datapath/linux/compat/include/net/vxlan.h

   1 #ifndef __NET_VXLAN_WRAPPER_H
   2 #define __NET_VXLAN_WRAPPER_H 1
   3
   4 #ifdef CONFIG_INET
   5 #include <net/udp_tunnel.h>
   6 #endif
   7
   8
   9 #ifdef HAVE_METADATA_DST
  10 #include_next <net/vxlan.h>
  11
  12 static inline int rpl_vxlan_init_module(void)
  13 {
  14         return 0;
  15 }
  16 static inline void rpl_vxlan_cleanup_module(void)
  17 {}
  18
  19 #define vxlan_xmit dev_queue_xmit
  20
  21 #else
  22
  23 #include <linux/ip.h>
  24 #include <linux/ipv6.h>
  25 #include <linux/if_vlan.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/udp.h>
  29 #include <net/dst_metadata.h>
  30
  31 #include "compat.h"
  32 #include "gso.h"
  33
  34 #define VNI_HASH_BITS   10
  35 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  36
  37 /*
  38  * VXLAN Group Based Policy Extension:
  39  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  40  * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R|        Group Policy ID        |
  41  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  42  * |                VXLAN Network Identifier (VNI) |   Reserved    |
  43  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *
  45  * D = Don't Learn bit. When set, this bit indicates that the egress
  46  *     VTEP MUST NOT learn the source address of the encapsulated frame.
  47  *
  48  * A = Indicates that the group policy has already been applied to
  49  *     this packet. Policies MUST NOT be applied by devices when the
  50  *     A bit is set.
  51  *
  52  * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy
  53  */
  54 struct vxlanhdr_gbp {
  55         __u8    vx_flags;
  56 #ifdef __LITTLE_ENDIAN_BITFIELD
  57         __u8    reserved_flags1:3,
  58                 policy_applied:1,
  59                 reserved_flags2:2,
  60                 dont_learn:1,
  61                 reserved_flags3:1;
  62 #elif defined(__BIG_ENDIAN_BITFIELD)
  63         __u8    reserved_flags1:1,
  64                 dont_learn:1,
  65                 reserved_flags2:2,
  66                 policy_applied:1,
  67                 reserved_flags3:3;
  68 #else
  69 #error  "Please fix <asm/byteorder.h>"
  70 #endif
  71         __be16  policy_id;
  72         __be32  vx_vni;
  73 };
  74
  75 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF)
  76
  77 /* skb->mark mapping
  78  *
  79  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  80  * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
  81  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  82  */
  83 #define VXLAN_GBP_DONT_LEARN            (BIT(6) << 16)
  84 #define VXLAN_GBP_POLICY_APPLIED        (BIT(3) << 16)
  85 #define VXLAN_GBP_ID_MASK               (0xFFFF)
  86
  87 /* VXLAN protocol header:
  88  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  89  * |G|R|R|R|I|R|R|C|               Reserved                        |
  90  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  91  * |                VXLAN Network Identifier (VNI) |   Reserved    |
  92  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  93  *
  94  * G = 1        Group Policy (VXLAN-GBP)
  95  * I = 1        VXLAN Network Identifier (VNI) present
  96  * C = 1        Remote checksum offload (RCO)
  97  */
  98 struct vxlanhdr {
  99         __be32 vx_flags;
 100         __be32 vx_vni;
 101 };
 102
 103 /* VXLAN header flags. */
 104 #define VXLAN_HF_RCO BIT(24)
 105 #define VXLAN_HF_VNI BIT(27)
 106 #define VXLAN_HF_GBP BIT(31)
 107
 108 /* Remote checksum offload header option */
 109 #define VXLAN_RCO_MASK  0x7f    /* Last byte of vni field */
 110 #define VXLAN_RCO_UDP   0x80    /* Indicate UDP RCO (TCP when not set *) */
 111 #define VXLAN_RCO_SHIFT 1       /* Left shift of start */
 112 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
 113 #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT)
 114
 115 #define VXLAN_N_VID     (1u << 24)
 116 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
 117 #define VXLAN_VNI_MASK  (VXLAN_VID_MASK << 8)
 118 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
 119
 120 struct vxlan_metadata {
 121         __be32          vni;
 122         u32             gbp;
 123 };
 124
 125 #define VNI_HASH_BITS   10
 126 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
 127 #define FDB_HASH_BITS   8
 128 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
 129
 130 /* per UDP socket information */
 131 struct vxlan_sock {
 132         struct hlist_node hlist;
 133         struct work_struct del_work;
 134         struct socket    *sock;
 135         struct rcu_head   rcu;
 136         struct hlist_head vni_list[VNI_HASH_SIZE];
 137         atomic_t          refcnt;
 138 #ifdef HAVE_UDP_OFFLOAD
 139         struct udp_offload udp_offloads;
 140 #endif
 141         u32               flags;
 142 };
 143
 144 union vxlan_addr {
 145         struct sockaddr_in sin;
 146         struct sockaddr_in6 sin6;
 147         struct sockaddr sa;
 148 };
 149
 150 struct vxlan_rdst {
 151         union vxlan_addr         remote_ip;
 152         __be16                   remote_port;
 153         u32                      remote_vni;
 154         u32                      remote_ifindex;
 155         struct list_head         list;
 156         struct rcu_head          rcu;
 157 };
 158
 159 struct vxlan_config {
 160         union vxlan_addr        remote_ip;
 161         union vxlan_addr        saddr;
 162         u32                     vni;
 163         int                     remote_ifindex;
 164         int                     mtu;
 165         __be16                  dst_port;
 166         __u16                   port_min;
 167         __u16                   port_max;
 168         __u8                    tos;
 169         __u8                    ttl;
 170         u32                     flags;
 171         unsigned long           age_interval;
 172         unsigned int            addrmax;
 173         bool                    no_share;
 174 };
 175
 176 /* Pseudo network device */
 177 struct vxlan_dev {
 178         struct hlist_node hlist;        /* vni hash table */
 179         struct list_head  next;         /* vxlan's per namespace list */
 180         struct vxlan_sock *vn_sock;     /* listening socket */
 181         struct net_device *dev;
 182         struct net        *net;         /* netns for packet i/o */
 183         struct vxlan_rdst default_dst;  /* default destination */
 184         u32               flags;        /* VXLAN_F_* in vxlan.h */
 185
 186         struct timer_list age_timer;
 187         spinlock_t        hash_lock;
 188         unsigned int      addrcnt;
 189
 190         struct vxlan_config     cfg;
 191         struct hlist_head fdb_head[FDB_HASH_SIZE];
 192 };
 193
 194 #define VXLAN_F_LEARN                   0x01
 195 #define VXLAN_F_PROXY                   0x02
 196 #define VXLAN_F_RSC                     0x04
 197 #define VXLAN_F_L2MISS                  0x08
 198 #define VXLAN_F_L3MISS                  0x10
 199 #define VXLAN_F_IPV6                    0x20
 200 #define VXLAN_F_UDP_CSUM                0x40
 201 #define VXLAN_F_UDP_ZERO_CSUM6_TX       0x80
 202 #define VXLAN_F_UDP_ZERO_CSUM6_RX       0x100
 203 #define VXLAN_F_REMCSUM_TX              0x200
 204 #define VXLAN_F_REMCSUM_RX              0x400
 205 #define VXLAN_F_GBP                     0x800
 206 #define VXLAN_F_REMCSUM_NOPARTIAL       0x1000
 207 #define VXLAN_F_COLLECT_METADATA        0x2000
 208
 209 /* Flags that are used in the receive path. These flags must match in
 210  * order for a socket to be shareable
 211  */
 212 #define VXLAN_F_RCV_FLAGS               (VXLAN_F_GBP |                  \
 213                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
 214                                          VXLAN_F_REMCSUM_RX |           \
 215                                          VXLAN_F_REMCSUM_NOPARTIAL |    \
 216                                          VXLAN_F_COLLECT_METADATA)
 217 #define vxlan_dev_create rpl_vxlan_dev_create
 218 struct net_device *rpl_vxlan_dev_create(struct net *net, const char *name,
 219                                     u8 name_assign_type, struct vxlan_config *conf);
 220
 221 static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan)
 222 {
 223         return inet_sport(vxlan->vn_sock->sock->sk);
 224 }
 225
 226 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
 227                                                      netdev_features_t features)
 228 {
 229         u8 l4_hdr = 0;
 230
 231         if (!skb_encapsulation(skb))
 232                 return features;
 233
 234         switch (vlan_get_protocol(skb)) {
 235         case htons(ETH_P_IP):
 236                 l4_hdr = ip_hdr(skb)->protocol;
 237                 break;
 238         case htons(ETH_P_IPV6):
 239                 l4_hdr = ipv6_hdr(skb)->nexthdr;
 240                 break;
 241         default:
 242                 return features;
 243         }
 244
 245         if ((l4_hdr == IPPROTO_UDP) && (
 246 #ifdef ENCAP_TYPE_ETHER
 247             skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
 248 #endif
 249              ovs_skb_get_inner_protocol(skb) != htons(ETH_P_TEB) ||
 250              (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
 251               sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
 252                 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
 253
 254         return features;
 255 }
 256
 257 /* IP header + UDP + VXLAN + Ethernet header */
 258 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
 259 /* IPv6 header + UDP + VXLAN + Ethernet header */
 260 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
 261
 262 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
 263 {
 264         return vs->sock->sk->sk_family;
 265 }
 266
 267 int rpl_vxlan_init_module(void);
 268 void rpl_vxlan_cleanup_module(void);
 269
 270 #define vxlan_xmit rpl_vxlan_xmit
 271 netdev_tx_t rpl_vxlan_xmit(struct sk_buff *skb);
 272 #endif
 273
 274 #define vxlan_init_module rpl_vxlan_init_module
 275 #define vxlan_cleanup_module rpl_vxlan_cleanup_module
 276
 277 #endif