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thermal: Convert to devm_ioremap_resource()
[linux-2.6.git] / drivers / net / vxlan.c
blob656230e0d18c7bb1f79892910c56a341f856d862
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012 Vyatta 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 * TODO
11 * - use IANA UDP port number (when defined)
12 * - IPv6 (not in RFC)
13 */
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/rculist.h>
24 #include <linux/netdevice.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/udp.h>
28 #include <linux/igmp.h>
29 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/hash.h>
32 #include <net/arp.h>
33 #include <net/ndisc.h>
34 #include <net/ip.h>
35 #include <net/icmp.h>
36 #include <net/udp.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43
44 #define VXLAN_VERSION "0.1"
45
46 #define VNI_HASH_BITS 10
47 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
48 #define FDB_HASH_BITS 8
49 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
50 #define FDB_AGE_DEFAULT 300 /* 5 min */
51 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
52
53 #define VXLAN_N_VID (1u << 24)
54 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
55 /* IP header + UDP + VXLAN + Ethernet header */
56 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
57
58 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
59
60 /* VXLAN protocol header */
61 struct vxlanhdr {
62 __be32 vx_flags;
63 __be32 vx_vni;
64 };
65
66 /* UDP port for VXLAN traffic. */
67 static unsigned int vxlan_port __read_mostly = 8472;
68 module_param_named(udp_port, vxlan_port, uint, 0444);
69 MODULE_PARM_DESC(udp_port, "Destination UDP port");
70
71 static bool log_ecn_error = true;
72 module_param(log_ecn_error, bool, 0644);
73 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
74
75 /* per-net private data for this module */
76 static unsigned int vxlan_net_id;
77 struct vxlan_net {
78 struct socket *sock; /* UDP encap socket */
79 struct hlist_head vni_list[VNI_HASH_SIZE];
80 };
81
82 /* Forwarding table entry */
83 struct vxlan_fdb {
84 struct hlist_node hlist; /* linked list of entries */
85 struct rcu_head rcu;
86 unsigned long updated; /* jiffies */
87 unsigned long used;
88 __be32 remote_ip;
89 u16 state; /* see ndm_state */
90 u8 eth_addr[ETH_ALEN];
91 };
92
93 /* Per-cpu network traffic stats */
94 struct vxlan_stats {
95 u64 rx_packets;
96 u64 rx_bytes;
97 u64 tx_packets;
98 u64 tx_bytes;
99 struct u64_stats_sync syncp;
100 };
101
102 /* Pseudo network device */
103 struct vxlan_dev {
104 struct hlist_node hlist;
105 struct net_device *dev;
106 struct vxlan_stats __percpu *stats;
107 __u32 vni; /* virtual network id */
108 __be32 gaddr; /* multicast group */
109 __be32 saddr; /* source address */
110 unsigned int link; /* link to multicast over */
111 __u16 port_min; /* source port range */
112 __u16 port_max;
113 __u8 tos; /* TOS override */
114 __u8 ttl;
115 u32 flags; /* VXLAN_F_* below */
116
117 unsigned long age_interval;
118 struct timer_list age_timer;
119 spinlock_t hash_lock;
120 unsigned int addrcnt;
121 unsigned int addrmax;
122
123 struct hlist_head fdb_head[FDB_HASH_SIZE];
124 };
125
126 #define VXLAN_F_LEARN 0x01
127 #define VXLAN_F_PROXY 0x02
128 #define VXLAN_F_RSC 0x04
129 #define VXLAN_F_L2MISS 0x08
130 #define VXLAN_F_L3MISS 0x10
131
132 /* salt for hash table */
133 static u32 vxlan_salt __read_mostly;
134
135 static inline struct hlist_head *vni_head(struct net *net, u32 id)
136 {
137 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
138
139 return &vn->vni_list[hash_32(id, VNI_HASH_BITS)];
140 }
141
142 /* Look up VNI in a per net namespace table */
143 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id)
144 {
145 struct vxlan_dev *vxlan;
146 struct hlist_node *node;
147
148 hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) {
149 if (vxlan->vni == id)
150 return vxlan;
151 }
152
153 return NULL;
154 }
155
156 /* Fill in neighbour message in skbuff. */
157 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
158 const struct vxlan_fdb *fdb,
159 u32 portid, u32 seq, int type, unsigned int flags)
160 {
161 unsigned long now = jiffies;
162 struct nda_cacheinfo ci;
163 struct nlmsghdr *nlh;
164 struct ndmsg *ndm;
165 bool send_ip, send_eth;
166
167 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
168 if (nlh == NULL)
169 return -EMSGSIZE;
170
171 ndm = nlmsg_data(nlh);
172 memset(ndm, 0, sizeof(*ndm));
173
174 send_eth = send_ip = true;
175
176 if (type == RTM_GETNEIGH) {
177 ndm->ndm_family = AF_INET;
178 send_ip = fdb->remote_ip != 0;
179 send_eth = !is_zero_ether_addr(fdb->eth_addr);
180 } else
181 ndm->ndm_family = AF_BRIDGE;
182 ndm->ndm_state = fdb->state;
183 ndm->ndm_ifindex = vxlan->dev->ifindex;
184 ndm->ndm_flags = NTF_SELF;
185 ndm->ndm_type = NDA_DST;
186
187 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
188 goto nla_put_failure;
189
190 if (send_ip && nla_put_be32(skb, NDA_DST, fdb->remote_ip))
191 goto nla_put_failure;
192
193 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
194 ci.ndm_confirmed = 0;
195 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
196 ci.ndm_refcnt = 0;
197
198 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
199 goto nla_put_failure;
200
201 return nlmsg_end(skb, nlh);
202
203 nla_put_failure:
204 nlmsg_cancel(skb, nlh);
205 return -EMSGSIZE;
206 }
207
208 static inline size_t vxlan_nlmsg_size(void)
209 {
210 return NLMSG_ALIGN(sizeof(struct ndmsg))
211 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
212 + nla_total_size(sizeof(__be32)) /* NDA_DST */
213 + nla_total_size(sizeof(struct nda_cacheinfo));
214 }
215
216 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
217 const struct vxlan_fdb *fdb, int type)
218 {
219 struct net *net = dev_net(vxlan->dev);
220 struct sk_buff *skb;
221 int err = -ENOBUFS;
222
223 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
224 if (skb == NULL)
225 goto errout;
226
227 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0);
228 if (err < 0) {
229 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
230 WARN_ON(err == -EMSGSIZE);
231 kfree_skb(skb);
232 goto errout;
233 }
234
235 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
236 return;
237 errout:
238 if (err < 0)
239 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
240 }
241
242 static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
243 {
244 struct vxlan_dev *vxlan = netdev_priv(dev);
245 struct vxlan_fdb f;
246
247 memset(&f, 0, sizeof f);
248 f.state = NUD_STALE;
249 f.remote_ip = ipa; /* goes to NDA_DST */
250
251 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
252 }
253
254 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
255 {
256 struct vxlan_fdb f;
257
258 memset(&f, 0, sizeof f);
259 f.state = NUD_STALE;
260 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
261
262 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
263 }
264
265 /* Hash Ethernet address */
266 static u32 eth_hash(const unsigned char *addr)
267 {
268 u64 value = get_unaligned((u64 *)addr);
269
270 /* only want 6 bytes */
271 #ifdef __BIG_ENDIAN
272 value >>= 16;
273 #else
274 value <<= 16;
275 #endif
276 return hash_64(value, FDB_HASH_BITS);
277 }
278
279 /* Hash chain to use given mac address */
280 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
281 const u8 *mac)
282 {
283 return &vxlan->fdb_head[eth_hash(mac)];
284 }
285
286 /* Look up Ethernet address in forwarding table */
287 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
288 const u8 *mac)
289
290 {
291 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
292 struct vxlan_fdb *f;
293 struct hlist_node *node;
294
295 hlist_for_each_entry_rcu(f, node, head, hlist) {
296 if (compare_ether_addr(mac, f->eth_addr) == 0)
297 return f;
298 }
299
300 return NULL;
301 }
302
303 /* Add new entry to forwarding table -- assumes lock held */
304 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
305 const u8 *mac, __be32 ip,
306 __u16 state, __u16 flags)
307 {
308 struct vxlan_fdb *f;
309 int notify = 0;
310
311 f = vxlan_find_mac(vxlan, mac);
312 if (f) {
313 if (flags & NLM_F_EXCL) {
314 netdev_dbg(vxlan->dev,
315 "lost race to create %pM\n", mac);
316 return -EEXIST;
317 }
318 if (f->state != state) {
319 f->state = state;
320 f->updated = jiffies;
321 notify = 1;
322 }
323 } else {
324 if (!(flags & NLM_F_CREATE))
325 return -ENOENT;
326
327 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
328 return -ENOSPC;
329
330 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
331 f = kmalloc(sizeof(*f), GFP_ATOMIC);
332 if (!f)
333 return -ENOMEM;
334
335 notify = 1;
336 f->remote_ip = ip;
337 f->state = state;
338 f->updated = f->used = jiffies;
339 memcpy(f->eth_addr, mac, ETH_ALEN);
340
341 ++vxlan->addrcnt;
342 hlist_add_head_rcu(&f->hlist,
343 vxlan_fdb_head(vxlan, mac));
344 }
345
346 if (notify)
347 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
348
349 return 0;
350 }
351
352 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
353 {
354 netdev_dbg(vxlan->dev,
355 "delete %pM\n", f->eth_addr);
356
357 --vxlan->addrcnt;
358 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
359
360 hlist_del_rcu(&f->hlist);
361 kfree_rcu(f, rcu);
362 }
363
364 /* Add static entry (via netlink) */
365 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
366 struct net_device *dev,
367 const unsigned char *addr, u16 flags)
368 {
369 struct vxlan_dev *vxlan = netdev_priv(dev);
370 __be32 ip;
371 int err;
372
373 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
374 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
375 ndm->ndm_state);
376 return -EINVAL;
377 }
378
379 if (tb[NDA_DST] == NULL)
380 return -EINVAL;
381
382 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
383 return -EAFNOSUPPORT;
384
385 ip = nla_get_be32(tb[NDA_DST]);
386
387 spin_lock_bh(&vxlan->hash_lock);
388 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags);
389 spin_unlock_bh(&vxlan->hash_lock);
390
391 return err;
392 }
393
394 /* Delete entry (via netlink) */
395 static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev,
396 const unsigned char *addr)
397 {
398 struct vxlan_dev *vxlan = netdev_priv(dev);
399 struct vxlan_fdb *f;
400 int err = -ENOENT;
401
402 spin_lock_bh(&vxlan->hash_lock);
403 f = vxlan_find_mac(vxlan, addr);
404 if (f) {
405 vxlan_fdb_destroy(vxlan, f);
406 err = 0;
407 }
408 spin_unlock_bh(&vxlan->hash_lock);
409
410 return err;
411 }
412
413 /* Dump forwarding table */
414 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
415 struct net_device *dev, int idx)
416 {
417 struct vxlan_dev *vxlan = netdev_priv(dev);
418 unsigned int h;
419
420 for (h = 0; h < FDB_HASH_SIZE; ++h) {
421 struct vxlan_fdb *f;
422 struct hlist_node *n;
423 int err;
424
425 hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) {
426 if (idx < cb->args[0])
427 goto skip;
428
429 err = vxlan_fdb_info(skb, vxlan, f,
430 NETLINK_CB(cb->skb).portid,
431 cb->nlh->nlmsg_seq,
432 RTM_NEWNEIGH,
433 NLM_F_MULTI);
434 if (err < 0)
435 break;
436 skip:
437 ++idx;
438 }
439 }
440
441 return idx;
442 }
443
444 /* Watch incoming packets to learn mapping between Ethernet address
445 * and Tunnel endpoint.
446 */
447 static void vxlan_snoop(struct net_device *dev,
448 __be32 src_ip, const u8 *src_mac)
449 {
450 struct vxlan_dev *vxlan = netdev_priv(dev);
451 struct vxlan_fdb *f;
452 int err;
453
454 f = vxlan_find_mac(vxlan, src_mac);
455 if (likely(f)) {
456 f->used = jiffies;
457 if (likely(f->remote_ip == src_ip))
458 return;
459
460 if (net_ratelimit())
461 netdev_info(dev,
462 "%pM migrated from %pI4 to %pI4\n",
463 src_mac, &f->remote_ip, &src_ip);
464
465 f->remote_ip = src_ip;
466 f->updated = jiffies;
467 } else {
468 /* learned new entry */
469 spin_lock(&vxlan->hash_lock);
470 err = vxlan_fdb_create(vxlan, src_mac, src_ip,
471 NUD_REACHABLE,
472 NLM_F_EXCL|NLM_F_CREATE);
473 spin_unlock(&vxlan->hash_lock);
474 }
475 }
476
477
478 /* See if multicast group is already in use by other ID */
479 static bool vxlan_group_used(struct vxlan_net *vn,
480 const struct vxlan_dev *this)
481 {
482 const struct vxlan_dev *vxlan;
483 struct hlist_node *node;
484 unsigned h;
485
486 for (h = 0; h < VNI_HASH_SIZE; ++h)
487 hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) {
488 if (vxlan == this)
489 continue;
490
491 if (!netif_running(vxlan->dev))
492 continue;
493
494 if (vxlan->gaddr == this->gaddr)
495 return true;
496 }
497
498 return false;
499 }
500
501 /* kernel equivalent to IP_ADD_MEMBERSHIP */
502 static int vxlan_join_group(struct net_device *dev)
503 {
504 struct vxlan_dev *vxlan = netdev_priv(dev);
505 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
506 struct sock *sk = vn->sock->sk;
507 struct ip_mreqn mreq = {
508 .imr_multiaddr.s_addr = vxlan->gaddr,
509 .imr_ifindex = vxlan->link,
510 };
511 int err;
512
513 /* Already a member of group */
514 if (vxlan_group_used(vn, vxlan))
515 return 0;
516
517 /* Need to drop RTNL to call multicast join */
518 rtnl_unlock();
519 lock_sock(sk);
520 err = ip_mc_join_group(sk, &mreq);
521 release_sock(sk);
522 rtnl_lock();
523
524 return err;
525 }
526
527
528 /* kernel equivalent to IP_DROP_MEMBERSHIP */
529 static int vxlan_leave_group(struct net_device *dev)
530 {
531 struct vxlan_dev *vxlan = netdev_priv(dev);
532 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
533 int err = 0;
534 struct sock *sk = vn->sock->sk;
535 struct ip_mreqn mreq = {
536 .imr_multiaddr.s_addr = vxlan->gaddr,
537 .imr_ifindex = vxlan->link,
538 };
539
540 /* Only leave group when last vxlan is done. */
541 if (vxlan_group_used(vn, vxlan))
542 return 0;
543
544 /* Need to drop RTNL to call multicast leave */
545 rtnl_unlock();
546 lock_sock(sk);
547 err = ip_mc_leave_group(sk, &mreq);
548 release_sock(sk);
549 rtnl_lock();
550
551 return err;
552 }
553
554 /* Callback from net/ipv4/udp.c to receive packets */
555 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
556 {
557 struct iphdr *oip;
558 struct vxlanhdr *vxh;
559 struct vxlan_dev *vxlan;
560 struct vxlan_stats *stats;
561 __u32 vni;
562 int err;
563
564 /* pop off outer UDP header */
565 __skb_pull(skb, sizeof(struct udphdr));
566
567 /* Need Vxlan and inner Ethernet header to be present */
568 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
569 goto error;
570
571 /* Drop packets with reserved bits set */
572 vxh = (struct vxlanhdr *) skb->data;
573 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
574 (vxh->vx_vni & htonl(0xff))) {
575 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
576 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
577 goto error;
578 }
579
580 __skb_pull(skb, sizeof(struct vxlanhdr));
581
582 /* Is this VNI defined? */
583 vni = ntohl(vxh->vx_vni) >> 8;
584 vxlan = vxlan_find_vni(sock_net(sk), vni);
585 if (!vxlan) {
586 netdev_dbg(skb->dev, "unknown vni %d\n", vni);
587 goto drop;
588 }
589
590 if (!pskb_may_pull(skb, ETH_HLEN)) {
591 vxlan->dev->stats.rx_length_errors++;
592 vxlan->dev->stats.rx_errors++;
593 goto drop;
594 }
595
596 skb_reset_mac_header(skb);
597
598 /* Re-examine inner Ethernet packet */
599 oip = ip_hdr(skb);
600 skb->protocol = eth_type_trans(skb, vxlan->dev);
601
602 /* Ignore packet loops (and multicast echo) */
603 if (compare_ether_addr(eth_hdr(skb)->h_source,
604 vxlan->dev->dev_addr) == 0)
605 goto drop;
606
607 if (vxlan->flags & VXLAN_F_LEARN)
608 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source);
609
610 __skb_tunnel_rx(skb, vxlan->dev);
611 skb_reset_network_header(skb);
612
613 /* If the NIC driver gave us an encapsulated packet with
614 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
615 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
616 * for us. Otherwise force the upper layers to verify it.
617 */
618 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
619 !(vxlan->dev->features & NETIF_F_RXCSUM))
620 skb->ip_summed = CHECKSUM_NONE;
621
622 skb->encapsulation = 0;
623
624 err = IP_ECN_decapsulate(oip, skb);
625 if (unlikely(err)) {
626 if (log_ecn_error)
627 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
628 &oip->saddr, oip->tos);
629 if (err > 1) {
630 ++vxlan->dev->stats.rx_frame_errors;
631 ++vxlan->dev->stats.rx_errors;
632 goto drop;
633 }
634 }
635
636 stats = this_cpu_ptr(vxlan->stats);
637 u64_stats_update_begin(&stats->syncp);
638 stats->rx_packets++;
639 stats->rx_bytes += skb->len;
640 u64_stats_update_end(&stats->syncp);
641
642 netif_rx(skb);
643
644 return 0;
645 error:
646 /* Put UDP header back */
647 __skb_push(skb, sizeof(struct udphdr));
648
649 return 1;
650 drop:
651 /* Consume bad packet */
652 kfree_skb(skb);
653 return 0;
654 }
655
656 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
657 {
658 struct vxlan_dev *vxlan = netdev_priv(dev);
659 struct arphdr *parp;
660 u8 *arpptr, *sha;
661 __be32 sip, tip;
662 struct neighbour *n;
663
664 if (dev->flags & IFF_NOARP)
665 goto out;
666
667 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
668 dev->stats.tx_dropped++;
669 goto out;
670 }
671 parp = arp_hdr(skb);
672
673 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
674 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
675 parp->ar_pro != htons(ETH_P_IP) ||
676 parp->ar_op != htons(ARPOP_REQUEST) ||
677 parp->ar_hln != dev->addr_len ||
678 parp->ar_pln != 4)
679 goto out;
680 arpptr = (u8 *)parp + sizeof(struct arphdr);
681 sha = arpptr;
682 arpptr += dev->addr_len; /* sha */
683 memcpy(&sip, arpptr, sizeof(sip));
684 arpptr += sizeof(sip);
685 arpptr += dev->addr_len; /* tha */
686 memcpy(&tip, arpptr, sizeof(tip));
687
688 if (ipv4_is_loopback(tip) ||
689 ipv4_is_multicast(tip))
690 goto out;
691
692 n = neigh_lookup(&arp_tbl, &tip, dev);
693
694 if (n) {
695 struct vxlan_dev *vxlan = netdev_priv(dev);
696 struct vxlan_fdb *f;
697 struct sk_buff *reply;
698
699 if (!(n->nud_state & NUD_CONNECTED)) {
700 neigh_release(n);
701 goto out;
702 }
703
704 f = vxlan_find_mac(vxlan, n->ha);
705 if (f && f->remote_ip == 0) {
706 /* bridge-local neighbor */
707 neigh_release(n);
708 goto out;
709 }
710
711 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
712 n->ha, sha);
713
714 neigh_release(n);
715
716 skb_reset_mac_header(reply);
717 __skb_pull(reply, skb_network_offset(reply));
718 reply->ip_summed = CHECKSUM_UNNECESSARY;
719 reply->pkt_type = PACKET_HOST;
720
721 if (netif_rx_ni(reply) == NET_RX_DROP)
722 dev->stats.rx_dropped++;
723 } else if (vxlan->flags & VXLAN_F_L3MISS)
724 vxlan_ip_miss(dev, tip);
725 out:
726 consume_skb(skb);
727 return NETDEV_TX_OK;
728 }
729
730 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
731 {
732 struct vxlan_dev *vxlan = netdev_priv(dev);
733 struct neighbour *n;
734 struct iphdr *pip;
735
736 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
737 return false;
738
739 n = NULL;
740 switch (ntohs(eth_hdr(skb)->h_proto)) {
741 case ETH_P_IP:
742 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
743 return false;
744 pip = ip_hdr(skb);
745 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
746 break;
747 default:
748 return false;
749 }
750
751 if (n) {
752 bool diff;
753
754 diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
755 if (diff) {
756 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
757 dev->addr_len);
758 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
759 }
760 neigh_release(n);
761 return diff;
762 } else if (vxlan->flags & VXLAN_F_L3MISS)
763 vxlan_ip_miss(dev, pip->daddr);
764 return false;
765 }
766
767 /* Extract dsfield from inner protocol */
768 static inline u8 vxlan_get_dsfield(const struct iphdr *iph,
769 const struct sk_buff *skb)
770 {
771 if (skb->protocol == htons(ETH_P_IP))
772 return iph->tos;
773 else if (skb->protocol == htons(ETH_P_IPV6))
774 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
775 else
776 return 0;
777 }
778
779 /* Propogate ECN bits out */
780 static inline u8 vxlan_ecn_encap(u8 tos,
781 const struct iphdr *iph,
782 const struct sk_buff *skb)
783 {
784 u8 inner = vxlan_get_dsfield(iph, skb);
785
786 return INET_ECN_encapsulate(tos, inner);
787 }
788
789 static void vxlan_sock_free(struct sk_buff *skb)
790 {
791 sock_put(skb->sk);
792 }
793
794 /* On transmit, associate with the tunnel socket */
795 static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
796 {
797 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
798 struct sock *sk = vn->sock->sk;
799
800 skb_orphan(skb);
801 sock_hold(sk);
802 skb->sk = sk;
803 skb->destructor = vxlan_sock_free;
804 }
805
806 /* Compute source port for outgoing packet
807 * first choice to use L4 flow hash since it will spread
808 * better and maybe available from hardware
809 * secondary choice is to use jhash on the Ethernet header
810 */
811 static u16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
812 {
813 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
814 u32 hash;
815
816 hash = skb_get_rxhash(skb);
817 if (!hash)
818 hash = jhash(skb->data, 2 * ETH_ALEN,
819 (__force u32) skb->protocol);
820
821 return (((u64) hash * range) >> 32) + vxlan->port_min;
822 }
823
824 /* Transmit local packets over Vxlan
825 *
826 * Outer IP header inherits ECN and DF from inner header.
827 * Outer UDP destination is the VXLAN assigned port.
828 * source port is based on hash of flow
829 */
830 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
831 {
832 struct vxlan_dev *vxlan = netdev_priv(dev);
833 struct rtable *rt;
834 const struct iphdr *old_iph;
835 struct ethhdr *eth;
836 struct iphdr *iph;
837 struct vxlanhdr *vxh;
838 struct udphdr *uh;
839 struct flowi4 fl4;
840 unsigned int pkt_len = skb->len;
841 __be32 dst;
842 __u16 src_port;
843 __be16 df = 0;
844 __u8 tos, ttl;
845 int err;
846 bool did_rsc = false;
847 const struct vxlan_fdb *f;
848
849 skb_reset_mac_header(skb);
850 eth = eth_hdr(skb);
851
852 if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
853 return arp_reduce(dev, skb);
854 else if ((vxlan->flags&VXLAN_F_RSC) && ntohs(eth->h_proto) == ETH_P_IP)
855 did_rsc = route_shortcircuit(dev, skb);
856
857 f = vxlan_find_mac(vxlan, eth->h_dest);
858 if (f == NULL) {
859 did_rsc = false;
860 dst = vxlan->gaddr;
861 if (!dst && (vxlan->flags & VXLAN_F_L2MISS) &&
862 !is_multicast_ether_addr(eth->h_dest))
863 vxlan_fdb_miss(vxlan, eth->h_dest);
864 } else
865 dst = f->remote_ip;
866
867 if (!dst) {
868 if (did_rsc) {
869 __skb_pull(skb, skb_network_offset(skb));
870 skb->ip_summed = CHECKSUM_NONE;
871 skb->pkt_type = PACKET_HOST;
872
873 /* short-circuited back to local bridge */
874 if (netif_rx(skb) == NET_RX_SUCCESS) {
875 struct vxlan_stats *stats =
876 this_cpu_ptr(vxlan->stats);
877
878 u64_stats_update_begin(&stats->syncp);
879 stats->tx_packets++;
880 stats->tx_bytes += pkt_len;
881 u64_stats_update_end(&stats->syncp);
882 } else {
883 dev->stats.tx_errors++;
884 dev->stats.tx_aborted_errors++;
885 }
886 return NETDEV_TX_OK;
887 }
888 goto drop;
889 }
890
891 if (!skb->encapsulation) {
892 skb_reset_inner_headers(skb);
893 skb->encapsulation = 1;
894 }
895
896 /* Need space for new headers (invalidates iph ptr) */
897 if (skb_cow_head(skb, VXLAN_HEADROOM))
898 goto drop;
899
900 old_iph = ip_hdr(skb);
901
902 ttl = vxlan->ttl;
903 if (!ttl && IN_MULTICAST(ntohl(dst)))
904 ttl = 1;
905
906 tos = vxlan->tos;
907 if (tos == 1)
908 tos = vxlan_get_dsfield(old_iph, skb);
909
910 src_port = vxlan_src_port(vxlan, skb);
911
912 memset(&fl4, 0, sizeof(fl4));
913 fl4.flowi4_oif = vxlan->link;
914 fl4.flowi4_tos = RT_TOS(tos);
915 fl4.daddr = dst;
916 fl4.saddr = vxlan->saddr;
917
918 rt = ip_route_output_key(dev_net(dev), &fl4);
919 if (IS_ERR(rt)) {
920 netdev_dbg(dev, "no route to %pI4\n", &dst);
921 dev->stats.tx_carrier_errors++;
922 goto tx_error;
923 }
924
925 if (rt->dst.dev == dev) {
926 netdev_dbg(dev, "circular route to %pI4\n", &dst);
927 ip_rt_put(rt);
928 dev->stats.collisions++;
929 goto tx_error;
930 }
931
932 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
933 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
934 IPSKB_REROUTED);
935 skb_dst_drop(skb);
936 skb_dst_set(skb, &rt->dst);
937
938 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
939 vxh->vx_flags = htonl(VXLAN_FLAGS);
940 vxh->vx_vni = htonl(vxlan->vni << 8);
941
942 __skb_push(skb, sizeof(*uh));
943 skb_reset_transport_header(skb);
944 uh = udp_hdr(skb);
945
946 uh->dest = htons(vxlan_port);
947 uh->source = htons(src_port);
948
949 uh->len = htons(skb->len);
950 uh->check = 0;
951
952 __skb_push(skb, sizeof(*iph));
953 skb_reset_network_header(skb);
954 iph = ip_hdr(skb);
955 iph->version = 4;
956 iph->ihl = sizeof(struct iphdr) >> 2;
957 iph->frag_off = df;
958 iph->protocol = IPPROTO_UDP;
959 iph->tos = vxlan_ecn_encap(tos, old_iph, skb);
960 iph->daddr = dst;
961 iph->saddr = fl4.saddr;
962 iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
963
964 vxlan_set_owner(dev, skb);
965
966 /* See iptunnel_xmit() */
967 if (skb->ip_summed != CHECKSUM_PARTIAL)
968 skb->ip_summed = CHECKSUM_NONE;
969 ip_select_ident(iph, &rt->dst, NULL);
970
971 err = ip_local_out(skb);
972 if (likely(net_xmit_eval(err) == 0)) {
973 struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats);
974
975 u64_stats_update_begin(&stats->syncp);
976 stats->tx_packets++;
977 stats->tx_bytes += pkt_len;
978 u64_stats_update_end(&stats->syncp);
979 } else {
980 dev->stats.tx_errors++;
981 dev->stats.tx_aborted_errors++;
982 }
983 return NETDEV_TX_OK;
984
985 drop:
986 dev->stats.tx_dropped++;
987 goto tx_free;
988
989 tx_error:
990 dev->stats.tx_errors++;
991 tx_free:
992 dev_kfree_skb(skb);
993 return NETDEV_TX_OK;
994 }
995
996 /* Walk the forwarding table and purge stale entries */
997 static void vxlan_cleanup(unsigned long arg)
998 {
999 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1000 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1001 unsigned int h;
1002
1003 if (!netif_running(vxlan->dev))
1004 return;
1005
1006 spin_lock_bh(&vxlan->hash_lock);
1007 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1008 struct hlist_node *p, *n;
1009 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1010 struct vxlan_fdb *f
1011 = container_of(p, struct vxlan_fdb, hlist);
1012 unsigned long timeout;
1013
1014 if (f->state & NUD_PERMANENT)
1015 continue;
1016
1017 timeout = f->used + vxlan->age_interval * HZ;
1018 if (time_before_eq(timeout, jiffies)) {
1019 netdev_dbg(vxlan->dev,
1020 "garbage collect %pM\n",
1021 f->eth_addr);
1022 f->state = NUD_STALE;
1023 vxlan_fdb_destroy(vxlan, f);
1024 } else if (time_before(timeout, next_timer))
1025 next_timer = timeout;
1026 }
1027 }
1028 spin_unlock_bh(&vxlan->hash_lock);
1029
1030 mod_timer(&vxlan->age_timer, next_timer);
1031 }
1032
1033 /* Setup stats when device is created */
1034 static int vxlan_init(struct net_device *dev)
1035 {
1036 struct vxlan_dev *vxlan = netdev_priv(dev);
1037
1038 vxlan->stats = alloc_percpu(struct vxlan_stats);
1039 if (!vxlan->stats)
1040 return -ENOMEM;
1041
1042 return 0;
1043 }
1044
1045 /* Start ageing timer and join group when device is brought up */
1046 static int vxlan_open(struct net_device *dev)
1047 {
1048 struct vxlan_dev *vxlan = netdev_priv(dev);
1049 int err;
1050
1051 if (vxlan->gaddr) {
1052 err = vxlan_join_group(dev);
1053 if (err)
1054 return err;
1055 }
1056
1057 if (vxlan->age_interval)
1058 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1059
1060 return 0;
1061 }
1062
1063 /* Purge the forwarding table */
1064 static void vxlan_flush(struct vxlan_dev *vxlan)
1065 {
1066 unsigned h;
1067
1068 spin_lock_bh(&vxlan->hash_lock);
1069 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1070 struct hlist_node *p, *n;
1071 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1072 struct vxlan_fdb *f
1073 = container_of(p, struct vxlan_fdb, hlist);
1074 vxlan_fdb_destroy(vxlan, f);
1075 }
1076 }
1077 spin_unlock_bh(&vxlan->hash_lock);
1078 }
1079
1080 /* Cleanup timer and forwarding table on shutdown */
1081 static int vxlan_stop(struct net_device *dev)
1082 {
1083 struct vxlan_dev *vxlan = netdev_priv(dev);
1084
1085 if (vxlan->gaddr)
1086 vxlan_leave_group(dev);
1087
1088 del_timer_sync(&vxlan->age_timer);
1089
1090 vxlan_flush(vxlan);
1091
1092 return 0;
1093 }
1094
1095 /* Merge per-cpu statistics */
1096 static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev,
1097 struct rtnl_link_stats64 *stats)
1098 {
1099 struct vxlan_dev *vxlan = netdev_priv(dev);
1100 struct vxlan_stats tmp, sum = { 0 };
1101 unsigned int cpu;
1102
1103 for_each_possible_cpu(cpu) {
1104 unsigned int start;
1105 const struct vxlan_stats *stats
1106 = per_cpu_ptr(vxlan->stats, cpu);
1107
1108 do {
1109 start = u64_stats_fetch_begin_bh(&stats->syncp);
1110 memcpy(&tmp, stats, sizeof(tmp));
1111 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
1112
1113 sum.tx_bytes += tmp.tx_bytes;
1114 sum.tx_packets += tmp.tx_packets;
1115 sum.rx_bytes += tmp.rx_bytes;
1116 sum.rx_packets += tmp.rx_packets;
1117 }
1118
1119 stats->tx_bytes = sum.tx_bytes;
1120 stats->tx_packets = sum.tx_packets;
1121 stats->rx_bytes = sum.rx_bytes;
1122 stats->rx_packets = sum.rx_packets;
1123
1124 stats->multicast = dev->stats.multicast;
1125 stats->rx_length_errors = dev->stats.rx_length_errors;
1126 stats->rx_frame_errors = dev->stats.rx_frame_errors;
1127 stats->rx_errors = dev->stats.rx_errors;
1128
1129 stats->tx_dropped = dev->stats.tx_dropped;
1130 stats->tx_carrier_errors = dev->stats.tx_carrier_errors;
1131 stats->tx_aborted_errors = dev->stats.tx_aborted_errors;
1132 stats->collisions = dev->stats.collisions;
1133 stats->tx_errors = dev->stats.tx_errors;
1134
1135 return stats;
1136 }
1137
1138 /* Stub, nothing needs to be done. */
1139 static void vxlan_set_multicast_list(struct net_device *dev)
1140 {
1141 }
1142
1143 static const struct net_device_ops vxlan_netdev_ops = {
1144 .ndo_init = vxlan_init,
1145 .ndo_open = vxlan_open,
1146 .ndo_stop = vxlan_stop,
1147 .ndo_start_xmit = vxlan_xmit,
1148 .ndo_get_stats64 = vxlan_stats64,
1149 .ndo_set_rx_mode = vxlan_set_multicast_list,
1150 .ndo_change_mtu = eth_change_mtu,
1151 .ndo_validate_addr = eth_validate_addr,
1152 .ndo_set_mac_address = eth_mac_addr,
1153 .ndo_fdb_add = vxlan_fdb_add,
1154 .ndo_fdb_del = vxlan_fdb_delete,
1155 .ndo_fdb_dump = vxlan_fdb_dump,
1156 };
1157
1158 /* Info for udev, that this is a virtual tunnel endpoint */
1159 static struct device_type vxlan_type = {
1160 .name = "vxlan",
1161 };
1162
1163 static void vxlan_free(struct net_device *dev)
1164 {
1165 struct vxlan_dev *vxlan = netdev_priv(dev);
1166
1167 free_percpu(vxlan->stats);
1168 free_netdev(dev);
1169 }
1170
1171 /* Initialize the device structure. */
1172 static void vxlan_setup(struct net_device *dev)
1173 {
1174 struct vxlan_dev *vxlan = netdev_priv(dev);
1175 unsigned h;
1176 int low, high;
1177
1178 eth_hw_addr_random(dev);
1179 ether_setup(dev);
1180 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
1181
1182 dev->netdev_ops = &vxlan_netdev_ops;
1183 dev->destructor = vxlan_free;
1184 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1185
1186 dev->tx_queue_len = 0;
1187 dev->features |= NETIF_F_LLTX;
1188 dev->features |= NETIF_F_NETNS_LOCAL;
1189 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1190 dev->features |= NETIF_F_RXCSUM;
1191
1192 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1193 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1194 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1195
1196 spin_lock_init(&vxlan->hash_lock);
1197
1198 init_timer_deferrable(&vxlan->age_timer);
1199 vxlan->age_timer.function = vxlan_cleanup;
1200 vxlan->age_timer.data = (unsigned long) vxlan;
1201
1202 inet_get_local_port_range(&low, &high);
1203 vxlan->port_min = low;
1204 vxlan->port_max = high;
1205
1206 vxlan->dev = dev;
1207
1208 for (h = 0; h < FDB_HASH_SIZE; ++h)
1209 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1210 }
1211
1212 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1213 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
1214 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1215 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1216 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1217 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1218 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1219 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1220 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1221 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
1222 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
1223 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
1224 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
1225 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
1226 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
1227 };
1228
1229 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1230 {
1231 if (tb[IFLA_ADDRESS]) {
1232 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1233 pr_debug("invalid link address (not ethernet)\n");
1234 return -EINVAL;
1235 }
1236
1237 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1238 pr_debug("invalid all zero ethernet address\n");
1239 return -EADDRNOTAVAIL;
1240 }
1241 }
1242
1243 if (!data)
1244 return -EINVAL;
1245
1246 if (data[IFLA_VXLAN_ID]) {
1247 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1248 if (id >= VXLAN_VID_MASK)
1249 return -ERANGE;
1250 }
1251
1252 if (data[IFLA_VXLAN_GROUP]) {
1253 __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1254 if (!IN_MULTICAST(ntohl(gaddr))) {
1255 pr_debug("group address is not IPv4 multicast\n");
1256 return -EADDRNOTAVAIL;
1257 }
1258 }
1259
1260 if (data[IFLA_VXLAN_PORT_RANGE]) {
1261 const struct ifla_vxlan_port_range *p
1262 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1263
1264 if (ntohs(p->high) < ntohs(p->low)) {
1265 pr_debug("port range %u .. %u not valid\n",
1266 ntohs(p->low), ntohs(p->high));
1267 return -EINVAL;
1268 }
1269 }
1270
1271 return 0;
1272 }
1273
1274 static int vxlan_newlink(struct net *net, struct net_device *dev,
1275 struct nlattr *tb[], struct nlattr *data[])
1276 {
1277 struct vxlan_dev *vxlan = netdev_priv(dev);
1278 __u32 vni;
1279 int err;
1280
1281 if (!data[IFLA_VXLAN_ID])
1282 return -EINVAL;
1283
1284 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
1285 if (vxlan_find_vni(net, vni)) {
1286 pr_info("duplicate VNI %u\n", vni);
1287 return -EEXIST;
1288 }
1289 vxlan->vni = vni;
1290
1291 if (data[IFLA_VXLAN_GROUP])
1292 vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1293
1294 if (data[IFLA_VXLAN_LOCAL])
1295 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1296
1297 if (data[IFLA_VXLAN_LINK] &&
1298 (vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
1299 struct net_device *lowerdev
1300 = __dev_get_by_index(net, vxlan->link);
1301
1302 if (!lowerdev) {
1303 pr_info("ifindex %d does not exist\n", vxlan->link);
1304 return -ENODEV;
1305 }
1306
1307 if (!tb[IFLA_MTU])
1308 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1309
1310 /* update header length based on lower device */
1311 dev->hard_header_len = lowerdev->hard_header_len +
1312 VXLAN_HEADROOM;
1313 }
1314
1315 if (data[IFLA_VXLAN_TOS])
1316 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1317
1318 if (data[IFLA_VXLAN_TTL])
1319 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1320
1321 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
1322 vxlan->flags |= VXLAN_F_LEARN;
1323
1324 if (data[IFLA_VXLAN_AGEING])
1325 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1326 else
1327 vxlan->age_interval = FDB_AGE_DEFAULT;
1328
1329 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1330 vxlan->flags |= VXLAN_F_PROXY;
1331
1332 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1333 vxlan->flags |= VXLAN_F_RSC;
1334
1335 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1336 vxlan->flags |= VXLAN_F_L2MISS;
1337
1338 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1339 vxlan->flags |= VXLAN_F_L3MISS;
1340
1341 if (data[IFLA_VXLAN_LIMIT])
1342 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1343
1344 if (data[IFLA_VXLAN_PORT_RANGE]) {
1345 const struct ifla_vxlan_port_range *p
1346 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1347 vxlan->port_min = ntohs(p->low);
1348 vxlan->port_max = ntohs(p->high);
1349 }
1350
1351 err = register_netdevice(dev);
1352 if (!err)
1353 hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni));
1354
1355 return err;
1356 }
1357
1358 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1359 {
1360 struct vxlan_dev *vxlan = netdev_priv(dev);
1361
1362 hlist_del_rcu(&vxlan->hlist);
1363
1364 unregister_netdevice_queue(dev, head);
1365 }
1366
1367 static size_t vxlan_get_size(const struct net_device *dev)
1368 {
1369
1370 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
1371 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
1372 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1373 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1374 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1375 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1376 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
1377 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
1378 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
1379 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
1380 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
1381 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1382 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
1383 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
1384 0;
1385 }
1386
1387 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1388 {
1389 const struct vxlan_dev *vxlan = netdev_priv(dev);
1390 struct ifla_vxlan_port_range ports = {
1391 .low = htons(vxlan->port_min),
1392 .high = htons(vxlan->port_max),
1393 };
1394
1395 if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni))
1396 goto nla_put_failure;
1397
1398 if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr))
1399 goto nla_put_failure;
1400
1401 if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link))
1402 goto nla_put_failure;
1403
1404 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
1405 goto nla_put_failure;
1406
1407 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1408 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
1409 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1410 !!(vxlan->flags & VXLAN_F_LEARN)) ||
1411 nla_put_u8(skb, IFLA_VXLAN_PROXY,
1412 !!(vxlan->flags & VXLAN_F_PROXY)) ||
1413 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1414 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1415 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1416 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1417 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
1418 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
1419 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax))
1420 goto nla_put_failure;
1421
1422 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1423 goto nla_put_failure;
1424
1425 return 0;
1426
1427 nla_put_failure:
1428 return -EMSGSIZE;
1429 }
1430
1431 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1432 .kind = "vxlan",
1433 .maxtype = IFLA_VXLAN_MAX,
1434 .policy = vxlan_policy,
1435 .priv_size = sizeof(struct vxlan_dev),
1436 .setup = vxlan_setup,
1437 .validate = vxlan_validate,
1438 .newlink = vxlan_newlink,
1439 .dellink = vxlan_dellink,
1440 .get_size = vxlan_get_size,
1441 .fill_info = vxlan_fill_info,
1442 };
1443
1444 static __net_init int vxlan_init_net(struct net *net)
1445 {
1446 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1447 struct sock *sk;
1448 struct sockaddr_in vxlan_addr = {
1449 .sin_family = AF_INET,
1450 .sin_addr.s_addr = htonl(INADDR_ANY),
1451 };
1452 int rc;
1453 unsigned h;
1454
1455 /* Create UDP socket for encapsulation receive. */
1456 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
1457 if (rc < 0) {
1458 pr_debug("UDP socket create failed\n");
1459 return rc;
1460 }
1461 /* Put in proper namespace */
1462 sk = vn->sock->sk;
1463 sk_change_net(sk, net);
1464
1465 vxlan_addr.sin_port = htons(vxlan_port);
1466
1467 rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr,
1468 sizeof(vxlan_addr));
1469 if (rc < 0) {
1470 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1471 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1472 sk_release_kernel(sk);
1473 vn->sock = NULL;
1474 return rc;
1475 }
1476
1477 /* Disable multicast loopback */
1478 inet_sk(sk)->mc_loop = 0;
1479
1480 /* Mark socket as an encapsulation socket. */
1481 udp_sk(sk)->encap_type = 1;
1482 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1483 udp_encap_enable();
1484
1485 for (h = 0; h < VNI_HASH_SIZE; ++h)
1486 INIT_HLIST_HEAD(&vn->vni_list[h]);
1487
1488 return 0;
1489 }
1490
1491 static __net_exit void vxlan_exit_net(struct net *net)
1492 {
1493 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1494
1495 if (vn->sock) {
1496 sk_release_kernel(vn->sock->sk);
1497 vn->sock = NULL;
1498 }
1499 }
1500
1501 static struct pernet_operations vxlan_net_ops = {
1502 .init = vxlan_init_net,
1503 .exit = vxlan_exit_net,
1504 .id = &vxlan_net_id,
1505 .size = sizeof(struct vxlan_net),
1506 };
1507
1508 static int __init vxlan_init_module(void)
1509 {
1510 int rc;
1511
1512 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1513
1514 rc = register_pernet_device(&vxlan_net_ops);
1515 if (rc)
1516 goto out1;
1517
1518 rc = rtnl_link_register(&vxlan_link_ops);
1519 if (rc)
1520 goto out2;
1521
1522 return 0;
1523
1524 out2:
1525 unregister_pernet_device(&vxlan_net_ops);
1526 out1:
1527 return rc;
1528 }
1529 module_init(vxlan_init_module);
1530
1531 static void __exit vxlan_cleanup_module(void)
1532 {
1533 rtnl_link_unregister(&vxlan_link_ops);
1534 unregister_pernet_device(&vxlan_net_ops);
1535 }
1536 module_exit(vxlan_cleanup_module);
1537
1538 MODULE_LICENSE("GPL");
1539 MODULE_VERSION(VXLAN_VERSION);
1540 MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>");
1541 MODULE_ALIAS_RTNL_LINK("vxlan");
Linus' kernel tree