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