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net: use core MTU range checking in WAN drivers
[linux-block.git] / drivers / net / geneve.c
CommitLineData
2d07dc79
JL		 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>
2d07dc79
JL		 15#include <linux/etherdevice.h>
16#include <linux/hash.h>
e305ac6c 17#include <net/dst_metadata.h>
8e816df8 18#include <net/gro_cells.h>
2d07dc79
JL		 19#include <net/rtnetlink.h>
20#include <net/geneve.h>
371bd106 21#include <net/protocol.h>
2d07dc79
JL		 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
371bd106
PS		 37#define GENEVE_VER 0
38#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
39
2d07dc79
JL		 40/* per-network namespace private data for this module */
41struct geneve_net {
371bd106 42 struct list_head geneve_list;
371bd106 43 struct list_head sock_list;
2d07dc79
JL		 44};
45
371bd106
PS		 46static int geneve_net_id;
47
8ed66f0e
JL		 48union geneve_addr {
49 struct sockaddr_in sin;
50 struct sockaddr_in6 sin6;
51 struct sockaddr sa;
52};
53
54static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
55
2d07dc79
JL		 56/* Pseudo network device */
57struct geneve_dev {
58 struct hlist_node hlist; /* vni hash table */
59 struct net *net; /* netns for packet i/o */
60 struct net_device *dev; /* netdev for geneve tunnel */
8ed66f0e
JL		 61 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
62#if IS_ENABLED(CONFIG_IPV6)
63 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
64#endif
8760ce58
JL		 65 u8 vni[3]; /* virtual network ID for tunnel */
66 u8 ttl; /* TTL override */
d8951125 67 u8 tos; /* TOS override */
8ed66f0e 68 union geneve_addr remote; /* IP address for link partner */
2d07dc79 69 struct list_head next; /* geneve's per namespace list */
8eb3b995 70 __be32 label; /* IPv6 flowlabel override */
cd7918b3 71 __be16 dst_port;
e305ac6c 72 bool collect_md;
8e816df8 73 struct gro_cells gro_cells;
abe492b4 74 u32 flags;
468dfffc 75 struct dst_cache dst_cache;
2d07dc79
JL		 76};
77
abe492b4 78/* Geneve device flags */
14f1f724 79#define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
abe492b4
TH		 80#define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
81#define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
82
371bd106
PS		 83struct geneve_sock {
84 bool collect_md;
371bd106
PS		 85 struct list_head list;
86 struct socket *sock;
87 struct rcu_head rcu;
88 int refcnt;
66d47003 89 struct hlist_head vni_list[VNI_HASH_SIZE];
abe492b4 90 u32 flags;
371bd106 91};
2d07dc79
JL		 92
93static inline __u32 geneve_net_vni_hash(u8 vni[3])
94{
95 __u32 vnid;
96
97 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
98 return hash_32(vnid, VNI_HASH_BITS);
99}
100
e305ac6c
PS		 101static __be64 vni_to_tunnel_id(const __u8 *vni)
102{
103#ifdef __BIG_ENDIAN
104 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
105#else
106 return (__force __be64)(((__force u64)vni[0] << 40) |
107 ((__force u64)vni[1] << 48) |
108 ((__force u64)vni[2] << 56));
109#endif
110}
111
1e9f12ec
JB		 112static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
113{
114 return gs->sock->sk->sk_family;
115}
116
66d47003 117static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
371bd106 118 __be32 addr, u8 vni[])
2d07dc79 119{
2d07dc79 120 struct hlist_head *vni_list_head;
e305ac6c 121 struct geneve_dev *geneve;
2d07dc79
JL		 122 __u32 hash;
123
2d07dc79 124 /* Find the device for this VNI */
371bd106 125 hash = geneve_net_vni_hash(vni);
66d47003 126 vni_list_head = &gs->vni_list[hash];
e305ac6c 127 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
371bd106 128 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
8ed66f0e
JL		 129 addr == geneve->remote.sin.sin_addr.s_addr)
130 return geneve;
131 }
132 return NULL;
133}
134
135#if IS_ENABLED(CONFIG_IPV6)
136static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
137 struct in6_addr addr6, u8 vni[])
138{
139 struct hlist_head *vni_list_head;
140 struct geneve_dev *geneve;
141 __u32 hash;
142
143 /* Find the device for this VNI */
144 hash = geneve_net_vni_hash(vni);
145 vni_list_head = &gs->vni_list[hash];
146 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
147 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
148 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
e305ac6c 149 return geneve;
2d07dc79 150 }
e305ac6c
PS		 151 return NULL;
152}
8ed66f0e 153#endif
e305ac6c 154
371bd106
PS		 155static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
156{
157 return (struct genevehdr *)(udp_hdr(skb) + 1);
158}
159
9fc47545
JB		 160static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
161 struct sk_buff *skb)
e305ac6c 162{
9fc47545 163 u8 *vni;
371bd106 164 __be32 addr;
8ed66f0e 165 static u8 zero_vni[3];
8ed66f0e 166#if IS_ENABLED(CONFIG_IPV6)
8ed66f0e
JL		 167 static struct in6_addr zero_addr6;
168#endif
e305ac6c 169
1e9f12ec 170 if (geneve_get_sk_family(gs) == AF_INET) {
9fc47545
JB		 171 struct iphdr *iph;
172
8ed66f0e 173 iph = ip_hdr(skb); /* outer IP header... */
371bd106 174
8ed66f0e
JL		 175 if (gs->collect_md) {
176 vni = zero_vni;
177 addr = 0;
178 } else {
9fc47545 179 vni = geneve_hdr(skb)->vni;
8ed66f0e
JL		 180 addr = iph->saddr;
181 }
182
9fc47545 183 return geneve_lookup(gs, addr, vni);
8ed66f0e 184#if IS_ENABLED(CONFIG_IPV6)
1e9f12ec 185 } else if (geneve_get_sk_family(gs) == AF_INET6) {
9fc47545
JB		 186 struct ipv6hdr *ip6h;
187 struct in6_addr addr6;
188
8ed66f0e 189 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
371bd106 190
8ed66f0e
JL		 191 if (gs->collect_md) {
192 vni = zero_vni;
193 addr6 = zero_addr6;
194 } else {
9fc47545 195 vni = geneve_hdr(skb)->vni;
8ed66f0e
JL		 196 addr6 = ip6h->saddr;
197 }
198
9fc47545 199 return geneve6_lookup(gs, addr6, vni);
8ed66f0e
JL		 200#endif
201 }
9fc47545
JB		 202 return NULL;
203}
204
205/* geneve receive/decap routine */
206static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
207 struct sk_buff *skb)
208{
209 struct genevehdr *gnvh = geneve_hdr(skb);
210 struct metadata_dst *tun_dst = NULL;
211 struct pcpu_sw_netstats *stats;
212 int err = 0;
213 void *oiph;
2d07dc79 214
371bd106 215 if (ip_tunnel_collect_metadata() || gs->collect_md) {
e305ac6c 216 __be16 flags;
e305ac6c
PS		 217
218 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
219 (gnvh->oam ? TUNNEL_OAM : 0) |
220 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
221
1e9f12ec 222 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
e305ac6c
PS		 223 vni_to_tunnel_id(gnvh->vni),
224 gnvh->opt_len * 4);
225 if (!tun_dst)
226 goto drop;
e305ac6c 227 /* Update tunnel dst according to Geneve options. */
4c222798
PS		 228 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
229 gnvh->options, gnvh->opt_len * 4);
e305ac6c
PS		 230 } else {
231 /* Drop packets w/ critical options,
232 * since we don't support any...
233 */
234 if (gnvh->critical)
235 goto drop;
236 }
2d07dc79
JL		 237
238 skb_reset_mac_header(skb);
2d07dc79
JL		 239 skb->protocol = eth_type_trans(skb, geneve->dev);
240 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
241
e305ac6c
PS		 242 if (tun_dst)
243 skb_dst_set(skb, &tun_dst->dst);
244
2d07dc79
JL		 245 /* Ignore packet loops (and multicast echo) */
246 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
247 goto drop;
248
9fc47545 249 oiph = skb_network_header(skb);
2d07dc79
JL		 250 skb_reset_network_header(skb);
251
9fc47545
JB		 252 if (geneve_get_sk_family(gs) == AF_INET)
253 err = IP_ECN_decapsulate(oiph, skb);
8ed66f0e 254#if IS_ENABLED(CONFIG_IPV6)
9fc47545
JB		 255 else
256 err = IP6_ECN_decapsulate(oiph, skb);
8ed66f0e 257#endif
2d07dc79
JL		 258
259 if (unlikely(err)) {
8ed66f0e 260 if (log_ecn_error) {
9fc47545 261 if (geneve_get_sk_family(gs) == AF_INET)
8ed66f0e
JL		 262 net_info_ratelimited("non-ECT from %pI4 "
263 "with TOS=%#x\n",
9fc47545
JB		 264 &((struct iphdr *)oiph)->saddr,
265 ((struct iphdr *)oiph)->tos);
8ed66f0e 266#if IS_ENABLED(CONFIG_IPV6)
9fc47545 267 else
8ed66f0e 268 net_info_ratelimited("non-ECT from %pI6\n",
9fc47545 269 &((struct ipv6hdr *)oiph)->saddr);
8ed66f0e
JL		 270#endif
271 }
2d07dc79
JL		 272 if (err > 1) {
273 ++geneve->dev->stats.rx_frame_errors;
274 ++geneve->dev->stats.rx_errors;
275 goto drop;
276 }
277 }
278
279 stats = this_cpu_ptr(geneve->dev->tstats);
280 u64_stats_update_begin(&stats->syncp);
281 stats->rx_packets++;
282 stats->rx_bytes += skb->len;
283 u64_stats_update_end(&stats->syncp);
284
8e816df8 285 gro_cells_receive(&geneve->gro_cells, skb);
2d07dc79
JL		 286 return;
287drop:
288 /* Consume bad packet */
289 kfree_skb(skb);
290}
291
292/* Setup stats when device is created */
293static int geneve_init(struct net_device *dev)
294{
8e816df8
JG		 295 struct geneve_dev *geneve = netdev_priv(dev);
296 int err;
297
2d07dc79
JL		 298 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
299 if (!dev->tstats)
300 return -ENOMEM;
8e816df8
JG		 301
302 err = gro_cells_init(&geneve->gro_cells, dev);
303 if (err) {
304 free_percpu(dev->tstats);
305 return err;
306 }
307
468dfffc
PA		 308 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
309 if (err) {
310 free_percpu(dev->tstats);
311 gro_cells_destroy(&geneve->gro_cells);
312 return err;
313 }
314
2d07dc79
JL		 315 return 0;
316}
317
318static void geneve_uninit(struct net_device *dev)
319{
8e816df8
JG		 320 struct geneve_dev *geneve = netdev_priv(dev);
321
468dfffc 322 dst_cache_destroy(&geneve->dst_cache);
8e816df8 323 gro_cells_destroy(&geneve->gro_cells);
2d07dc79
JL		 324 free_percpu(dev->tstats);
325}
326
371bd106
PS		 327/* Callback from net/ipv4/udp.c to receive packets */
328static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
329{
330 struct genevehdr *geneveh;
9fc47545 331 struct geneve_dev *geneve;
371bd106
PS		 332 struct geneve_sock *gs;
333 int opts_len;
334
335 /* Need Geneve and inner Ethernet header to be present */
336 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
e5aed006 337 goto drop;
371bd106
PS		 338
339 /* Return packets with reserved bits set */
340 geneveh = geneve_hdr(skb);
341 if (unlikely(geneveh->ver != GENEVE_VER))
e5aed006 342 goto drop;
371bd106
PS		 343
344 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
e5aed006 345 goto drop;
371bd106 346
9fc47545
JB		 347 gs = rcu_dereference_sk_user_data(sk);
348 if (!gs)
349 goto drop;
350
351 geneve = geneve_lookup_skb(gs, skb);
352 if (!geneve)
353 goto drop;
354
371bd106
PS		 355 opts_len = geneveh->opt_len * 4;
356 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
7f290c94
JB		 357 htons(ETH_P_TEB),
358 !net_eq(geneve->net, dev_net(geneve->dev))))
371bd106
PS		 359 goto drop;
360
9fc47545 361 geneve_rx(geneve, gs, skb);
371bd106
PS		 362 return 0;
363
364drop:
365 /* Consume bad packet */
366 kfree_skb(skb);
367 return 0;
371bd106
PS		 368}
369
370static struct socket *geneve_create_sock(struct net *net, bool ipv6,
abe492b4 371 __be16 port, u32 flags)
371bd106
PS		 372{
373 struct socket *sock;
374 struct udp_port_cfg udp_conf;
375 int err;
376
377 memset(&udp_conf, 0, sizeof(udp_conf));
378
379 if (ipv6) {
380 udp_conf.family = AF_INET6;
8ed66f0e 381 udp_conf.ipv6_v6only = 1;
abe492b4
TH		 382 udp_conf.use_udp6_rx_checksums =
383 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
371bd106
PS		 384 } else {
385 udp_conf.family = AF_INET;
386 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
387 }
388
389 udp_conf.local_udp_port = port;
390
391 /* Open UDP socket */
392 err = udp_sock_create(net, &udp_conf, &sock);
393 if (err < 0)
394 return ERR_PTR(err);
395
396 return sock;
397}
398
371bd106
PS		 399static int geneve_hlen(struct genevehdr *gh)
400{
401 return sizeof(*gh) + gh->opt_len * 4;
402}
403
4a0090a9
TH		 404static struct sk_buff **geneve_gro_receive(struct sock *sk,
405 struct sk_buff **head,
406 struct sk_buff *skb)
371bd106
PS		 407{
408 struct sk_buff *p, **pp = NULL;
409 struct genevehdr *gh, *gh2;
410 unsigned int hlen, gh_len, off_gnv;
411 const struct packet_offload *ptype;
412 __be16 type;
413 int flush = 1;
414
415 off_gnv = skb_gro_offset(skb);
416 hlen = off_gnv + sizeof(*gh);
417 gh = skb_gro_header_fast(skb, off_gnv);
418 if (skb_gro_header_hard(skb, hlen)) {
419 gh = skb_gro_header_slow(skb, hlen, off_gnv);
420 if (unlikely(!gh))
421 goto out;
422 }
423
424 if (gh->ver != GENEVE_VER || gh->oam)
425 goto out;
426 gh_len = geneve_hlen(gh);
427
428 hlen = off_gnv + gh_len;
429 if (skb_gro_header_hard(skb, hlen)) {
430 gh = skb_gro_header_slow(skb, hlen, off_gnv);
431 if (unlikely(!gh))
432 goto out;
433 }
434
371bd106
PS		 435 for (p = *head; p; p = p->next) {
436 if (!NAPI_GRO_CB(p)->same_flow)
437 continue;
438
439 gh2 = (struct genevehdr *)(p->data + off_gnv);
440 if (gh->opt_len != gh2->opt_len ||
441 memcmp(gh, gh2, gh_len)) {
442 NAPI_GRO_CB(p)->same_flow = 0;
443 continue;
444 }
445 }
446
447 type = gh->proto_type;
448
449 rcu_read_lock();
450 ptype = gro_find_receive_by_type(type);
c194cf93 451 if (!ptype)
371bd106 452 goto out_unlock;
371bd106
PS		 453
454 skb_gro_pull(skb, gh_len);
455 skb_gro_postpull_rcsum(skb, gh, gh_len);
456 pp = ptype->callbacks.gro_receive(head, skb);
c194cf93 457 flush = 0;
371bd106
PS		 458
459out_unlock:
460 rcu_read_unlock();
461out:
462 NAPI_GRO_CB(skb)->flush |= flush;
463
464 return pp;
465}
466
4a0090a9
TH		 467static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
468 int nhoff)
371bd106
PS		 469{
470 struct genevehdr *gh;
471 struct packet_offload *ptype;
472 __be16 type;
473 int gh_len;
474 int err = -ENOSYS;
475
371bd106
PS		 476 gh = (struct genevehdr *)(skb->data + nhoff);
477 gh_len = geneve_hlen(gh);
478 type = gh->proto_type;
479
480 rcu_read_lock();
481 ptype = gro_find_complete_by_type(type);
482 if (ptype)
483 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
484
485 rcu_read_unlock();
229740c6
JR		 486
487 skb_set_inner_mac_header(skb, nhoff + gh_len);
488
371bd106
PS		 489 return err;
490}
491
492/* Create new listen socket if needed */
493static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
abe492b4 494 bool ipv6, u32 flags)
371bd106
PS		 495{
496 struct geneve_net *gn = net_generic(net, geneve_net_id);
497 struct geneve_sock *gs;
498 struct socket *sock;
499 struct udp_tunnel_sock_cfg tunnel_cfg;
66d47003 500 int h;
371bd106
PS		 501
502 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
503 if (!gs)
504 return ERR_PTR(-ENOMEM);
505
abe492b4 506 sock = geneve_create_sock(net, ipv6, port, flags);
371bd106
PS		 507 if (IS_ERR(sock)) {
508 kfree(gs);
509 return ERR_CAST(sock);
510 }
511
512 gs->sock = sock;
513 gs->refcnt = 1;
66d47003
PS		 514 for (h = 0; h < VNI_HASH_SIZE; ++h)
515 INIT_HLIST_HEAD(&gs->vni_list[h]);
371bd106
PS		 516
517 /* Initialize the geneve udp offloads structure */
e7b3db5e 518 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
371bd106
PS		 519
520 /* Mark socket as an encapsulation socket */
4a0090a9 521 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
371bd106
PS		 522 tunnel_cfg.sk_user_data = gs;
523 tunnel_cfg.encap_type = 1;
4a0090a9
TH		 524 tunnel_cfg.gro_receive = geneve_gro_receive;
525 tunnel_cfg.gro_complete = geneve_gro_complete;
371bd106
PS		 526 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
527 tunnel_cfg.encap_destroy = NULL;
528 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
371bd106
PS		 529 list_add(&gs->list, &gn->sock_list);
530 return gs;
531}
532
8ed66f0e 533static void __geneve_sock_release(struct geneve_sock *gs)
371bd106 534{
8ed66f0e 535 if (!gs || --gs->refcnt)
371bd106
PS		 536 return;
537
538 list_del(&gs->list);
e7b3db5e 539 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
371bd106
PS		 540 udp_tunnel_sock_release(gs->sock);
541 kfree_rcu(gs, rcu);
542}
543
8ed66f0e
JL		 544static void geneve_sock_release(struct geneve_dev *geneve)
545{
546 __geneve_sock_release(geneve->sock4);
547#if IS_ENABLED(CONFIG_IPV6)
548 __geneve_sock_release(geneve->sock6);
549#endif
550}
551
371bd106 552static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
8ed66f0e 553 sa_family_t family,
371bd106
PS		 554 __be16 dst_port)
555{
556 struct geneve_sock *gs;
557
558 list_for_each_entry(gs, &gn->sock_list, list) {
559 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
1e9f12ec 560 geneve_get_sk_family(gs) == family) {
371bd106
PS		 561 return gs;
562 }
563 }
564 return NULL;
565}
566
8ed66f0e 567static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
2d07dc79 568{
2d07dc79 569 struct net *net = geneve->net;
371bd106 570 struct geneve_net *gn = net_generic(net, geneve_net_id);
2d07dc79 571 struct geneve_sock *gs;
66d47003 572 __u32 hash;
2d07dc79 573
8ed66f0e 574 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
371bd106
PS		 575 if (gs) {
576 gs->refcnt++;
577 goto out;
578 }
579
abe492b4 580 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
2d07dc79
JL		 581 if (IS_ERR(gs))
582 return PTR_ERR(gs);
583
371bd106
PS		 584out:
585 gs->collect_md = geneve->collect_md;
abe492b4 586 gs->flags = geneve->flags;
8ed66f0e
JL		 587#if IS_ENABLED(CONFIG_IPV6)
588 if (ipv6)
589 geneve->sock6 = gs;
590 else
591#endif
592 geneve->sock4 = gs;
66d47003
PS		 593
594 hash = geneve_net_vni_hash(geneve->vni);
595 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
2d07dc79
JL		 596 return 0;
597}
598
8ed66f0e
JL		 599static int geneve_open(struct net_device *dev)
600{
601 struct geneve_dev *geneve = netdev_priv(dev);
602 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
603 bool metadata = geneve->collect_md;
604 int ret = 0;
605
606 geneve->sock4 = NULL;
607#if IS_ENABLED(CONFIG_IPV6)
608 geneve->sock6 = NULL;
609 if (ipv6 || metadata)
610 ret = geneve_sock_add(geneve, true);
611#endif
612 if (!ret && (!ipv6 || metadata))
613 ret = geneve_sock_add(geneve, false);
614 if (ret < 0)
615 geneve_sock_release(geneve);
616
617 return ret;
618}
619
2d07dc79
JL		 620static int geneve_stop(struct net_device *dev)
621{
622 struct geneve_dev *geneve = netdev_priv(dev);
2d07dc79 623
66d47003
PS		 624 if (!hlist_unhashed(&geneve->hlist))
625 hlist_del_rcu(&geneve->hlist);
8ed66f0e 626 geneve_sock_release(geneve);
371bd106
PS		 627 return 0;
628}
629
8ed66f0e
JL		 630static void geneve_build_header(struct genevehdr *geneveh,
631 __be16 tun_flags, u8 vni[3],
632 u8 options_len, u8 *options)
633{
634 geneveh->ver = GENEVE_VER;
635 geneveh->opt_len = options_len / 4;
636 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
637 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
638 geneveh->rsvd1 = 0;
639 memcpy(geneveh->vni, vni, 3);
640 geneveh->proto_type = htons(ETH_P_TEB);
641 geneveh->rsvd2 = 0;
642
643 memcpy(geneveh->options, options, options_len);
644}
645
371bd106
PS		 646static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
647 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
abe492b4 648 u32 flags, bool xnet)
371bd106
PS		 649{
650 struct genevehdr *gnvh;
651 int min_headroom;
652 int err;
14f1f724 653 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
2d07dc79 654
8ed66f0e
JL		 655 skb_scrub_packet(skb, xnet);
656
371bd106
PS		 657 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
658 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
659 err = skb_cow_head(skb, min_headroom);
aed069df 660 if (unlikely(err))
371bd106 661 goto free_rt;
371bd106 662
aed069df
AD		 663 err = udp_tunnel_handle_offloads(skb, udp_sum);
664 if (err)
371bd106 665 goto free_rt;
371bd106
PS		 666
667 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
8ed66f0e 668 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
371bd106
PS		 669
670 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
2d07dc79 671 return 0;
371bd106
PS		 672
673free_rt:
674 ip_rt_put(rt);
675 return err;
2d07dc79
JL		 676}
677
8ed66f0e
JL		 678#if IS_ENABLED(CONFIG_IPV6)
679static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
680 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
abe492b4 681 u32 flags, bool xnet)
8ed66f0e
JL		 682{
683 struct genevehdr *gnvh;
684 int min_headroom;
685 int err;
abe492b4 686 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
8ed66f0e
JL		 687
688 skb_scrub_packet(skb, xnet);
689
690 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
691 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
692 err = skb_cow_head(skb, min_headroom);
aed069df 693 if (unlikely(err))
8ed66f0e 694 goto free_dst;
8ed66f0e 695
aed069df 696 err = udp_tunnel_handle_offloads(skb, udp_sum);
1ba64fac 697 if (err)
8ed66f0e 698 goto free_dst;
8ed66f0e
JL		 699
700 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
701 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
702
703 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
704 return 0;
705
706free_dst:
707 dst_release(dst);
708 return err;
709}
710#endif
711
712static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
713 struct net_device *dev,
714 struct flowi4 *fl4,
715 struct ip_tunnel_info *info)
e305ac6c 716{
db3c6139 717 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
e305ac6c 718 struct geneve_dev *geneve = netdev_priv(dev);
468dfffc 719 struct dst_cache *dst_cache;
e305ac6c
PS		 720 struct rtable *rt = NULL;
721 __u8 tos;
722
723 memset(fl4, 0, sizeof(*fl4));
724 fl4->flowi4_mark = skb->mark;
725 fl4->flowi4_proto = IPPROTO_UDP;
726
727 if (info) {
728 fl4->daddr = info->key.u.ipv4.dst;
729 fl4->saddr = info->key.u.ipv4.src;
730 fl4->flowi4_tos = RT_TOS(info->key.tos);
468dfffc 731 dst_cache = &info->dst_cache;
e305ac6c
PS		 732 } else {
733 tos = geneve->tos;
734 if (tos == 1) {
735 const struct iphdr *iip = ip_hdr(skb);
736
737 tos = ip_tunnel_get_dsfield(iip, skb);
468dfffc 738 use_cache = false;
e305ac6c
PS		 739 }
740
741 fl4->flowi4_tos = RT_TOS(tos);
8ed66f0e 742 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
468dfffc
PA		 743 dst_cache = &geneve->dst_cache;
744 }
745
468dfffc
PA		 746 if (use_cache) {
747 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
748 if (rt)
749 return rt;
e305ac6c
PS		 750 }
751
752 rt = ip_route_output_key(geneve->net, fl4);
753 if (IS_ERR(rt)) {
754 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
fc4099f1 755 return ERR_PTR(-ENETUNREACH);
e305ac6c
PS		 756 }
757 if (rt->dst.dev == dev) { /* is this necessary? */
758 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
e305ac6c 759 ip_rt_put(rt);
fc4099f1 760 return ERR_PTR(-ELOOP);
e305ac6c 761 }
468dfffc
PA		 762 if (use_cache)
763 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
e305ac6c
PS		 764 return rt;
765}
766
8ed66f0e
JL		 767#if IS_ENABLED(CONFIG_IPV6)
768static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
769 struct net_device *dev,
770 struct flowi6 *fl6,
771 struct ip_tunnel_info *info)
772{
db3c6139 773 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
8ed66f0e
JL		 774 struct geneve_dev *geneve = netdev_priv(dev);
775 struct geneve_sock *gs6 = geneve->sock6;
776 struct dst_entry *dst = NULL;
468dfffc 777 struct dst_cache *dst_cache;
3a56f86f 778 __u8 prio;
8ed66f0e
JL		 779
780 memset(fl6, 0, sizeof(*fl6));
781 fl6->flowi6_mark = skb->mark;
782 fl6->flowi6_proto = IPPROTO_UDP;
783
784 if (info) {
785 fl6->daddr = info->key.u.ipv6.dst;
786 fl6->saddr = info->key.u.ipv6.src;
95caf6f7
DB		 787 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
788 info->key.label);
468dfffc 789 dst_cache = &info->dst_cache;
8ed66f0e 790 } else {
3a56f86f
JL		 791 prio = geneve->tos;
792 if (prio == 1) {
793 const struct iphdr *iip = ip_hdr(skb);
794
795 prio = ip_tunnel_get_dsfield(iip, skb);
468dfffc 796 use_cache = false;
3a56f86f
JL		 797 }
798
95caf6f7
DB		 799 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
800 geneve->label);
8ed66f0e 801 fl6->daddr = geneve->remote.sin6.sin6_addr;
468dfffc
PA		 802 dst_cache = &geneve->dst_cache;
803 }
804
468dfffc
PA		 805 if (use_cache) {
806 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
807 if (dst)
808 return dst;
8ed66f0e
JL		 809 }
810
811 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
812 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
813 return ERR_PTR(-ENETUNREACH);
814 }
815 if (dst->dev == dev) { /* is this necessary? */
816 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
817 dst_release(dst);
818 return ERR_PTR(-ELOOP);
819 }
820
468dfffc
PA		 821 if (use_cache)
822 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
8ed66f0e
JL		 823 return dst;
824}
825#endif
826
e305ac6c
PS		 827/* Convert 64 bit tunnel ID to 24 bit VNI. */
828static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
829{
830#ifdef __BIG_ENDIAN
831 vni[0] = (__force __u8)(tun_id >> 16);
832 vni[1] = (__force __u8)(tun_id >> 8);
833 vni[2] = (__force __u8)tun_id;
834#else
835 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
836 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
837 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
838#endif
839}
840
8ed66f0e
JL		 841static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
842 struct ip_tunnel_info *info)
2d07dc79
JL		 843{
844 struct geneve_dev *geneve = netdev_priv(dev);
8ed66f0e 845 struct geneve_sock *gs4 = geneve->sock4;
2d07dc79 846 struct rtable *rt = NULL;
08399efc 847 const struct iphdr *iip; /* interior IP header */
fc4099f1 848 int err = -EINVAL;
2d07dc79 849 struct flowi4 fl4;
8760ce58 850 __u8 tos, ttl;
e305ac6c 851 __be16 sport;
371bd106 852 __be16 df;
8ed66f0e 853 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
abe492b4 854 u32 flags = geneve->flags;
2d07dc79 855
e305ac6c 856 if (geneve->collect_md) {
8ed66f0e 857 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
e305ac6c
PS		 858 netdev_dbg(dev, "no tunnel metadata\n");
859 goto tx_error;
860 }
7f9562a1
JB		 861 if (info && ip_tunnel_info_af(info) != AF_INET)
862 goto tx_error;
e305ac6c 863 }
980c394c 864
8ed66f0e 865 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
2d07dc79 866 if (IS_ERR(rt)) {
fc4099f1 867 err = PTR_ERR(rt);
2d07dc79
JL		 868 goto tx_error;
869 }
371bd106
PS		 870
871 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
e305ac6c 872 skb_reset_mac_header(skb);
e305ac6c 873
08399efc
JL		 874 iip = ip_hdr(skb);
875
e305ac6c
PS		 876 if (info) {
877 const struct ip_tunnel_key *key = &info->key;
e305ac6c
PS		 878 u8 *opts = NULL;
879 u8 vni[3];
e305ac6c
PS		 880
881 tunnel_id_to_vni(key->tun_id, vni);
14ca0751 882 if (info->options_len)
4c222798 883 opts = ip_tunnel_info_opts(info);
e305ac6c 884
abe492b4 885 if (key->tun_flags & TUNNEL_CSUM)
14f1f724 886 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
abe492b4 887 else
14f1f724 888 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
abe492b4 889
371bd106 890 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
abe492b4 891 info->options_len, opts, flags, xnet);
371bd106 892 if (unlikely(err))
aed069df 893 goto tx_error;
371bd106 894
08399efc 895 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
371bd106
PS		 896 ttl = key->ttl;
897 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
e305ac6c 898 } else {
371bd106 899 err = geneve_build_skb(rt, skb, 0, geneve->vni,
abe492b4 900 0, NULL, flags, xnet);
371bd106 901 if (unlikely(err))
aed069df 902 goto tx_error;
371bd106 903
e305ac6c 904 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
e305ac6c
PS		 905 ttl = geneve->ttl;
906 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
907 ttl = 1;
e305ac6c 908 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
371bd106 909 df = 0;
2d07dc79 910 }
039f5062
PS		 911 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
912 tos, ttl, df, sport, geneve->dst_port,
913 !net_eq(geneve->net, dev_net(geneve->dev)),
14f1f724 914 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
2d07dc79 915
2d07dc79
JL		 916 return NETDEV_TX_OK;
917
2d07dc79 918tx_error:
2d07dc79 919 dev_kfree_skb(skb);
aed069df 920
fc4099f1
PS		 921 if (err == -ELOOP)
922 dev->stats.collisions++;
923 else if (err == -ENETUNREACH)
924 dev->stats.tx_carrier_errors++;
efeb2267
HY		 925
926 dev->stats.tx_errors++;
2d07dc79
JL		 927 return NETDEV_TX_OK;
928}
929
8ed66f0e
JL		 930#if IS_ENABLED(CONFIG_IPV6)
931static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
932 struct ip_tunnel_info *info)
933{
934 struct geneve_dev *geneve = netdev_priv(dev);
935 struct geneve_sock *gs6 = geneve->sock6;
936 struct dst_entry *dst = NULL;
3a56f86f 937 const struct iphdr *iip; /* interior IP header */
8ed66f0e
JL		 938 int err = -EINVAL;
939 struct flowi6 fl6;
3a56f86f 940 __u8 prio, ttl;
8ed66f0e 941 __be16 sport;
8eb3b995 942 __be32 label;
8ed66f0e 943 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
abe492b4 944 u32 flags = geneve->flags;
8ed66f0e
JL		 945
946 if (geneve->collect_md) {
947 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
948 netdev_dbg(dev, "no tunnel metadata\n");
949 goto tx_error;
950 }
951 }
952
953 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
954 if (IS_ERR(dst)) {
955 err = PTR_ERR(dst);
956 goto tx_error;
957 }
958
959 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
960 skb_reset_mac_header(skb);
961
3a56f86f
JL		 962 iip = ip_hdr(skb);
963
8ed66f0e
JL		 964 if (info) {
965 const struct ip_tunnel_key *key = &info->key;
966 u8 *opts = NULL;
967 u8 vni[3];
968
969 tunnel_id_to_vni(key->tun_id, vni);
14ca0751 970 if (info->options_len)
8ed66f0e
JL		 971 opts = ip_tunnel_info_opts(info);
972
abe492b4 973 if (key->tun_flags & TUNNEL_CSUM)
35e2d115 974 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
abe492b4 975 else
35e2d115 976 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
abe492b4 977
8ed66f0e
JL		 978 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
979 info->options_len, opts,
abe492b4 980 flags, xnet);
8ed66f0e 981 if (unlikely(err))
aed069df 982 goto tx_error;
8ed66f0e 983
3a56f86f 984 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
8ed66f0e 985 ttl = key->ttl;
8eb3b995 986 label = info->key.label;
8ed66f0e 987 } else {
8ed66f0e 988 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
abe492b4 989 0, NULL, flags, xnet);
8ed66f0e 990 if (unlikely(err))
aed069df 991 goto tx_error;
8ed66f0e 992
95caf6f7
DB		 993 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
994 iip, skb);
8ed66f0e
JL		 995 ttl = geneve->ttl;
996 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
997 ttl = 1;
998 ttl = ttl ? : ip6_dst_hoplimit(dst);
8eb3b995 999 label = geneve->label;
8ed66f0e 1000 }
8eb3b995 1001
039f5062 1002 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
8eb3b995 1003 &fl6.saddr, &fl6.daddr, prio, ttl, label,
039f5062
PS		 1004 sport, geneve->dst_port,
1005 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
8ed66f0e
JL		 1006 return NETDEV_TX_OK;
1007
1008tx_error:
1009 dev_kfree_skb(skb);
aed069df 1010
8ed66f0e
JL		 1011 if (err == -ELOOP)
1012 dev->stats.collisions++;
1013 else if (err == -ENETUNREACH)
1014 dev->stats.tx_carrier_errors++;
efeb2267
HY		 1015
1016 dev->stats.tx_errors++;
8ed66f0e
JL		 1017 return NETDEV_TX_OK;
1018}
1019#endif
1020
1021static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1022{
1023 struct geneve_dev *geneve = netdev_priv(dev);
1024 struct ip_tunnel_info *info = NULL;
1025
1026 if (geneve->collect_md)
1027 info = skb_tunnel_info(skb);
1028
1029#if IS_ENABLED(CONFIG_IPV6)
1030 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1031 (!info && geneve->remote.sa.sa_family == AF_INET6))
1032 return geneve6_xmit_skb(skb, dev, info);
1033#endif
1034 return geneve_xmit_skb(skb, dev, info);
1035}
1036
aeee0e66 1037static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
55e5bfb5 1038{
d5d5e8d5 1039 struct geneve_dev *geneve = netdev_priv(dev);
aeee0e66
DW		 1040 /* The max_mtu calculation does not take account of GENEVE
1041 * options, to avoid excluding potentially valid
1042 * configurations.
55e5bfb5 1043 */
d5d5e8d5
HY		 1044 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1045
1046 if (geneve->remote.sa.sa_family == AF_INET6)
1047 max_mtu -= sizeof(struct ipv6hdr);
1048 else
1049 max_mtu -= sizeof(struct iphdr);
aeee0e66
DW		 1050
1051 if (new_mtu < 68)
55e5bfb5 1052 return -EINVAL;
aeee0e66
DW		 1053
1054 if (new_mtu > max_mtu) {
1055 if (strict)
1056 return -EINVAL;
1057
1058 new_mtu = max_mtu;
1059 }
1060
55e5bfb5
DW		 1061 dev->mtu = new_mtu;
1062 return 0;
1063}
1064
aeee0e66
DW		 1065static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1066{
1067 return __geneve_change_mtu(dev, new_mtu, true);
1068}
1069
fc4099f1
PS		 1070static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1071{
1072 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1073 struct geneve_dev *geneve = netdev_priv(dev);
1074 struct rtable *rt;
1075 struct flowi4 fl4;
b8812fa8
JL		 1076#if IS_ENABLED(CONFIG_IPV6)
1077 struct dst_entry *dst;
1078 struct flowi6 fl6;
1079#endif
fc4099f1 1080
b8812fa8
JL		 1081 if (ip_tunnel_info_af(info) == AF_INET) {
1082 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1083 if (IS_ERR(rt))
1084 return PTR_ERR(rt);
fc4099f1 1085
b8812fa8
JL		 1086 ip_rt_put(rt);
1087 info->key.u.ipv4.src = fl4.saddr;
1088#if IS_ENABLED(CONFIG_IPV6)
1089 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1090 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1091 if (IS_ERR(dst))
1092 return PTR_ERR(dst);
1093
1094 dst_release(dst);
1095 info->key.u.ipv6.src = fl6.saddr;
1096#endif
1097 } else {
1098 return -EINVAL;
1099 }
fc4099f1 1100
fc4099f1
PS		 1101 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1102 1, USHRT_MAX, true);
1103 info->key.tp_dst = geneve->dst_port;
1104 return 0;
1105}
1106
2d07dc79
JL		 1107static const struct net_device_ops geneve_netdev_ops = {
1108 .ndo_init = geneve_init,
1109 .ndo_uninit = geneve_uninit,
1110 .ndo_open = geneve_open,
1111 .ndo_stop = geneve_stop,
1112 .ndo_start_xmit = geneve_xmit,
1113 .ndo_get_stats64 = ip_tunnel_get_stats64,
55e5bfb5 1114 .ndo_change_mtu = geneve_change_mtu,
2d07dc79
JL		 1115 .ndo_validate_addr = eth_validate_addr,
1116 .ndo_set_mac_address = eth_mac_addr,
fc4099f1 1117 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
2d07dc79
JL		 1118};
1119
1120static void geneve_get_drvinfo(struct net_device *dev,
1121 struct ethtool_drvinfo *drvinfo)
1122{
1123 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1124 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1125}
1126
1127static const struct ethtool_ops geneve_ethtool_ops = {
1128 .get_drvinfo = geneve_get_drvinfo,
1129 .get_link = ethtool_op_get_link,
1130};
1131
1132/* Info for udev, that this is a virtual tunnel endpoint */
1133static struct device_type geneve_type = {
1134 .name = "geneve",
1135};
1136
e5de25dc 1137/* Calls the ndo_udp_tunnel_add of the caller in order to
05ca4029 1138 * supply the listening GENEVE udp ports. Callers are expected
e5de25dc 1139 * to implement the ndo_udp_tunnel_add.
05ca4029 1140 */
681e683f 1141static void geneve_push_rx_ports(struct net_device *dev)
05ca4029
SA		 1142{
1143 struct net *net = dev_net(dev);
1144 struct geneve_net *gn = net_generic(net, geneve_net_id);
1145 struct geneve_sock *gs;
681e683f 1146
05ca4029 1147 rcu_read_lock();
e7b3db5e
AD		 1148 list_for_each_entry_rcu(gs, &gn->sock_list, list)
1149 udp_tunnel_push_rx_port(dev, gs->sock,
1150 UDP_TUNNEL_TYPE_GENEVE);
05ca4029
SA		 1151 rcu_read_unlock();
1152}
05ca4029 1153
2d07dc79
JL		 1154/* Initialize the device structure. */
1155static void geneve_setup(struct net_device *dev)
1156{
1157 ether_setup(dev);
1158
1159 dev->netdev_ops = &geneve_netdev_ops;
1160 dev->ethtool_ops = &geneve_ethtool_ops;
1161 dev->destructor = free_netdev;
1162
1163 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1164
2d07dc79
JL		 1165 dev->features |= NETIF_F_LLTX;
1166 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1167 dev->features |= NETIF_F_RXCSUM;
1168 dev->features |= NETIF_F_GSO_SOFTWARE;
1169
2d07dc79
JL		 1170 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1171 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2d07dc79
JL		 1172
1173 netif_keep_dst(dev);
fc41cdb3 1174 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
ed961ac2 1175 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
87cd3dca 1176 eth_hw_addr_random(dev);
2d07dc79
JL		 1177}
1178
1179static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1180 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1181 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
8ed66f0e 1182 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
8760ce58 1183 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
d8951125 1184 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
8eb3b995 1185 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
cd7918b3 1186 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
e305ac6c 1187 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
abe492b4
TH		 1188 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1189 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1190 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2d07dc79
JL		 1191};
1192
1193static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1194{
1195 if (tb[IFLA_ADDRESS]) {
1196 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1197 return -EINVAL;
1198
1199 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1200 return -EADDRNOTAVAIL;
1201 }
1202
1203 if (!data)
1204 return -EINVAL;
1205
1206 if (data[IFLA_GENEVE_ID]) {
1207 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1208
1209 if (vni >= GENEVE_VID_MASK)
1210 return -ERANGE;
1211 }
1212
1213 return 0;
1214}
1215
371bd106
PS		 1216static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1217 __be16 dst_port,
8ed66f0e 1218 union geneve_addr *remote,
371bd106
PS		 1219 u8 vni[],
1220 bool *tun_on_same_port,
1221 bool *tun_collect_md)
1222{
1223 struct geneve_dev *geneve, *t;
1224
1225 *tun_on_same_port = false;
1226 *tun_collect_md = false;
1227 t = NULL;
1228 list_for_each_entry(geneve, &gn->geneve_list, next) {
1229 if (geneve->dst_port == dst_port) {
1230 *tun_collect_md = geneve->collect_md;
1231 *tun_on_same_port = true;
1232 }
1233 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
8ed66f0e 1234 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
371bd106
PS		 1235 dst_port == geneve->dst_port)
1236 t = geneve;
1237 }
1238 return t;
1239}
1240
e305ac6c 1241static int geneve_configure(struct net *net, struct net_device *dev,
8ed66f0e 1242 union geneve_addr *remote,
8eb3b995
DB		 1243 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1244 __be16 dst_port, bool metadata, u32 flags)
2d07dc79
JL		 1245{
1246 struct geneve_net *gn = net_generic(net, geneve_net_id);
371bd106
PS		 1247 struct geneve_dev *t, *geneve = netdev_priv(dev);
1248 bool tun_collect_md, tun_on_same_port;
184fc8b5 1249 int err, encap_len;
2d07dc79 1250
8ed66f0e
JL		 1251 if (!remote)
1252 return -EINVAL;
1253 if (metadata &&
8eb3b995 1254 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
8ed66f0e 1255 return -EINVAL;
2d07dc79
JL		 1256
1257 geneve->net = net;
1258 geneve->dev = dev;
1259
2d07dc79
JL		 1260 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1261 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1262 geneve->vni[2] = vni & 0x000000ff;
1263
8ed66f0e
JL		 1264 if ((remote->sa.sa_family == AF_INET &&
1265 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1266 (remote->sa.sa_family == AF_INET6 &&
1267 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
2d07dc79 1268 return -EINVAL;
8eb3b995
DB		 1269 if (label && remote->sa.sa_family != AF_INET6)
1270 return -EINVAL;
1271
8ed66f0e 1272 geneve->remote = *remote;
2d07dc79 1273
e305ac6c
PS		 1274 geneve->ttl = ttl;
1275 geneve->tos = tos;
8eb3b995 1276 geneve->label = label;
7bbe33ff 1277 geneve->dst_port = dst_port;
e305ac6c 1278 geneve->collect_md = metadata;
abe492b4 1279 geneve->flags = flags;
e305ac6c 1280
8ed66f0e 1281 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
371bd106
PS		 1282 &tun_on_same_port, &tun_collect_md);
1283 if (t)
1284 return -EBUSY;
1285
184fc8b5
PA		 1286 /* make enough headroom for basic scenario */
1287 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1288 if (remote->sa.sa_family == AF_INET)
1289 encap_len += sizeof(struct iphdr);
1290 else
1291 encap_len += sizeof(struct ipv6hdr);
1292 dev->needed_headroom = encap_len + ETH_HLEN;
1293
371bd106
PS		 1294 if (metadata) {
1295 if (tun_on_same_port)
1296 return -EPERM;
1297 } else {
1298 if (tun_collect_md)
1299 return -EPERM;
1300 }
1301
468dfffc
PA		 1302 dst_cache_reset(&geneve->dst_cache);
1303
2d07dc79
JL		 1304 err = register_netdevice(dev);
1305 if (err)
1306 return err;
1307
e305ac6c 1308 list_add(&geneve->next, &gn->geneve_list);
e305ac6c
PS		 1309 return 0;
1310}
1311
1312static int geneve_newlink(struct net *net, struct net_device *dev,
1313 struct nlattr *tb[], struct nlattr *data[])
1314{
7bbe33ff 1315 __be16 dst_port = htons(GENEVE_UDP_PORT);
e305ac6c
PS		 1316 __u8 ttl = 0, tos = 0;
1317 bool metadata = false;
8ed66f0e 1318 union geneve_addr remote = geneve_remote_unspec;
8eb3b995 1319 __be32 label = 0;
e277de5f 1320 __u32 vni = 0;
abe492b4 1321 u32 flags = 0;
e305ac6c 1322
8ed66f0e
JL		 1323 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1324 return -EINVAL;
1325
1326 if (data[IFLA_GENEVE_REMOTE]) {
1327 remote.sa.sa_family = AF_INET;
1328 remote.sin.sin_addr.s_addr =
1329 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1330 }
1331
1332 if (data[IFLA_GENEVE_REMOTE6]) {
1333 if (!IS_ENABLED(CONFIG_IPV6))
1334 return -EPFNOSUPPORT;
1335
1336 remote.sa.sa_family = AF_INET6;
1337 remote.sin6.sin6_addr =
1338 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1339
1340 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1341 IPV6_ADDR_LINKLOCAL) {
1342 netdev_dbg(dev, "link-local remote is unsupported\n");
1343 return -EINVAL;
1344 }
1345 }
1346
e277de5f
JG		 1347 if (data[IFLA_GENEVE_ID])
1348 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
e305ac6c 1349
8760ce58 1350 if (data[IFLA_GENEVE_TTL])
e305ac6c 1351 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
8760ce58 1352
d8951125 1353 if (data[IFLA_GENEVE_TOS])
e305ac6c 1354 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
d8951125 1355
8eb3b995
DB		 1356 if (data[IFLA_GENEVE_LABEL])
1357 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1358 IPV6_FLOWLABEL_MASK;
1359
e305ac6c 1360 if (data[IFLA_GENEVE_PORT])
7bbe33ff 1361 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
2d07dc79 1362
e305ac6c
PS		 1363 if (data[IFLA_GENEVE_COLLECT_METADATA])
1364 metadata = true;
2d07dc79 1365
abe492b4 1366 if (data[IFLA_GENEVE_UDP_CSUM] &&
14f1f724
AD		 1367 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1368 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
abe492b4
TH		 1369
1370 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1371 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1372 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1373
1374 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1375 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1376 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1377
8eb3b995
DB		 1378 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1379 dst_port, metadata, flags);
2d07dc79
JL		 1380}
1381
1382static void geneve_dellink(struct net_device *dev, struct list_head *head)
1383{
1384 struct geneve_dev *geneve = netdev_priv(dev);
1385
2d07dc79
JL		 1386 list_del(&geneve->next);
1387 unregister_netdevice_queue(dev, head);
1388}
1389
1390static size_t geneve_get_size(const struct net_device *dev)
1391{
1392 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
8ed66f0e 1393 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
8760ce58 1394 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
d8951125 1395 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
8eb3b995 1396 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
7bbe33ff 1397 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
e305ac6c 1398 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
abe492b4
TH		 1399 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1400 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1401 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
2d07dc79
JL		 1402 0;
1403}
1404
1405static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1406{
1407 struct geneve_dev *geneve = netdev_priv(dev);
1408 __u32 vni;
1409
1410 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1411 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1412 goto nla_put_failure;
1413
8ed66f0e
JL		 1414 if (geneve->remote.sa.sa_family == AF_INET) {
1415 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1416 geneve->remote.sin.sin_addr.s_addr))
1417 goto nla_put_failure;
1418#if IS_ENABLED(CONFIG_IPV6)
1419 } else {
1420 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1421 &geneve->remote.sin6.sin6_addr))
1422 goto nla_put_failure;
1423#endif
1424 }
2d07dc79 1425
d8951125 1426 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
8eb3b995
DB		 1427 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1428 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
8760ce58
JL		 1429 goto nla_put_failure;
1430
7bbe33ff 1431 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
cd7918b3
PS		 1432 goto nla_put_failure;
1433
e305ac6c
PS		 1434 if (geneve->collect_md) {
1435 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1436 goto nla_put_failure;
1437 }
1438
abe492b4 1439 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
14f1f724 1440 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
abe492b4
TH		 1441 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1442 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1443 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1444 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1445 goto nla_put_failure;
1446
2d07dc79
JL		 1447 return 0;
1448
1449nla_put_failure:
1450 return -EMSGSIZE;
1451}
1452
1453static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1454 .kind = "geneve",
1455 .maxtype = IFLA_GENEVE_MAX,
1456 .policy = geneve_policy,
1457 .priv_size = sizeof(struct geneve_dev),
1458 .setup = geneve_setup,
1459 .validate = geneve_validate,
1460 .newlink = geneve_newlink,
1461 .dellink = geneve_dellink,
1462 .get_size = geneve_get_size,
1463 .fill_info = geneve_fill_info,
1464};
1465
e305ac6c
PS		 1466struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1467 u8 name_assign_type, u16 dst_port)
1468{
1469 struct nlattr *tb[IFLA_MAX + 1];
1470 struct net_device *dev;
106da663 1471 LIST_HEAD(list_kill);
e305ac6c
PS		 1472 int err;
1473
1474 memset(tb, 0, sizeof(tb));
1475 dev = rtnl_create_link(net, name, name_assign_type,
1476 &geneve_link_ops, tb);
1477 if (IS_ERR(dev))
1478 return dev;
1479
8ed66f0e 1480 err = geneve_configure(net, dev, &geneve_remote_unspec,
8eb3b995 1481 0, 0, 0, 0, htons(dst_port), true,
c868ee70 1482 GENEVE_F_UDP_ZERO_CSUM6_RX);
106da663
ND		 1483 if (err) {
1484 free_netdev(dev);
1485 return ERR_PTR(err);
1486 }
7e059158
DW		 1487
1488 /* openvswitch users expect packet sizes to be unrestricted,
1489 * so set the largest MTU we can.
1490 */
aeee0e66 1491 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
7e059158
DW		 1492 if (err)
1493 goto err;
1494
41009481
ND		 1495 err = rtnl_configure_link(dev, NULL);
1496 if (err < 0)
1497 goto err;
1498
e305ac6c 1499 return dev;
7e059158
DW		 1500
1501 err:
106da663
ND		 1502 geneve_dellink(dev, &list_kill);
1503 unregister_netdevice_many(&list_kill);
7e059158 1504 return ERR_PTR(err);
e305ac6c
PS		 1505}
1506EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1507
681e683f
HFS		 1508static int geneve_netdevice_event(struct notifier_block *unused,
1509 unsigned long event, void *ptr)
1510{
1511 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1512
7c46a640 1513 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
681e683f
HFS		 1514 geneve_push_rx_ports(dev);
1515
1516 return NOTIFY_DONE;
1517}
1518
1519static struct notifier_block geneve_notifier_block __read_mostly = {
1520 .notifier_call = geneve_netdevice_event,
1521};
1522
2d07dc79
JL		 1523static __net_init int geneve_init_net(struct net *net)
1524{
1525 struct geneve_net *gn = net_generic(net, geneve_net_id);
2d07dc79
JL		 1526
1527 INIT_LIST_HEAD(&gn->geneve_list);
371bd106 1528 INIT_LIST_HEAD(&gn->sock_list);
2d07dc79
JL		 1529 return 0;
1530}
1531
1532static void __net_exit geneve_exit_net(struct net *net)
1533{
1534 struct geneve_net *gn = net_generic(net, geneve_net_id);
1535 struct geneve_dev *geneve, *next;
1536 struct net_device *dev, *aux;
1537 LIST_HEAD(list);
1538
1539 rtnl_lock();
1540
1541 /* gather any geneve devices that were moved into this ns */
1542 for_each_netdev_safe(net, dev, aux)
1543 if (dev->rtnl_link_ops == &geneve_link_ops)
1544 unregister_netdevice_queue(dev, &list);
1545
1546 /* now gather any other geneve devices that were created in this ns */
1547 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1548 /* If geneve->dev is in the same netns, it was already added
1549 * to the list by the previous loop.
1550 */
1551 if (!net_eq(dev_net(geneve->dev), net))
1552 unregister_netdevice_queue(geneve->dev, &list);
1553 }
1554
1555 /* unregister the devices gathered above */
1556 unregister_netdevice_many(&list);
1557 rtnl_unlock();
1558}
1559
1560static struct pernet_operations geneve_net_ops = {
1561 .init = geneve_init_net,
1562 .exit = geneve_exit_net,
1563 .id = &geneve_net_id,
1564 .size = sizeof(struct geneve_net),
1565};
1566
1567static int __init geneve_init_module(void)
1568{
1569 int rc;
1570
1571 rc = register_pernet_subsys(&geneve_net_ops);
1572 if (rc)
1573 goto out1;
1574
681e683f 1575 rc = register_netdevice_notifier(&geneve_notifier_block);
2d07dc79
JL		 1576 if (rc)
1577 goto out2;
1578
681e683f
HFS		 1579 rc = rtnl_link_register(&geneve_link_ops);
1580 if (rc)
1581 goto out3;
1582
2d07dc79 1583 return 0;
681e683f
HFS		 1584
1585out3:
1586 unregister_netdevice_notifier(&geneve_notifier_block);
2d07dc79
JL		 1587out2:
1588 unregister_pernet_subsys(&geneve_net_ops);
1589out1:
1590 return rc;
1591}
1592late_initcall(geneve_init_module);
1593
1594static void __exit geneve_cleanup_module(void)
1595{
1596 rtnl_link_unregister(&geneve_link_ops);
681e683f 1597 unregister_netdevice_notifier(&geneve_notifier_block);
2d07dc79
JL		 1598 unregister_pernet_subsys(&geneve_net_ops);
1599}
1600module_exit(geneve_cleanup_module);
1601
1602MODULE_LICENSE("GPL");
1603MODULE_VERSION(GENEVE_NETDEV_VER);
1604MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1605MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1606MODULE_ALIAS_RTNL_LINK("geneve");
Linux 6.x block layer and io_uring tree(s)