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