blob: 4be2784e7ac2f2422db489e6dd364319b3adab70 [file] [log] [blame]
stephen hemmingerd3428942012-10-01 12:32:35 +00001/*
2 * VXLAN: Virtual eXtensiable 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>
stephen hemmingerd3428942012-10-01 12:32:35 +000031#include <linux/hash.h>
32#include <net/ip.h>
33#include <net/icmp.h>
34#include <net/udp.h>
35#include <net/rtnetlink.h>
36#include <net/route.h>
37#include <net/dsfield.h>
38#include <net/inet_ecn.h>
39#include <net/net_namespace.h>
40#include <net/netns/generic.h>
41
42#define VXLAN_VERSION "0.1"
43
44#define VNI_HASH_BITS 10
45#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
46#define FDB_HASH_BITS 8
47#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
48#define FDB_AGE_DEFAULT 300 /* 5 min */
49#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
50
51#define VXLAN_N_VID (1u << 24)
52#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
53/* VLAN + IP header + UDP + VXLAN */
54#define VXLAN_HEADROOM (4 + 20 + 8 + 8)
55
56#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
57
58/* VXLAN protocol header */
59struct vxlanhdr {
60 __be32 vx_flags;
61 __be32 vx_vni;
62};
63
64/* UDP port for VXLAN traffic. */
65static unsigned int vxlan_port __read_mostly = 8472;
66module_param_named(udp_port, vxlan_port, uint, 0444);
67MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69static bool log_ecn_error = true;
70module_param(log_ecn_error, bool, 0644);
71MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
73/* per-net private data for this module */
74static unsigned int vxlan_net_id;
75struct vxlan_net {
76 struct socket *sock; /* UDP encap socket */
77 struct hlist_head vni_list[VNI_HASH_SIZE];
78};
79
80/* Forwarding table entry */
81struct vxlan_fdb {
82 struct hlist_node hlist; /* linked list of entries */
83 struct rcu_head rcu;
84 unsigned long updated; /* jiffies */
85 unsigned long used;
86 __be32 remote_ip;
87 u16 state; /* see ndm_state */
88 u8 eth_addr[ETH_ALEN];
89};
90
91/* Per-cpu network traffic stats */
92struct vxlan_stats {
93 u64 rx_packets;
94 u64 rx_bytes;
95 u64 tx_packets;
96 u64 tx_bytes;
97 struct u64_stats_sync syncp;
98};
99
100/* Pseudo network device */
101struct vxlan_dev {
102 struct hlist_node hlist;
103 struct net_device *dev;
104 struct vxlan_stats __percpu *stats;
105 __u32 vni; /* virtual network id */
106 __be32 gaddr; /* multicast group */
107 __be32 saddr; /* source address */
108 unsigned int link; /* link to multicast over */
stephen hemminger05f47d62012-10-09 20:35:50 +0000109 __u16 port_min; /* source port range */
110 __u16 port_max;
stephen hemmingerd3428942012-10-01 12:32:35 +0000111 __u8 tos; /* TOS override */
112 __u8 ttl;
113 bool learn;
114
115 unsigned long age_interval;
116 struct timer_list age_timer;
117 spinlock_t hash_lock;
118 unsigned int addrcnt;
119 unsigned int addrmax;
120 unsigned int addrexceeded;
121
122 struct hlist_head fdb_head[FDB_HASH_SIZE];
123};
124
125/* salt for hash table */
126static u32 vxlan_salt __read_mostly;
127
128static inline struct hlist_head *vni_head(struct net *net, u32 id)
129{
130 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
131
132 return &vn->vni_list[hash_32(id, VNI_HASH_BITS)];
133}
134
135/* Look up VNI in a per net namespace table */
136static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id)
137{
138 struct vxlan_dev *vxlan;
139 struct hlist_node *node;
140
141 hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) {
142 if (vxlan->vni == id)
143 return vxlan;
144 }
145
146 return NULL;
147}
148
149/* Fill in neighbour message in skbuff. */
150static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
151 const struct vxlan_fdb *fdb,
152 u32 portid, u32 seq, int type, unsigned int flags)
153{
154 unsigned long now = jiffies;
155 struct nda_cacheinfo ci;
156 struct nlmsghdr *nlh;
157 struct ndmsg *ndm;
158
159 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
160 if (nlh == NULL)
161 return -EMSGSIZE;
162
163 ndm = nlmsg_data(nlh);
164 memset(ndm, 0, sizeof(*ndm));
165 ndm->ndm_family = AF_BRIDGE;
166 ndm->ndm_state = fdb->state;
167 ndm->ndm_ifindex = vxlan->dev->ifindex;
168 ndm->ndm_flags = NTF_SELF;
169 ndm->ndm_type = NDA_DST;
170
171 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
172 goto nla_put_failure;
173
174 if (nla_put_be32(skb, NDA_DST, fdb->remote_ip))
175 goto nla_put_failure;
176
177 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
178 ci.ndm_confirmed = 0;
179 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
180 ci.ndm_refcnt = 0;
181
182 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
183 goto nla_put_failure;
184
185 return nlmsg_end(skb, nlh);
186
187nla_put_failure:
188 nlmsg_cancel(skb, nlh);
189 return -EMSGSIZE;
190}
191
192static inline size_t vxlan_nlmsg_size(void)
193{
194 return NLMSG_ALIGN(sizeof(struct ndmsg))
195 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
196 + nla_total_size(sizeof(__be32)) /* NDA_DST */
197 + nla_total_size(sizeof(struct nda_cacheinfo));
198}
199
200static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
201 const struct vxlan_fdb *fdb, int type)
202{
203 struct net *net = dev_net(vxlan->dev);
204 struct sk_buff *skb;
205 int err = -ENOBUFS;
206
207 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
208 if (skb == NULL)
209 goto errout;
210
211 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0);
212 if (err < 0) {
213 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
214 WARN_ON(err == -EMSGSIZE);
215 kfree_skb(skb);
216 goto errout;
217 }
218
219 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
220 return;
221errout:
222 if (err < 0)
223 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
224}
225
226/* Hash Ethernet address */
227static u32 eth_hash(const unsigned char *addr)
228{
229 u64 value = get_unaligned((u64 *)addr);
230
231 /* only want 6 bytes */
232#ifdef __BIG_ENDIAN
stephen hemmingerd3428942012-10-01 12:32:35 +0000233 value >>= 16;
stephen hemminger321fb992012-10-09 20:35:47 +0000234#else
235 value <<= 16;
stephen hemmingerd3428942012-10-01 12:32:35 +0000236#endif
237 return hash_64(value, FDB_HASH_BITS);
238}
239
240/* Hash chain to use given mac address */
241static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
242 const u8 *mac)
243{
244 return &vxlan->fdb_head[eth_hash(mac)];
245}
246
247/* Look up Ethernet address in forwarding table */
248static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
249 const u8 *mac)
250
251{
252 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
253 struct vxlan_fdb *f;
254 struct hlist_node *node;
255
256 hlist_for_each_entry_rcu(f, node, head, hlist) {
257 if (compare_ether_addr(mac, f->eth_addr) == 0)
258 return f;
259 }
260
261 return NULL;
262}
263
264/* Add new entry to forwarding table -- assumes lock held */
265static int vxlan_fdb_create(struct vxlan_dev *vxlan,
266 const u8 *mac, __be32 ip,
267 __u16 state, __u16 flags)
268{
269 struct vxlan_fdb *f;
270 int notify = 0;
271
272 f = vxlan_find_mac(vxlan, mac);
273 if (f) {
274 if (flags & NLM_F_EXCL) {
275 netdev_dbg(vxlan->dev,
276 "lost race to create %pM\n", mac);
277 return -EEXIST;
278 }
279 if (f->state != state) {
280 f->state = state;
281 f->updated = jiffies;
282 notify = 1;
283 }
284 } else {
285 if (!(flags & NLM_F_CREATE))
286 return -ENOENT;
287
288 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
289 return -ENOSPC;
290
291 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
292 f = kmalloc(sizeof(*f), GFP_ATOMIC);
293 if (!f)
294 return -ENOMEM;
295
296 notify = 1;
297 f->remote_ip = ip;
298 f->state = state;
299 f->updated = f->used = jiffies;
300 memcpy(f->eth_addr, mac, ETH_ALEN);
301
302 ++vxlan->addrcnt;
303 hlist_add_head_rcu(&f->hlist,
304 vxlan_fdb_head(vxlan, mac));
305 }
306
307 if (notify)
308 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
309
310 return 0;
311}
312
313static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
314{
315 netdev_dbg(vxlan->dev,
316 "delete %pM\n", f->eth_addr);
317
318 --vxlan->addrcnt;
319 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
320
321 hlist_del_rcu(&f->hlist);
322 kfree_rcu(f, rcu);
323}
324
325/* Add static entry (via netlink) */
326static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
327 struct net_device *dev,
328 const unsigned char *addr, u16 flags)
329{
330 struct vxlan_dev *vxlan = netdev_priv(dev);
331 __be32 ip;
332 int err;
333
334 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
335 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
336 ndm->ndm_state);
337 return -EINVAL;
338 }
339
340 if (tb[NDA_DST] == NULL)
341 return -EINVAL;
342
343 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
344 return -EAFNOSUPPORT;
345
346 ip = nla_get_be32(tb[NDA_DST]);
347
348 spin_lock_bh(&vxlan->hash_lock);
349 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags);
350 spin_unlock_bh(&vxlan->hash_lock);
351
352 return err;
353}
354
355/* Delete entry (via netlink) */
356static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev,
357 const unsigned char *addr)
358{
359 struct vxlan_dev *vxlan = netdev_priv(dev);
360 struct vxlan_fdb *f;
361 int err = -ENOENT;
362
363 spin_lock_bh(&vxlan->hash_lock);
364 f = vxlan_find_mac(vxlan, addr);
365 if (f) {
366 vxlan_fdb_destroy(vxlan, f);
367 err = 0;
368 }
369 spin_unlock_bh(&vxlan->hash_lock);
370
371 return err;
372}
373
374/* Dump forwarding table */
375static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
376 struct net_device *dev, int idx)
377{
378 struct vxlan_dev *vxlan = netdev_priv(dev);
379 unsigned int h;
380
381 for (h = 0; h < FDB_HASH_SIZE; ++h) {
382 struct vxlan_fdb *f;
383 struct hlist_node *n;
384 int err;
385
386 hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) {
387 if (idx < cb->args[0])
388 goto skip;
389
390 err = vxlan_fdb_info(skb, vxlan, f,
391 NETLINK_CB(cb->skb).portid,
392 cb->nlh->nlmsg_seq,
393 RTM_NEWNEIGH,
394 NLM_F_MULTI);
395 if (err < 0)
396 break;
397skip:
398 ++idx;
399 }
400 }
401
402 return idx;
403}
404
405/* Watch incoming packets to learn mapping between Ethernet address
406 * and Tunnel endpoint.
407 */
408static void vxlan_snoop(struct net_device *dev,
409 __be32 src_ip, const u8 *src_mac)
410{
411 struct vxlan_dev *vxlan = netdev_priv(dev);
412 struct vxlan_fdb *f;
413 int err;
414
415 f = vxlan_find_mac(vxlan, src_mac);
416 if (likely(f)) {
417 f->used = jiffies;
418 if (likely(f->remote_ip == src_ip))
419 return;
420
421 if (net_ratelimit())
422 netdev_info(dev,
423 "%pM migrated from %pI4 to %pI4\n",
424 src_mac, &f->remote_ip, &src_ip);
425
426 f->remote_ip = src_ip;
427 f->updated = jiffies;
428 } else {
429 /* learned new entry */
430 spin_lock(&vxlan->hash_lock);
431 err = vxlan_fdb_create(vxlan, src_mac, src_ip,
432 NUD_REACHABLE,
433 NLM_F_EXCL|NLM_F_CREATE);
434 spin_unlock(&vxlan->hash_lock);
435 }
436}
437
438
439/* See if multicast group is already in use by other ID */
440static bool vxlan_group_used(struct vxlan_net *vn,
441 const struct vxlan_dev *this)
442{
443 const struct vxlan_dev *vxlan;
444 struct hlist_node *node;
445 unsigned h;
446
447 for (h = 0; h < VNI_HASH_SIZE; ++h)
448 hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) {
449 if (vxlan == this)
450 continue;
451
452 if (!netif_running(vxlan->dev))
453 continue;
454
455 if (vxlan->gaddr == this->gaddr)
456 return true;
457 }
458
459 return false;
460}
461
462/* kernel equivalent to IP_ADD_MEMBERSHIP */
463static int vxlan_join_group(struct net_device *dev)
464{
465 struct vxlan_dev *vxlan = netdev_priv(dev);
466 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
467 struct sock *sk = vn->sock->sk;
468 struct ip_mreqn mreq = {
469 .imr_multiaddr.s_addr = vxlan->gaddr,
470 };
471 int err;
472
473 /* Already a member of group */
474 if (vxlan_group_used(vn, vxlan))
475 return 0;
476
477 /* Need to drop RTNL to call multicast join */
478 rtnl_unlock();
479 lock_sock(sk);
480 err = ip_mc_join_group(sk, &mreq);
481 release_sock(sk);
482 rtnl_lock();
483
484 return err;
485}
486
487
488/* kernel equivalent to IP_DROP_MEMBERSHIP */
489static int vxlan_leave_group(struct net_device *dev)
490{
491 struct vxlan_dev *vxlan = netdev_priv(dev);
492 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
493 int err = 0;
494 struct sock *sk = vn->sock->sk;
495 struct ip_mreqn mreq = {
496 .imr_multiaddr.s_addr = vxlan->gaddr,
497 };
498
499 /* Only leave group when last vxlan is done. */
500 if (vxlan_group_used(vn, vxlan))
501 return 0;
502
503 /* Need to drop RTNL to call multicast leave */
504 rtnl_unlock();
505 lock_sock(sk);
506 err = ip_mc_leave_group(sk, &mreq);
507 release_sock(sk);
508 rtnl_lock();
509
510 return err;
511}
512
513/* Callback from net/ipv4/udp.c to receive packets */
514static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
515{
516 struct iphdr *oip;
517 struct vxlanhdr *vxh;
518 struct vxlan_dev *vxlan;
519 struct vxlan_stats *stats;
520 __u32 vni;
521 int err;
522
523 /* pop off outer UDP header */
524 __skb_pull(skb, sizeof(struct udphdr));
525
526 /* Need Vxlan and inner Ethernet header to be present */
527 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
528 goto error;
529
530 /* Drop packets with reserved bits set */
531 vxh = (struct vxlanhdr *) skb->data;
532 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
533 (vxh->vx_vni & htonl(0xff))) {
534 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
535 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
536 goto error;
537 }
538
539 __skb_pull(skb, sizeof(struct vxlanhdr));
540 skb_postpull_rcsum(skb, eth_hdr(skb), sizeof(struct vxlanhdr));
541
542 /* Is this VNI defined? */
543 vni = ntohl(vxh->vx_vni) >> 8;
544 vxlan = vxlan_find_vni(sock_net(sk), vni);
545 if (!vxlan) {
546 netdev_dbg(skb->dev, "unknown vni %d\n", vni);
547 goto drop;
548 }
549
550 if (!pskb_may_pull(skb, ETH_HLEN)) {
551 vxlan->dev->stats.rx_length_errors++;
552 vxlan->dev->stats.rx_errors++;
553 goto drop;
554 }
555
556 /* Re-examine inner Ethernet packet */
557 oip = ip_hdr(skb);
558 skb->protocol = eth_type_trans(skb, vxlan->dev);
559 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
560
561 /* Ignore packet loops (and multicast echo) */
562 if (compare_ether_addr(eth_hdr(skb)->h_source,
563 vxlan->dev->dev_addr) == 0)
564 goto drop;
565
566 if (vxlan->learn)
567 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source);
568
569 __skb_tunnel_rx(skb, vxlan->dev);
570 skb_reset_network_header(skb);
571
572 err = IP_ECN_decapsulate(oip, skb);
573 if (unlikely(err)) {
574 if (log_ecn_error)
575 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
576 &oip->saddr, oip->tos);
577 if (err > 1) {
578 ++vxlan->dev->stats.rx_frame_errors;
579 ++vxlan->dev->stats.rx_errors;
580 goto drop;
581 }
582 }
583
584 stats = this_cpu_ptr(vxlan->stats);
585 u64_stats_update_begin(&stats->syncp);
586 stats->rx_packets++;
587 stats->rx_bytes += skb->len;
588 u64_stats_update_end(&stats->syncp);
589
590 netif_rx(skb);
591
592 return 0;
593error:
594 /* Put UDP header back */
595 __skb_push(skb, sizeof(struct udphdr));
596
597 return 1;
598drop:
599 /* Consume bad packet */
600 kfree_skb(skb);
601 return 0;
602}
603
604/* Extract dsfield from inner protocol */
605static inline u8 vxlan_get_dsfield(const struct iphdr *iph,
606 const struct sk_buff *skb)
607{
608 if (skb->protocol == htons(ETH_P_IP))
609 return iph->tos;
610 else if (skb->protocol == htons(ETH_P_IPV6))
611 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
612 else
613 return 0;
614}
615
616/* Propogate ECN bits out */
617static inline u8 vxlan_ecn_encap(u8 tos,
618 const struct iphdr *iph,
619 const struct sk_buff *skb)
620{
621 u8 inner = vxlan_get_dsfield(iph, skb);
622
623 return INET_ECN_encapsulate(tos, inner);
624}
625
stephen hemmingeref59feb2012-10-09 20:35:46 +0000626static __be32 vxlan_find_dst(struct vxlan_dev *vxlan, struct sk_buff *skb)
627{
628 const struct ethhdr *eth = (struct ethhdr *) skb->data;
629 const struct vxlan_fdb *f;
630
631 if (is_multicast_ether_addr(eth->h_dest))
632 return vxlan->gaddr;
633
634 f = vxlan_find_mac(vxlan, eth->h_dest);
635 if (f)
636 return f->remote_ip;
637 else
638 return vxlan->gaddr;
639
640}
641
stephen hemminger1cad8712012-10-09 20:35:49 +0000642static void vxlan_sock_free(struct sk_buff *skb)
643{
644 sock_put(skb->sk);
645}
646
647/* On transmit, associate with the tunnel socket */
648static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
649{
650 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
651 struct sock *sk = vn->sock->sk;
652
653 skb_orphan(skb);
654 sock_hold(sk);
655 skb->sk = sk;
656 skb->destructor = vxlan_sock_free;
657}
658
stephen hemminger05f47d62012-10-09 20:35:50 +0000659/* Compute source port for outgoing packet
660 * first choice to use L4 flow hash since it will spread
661 * better and maybe available from hardware
662 * secondary choice is to use jhash on the Ethernet header
663 */
664static u16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
665{
666 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
667 u32 hash;
668
669 hash = skb_get_rxhash(skb);
670 if (!hash)
671 hash = jhash(skb->data, 2 * ETH_ALEN,
672 (__force u32) skb->protocol);
673
674 return (((u64) hash * range) >> 32) + vxlan->port_min;
675}
676
stephen hemmingerd3428942012-10-01 12:32:35 +0000677/* Transmit local packets over Vxlan
678 *
679 * Outer IP header inherits ECN and DF from inner header.
680 * Outer UDP destination is the VXLAN assigned port.
stephen hemminger05f47d62012-10-09 20:35:50 +0000681 * source port is based on hash of flow
stephen hemmingerd3428942012-10-01 12:32:35 +0000682 */
683static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
684{
685 struct vxlan_dev *vxlan = netdev_priv(dev);
686 struct rtable *rt;
stephen hemmingerd3428942012-10-01 12:32:35 +0000687 const struct iphdr *old_iph;
688 struct iphdr *iph;
689 struct vxlanhdr *vxh;
690 struct udphdr *uh;
691 struct flowi4 fl4;
stephen hemmingerd3428942012-10-01 12:32:35 +0000692 unsigned int pkt_len = skb->len;
stephen hemmingerd3428942012-10-01 12:32:35 +0000693 __be32 dst;
stephen hemminger05f47d62012-10-09 20:35:50 +0000694 __u16 src_port;
stephen hemmingerd3428942012-10-01 12:32:35 +0000695 __be16 df = 0;
696 __u8 tos, ttl;
697 int err;
698
stephen hemmingeref59feb2012-10-09 20:35:46 +0000699 dst = vxlan_find_dst(vxlan, skb);
700 if (!dst)
701 goto drop;
702
stephen hemmingerd3428942012-10-01 12:32:35 +0000703 /* Need space for new headers (invalidates iph ptr) */
704 if (skb_cow_head(skb, VXLAN_HEADROOM))
705 goto drop;
706
stephen hemmingerd3428942012-10-01 12:32:35 +0000707 old_iph = ip_hdr(skb);
708
stephen hemmingerd3428942012-10-01 12:32:35 +0000709 ttl = vxlan->ttl;
710 if (!ttl && IN_MULTICAST(ntohl(dst)))
711 ttl = 1;
712
713 tos = vxlan->tos;
714 if (tos == 1)
715 tos = vxlan_get_dsfield(old_iph, skb);
716
stephen hemminger05f47d62012-10-09 20:35:50 +0000717 src_port = vxlan_src_port(vxlan, skb);
stephen hemmingerd3428942012-10-01 12:32:35 +0000718
stephen hemmingerca78f182012-10-09 20:35:48 +0000719 memset(&fl4, 0, sizeof(fl4));
720 fl4.flowi4_oif = vxlan->link;
721 fl4.flowi4_tos = RT_TOS(tos);
722 fl4.daddr = dst;
723 fl4.saddr = vxlan->saddr;
724
725 rt = ip_route_output_key(dev_net(dev), &fl4);
stephen hemmingerd3428942012-10-01 12:32:35 +0000726 if (IS_ERR(rt)) {
727 netdev_dbg(dev, "no route to %pI4\n", &dst);
728 dev->stats.tx_carrier_errors++;
729 goto tx_error;
730 }
731
732 if (rt->dst.dev == dev) {
733 netdev_dbg(dev, "circular route to %pI4\n", &dst);
734 ip_rt_put(rt);
735 dev->stats.collisions++;
736 goto tx_error;
737 }
738
739 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
740 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
741 IPSKB_REROUTED);
742 skb_dst_drop(skb);
743 skb_dst_set(skb, &rt->dst);
744
745 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
746 vxh->vx_flags = htonl(VXLAN_FLAGS);
747 vxh->vx_vni = htonl(vxlan->vni << 8);
748
749 __skb_push(skb, sizeof(*uh));
750 skb_reset_transport_header(skb);
751 uh = udp_hdr(skb);
752
753 uh->dest = htons(vxlan_port);
stephen hemminger05f47d62012-10-09 20:35:50 +0000754 uh->source = htons(src_port);
stephen hemmingerd3428942012-10-01 12:32:35 +0000755
756 uh->len = htons(skb->len);
757 uh->check = 0;
758
759 __skb_push(skb, sizeof(*iph));
760 skb_reset_network_header(skb);
761 iph = ip_hdr(skb);
762 iph->version = 4;
763 iph->ihl = sizeof(struct iphdr) >> 2;
764 iph->frag_off = df;
765 iph->protocol = IPPROTO_UDP;
766 iph->tos = vxlan_ecn_encap(tos, old_iph, skb);
stephen hemmingerca78f182012-10-09 20:35:48 +0000767 iph->daddr = dst;
stephen hemmingerd3428942012-10-01 12:32:35 +0000768 iph->saddr = fl4.saddr;
769 iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
770
stephen hemminger1cad8712012-10-09 20:35:49 +0000771 vxlan_set_owner(dev, skb);
772
stephen hemmingerd3428942012-10-01 12:32:35 +0000773 /* See __IPTUNNEL_XMIT */
774 skb->ip_summed = CHECKSUM_NONE;
775 ip_select_ident(iph, &rt->dst, NULL);
776
777 err = ip_local_out(skb);
778 if (likely(net_xmit_eval(err) == 0)) {
779 struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats);
780
781 u64_stats_update_begin(&stats->syncp);
782 stats->tx_packets++;
783 stats->tx_bytes += pkt_len;
784 u64_stats_update_end(&stats->syncp);
785 } else {
786 dev->stats.tx_errors++;
787 dev->stats.tx_aborted_errors++;
788 }
789 return NETDEV_TX_OK;
790
791drop:
792 dev->stats.tx_dropped++;
793 goto tx_free;
794
795tx_error:
796 dev->stats.tx_errors++;
797tx_free:
798 dev_kfree_skb(skb);
799 return NETDEV_TX_OK;
800}
801
802/* Walk the forwarding table and purge stale entries */
803static void vxlan_cleanup(unsigned long arg)
804{
805 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
806 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
807 unsigned int h;
808
809 if (!netif_running(vxlan->dev))
810 return;
811
812 spin_lock_bh(&vxlan->hash_lock);
813 for (h = 0; h < FDB_HASH_SIZE; ++h) {
814 struct hlist_node *p, *n;
815 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
816 struct vxlan_fdb *f
817 = container_of(p, struct vxlan_fdb, hlist);
818 unsigned long timeout;
819
820 if (f->state == NUD_PERMANENT)
821 continue;
822
823 timeout = f->used + vxlan->age_interval * HZ;
824 if (time_before_eq(timeout, jiffies)) {
825 netdev_dbg(vxlan->dev,
826 "garbage collect %pM\n",
827 f->eth_addr);
828 f->state = NUD_STALE;
829 vxlan_fdb_destroy(vxlan, f);
830 } else if (time_before(timeout, next_timer))
831 next_timer = timeout;
832 }
833 }
834 spin_unlock_bh(&vxlan->hash_lock);
835
836 mod_timer(&vxlan->age_timer, next_timer);
837}
838
839/* Setup stats when device is created */
840static int vxlan_init(struct net_device *dev)
841{
842 struct vxlan_dev *vxlan = netdev_priv(dev);
843
844 vxlan->stats = alloc_percpu(struct vxlan_stats);
845 if (!vxlan->stats)
846 return -ENOMEM;
847
848 return 0;
849}
850
851/* Start ageing timer and join group when device is brought up */
852static int vxlan_open(struct net_device *dev)
853{
854 struct vxlan_dev *vxlan = netdev_priv(dev);
855 int err;
856
857 if (vxlan->gaddr) {
858 err = vxlan_join_group(dev);
859 if (err)
860 return err;
861 }
862
863 if (vxlan->age_interval)
864 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
865
866 return 0;
867}
868
869/* Purge the forwarding table */
870static void vxlan_flush(struct vxlan_dev *vxlan)
871{
872 unsigned h;
873
874 spin_lock_bh(&vxlan->hash_lock);
875 for (h = 0; h < FDB_HASH_SIZE; ++h) {
876 struct hlist_node *p, *n;
877 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
878 struct vxlan_fdb *f
879 = container_of(p, struct vxlan_fdb, hlist);
880 vxlan_fdb_destroy(vxlan, f);
881 }
882 }
883 spin_unlock_bh(&vxlan->hash_lock);
884}
885
886/* Cleanup timer and forwarding table on shutdown */
887static int vxlan_stop(struct net_device *dev)
888{
889 struct vxlan_dev *vxlan = netdev_priv(dev);
890
891 if (vxlan->gaddr)
892 vxlan_leave_group(dev);
893
894 del_timer_sync(&vxlan->age_timer);
895
896 vxlan_flush(vxlan);
897
898 return 0;
899}
900
901/* Merge per-cpu statistics */
902static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev,
903 struct rtnl_link_stats64 *stats)
904{
905 struct vxlan_dev *vxlan = netdev_priv(dev);
906 struct vxlan_stats tmp, sum = { 0 };
907 unsigned int cpu;
908
909 for_each_possible_cpu(cpu) {
910 unsigned int start;
911 const struct vxlan_stats *stats
912 = per_cpu_ptr(vxlan->stats, cpu);
913
914 do {
915 start = u64_stats_fetch_begin_bh(&stats->syncp);
916 memcpy(&tmp, stats, sizeof(tmp));
917 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
918
919 sum.tx_bytes += tmp.tx_bytes;
920 sum.tx_packets += tmp.tx_packets;
921 sum.rx_bytes += tmp.rx_bytes;
922 sum.rx_packets += tmp.rx_packets;
923 }
924
925 stats->tx_bytes = sum.tx_bytes;
926 stats->tx_packets = sum.tx_packets;
927 stats->rx_bytes = sum.rx_bytes;
928 stats->rx_packets = sum.rx_packets;
929
930 stats->multicast = dev->stats.multicast;
931 stats->rx_length_errors = dev->stats.rx_length_errors;
932 stats->rx_frame_errors = dev->stats.rx_frame_errors;
933 stats->rx_errors = dev->stats.rx_errors;
934
935 stats->tx_dropped = dev->stats.tx_dropped;
936 stats->tx_carrier_errors = dev->stats.tx_carrier_errors;
937 stats->tx_aborted_errors = dev->stats.tx_aborted_errors;
938 stats->collisions = dev->stats.collisions;
939 stats->tx_errors = dev->stats.tx_errors;
940
941 return stats;
942}
943
944/* Stub, nothing needs to be done. */
945static void vxlan_set_multicast_list(struct net_device *dev)
946{
947}
948
949static const struct net_device_ops vxlan_netdev_ops = {
950 .ndo_init = vxlan_init,
951 .ndo_open = vxlan_open,
952 .ndo_stop = vxlan_stop,
953 .ndo_start_xmit = vxlan_xmit,
954 .ndo_get_stats64 = vxlan_stats64,
955 .ndo_set_rx_mode = vxlan_set_multicast_list,
956 .ndo_change_mtu = eth_change_mtu,
957 .ndo_validate_addr = eth_validate_addr,
958 .ndo_set_mac_address = eth_mac_addr,
959 .ndo_fdb_add = vxlan_fdb_add,
960 .ndo_fdb_del = vxlan_fdb_delete,
961 .ndo_fdb_dump = vxlan_fdb_dump,
962};
963
964/* Info for udev, that this is a virtual tunnel endpoint */
965static struct device_type vxlan_type = {
966 .name = "vxlan",
967};
968
969static void vxlan_free(struct net_device *dev)
970{
971 struct vxlan_dev *vxlan = netdev_priv(dev);
972
973 free_percpu(vxlan->stats);
974 free_netdev(dev);
975}
976
977/* Initialize the device structure. */
978static void vxlan_setup(struct net_device *dev)
979{
980 struct vxlan_dev *vxlan = netdev_priv(dev);
981 unsigned h;
stephen hemminger05f47d62012-10-09 20:35:50 +0000982 int low, high;
stephen hemmingerd3428942012-10-01 12:32:35 +0000983
984 eth_hw_addr_random(dev);
985 ether_setup(dev);
986
987 dev->netdev_ops = &vxlan_netdev_ops;
988 dev->destructor = vxlan_free;
989 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
990
991 dev->tx_queue_len = 0;
992 dev->features |= NETIF_F_LLTX;
993 dev->features |= NETIF_F_NETNS_LOCAL;
994 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
995
996 spin_lock_init(&vxlan->hash_lock);
997
998 init_timer_deferrable(&vxlan->age_timer);
999 vxlan->age_timer.function = vxlan_cleanup;
1000 vxlan->age_timer.data = (unsigned long) vxlan;
1001
stephen hemminger05f47d62012-10-09 20:35:50 +00001002 inet_get_local_port_range(&low, &high);
1003 vxlan->port_min = low;
1004 vxlan->port_max = high;
1005
stephen hemmingerd3428942012-10-01 12:32:35 +00001006 vxlan->dev = dev;
1007
1008 for (h = 0; h < FDB_HASH_SIZE; ++h)
1009 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1010}
1011
1012static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1013 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
1014 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1015 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1016 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1017 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1018 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1019 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1020 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1021 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
stephen hemminger05f47d62012-10-09 20:35:50 +00001022 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
stephen hemmingerd3428942012-10-01 12:32:35 +00001023};
1024
1025static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1026{
1027 if (tb[IFLA_ADDRESS]) {
1028 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1029 pr_debug("invalid link address (not ethernet)\n");
1030 return -EINVAL;
1031 }
1032
1033 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1034 pr_debug("invalid all zero ethernet address\n");
1035 return -EADDRNOTAVAIL;
1036 }
1037 }
1038
1039 if (!data)
1040 return -EINVAL;
1041
1042 if (data[IFLA_VXLAN_ID]) {
1043 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1044 if (id >= VXLAN_VID_MASK)
1045 return -ERANGE;
1046 }
1047
1048 if (data[IFLA_VXLAN_GROUP]) {
1049 __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1050 if (!IN_MULTICAST(ntohl(gaddr))) {
1051 pr_debug("group address is not IPv4 multicast\n");
1052 return -EADDRNOTAVAIL;
1053 }
1054 }
stephen hemminger05f47d62012-10-09 20:35:50 +00001055
1056 if (data[IFLA_VXLAN_PORT_RANGE]) {
1057 const struct ifla_vxlan_port_range *p
1058 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1059
1060 if (ntohs(p->high) < ntohs(p->low)) {
1061 pr_debug("port range %u .. %u not valid\n",
1062 ntohs(p->low), ntohs(p->high));
1063 return -EINVAL;
1064 }
1065 }
1066
stephen hemmingerd3428942012-10-01 12:32:35 +00001067 return 0;
1068}
1069
1070static int vxlan_newlink(struct net *net, struct net_device *dev,
1071 struct nlattr *tb[], struct nlattr *data[])
1072{
1073 struct vxlan_dev *vxlan = netdev_priv(dev);
1074 __u32 vni;
1075 int err;
1076
1077 if (!data[IFLA_VXLAN_ID])
1078 return -EINVAL;
1079
1080 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
1081 if (vxlan_find_vni(net, vni)) {
1082 pr_info("duplicate VNI %u\n", vni);
1083 return -EEXIST;
1084 }
1085 vxlan->vni = vni;
1086
1087 if (data[IFLA_VXLAN_GROUP])
1088 vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1089
1090 if (data[IFLA_VXLAN_LOCAL])
1091 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1092
1093 if (data[IFLA_VXLAN_LINK]) {
1094 vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]);
1095
1096 if (!tb[IFLA_MTU]) {
1097 struct net_device *lowerdev;
1098 lowerdev = __dev_get_by_index(net, vxlan->link);
1099 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1100 }
1101 }
1102
1103 if (data[IFLA_VXLAN_TOS])
1104 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1105
1106 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
1107 vxlan->learn = true;
1108
1109 if (data[IFLA_VXLAN_AGEING])
1110 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1111 else
1112 vxlan->age_interval = FDB_AGE_DEFAULT;
1113
1114 if (data[IFLA_VXLAN_LIMIT])
1115 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1116
stephen hemminger05f47d62012-10-09 20:35:50 +00001117 if (data[IFLA_VXLAN_PORT_RANGE]) {
1118 const struct ifla_vxlan_port_range *p
1119 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1120 vxlan->port_min = ntohs(p->low);
1121 vxlan->port_max = ntohs(p->high);
1122 }
1123
stephen hemmingerd3428942012-10-01 12:32:35 +00001124 err = register_netdevice(dev);
1125 if (!err)
1126 hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni));
1127
1128 return err;
1129}
1130
1131static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1132{
1133 struct vxlan_dev *vxlan = netdev_priv(dev);
1134
1135 hlist_del_rcu(&vxlan->hlist);
1136
1137 unregister_netdevice_queue(dev, head);
1138}
1139
1140static size_t vxlan_get_size(const struct net_device *dev)
1141{
1142
1143 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
1144 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
1145 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1146 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1147 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1148 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1149 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
1150 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1151 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
stephen hemminger05f47d62012-10-09 20:35:50 +00001152 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
stephen hemmingerd3428942012-10-01 12:32:35 +00001153 0;
1154}
1155
1156static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1157{
1158 const struct vxlan_dev *vxlan = netdev_priv(dev);
stephen hemminger05f47d62012-10-09 20:35:50 +00001159 struct ifla_vxlan_port_range ports = {
1160 .low = htons(vxlan->port_min),
1161 .high = htons(vxlan->port_max),
1162 };
stephen hemmingerd3428942012-10-01 12:32:35 +00001163
1164 if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni))
1165 goto nla_put_failure;
1166
Stephen Hemminger7c41c422012-10-08 14:55:30 -07001167 if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr))
stephen hemmingerd3428942012-10-01 12:32:35 +00001168 goto nla_put_failure;
1169
1170 if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link))
1171 goto nla_put_failure;
1172
Stephen Hemminger7c41c422012-10-08 14:55:30 -07001173 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
stephen hemmingerd3428942012-10-01 12:32:35 +00001174 goto nla_put_failure;
1175
1176 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1177 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
1178 nla_put_u8(skb, IFLA_VXLAN_LEARNING, vxlan->learn) ||
1179 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
1180 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax))
1181 goto nla_put_failure;
1182
stephen hemminger05f47d62012-10-09 20:35:50 +00001183 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1184 goto nla_put_failure;
1185
stephen hemmingerd3428942012-10-01 12:32:35 +00001186 return 0;
1187
1188nla_put_failure:
1189 return -EMSGSIZE;
1190}
1191
1192static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1193 .kind = "vxlan",
1194 .maxtype = IFLA_VXLAN_MAX,
1195 .policy = vxlan_policy,
1196 .priv_size = sizeof(struct vxlan_dev),
1197 .setup = vxlan_setup,
1198 .validate = vxlan_validate,
1199 .newlink = vxlan_newlink,
1200 .dellink = vxlan_dellink,
1201 .get_size = vxlan_get_size,
1202 .fill_info = vxlan_fill_info,
1203};
1204
1205static __net_init int vxlan_init_net(struct net *net)
1206{
1207 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1208 struct sock *sk;
1209 struct sockaddr_in vxlan_addr = {
1210 .sin_family = AF_INET,
1211 .sin_addr.s_addr = htonl(INADDR_ANY),
1212 };
1213 int rc;
1214 unsigned h;
1215
1216 /* Create UDP socket for encapsulation receive. */
1217 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
1218 if (rc < 0) {
1219 pr_debug("UDP socket create failed\n");
1220 return rc;
1221 }
stephen hemmingerbfe1b9b2012-10-01 18:49:21 +00001222 /* Put in proper namespace */
1223 sk = vn->sock->sk;
1224 sk_change_net(sk, net);
stephen hemmingerd3428942012-10-01 12:32:35 +00001225
1226 vxlan_addr.sin_port = htons(vxlan_port);
1227
1228 rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr,
1229 sizeof(vxlan_addr));
1230 if (rc < 0) {
1231 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1232 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
stephen hemmingerbfe1b9b2012-10-01 18:49:21 +00001233 sk_release_kernel(sk);
stephen hemmingerd3428942012-10-01 12:32:35 +00001234 vn->sock = NULL;
1235 return rc;
1236 }
1237
1238 /* Disable multicast loopback */
stephen hemmingerd3428942012-10-01 12:32:35 +00001239 inet_sk(sk)->mc_loop = 0;
1240
1241 /* Mark socket as an encapsulation socket. */
1242 udp_sk(sk)->encap_type = 1;
1243 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1244 udp_encap_enable();
1245
1246 for (h = 0; h < VNI_HASH_SIZE; ++h)
1247 INIT_HLIST_HEAD(&vn->vni_list[h]);
1248
1249 return 0;
1250}
1251
1252static __net_exit void vxlan_exit_net(struct net *net)
1253{
1254 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1255
1256 if (vn->sock) {
stephen hemmingerbfe1b9b2012-10-01 18:49:21 +00001257 sk_release_kernel(vn->sock->sk);
stephen hemmingerd3428942012-10-01 12:32:35 +00001258 vn->sock = NULL;
1259 }
1260}
1261
1262static struct pernet_operations vxlan_net_ops = {
1263 .init = vxlan_init_net,
1264 .exit = vxlan_exit_net,
1265 .id = &vxlan_net_id,
1266 .size = sizeof(struct vxlan_net),
1267};
1268
1269static int __init vxlan_init_module(void)
1270{
1271 int rc;
1272
1273 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1274
1275 rc = register_pernet_device(&vxlan_net_ops);
1276 if (rc)
1277 goto out1;
1278
1279 rc = rtnl_link_register(&vxlan_link_ops);
1280 if (rc)
1281 goto out2;
1282
1283 return 0;
1284
1285out2:
1286 unregister_pernet_device(&vxlan_net_ops);
1287out1:
1288 return rc;
1289}
1290module_init(vxlan_init_module);
1291
1292static void __exit vxlan_cleanup_module(void)
1293{
1294 rtnl_link_unregister(&vxlan_link_ops);
1295 unregister_pernet_device(&vxlan_net_ops);
1296}
1297module_exit(vxlan_cleanup_module);
1298
1299MODULE_LICENSE("GPL");
1300MODULE_VERSION(VXLAN_VERSION);
1301MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>");
1302MODULE_ALIAS_RTNL_LINK("vxlan");