Commit | Line | Data |
---|---|---|
012a5729 PS |
1 | #ifndef __NET_VXLAN_H |
2 | #define __NET_VXLAN_H 1 | |
3 | ||
5f35227e JG |
4 | #include <linux/ip.h> |
5 | #include <linux/ipv6.h> | |
6 | #include <linux/if_vlan.h> | |
012a5729 PS |
7 | #include <linux/skbuff.h> |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/udp.h> | |
ee122c79 | 10 | #include <net/dst_metadata.h> |
012a5729 | 11 | |
828788ac JB |
12 | /* VXLAN protocol (RFC 7348) header: |
13 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
14 | * |R|R|R|R|I|R|R|R| Reserved | | |
15 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
16 | * | VXLAN Network Identifier (VNI) | Reserved | | |
17 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
18 | * | |
19 | * I = VXLAN Network Identifier (VNI) present. | |
20 | */ | |
21 | struct vxlanhdr { | |
22 | __be32 vx_flags; | |
23 | __be32 vx_vni; | |
24 | }; | |
25 | ||
26 | /* VXLAN header flags. */ | |
27 | #define VXLAN_HF_VNI BIT(27) | |
28 | ||
29 | #define VXLAN_N_VID (1u << 24) | |
30 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
31 | #define VXLAN_VNI_MASK (VXLAN_VID_MASK << 8) | |
32 | #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. */ | |
58 | #define VXLAN_HF_RCO BIT(21) | |
59 | ||
60 | /* Remote checksum offload header option */ | |
61 | #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ | |
62 | #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */ | |
63 | #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ | |
64 | #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) | |
65 | #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) | |
66 | ||
3511494c | 67 | /* |
828788ac | 68 | * VXLAN Group Based Policy Extension (VXLAN_F_GBP): |
3511494c | 69 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
828788ac | 70 | * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | |
3511494c TG |
71 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
72 | * | VXLAN Network Identifier (VNI) | Reserved | | |
73 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
74 | * | |
828788ac JB |
75 | * G = Group Policy ID present. |
76 | * | |
3511494c TG |
77 | * 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 | * | |
828788ac | 84 | * https://tools.ietf.org/html/draft-smith-vxlan-group-policy |
3511494c TG |
85 | */ |
86 | struct vxlanhdr_gbp { | |
0e715d6f | 87 | u8 vx_flags; |
3511494c | 88 | #ifdef __LITTLE_ENDIAN_BITFIELD |
0e715d6f | 89 | u8 reserved_flags1:3, |
3511494c TG |
90 | policy_applied:1, |
91 | reserved_flags2:2, | |
92 | dont_learn:1, | |
93 | reserved_flags3:1; | |
94 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
0e715d6f | 95 | u8 reserved_flags1:1, |
3511494c TG |
96 | 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 | ||
828788ac JB |
107 | /* VXLAN-GBP header flags. */ |
108 | #define VXLAN_HF_GBP BIT(31) | |
109 | ||
3511494c TG |
110 | #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) |
111 | ||
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 | ||
3511494c | 122 | struct vxlan_metadata { |
3511494c TG |
123 | u32 gbp; |
124 | }; | |
125 | ||
012a5729 PS |
126 | /* per UDP socket information */ |
127 | struct vxlan_sock { | |
128 | struct hlist_node hlist; | |
012a5729 PS |
129 | 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; | |
dc01e7d3 | 134 | struct udp_offload udp_offloads; |
dfd8645e | 135 | u32 flags; |
012a5729 PS |
136 | }; |
137 | ||
0dfbdf41 TG |
138 | union vxlan_addr { |
139 | struct sockaddr_in sin; | |
140 | struct sockaddr_in6 sin6; | |
141 | struct sockaddr sa; | |
142 | }; | |
143 | ||
144 | struct vxlan_rdst { | |
145 | union vxlan_addr remote_ip; | |
146 | __be16 remote_port; | |
147 | u32 remote_vni; | |
148 | u32 remote_ifindex; | |
149 | struct list_head list; | |
150 | struct rcu_head rcu; | |
151 | }; | |
152 | ||
153 | struct vxlan_config { | |
154 | union vxlan_addr remote_ip; | |
155 | union vxlan_addr saddr; | |
156 | u32 vni; | |
157 | int remote_ifindex; | |
158 | int mtu; | |
159 | __be16 dst_port; | |
0e715d6f JB |
160 | u16 port_min; |
161 | u16 port_max; | |
162 | u8 tos; | |
163 | u8 ttl; | |
0dfbdf41 TG |
164 | u32 flags; |
165 | unsigned long age_interval; | |
166 | unsigned int addrmax; | |
167 | bool no_share; | |
168 | }; | |
169 | ||
170 | /* Pseudo network device */ | |
171 | struct vxlan_dev { | |
172 | struct hlist_node hlist; /* vni hash table */ | |
173 | struct list_head next; /* vxlan's per namespace list */ | |
b1be00a6 JB |
174 | struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */ |
175 | #if IS_ENABLED(CONFIG_IPV6) | |
176 | struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */ | |
177 | #endif | |
0dfbdf41 TG |
178 | struct net_device *dev; |
179 | struct net *net; /* netns for packet i/o */ | |
180 | struct vxlan_rdst default_dst; /* default destination */ | |
181 | u32 flags; /* VXLAN_F_* in vxlan.h */ | |
182 | ||
183 | struct timer_list age_timer; | |
184 | spinlock_t hash_lock; | |
185 | unsigned int addrcnt; | |
58ce31cc | 186 | struct gro_cells gro_cells; |
0dfbdf41 TG |
187 | |
188 | struct vxlan_config cfg; | |
189 | ||
190 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
191 | }; | |
192 | ||
359a0ea9 TH |
193 | #define VXLAN_F_LEARN 0x01 |
194 | #define VXLAN_F_PROXY 0x02 | |
195 | #define VXLAN_F_RSC 0x04 | |
196 | #define VXLAN_F_L2MISS 0x08 | |
197 | #define VXLAN_F_L3MISS 0x10 | |
198 | #define VXLAN_F_IPV6 0x20 | |
199 | #define VXLAN_F_UDP_CSUM 0x40 | |
200 | #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 | |
201 | #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 | |
dfd8645e TH |
202 | #define VXLAN_F_REMCSUM_TX 0x200 |
203 | #define VXLAN_F_REMCSUM_RX 0x400 | |
3511494c | 204 | #define VXLAN_F_GBP 0x800 |
0ace2ca8 | 205 | #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 |
ee122c79 | 206 | #define VXLAN_F_COLLECT_METADATA 0x2000 |
359a0ea9 | 207 | |
d299ce14 | 208 | /* Flags that are used in the receive path. These flags must match in |
af33c1ad TH |
209 | * order for a socket to be shareable |
210 | */ | |
211 | #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ | |
212 | VXLAN_F_UDP_ZERO_CSUM6_RX | \ | |
0ace2ca8 | 213 | VXLAN_F_REMCSUM_RX | \ |
ee122c79 | 214 | VXLAN_F_REMCSUM_NOPARTIAL | \ |
da8b43c0 | 215 | VXLAN_F_COLLECT_METADATA) |
ac5132d1 | 216 | |
0dfbdf41 TG |
217 | struct net_device *vxlan_dev_create(struct net *net, const char *name, |
218 | u8 name_assign_type, struct vxlan_config *conf); | |
219 | ||
b1be00a6 JB |
220 | static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan, |
221 | unsigned short family) | |
614732ea | 222 | { |
b1be00a6 JB |
223 | #if IS_ENABLED(CONFIG_IPV6) |
224 | if (family == AF_INET6) | |
225 | return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport; | |
226 | #endif | |
227 | return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport; | |
614732ea | 228 | } |
49560532 | 229 | |
5f35227e JG |
230 | static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, |
231 | netdev_features_t features) | |
11bf7828 | 232 | { |
5f35227e JG |
233 | u8 l4_hdr = 0; |
234 | ||
235 | if (!skb->encapsulation) | |
236 | return features; | |
237 | ||
238 | switch (vlan_get_protocol(skb)) { | |
239 | case htons(ETH_P_IP): | |
240 | l4_hdr = ip_hdr(skb)->protocol; | |
241 | break; | |
242 | case htons(ETH_P_IPV6): | |
243 | l4_hdr = ipv6_hdr(skb)->nexthdr; | |
244 | break; | |
245 | default: | |
246 | return features;; | |
247 | } | |
248 | ||
249 | if ((l4_hdr == IPPROTO_UDP) && | |
11bf7828 JS |
250 | (skb->inner_protocol_type != ENCAP_TYPE_ETHER || |
251 | skb->inner_protocol != htons(ETH_P_TEB) || | |
252 | (skb_inner_mac_header(skb) - skb_transport_header(skb) != | |
253 | sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) | |
a188222b | 254 | return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
11bf7828 | 255 | |
5f35227e | 256 | return features; |
11bf7828 | 257 | } |
23e62de3 | 258 | |
e6cd988c JG |
259 | /* IP header + UDP + VXLAN + Ethernet header */ |
260 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
261 | /* IPv6 header + UDP + VXLAN + Ethernet header */ | |
262 | #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) | |
263 | ||
264 | #if IS_ENABLED(CONFIG_VXLAN) | |
53cf5275 | 265 | void vxlan_get_rx_port(struct net_device *netdev); |
e6cd988c JG |
266 | #else |
267 | static inline void vxlan_get_rx_port(struct net_device *netdev) | |
268 | { | |
269 | } | |
270 | #endif | |
705cc62f JB |
271 | |
272 | static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) | |
273 | { | |
274 | return vs->sock->sk->sk_family; | |
275 | } | |
48e92c44 JB |
276 | |
277 | #endif |