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