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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-2.6-block.git] / drivers / net / geneve.c
... / ...
CommitLineData
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/netdev_lock.h>
22#include <net/protocol.h>
23
24#define GENEVE_NETDEV_VER "0.6"
25
26#define GENEVE_N_VID (1u << 24)
27#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
28
29#define VNI_HASH_BITS 10
30#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
31
32static bool log_ecn_error = true;
33module_param(log_ecn_error, bool, 0644);
34MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
35
36#define GENEVE_VER 0
37#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
38#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
39#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
40
41/* per-network namespace private data for this module */
42struct geneve_net {
43 struct list_head geneve_list;
44 struct list_head sock_list;
45};
46
47static unsigned int geneve_net_id;
48
49struct geneve_dev_node {
50 struct hlist_node hlist;
51 struct geneve_dev *geneve;
52};
53
54struct geneve_config {
55 struct ip_tunnel_info info;
56 bool collect_md;
57 bool use_udp6_rx_checksums;
58 bool ttl_inherit;
59 enum ifla_geneve_df df;
60 bool inner_proto_inherit;
61 u16 port_min;
62 u16 port_max;
63};
64
65/* Pseudo network device */
66struct geneve_dev {
67 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
68#if IS_ENABLED(CONFIG_IPV6)
69 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
70#endif
71 struct net *net; /* netns for packet i/o */
72 struct net_device *dev; /* netdev for geneve tunnel */
73 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
74#if IS_ENABLED(CONFIG_IPV6)
75 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
76#endif
77 struct list_head next; /* geneve's per namespace list */
78 struct gro_cells gro_cells;
79 struct geneve_config cfg;
80};
81
82struct geneve_sock {
83 bool collect_md;
84 struct list_head list;
85 struct socket *sock;
86 struct rcu_head rcu;
87 int refcnt;
88 struct hlist_head vni_list[VNI_HASH_SIZE];
89};
90
91static inline __u32 geneve_net_vni_hash(u8 vni[3])
92{
93 __u32 vnid;
94
95 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
96 return hash_32(vnid, VNI_HASH_BITS);
97}
98
99static __be64 vni_to_tunnel_id(const __u8 *vni)
100{
101#ifdef __BIG_ENDIAN
102 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
103#else
104 return (__force __be64)(((__force u64)vni[0] << 40) |
105 ((__force u64)vni[1] << 48) |
106 ((__force u64)vni[2] << 56));
107#endif
108}
109
110/* Convert 64 bit tunnel ID to 24 bit VNI. */
111static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
112{
113#ifdef __BIG_ENDIAN
114 vni[0] = (__force __u8)(tun_id >> 16);
115 vni[1] = (__force __u8)(tun_id >> 8);
116 vni[2] = (__force __u8)tun_id;
117#else
118 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
119 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
120 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
121#endif
122}
123
124static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
125{
126 return !memcmp(vni, &tun_id[5], 3);
127}
128
129static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
130{
131 return gs->sock->sk->sk_family;
132}
133
134static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
135 __be32 addr, u8 vni[])
136{
137 struct hlist_head *vni_list_head;
138 struct geneve_dev_node *node;
139 __u32 hash;
140
141 /* Find the device for this VNI */
142 hash = geneve_net_vni_hash(vni);
143 vni_list_head = &gs->vni_list[hash];
144 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
145 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
146 addr == node->geneve->cfg.info.key.u.ipv4.dst)
147 return node->geneve;
148 }
149 return NULL;
150}
151
152#if IS_ENABLED(CONFIG_IPV6)
153static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
154 struct in6_addr addr6, u8 vni[])
155{
156 struct hlist_head *vni_list_head;
157 struct geneve_dev_node *node;
158 __u32 hash;
159
160 /* Find the device for this VNI */
161 hash = geneve_net_vni_hash(vni);
162 vni_list_head = &gs->vni_list[hash];
163 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
164 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
165 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
166 return node->geneve;
167 }
168 return NULL;
169}
170#endif
171
172static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
173{
174 return (struct genevehdr *)(udp_hdr(skb) + 1);
175}
176
177static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
178 struct sk_buff *skb)
179{
180 static u8 zero_vni[3];
181 u8 *vni;
182
183 if (geneve_get_sk_family(gs) == AF_INET) {
184 struct iphdr *iph;
185 __be32 addr;
186
187 iph = ip_hdr(skb); /* outer IP header... */
188
189 if (gs->collect_md) {
190 vni = zero_vni;
191 addr = 0;
192 } else {
193 vni = geneve_hdr(skb)->vni;
194 addr = iph->saddr;
195 }
196
197 return geneve_lookup(gs, addr, vni);
198#if IS_ENABLED(CONFIG_IPV6)
199 } else if (geneve_get_sk_family(gs) == AF_INET6) {
200 static struct in6_addr zero_addr6;
201 struct ipv6hdr *ip6h;
202 struct in6_addr addr6;
203
204 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
205
206 if (gs->collect_md) {
207 vni = zero_vni;
208 addr6 = zero_addr6;
209 } else {
210 vni = geneve_hdr(skb)->vni;
211 addr6 = ip6h->saddr;
212 }
213
214 return geneve6_lookup(gs, addr6, vni);
215#endif
216 }
217 return NULL;
218}
219
220/* geneve receive/decap routine */
221static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
222 struct sk_buff *skb)
223{
224 struct genevehdr *gnvh = geneve_hdr(skb);
225 struct metadata_dst *tun_dst = NULL;
226 unsigned int len;
227 int nh, err = 0;
228 void *oiph;
229
230 if (ip_tunnel_collect_metadata() || gs->collect_md) {
231 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
232
233 __set_bit(IP_TUNNEL_KEY_BIT, flags);
234 __assign_bit(IP_TUNNEL_OAM_BIT, flags, gnvh->oam);
235 __assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical);
236
237 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
238 vni_to_tunnel_id(gnvh->vni),
239 gnvh->opt_len * 4);
240 if (!tun_dst) {
241 dev_dstats_rx_dropped(geneve->dev);
242 goto drop;
243 }
244 /* Update tunnel dst according to Geneve options. */
245 ip_tunnel_flags_zero(flags);
246 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, flags);
247 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
248 gnvh->options, gnvh->opt_len * 4,
249 flags);
250 } else {
251 /* Drop packets w/ critical options,
252 * since we don't support any...
253 */
254 if (gnvh->critical) {
255 DEV_STATS_INC(geneve->dev, rx_frame_errors);
256 DEV_STATS_INC(geneve->dev, rx_errors);
257 goto drop;
258 }
259 }
260
261 if (tun_dst)
262 skb_dst_set(skb, &tun_dst->dst);
263
264 if (gnvh->proto_type == htons(ETH_P_TEB)) {
265 skb_reset_mac_header(skb);
266 skb->protocol = eth_type_trans(skb, geneve->dev);
267 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
268
269 /* Ignore packet loops (and multicast echo) */
270 if (ether_addr_equal(eth_hdr(skb)->h_source,
271 geneve->dev->dev_addr)) {
272 DEV_STATS_INC(geneve->dev, rx_errors);
273 goto drop;
274 }
275 } else {
276 skb_reset_mac_header(skb);
277 skb->dev = geneve->dev;
278 skb->pkt_type = PACKET_HOST;
279 }
280
281 /* Save offset of outer header relative to skb->head,
282 * because we are going to reset the network header to the inner header
283 * and might change skb->head.
284 */
285 nh = skb_network_header(skb) - skb->head;
286
287 skb_reset_network_header(skb);
288
289 if (!pskb_inet_may_pull(skb)) {
290 DEV_STATS_INC(geneve->dev, rx_length_errors);
291 DEV_STATS_INC(geneve->dev, rx_errors);
292 goto drop;
293 }
294
295 /* Get the outer header. */
296 oiph = skb->head + nh;
297
298 if (geneve_get_sk_family(gs) == AF_INET)
299 err = IP_ECN_decapsulate(oiph, skb);
300#if IS_ENABLED(CONFIG_IPV6)
301 else
302 err = IP6_ECN_decapsulate(oiph, skb);
303#endif
304
305 if (unlikely(err)) {
306 if (log_ecn_error) {
307 if (geneve_get_sk_family(gs) == AF_INET)
308 net_info_ratelimited("non-ECT from %pI4 "
309 "with TOS=%#x\n",
310 &((struct iphdr *)oiph)->saddr,
311 ((struct iphdr *)oiph)->tos);
312#if IS_ENABLED(CONFIG_IPV6)
313 else
314 net_info_ratelimited("non-ECT from %pI6\n",
315 &((struct ipv6hdr *)oiph)->saddr);
316#endif
317 }
318 if (err > 1) {
319 DEV_STATS_INC(geneve->dev, rx_frame_errors);
320 DEV_STATS_INC(geneve->dev, rx_errors);
321 goto drop;
322 }
323 }
324
325 len = skb->len;
326 err = gro_cells_receive(&geneve->gro_cells, skb);
327 if (likely(err == NET_RX_SUCCESS))
328 dev_dstats_rx_add(geneve->dev, len);
329
330 return;
331drop:
332 /* Consume bad packet */
333 kfree_skb(skb);
334}
335
336/* Setup stats when device is created */
337static int geneve_init(struct net_device *dev)
338{
339 struct geneve_dev *geneve = netdev_priv(dev);
340 int err;
341
342 err = gro_cells_init(&geneve->gro_cells, dev);
343 if (err)
344 return err;
345
346 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
347 if (err) {
348 gro_cells_destroy(&geneve->gro_cells);
349 return err;
350 }
351 netdev_lockdep_set_classes(dev);
352 return 0;
353}
354
355static void geneve_uninit(struct net_device *dev)
356{
357 struct geneve_dev *geneve = netdev_priv(dev);
358
359 dst_cache_destroy(&geneve->cfg.info.dst_cache);
360 gro_cells_destroy(&geneve->gro_cells);
361}
362
363/* Callback from net/ipv4/udp.c to receive packets */
364static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
365{
366 struct genevehdr *geneveh;
367 struct geneve_dev *geneve;
368 struct geneve_sock *gs;
369 __be16 inner_proto;
370 int opts_len;
371
372 /* Need UDP and Geneve header to be present */
373 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
374 goto drop;
375
376 /* Return packets with reserved bits set */
377 geneveh = geneve_hdr(skb);
378 if (unlikely(geneveh->ver != GENEVE_VER))
379 goto drop;
380
381 gs = rcu_dereference_sk_user_data(sk);
382 if (!gs)
383 goto drop;
384
385 geneve = geneve_lookup_skb(gs, skb);
386 if (!geneve)
387 goto drop;
388
389 inner_proto = geneveh->proto_type;
390
391 if (unlikely((!geneve->cfg.inner_proto_inherit &&
392 inner_proto != htons(ETH_P_TEB)))) {
393 dev_dstats_rx_dropped(geneve->dev);
394 goto drop;
395 }
396
397 opts_len = geneveh->opt_len * 4;
398 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
399 !net_eq(geneve->net, dev_net(geneve->dev)))) {
400 dev_dstats_rx_dropped(geneve->dev);
401 goto drop;
402 }
403
404 geneve_rx(geneve, gs, skb);
405 return 0;
406
407drop:
408 /* Consume bad packet */
409 kfree_skb(skb);
410 return 0;
411}
412
413/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
414static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
415{
416 struct genevehdr *geneveh;
417 struct geneve_sock *gs;
418 u8 zero_vni[3] = { 0 };
419 u8 *vni = zero_vni;
420
421 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
422 return -EINVAL;
423
424 geneveh = geneve_hdr(skb);
425 if (geneveh->ver != GENEVE_VER)
426 return -EINVAL;
427
428 if (geneveh->proto_type != htons(ETH_P_TEB))
429 return -EINVAL;
430
431 gs = rcu_dereference_sk_user_data(sk);
432 if (!gs)
433 return -ENOENT;
434
435 if (geneve_get_sk_family(gs) == AF_INET) {
436 struct iphdr *iph = ip_hdr(skb);
437 __be32 addr4 = 0;
438
439 if (!gs->collect_md) {
440 vni = geneve_hdr(skb)->vni;
441 addr4 = iph->daddr;
442 }
443
444 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
445 }
446
447#if IS_ENABLED(CONFIG_IPV6)
448 if (geneve_get_sk_family(gs) == AF_INET6) {
449 struct ipv6hdr *ip6h = ipv6_hdr(skb);
450 struct in6_addr addr6;
451
452 memset(&addr6, 0, sizeof(struct in6_addr));
453
454 if (!gs->collect_md) {
455 vni = geneve_hdr(skb)->vni;
456 addr6 = ip6h->daddr;
457 }
458
459 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
460 }
461#endif
462
463 return -EPFNOSUPPORT;
464}
465
466static struct socket *geneve_create_sock(struct net *net, bool ipv6,
467 __be16 port, bool ipv6_rx_csum)
468{
469 struct socket *sock;
470 struct udp_port_cfg udp_conf;
471 int err;
472
473 memset(&udp_conf, 0, sizeof(udp_conf));
474
475 if (ipv6) {
476 udp_conf.family = AF_INET6;
477 udp_conf.ipv6_v6only = 1;
478 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
479 } else {
480 udp_conf.family = AF_INET;
481 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
482 }
483
484 udp_conf.local_udp_port = port;
485
486 /* Open UDP socket */
487 err = udp_sock_create(net, &udp_conf, &sock);
488 if (err < 0)
489 return ERR_PTR(err);
490
491 udp_allow_gso(sock->sk);
492 return sock;
493}
494
495static int geneve_hlen(struct genevehdr *gh)
496{
497 return sizeof(*gh) + gh->opt_len * 4;
498}
499
500static struct sk_buff *geneve_gro_receive(struct sock *sk,
501 struct list_head *head,
502 struct sk_buff *skb)
503{
504 struct sk_buff *pp = NULL;
505 struct sk_buff *p;
506 struct genevehdr *gh, *gh2;
507 unsigned int hlen, gh_len, off_gnv;
508 const struct packet_offload *ptype;
509 __be16 type;
510 int flush = 1;
511
512 off_gnv = skb_gro_offset(skb);
513 hlen = off_gnv + sizeof(*gh);
514 gh = skb_gro_header(skb, hlen, off_gnv);
515 if (unlikely(!gh))
516 goto out;
517
518 if (gh->ver != GENEVE_VER || gh->oam)
519 goto out;
520 gh_len = geneve_hlen(gh);
521
522 hlen = off_gnv + gh_len;
523 if (!skb_gro_may_pull(skb, hlen)) {
524 gh = skb_gro_header_slow(skb, hlen, off_gnv);
525 if (unlikely(!gh))
526 goto out;
527 }
528
529 list_for_each_entry(p, head, list) {
530 if (!NAPI_GRO_CB(p)->same_flow)
531 continue;
532
533 gh2 = (struct genevehdr *)(p->data + off_gnv);
534 if (gh->opt_len != gh2->opt_len ||
535 memcmp(gh, gh2, gh_len)) {
536 NAPI_GRO_CB(p)->same_flow = 0;
537 continue;
538 }
539 }
540
541 skb_gro_pull(skb, gh_len);
542 skb_gro_postpull_rcsum(skb, gh, gh_len);
543 type = gh->proto_type;
544 if (likely(type == htons(ETH_P_TEB)))
545 return call_gro_receive(eth_gro_receive, head, skb);
546
547 ptype = gro_find_receive_by_type(type);
548 if (!ptype)
549 goto out;
550
551 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
552 flush = 0;
553
554out:
555 skb_gro_flush_final(skb, pp, flush);
556
557 return pp;
558}
559
560static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
561 int nhoff)
562{
563 struct genevehdr *gh;
564 struct packet_offload *ptype;
565 __be16 type;
566 int gh_len;
567 int err = -ENOSYS;
568
569 gh = (struct genevehdr *)(skb->data + nhoff);
570 gh_len = geneve_hlen(gh);
571 type = gh->proto_type;
572
573 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
574 if (likely(type == htons(ETH_P_TEB)))
575 return eth_gro_complete(skb, nhoff + gh_len);
576
577 ptype = gro_find_complete_by_type(type);
578 if (ptype)
579 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
580
581 skb_set_inner_mac_header(skb, nhoff + gh_len);
582
583 return err;
584}
585
586/* Create new listen socket if needed */
587static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
588 bool ipv6, bool ipv6_rx_csum)
589{
590 struct geneve_net *gn = net_generic(net, geneve_net_id);
591 struct geneve_sock *gs;
592 struct socket *sock;
593 struct udp_tunnel_sock_cfg tunnel_cfg;
594 int h;
595
596 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
597 if (!gs)
598 return ERR_PTR(-ENOMEM);
599
600 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
601 if (IS_ERR(sock)) {
602 kfree(gs);
603 return ERR_CAST(sock);
604 }
605
606 gs->sock = sock;
607 gs->refcnt = 1;
608 for (h = 0; h < VNI_HASH_SIZE; ++h)
609 INIT_HLIST_HEAD(&gs->vni_list[h]);
610
611 /* Initialize the geneve udp offloads structure */
612 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
613
614 /* Mark socket as an encapsulation socket */
615 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
616 tunnel_cfg.sk_user_data = gs;
617 tunnel_cfg.encap_type = 1;
618 tunnel_cfg.gro_receive = geneve_gro_receive;
619 tunnel_cfg.gro_complete = geneve_gro_complete;
620 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
621 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
622 tunnel_cfg.encap_destroy = NULL;
623 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
624 list_add(&gs->list, &gn->sock_list);
625 return gs;
626}
627
628static void __geneve_sock_release(struct geneve_sock *gs)
629{
630 if (!gs || --gs->refcnt)
631 return;
632
633 list_del(&gs->list);
634 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
635 udp_tunnel_sock_release(gs->sock);
636 kfree_rcu(gs, rcu);
637}
638
639static void geneve_sock_release(struct geneve_dev *geneve)
640{
641 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
642#if IS_ENABLED(CONFIG_IPV6)
643 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
644
645 rcu_assign_pointer(geneve->sock6, NULL);
646#endif
647
648 rcu_assign_pointer(geneve->sock4, NULL);
649 synchronize_net();
650
651 __geneve_sock_release(gs4);
652#if IS_ENABLED(CONFIG_IPV6)
653 __geneve_sock_release(gs6);
654#endif
655}
656
657static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
658 sa_family_t family,
659 __be16 dst_port)
660{
661 struct geneve_sock *gs;
662
663 list_for_each_entry(gs, &gn->sock_list, list) {
664 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
665 geneve_get_sk_family(gs) == family) {
666 return gs;
667 }
668 }
669 return NULL;
670}
671
672static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
673{
674 struct net *net = geneve->net;
675 struct geneve_net *gn = net_generic(net, geneve_net_id);
676 struct geneve_dev_node *node;
677 struct geneve_sock *gs;
678 __u8 vni[3];
679 __u32 hash;
680
681 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
682 if (gs) {
683 gs->refcnt++;
684 goto out;
685 }
686
687 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
688 geneve->cfg.use_udp6_rx_checksums);
689 if (IS_ERR(gs))
690 return PTR_ERR(gs);
691
692out:
693 gs->collect_md = geneve->cfg.collect_md;
694#if IS_ENABLED(CONFIG_IPV6)
695 if (ipv6) {
696 rcu_assign_pointer(geneve->sock6, gs);
697 node = &geneve->hlist6;
698 } else
699#endif
700 {
701 rcu_assign_pointer(geneve->sock4, gs);
702 node = &geneve->hlist4;
703 }
704 node->geneve = geneve;
705
706 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
707 hash = geneve_net_vni_hash(vni);
708 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
709 return 0;
710}
711
712static int geneve_open(struct net_device *dev)
713{
714 struct geneve_dev *geneve = netdev_priv(dev);
715 bool metadata = geneve->cfg.collect_md;
716 bool ipv4, ipv6;
717 int ret = 0;
718
719 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
720 ipv4 = !ipv6 || metadata;
721#if IS_ENABLED(CONFIG_IPV6)
722 if (ipv6) {
723 ret = geneve_sock_add(geneve, true);
724 if (ret < 0 && ret != -EAFNOSUPPORT)
725 ipv4 = false;
726 }
727#endif
728 if (ipv4)
729 ret = geneve_sock_add(geneve, false);
730 if (ret < 0)
731 geneve_sock_release(geneve);
732
733 return ret;
734}
735
736static int geneve_stop(struct net_device *dev)
737{
738 struct geneve_dev *geneve = netdev_priv(dev);
739
740 hlist_del_init_rcu(&geneve->hlist4.hlist);
741#if IS_ENABLED(CONFIG_IPV6)
742 hlist_del_init_rcu(&geneve->hlist6.hlist);
743#endif
744 geneve_sock_release(geneve);
745 return 0;
746}
747
748static void geneve_build_header(struct genevehdr *geneveh,
749 const struct ip_tunnel_info *info,
750 __be16 inner_proto)
751{
752 geneveh->ver = GENEVE_VER;
753 geneveh->opt_len = info->options_len / 4;
754 geneveh->oam = test_bit(IP_TUNNEL_OAM_BIT, info->key.tun_flags);
755 geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT,
756 info->key.tun_flags);
757 geneveh->rsvd1 = 0;
758 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
759 geneveh->proto_type = inner_proto;
760 geneveh->rsvd2 = 0;
761
762 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags))
763 ip_tunnel_info_opts_get(geneveh->options, info);
764}
765
766static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
767 const struct ip_tunnel_info *info,
768 bool xnet, int ip_hdr_len,
769 bool inner_proto_inherit)
770{
771 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
772 struct genevehdr *gnvh;
773 __be16 inner_proto;
774 int min_headroom;
775 int err;
776
777 skb_reset_mac_header(skb);
778 skb_scrub_packet(skb, xnet);
779
780 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
781 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
782 err = skb_cow_head(skb, min_headroom);
783 if (unlikely(err))
784 goto free_dst;
785
786 err = udp_tunnel_handle_offloads(skb, udp_sum);
787 if (err)
788 goto free_dst;
789
790 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
791 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
792 geneve_build_header(gnvh, info, inner_proto);
793 skb_set_inner_protocol(skb, inner_proto);
794 return 0;
795
796free_dst:
797 dst_release(dst);
798 return err;
799}
800
801static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
802 const struct ip_tunnel_info *info,
803 bool *use_cache)
804{
805 struct geneve_dev *geneve = netdev_priv(dev);
806 u8 dsfield;
807
808 dsfield = info->key.tos;
809 if (dsfield == 1 && !geneve->cfg.collect_md) {
810 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
811 *use_cache = false;
812 }
813
814 return dsfield;
815}
816
817static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
818 struct geneve_dev *geneve,
819 const struct ip_tunnel_info *info)
820{
821 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit;
822 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
823 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
824 const struct ip_tunnel_key *key = &info->key;
825 struct rtable *rt;
826 bool use_cache;
827 __u8 tos, ttl;
828 __be16 df = 0;
829 __be32 saddr;
830 __be16 sport;
831 int err;
832
833 if (skb_vlan_inet_prepare(skb, inner_proto_inherit))
834 return -EINVAL;
835
836 if (!gs4)
837 return -EIO;
838
839 use_cache = ip_tunnel_dst_cache_usable(skb, info);
840 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
841 sport = udp_flow_src_port(geneve->net, skb,
842 geneve->cfg.port_min,
843 geneve->cfg.port_max, true);
844
845 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
846 &info->key,
847 sport, geneve->cfg.info.key.tp_dst, tos,
848 use_cache ?
849 (struct dst_cache *)&info->dst_cache : NULL);
850 if (IS_ERR(rt))
851 return PTR_ERR(rt);
852
853 err = skb_tunnel_check_pmtu(skb, &rt->dst,
854 GENEVE_IPV4_HLEN + info->options_len,
855 netif_is_any_bridge_port(dev));
856 if (err < 0) {
857 dst_release(&rt->dst);
858 return err;
859 } else if (err) {
860 struct ip_tunnel_info *info;
861
862 info = skb_tunnel_info(skb);
863 if (info) {
864 struct ip_tunnel_info *unclone;
865
866 unclone = skb_tunnel_info_unclone(skb);
867 if (unlikely(!unclone)) {
868 dst_release(&rt->dst);
869 return -ENOMEM;
870 }
871
872 unclone->key.u.ipv4.dst = saddr;
873 unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
874 }
875
876 if (!pskb_may_pull(skb, ETH_HLEN)) {
877 dst_release(&rt->dst);
878 return -EINVAL;
879 }
880
881 skb->protocol = eth_type_trans(skb, geneve->dev);
882 __netif_rx(skb);
883 dst_release(&rt->dst);
884 return -EMSGSIZE;
885 }
886
887 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
888 if (geneve->cfg.collect_md) {
889 ttl = key->ttl;
890
891 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ?
892 htons(IP_DF) : 0;
893 } else {
894 if (geneve->cfg.ttl_inherit)
895 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
896 else
897 ttl = key->ttl;
898 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
899
900 if (geneve->cfg.df == GENEVE_DF_SET) {
901 df = htons(IP_DF);
902 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
903 struct ethhdr *eth = skb_eth_hdr(skb);
904
905 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
906 df = htons(IP_DF);
907 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
908 struct iphdr *iph = ip_hdr(skb);
909
910 if (iph->frag_off & htons(IP_DF))
911 df = htons(IP_DF);
912 }
913 }
914 }
915
916 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
917 inner_proto_inherit);
918 if (unlikely(err))
919 return err;
920
921 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
922 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
923 !net_eq(geneve->net, dev_net(geneve->dev)),
924 !test_bit(IP_TUNNEL_CSUM_BIT,
925 info->key.tun_flags));
926 return 0;
927}
928
929#if IS_ENABLED(CONFIG_IPV6)
930static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
931 struct geneve_dev *geneve,
932 const struct ip_tunnel_info *info)
933{
934 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit;
935 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
936 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
937 const struct ip_tunnel_key *key = &info->key;
938 struct dst_entry *dst = NULL;
939 struct in6_addr saddr;
940 bool use_cache;
941 __u8 prio, ttl;
942 __be16 sport;
943 int err;
944
945 if (skb_vlan_inet_prepare(skb, inner_proto_inherit))
946 return -EINVAL;
947
948 if (!gs6)
949 return -EIO;
950
951 use_cache = ip_tunnel_dst_cache_usable(skb, info);
952 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
953 sport = udp_flow_src_port(geneve->net, skb,
954 geneve->cfg.port_min,
955 geneve->cfg.port_max, true);
956
957 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
958 &saddr, key, sport,
959 geneve->cfg.info.key.tp_dst, prio,
960 use_cache ?
961 (struct dst_cache *)&info->dst_cache : NULL);
962 if (IS_ERR(dst))
963 return PTR_ERR(dst);
964
965 err = skb_tunnel_check_pmtu(skb, dst,
966 GENEVE_IPV6_HLEN + info->options_len,
967 netif_is_any_bridge_port(dev));
968 if (err < 0) {
969 dst_release(dst);
970 return err;
971 } else if (err) {
972 struct ip_tunnel_info *info = skb_tunnel_info(skb);
973
974 if (info) {
975 struct ip_tunnel_info *unclone;
976
977 unclone = skb_tunnel_info_unclone(skb);
978 if (unlikely(!unclone)) {
979 dst_release(dst);
980 return -ENOMEM;
981 }
982
983 unclone->key.u.ipv6.dst = saddr;
984 unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
985 }
986
987 if (!pskb_may_pull(skb, ETH_HLEN)) {
988 dst_release(dst);
989 return -EINVAL;
990 }
991
992 skb->protocol = eth_type_trans(skb, geneve->dev);
993 __netif_rx(skb);
994 dst_release(dst);
995 return -EMSGSIZE;
996 }
997
998 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
999 if (geneve->cfg.collect_md) {
1000 ttl = key->ttl;
1001 } else {
1002 if (geneve->cfg.ttl_inherit)
1003 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1004 else
1005 ttl = key->ttl;
1006 ttl = ttl ? : ip6_dst_hoplimit(dst);
1007 }
1008 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1009 inner_proto_inherit);
1010 if (unlikely(err))
1011 return err;
1012
1013 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1014 &saddr, &key->u.ipv6.dst, prio, ttl,
1015 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1016 !test_bit(IP_TUNNEL_CSUM_BIT,
1017 info->key.tun_flags));
1018 return 0;
1019}
1020#endif
1021
1022static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1023{
1024 struct geneve_dev *geneve = netdev_priv(dev);
1025 struct ip_tunnel_info *info = NULL;
1026 int err;
1027
1028 if (geneve->cfg.collect_md) {
1029 info = skb_tunnel_info(skb);
1030 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1031 netdev_dbg(dev, "no tunnel metadata\n");
1032 dev_kfree_skb(skb);
1033 dev_dstats_tx_dropped(dev);
1034 return NETDEV_TX_OK;
1035 }
1036 } else {
1037 info = &geneve->cfg.info;
1038 }
1039
1040 rcu_read_lock();
1041#if IS_ENABLED(CONFIG_IPV6)
1042 if (info->mode & IP_TUNNEL_INFO_IPV6)
1043 err = geneve6_xmit_skb(skb, dev, geneve, info);
1044 else
1045#endif
1046 err = geneve_xmit_skb(skb, dev, geneve, info);
1047 rcu_read_unlock();
1048
1049 if (likely(!err))
1050 return NETDEV_TX_OK;
1051
1052 if (err != -EMSGSIZE)
1053 dev_kfree_skb(skb);
1054
1055 if (err == -ELOOP)
1056 DEV_STATS_INC(dev, collisions);
1057 else if (err == -ENETUNREACH)
1058 DEV_STATS_INC(dev, tx_carrier_errors);
1059
1060 DEV_STATS_INC(dev, tx_errors);
1061 return NETDEV_TX_OK;
1062}
1063
1064static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1065{
1066 if (new_mtu > dev->max_mtu)
1067 new_mtu = dev->max_mtu;
1068 else if (new_mtu < dev->min_mtu)
1069 new_mtu = dev->min_mtu;
1070
1071 WRITE_ONCE(dev->mtu, new_mtu);
1072 return 0;
1073}
1074
1075static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1076{
1077 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1078 struct geneve_dev *geneve = netdev_priv(dev);
1079 __be16 sport;
1080
1081 if (ip_tunnel_info_af(info) == AF_INET) {
1082 struct rtable *rt;
1083 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1084 bool use_cache;
1085 __be32 saddr;
1086 u8 tos;
1087
1088 if (!gs4)
1089 return -EIO;
1090
1091 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1092 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1093 sport = udp_flow_src_port(geneve->net, skb,
1094 geneve->cfg.port_min,
1095 geneve->cfg.port_max, true);
1096
1097 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1098 &info->key,
1099 sport, geneve->cfg.info.key.tp_dst,
1100 tos,
1101 use_cache ? &info->dst_cache : NULL);
1102 if (IS_ERR(rt))
1103 return PTR_ERR(rt);
1104
1105 ip_rt_put(rt);
1106 info->key.u.ipv4.src = saddr;
1107#if IS_ENABLED(CONFIG_IPV6)
1108 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1109 struct dst_entry *dst;
1110 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1111 struct in6_addr saddr;
1112 bool use_cache;
1113 u8 prio;
1114
1115 if (!gs6)
1116 return -EIO;
1117
1118 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1119 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1120 sport = udp_flow_src_port(geneve->net, skb,
1121 geneve->cfg.port_min,
1122 geneve->cfg.port_max, true);
1123
1124 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1125 &saddr, &info->key, sport,
1126 geneve->cfg.info.key.tp_dst, prio,
1127 use_cache ? &info->dst_cache : NULL);
1128 if (IS_ERR(dst))
1129 return PTR_ERR(dst);
1130
1131 dst_release(dst);
1132 info->key.u.ipv6.src = saddr;
1133#endif
1134 } else {
1135 return -EINVAL;
1136 }
1137
1138 info->key.tp_src = sport;
1139 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1140 return 0;
1141}
1142
1143static const struct net_device_ops geneve_netdev_ops = {
1144 .ndo_init = geneve_init,
1145 .ndo_uninit = geneve_uninit,
1146 .ndo_open = geneve_open,
1147 .ndo_stop = geneve_stop,
1148 .ndo_start_xmit = geneve_xmit,
1149 .ndo_change_mtu = geneve_change_mtu,
1150 .ndo_validate_addr = eth_validate_addr,
1151 .ndo_set_mac_address = eth_mac_addr,
1152 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1153};
1154
1155static void geneve_get_drvinfo(struct net_device *dev,
1156 struct ethtool_drvinfo *drvinfo)
1157{
1158 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1159 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1160}
1161
1162static const struct ethtool_ops geneve_ethtool_ops = {
1163 .get_drvinfo = geneve_get_drvinfo,
1164 .get_link = ethtool_op_get_link,
1165};
1166
1167/* Info for udev, that this is a virtual tunnel endpoint */
1168static const struct device_type geneve_type = {
1169 .name = "geneve",
1170};
1171
1172/* Calls the ndo_udp_tunnel_add of the caller in order to
1173 * supply the listening GENEVE udp ports. Callers are expected
1174 * to implement the ndo_udp_tunnel_add.
1175 */
1176static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1177{
1178 struct net *net = dev_net(dev);
1179 struct geneve_net *gn = net_generic(net, geneve_net_id);
1180 struct geneve_sock *gs;
1181
1182 rcu_read_lock();
1183 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1184 if (push) {
1185 udp_tunnel_push_rx_port(dev, gs->sock,
1186 UDP_TUNNEL_TYPE_GENEVE);
1187 } else {
1188 udp_tunnel_drop_rx_port(dev, gs->sock,
1189 UDP_TUNNEL_TYPE_GENEVE);
1190 }
1191 }
1192 rcu_read_unlock();
1193}
1194
1195/* Initialize the device structure. */
1196static void geneve_setup(struct net_device *dev)
1197{
1198 ether_setup(dev);
1199
1200 dev->netdev_ops = &geneve_netdev_ops;
1201 dev->ethtool_ops = &geneve_ethtool_ops;
1202 dev->needs_free_netdev = true;
1203
1204 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1205
1206 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1207 dev->features |= NETIF_F_RXCSUM;
1208 dev->features |= NETIF_F_GSO_SOFTWARE;
1209
1210 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1211 dev->hw_features |= NETIF_F_RXCSUM;
1212 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1213
1214 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;
1215 /* MTU range: 68 - (something less than 65535) */
1216 dev->min_mtu = ETH_MIN_MTU;
1217 /* The max_mtu calculation does not take account of GENEVE
1218 * options, to avoid excluding potentially valid
1219 * configurations. This will be further reduced by IPvX hdr size.
1220 */
1221 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1222
1223 netif_keep_dst(dev);
1224 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1225 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1226 dev->lltx = true;
1227 eth_hw_addr_random(dev);
1228}
1229
1230static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1231 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1232 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1233 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1234 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1235 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1236 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1237 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1238 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1239 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1240 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1241 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1242 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1243 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1244 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1245 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG },
1246 [IFLA_GENEVE_PORT_RANGE] = NLA_POLICY_EXACT_LEN(sizeof(struct ifla_geneve_port_range)),
1247};
1248
1249static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1250 struct netlink_ext_ack *extack)
1251{
1252 if (tb[IFLA_ADDRESS]) {
1253 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1254 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1255 "Provided link layer address is not Ethernet");
1256 return -EINVAL;
1257 }
1258
1259 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1260 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1261 "Provided Ethernet address is not unicast");
1262 return -EADDRNOTAVAIL;
1263 }
1264 }
1265
1266 if (!data) {
1267 NL_SET_ERR_MSG(extack,
1268 "Not enough attributes provided to perform the operation");
1269 return -EINVAL;
1270 }
1271
1272 if (data[IFLA_GENEVE_ID]) {
1273 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1274
1275 if (vni >= GENEVE_N_VID) {
1276 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1277 "Geneve ID must be lower than 16777216");
1278 return -ERANGE;
1279 }
1280 }
1281
1282 if (data[IFLA_GENEVE_DF]) {
1283 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1284
1285 if (df < 0 || df > GENEVE_DF_MAX) {
1286 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1287 "Invalid DF attribute");
1288 return -EINVAL;
1289 }
1290 }
1291
1292 if (data[IFLA_GENEVE_PORT_RANGE]) {
1293 const struct ifla_geneve_port_range *p;
1294
1295 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]);
1296 if (ntohs(p->high) < ntohs(p->low)) {
1297 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_PORT_RANGE],
1298 "Invalid source port range");
1299 return -EINVAL;
1300 }
1301 }
1302
1303 return 0;
1304}
1305
1306static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1307 const struct ip_tunnel_info *info,
1308 bool *tun_on_same_port,
1309 bool *tun_collect_md)
1310{
1311 struct geneve_dev *geneve, *t = NULL;
1312
1313 *tun_on_same_port = false;
1314 *tun_collect_md = false;
1315 list_for_each_entry(geneve, &gn->geneve_list, next) {
1316 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1317 *tun_collect_md = geneve->cfg.collect_md;
1318 *tun_on_same_port = true;
1319 }
1320 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1321 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1322 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1323 t = geneve;
1324 }
1325 return t;
1326}
1327
1328static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1329{
1330 return !(info->key.tun_id || info->key.tos ||
1331 !ip_tunnel_flags_empty(info->key.tun_flags) ||
1332 info->key.ttl || info->key.label || info->key.tp_src ||
1333 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1334}
1335
1336static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1337 struct ip_tunnel_info *b)
1338{
1339 if (ip_tunnel_info_af(a) == AF_INET)
1340 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1341 else
1342 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1343}
1344
1345static int geneve_configure(struct net *net, struct net_device *dev,
1346 struct netlink_ext_ack *extack,
1347 const struct geneve_config *cfg)
1348{
1349 struct geneve_net *gn = net_generic(net, geneve_net_id);
1350 struct geneve_dev *t, *geneve = netdev_priv(dev);
1351 const struct ip_tunnel_info *info = &cfg->info;
1352 bool tun_collect_md, tun_on_same_port;
1353 int err, encap_len;
1354
1355 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1356 NL_SET_ERR_MSG(extack,
1357 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1358 return -EINVAL;
1359 }
1360
1361 geneve->net = net;
1362 geneve->dev = dev;
1363
1364 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1365 if (t)
1366 return -EBUSY;
1367
1368 /* make enough headroom for basic scenario */
1369 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1370 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1371 encap_len += sizeof(struct iphdr);
1372 dev->max_mtu -= sizeof(struct iphdr);
1373 } else {
1374 encap_len += sizeof(struct ipv6hdr);
1375 dev->max_mtu -= sizeof(struct ipv6hdr);
1376 }
1377 dev->needed_headroom = encap_len + ETH_HLEN;
1378
1379 if (cfg->collect_md) {
1380 if (tun_on_same_port) {
1381 NL_SET_ERR_MSG(extack,
1382 "There can be only one externally controlled device on a destination port");
1383 return -EPERM;
1384 }
1385 } else {
1386 if (tun_collect_md) {
1387 NL_SET_ERR_MSG(extack,
1388 "There already exists an externally controlled device on this destination port");
1389 return -EPERM;
1390 }
1391 }
1392
1393 dst_cache_reset(&geneve->cfg.info.dst_cache);
1394 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1395
1396 if (geneve->cfg.inner_proto_inherit) {
1397 dev->header_ops = NULL;
1398 dev->type = ARPHRD_NONE;
1399 dev->hard_header_len = 0;
1400 dev->addr_len = 0;
1401 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1402 }
1403
1404 err = register_netdevice(dev);
1405 if (err)
1406 return err;
1407
1408 list_add(&geneve->next, &gn->geneve_list);
1409 return 0;
1410}
1411
1412static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1413{
1414 memset(info, 0, sizeof(*info));
1415 info->key.tp_dst = htons(dst_port);
1416}
1417
1418static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1419 struct netlink_ext_ack *extack,
1420 struct geneve_config *cfg, bool changelink)
1421{
1422 struct ip_tunnel_info *info = &cfg->info;
1423 int attrtype;
1424
1425 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1426 NL_SET_ERR_MSG(extack,
1427 "Cannot specify both IPv4 and IPv6 Remote addresses");
1428 return -EINVAL;
1429 }
1430
1431 if (data[IFLA_GENEVE_REMOTE]) {
1432 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1433 attrtype = IFLA_GENEVE_REMOTE;
1434 goto change_notsup;
1435 }
1436
1437 info->key.u.ipv4.dst =
1438 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1439
1440 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1441 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1442 "Remote IPv4 address cannot be Multicast");
1443 return -EINVAL;
1444 }
1445 }
1446
1447 if (data[IFLA_GENEVE_REMOTE6]) {
1448#if IS_ENABLED(CONFIG_IPV6)
1449 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1450 attrtype = IFLA_GENEVE_REMOTE6;
1451 goto change_notsup;
1452 }
1453
1454 info->mode = IP_TUNNEL_INFO_IPV6;
1455 info->key.u.ipv6.dst =
1456 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1457
1458 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1459 IPV6_ADDR_LINKLOCAL) {
1460 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1461 "Remote IPv6 address cannot be link-local");
1462 return -EINVAL;
1463 }
1464 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1465 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1466 "Remote IPv6 address cannot be Multicast");
1467 return -EINVAL;
1468 }
1469 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1470 cfg->use_udp6_rx_checksums = true;
1471#else
1472 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1473 "IPv6 support not enabled in the kernel");
1474 return -EPFNOSUPPORT;
1475#endif
1476 }
1477
1478 if (data[IFLA_GENEVE_ID]) {
1479 __u32 vni;
1480 __u8 tvni[3];
1481 __be64 tunid;
1482
1483 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1484 tvni[0] = (vni & 0x00ff0000) >> 16;
1485 tvni[1] = (vni & 0x0000ff00) >> 8;
1486 tvni[2] = vni & 0x000000ff;
1487
1488 tunid = vni_to_tunnel_id(tvni);
1489 if (changelink && (tunid != info->key.tun_id)) {
1490 attrtype = IFLA_GENEVE_ID;
1491 goto change_notsup;
1492 }
1493 info->key.tun_id = tunid;
1494 }
1495
1496 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1497 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1498 cfg->ttl_inherit = true;
1499 else
1500 cfg->ttl_inherit = false;
1501 } else if (data[IFLA_GENEVE_TTL]) {
1502 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1503 cfg->ttl_inherit = false;
1504 }
1505
1506 if (data[IFLA_GENEVE_TOS])
1507 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1508
1509 if (data[IFLA_GENEVE_DF])
1510 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1511
1512 if (data[IFLA_GENEVE_LABEL]) {
1513 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1514 IPV6_FLOWLABEL_MASK;
1515 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1516 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1517 "Label attribute only applies for IPv6 Geneve devices");
1518 return -EINVAL;
1519 }
1520 }
1521
1522 if (data[IFLA_GENEVE_PORT]) {
1523 if (changelink) {
1524 attrtype = IFLA_GENEVE_PORT;
1525 goto change_notsup;
1526 }
1527 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1528 }
1529
1530 if (data[IFLA_GENEVE_PORT_RANGE]) {
1531 const struct ifla_geneve_port_range *p;
1532
1533 if (changelink) {
1534 attrtype = IFLA_GENEVE_PORT_RANGE;
1535 goto change_notsup;
1536 }
1537 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]);
1538 cfg->port_min = ntohs(p->low);
1539 cfg->port_max = ntohs(p->high);
1540 }
1541
1542 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1543 if (changelink) {
1544 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1545 goto change_notsup;
1546 }
1547 cfg->collect_md = true;
1548 }
1549
1550 if (data[IFLA_GENEVE_UDP_CSUM]) {
1551 if (changelink) {
1552 attrtype = IFLA_GENEVE_UDP_CSUM;
1553 goto change_notsup;
1554 }
1555 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1556 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1557 }
1558
1559 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1560#if IS_ENABLED(CONFIG_IPV6)
1561 if (changelink) {
1562 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1563 goto change_notsup;
1564 }
1565 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1566 __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1567#else
1568 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1569 "IPv6 support not enabled in the kernel");
1570 return -EPFNOSUPPORT;
1571#endif
1572 }
1573
1574 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1575#if IS_ENABLED(CONFIG_IPV6)
1576 if (changelink) {
1577 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1578 goto change_notsup;
1579 }
1580 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1581 cfg->use_udp6_rx_checksums = false;
1582#else
1583 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1584 "IPv6 support not enabled in the kernel");
1585 return -EPFNOSUPPORT;
1586#endif
1587 }
1588
1589 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1590 if (changelink) {
1591 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1592 goto change_notsup;
1593 }
1594 cfg->inner_proto_inherit = true;
1595 }
1596
1597 return 0;
1598change_notsup:
1599 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1600 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1601 return -EOPNOTSUPP;
1602}
1603
1604static void geneve_link_config(struct net_device *dev,
1605 struct ip_tunnel_info *info, struct nlattr *tb[])
1606{
1607 struct geneve_dev *geneve = netdev_priv(dev);
1608 int ldev_mtu = 0;
1609
1610 if (tb[IFLA_MTU]) {
1611 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1612 return;
1613 }
1614
1615 switch (ip_tunnel_info_af(info)) {
1616 case AF_INET: {
1617 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1618 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1619
1620 if (!IS_ERR(rt) && rt->dst.dev) {
1621 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1622 ip_rt_put(rt);
1623 }
1624 break;
1625 }
1626#if IS_ENABLED(CONFIG_IPV6)
1627 case AF_INET6: {
1628 struct rt6_info *rt;
1629
1630 if (!__in6_dev_get(dev))
1631 break;
1632
1633 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1634 NULL, 0);
1635
1636 if (rt && rt->dst.dev)
1637 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1638 ip6_rt_put(rt);
1639 break;
1640 }
1641#endif
1642 }
1643
1644 if (ldev_mtu <= 0)
1645 return;
1646
1647 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1648}
1649
1650static int geneve_newlink(struct net_device *dev,
1651 struct rtnl_newlink_params *params,
1652 struct netlink_ext_ack *extack)
1653{
1654 struct net *link_net = rtnl_newlink_link_net(params);
1655 struct nlattr **data = params->data;
1656 struct nlattr **tb = params->tb;
1657 struct geneve_config cfg = {
1658 .df = GENEVE_DF_UNSET,
1659 .use_udp6_rx_checksums = false,
1660 .ttl_inherit = false,
1661 .collect_md = false,
1662 .port_min = 1,
1663 .port_max = USHRT_MAX,
1664 };
1665 int err;
1666
1667 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1668 err = geneve_nl2info(tb, data, extack, &cfg, false);
1669 if (err)
1670 return err;
1671
1672 err = geneve_configure(link_net, dev, extack, &cfg);
1673 if (err)
1674 return err;
1675
1676 geneve_link_config(dev, &cfg.info, tb);
1677
1678 return 0;
1679}
1680
1681/* Quiesces the geneve device data path for both TX and RX.
1682 *
1683 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1684 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1685 * to complete for the existing set of in-flight packets to be transmitted,
1686 * then we would have quiesced the transmit data path. All the future packets
1687 * will get dropped until we unquiesce the data path.
1688 *
1689 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1690 * if we set that to NULL under RCU and wait for synchronize_net() to
1691 * complete, then we would have quiesced the receive data path.
1692 */
1693static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1694 struct geneve_sock **gs6)
1695{
1696 *gs4 = rtnl_dereference(geneve->sock4);
1697 rcu_assign_pointer(geneve->sock4, NULL);
1698 if (*gs4)
1699 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1700#if IS_ENABLED(CONFIG_IPV6)
1701 *gs6 = rtnl_dereference(geneve->sock6);
1702 rcu_assign_pointer(geneve->sock6, NULL);
1703 if (*gs6)
1704 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1705#else
1706 *gs6 = NULL;
1707#endif
1708 synchronize_net();
1709}
1710
1711/* Resumes the geneve device data path for both TX and RX. */
1712static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1713 struct geneve_sock __maybe_unused *gs6)
1714{
1715 rcu_assign_pointer(geneve->sock4, gs4);
1716 if (gs4)
1717 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1718#if IS_ENABLED(CONFIG_IPV6)
1719 rcu_assign_pointer(geneve->sock6, gs6);
1720 if (gs6)
1721 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1722#endif
1723 synchronize_net();
1724}
1725
1726static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1727 struct nlattr *data[],
1728 struct netlink_ext_ack *extack)
1729{
1730 struct geneve_dev *geneve = netdev_priv(dev);
1731 struct geneve_sock *gs4, *gs6;
1732 struct geneve_config cfg;
1733 int err;
1734
1735 /* If the geneve device is configured for metadata (or externally
1736 * controlled, for example, OVS), then nothing can be changed.
1737 */
1738 if (geneve->cfg.collect_md)
1739 return -EOPNOTSUPP;
1740
1741 /* Start with the existing info. */
1742 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1743 err = geneve_nl2info(tb, data, extack, &cfg, true);
1744 if (err)
1745 return err;
1746
1747 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1748 dst_cache_reset(&cfg.info.dst_cache);
1749 geneve_link_config(dev, &cfg.info, tb);
1750 }
1751
1752 geneve_quiesce(geneve, &gs4, &gs6);
1753 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1754 geneve_unquiesce(geneve, gs4, gs6);
1755
1756 return 0;
1757}
1758
1759static void geneve_dellink(struct net_device *dev, struct list_head *head)
1760{
1761 struct geneve_dev *geneve = netdev_priv(dev);
1762
1763 list_del(&geneve->next);
1764 unregister_netdevice_queue(dev, head);
1765}
1766
1767static size_t geneve_get_size(const struct net_device *dev)
1768{
1769 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1770 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1771 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1772 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1773 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1774 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1775 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1776 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1777 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1778 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1779 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1780 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1781 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1782 nla_total_size(sizeof(struct ifla_geneve_port_range)) + /* IFLA_GENEVE_PORT_RANGE */
1783 0;
1784}
1785
1786static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1787{
1788 struct geneve_dev *geneve = netdev_priv(dev);
1789 struct ip_tunnel_info *info = &geneve->cfg.info;
1790 bool ttl_inherit = geneve->cfg.ttl_inherit;
1791 bool metadata = geneve->cfg.collect_md;
1792 struct ifla_geneve_port_range ports = {
1793 .low = htons(geneve->cfg.port_min),
1794 .high = htons(geneve->cfg.port_max),
1795 };
1796 __u8 tmp_vni[3];
1797 __u32 vni;
1798
1799 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1800 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1801 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1802 goto nla_put_failure;
1803
1804 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1805 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1806 info->key.u.ipv4.dst))
1807 goto nla_put_failure;
1808 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1809 test_bit(IP_TUNNEL_CSUM_BIT,
1810 info->key.tun_flags)))
1811 goto nla_put_failure;
1812
1813#if IS_ENABLED(CONFIG_IPV6)
1814 } else if (!metadata) {
1815 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1816 &info->key.u.ipv6.dst))
1817 goto nla_put_failure;
1818 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1819 !test_bit(IP_TUNNEL_CSUM_BIT,
1820 info->key.tun_flags)))
1821 goto nla_put_failure;
1822#endif
1823 }
1824
1825 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1826 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1827 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1828 goto nla_put_failure;
1829
1830 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1831 goto nla_put_failure;
1832
1833 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1834 goto nla_put_failure;
1835
1836 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1837 goto nla_put_failure;
1838
1839#if IS_ENABLED(CONFIG_IPV6)
1840 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1841 !geneve->cfg.use_udp6_rx_checksums))
1842 goto nla_put_failure;
1843#endif
1844
1845 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1846 goto nla_put_failure;
1847
1848 if (geneve->cfg.inner_proto_inherit &&
1849 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1850 goto nla_put_failure;
1851
1852 if (nla_put(skb, IFLA_GENEVE_PORT_RANGE, sizeof(ports), &ports))
1853 goto nla_put_failure;
1854
1855 return 0;
1856
1857nla_put_failure:
1858 return -EMSGSIZE;
1859}
1860
1861static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1862 .kind = "geneve",
1863 .maxtype = IFLA_GENEVE_MAX,
1864 .policy = geneve_policy,
1865 .priv_size = sizeof(struct geneve_dev),
1866 .setup = geneve_setup,
1867 .validate = geneve_validate,
1868 .newlink = geneve_newlink,
1869 .changelink = geneve_changelink,
1870 .dellink = geneve_dellink,
1871 .get_size = geneve_get_size,
1872 .fill_info = geneve_fill_info,
1873};
1874
1875struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1876 u8 name_assign_type, u16 dst_port)
1877{
1878 struct nlattr *tb[IFLA_MAX + 1];
1879 struct net_device *dev;
1880 LIST_HEAD(list_kill);
1881 int err;
1882 struct geneve_config cfg = {
1883 .df = GENEVE_DF_UNSET,
1884 .use_udp6_rx_checksums = true,
1885 .ttl_inherit = false,
1886 .collect_md = true,
1887 .port_min = 1,
1888 .port_max = USHRT_MAX,
1889 };
1890
1891 memset(tb, 0, sizeof(tb));
1892 dev = rtnl_create_link(net, name, name_assign_type,
1893 &geneve_link_ops, tb, NULL);
1894 if (IS_ERR(dev))
1895 return dev;
1896
1897 init_tnl_info(&cfg.info, dst_port);
1898 err = geneve_configure(net, dev, NULL, &cfg);
1899 if (err) {
1900 free_netdev(dev);
1901 return ERR_PTR(err);
1902 }
1903
1904 /* openvswitch users expect packet sizes to be unrestricted,
1905 * so set the largest MTU we can.
1906 */
1907 err = geneve_change_mtu(dev, IP_MAX_MTU);
1908 if (err)
1909 goto err;
1910
1911 err = rtnl_configure_link(dev, NULL, 0, NULL);
1912 if (err < 0)
1913 goto err;
1914
1915 return dev;
1916err:
1917 geneve_dellink(dev, &list_kill);
1918 unregister_netdevice_many(&list_kill);
1919 return ERR_PTR(err);
1920}
1921EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1922
1923static int geneve_netdevice_event(struct notifier_block *unused,
1924 unsigned long event, void *ptr)
1925{
1926 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1927
1928 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1929 geneve_offload_rx_ports(dev, true);
1930 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1931 geneve_offload_rx_ports(dev, false);
1932
1933 return NOTIFY_DONE;
1934}
1935
1936static struct notifier_block geneve_notifier_block __read_mostly = {
1937 .notifier_call = geneve_netdevice_event,
1938};
1939
1940static __net_init int geneve_init_net(struct net *net)
1941{
1942 struct geneve_net *gn = net_generic(net, geneve_net_id);
1943
1944 INIT_LIST_HEAD(&gn->geneve_list);
1945 INIT_LIST_HEAD(&gn->sock_list);
1946 return 0;
1947}
1948
1949static void __net_exit geneve_exit_rtnl_net(struct net *net,
1950 struct list_head *dev_to_kill)
1951{
1952 struct geneve_net *gn = net_generic(net, geneve_net_id);
1953 struct geneve_dev *geneve, *next;
1954
1955 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next)
1956 geneve_dellink(geneve->dev, dev_to_kill);
1957}
1958
1959static void __net_exit geneve_exit_net(struct net *net)
1960{
1961 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1962
1963 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1964}
1965
1966static struct pernet_operations geneve_net_ops = {
1967 .init = geneve_init_net,
1968 .exit_rtnl = geneve_exit_rtnl_net,
1969 .exit = geneve_exit_net,
1970 .id = &geneve_net_id,
1971 .size = sizeof(struct geneve_net),
1972};
1973
1974static int __init geneve_init_module(void)
1975{
1976 int rc;
1977
1978 rc = register_pernet_subsys(&geneve_net_ops);
1979 if (rc)
1980 goto out1;
1981
1982 rc = register_netdevice_notifier(&geneve_notifier_block);
1983 if (rc)
1984 goto out2;
1985
1986 rc = rtnl_link_register(&geneve_link_ops);
1987 if (rc)
1988 goto out3;
1989
1990 return 0;
1991out3:
1992 unregister_netdevice_notifier(&geneve_notifier_block);
1993out2:
1994 unregister_pernet_subsys(&geneve_net_ops);
1995out1:
1996 return rc;
1997}
1998late_initcall(geneve_init_module);
1999
2000static void __exit geneve_cleanup_module(void)
2001{
2002 rtnl_link_unregister(&geneve_link_ops);
2003 unregister_netdevice_notifier(&geneve_notifier_block);
2004 unregister_pernet_subsys(&geneve_net_ops);
2005}
2006module_exit(geneve_cleanup_module);
2007
2008MODULE_LICENSE("GPL");
2009MODULE_VERSION(GENEVE_NETDEV_VER);
2010MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
2011MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
2012MODULE_ALIAS_RTNL_LINK("geneve");
Linux 6.x block layer and io_uring tree(s)