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Pravin B Shelar012a5722013-08-19 11:23:07 -07001#ifndef __NET_VXLAN_H
2#define __NET_VXLAN_H 1
3
Jesse Gross5f352272014-12-23 22:37:26 -08004#include <linux/ip.h>
5#include <linux/ipv6.h>
6#include <linux/if_vlan.h>
Pravin B Shelar012a5722013-08-19 11:23:07 -07007#include <linux/skbuff.h>
8#include <linux/netdevice.h>
9#include <linux/udp.h>
Thomas Grafee122c72015-07-21 10:43:58 +020010#include <net/dst_metadata.h>
Pravin B Shelar012a5722013-08-19 11:23:07 -070011
Jiri Benc828788a2016-02-02 18:09:13 +010012/* VXLAN protocol (RFC 7348) header:
Thomas Graf35114942015-01-15 03:53:55 +010013 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Jiri Benc828788a2016-02-02 18:09:13 +010014 * |R|R|R|R|I|R|R|R| Reserved |
Thomas Graf35114942015-01-15 03:53:55 +010015 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
16 * | VXLAN Network Identifier (VNI) | Reserved |
17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
18 *
Jiri Benc828788a2016-02-02 18:09:13 +010019 * I = VXLAN Network Identifier (VNI) present.
20 */
21struct vxlanhdr {
22 __be32 vx_flags;
23 __be32 vx_vni;
24};
25
26/* VXLAN header flags. */
Jiri Benc54bfd872016-02-16 21:58:58 +010027#define VXLAN_HF_VNI cpu_to_be32(BIT(27))
Jiri Benc828788a2016-02-02 18:09:13 +010028
29#define VXLAN_N_VID (1u << 24)
30#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
Jiri Benc54bfd872016-02-16 21:58:58 +010031#define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8)
Jiri Benc828788a2016-02-02 18:09:13 +010032#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
33
34#define VNI_HASH_BITS 10
35#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
36#define FDB_HASH_BITS 8
37#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
38
39/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * |R|R|R|R|I|R|R|R|R|R|C| Reserved |
42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
43 * | VXLAN Network Identifier (VNI) |O| Csum start |
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 *
46 * C = Remote checksum offload bit. When set indicates that the
47 * remote checksum offload data is present.
48 *
49 * O = Offset bit. Indicates the checksum offset relative to
50 * checksum start.
51 *
52 * Csum start = Checksum start divided by two.
53 *
54 * http://tools.ietf.org/html/draft-herbert-vxlan-rco
55 */
56
57/* VXLAN-RCO header flags. */
Jiri Benc54bfd872016-02-16 21:58:58 +010058#define VXLAN_HF_RCO cpu_to_be32(BIT(21))
Jiri Benc828788a2016-02-02 18:09:13 +010059
60/* Remote checksum offload header option */
Jiri Benc54bfd872016-02-16 21:58:58 +010061#define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */
62#define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */
63#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
Jiri Benc828788a2016-02-02 18:09:13 +010064#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
Jiri Benc54bfd872016-02-16 21:58:58 +010065#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
Jiri Benc828788a2016-02-02 18:09:13 +010066
67/*
68 * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
70 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * | VXLAN Network Identifier (VNI) | Reserved |
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 *
75 * G = Group Policy ID present.
76 *
Thomas Graf35114942015-01-15 03:53:55 +010077 * D = Don't Learn bit. When set, this bit indicates that the egress
78 * VTEP MUST NOT learn the source address of the encapsulated frame.
79 *
80 * A = Indicates that the group policy has already been applied to
81 * this packet. Policies MUST NOT be applied by devices when the
82 * A bit is set.
83 *
Jiri Benc828788a2016-02-02 18:09:13 +010084 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
Thomas Graf35114942015-01-15 03:53:55 +010085 */
86struct vxlanhdr_gbp {
Jiri Benc0e715d62016-02-02 18:09:11 +010087 u8 vx_flags;
Thomas Graf35114942015-01-15 03:53:55 +010088#ifdef __LITTLE_ENDIAN_BITFIELD
Jiri Benc0e715d62016-02-02 18:09:11 +010089 u8 reserved_flags1:3,
Thomas Graf35114942015-01-15 03:53:55 +010090 policy_applied:1,
91 reserved_flags2:2,
92 dont_learn:1,
93 reserved_flags3:1;
94#elif defined(__BIG_ENDIAN_BITFIELD)
Jiri Benc0e715d62016-02-02 18:09:11 +010095 u8 reserved_flags1:1,
Thomas Graf35114942015-01-15 03:53:55 +010096 dont_learn:1,
97 reserved_flags2:2,
98 policy_applied:1,
99 reserved_flags3:3;
100#else
101#error "Please fix <asm/byteorder.h>"
102#endif
103 __be16 policy_id;
104 __be32 vx_vni;
105};
106
Jiri Benc828788a2016-02-02 18:09:13 +0100107/* VXLAN-GBP header flags. */
Jiri Benc54bfd872016-02-16 21:58:58 +0100108#define VXLAN_HF_GBP cpu_to_be32(BIT(31))
Jiri Benc828788a2016-02-02 18:09:13 +0100109
Jiri Benc54bfd872016-02-16 21:58:58 +0100110#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
Thomas Graf35114942015-01-15 03:53:55 +0100111
112/* skb->mark mapping
113 *
114 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
116 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 */
118#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
119#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
120#define VXLAN_GBP_ID_MASK (0xFFFF)
121
Thomas Graf35114942015-01-15 03:53:55 +0100122struct vxlan_metadata {
Thomas Graf35114942015-01-15 03:53:55 +0100123 u32 gbp;
124};
125
Pravin B Shelar012a5722013-08-19 11:23:07 -0700126/* per UDP socket information */
127struct vxlan_sock {
128 struct hlist_node hlist;
Pravin B Shelar012a5722013-08-19 11:23:07 -0700129 struct work_struct del_work;
130 struct socket *sock;
131 struct rcu_head rcu;
132 struct hlist_head vni_list[VNI_HASH_SIZE];
133 atomic_t refcnt;
Or Gerlitzdc01e7d2014-01-20 13:59:21 +0200134 struct udp_offload udp_offloads;
Tom Herbertdfd86452015-01-12 17:00:38 -0800135 u32 flags;
Pravin B Shelar012a5722013-08-19 11:23:07 -0700136};
137
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200138union vxlan_addr {
139 struct sockaddr_in sin;
140 struct sockaddr_in6 sin6;
141 struct sockaddr sa;
142};
143
144struct vxlan_rdst {
145 union vxlan_addr remote_ip;
146 __be16 remote_port;
Jiri Benc54bfd872016-02-16 21:58:58 +0100147 __be32 remote_vni;
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200148 u32 remote_ifindex;
149 struct list_head list;
150 struct rcu_head rcu;
Paolo Abeni0c1d70a2016-02-12 15:43:56 +0100151 struct dst_cache dst_cache;
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200152};
153
154struct vxlan_config {
155 union vxlan_addr remote_ip;
156 union vxlan_addr saddr;
Jiri Benc54bfd872016-02-16 21:58:58 +0100157 __be32 vni;
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200158 int remote_ifindex;
159 int mtu;
160 __be16 dst_port;
Jiri Benc0e715d62016-02-02 18:09:11 +0100161 u16 port_min;
162 u16 port_max;
163 u8 tos;
164 u8 ttl;
Daniel Borkmanne7f70af2016-03-09 03:00:03 +0100165 __be32 label;
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200166 u32 flags;
167 unsigned long age_interval;
168 unsigned int addrmax;
169 bool no_share;
170};
171
172/* Pseudo network device */
173struct vxlan_dev {
174 struct hlist_node hlist; /* vni hash table */
175 struct list_head next; /* vxlan's per namespace list */
Jiri Bencb1be00a2015-09-24 13:50:02 +0200176 struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */
177#if IS_ENABLED(CONFIG_IPV6)
178 struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */
179#endif
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200180 struct net_device *dev;
181 struct net *net; /* netns for packet i/o */
182 struct vxlan_rdst default_dst; /* default destination */
183 u32 flags; /* VXLAN_F_* in vxlan.h */
184
185 struct timer_list age_timer;
186 spinlock_t hash_lock;
187 unsigned int addrcnt;
Tom Herbert58ce31c2015-08-19 17:07:33 -0700188 struct gro_cells gro_cells;
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200189
190 struct vxlan_config cfg;
191
192 struct hlist_head fdb_head[FDB_HASH_SIZE];
193};
194
Tom Herbert359a0ea2014-06-04 17:20:29 -0700195#define VXLAN_F_LEARN 0x01
196#define VXLAN_F_PROXY 0x02
197#define VXLAN_F_RSC 0x04
198#define VXLAN_F_L2MISS 0x08
199#define VXLAN_F_L3MISS 0x10
200#define VXLAN_F_IPV6 0x20
Alexander Duyck6ceb31c2016-02-19 11:26:31 -0800201#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
Tom Herbert359a0ea2014-06-04 17:20:29 -0700202#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
203#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
Tom Herbertdfd86452015-01-12 17:00:38 -0800204#define VXLAN_F_REMCSUM_TX 0x200
205#define VXLAN_F_REMCSUM_RX 0x400
Thomas Graf35114942015-01-15 03:53:55 +0100206#define VXLAN_F_GBP 0x800
Tom Herbert0ace2ca2015-02-10 16:30:32 -0800207#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
Thomas Grafee122c72015-07-21 10:43:58 +0200208#define VXLAN_F_COLLECT_METADATA 0x2000
Tom Herbert359a0ea2014-06-04 17:20:29 -0700209
Simon Hormand299ce12015-03-12 11:00:10 +0900210/* Flags that are used in the receive path. These flags must match in
Tom Herbertaf33c1a2015-01-20 11:23:05 -0800211 * order for a socket to be shareable
212 */
213#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
214 VXLAN_F_UDP_ZERO_CSUM6_RX | \
Tom Herbert0ace2ca2015-02-10 16:30:32 -0800215 VXLAN_F_REMCSUM_RX | \
Thomas Grafee122c72015-07-21 10:43:58 +0200216 VXLAN_F_REMCSUM_NOPARTIAL | \
Alexei Starovoitovda8b43c2015-08-04 22:51:07 -0700217 VXLAN_F_COLLECT_METADATA)
Thomas Grafac5132d2015-01-15 03:53:56 +0100218
Thomas Graf0dfbdf42015-07-21 10:44:02 +0200219struct net_device *vxlan_dev_create(struct net *net, const char *name,
220 u8 name_assign_type, struct vxlan_config *conf);
221
Jiri Bencb1be00a2015-09-24 13:50:02 +0200222static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan,
223 unsigned short family)
Thomas Graf614732e2015-07-21 10:44:06 +0200224{
Jiri Bencb1be00a2015-09-24 13:50:02 +0200225#if IS_ENABLED(CONFIG_IPV6)
226 if (family == AF_INET6)
227 return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport;
228#endif
229 return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport;
Thomas Graf614732e2015-07-21 10:44:06 +0200230}
Pravin B Shelar49560532013-08-19 11:23:17 -0700231
Jesse Gross5f352272014-12-23 22:37:26 -0800232static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
233 netdev_features_t features)
Joe Stringer11bf7822014-11-17 16:24:54 -0800234{
Jesse Gross5f352272014-12-23 22:37:26 -0800235 u8 l4_hdr = 0;
236
237 if (!skb->encapsulation)
238 return features;
239
240 switch (vlan_get_protocol(skb)) {
241 case htons(ETH_P_IP):
242 l4_hdr = ip_hdr(skb)->protocol;
243 break;
244 case htons(ETH_P_IPV6):
245 l4_hdr = ipv6_hdr(skb)->nexthdr;
246 break;
247 default:
248 return features;;
249 }
250
251 if ((l4_hdr == IPPROTO_UDP) &&
Joe Stringer11bf7822014-11-17 16:24:54 -0800252 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
253 skb->inner_protocol != htons(ETH_P_TEB) ||
254 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
255 sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
Tom Herberta1882222015-12-14 11:19:43 -0800256 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
Joe Stringer11bf7822014-11-17 16:24:54 -0800257
Jesse Gross5f352272014-12-23 22:37:26 -0800258 return features;
Joe Stringer11bf7822014-11-17 16:24:54 -0800259}
Joe Stringer23e62de2014-11-13 16:38:12 -0800260
Joseph Gasparakise6cd9882013-10-24 06:27:10 +0000261/* IP header + UDP + VXLAN + Ethernet header */
262#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
263/* IPv6 header + UDP + VXLAN + Ethernet header */
264#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
265
Jiri Bencd4ac05f2016-02-16 21:58:57 +0100266static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
267{
268 return (struct vxlanhdr *)(udp_hdr(skb) + 1);
269}
270
Jiri Benc54bfd872016-02-16 21:58:58 +0100271static inline __be32 vxlan_vni(__be32 vni_field)
272{
273#if defined(__BIG_ENDIAN)
Jiri Benc5692d7e2016-03-21 17:39:18 +0100274 return (__force __be32)((__force u32)vni_field >> 8);
Jiri Benc54bfd872016-02-16 21:58:58 +0100275#else
Jiri Benc5692d7e2016-03-21 17:39:18 +0100276 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
Jiri Benc54bfd872016-02-16 21:58:58 +0100277#endif
278}
279
280static inline __be32 vxlan_vni_field(__be32 vni)
281{
282#if defined(__BIG_ENDIAN)
Jiri Benc5692d7e2016-03-21 17:39:18 +0100283 return (__force __be32)((__force u32)vni << 8);
Jiri Benc54bfd872016-02-16 21:58:58 +0100284#else
Jiri Benc5692d7e2016-03-21 17:39:18 +0100285 return (__force __be32)((__force u32)vni >> 8);
Jiri Benc54bfd872016-02-16 21:58:58 +0100286#endif
287}
288
289static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id)
290{
291#if defined(__BIG_ENDIAN)
Jiri Benc5692d7e2016-03-21 17:39:18 +0100292 return (__force __be32)tun_id;
Jiri Benc54bfd872016-02-16 21:58:58 +0100293#else
Jiri Benc5692d7e2016-03-21 17:39:18 +0100294 return (__force __be32)((__force u64)tun_id >> 32);
Jiri Benc54bfd872016-02-16 21:58:58 +0100295#endif
296}
297
Jiri Benc07dabf22016-02-18 19:19:29 +0100298static inline __be64 vxlan_vni_to_tun_id(__be32 vni)
299{
300#if defined(__BIG_ENDIAN)
Jiri Benc5692d7e2016-03-21 17:39:18 +0100301 return (__force __be64)vni;
Jiri Benc07dabf22016-02-18 19:19:29 +0100302#else
Jiri Benc5692d7e2016-03-21 17:39:18 +0100303 return (__force __be64)((u64)(__force u32)vni << 32);
Jiri Benc07dabf22016-02-18 19:19:29 +0100304#endif
305}
306
Jiri Benc54bfd872016-02-16 21:58:58 +0100307static inline size_t vxlan_rco_start(__be32 vni_field)
308{
309 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
310}
311
312static inline size_t vxlan_rco_offset(__be32 vni_field)
313{
314 return (vni_field & VXLAN_RCO_UDP) ?
315 offsetof(struct udphdr, check) :
316 offsetof(struct tcphdr, check);
317}
318
319static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
320{
321 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
322
323 if (offset == offsetof(struct udphdr, check))
324 vni_field |= VXLAN_RCO_UDP;
325 return vni_field;
326}
327
Joseph Gasparakise6cd9882013-10-24 06:27:10 +0000328#if IS_ENABLED(CONFIG_VXLAN)
Joseph Gasparakis53cf52752013-09-04 02:13:38 -0700329void vxlan_get_rx_port(struct net_device *netdev);
Joseph Gasparakise6cd9882013-10-24 06:27:10 +0000330#else
331static inline void vxlan_get_rx_port(struct net_device *netdev)
332{
333}
334#endif
Jiri Benc705cc622015-08-20 13:56:28 +0200335
336static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
337{
338 return vs->sock->sk->sk_family;
339}
Jiri Benc48e92c42015-08-25 18:36:50 +0200340
341#endif