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