include/net/ip_tunnels.h

   1 #ifndef __NET_IP_TUNNELS_H
   2 #define __NET_IP_TUNNELS_H 1
   3
   4 #include <linux/if_tunnel.h>
   5 #include <linux/netdevice.h>
   6 #include <linux/skbuff.h>
   7 #include <linux/types.h>
   8 #include <linux/u64_stats_sync.h>
   9 #include <net/dsfield.h>
  10 #include <net/gro_cells.h>
  11 #include <net/inet_ecn.h>
  12 #include <net/ip.h>
  13 #include <net/netns/generic.h>
  14 #include <net/rtnetlink.h>
  15
  16 #if IS_ENABLED(CONFIG_IPV6)
  17 #include <net/ipv6.h>
  18 #include <net/ip6_fib.h>
  19 #include <net/ip6_route.h>
  20 #endif
  21
  22 /* Keep error state on tunnel for 30 sec */
  23 #define IPTUNNEL_ERR_TIMEO      (30*HZ)
  24
  25 /* 6rd prefix/relay information */
  26 #ifdef CONFIG_IPV6_SIT_6RD
  27 struct ip_tunnel_6rd_parm {
  28         struct in6_addr         prefix;
  29         __be32                  relay_prefix;
  30         u16                     prefixlen;
  31         u16                     relay_prefixlen;
  32 };
  33 #endif
  34
  35 struct ip_tunnel_encap {
  36         __u16                   type;
  37         __u16                   flags;
  38         __be16                  sport;
  39         __be16                  dport;
  40 };
  41
  42 struct ip_tunnel_prl_entry {
  43         struct ip_tunnel_prl_entry __rcu *next;
  44         __be32                          addr;
  45         u16                             flags;
  46         struct rcu_head                 rcu_head;
  47 };
  48
  49 struct ip_tunnel_dst {
  50         struct dst_entry __rcu          *dst;
  51         __be32                           saddr;
  52 };
  53
  54 struct ip_tunnel {
  55         struct ip_tunnel __rcu  *next;
  56         struct hlist_node hash_node;
  57         struct net_device       *dev;
  58         struct net              *net;   /* netns for packet i/o */
  59
  60         int             err_count;      /* Number of arrived ICMP errors */
  61         unsigned long   err_time;       /* Time when the last ICMP error
  62                                          * arrived */
  63
  64         /* These four fields used only by GRE */
  65         __u32           i_seqno;        /* The last seen seqno  */
  66         __u32           o_seqno;        /* The last output seqno */
  67         int             tun_hlen;       /* Precalculated header length */
  68         int             mlink;
  69
  70         struct ip_tunnel_dst __percpu *dst_cache;
  71
  72         struct ip_tunnel_parm parms;
  73
  74         int             encap_hlen;     /* Encap header length (FOU,GUE) */
  75         struct ip_tunnel_encap encap;
  76
  77         int             hlen;           /* tun_hlen + encap_hlen */
  78
  79         /* for SIT */
  80 #ifdef CONFIG_IPV6_SIT_6RD
  81         struct ip_tunnel_6rd_parm ip6rd;
  82 #endif
  83         struct ip_tunnel_prl_entry __rcu *prl;  /* potential router list */
  84         unsigned int            prl_count;      /* # of entries in PRL */
  85         int                     ip_tnl_net_id;
  86         struct gro_cells        gro_cells;
  87 };
  88
  89 #define TUNNEL_CSUM             __cpu_to_be16(0x01)
  90 #define TUNNEL_ROUTING          __cpu_to_be16(0x02)
  91 #define TUNNEL_KEY              __cpu_to_be16(0x04)
  92 #define TUNNEL_SEQ              __cpu_to_be16(0x08)
  93 #define TUNNEL_STRICT           __cpu_to_be16(0x10)
  94 #define TUNNEL_REC              __cpu_to_be16(0x20)
  95 #define TUNNEL_VERSION          __cpu_to_be16(0x40)
  96 #define TUNNEL_NO_KEY           __cpu_to_be16(0x80)
  97 #define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
  98 #define TUNNEL_OAM              __cpu_to_be16(0x0200)
  99 #define TUNNEL_CRIT_OPT         __cpu_to_be16(0x0400)
 100 #define TUNNEL_GENEVE_OPT       __cpu_to_be16(0x0800)
 101 #define TUNNEL_VXLAN_OPT        __cpu_to_be16(0x1000)
 102
 103 #define TUNNEL_OPTIONS_PRESENT  (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
 104
 105 struct tnl_ptk_info {
 106         __be16 flags;
 107         __be16 proto;
 108         __be32 key;
 109         __be32 seq;
 110 };
 111
 112 #define PACKET_RCVD     0
 113 #define PACKET_REJECT   1
 114
 115 #define IP_TNL_HASH_BITS   7
 116 #define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)
 117
 118 struct ip_tunnel_net {
 119         struct net_device *fb_tunnel_dev;
 120         struct hlist_head tunnels[IP_TNL_HASH_SIZE];
 121 };
 122
 123 struct ip_tunnel_encap_ops {
 124         size_t (*encap_hlen)(struct ip_tunnel_encap *e);
 125         int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
 126                             u8 *protocol, struct flowi4 *fl4);
 127 };
 128
 129 #define MAX_IPTUN_ENCAP_OPS 8
 130
 131 extern const struct ip_tunnel_encap_ops __rcu *
 132                 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
 133
 134 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
 135                             unsigned int num);
 136 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
 137                             unsigned int num);
 138
 139 #ifdef CONFIG_INET
 140
 141 int ip_tunnel_init(struct net_device *dev);
 142 void ip_tunnel_uninit(struct net_device *dev);
 143 void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
 144 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
 145 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
 146                        struct rtnl_link_ops *ops, char *devname);
 147
 148 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
 149
 150 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 151                     const struct iphdr *tnl_params, const u8 protocol);
 152 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
 153 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
 154                     u8 *protocol, struct flowi4 *fl4);
 155 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
 156
 157 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
 158                                                 struct rtnl_link_stats64 *tot);
 159 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
 160                                    int link, __be16 flags,
 161                                    __be32 remote, __be32 local,
 162                                    __be32 key);
 163
 164 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
 165                   const struct tnl_ptk_info *tpi, bool log_ecn_error);
 166 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
 167                          struct ip_tunnel_parm *p);
 168 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
 169                       struct ip_tunnel_parm *p);
 170 void ip_tunnel_setup(struct net_device *dev, int net_id);
 171 void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
 172 int ip_tunnel_encap_setup(struct ip_tunnel *t,
 173                           struct ip_tunnel_encap *ipencap);
 174
 175 /* Extract dsfield from inner protocol */
 176 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
 177                                        const struct sk_buff *skb)
 178 {
 179         if (skb->protocol == htons(ETH_P_IP))
 180                 return iph->tos;
 181         else if (skb->protocol == htons(ETH_P_IPV6))
 182                 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
 183         else
 184                 return 0;
 185 }
 186
 187 /* Propogate ECN bits out */
 188 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
 189                                      const struct sk_buff *skb)
 190 {
 191         u8 inner = ip_tunnel_get_dsfield(iph, skb);
 192
 193         return INET_ECN_encapsulate(tos, inner);
 194 }
 195
 196 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
 197 int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 198                   __be32 src, __be32 dst, __u8 proto,
 199                   __u8 tos, __u8 ttl, __be16 df, bool xnet);
 200
 201 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
 202                                          int gso_type_mask);
 203
 204 static inline void iptunnel_xmit_stats(int err,
 205                                        struct net_device_stats *err_stats,
 206                                        struct pcpu_sw_netstats __percpu *stats)
 207 {
 208         if (err > 0) {
 209                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
 210
 211                 u64_stats_update_begin(&tstats->syncp);
 212                 tstats->tx_bytes += err;
 213                 tstats->tx_packets++;
 214                 u64_stats_update_end(&tstats->syncp);
 215         } else if (err < 0) {
 216                 err_stats->tx_errors++;
 217                 err_stats->tx_aborted_errors++;
 218         } else {
 219                 err_stats->tx_dropped++;
 220         }
 221 }
 222
 223 #endif /* CONFIG_INET */
 224
 225 #endif /* __NET_IP_TUNNELS_H */