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

   1 #ifndef __NET_IP_TUNNELS_WRAPPER_H
   2 #define __NET_IP_TUNNELS_WRAPPER_H 1
   3
   4 #include <linux/version.h>
   5
   6 #ifdef HAVE_METADATA_DST
   7 /* Block all ip_tunnel functions.
   8  * Only function that do not depend on ip_tunnel structure can
   9  * be used. Those needs to be explicitly defined in this header file. */
  10 #include_next <net/ip_tunnels.h>
  11 #endif
  12
  13 #include <linux/if_tunnel.h>
  14 #include <linux/types.h>
  15 #include <net/dsfield.h>
  16 #include <net/flow.h>
  17 #include <net/inet_ecn.h>
  18 #include <net/ip.h>
  19 #include <net/rtnetlink.h>
  20
  21 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
  22 struct sk_buff *ovs_iptunnel_handle_offloads(struct sk_buff *skb,
  23                                              bool csum_help, int gso_type_mask,
  24                                              void (*fix_segment)(struct sk_buff *));
  25
  26 #define iptunnel_xmit rpl_iptunnel_xmit
  27 int rpl_iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
  28                       __be32 src, __be32 dst, __u8 proto, __u8 tos, __u8 ttl,
  29                       __be16 df, bool xnet);
  30
  31 #define iptunnel_pull_header rpl_iptunnel_pull_header
  32 int rpl_iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
  33
  34 #else
  35
  36 #define ovs_iptunnel_handle_offloads(skb, csum_help, gso_type_mask, fix_segment) \
  37         iptunnel_handle_offloads(skb, csum_help, gso_type_mask)
  38
  39 /* This macro is to make OVS build happy about declared functions name. */
  40 #define rpl_iptunnel_pull_header iptunnel_pull_header
  41 int rpl_iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
  42
  43 #define rpl_iptunnel_xmit iptunnel_xmit
  44 int rpl_iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
  45                       __be32 src, __be32 dst, __u8 proto, __u8 tos, __u8 ttl,
  46                       __be16 df, bool xnet);
  47
  48 #endif /* 3.18 */
  49
  50 /* This is not required for OVS on kernel older than 3.18, but gre.h
  51  * header file needs this declaration for function gre_handle_offloads().
  52  * So it is defined for all kernel version.
  53  */
  54 #define rpl_iptunnel_handle_offloads iptunnel_handle_offloads
  55 struct sk_buff *rpl_iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
  56                                          int gso_type_mask);
  57
  58 #ifndef TUNNEL_CSUM
  59 #define TUNNEL_CSUM     __cpu_to_be16(0x01)
  60 #define TUNNEL_ROUTING  __cpu_to_be16(0x02)
  61 #define TUNNEL_KEY      __cpu_to_be16(0x04)
  62 #define TUNNEL_SEQ      __cpu_to_be16(0x08)
  63 #define TUNNEL_STRICT   __cpu_to_be16(0x10)
  64 #define TUNNEL_REC      __cpu_to_be16(0x20)
  65 #define TUNNEL_VERSION  __cpu_to_be16(0x40)
  66 #define TUNNEL_NO_KEY   __cpu_to_be16(0x80)
  67
  68 struct tnl_ptk_info {
  69         __be16 flags;
  70         __be16 proto;
  71         __be32 key;
  72         __be32 seq;
  73 };
  74
  75 #define PACKET_RCVD     0
  76 #define PACKET_REJECT   1
  77 #endif
  78
  79 #ifndef TUNNEL_DONT_FRAGMENT
  80 #define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
  81 #endif
  82
  83 #ifndef TUNNEL_OAM
  84 #define TUNNEL_OAM      __cpu_to_be16(0x0200)
  85 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
  86 #endif
  87
  88 #ifndef TUNNEL_GENEVE_OPT
  89 #define TUNNEL_GENEVE_OPT       __cpu_to_be16(0x0800)
  90 #endif
  91
  92 #ifndef TUNNEL_VXLAN_OPT
  93 #define TUNNEL_VXLAN_OPT        __cpu_to_be16(0x1000)
  94 #endif
  95
  96 /* Older kernels defined TUNNEL_OPTIONS_PRESENT to GENEVE only */
  97 #undef TUNNEL_OPTIONS_PRESENT
  98 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
  99
 100 #define skb_is_encapsulated ovs_skb_is_encapsulated
 101 bool ovs_skb_is_encapsulated(struct sk_buff *skb);
 102
 103 #ifndef HAVE_METADATA_DST
 104 /* Used to memset ip_tunnel padding. */
 105 #define IP_TUNNEL_KEY_SIZE      offsetofend(struct ip_tunnel_key, tp_dst)
 106
 107 /* Used to memset ipv4 address padding. */
 108 #define IP_TUNNEL_KEY_IPV4_PAD  offsetofend(struct ip_tunnel_key, u.ipv4.dst)
 109 #define IP_TUNNEL_KEY_IPV4_PAD_LEN                              \
 110         (FIELD_SIZEOF(struct ip_tunnel_key, u) -                \
 111          FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
 112
 113 struct ip_tunnel_key {
 114         __be64                  tun_id;
 115         union {
 116                 struct {
 117                         __be32  src;
 118                         __be32  dst;
 119                 } ipv4;
 120                 struct {
 121                         struct in6_addr src;
 122                         struct in6_addr dst;
 123                 } ipv6;
 124         } u;
 125         __be16                  tun_flags;
 126         u8                      tos;            /* TOS for IPv4, TC for IPv6 */
 127         u8                      ttl;            /* TTL for IPv4, HL for IPv6 */
 128         __be16                  tp_src;
 129         __be16                  tp_dst;
 130 };
 131
 132 /* Flags for ip_tunnel_info mode. */
 133 #define IP_TUNNEL_INFO_TX       0x01    /* represents tx tunnel parameters */
 134 #define IP_TUNNEL_INFO_IPV6     0x02    /* key contains IPv6 addresses */
 135
 136 struct ip_tunnel_info {
 137         struct ip_tunnel_key    key;
 138         u8                      options_len;
 139         u8                      mode;
 140 };
 141
 142 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info *tun_info)
 143 {
 144         return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
 145 }
 146
 147 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
 148 {
 149         return info + 1;
 150 }
 151
 152 static inline void ip_tunnel_info_opts_get(void *to,
 153                                            const struct ip_tunnel_info *info)
 154 {
 155         memcpy(to, info + 1, info->options_len);
 156 }
 157
 158 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
 159                                            const void *from, int len)
 160 {
 161         memcpy(ip_tunnel_info_opts(info), from, len);
 162         info->options_len = len;
 163 }
 164
 165 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
 166                                       __be32 saddr, __be32 daddr,
 167                                       u8 tos, u8 ttl,
 168                                       __be16 tp_src, __be16 tp_dst,
 169                                       __be64 tun_id, __be16 tun_flags)
 170 {
 171         key->tun_id = tun_id;
 172         key->u.ipv4.src = saddr;
 173         key->u.ipv4.dst = daddr;
 174         memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
 175                0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
 176         key->tos = tos;
 177         key->ttl = ttl;
 178         key->tun_flags = tun_flags;
 179
 180         /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
 181          * the upper tunnel are used.
 182          * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
 183          */
 184         key->tp_src = tp_src;
 185         key->tp_dst = tp_dst;
 186
 187         /* Clear struct padding. */
 188         if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
 189                 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
 190                        0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
 191 }
 192
 193 #define ip_tunnel_collect_metadata() true
 194
 195
 196 #define ip_tunnel rpl_ip_tunnel
 197
 198 struct ip_tunnel {
 199         struct net_device       *dev;
 200         struct net              *net;   /* netns for packet i/o */
 201
 202         int             err_count;      /* Number of arrived ICMP errors */
 203         unsigned long   err_time;       /* Time when the last ICMP error
 204                                          * arrived
 205                                          */
 206
 207         /* These four fields used only by GRE */
 208         u32             i_seqno;        /* The last seen seqno  */
 209         u32             o_seqno;        /* The last output seqno */
 210         int             tun_hlen;       /* Precalculated header length */
 211         int             mlink;
 212
 213         struct ip_tunnel_parm parms;
 214
 215         int             encap_hlen;     /* Encap header length (FOU,GUE) */
 216         int             hlen;           /* tun_hlen + encap_hlen */
 217
 218         int             ip_tnl_net_id;
 219         bool            collect_md;
 220 };
 221
 222 #define ip_tunnel_net rpl_ip_tunnel_net
 223 struct ip_tunnel_net {
 224         struct ip_tunnel __rcu *collect_md_tun;
 225         struct rtnl_link_ops *rtnl_ops;
 226 };
 227
 228
 229 #ifndef HAVE_PCPU_SW_NETSTATS
 230 #define ip_tunnel_get_stats64 rpl_ip_tunnel_get_stats64
 231 #else
 232 #define rpl_ip_tunnel_get_stats64 ip_tunnel_get_stats64
 233 #endif
 234 struct rtnl_link_stats64 *rpl_ip_tunnel_get_stats64(struct net_device *dev,
 235                                                     struct rtnl_link_stats64 *tot);
 236
 237 #define ip_tunnel_get_dsfield rpl_ip_tunnel_get_dsfield
 238 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
 239                 const struct sk_buff *skb)
 240 {
 241         if (skb->protocol == htons(ETH_P_IP))
 242                 return iph->tos;
 243         else if (skb->protocol == htons(ETH_P_IPV6))
 244                 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
 245         else
 246                 return 0;
 247 }
 248
 249 #define ip_tunnel_ecn_encap rpl_ip_tunnel_ecn_encap
 250 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
 251                 const struct sk_buff *skb)
 252 {
 253         u8 inner = ip_tunnel_get_dsfield(iph, skb);
 254
 255         return INET_ECN_encapsulate(tos, inner);
 256 }
 257
 258 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 259 #define iptunnel_xmit_stats(err, stats, dummy)          \
 260 do {                                                    \
 261         if (err > 0) {                                  \
 262                 (stats)->tx_bytes += err;               \
 263                 (stats)->tx_packets++;                  \
 264         } else if (err < 0) {                           \
 265                 (stats)->tx_errors++;                   \
 266                 (stats)->tx_aborted_errors++;           \
 267         } else {                                        \
 268                 (stats)->tx_dropped++;                  \
 269         }                                               \
 270 } while (0)
 271
 272 #else
 273 #define iptunnel_xmit_stats rpl_iptunnel_xmit_stats
 274 static inline void iptunnel_xmit_stats(int err,
 275                 struct net_device_stats *err_stats,
 276                 struct pcpu_sw_netstats __percpu *stats)
 277 {
 278         if (err > 0) {
 279                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
 280
 281                 u64_stats_update_begin(&tstats->syncp);
 282                 tstats->tx_bytes += err;
 283                 tstats->tx_packets++;
 284                 u64_stats_update_end(&tstats->syncp);
 285         } else if (err < 0) {
 286                 err_stats->tx_errors++;
 287                 err_stats->tx_aborted_errors++;
 288         } else {
 289                 err_stats->tx_dropped++;
 290         }
 291 }
 292 #endif
 293
 294 #define ip_tunnel_init rpl_ip_tunnel_init
 295 int rpl_ip_tunnel_init(struct net_device *dev);
 296
 297 #define ip_tunnel_uninit rpl_ip_tunnel_uninit
 298 void rpl_ip_tunnel_uninit(struct net_device *dev);
 299
 300 #define ip_tunnel_change_mtu rpl_ip_tunnel_change_mtu
 301 int rpl_ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
 302
 303 #define ip_tunnel_newlink rpl_ip_tunnel_newlink
 304 int rpl_ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
 305                           struct ip_tunnel_parm *p);
 306
 307 #define ip_tunnel_dellink rpl_ip_tunnel_dellink
 308 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 309 void rpl_ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
 310 #else
 311 void rpl_ip_tunnel_dellink(struct net_device *dev);
 312 #endif
 313
 314 #define ip_tunnel_init_net rpl_ip_tunnel_init_net
 315 int rpl_ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
 316                            struct rtnl_link_ops *ops, char *devname);
 317
 318 #define ip_tunnel_delete_net rpl_ip_tunnel_delete_net
 319 void rpl_ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
 320
 321 #define ip_tunnel_setup rpl_ip_tunnel_setup
 322 void rpl_ip_tunnel_setup(struct net_device *dev, int net_id);
 323
 324 #define ip_tunnel_get_iflink rpl_ip_tunnel_get_iflink
 325 int rpl_ip_tunnel_get_iflink(const struct net_device *dev);
 326
 327 #define ip_tunnel_get_link_net rpl_ip_tunnel_get_link_net
 328 struct net *rpl_ip_tunnel_get_link_net(const struct net_device *dev);
 329 #endif /* HAVE_METADATA_DST */
 330
 331 #ifndef HAVE___IP_TUNNEL_CHANGE_MTU
 332 #define __ip_tunnel_change_mtu rpl___ip_tunnel_change_mtu
 333 int rpl___ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
 334 #endif
 335
 336 #endif /* __NET_IP_TUNNELS_H */