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stephen hemmingerd3428942012-10-01 12:32:35 +00001/*
Rami Roseneb5ce432012-11-13 13:29:15 +00002 * VXLAN: Virtual eXtensible Local Area Network
stephen hemmingerd3428942012-10-01 12:32:35 +00003 *
stephen hemminger3b8df3c2013-04-27 11:31:52 +00004 * Copyright (c) 2012-2013 Vyatta Inc.
stephen hemmingerd3428942012-10-01 12:32:35 +00005 *
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
stephen hemmingerd3428942012-10-01 12:32:35 +000011 * - IPv6 (not in RFC)
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/module.h>
19#include <linux/errno.h>
20#include <linux/slab.h>
21#include <linux/skbuff.h>
22#include <linux/rculist.h>
23#include <linux/netdevice.h>
24#include <linux/in.h>
25#include <linux/ip.h>
26#include <linux/udp.h>
27#include <linux/igmp.h>
28#include <linux/etherdevice.h>
29#include <linux/if_ether.h>
stephen hemmingerd3428942012-10-01 12:32:35 +000030#include <linux/hash.h>
Yan Burman1b13c972013-01-29 23:43:07 +000031#include <linux/ethtool.h>
David Stevense4f67ad2012-11-20 02:50:14 +000032#include <net/arp.h>
33#include <net/ndisc.h>
stephen hemmingerd3428942012-10-01 12:32:35 +000034#include <net/ip.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000035#include <net/ip_tunnels.h>
stephen hemmingerd3428942012-10-01 12:32:35 +000036#include <net/icmp.h>
37#include <net/udp.h>
38#include <net/rtnetlink.h>
39#include <net/route.h>
40#include <net/dsfield.h>
41#include <net/inet_ecn.h>
42#include <net/net_namespace.h>
43#include <net/netns/generic.h>
44
45#define VXLAN_VERSION "0.1"
46
stephen hemminger553675f2013-05-16 11:35:20 +000047#define PORT_HASH_BITS 8
48#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
stephen hemmingerd3428942012-10-01 12:32:35 +000049#define VNI_HASH_BITS 10
50#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
51#define FDB_HASH_BITS 8
52#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
53#define FDB_AGE_DEFAULT 300 /* 5 min */
54#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
55
56#define VXLAN_N_VID (1u << 24)
57#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
Alexander Duyck52b702f2012-11-09 13:35:24 +000058/* IP header + UDP + VXLAN + Ethernet header */
59#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
stephen hemmingerd3428942012-10-01 12:32:35 +000060
61#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
62
63/* VXLAN protocol header */
64struct vxlanhdr {
65 __be32 vx_flags;
66 __be32 vx_vni;
67};
68
stephen hemminger23c578b2013-04-27 11:31:53 +000069/* UDP port for VXLAN traffic.
70 * The IANA assigned port is 4789, but the Linux default is 8472
Stephen Hemminger234f5b72013-06-17 14:16:41 -070071 * for compatibility with early adopters.
stephen hemminger23c578b2013-04-27 11:31:53 +000072 */
Stephen Hemminger9daaa392013-06-17 14:16:12 -070073static unsigned short vxlan_port __read_mostly = 8472;
74module_param_named(udp_port, vxlan_port, ushort, 0444);
stephen hemmingerd3428942012-10-01 12:32:35 +000075MODULE_PARM_DESC(udp_port, "Destination UDP port");
76
77static bool log_ecn_error = true;
78module_param(log_ecn_error, bool, 0644);
79MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
80
Pravin B Shelar60d9d4c2013-06-20 00:26:31 -070081static int vxlan_net_id;
stephen hemminger553675f2013-05-16 11:35:20 +000082
Mike Rapoportafbd8ba2013-06-25 16:01:51 +030083static const u8 all_zeros_mac[ETH_ALEN];
84
stephen hemminger553675f2013-05-16 11:35:20 +000085/* per UDP socket information */
86struct vxlan_sock {
87 struct hlist_node hlist;
88 struct rcu_head rcu;
89 struct work_struct del_work;
Stephen Hemminger7c47ced2013-06-17 14:16:10 -070090 atomic_t refcnt;
stephen hemminger553675f2013-05-16 11:35:20 +000091 struct socket *sock;
stephen hemmingerd3428942012-10-01 12:32:35 +000092 struct hlist_head vni_list[VNI_HASH_SIZE];
93};
94
stephen hemminger553675f2013-05-16 11:35:20 +000095/* per-network namespace private data for this module */
96struct vxlan_net {
97 struct list_head vxlan_list;
98 struct hlist_head sock_list[PORT_HASH_SIZE];
Stephen Hemminger1c51a912013-06-17 14:16:11 -070099 spinlock_t sock_lock;
stephen hemminger553675f2013-05-16 11:35:20 +0000100};
101
David Stevens66817122013-03-15 04:35:51 +0000102struct vxlan_rdst {
David Stevens66817122013-03-15 04:35:51 +0000103 __be32 remote_ip;
104 __be16 remote_port;
105 u32 remote_vni;
106 u32 remote_ifindex;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700107 struct list_head list;
Mike Rapoportbc7892b2013-06-25 16:01:54 +0300108 struct rcu_head rcu;
David Stevens66817122013-03-15 04:35:51 +0000109};
110
stephen hemmingerd3428942012-10-01 12:32:35 +0000111/* Forwarding table entry */
112struct vxlan_fdb {
113 struct hlist_node hlist; /* linked list of entries */
114 struct rcu_head rcu;
115 unsigned long updated; /* jiffies */
116 unsigned long used;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700117 struct list_head remotes;
stephen hemmingerd3428942012-10-01 12:32:35 +0000118 u16 state; /* see ndm_state */
David Stevensae884082013-04-19 00:36:26 +0000119 u8 flags; /* see ndm_flags */
stephen hemmingerd3428942012-10-01 12:32:35 +0000120 u8 eth_addr[ETH_ALEN];
121};
122
stephen hemmingerd3428942012-10-01 12:32:35 +0000123/* Pseudo network device */
124struct vxlan_dev {
stephen hemminger553675f2013-05-16 11:35:20 +0000125 struct hlist_node hlist; /* vni hash table */
126 struct list_head next; /* vxlan's per namespace list */
127 struct vxlan_sock *vn_sock; /* listening socket */
stephen hemmingerd3428942012-10-01 12:32:35 +0000128 struct net_device *dev;
Atzm Watanabec7995c42013-04-16 02:50:52 +0000129 struct vxlan_rdst default_dst; /* default destination */
stephen hemmingerd3428942012-10-01 12:32:35 +0000130 __be32 saddr; /* source address */
stephen hemminger823aa872013-04-27 11:31:57 +0000131 __be16 dst_port;
stephen hemminger05f47d62012-10-09 20:35:50 +0000132 __u16 port_min; /* source port range */
133 __u16 port_max;
stephen hemmingerd3428942012-10-01 12:32:35 +0000134 __u8 tos; /* TOS override */
135 __u8 ttl;
David Stevense4f67ad2012-11-20 02:50:14 +0000136 u32 flags; /* VXLAN_F_* below */
stephen hemmingerd3428942012-10-01 12:32:35 +0000137
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700138 struct work_struct sock_work;
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700139 struct work_struct igmp_work;
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700140
stephen hemmingerd3428942012-10-01 12:32:35 +0000141 unsigned long age_interval;
142 struct timer_list age_timer;
143 spinlock_t hash_lock;
144 unsigned int addrcnt;
145 unsigned int addrmax;
stephen hemmingerd3428942012-10-01 12:32:35 +0000146
147 struct hlist_head fdb_head[FDB_HASH_SIZE];
148};
149
David Stevense4f67ad2012-11-20 02:50:14 +0000150#define VXLAN_F_LEARN 0x01
151#define VXLAN_F_PROXY 0x02
152#define VXLAN_F_RSC 0x04
153#define VXLAN_F_L2MISS 0x08
154#define VXLAN_F_L3MISS 0x10
155
stephen hemmingerd3428942012-10-01 12:32:35 +0000156/* salt for hash table */
157static u32 vxlan_salt __read_mostly;
Stephen Hemminger758c57d2013-06-17 14:16:09 -0700158static struct workqueue_struct *vxlan_wq;
stephen hemmingerd3428942012-10-01 12:32:35 +0000159
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700160static void vxlan_sock_work(struct work_struct *work);
161
stephen hemminger553675f2013-05-16 11:35:20 +0000162/* Virtual Network hash table head */
163static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
164{
165 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
166}
167
168/* Socket hash table head */
169static inline struct hlist_head *vs_head(struct net *net, __be16 port)
stephen hemmingerd3428942012-10-01 12:32:35 +0000170{
171 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
172
stephen hemminger553675f2013-05-16 11:35:20 +0000173 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
174}
175
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700176/* First remote destination for a forwarding entry.
177 * Guaranteed to be non-NULL because remotes are never deleted.
178 */
179static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb)
180{
181 return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list);
182}
183
stephen hemminger553675f2013-05-16 11:35:20 +0000184/* Find VXLAN socket based on network namespace and UDP port */
185static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
186{
187 struct vxlan_sock *vs;
188
189 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
190 if (inet_sk(vs->sock->sk)->inet_sport == port)
191 return vs;
192 }
193 return NULL;
stephen hemmingerd3428942012-10-01 12:32:35 +0000194}
195
196/* Look up VNI in a per net namespace table */
stephen hemminger553675f2013-05-16 11:35:20 +0000197static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
stephen hemmingerd3428942012-10-01 12:32:35 +0000198{
stephen hemminger553675f2013-05-16 11:35:20 +0000199 struct vxlan_sock *vs;
stephen hemmingerd3428942012-10-01 12:32:35 +0000200 struct vxlan_dev *vxlan;
stephen hemmingerd3428942012-10-01 12:32:35 +0000201
stephen hemminger553675f2013-05-16 11:35:20 +0000202 vs = vxlan_find_port(net, port);
203 if (!vs)
204 return NULL;
205
206 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
Atzm Watanabec7995c42013-04-16 02:50:52 +0000207 if (vxlan->default_dst.remote_vni == id)
stephen hemmingerd3428942012-10-01 12:32:35 +0000208 return vxlan;
209 }
210
211 return NULL;
212}
213
214/* Fill in neighbour message in skbuff. */
215static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
Stephen Hemminger234f5b72013-06-17 14:16:41 -0700216 const struct vxlan_fdb *fdb,
217 u32 portid, u32 seq, int type, unsigned int flags,
218 const struct vxlan_rdst *rdst)
stephen hemmingerd3428942012-10-01 12:32:35 +0000219{
220 unsigned long now = jiffies;
221 struct nda_cacheinfo ci;
222 struct nlmsghdr *nlh;
223 struct ndmsg *ndm;
David Stevense4f67ad2012-11-20 02:50:14 +0000224 bool send_ip, send_eth;
stephen hemmingerd3428942012-10-01 12:32:35 +0000225
226 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
227 if (nlh == NULL)
228 return -EMSGSIZE;
229
230 ndm = nlmsg_data(nlh);
231 memset(ndm, 0, sizeof(*ndm));
David Stevense4f67ad2012-11-20 02:50:14 +0000232
233 send_eth = send_ip = true;
234
235 if (type == RTM_GETNEIGH) {
236 ndm->ndm_family = AF_INET;
David Stevens66817122013-03-15 04:35:51 +0000237 send_ip = rdst->remote_ip != htonl(INADDR_ANY);
David Stevense4f67ad2012-11-20 02:50:14 +0000238 send_eth = !is_zero_ether_addr(fdb->eth_addr);
239 } else
240 ndm->ndm_family = AF_BRIDGE;
stephen hemmingerd3428942012-10-01 12:32:35 +0000241 ndm->ndm_state = fdb->state;
242 ndm->ndm_ifindex = vxlan->dev->ifindex;
David Stevensae884082013-04-19 00:36:26 +0000243 ndm->ndm_flags = fdb->flags;
stephen hemmingerd3428942012-10-01 12:32:35 +0000244 ndm->ndm_type = NDA_DST;
245
David Stevense4f67ad2012-11-20 02:50:14 +0000246 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
stephen hemmingerd3428942012-10-01 12:32:35 +0000247 goto nla_put_failure;
248
David Stevens66817122013-03-15 04:35:51 +0000249 if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
250 goto nla_put_failure;
251
stephen hemminger823aa872013-04-27 11:31:57 +0000252 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
David Stevens66817122013-03-15 04:35:51 +0000253 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
254 goto nla_put_failure;
Atzm Watanabec7995c42013-04-16 02:50:52 +0000255 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
Pravin B Shelar60d9d4c2013-06-20 00:26:31 -0700256 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
David Stevens66817122013-03-15 04:35:51 +0000257 goto nla_put_failure;
258 if (rdst->remote_ifindex &&
259 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
stephen hemmingerd3428942012-10-01 12:32:35 +0000260 goto nla_put_failure;
261
262 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
263 ci.ndm_confirmed = 0;
264 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
265 ci.ndm_refcnt = 0;
266
267 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
268 goto nla_put_failure;
269
270 return nlmsg_end(skb, nlh);
271
272nla_put_failure:
273 nlmsg_cancel(skb, nlh);
274 return -EMSGSIZE;
275}
276
277static inline size_t vxlan_nlmsg_size(void)
278{
279 return NLMSG_ALIGN(sizeof(struct ndmsg))
280 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
281 + nla_total_size(sizeof(__be32)) /* NDA_DST */
stephen hemminger73cf3312013-04-27 11:31:54 +0000282 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
David Stevens66817122013-03-15 04:35:51 +0000283 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
284 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
stephen hemmingerd3428942012-10-01 12:32:35 +0000285 + nla_total_size(sizeof(struct nda_cacheinfo));
286}
287
288static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700289 struct vxlan_fdb *fdb, int type)
stephen hemmingerd3428942012-10-01 12:32:35 +0000290{
291 struct net *net = dev_net(vxlan->dev);
292 struct sk_buff *skb;
293 int err = -ENOBUFS;
294
295 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
296 if (skb == NULL)
297 goto errout;
298
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700299 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb));
stephen hemmingerd3428942012-10-01 12:32:35 +0000300 if (err < 0) {
301 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
302 WARN_ON(err == -EMSGSIZE);
303 kfree_skb(skb);
304 goto errout;
305 }
306
307 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
308 return;
309errout:
310 if (err < 0)
311 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
312}
313
David Stevense4f67ad2012-11-20 02:50:14 +0000314static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
315{
316 struct vxlan_dev *vxlan = netdev_priv(dev);
Stephen Hemmingerbb3fd682013-06-17 14:16:40 -0700317 struct vxlan_fdb f = {
318 .state = NUD_STALE,
319 };
320 struct vxlan_rdst remote = {
321 .remote_ip = ipa, /* goes to NDA_DST */
322 .remote_vni = VXLAN_N_VID,
323 };
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700324
325 INIT_LIST_HEAD(&f.remotes);
326 list_add_rcu(&remote.list, &f.remotes);
David Stevense4f67ad2012-11-20 02:50:14 +0000327
328 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
329}
330
331static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
332{
Stephen Hemmingerbb3fd682013-06-17 14:16:40 -0700333 struct vxlan_fdb f = {
334 .state = NUD_STALE,
335 };
David Stevense4f67ad2012-11-20 02:50:14 +0000336
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700337 INIT_LIST_HEAD(&f.remotes);
David Stevense4f67ad2012-11-20 02:50:14 +0000338 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
339
340 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
341}
342
stephen hemmingerd3428942012-10-01 12:32:35 +0000343/* Hash Ethernet address */
344static u32 eth_hash(const unsigned char *addr)
345{
346 u64 value = get_unaligned((u64 *)addr);
347
348 /* only want 6 bytes */
349#ifdef __BIG_ENDIAN
stephen hemmingerd3428942012-10-01 12:32:35 +0000350 value >>= 16;
stephen hemminger321fb992012-10-09 20:35:47 +0000351#else
352 value <<= 16;
stephen hemmingerd3428942012-10-01 12:32:35 +0000353#endif
354 return hash_64(value, FDB_HASH_BITS);
355}
356
357/* Hash chain to use given mac address */
358static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
359 const u8 *mac)
360{
361 return &vxlan->fdb_head[eth_hash(mac)];
362}
363
364/* Look up Ethernet address in forwarding table */
Sridhar Samudrala014be2c2013-05-17 06:39:07 +0000365static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
stephen hemmingerd3428942012-10-01 12:32:35 +0000366 const u8 *mac)
367
368{
369 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
370 struct vxlan_fdb *f;
stephen hemmingerd3428942012-10-01 12:32:35 +0000371
Sasha Levinb67bfe02013-02-27 17:06:00 -0800372 hlist_for_each_entry_rcu(f, head, hlist) {
stephen hemmingerd3428942012-10-01 12:32:35 +0000373 if (compare_ether_addr(mac, f->eth_addr) == 0)
374 return f;
375 }
376
377 return NULL;
378}
379
Sridhar Samudrala014be2c2013-05-17 06:39:07 +0000380static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
381 const u8 *mac)
382{
383 struct vxlan_fdb *f;
384
385 f = __vxlan_find_mac(vxlan, mac);
386 if (f)
387 f->used = jiffies;
388
389 return f;
390}
391
Mike Rapoporta5e7c102013-06-25 16:01:52 +0300392/* caller should hold vxlan->hash_lock */
393static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
394 __be32 ip, __be16 port,
395 __u32 vni, __u32 ifindex)
396{
397 struct vxlan_rdst *rd;
398
399 list_for_each_entry(rd, &f->remotes, list) {
400 if (rd->remote_ip == ip &&
401 rd->remote_port == port &&
402 rd->remote_vni == vni &&
403 rd->remote_ifindex == ifindex)
404 return rd;
405 }
406
407 return NULL;
408}
409
David Stevens66817122013-03-15 04:35:51 +0000410/* Add/update destinations for multicast */
411static int vxlan_fdb_append(struct vxlan_fdb *f,
stephen hemminger73cf3312013-04-27 11:31:54 +0000412 __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
David Stevens66817122013-03-15 04:35:51 +0000413{
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700414 struct vxlan_rdst *rd;
David Stevens66817122013-03-15 04:35:51 +0000415
Mike Rapoporta5e7c102013-06-25 16:01:52 +0300416 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
417 if (rd)
418 return 0;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700419
David Stevens66817122013-03-15 04:35:51 +0000420 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
421 if (rd == NULL)
422 return -ENOBUFS;
423 rd->remote_ip = ip;
424 rd->remote_port = port;
425 rd->remote_vni = vni;
426 rd->remote_ifindex = ifindex;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700427
428 list_add_tail_rcu(&rd->list, &f->remotes);
429
David Stevens66817122013-03-15 04:35:51 +0000430 return 1;
431}
432
stephen hemmingerd3428942012-10-01 12:32:35 +0000433/* Add new entry to forwarding table -- assumes lock held */
434static int vxlan_fdb_create(struct vxlan_dev *vxlan,
435 const u8 *mac, __be32 ip,
David Stevens66817122013-03-15 04:35:51 +0000436 __u16 state, __u16 flags,
stephen hemminger73cf3312013-04-27 11:31:54 +0000437 __be16 port, __u32 vni, __u32 ifindex,
David Stevensae884082013-04-19 00:36:26 +0000438 __u8 ndm_flags)
stephen hemmingerd3428942012-10-01 12:32:35 +0000439{
440 struct vxlan_fdb *f;
441 int notify = 0;
442
Sridhar Samudrala014be2c2013-05-17 06:39:07 +0000443 f = __vxlan_find_mac(vxlan, mac);
stephen hemmingerd3428942012-10-01 12:32:35 +0000444 if (f) {
445 if (flags & NLM_F_EXCL) {
446 netdev_dbg(vxlan->dev,
447 "lost race to create %pM\n", mac);
448 return -EEXIST;
449 }
450 if (f->state != state) {
451 f->state = state;
452 f->updated = jiffies;
453 notify = 1;
454 }
David Stevensae884082013-04-19 00:36:26 +0000455 if (f->flags != ndm_flags) {
456 f->flags = ndm_flags;
457 f->updated = jiffies;
458 notify = 1;
459 }
David Stevens66817122013-03-15 04:35:51 +0000460 if ((flags & NLM_F_APPEND) &&
Mike Rapoport58e4c762013-06-25 16:01:56 +0300461 (is_multicast_ether_addr(f->eth_addr) ||
462 is_zero_ether_addr(f->eth_addr))) {
David Stevens66817122013-03-15 04:35:51 +0000463 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
464
465 if (rc < 0)
466 return rc;
467 notify |= rc;
468 }
stephen hemmingerd3428942012-10-01 12:32:35 +0000469 } else {
470 if (!(flags & NLM_F_CREATE))
471 return -ENOENT;
472
473 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
474 return -ENOSPC;
475
476 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
477 f = kmalloc(sizeof(*f), GFP_ATOMIC);
478 if (!f)
479 return -ENOMEM;
480
481 notify = 1;
stephen hemmingerd3428942012-10-01 12:32:35 +0000482 f->state = state;
David Stevensae884082013-04-19 00:36:26 +0000483 f->flags = ndm_flags;
stephen hemmingerd3428942012-10-01 12:32:35 +0000484 f->updated = f->used = jiffies;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700485 INIT_LIST_HEAD(&f->remotes);
stephen hemmingerd3428942012-10-01 12:32:35 +0000486 memcpy(f->eth_addr, mac, ETH_ALEN);
487
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700488 vxlan_fdb_append(f, ip, port, vni, ifindex);
489
stephen hemmingerd3428942012-10-01 12:32:35 +0000490 ++vxlan->addrcnt;
491 hlist_add_head_rcu(&f->hlist,
492 vxlan_fdb_head(vxlan, mac));
493 }
494
495 if (notify)
496 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
497
498 return 0;
499}
500
Mike Rapoportbc7892b2013-06-25 16:01:54 +0300501static void vxlan_fdb_free_rdst(struct rcu_head *head)
502{
503 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
504 kfree(rd);
505}
506
Wei Yongjun6706c822013-04-11 19:00:35 +0000507static void vxlan_fdb_free(struct rcu_head *head)
David Stevens66817122013-03-15 04:35:51 +0000508{
509 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700510 struct vxlan_rdst *rd, *nd;
David Stevens66817122013-03-15 04:35:51 +0000511
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700512 list_for_each_entry_safe(rd, nd, &f->remotes, list)
David Stevens66817122013-03-15 04:35:51 +0000513 kfree(rd);
David Stevens66817122013-03-15 04:35:51 +0000514 kfree(f);
515}
516
stephen hemmingerd3428942012-10-01 12:32:35 +0000517static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
518{
519 netdev_dbg(vxlan->dev,
520 "delete %pM\n", f->eth_addr);
521
522 --vxlan->addrcnt;
523 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
524
525 hlist_del_rcu(&f->hlist);
David Stevens66817122013-03-15 04:35:51 +0000526 call_rcu(&f->rcu, vxlan_fdb_free);
stephen hemmingerd3428942012-10-01 12:32:35 +0000527}
528
Mike Rapoportf0b074b2013-06-25 16:01:53 +0300529static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
530 __be32 *ip, __be16 *port, u32 *vni, u32 *ifindex)
531{
532 struct net *net = dev_net(vxlan->dev);
533
534 if (tb[NDA_DST]) {
535 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
536 return -EAFNOSUPPORT;
537
538 *ip = nla_get_be32(tb[NDA_DST]);
539 } else {
540 *ip = htonl(INADDR_ANY);
541 }
542
543 if (tb[NDA_PORT]) {
544 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
545 return -EINVAL;
546 *port = nla_get_be16(tb[NDA_PORT]);
547 } else {
548 *port = vxlan->dst_port;
549 }
550
551 if (tb[NDA_VNI]) {
552 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
553 return -EINVAL;
554 *vni = nla_get_u32(tb[NDA_VNI]);
555 } else {
556 *vni = vxlan->default_dst.remote_vni;
557 }
558
559 if (tb[NDA_IFINDEX]) {
560 struct net_device *tdev;
561
562 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
563 return -EINVAL;
564 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
565 tdev = dev_get_by_index(net, *ifindex);
566 if (!tdev)
567 return -EADDRNOTAVAIL;
568 dev_put(tdev);
569 } else {
570 *ifindex = 0;
571 }
572
573 return 0;
574}
575
stephen hemmingerd3428942012-10-01 12:32:35 +0000576/* Add static entry (via netlink) */
577static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
578 struct net_device *dev,
579 const unsigned char *addr, u16 flags)
580{
581 struct vxlan_dev *vxlan = netdev_priv(dev);
Mike Rapoportf0b074b2013-06-25 16:01:53 +0300582 /* struct net *net = dev_net(vxlan->dev); */
stephen hemmingerd3428942012-10-01 12:32:35 +0000583 __be32 ip;
stephen hemminger73cf3312013-04-27 11:31:54 +0000584 __be16 port;
585 u32 vni, ifindex;
stephen hemmingerd3428942012-10-01 12:32:35 +0000586 int err;
587
588 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
589 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
590 ndm->ndm_state);
591 return -EINVAL;
592 }
593
594 if (tb[NDA_DST] == NULL)
595 return -EINVAL;
596
Mike Rapoportf0b074b2013-06-25 16:01:53 +0300597 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
598 if (err)
599 return err;
David Stevens66817122013-03-15 04:35:51 +0000600
stephen hemmingerd3428942012-10-01 12:32:35 +0000601 spin_lock_bh(&vxlan->hash_lock);
stephen hemminger73cf3312013-04-27 11:31:54 +0000602 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags,
603 port, vni, ifindex, ndm->ndm_flags);
stephen hemmingerd3428942012-10-01 12:32:35 +0000604 spin_unlock_bh(&vxlan->hash_lock);
605
606 return err;
607}
608
609/* Delete entry (via netlink) */
Vlad Yasevich1690be62013-02-13 12:00:18 +0000610static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
611 struct net_device *dev,
stephen hemmingerd3428942012-10-01 12:32:35 +0000612 const unsigned char *addr)
613{
614 struct vxlan_dev *vxlan = netdev_priv(dev);
615 struct vxlan_fdb *f;
Mike Rapoportbc7892b2013-06-25 16:01:54 +0300616 struct vxlan_rdst *rd = NULL;
617 __be32 ip;
618 __be16 port;
619 u32 vni, ifindex;
620 int err;
621
622 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
623 if (err)
624 return err;
625
626 err = -ENOENT;
stephen hemmingerd3428942012-10-01 12:32:35 +0000627
628 spin_lock_bh(&vxlan->hash_lock);
629 f = vxlan_find_mac(vxlan, addr);
Mike Rapoportbc7892b2013-06-25 16:01:54 +0300630 if (!f)
631 goto out;
632
633 if (ip != htonl(INADDR_ANY)) {
634 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
635 if (!rd)
636 goto out;
stephen hemmingerd3428942012-10-01 12:32:35 +0000637 }
Mike Rapoportbc7892b2013-06-25 16:01:54 +0300638
639 err = 0;
640
641 /* remove a destination if it's not the only one on the list,
642 * otherwise destroy the fdb entry
643 */
644 if (rd && !list_is_singular(&f->remotes)) {
645 list_del_rcu(&rd->list);
646 call_rcu(&rd->rcu, vxlan_fdb_free_rdst);
647 goto out;
648 }
649
650 vxlan_fdb_destroy(vxlan, f);
651
652out:
stephen hemmingerd3428942012-10-01 12:32:35 +0000653 spin_unlock_bh(&vxlan->hash_lock);
654
655 return err;
656}
657
658/* Dump forwarding table */
659static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
660 struct net_device *dev, int idx)
661{
662 struct vxlan_dev *vxlan = netdev_priv(dev);
663 unsigned int h;
664
665 for (h = 0; h < FDB_HASH_SIZE; ++h) {
666 struct vxlan_fdb *f;
stephen hemmingerd3428942012-10-01 12:32:35 +0000667 int err;
668
Sasha Levinb67bfe02013-02-27 17:06:00 -0800669 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
David Stevens66817122013-03-15 04:35:51 +0000670 struct vxlan_rdst *rd;
stephen hemmingerd3428942012-10-01 12:32:35 +0000671
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700672 if (idx < cb->args[0])
673 goto skip;
674
675 list_for_each_entry_rcu(rd, &f->remotes, list) {
David Stevens66817122013-03-15 04:35:51 +0000676 err = vxlan_fdb_info(skb, vxlan, f,
677 NETLINK_CB(cb->skb).portid,
678 cb->nlh->nlmsg_seq,
679 RTM_NEWNEIGH,
680 NLM_F_MULTI, rd);
681 if (err < 0)
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700682 goto out;
David Stevens66817122013-03-15 04:35:51 +0000683 }
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700684skip:
685 ++idx;
stephen hemmingerd3428942012-10-01 12:32:35 +0000686 }
687 }
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700688out:
stephen hemmingerd3428942012-10-01 12:32:35 +0000689 return idx;
690}
691
692/* Watch incoming packets to learn mapping between Ethernet address
693 * and Tunnel endpoint.
stephen hemminger26a41ae62013-06-17 12:09:58 -0700694 * Return true if packet is bogus and should be droppped.
stephen hemmingerd3428942012-10-01 12:32:35 +0000695 */
stephen hemminger26a41ae62013-06-17 12:09:58 -0700696static bool vxlan_snoop(struct net_device *dev,
stephen hemmingerd3428942012-10-01 12:32:35 +0000697 __be32 src_ip, const u8 *src_mac)
698{
699 struct vxlan_dev *vxlan = netdev_priv(dev);
700 struct vxlan_fdb *f;
stephen hemmingerd3428942012-10-01 12:32:35 +0000701
702 f = vxlan_find_mac(vxlan, src_mac);
703 if (likely(f)) {
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700704 struct vxlan_rdst *rdst = first_remote(f);
705
706 if (likely(rdst->remote_ip == src_ip))
stephen hemminger26a41ae62013-06-17 12:09:58 -0700707 return false;
708
709 /* Don't migrate static entries, drop packets */
stephen hemmingereb064c32013-06-18 14:27:01 -0700710 if (f->state & NUD_NOARP)
stephen hemminger26a41ae62013-06-17 12:09:58 -0700711 return true;
stephen hemmingerd3428942012-10-01 12:32:35 +0000712
713 if (net_ratelimit())
714 netdev_info(dev,
715 "%pM migrated from %pI4 to %pI4\n",
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700716 src_mac, &rdst->remote_ip, &src_ip);
stephen hemmingerd3428942012-10-01 12:32:35 +0000717
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700718 rdst->remote_ip = src_ip;
stephen hemmingerd3428942012-10-01 12:32:35 +0000719 f->updated = jiffies;
Stephen Hemminger8385f502013-06-17 14:16:10 -0700720 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
stephen hemmingerd3428942012-10-01 12:32:35 +0000721 } else {
722 /* learned new entry */
723 spin_lock(&vxlan->hash_lock);
stephen hemminger3bf74b12013-06-17 12:09:57 -0700724
725 /* close off race between vxlan_flush and incoming packets */
726 if (netif_running(dev))
727 vxlan_fdb_create(vxlan, src_mac, src_ip,
728 NUD_REACHABLE,
729 NLM_F_EXCL|NLM_F_CREATE,
730 vxlan->dst_port,
731 vxlan->default_dst.remote_vni,
732 0, NTF_SELF);
stephen hemmingerd3428942012-10-01 12:32:35 +0000733 spin_unlock(&vxlan->hash_lock);
734 }
stephen hemminger26a41ae62013-06-17 12:09:58 -0700735
736 return false;
stephen hemmingerd3428942012-10-01 12:32:35 +0000737}
738
739
740/* See if multicast group is already in use by other ID */
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700741static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip)
stephen hemmingerd3428942012-10-01 12:32:35 +0000742{
stephen hemminger553675f2013-05-16 11:35:20 +0000743 struct vxlan_dev *vxlan;
stephen hemmingerd3428942012-10-01 12:32:35 +0000744
stephen hemminger553675f2013-05-16 11:35:20 +0000745 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
stephen hemminger553675f2013-05-16 11:35:20 +0000746 if (!netif_running(vxlan->dev))
747 continue;
stephen hemmingerd3428942012-10-01 12:32:35 +0000748
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700749 if (vxlan->default_dst.remote_ip == remote_ip)
stephen hemminger553675f2013-05-16 11:35:20 +0000750 return true;
751 }
stephen hemmingerd3428942012-10-01 12:32:35 +0000752
753 return false;
754}
755
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700756static void vxlan_sock_hold(struct vxlan_sock *vs)
stephen hemmingerd3428942012-10-01 12:32:35 +0000757{
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700758 atomic_inc(&vs->refcnt);
stephen hemmingerd3428942012-10-01 12:32:35 +0000759}
760
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700761static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs)
stephen hemmingerd3428942012-10-01 12:32:35 +0000762{
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700763 if (!atomic_dec_and_test(&vs->refcnt))
764 return;
765
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700766 spin_lock(&vn->sock_lock);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700767 hlist_del_rcu(&vs->hlist);
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700768 spin_unlock(&vn->sock_lock);
769
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700770 queue_work(vxlan_wq, &vs->del_work);
771}
772
773/* Callback to update multicast group membership.
774 * Scheduled when vxlan goes up/down.
775 */
776static void vxlan_igmp_work(struct work_struct *work)
777{
778 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work);
779 struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id);
780 struct vxlan_sock *vs = vxlan->vn_sock;
781 struct sock *sk = vs->sock->sk;
stephen hemmingerd3428942012-10-01 12:32:35 +0000782 struct ip_mreqn mreq = {
Atzm Watanabec7995c42013-04-16 02:50:52 +0000783 .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip,
784 .imr_ifindex = vxlan->default_dst.remote_ifindex,
stephen hemmingerd3428942012-10-01 12:32:35 +0000785 };
786
stephen hemmingerd3428942012-10-01 12:32:35 +0000787 lock_sock(sk);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700788 if (vxlan_group_used(vn, vxlan->default_dst.remote_ip))
789 ip_mc_join_group(sk, &mreq);
790 else
791 ip_mc_leave_group(sk, &mreq);
stephen hemmingerd3428942012-10-01 12:32:35 +0000792 release_sock(sk);
stephen hemmingerd3428942012-10-01 12:32:35 +0000793
Stephen Hemminger1c51a912013-06-17 14:16:11 -0700794 vxlan_sock_release(vn, vs);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -0700795 dev_put(vxlan->dev);
stephen hemmingerd3428942012-10-01 12:32:35 +0000796}
797
798/* Callback from net/ipv4/udp.c to receive packets */
799static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
800{
801 struct iphdr *oip;
802 struct vxlanhdr *vxh;
803 struct vxlan_dev *vxlan;
Pravin B Shelare8171042013-03-25 14:49:46 +0000804 struct pcpu_tstats *stats;
stephen hemminger553675f2013-05-16 11:35:20 +0000805 __be16 port;
stephen hemmingerd3428942012-10-01 12:32:35 +0000806 __u32 vni;
807 int err;
808
809 /* pop off outer UDP header */
810 __skb_pull(skb, sizeof(struct udphdr));
811
812 /* Need Vxlan and inner Ethernet header to be present */
813 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
814 goto error;
815
816 /* Drop packets with reserved bits set */
817 vxh = (struct vxlanhdr *) skb->data;
818 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
819 (vxh->vx_vni & htonl(0xff))) {
820 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
821 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
822 goto error;
823 }
824
825 __skb_pull(skb, sizeof(struct vxlanhdr));
stephen hemmingerd3428942012-10-01 12:32:35 +0000826
827 /* Is this VNI defined? */
828 vni = ntohl(vxh->vx_vni) >> 8;
stephen hemminger553675f2013-05-16 11:35:20 +0000829 port = inet_sk(sk)->inet_sport;
830 vxlan = vxlan_find_vni(sock_net(sk), vni, port);
stephen hemmingerd3428942012-10-01 12:32:35 +0000831 if (!vxlan) {
stephen hemminger553675f2013-05-16 11:35:20 +0000832 netdev_dbg(skb->dev, "unknown vni %d port %u\n",
833 vni, ntohs(port));
stephen hemmingerd3428942012-10-01 12:32:35 +0000834 goto drop;
835 }
836
837 if (!pskb_may_pull(skb, ETH_HLEN)) {
838 vxlan->dev->stats.rx_length_errors++;
839 vxlan->dev->stats.rx_errors++;
840 goto drop;
841 }
842
David Stevense4f67ad2012-11-20 02:50:14 +0000843 skb_reset_mac_header(skb);
844
stephen hemmingerd3428942012-10-01 12:32:35 +0000845 /* Re-examine inner Ethernet packet */
846 oip = ip_hdr(skb);
847 skb->protocol = eth_type_trans(skb, vxlan->dev);
stephen hemmingerd3428942012-10-01 12:32:35 +0000848
849 /* Ignore packet loops (and multicast echo) */
850 if (compare_ether_addr(eth_hdr(skb)->h_source,
851 vxlan->dev->dev_addr) == 0)
852 goto drop;
853
stephen hemminger26a41ae62013-06-17 12:09:58 -0700854 if ((vxlan->flags & VXLAN_F_LEARN) &&
855 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
856 goto drop;
stephen hemmingerd3428942012-10-01 12:32:35 +0000857
858 __skb_tunnel_rx(skb, vxlan->dev);
859 skb_reset_network_header(skb);
Joseph Gasparakis0afb1662012-12-07 14:14:18 +0000860
861 /* If the NIC driver gave us an encapsulated packet with
862 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
863 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
864 * for us. Otherwise force the upper layers to verify it.
865 */
866 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
867 !(vxlan->dev->features & NETIF_F_RXCSUM))
868 skb->ip_summed = CHECKSUM_NONE;
869
870 skb->encapsulation = 0;
stephen hemmingerd3428942012-10-01 12:32:35 +0000871
872 err = IP_ECN_decapsulate(oip, skb);
873 if (unlikely(err)) {
874 if (log_ecn_error)
875 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
876 &oip->saddr, oip->tos);
877 if (err > 1) {
878 ++vxlan->dev->stats.rx_frame_errors;
879 ++vxlan->dev->stats.rx_errors;
880 goto drop;
881 }
882 }
883
Pravin B Shelare8171042013-03-25 14:49:46 +0000884 stats = this_cpu_ptr(vxlan->dev->tstats);
stephen hemmingerd3428942012-10-01 12:32:35 +0000885 u64_stats_update_begin(&stats->syncp);
886 stats->rx_packets++;
887 stats->rx_bytes += skb->len;
888 u64_stats_update_end(&stats->syncp);
889
890 netif_rx(skb);
891
892 return 0;
893error:
894 /* Put UDP header back */
895 __skb_push(skb, sizeof(struct udphdr));
896
897 return 1;
898drop:
899 /* Consume bad packet */
900 kfree_skb(skb);
901 return 0;
902}
903
David Stevense4f67ad2012-11-20 02:50:14 +0000904static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
905{
906 struct vxlan_dev *vxlan = netdev_priv(dev);
907 struct arphdr *parp;
908 u8 *arpptr, *sha;
909 __be32 sip, tip;
910 struct neighbour *n;
911
912 if (dev->flags & IFF_NOARP)
913 goto out;
914
915 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
916 dev->stats.tx_dropped++;
917 goto out;
918 }
919 parp = arp_hdr(skb);
920
921 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
922 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
923 parp->ar_pro != htons(ETH_P_IP) ||
924 parp->ar_op != htons(ARPOP_REQUEST) ||
925 parp->ar_hln != dev->addr_len ||
926 parp->ar_pln != 4)
927 goto out;
928 arpptr = (u8 *)parp + sizeof(struct arphdr);
929 sha = arpptr;
930 arpptr += dev->addr_len; /* sha */
931 memcpy(&sip, arpptr, sizeof(sip));
932 arpptr += sizeof(sip);
933 arpptr += dev->addr_len; /* tha */
934 memcpy(&tip, arpptr, sizeof(tip));
935
936 if (ipv4_is_loopback(tip) ||
937 ipv4_is_multicast(tip))
938 goto out;
939
940 n = neigh_lookup(&arp_tbl, &tip, dev);
941
942 if (n) {
David Stevense4f67ad2012-11-20 02:50:14 +0000943 struct vxlan_fdb *f;
944 struct sk_buff *reply;
945
946 if (!(n->nud_state & NUD_CONNECTED)) {
947 neigh_release(n);
948 goto out;
949 }
950
951 f = vxlan_find_mac(vxlan, n->ha);
Stephen Hemminger3e61aa82013-06-17 14:16:12 -0700952 if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) {
David Stevense4f67ad2012-11-20 02:50:14 +0000953 /* bridge-local neighbor */
954 neigh_release(n);
955 goto out;
956 }
957
958 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
959 n->ha, sha);
960
961 neigh_release(n);
962
963 skb_reset_mac_header(reply);
964 __skb_pull(reply, skb_network_offset(reply));
965 reply->ip_summed = CHECKSUM_UNNECESSARY;
966 reply->pkt_type = PACKET_HOST;
967
968 if (netif_rx_ni(reply) == NET_RX_DROP)
969 dev->stats.rx_dropped++;
970 } else if (vxlan->flags & VXLAN_F_L3MISS)
971 vxlan_ip_miss(dev, tip);
972out:
973 consume_skb(skb);
974 return NETDEV_TX_OK;
975}
976
977static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
978{
979 struct vxlan_dev *vxlan = netdev_priv(dev);
980 struct neighbour *n;
981 struct iphdr *pip;
982
983 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
984 return false;
985
986 n = NULL;
987 switch (ntohs(eth_hdr(skb)->h_proto)) {
988 case ETH_P_IP:
989 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
990 return false;
991 pip = ip_hdr(skb);
992 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
993 break;
994 default:
995 return false;
996 }
997
998 if (n) {
999 bool diff;
1000
1001 diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
1002 if (diff) {
1003 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1004 dev->addr_len);
1005 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1006 }
1007 neigh_release(n);
1008 return diff;
1009 } else if (vxlan->flags & VXLAN_F_L3MISS)
1010 vxlan_ip_miss(dev, pip->daddr);
1011 return false;
1012}
1013
stephen hemminger553675f2013-05-16 11:35:20 +00001014static void vxlan_sock_put(struct sk_buff *skb)
stephen hemminger1cad8712012-10-09 20:35:49 +00001015{
1016 sock_put(skb->sk);
1017}
1018
1019/* On transmit, associate with the tunnel socket */
1020static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
1021{
stephen hemminger553675f2013-05-16 11:35:20 +00001022 struct vxlan_dev *vxlan = netdev_priv(dev);
1023 struct sock *sk = vxlan->vn_sock->sock->sk;
stephen hemminger1cad8712012-10-09 20:35:49 +00001024
1025 skb_orphan(skb);
1026 sock_hold(sk);
1027 skb->sk = sk;
stephen hemminger553675f2013-05-16 11:35:20 +00001028 skb->destructor = vxlan_sock_put;
stephen hemminger1cad8712012-10-09 20:35:49 +00001029}
1030
stephen hemminger05f47d62012-10-09 20:35:50 +00001031/* Compute source port for outgoing packet
1032 * first choice to use L4 flow hash since it will spread
1033 * better and maybe available from hardware
1034 * secondary choice is to use jhash on the Ethernet header
1035 */
stephen hemminger7d836a72013-04-27 11:31:56 +00001036static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
stephen hemminger05f47d62012-10-09 20:35:50 +00001037{
1038 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
1039 u32 hash;
1040
1041 hash = skb_get_rxhash(skb);
1042 if (!hash)
1043 hash = jhash(skb->data, 2 * ETH_ALEN,
1044 (__force u32) skb->protocol);
1045
stephen hemminger7d836a72013-04-27 11:31:56 +00001046 return htons((((u64) hash * range) >> 32) + vxlan->port_min);
stephen hemminger05f47d62012-10-09 20:35:50 +00001047}
1048
Pravin B Shelar05c0db02013-03-07 13:22:36 +00001049static int handle_offloads(struct sk_buff *skb)
1050{
1051 if (skb_is_gso(skb)) {
1052 int err = skb_unclone(skb, GFP_ATOMIC);
1053 if (unlikely(err))
1054 return err;
1055
Dmitry Kravkovf6ace502013-04-28 08:16:01 +00001056 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
Pravin B Shelar05c0db02013-03-07 13:22:36 +00001057 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1058 skb->ip_summed = CHECKSUM_NONE;
1059
1060 return 0;
1061}
1062
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001063/* Bypass encapsulation if the destination is local */
1064static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1065 struct vxlan_dev *dst_vxlan)
1066{
1067 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1068 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1069
1070 skb->pkt_type = PACKET_HOST;
1071 skb->encapsulation = 0;
1072 skb->dev = dst_vxlan->dev;
1073 __skb_pull(skb, skb_network_offset(skb));
1074
1075 if (dst_vxlan->flags & VXLAN_F_LEARN)
Mike Rapoport9d9f1632013-04-13 23:21:39 +00001076 vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
1077 eth_hdr(skb)->h_source);
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001078
1079 u64_stats_update_begin(&tx_stats->syncp);
1080 tx_stats->tx_packets++;
1081 tx_stats->tx_bytes += skb->len;
1082 u64_stats_update_end(&tx_stats->syncp);
1083
1084 if (netif_rx(skb) == NET_RX_SUCCESS) {
1085 u64_stats_update_begin(&rx_stats->syncp);
1086 rx_stats->rx_packets++;
1087 rx_stats->rx_bytes += skb->len;
1088 u64_stats_update_end(&rx_stats->syncp);
1089 } else {
1090 skb->dev->stats.rx_dropped++;
1091 }
1092}
1093
Stephen Hemminger4ad16932013-06-17 14:16:11 -07001094static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1095 struct vxlan_rdst *rdst, bool did_rsc)
stephen hemmingerd3428942012-10-01 12:32:35 +00001096{
1097 struct vxlan_dev *vxlan = netdev_priv(dev);
1098 struct rtable *rt;
stephen hemmingerd3428942012-10-01 12:32:35 +00001099 const struct iphdr *old_iph;
stephen hemmingerd3428942012-10-01 12:32:35 +00001100 struct vxlanhdr *vxh;
1101 struct udphdr *uh;
1102 struct flowi4 fl4;
stephen hemmingerd3428942012-10-01 12:32:35 +00001103 __be32 dst;
stephen hemminger7d836a72013-04-27 11:31:56 +00001104 __be16 src_port, dst_port;
Stephen Hemminger234f5b72013-06-17 14:16:41 -07001105 u32 vni;
stephen hemmingerd3428942012-10-01 12:32:35 +00001106 __be16 df = 0;
1107 __u8 tos, ttl;
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -07001108 int err;
stephen hemmingerd3428942012-10-01 12:32:35 +00001109
stephen hemminger823aa872013-04-27 11:31:57 +00001110 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
David Stevens66817122013-03-15 04:35:51 +00001111 vni = rdst->remote_vni;
1112 dst = rdst->remote_ip;
David Stevense4f67ad2012-11-20 02:50:14 +00001113
1114 if (!dst) {
1115 if (did_rsc) {
David Stevense4f67ad2012-11-20 02:50:14 +00001116 /* short-circuited back to local bridge */
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001117 vxlan_encap_bypass(skb, vxlan, vxlan);
Stephen Hemminger4ad16932013-06-17 14:16:11 -07001118 return;
David Stevense4f67ad2012-11-20 02:50:14 +00001119 }
stephen hemmingeref59feb2012-10-09 20:35:46 +00001120 goto drop;
David Stevense4f67ad2012-11-20 02:50:14 +00001121 }
stephen hemmingeref59feb2012-10-09 20:35:46 +00001122
Joseph Gasparakisd6727fe2012-12-07 14:14:16 +00001123 if (!skb->encapsulation) {
1124 skb_reset_inner_headers(skb);
1125 skb->encapsulation = 1;
1126 }
1127
stephen hemmingerd3428942012-10-01 12:32:35 +00001128 /* Need space for new headers (invalidates iph ptr) */
1129 if (skb_cow_head(skb, VXLAN_HEADROOM))
1130 goto drop;
1131
stephen hemmingerd3428942012-10-01 12:32:35 +00001132 old_iph = ip_hdr(skb);
1133
stephen hemmingerd3428942012-10-01 12:32:35 +00001134 ttl = vxlan->ttl;
1135 if (!ttl && IN_MULTICAST(ntohl(dst)))
1136 ttl = 1;
1137
1138 tos = vxlan->tos;
1139 if (tos == 1)
Pravin B Shelar206aaaf2013-03-25 14:49:53 +00001140 tos = ip_tunnel_get_dsfield(old_iph, skb);
stephen hemmingerd3428942012-10-01 12:32:35 +00001141
stephen hemminger05f47d62012-10-09 20:35:50 +00001142 src_port = vxlan_src_port(vxlan, skb);
stephen hemmingerd3428942012-10-01 12:32:35 +00001143
stephen hemmingerca78f182012-10-09 20:35:48 +00001144 memset(&fl4, 0, sizeof(fl4));
David Stevens66817122013-03-15 04:35:51 +00001145 fl4.flowi4_oif = rdst->remote_ifindex;
stephen hemmingerca78f182012-10-09 20:35:48 +00001146 fl4.flowi4_tos = RT_TOS(tos);
1147 fl4.daddr = dst;
1148 fl4.saddr = vxlan->saddr;
1149
1150 rt = ip_route_output_key(dev_net(dev), &fl4);
stephen hemmingerd3428942012-10-01 12:32:35 +00001151 if (IS_ERR(rt)) {
1152 netdev_dbg(dev, "no route to %pI4\n", &dst);
1153 dev->stats.tx_carrier_errors++;
1154 goto tx_error;
1155 }
1156
1157 if (rt->dst.dev == dev) {
1158 netdev_dbg(dev, "circular route to %pI4\n", &dst);
1159 ip_rt_put(rt);
1160 dev->stats.collisions++;
1161 goto tx_error;
1162 }
1163
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001164 /* Bypass encapsulation if the destination is local */
Mike Rapoportab09a6d2013-04-13 23:21:51 +00001165 if (rt->rt_flags & RTCF_LOCAL &&
1166 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001167 struct vxlan_dev *dst_vxlan;
1168
1169 ip_rt_put(rt);
stephen hemminger553675f2013-05-16 11:35:20 +00001170 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001171 if (!dst_vxlan)
1172 goto tx_error;
1173 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
Stephen Hemminger4ad16932013-06-17 14:16:11 -07001174 return;
Sridhar Samudrala9dcc71e2013-04-02 12:31:52 +00001175 }
stephen hemmingerd3428942012-10-01 12:32:35 +00001176 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1177 vxh->vx_flags = htonl(VXLAN_FLAGS);
David Stevens66817122013-03-15 04:35:51 +00001178 vxh->vx_vni = htonl(vni << 8);
stephen hemmingerd3428942012-10-01 12:32:35 +00001179
1180 __skb_push(skb, sizeof(*uh));
1181 skb_reset_transport_header(skb);
1182 uh = udp_hdr(skb);
1183
stephen hemminger73cf3312013-04-27 11:31:54 +00001184 uh->dest = dst_port;
stephen hemminger7d836a72013-04-27 11:31:56 +00001185 uh->source = src_port;
stephen hemmingerd3428942012-10-01 12:32:35 +00001186
1187 uh->len = htons(skb->len);
1188 uh->check = 0;
1189
stephen hemminger1cad8712012-10-09 20:35:49 +00001190 vxlan_set_owner(dev, skb);
1191
Pravin B Shelar05c0db02013-03-07 13:22:36 +00001192 if (handle_offloads(skb))
1193 goto drop;
stephen hemmingerd3428942012-10-01 12:32:35 +00001194
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -07001195 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1196 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1197
1198 err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst,
1199 IPPROTO_UDP, tos, ttl, df);
1200 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1201
Stephen Hemminger4ad16932013-06-17 14:16:11 -07001202 return;
stephen hemmingerd3428942012-10-01 12:32:35 +00001203
1204drop:
1205 dev->stats.tx_dropped++;
1206 goto tx_free;
1207
1208tx_error:
1209 dev->stats.tx_errors++;
1210tx_free:
1211 dev_kfree_skb(skb);
stephen hemmingerd3428942012-10-01 12:32:35 +00001212}
1213
David Stevens66817122013-03-15 04:35:51 +00001214/* Transmit local packets over Vxlan
1215 *
1216 * Outer IP header inherits ECN and DF from inner header.
1217 * Outer UDP destination is the VXLAN assigned port.
1218 * source port is based on hash of flow
1219 */
1220static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1221{
1222 struct vxlan_dev *vxlan = netdev_priv(dev);
1223 struct ethhdr *eth;
1224 bool did_rsc = false;
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001225 struct vxlan_rdst *rdst;
David Stevens66817122013-03-15 04:35:51 +00001226 struct vxlan_fdb *f;
David Stevens66817122013-03-15 04:35:51 +00001227
1228 skb_reset_mac_header(skb);
1229 eth = eth_hdr(skb);
1230
1231 if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
1232 return arp_reduce(dev, skb);
David Stevens66817122013-03-15 04:35:51 +00001233
1234 f = vxlan_find_mac(vxlan, eth->h_dest);
David Stevensae884082013-04-19 00:36:26 +00001235 did_rsc = false;
1236
1237 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1238 ntohs(eth->h_proto) == ETH_P_IP) {
1239 did_rsc = route_shortcircuit(dev, skb);
1240 if (did_rsc)
1241 f = vxlan_find_mac(vxlan, eth->h_dest);
1242 }
1243
David Stevens66817122013-03-15 04:35:51 +00001244 if (f == NULL) {
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001245 f = vxlan_find_mac(vxlan, all_zeros_mac);
1246 if (f == NULL) {
1247 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1248 !is_multicast_ether_addr(eth->h_dest))
1249 vxlan_fdb_miss(vxlan, eth->h_dest);
David Stevens66817122013-03-15 04:35:51 +00001250
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001251 dev->stats.tx_dropped++;
1252 dev_kfree_skb(skb);
1253 return NETDEV_TX_OK;
Stephen Hemminger3e61aa82013-06-17 14:16:12 -07001254 }
David Stevens66817122013-03-15 04:35:51 +00001255 }
1256
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001257 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1258 struct sk_buff *skb1;
1259
1260 skb1 = skb_clone(skb, GFP_ATOMIC);
1261 if (skb1)
1262 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1263 }
1264
1265 dev_kfree_skb(skb);
Stephen Hemminger4ad16932013-06-17 14:16:11 -07001266 return NETDEV_TX_OK;
David Stevens66817122013-03-15 04:35:51 +00001267}
1268
stephen hemmingerd3428942012-10-01 12:32:35 +00001269/* Walk the forwarding table and purge stale entries */
1270static void vxlan_cleanup(unsigned long arg)
1271{
1272 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1273 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1274 unsigned int h;
1275
1276 if (!netif_running(vxlan->dev))
1277 return;
1278
1279 spin_lock_bh(&vxlan->hash_lock);
1280 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1281 struct hlist_node *p, *n;
1282 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1283 struct vxlan_fdb *f
1284 = container_of(p, struct vxlan_fdb, hlist);
1285 unsigned long timeout;
1286
stephen hemminger3c172862012-10-26 06:24:34 +00001287 if (f->state & NUD_PERMANENT)
stephen hemmingerd3428942012-10-01 12:32:35 +00001288 continue;
1289
1290 timeout = f->used + vxlan->age_interval * HZ;
1291 if (time_before_eq(timeout, jiffies)) {
1292 netdev_dbg(vxlan->dev,
1293 "garbage collect %pM\n",
1294 f->eth_addr);
1295 f->state = NUD_STALE;
1296 vxlan_fdb_destroy(vxlan, f);
1297 } else if (time_before(timeout, next_timer))
1298 next_timer = timeout;
1299 }
1300 }
1301 spin_unlock_bh(&vxlan->hash_lock);
1302
1303 mod_timer(&vxlan->age_timer, next_timer);
1304}
1305
1306/* Setup stats when device is created */
1307static int vxlan_init(struct net_device *dev)
1308{
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001309 struct vxlan_dev *vxlan = netdev_priv(dev);
1310 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1311 struct vxlan_sock *vs;
1312 __u32 vni = vxlan->default_dst.remote_vni;
1313
Pravin B Shelare8171042013-03-25 14:49:46 +00001314 dev->tstats = alloc_percpu(struct pcpu_tstats);
1315 if (!dev->tstats)
stephen hemmingerd3428942012-10-01 12:32:35 +00001316 return -ENOMEM;
1317
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001318 spin_lock(&vn->sock_lock);
1319 vs = vxlan_find_port(dev_net(dev), vxlan->dst_port);
1320 if (vs) {
1321 /* If we have a socket with same port already, reuse it */
1322 atomic_inc(&vs->refcnt);
1323 vxlan->vn_sock = vs;
1324 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1325 } else {
1326 /* otherwise make new socket outside of RTNL */
1327 dev_hold(dev);
1328 queue_work(vxlan_wq, &vxlan->sock_work);
1329 }
1330 spin_unlock(&vn->sock_lock);
1331
stephen hemmingerd3428942012-10-01 12:32:35 +00001332 return 0;
1333}
1334
Stephen Hemmingerba609e92013-06-25 17:06:01 -07001335static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001336{
1337 struct vxlan_fdb *f;
1338
1339 spin_lock_bh(&vxlan->hash_lock);
1340 f = __vxlan_find_mac(vxlan, all_zeros_mac);
1341 if (f)
1342 vxlan_fdb_destroy(vxlan, f);
1343 spin_unlock_bh(&vxlan->hash_lock);
1344}
1345
Stephen Hemmingerebf40632013-06-17 14:16:11 -07001346static void vxlan_uninit(struct net_device *dev)
1347{
1348 struct vxlan_dev *vxlan = netdev_priv(dev);
1349 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1350 struct vxlan_sock *vs = vxlan->vn_sock;
1351
Stephen Hemmingerba609e92013-06-25 17:06:01 -07001352 vxlan_fdb_delete_default(vxlan);
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001353
Stephen Hemmingerebf40632013-06-17 14:16:11 -07001354 if (vs)
1355 vxlan_sock_release(vn, vs);
1356 free_percpu(dev->tstats);
1357}
1358
stephen hemmingerd3428942012-10-01 12:32:35 +00001359/* Start ageing timer and join group when device is brought up */
1360static int vxlan_open(struct net_device *dev)
1361{
1362 struct vxlan_dev *vxlan = netdev_priv(dev);
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001363 struct vxlan_sock *vs = vxlan->vn_sock;
1364
1365 /* socket hasn't been created */
1366 if (!vs)
1367 return -ENOTCONN;
stephen hemmingerd3428942012-10-01 12:32:35 +00001368
Atzm Watanabec7995c42013-04-16 02:50:52 +00001369 if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001370 vxlan_sock_hold(vs);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -07001371 dev_hold(dev);
1372 queue_work(vxlan_wq, &vxlan->igmp_work);
stephen hemmingerd3428942012-10-01 12:32:35 +00001373 }
1374
1375 if (vxlan->age_interval)
1376 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1377
1378 return 0;
1379}
1380
1381/* Purge the forwarding table */
1382static void vxlan_flush(struct vxlan_dev *vxlan)
1383{
Cong Wang31fec5a2013-05-27 22:35:52 +00001384 unsigned int h;
stephen hemmingerd3428942012-10-01 12:32:35 +00001385
1386 spin_lock_bh(&vxlan->hash_lock);
1387 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1388 struct hlist_node *p, *n;
1389 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1390 struct vxlan_fdb *f
1391 = container_of(p, struct vxlan_fdb, hlist);
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001392 /* the all_zeros_mac entry is deleted at vxlan_uninit */
1393 if (!is_zero_ether_addr(f->eth_addr))
1394 vxlan_fdb_destroy(vxlan, f);
stephen hemmingerd3428942012-10-01 12:32:35 +00001395 }
1396 }
1397 spin_unlock_bh(&vxlan->hash_lock);
1398}
1399
1400/* Cleanup timer and forwarding table on shutdown */
1401static int vxlan_stop(struct net_device *dev)
1402{
1403 struct vxlan_dev *vxlan = netdev_priv(dev);
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001404 struct vxlan_sock *vs = vxlan->vn_sock;
stephen hemmingerd3428942012-10-01 12:32:35 +00001405
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001406 if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
1407 vxlan_sock_hold(vs);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -07001408 dev_hold(dev);
1409 queue_work(vxlan_wq, &vxlan->igmp_work);
1410 }
stephen hemmingerd3428942012-10-01 12:32:35 +00001411
1412 del_timer_sync(&vxlan->age_timer);
1413
1414 vxlan_flush(vxlan);
1415
1416 return 0;
1417}
1418
stephen hemmingerd3428942012-10-01 12:32:35 +00001419/* Stub, nothing needs to be done. */
1420static void vxlan_set_multicast_list(struct net_device *dev)
1421{
1422}
1423
1424static const struct net_device_ops vxlan_netdev_ops = {
1425 .ndo_init = vxlan_init,
Stephen Hemmingerebf40632013-06-17 14:16:11 -07001426 .ndo_uninit = vxlan_uninit,
stephen hemmingerd3428942012-10-01 12:32:35 +00001427 .ndo_open = vxlan_open,
1428 .ndo_stop = vxlan_stop,
1429 .ndo_start_xmit = vxlan_xmit,
Pravin B Shelare8171042013-03-25 14:49:46 +00001430 .ndo_get_stats64 = ip_tunnel_get_stats64,
stephen hemmingerd3428942012-10-01 12:32:35 +00001431 .ndo_set_rx_mode = vxlan_set_multicast_list,
1432 .ndo_change_mtu = eth_change_mtu,
1433 .ndo_validate_addr = eth_validate_addr,
1434 .ndo_set_mac_address = eth_mac_addr,
1435 .ndo_fdb_add = vxlan_fdb_add,
1436 .ndo_fdb_del = vxlan_fdb_delete,
1437 .ndo_fdb_dump = vxlan_fdb_dump,
1438};
1439
1440/* Info for udev, that this is a virtual tunnel endpoint */
1441static struct device_type vxlan_type = {
1442 .name = "vxlan",
1443};
1444
stephen hemmingerd3428942012-10-01 12:32:35 +00001445/* Initialize the device structure. */
1446static void vxlan_setup(struct net_device *dev)
1447{
1448 struct vxlan_dev *vxlan = netdev_priv(dev);
Cong Wang31fec5a2013-05-27 22:35:52 +00001449 unsigned int h;
stephen hemminger05f47d62012-10-09 20:35:50 +00001450 int low, high;
stephen hemmingerd3428942012-10-01 12:32:35 +00001451
1452 eth_hw_addr_random(dev);
1453 ether_setup(dev);
stephen hemminger2840bf22012-10-09 20:35:51 +00001454 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
stephen hemmingerd3428942012-10-01 12:32:35 +00001455
1456 dev->netdev_ops = &vxlan_netdev_ops;
Stephen Hemmingerebf40632013-06-17 14:16:11 -07001457 dev->destructor = free_netdev;
stephen hemmingerd3428942012-10-01 12:32:35 +00001458 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1459
1460 dev->tx_queue_len = 0;
1461 dev->features |= NETIF_F_LLTX;
1462 dev->features |= NETIF_F_NETNS_LOCAL;
Joseph Gasparakisd6727fe2012-12-07 14:14:16 +00001463 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
Joseph Gasparakis0afb1662012-12-07 14:14:18 +00001464 dev->features |= NETIF_F_RXCSUM;
Pravin B Shelar05c0db02013-03-07 13:22:36 +00001465 dev->features |= NETIF_F_GSO_SOFTWARE;
Joseph Gasparakis0afb1662012-12-07 14:14:18 +00001466
1467 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
Pravin B Shelar05c0db02013-03-07 13:22:36 +00001468 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
stephen hemmingerd3428942012-10-01 12:32:35 +00001469 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
stephen hemminger6602d002012-12-31 12:00:21 +00001470 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
stephen hemmingerd3428942012-10-01 12:32:35 +00001471
stephen hemminger553675f2013-05-16 11:35:20 +00001472 INIT_LIST_HEAD(&vxlan->next);
stephen hemmingerd3428942012-10-01 12:32:35 +00001473 spin_lock_init(&vxlan->hash_lock);
Stephen Hemminger7c47ced2013-06-17 14:16:10 -07001474 INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work);
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001475 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
stephen hemmingerd3428942012-10-01 12:32:35 +00001476
1477 init_timer_deferrable(&vxlan->age_timer);
1478 vxlan->age_timer.function = vxlan_cleanup;
1479 vxlan->age_timer.data = (unsigned long) vxlan;
1480
stephen hemminger05f47d62012-10-09 20:35:50 +00001481 inet_get_local_port_range(&low, &high);
1482 vxlan->port_min = low;
1483 vxlan->port_max = high;
stephen hemminger823aa872013-04-27 11:31:57 +00001484 vxlan->dst_port = htons(vxlan_port);
stephen hemminger05f47d62012-10-09 20:35:50 +00001485
stephen hemmingerd3428942012-10-01 12:32:35 +00001486 vxlan->dev = dev;
1487
1488 for (h = 0; h < FDB_HASH_SIZE; ++h)
1489 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1490}
1491
1492static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1493 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
stephen hemminger5d174dd2013-04-27 11:31:55 +00001494 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
stephen hemmingerd3428942012-10-01 12:32:35 +00001495 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1496 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1497 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1498 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1499 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1500 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1501 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
stephen hemminger05f47d62012-10-09 20:35:50 +00001502 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
David Stevense4f67ad2012-11-20 02:50:14 +00001503 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
1504 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
1505 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
1506 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
stephen hemminger823aa872013-04-27 11:31:57 +00001507 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
stephen hemmingerd3428942012-10-01 12:32:35 +00001508};
1509
1510static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1511{
1512 if (tb[IFLA_ADDRESS]) {
1513 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1514 pr_debug("invalid link address (not ethernet)\n");
1515 return -EINVAL;
1516 }
1517
1518 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1519 pr_debug("invalid all zero ethernet address\n");
1520 return -EADDRNOTAVAIL;
1521 }
1522 }
1523
1524 if (!data)
1525 return -EINVAL;
1526
1527 if (data[IFLA_VXLAN_ID]) {
1528 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1529 if (id >= VXLAN_VID_MASK)
1530 return -ERANGE;
1531 }
1532
stephen hemminger05f47d62012-10-09 20:35:50 +00001533 if (data[IFLA_VXLAN_PORT_RANGE]) {
1534 const struct ifla_vxlan_port_range *p
1535 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1536
1537 if (ntohs(p->high) < ntohs(p->low)) {
1538 pr_debug("port range %u .. %u not valid\n",
1539 ntohs(p->low), ntohs(p->high));
1540 return -EINVAL;
1541 }
1542 }
1543
stephen hemmingerd3428942012-10-01 12:32:35 +00001544 return 0;
1545}
1546
Yan Burman1b13c972013-01-29 23:43:07 +00001547static void vxlan_get_drvinfo(struct net_device *netdev,
1548 struct ethtool_drvinfo *drvinfo)
1549{
1550 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
1551 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
1552}
1553
1554static const struct ethtool_ops vxlan_ethtool_ops = {
1555 .get_drvinfo = vxlan_get_drvinfo,
1556 .get_link = ethtool_op_get_link,
1557};
1558
stephen hemminger553675f2013-05-16 11:35:20 +00001559static void vxlan_del_work(struct work_struct *work)
1560{
1561 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
1562
1563 sk_release_kernel(vs->sock->sk);
1564 kfree_rcu(vs, rcu);
1565}
1566
stephen hemminger553675f2013-05-16 11:35:20 +00001567static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
1568{
1569 struct vxlan_sock *vs;
1570 struct sock *sk;
1571 struct sockaddr_in vxlan_addr = {
1572 .sin_family = AF_INET,
1573 .sin_addr.s_addr = htonl(INADDR_ANY),
Stephen Hemmingerbb3fd682013-06-17 14:16:40 -07001574 .sin_port = port,
stephen hemminger553675f2013-05-16 11:35:20 +00001575 };
1576 int rc;
Cong Wang31fec5a2013-05-27 22:35:52 +00001577 unsigned int h;
stephen hemminger553675f2013-05-16 11:35:20 +00001578
1579 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
1580 if (!vs)
1581 return ERR_PTR(-ENOMEM);
1582
1583 for (h = 0; h < VNI_HASH_SIZE; ++h)
1584 INIT_HLIST_HEAD(&vs->vni_list[h]);
1585
1586 INIT_WORK(&vs->del_work, vxlan_del_work);
1587
1588 /* Create UDP socket for encapsulation receive. */
1589 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
1590 if (rc < 0) {
1591 pr_debug("UDP socket create failed\n");
1592 kfree(vs);
1593 return ERR_PTR(rc);
1594 }
1595
1596 /* Put in proper namespace */
1597 sk = vs->sock->sk;
1598 sk_change_net(sk, net);
1599
stephen hemminger553675f2013-05-16 11:35:20 +00001600 rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
1601 sizeof(vxlan_addr));
1602 if (rc < 0) {
1603 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1604 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1605 sk_release_kernel(sk);
1606 kfree(vs);
1607 return ERR_PTR(rc);
1608 }
1609
1610 /* Disable multicast loopback */
1611 inet_sk(sk)->mc_loop = 0;
1612
1613 /* Mark socket as an encapsulation socket. */
1614 udp_sk(sk)->encap_type = 1;
1615 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1616 udp_encap_enable();
Stephen Hemminger7c47ced2013-06-17 14:16:10 -07001617 atomic_set(&vs->refcnt, 1);
stephen hemminger553675f2013-05-16 11:35:20 +00001618
stephen hemminger553675f2013-05-16 11:35:20 +00001619 return vs;
1620}
1621
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001622/* Scheduled at device creation to bind to a socket */
1623static void vxlan_sock_work(struct work_struct *work)
1624{
1625 struct vxlan_dev *vxlan
1626 = container_of(work, struct vxlan_dev, sock_work);
1627 struct net_device *dev = vxlan->dev;
1628 struct net *net = dev_net(dev);
1629 __u32 vni = vxlan->default_dst.remote_vni;
1630 __be16 port = vxlan->dst_port;
1631 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1632 struct vxlan_sock *nvs, *ovs;
1633
1634 nvs = vxlan_socket_create(net, port);
1635 if (IS_ERR(nvs)) {
1636 netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n",
1637 PTR_ERR(nvs));
1638 goto out;
1639 }
1640
1641 spin_lock(&vn->sock_lock);
1642 /* Look again to see if can reuse socket */
1643 ovs = vxlan_find_port(net, port);
1644 if (ovs) {
1645 atomic_inc(&ovs->refcnt);
1646 vxlan->vn_sock = ovs;
1647 hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni));
1648 spin_unlock(&vn->sock_lock);
1649
1650 sk_release_kernel(nvs->sock->sk);
1651 kfree(nvs);
1652 } else {
1653 vxlan->vn_sock = nvs;
1654 hlist_add_head_rcu(&nvs->hlist, vs_head(net, port));
1655 hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni));
1656 spin_unlock(&vn->sock_lock);
1657 }
1658out:
1659 dev_put(dev);
1660}
1661
stephen hemmingerd3428942012-10-01 12:32:35 +00001662static int vxlan_newlink(struct net *net, struct net_device *dev,
1663 struct nlattr *tb[], struct nlattr *data[])
1664{
stephen hemminger553675f2013-05-16 11:35:20 +00001665 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
stephen hemmingerd3428942012-10-01 12:32:35 +00001666 struct vxlan_dev *vxlan = netdev_priv(dev);
Atzm Watanabec7995c42013-04-16 02:50:52 +00001667 struct vxlan_rdst *dst = &vxlan->default_dst;
stephen hemmingerd3428942012-10-01 12:32:35 +00001668 __u32 vni;
1669 int err;
1670
1671 if (!data[IFLA_VXLAN_ID])
1672 return -EINVAL;
1673
1674 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
Atzm Watanabec7995c42013-04-16 02:50:52 +00001675 dst->remote_vni = vni;
stephen hemmingerd3428942012-10-01 12:32:35 +00001676
stephen hemminger5d174dd2013-04-27 11:31:55 +00001677 if (data[IFLA_VXLAN_GROUP])
1678 dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]);
stephen hemmingerd3428942012-10-01 12:32:35 +00001679
1680 if (data[IFLA_VXLAN_LOCAL])
1681 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1682
stephen hemminger34e02aa2012-10-09 20:35:53 +00001683 if (data[IFLA_VXLAN_LINK] &&
Atzm Watanabec7995c42013-04-16 02:50:52 +00001684 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
stephen hemminger34e02aa2012-10-09 20:35:53 +00001685 struct net_device *lowerdev
Atzm Watanabec7995c42013-04-16 02:50:52 +00001686 = __dev_get_by_index(net, dst->remote_ifindex);
stephen hemmingerd3428942012-10-01 12:32:35 +00001687
stephen hemminger34e02aa2012-10-09 20:35:53 +00001688 if (!lowerdev) {
Atzm Watanabec7995c42013-04-16 02:50:52 +00001689 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
stephen hemminger34e02aa2012-10-09 20:35:53 +00001690 return -ENODEV;
stephen hemmingerd3428942012-10-01 12:32:35 +00001691 }
stephen hemminger34e02aa2012-10-09 20:35:53 +00001692
1693 if (!tb[IFLA_MTU])
1694 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
Alexander Duyck1ba56fb2012-11-13 13:10:59 +00001695
1696 /* update header length based on lower device */
1697 dev->hard_header_len = lowerdev->hard_header_len +
1698 VXLAN_HEADROOM;
stephen hemmingerd3428942012-10-01 12:32:35 +00001699 }
1700
1701 if (data[IFLA_VXLAN_TOS])
1702 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1703
Vincent Bernatafb97182012-10-30 10:27:16 +00001704 if (data[IFLA_VXLAN_TTL])
1705 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1706
stephen hemmingerd3428942012-10-01 12:32:35 +00001707 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
David Stevense4f67ad2012-11-20 02:50:14 +00001708 vxlan->flags |= VXLAN_F_LEARN;
stephen hemmingerd3428942012-10-01 12:32:35 +00001709
1710 if (data[IFLA_VXLAN_AGEING])
1711 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1712 else
1713 vxlan->age_interval = FDB_AGE_DEFAULT;
1714
David Stevense4f67ad2012-11-20 02:50:14 +00001715 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1716 vxlan->flags |= VXLAN_F_PROXY;
1717
1718 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1719 vxlan->flags |= VXLAN_F_RSC;
1720
1721 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1722 vxlan->flags |= VXLAN_F_L2MISS;
1723
1724 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1725 vxlan->flags |= VXLAN_F_L3MISS;
1726
stephen hemmingerd3428942012-10-01 12:32:35 +00001727 if (data[IFLA_VXLAN_LIMIT])
1728 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1729
stephen hemminger05f47d62012-10-09 20:35:50 +00001730 if (data[IFLA_VXLAN_PORT_RANGE]) {
1731 const struct ifla_vxlan_port_range *p
1732 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1733 vxlan->port_min = ntohs(p->low);
1734 vxlan->port_max = ntohs(p->high);
1735 }
1736
stephen hemminger823aa872013-04-27 11:31:57 +00001737 if (data[IFLA_VXLAN_PORT])
1738 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
1739
stephen hemminger553675f2013-05-16 11:35:20 +00001740 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
1741 pr_info("duplicate VNI %u\n", vni);
1742 return -EEXIST;
1743 }
1744
Yan Burman1b13c972013-01-29 23:43:07 +00001745 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
1746
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001747 /* create an fdb entry for default destination */
1748 err = vxlan_fdb_create(vxlan, all_zeros_mac,
1749 vxlan->default_dst.remote_ip,
1750 NUD_REACHABLE|NUD_PERMANENT,
1751 NLM_F_EXCL|NLM_F_CREATE,
1752 vxlan->dst_port, vxlan->default_dst.remote_vni,
1753 vxlan->default_dst.remote_ifindex, NTF_SELF);
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001754 if (err)
stephen hemminger553675f2013-05-16 11:35:20 +00001755 return err;
stephen hemmingerd3428942012-10-01 12:32:35 +00001756
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001757 err = register_netdevice(dev);
1758 if (err) {
Stephen Hemmingerba609e92013-06-25 17:06:01 -07001759 vxlan_fdb_delete_default(vxlan);
Mike Rapoportafbd8ba2013-06-25 16:01:51 +03001760 return err;
1761 }
1762
stephen hemminger553675f2013-05-16 11:35:20 +00001763 list_add(&vxlan->next, &vn->vxlan_list);
stephen hemminger553675f2013-05-16 11:35:20 +00001764
1765 return 0;
stephen hemmingerd3428942012-10-01 12:32:35 +00001766}
1767
1768static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1769{
stephen hemmingerfe5c3562013-07-13 10:18:18 -07001770 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
stephen hemmingerd3428942012-10-01 12:32:35 +00001771 struct vxlan_dev *vxlan = netdev_priv(dev);
1772
stephen hemmingerfe5c3562013-07-13 10:18:18 -07001773 flush_workqueue(vxlan_wq);
1774
1775 spin_lock(&vn->sock_lock);
stephen hemmingerd3428942012-10-01 12:32:35 +00001776 hlist_del_rcu(&vxlan->hlist);
stephen hemmingerfe5c3562013-07-13 10:18:18 -07001777 spin_unlock(&vn->sock_lock);
1778
stephen hemminger553675f2013-05-16 11:35:20 +00001779 list_del(&vxlan->next);
stephen hemmingerd3428942012-10-01 12:32:35 +00001780 unregister_netdevice_queue(dev, head);
1781}
1782
1783static size_t vxlan_get_size(const struct net_device *dev)
1784{
1785
1786 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
stephen hemminger5d174dd2013-04-27 11:31:55 +00001787 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
stephen hemmingerd3428942012-10-01 12:32:35 +00001788 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1789 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1790 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1791 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1792 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
David Stevense4f67ad2012-11-20 02:50:14 +00001793 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
1794 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
1795 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
1796 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
stephen hemmingerd3428942012-10-01 12:32:35 +00001797 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1798 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
stephen hemminger05f47d62012-10-09 20:35:50 +00001799 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
stephen hemminger823aa872013-04-27 11:31:57 +00001800 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
stephen hemmingerd3428942012-10-01 12:32:35 +00001801 0;
1802}
1803
1804static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1805{
1806 const struct vxlan_dev *vxlan = netdev_priv(dev);
Atzm Watanabec7995c42013-04-16 02:50:52 +00001807 const struct vxlan_rdst *dst = &vxlan->default_dst;
stephen hemminger05f47d62012-10-09 20:35:50 +00001808 struct ifla_vxlan_port_range ports = {
1809 .low = htons(vxlan->port_min),
1810 .high = htons(vxlan->port_max),
1811 };
stephen hemmingerd3428942012-10-01 12:32:35 +00001812
Atzm Watanabec7995c42013-04-16 02:50:52 +00001813 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
stephen hemmingerd3428942012-10-01 12:32:35 +00001814 goto nla_put_failure;
1815
stephen hemminger5d174dd2013-04-27 11:31:55 +00001816 if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip))
stephen hemmingerd3428942012-10-01 12:32:35 +00001817 goto nla_put_failure;
1818
Atzm Watanabec7995c42013-04-16 02:50:52 +00001819 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
stephen hemmingerd3428942012-10-01 12:32:35 +00001820 goto nla_put_failure;
1821
Stephen Hemminger7c41c422012-10-08 14:55:30 -07001822 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
stephen hemmingerd3428942012-10-01 12:32:35 +00001823 goto nla_put_failure;
1824
1825 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1826 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
David Stevense4f67ad2012-11-20 02:50:14 +00001827 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1828 !!(vxlan->flags & VXLAN_F_LEARN)) ||
1829 nla_put_u8(skb, IFLA_VXLAN_PROXY,
1830 !!(vxlan->flags & VXLAN_F_PROXY)) ||
1831 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1832 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1833 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1834 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1835 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
stephen hemmingerd3428942012-10-01 12:32:35 +00001836 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
stephen hemminger823aa872013-04-27 11:31:57 +00001837 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
1838 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
stephen hemmingerd3428942012-10-01 12:32:35 +00001839 goto nla_put_failure;
1840
stephen hemminger05f47d62012-10-09 20:35:50 +00001841 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1842 goto nla_put_failure;
1843
stephen hemmingerd3428942012-10-01 12:32:35 +00001844 return 0;
1845
1846nla_put_failure:
1847 return -EMSGSIZE;
1848}
1849
1850static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1851 .kind = "vxlan",
1852 .maxtype = IFLA_VXLAN_MAX,
1853 .policy = vxlan_policy,
1854 .priv_size = sizeof(struct vxlan_dev),
1855 .setup = vxlan_setup,
1856 .validate = vxlan_validate,
1857 .newlink = vxlan_newlink,
1858 .dellink = vxlan_dellink,
1859 .get_size = vxlan_get_size,
1860 .fill_info = vxlan_fill_info,
1861};
1862
1863static __net_init int vxlan_init_net(struct net *net)
1864{
1865 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
Cong Wang31fec5a2013-05-27 22:35:52 +00001866 unsigned int h;
stephen hemmingerd3428942012-10-01 12:32:35 +00001867
stephen hemminger553675f2013-05-16 11:35:20 +00001868 INIT_LIST_HEAD(&vn->vxlan_list);
Stephen Hemminger1c51a912013-06-17 14:16:11 -07001869 spin_lock_init(&vn->sock_lock);
stephen hemmingerd3428942012-10-01 12:32:35 +00001870
stephen hemminger553675f2013-05-16 11:35:20 +00001871 for (h = 0; h < PORT_HASH_SIZE; ++h)
1872 INIT_HLIST_HEAD(&vn->sock_list[h]);
stephen hemmingerd3428942012-10-01 12:32:35 +00001873
1874 return 0;
1875}
1876
1877static __net_exit void vxlan_exit_net(struct net *net)
1878{
1879 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
Zang MingJie9cb6cb72013-03-06 04:37:37 +00001880 struct vxlan_dev *vxlan;
Zang MingJie9cb6cb72013-03-06 04:37:37 +00001881
1882 rtnl_lock();
stephen hemminger553675f2013-05-16 11:35:20 +00001883 list_for_each_entry(vxlan, &vn->vxlan_list, next)
1884 dev_close(vxlan->dev);
Zang MingJie9cb6cb72013-03-06 04:37:37 +00001885 rtnl_unlock();
stephen hemmingerd3428942012-10-01 12:32:35 +00001886}
1887
1888static struct pernet_operations vxlan_net_ops = {
1889 .init = vxlan_init_net,
1890 .exit = vxlan_exit_net,
1891 .id = &vxlan_net_id,
1892 .size = sizeof(struct vxlan_net),
1893};
1894
1895static int __init vxlan_init_module(void)
1896{
1897 int rc;
1898
Stephen Hemminger758c57d2013-06-17 14:16:09 -07001899 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
1900 if (!vxlan_wq)
1901 return -ENOMEM;
1902
stephen hemmingerd3428942012-10-01 12:32:35 +00001903 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1904
1905 rc = register_pernet_device(&vxlan_net_ops);
1906 if (rc)
1907 goto out1;
1908
1909 rc = rtnl_link_register(&vxlan_link_ops);
1910 if (rc)
1911 goto out2;
1912
1913 return 0;
1914
1915out2:
1916 unregister_pernet_device(&vxlan_net_ops);
1917out1:
Stephen Hemminger758c57d2013-06-17 14:16:09 -07001918 destroy_workqueue(vxlan_wq);
stephen hemmingerd3428942012-10-01 12:32:35 +00001919 return rc;
1920}
Cong Wang7332a132013-05-27 22:35:53 +00001921late_initcall(vxlan_init_module);
stephen hemmingerd3428942012-10-01 12:32:35 +00001922
1923static void __exit vxlan_cleanup_module(void)
1924{
Stephen Hemmingerb7153982013-06-17 14:16:09 -07001925 rtnl_link_unregister(&vxlan_link_ops);
Stephen Hemminger758c57d2013-06-17 14:16:09 -07001926 destroy_workqueue(vxlan_wq);
Pravin B Shelarf89e57c2013-07-11 11:38:06 -07001927 unregister_pernet_device(&vxlan_net_ops);
David Stevens66817122013-03-15 04:35:51 +00001928 rcu_barrier();
stephen hemmingerd3428942012-10-01 12:32:35 +00001929}
1930module_exit(vxlan_cleanup_module);
1931
1932MODULE_LICENSE("GPL");
1933MODULE_VERSION(VXLAN_VERSION);
stephen hemminger3b8df3c2013-04-27 11:31:52 +00001934MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
stephen hemmingerd3428942012-10-01 12:32:35 +00001935MODULE_ALIAS_RTNL_LINK("vxlan");