del_rx_port(gs);
592 udp_tunnel_sock_release(gs->sock);
593 kfree_rcu(gs, rcu);
594}
595
596static void geneve_sock_release(struct geneve_dev *geneve)
597{
598 __geneve_sock_release(geneve->sock4);
599#if IS_ENABLED(CONFIG_IPV6)
600 __geneve_sock_release(geneve->sock6);
601#endif
602}
603
604static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
605 sa_family_t family,
606 __be16 dst_port)
607{
608 struct geneve_sock *gs;
609
610 list_for_each_entry(gs, &gn->sock_list, list) {
611 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
612 geneve_get_sk_family(gs) == family) {
613 return gs;
614 }
615 }
616 return NULL;
617}
618
619static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
620{
621 struct net *net = geneve->net;
622 struct geneve_net *gn = net_generic(net, geneve_net_id);
623 struct geneve_sock *gs;
624 __u32 hash;
625
626 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
627 if (gs) {
628 gs->refcnt++;
629 goto out;
630 }
631
632 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
633 if (IS_ERR(gs))
634 return PTR_ERR(gs);
635
636out:
637 gs->collect_md = geneve->collect_md;
638 gs->flags = geneve->flags;
639#if IS_ENABLED(CONFIG_IPV6)
640 if (ipv6)
641 geneve->sock6 = gs;
642 else
643#endif
644 geneve->sock4 = gs;
645
646 hash = geneve_net_vni_hash(geneve->vni);
647 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
648 return 0;
649}
650
651static int geneve_open(struct net_device *dev)
652{
653 struct geneve_dev *geneve = netdev_priv(dev);
654 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
655 bool metadata = geneve->collect_md;
656 int ret = 0;
657
658 geneve->sock4 = NULL;
659#if IS_ENABLED(CONFIG_IPV6)
660 geneve->sock6 = NULL;
661 if (ipv6 || metadata)
662 ret = geneve_sock_add(geneve, true);
663#endif
664 if (!ret && (!ipv6 || metadata))
665 ret = geneve_sock_add(geneve, false);
666 if (ret < 0)
667 geneve_sock_release(geneve);
668
669 return ret;
670}
671
672static int geneve_stop(struct net_device *dev)
673{
674 struct geneve_dev *geneve = netdev_priv(dev);
675
676 if (!hlist_unhashed(&geneve->hlist))
677 hlist_del_rcu(&geneve->hlist);
678 geneve_sock_release(geneve);
679 return 0;
680}
681
682static void geneve_build_header(struct genevehdr *geneveh,
683 __be16 tun_flags, u8 vni[3],
684 u8 options_len, u8 *options)
685{
686 geneveh->ver = GENEVE_VER;
687 geneveh->opt_len = options_len / 4;
688 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
689 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
690 geneveh->rsvd1 = 0;
691 memcpy(geneveh->vni, vni, 3);
692 geneveh->proto_type = htons(ETH_P_TEB);
693 geneveh->rsvd2 = 0;
694
695 memcpy(geneveh->options, options, options_len);
696}
697
698static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
699 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
700 u32 flags, bool xnet)
701{
702 struct genevehdr *gnvh;
703 int min_headroom;
704 int err;
705 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
706
707 skb_scrub_packet(skb, xnet);
708
709 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
710 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
711 err = skb_cow_head(skb, min_headroom);
712 if (unlikely(err)) {
713 kfree_skb(skb);
714 goto free_rt;
715 }
716
717 skb = udp_tunnel_handle_offloads(skb, udp_sum);
718 if (IS_ERR(skb)) {
719 err = PTR_ERR(skb);
720 goto free_rt;
721 }
722
723 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
724 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
725
726 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
727 return 0;
728
729free_rt:
730 ip_rt_put(rt);
731 return err;
732}
733
734#if IS_ENABLED(CONFIG_IPV6)
735static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
736 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
737 u32 flags, bool xnet)
738{
739 struct genevehdr *gnvh;
740 int min_headroom;
741 int err;
742 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
743
744 skb_scrub_packet(skb, xnet);
745
746 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
747 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
748 err = skb_cow_head(skb, min_headroom);
749 if (unlikely(err)) {
750 kfree_skb(skb);
751 goto free_dst;
752 }
753
754 skb = udp_tunnel_handle_offloads(skb, udp_sum);
755 if (IS_ERR(skb)) {
756 err = PTR_ERR(skb);
757 goto free_dst;
758 }
759
760 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
761 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
762
763 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
764 return 0;
765
766free_dst:
767 dst_release(dst);
768 return err;
769}
770#endif
771
772static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
773 struct net_device *dev,
774 struct flowi4 *fl4,
775 struct ip_tunnel_info *info)
776{
777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
778 struct geneve_dev *geneve = netdev_priv(dev);
779 struct dst_cache *dst_cache;
780 struct rtable *rt = NULL;
781 __u8 tos;
782
783 memset(fl4, 0, sizeof(*fl4));
784 fl4->flowi4_mark = skb->mark;
785 fl4->flowi4_proto = IPPROTO_UDP;
786
787 if (info) {
788 fl4->daddr = info->key.u.ipv4.dst;
789 fl4->saddr = info->key.u.ipv4.src;
790 fl4->flowi4_tos = RT_TOS(info->key.tos);
791 dst_cache = &info->dst_cache;
792 } else {
793 tos = geneve->tos;
794 if (tos == 1) {
795 const struct iphdr *iip = ip_hdr(skb);
796
797 tos = ip_tunnel_get_dsfield(iip, skb);
798 use_cache = false;
799 }
800
801 fl4->flowi4_tos = RT_TOS(tos);
802 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
803 dst_cache = &geneve->dst_cache;
804 }
805
806 if (use_cache) {
807 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
808 if (rt)
809 return rt;
810 }
811
812 rt = ip_route_output_key(geneve->net, fl4);
813 if (IS_ERR(rt)) {
814 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
815 return ERR_PTR(-ENETUNREACH);
816 }
817 if (rt->dst.dev == dev) { /* is this necessary? */
818 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
819 ip_rt_put(rt);
820 return ERR_PTR(-ELOOP);
821 }
822 if (use_cache)
823 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
824 return rt;
825}
826
827#if IS_ENABLED(CONFIG_IPV6)
828static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
829 struct net_device *dev,
830 struct flowi6 *fl6,
831 struct ip_tunnel_info *info)
832{
833 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
834 struct geneve_dev *geneve = netdev_priv(dev);
835 struct geneve_sock *gs6 = geneve->sock6;
836 struct dst_entry *dst = NULL;
837 struct dst_cache *dst_cache;
838 __u8 prio;
839
840 memset(fl6, 0, sizeof(*fl6));
841 fl6->flowi6_mark = skb->mark;
842 fl6->flowi6_proto = IPPROTO_UDP;
843
844 if (info) {
845 fl6->daddr = info->key.u.ipv6.dst;
846 fl6->saddr = info->key.u.ipv6.src;
847 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
848 info->key.label);
849 dst_cache = &info->dst_cache;
850 } else {
851 prio = geneve->tos;
852 if (prio == 1) {
853 const struct iphdr *iip = ip_hdr(skb);
854
855 prio = ip_tunnel_get_dsfield(iip, skb);
856 use_cache = false;
857 }
858
859 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
860 geneve->label);
861 fl6->daddr = geneve->remote.sin6.sin6_addr;
862 dst_cache = &geneve->dst_cache;
863 }
864
865 if (use_cache) {
866 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
867 if (dst)
868 return dst;
869 }
870
871 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
872 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
873 return ERR_PTR(-ENETUNREACH);
874 }
875 if (dst->dev == dev) { /* is this necessary? */
876 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
877 dst_release(dst);
878 return ERR_PTR(-ELOOP);
879 }
880
881 if (use_cache)
882 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
883 return dst;
884}
885#endif
886
887/* Convert 64 bit tunnel ID to 24 bit VNI. */
888static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
889{
890#ifdef __BIG_ENDIAN
891 vni[0] = (__force __u8)(tun_id >> 16);
892 vni[1] = (__force __u8)(tun_id >> 8);
893 vni[2] = (__force __u8)tun_id;
894#else
895 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
896 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
897 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
898#endif
899}
900
901static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
902 struct ip_tunnel_info *info)
903{
904 struct geneve_dev *geneve = netdev_priv(dev);
905 struct geneve_sock *gs4 = geneve->sock4;
906 struct rtable *rt = NULL;
907 const struct iphdr *iip; /* interior IP header */
908 int err = -EINVAL;
909 struct flowi4 fl4;
910 __u8 tos, ttl;
911 __be16 sport;
912 __be16 df;
913 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
914 u32 flags = geneve->flags;
915
916 if (geneve->collect_md) {
917 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
918 netdev_dbg(dev, "no tunnel metadata\n");
919 goto tx_error;
920 }
921 if (info && ip_tunnel_info_af(info) != AF_INET)
922 goto tx_error;
923 }
924
925 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
926 if (IS_ERR(rt)) {
927 err = PTR_ERR(rt);
928 goto tx_error;
929 }
930
931 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
932 skb_reset_mac_header(skb);
933
934 iip = ip_hdr(skb);
935
936 if (info) {
937 const struct ip_tunnel_key *key = &info->key;
938 u8 *opts = NULL;
939 u8 vni[3];
940
941 tunnel_id_to_vni(key->tun_id, vni);
942 if (info->options_len)
943 opts = ip_tunnel_info_opts(info);
944
945 if (key->tun_flags & TUNNEL_CSUM)
946 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
947 else
948 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
949
950 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
951 info->options_len, opts, flags, xnet);
952 if (unlikely(err))
953 goto err;
954
955 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
956 ttl = key->ttl;
957 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
958 } else {
959 err = geneve_build_skb(rt, skb, 0, geneve->vni,
960 0, NULL, flags, xnet);
961 if (unlikely(err))
962 goto err;
963
964 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
965 ttl = geneve->ttl;
966 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
967 ttl = 1;
968 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
969 df = 0;
970 }
971 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
972 tos, ttl, df, sport, geneve->dst_port,
973 !net_eq(geneve->net, dev_net(geneve->dev)),
974 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
975
976 return NETDEV_TX_OK;
977
978tx_error:
979 dev_kfree_skb(skb);
980err:
981 if (err == -ELOOP)
982 dev->stats.collisions++;
983 else if (err == -ENETUNREACH)
984 dev->stats.tx_carrier_errors++;
985 else
986 dev->stats.tx_errors++;
987 return NETDEV_TX_OK;
988}
989
990#if IS_ENABLED(CONFIG_IPV6)
991static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
992 struct ip_tunnel_info *info)
993{
994 struct geneve_dev *geneve = netdev_priv(dev);
995 struct geneve_sock *gs6 = geneve->sock6;
996 struct dst_entry *dst = NULL;
997 const struct iphdr *iip; /* interior IP header */
998 int err = -EINVAL;
999 struct flowi6 fl6;
1000 __u8 prio, ttl;
1001 __be16 sport;
1002 __be32 label;
1003 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1004 u32 flags = geneve->flags;
1005
1006 if (geneve->collect_md) {
1007 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1008 netdev_dbg(dev, "no tunnel metadata\n");
1009 goto tx_error;
1010 }
1011 }
1012
1013 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1014 if (IS_ERR(dst)) {
1015 err = PTR_ERR(dst);
1016 goto tx_error;
1017 }
1018
1019 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1020 skb_reset_mac_header(skb);
1021
1022 iip = ip_hdr(skb);
1023
1024 if (info) {
1025 const struct ip_tunnel_key *key = &info->key;
1026 u8 *opts = NULL;
1027 u8 vni[3];
1028
1029 tunnel_id_to_vni(key->tun_id, vni);
1030 if (info->options_len)
1031 opts = ip_tunnel_info_opts(info);
1032
1033 if (key->tun_flags & TUNNEL_CSUM)
1034 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1035 else
1036 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1037
1038 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1039 info->options_len, opts,
1040 flags, xnet);
1041 if (unlikely(err))
1042 goto err;
1043
1044 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1045 ttl = key->ttl;
1046 label = info->key.label;
1047 } else {
1048 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1049 0, NULL, flags, xnet);
1050 if (unlikely(err))
1051 goto err;
1052
1053 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1054 iip, skb);
1055 ttl = geneve->ttl;
1056 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1057 ttl = 1;
1058 ttl = ttl ? : ip6_dst_hoplimit(dst);
1059 label = geneve->label;
1060 }
1061
1062 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1063 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1064 sport, geneve->dst_port,
1065 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1066 return NETDEV_TX_OK;
1067
1068tx_error:
1069 dev_kfree_skb(skb);
1070err:
1071 if (err == -ELOOP)
1072 dev->stats.collisions++;
1073 else if (err == -ENETUNREACH)
1074 dev->stats.tx_carrier_errors++;
1075 else
1076 dev->stats.tx_errors++;
1077 return NETDEV_TX_OK;
1078}
1079#endif
1080
1081static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1082{
1083 struct geneve_dev *geneve = netdev_priv(dev);
1084 struct ip_tunnel_info *info = NULL;
1085
1086 if (geneve->collect_md)
1087 info = skb_tunnel_info(skb);
1088
1089#if IS_ENABLED(CONFIG_IPV6)
1090 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1091 (!info && geneve->remote.sa.sa_family == AF_INET6))
1092 return geneve6_xmit_skb(skb, dev, info);
1093#endif
1094 return geneve_xmit_skb(skb, dev, info);
1095}
1096
1097static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1098{
1099 /* The max_mtu calculation does not take account of GENEVE
1100 * options, to avoid excluding potentially valid
1101 * configurations.
1102 */
1103 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1104 - dev->hard_header_len;
1105
1106 if (new_mtu < 68)
1107 return -EINVAL;
1108
1109 if (new_mtu > max_mtu) {
1110 if (strict)
1111 return -EINVAL;
1112
1113 new_mtu = max_mtu;
1114 }
1115
1116 dev->mtu = new_mtu;
1117 return 0;
1118}
1119
1120static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1121{
1122 return __geneve_change_mtu(dev, new_mtu, true);
1123}
1124
1125static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1126{
1127 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1128 struct geneve_dev *geneve = netdev_priv(dev);
1129 struct rtable *rt;
1130 struct flowi4 fl4;
1131#if IS_ENABLED(CONFIG_IPV6)
1132 struct dst_entry *dst;
1133 struct flowi6 fl6;
1134#endif
1135
1136 if (ip_tunnel_info_af(info) == AF_INET) {
1137 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1138 if (IS_ERR(rt))
1139 return PTR_ERR(rt);
1140
1141 ip_rt_put(rt);
1142 info->key.u.ipv4.src = fl4.saddr;
1143#if IS_ENABLED(CONFIG_IPV6)
1144 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1145 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1146 if (IS_ERR(dst))
1147 return PTR_ERR(dst);
1148
1149 dst_release(dst);
1150 info->key.u.ipv6.src = fl6.saddr;
1151#endif
1152 } else {
1153 return -EINVAL;
1154 }
1155
1156 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1157 1, USHRT_MAX, true);
1158 info->key.tp_dst = geneve->dst_port;
1159 return 0;
1160}
1161
1162static const struct net_device_ops geneve_netdev_ops = {
1163 .ndo_init = geneve_init,
1164 .ndo_uninit = geneve_uninit,
1165 .ndo_open = geneve_open,
1166 .ndo_stop = geneve_stop,
1167 .ndo_start_xmit = geneve_xmit,
1168 .ndo_get_stats64 = ip_tunnel_get_stats64,
1169 .ndo_change_mtu = geneve_change_mtu,
1170 .ndo_validate_addr = eth_validate_addr,
1171 .ndo_set_mac_address = eth_mac_addr,
1172 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1173};
1174
1175static void geneve_get_drvinfo(struct net_device *dev,
1176 struct ethtool_drvinfo *drvinfo)
1177{
1178 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1179 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1180}
1181
1182static const struct ethtool_ops geneve_ethtool_ops = {
1183 .get_drvinfo = geneve_get_drvinfo,
1184 .get_link = ethtool_op_get_link,
1185};
1186
1187/* Info for udev, that this is a virtual tunnel endpoint */
1188static struct device_type geneve_type = {
1189 .name = "geneve",
1190};
1191
1192/* Calls the ndo_add_geneve_port of the caller in order to
1193 * supply the listening GENEVE udp ports. Callers are expected
1194 * to implement the ndo_add_geneve_port.
1195 */
1196void geneve_get_rx_port(struct net_device *dev)
1197{
1198 struct net *net = dev_net(dev);
1199 struct geneve_net *gn = net_generic(net, geneve_net_id);
1200 struct geneve_sock *gs;
1201 sa_family_t sa_family;
1202 struct sock *sk;
1203 __be16 port;
1204
1205 rcu_read_lock();
1206 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1207 sk = gs->sock->sk;
1208 sa_family = sk->sk_family;
1209 port = inet_sk(sk)->inet_sport;
1210 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1211 }
1212 rcu_read_unlock();
1213}
1214EXPORT_SYMBOL_GPL(geneve_get_rx_port);
1215
1216/* Initialize the device structure. */
1217static void geneve_setup(struct net_device *dev)
1218{
1219 ether_setup(dev);
1220
1221 dev->netdev_ops = &geneve_netdev_ops;
1222 dev->ethtool_ops = &geneve_ethtool_ops;
1223 dev->destructor = free_netdev;
1224
1225 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1226
1227 dev->features |= NETIF_F_LLTX;
1228 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1229 dev->features |= NETIF_F_RXCSUM;
1230 dev->features |= NETIF_F_GSO_SOFTWARE;
1231
1232 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1233 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1234
1235 netif_keep_dst(dev);
1236 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1238 eth_hw_addr_random(dev);
1239}
1240
1241static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1242 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1243 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1244 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1245 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1246 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1247 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1248 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1249 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1250 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1251 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1252 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1253};
1254
1255static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1256{
1257 if (tb[IFLA_ADDRESS]) {
1258 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1259 return -EINVAL;
1260
1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1262 return -EADDRNOTAVAIL;
1263 }
1264
1265 if (!data)
1266 return -EINVAL;
1267
1268 if (data[IFLA_GENEVE_ID]) {
1269 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1270
1271 if (vni >= GENEVE_VID_MASK)
1272 return -ERANGE;
1273 }
1274
1275 return 0;
1276}
1277
1278static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1279 __be16 dst_port,
1280 union geneve_addr *remote,
1281 u8 vni[],
1282 bool *tun_on_same_port,
1283 bool *tun_collect_md)
1284{
1285 struct geneve_dev *geneve, *t;
1286
1287 *tun_on_same_port = false;
1288 *tun_collect_md = false;
1289 t = NULL;
1290 list_for_each_entry(geneve, &gn->geneve_list, next) {
1291 if (geneve->dst_port == dst_port) {
1292 *tun_collect_md = geneve->collect_md;
1293 *tun_on_same_port = true;
1294 }
1295 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1296 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1297 dst_port == geneve->dst_port)
1298 t = geneve;
1299 }
1300 return t;
1301}
1302
1303static int geneve_configure(struct net *net, struct net_device *dev,
1304 union geneve_addr *remote,
1305 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1306 __be16 dst_port, bool metadata, u32 flags)
1307{
1308 struct geneve_net *gn = net_generic(net, geneve_net_id);
1309 struct geneve_dev *t, *geneve = netdev_priv(dev);
1310 bool tun_collect_md, tun_on_same_port;
1311 int err, encap_len;
1312
1313 if (!remote)
1314 return -EINVAL;
1315 if (metadata &&
1316 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1317 return -EINVAL;
1318
1319 geneve->net = net;
1320 geneve->dev = dev;
1321
1322 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1323 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1324 geneve->vni[2] = vni & 0x000000ff;
1325
1326 if ((remote->sa.sa_family == AF_INET &&
1327 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1328 (remote->sa.sa_family == AF_INET6 &&
1329 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1330 return -EINVAL;
1331 if (label && remote->sa.sa_family != AF_INET6)
1332 return -EINVAL;
1333
1334 geneve->remote = *remote;
1335
1336 geneve->ttl = ttl;
1337 geneve->tos = tos;
1338 geneve->label = label;
1339 geneve->dst_port = dst_port;
1340 geneve->collect_md = metadata;
1341 geneve->flags = flags;
1342
1343 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1344 &tun_on_same_port, &tun_collect_md);
1345 if (t)
1346 return -EBUSY;
1347
1348 /* make enough headroom for basic scenario */
1349 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1350 if (remote->sa.sa_family == AF_INET)
1351 encap_len += sizeof(struct iphdr);
1352 else
1353 encap_len += sizeof(struct ipv6hdr);
1354 dev->needed_headroom = encap_len + ETH_HLEN;
1355
1356 if (metadata) {
1357 if (tun_on_same_port)
1358 return -EPERM;
1359 } else {
1360 if (tun_collect_md)
1361 return -EPERM;
1362 }
1363
1364 dst_cache_reset(&geneve->dst_cache);
1365
1366 err = register_netdevice(dev);
1367 if (err)
1368 return err;
1369
1370 list_add(&geneve->next, &gn->geneve_list);
1371 return 0;
1372}
1373
1374static int geneve_newlink(struct net *net, struct net_device *dev,
1375 struct nlattr *tb[], struct nlattr *data[])
1376{
1377 __be16 dst_port = htons(GENEVE_UDP_PORT);
1378 __u8 ttl = 0, tos = 0;
1379 bool metadata = false;
1380 union geneve_addr remote = geneve_remote_unspec;
1381 __be32 label = 0;
1382 __u32 vni = 0;
1383 u32 flags = 0;
1384
1385 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1386 return -EINVAL;
1387
1388 if (data[IFLA_GENEVE_REMOTE]) {
1389 remote.sa.sa_family = AF_INET;
1390 remote.sin.sin_addr.s_addr =
1391 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1392 }
1393
1394 if (data[IFLA_GENEVE_REMOTE6]) {
1395 if (!IS_ENABLED(CONFIG_IPV6))
1396 return -EPFNOSUPPORT;
1397
1398 remote.sa.sa_family = AF_INET6;
1399 remote.sin6.sin6_addr =
1400 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1401
1402 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1403 IPV6_ADDR_LINKLOCAL) {
1404 netdev_dbg(dev, "link-local remote is unsupported\n");
1405 return -EINVAL;
1406 }
1407 }
1408
1409 if (data[IFLA_GENEVE_ID])
1410 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1411
1412 if (data[IFLA_GENEVE_TTL])
1413 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1414
1415 if (data[IFLA_GENEVE_TOS])
1416 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1417
1418 if (data[IFLA_GENEVE_LABEL])
1419 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1420 IPV6_FLOWLABEL_MASK;
1421
1422 if (data[IFLA_GENEVE_PORT])
1423 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1424
1425 if (data[IFLA_GENEVE_COLLECT_METADATA])
1426 metadata = true;
1427
1428 if (data[IFLA_GENEVE_UDP_CSUM] &&
1429 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1430 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1431
1432 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1433 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1434 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1435
1436 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1437 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1438 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1439
1440 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1441 dst_port, metadata, flags);
1442}
1443
1444static void geneve_dellink(struct net_device *dev, struct list_head *head)
1445{
1446 struct geneve_dev *geneve = netdev_priv(dev);
1447
1448 list_del(&geneve->next);
1449 unregister_netdevice_queue(dev, head);
1450}
1451
1452static size_t geneve_get_size(const struct net_device *dev)
1453{
1454 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1455 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1456 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1457 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1458 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1459 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1460 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1461 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1462 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1463 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1464 0;
1465}
1466
1467static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1468{
1469 struct geneve_dev *geneve = netdev_priv(dev);
1470 __u32 vni;
1471
1472 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1473 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1474 goto nla_put_failure;
1475
1476 if (geneve->remote.sa.sa_family == AF_INET) {
1477 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1478 geneve->remote.sin.sin_addr.s_addr))
1479 goto nla_put_failure;
1480#if IS_ENABLED(CONFIG_IPV6)
1481 } else {
1482 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1483 &geneve->remote.sin6.sin6_addr))
1484 goto nla_put_failure;
1485#endif
1486 }
1487
1488 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1489 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1490 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1491 goto nla_put_failure;
1492
1493 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1494 goto nla_put_failure;
1495
1496 if (geneve->collect_md) {
1497 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1498 goto nla_put_failure;
1499 }
1500
1501 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1502 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1503 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1504 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1505 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1506 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1507 goto nla_put_failure;
1508
1509 return 0;
1510
1511nla_put_failure:
1512 return -EMSGSIZE;
1513}
1514
1515static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1516 .kind = "geneve",
1517 .maxtype = IFLA_GENEVE_MAX,
1518 .policy = geneve_policy,
1519 .priv_size = sizeof(struct geneve_dev),
1520 .setup = geneve_setup,
1521 .validate = geneve_validate,
1522 .newlink = geneve_newlink,
1523 .dellink = geneve_dellink,
1524 .get_size = geneve_get_size,
1525 .fill_info = geneve_fill_info,
1526};
1527
1528struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1529 u8 name_assign_type, u16 dst_port)
1530{
1531 struct nlattr *tb[IFLA_MAX + 1];
1532 struct net_device *dev;
1533 int err;
1534
1535 memset(tb, 0, sizeof(tb));
1536 dev = rtnl_create_link(net, name, name_assign_type,
1537 &geneve_link_ops, tb);
1538 if (IS_ERR(dev))
1539 return dev;
1540
1541 err = geneve_configure(net, dev, &geneve_remote_unspec,
1542 0, 0, 0, 0, htons(dst_port), true,
1543 GENEVE_F_UDP_ZERO_CSUM6_RX);
1544 if (err)
1545 goto err;
1546
1547 /* openvswitch users expect packet sizes to be unrestricted,
1548 * so set the largest MTU we can.
1549 */
1550 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1551 if (err)
1552 goto err;
1553
1554 return dev;
1555
1556 err:
1557 free_netdev(dev);
1558 return ERR_PTR(err);
1559}
1560EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1561
1562static __net_init int geneve_init_net(struct net *net)
1563{
1564 struct geneve_net *gn = net_generic(net, geneve_net_id);
1565
1566 INIT_LIST_HEAD(&gn->geneve_list);
1567 INIT_LIST_HEAD(&gn->sock_list);
1568 return 0;
1569}
1570
1571static void __net_exit geneve_exit_net(struct net *net)
1572{
1573 struct geneve_net *gn = net_generic(net, geneve_net_id);
1574 struct geneve_dev *geneve, *next;
1575 struct net_device *dev, *aux;
1576 LIST_HEAD(list);
1577
1578 rtnl_lock();
1579
1580 /* gather any geneve devices that were moved into this ns */
1581 for_each_netdev_safe(net, dev, aux)
1582 if (dev->rtnl_link_ops == &geneve_link_ops)
1583 unregister_netdevice_queue(dev, &list);
1584
1585 /* now gather any other geneve devices that were created in this ns */
1586 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1587 /* If geneve->dev is in the same netns, it was already added
1588 * to the list by the previous loop.
1589 */
1590 if (!net_eq(dev_net(geneve->dev), net))
1591 unregister_netdevice_queue(geneve->dev, &list);
1592 }
1593
1594 /* unregister the devices gathered above */
1595 unregister_netdevice_many(&list);
1596 rtnl_unlock();
1597}
1598
1599static struct pernet_operations geneve_net_ops = {
1600 .init = geneve_init_net,
1601 .exit = geneve_exit_net,
1602 .id = &geneve_net_id,
1603 .size = sizeof(struct geneve_net),
1604};
1605
1606static int __init geneve_init_module(void)
1607{
1608 int rc;
1609
1610 rc = register_pernet_subsys(&geneve_net_ops);
1611 if (rc)
1612 goto out1;
1613
1614 rc = rtnl_link_register(&geneve_link_ops);
1615 if (rc)
1616 goto out2;
1617
1618 return 0;
1619out2:
1620 unregister_pernet_subsys(&geneve_net_ops);
1621out1:
1622 return rc;
1623}
1624late_initcall(geneve_init_module);
1625
1626static void __exit geneve_cleanup_module(void)
1627{
1628 rtnl_link_unregister(&geneve_link_ops);
1629 unregister_pernet_subsys(&geneve_net_ops);
1630}
1631module_exit(geneve_cleanup_module);
1632
1633MODULE_LICENSE("GPL");
1634MODULE_VERSION(GENEVE_NETDEV_VER);
1635MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1636MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1637MODULE_ALIAS_RTNL_LINK("geneve");