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 __be32 saddr; 44 }; 45 46 struct ip_tunnel { 47 struct ip_tunnel __rcu *next; 48 struct hlist_node hash_node; 49 struct net_device *dev; 50 struct net *net; /* netns for packet i/o */ 51 52 int err_count; /* Number of arrived ICMP errors */ 53 unsigned long err_time; /* Time when the last ICMP error 54 * arrived */ 55 56 /* These four fields used only by GRE */ 57 __u32 i_seqno; /* The last seen seqno */ 58 __u32 o_seqno; /* The last output seqno */ 59 int hlen; /* Precalculated header length */ 60 int mlink; 61 62 struct ip_tunnel_dst __percpu *dst_cache; 63 64 struct ip_tunnel_parm parms; 65 66 /* for SIT */ 67 #ifdef CONFIG_IPV6_SIT_6RD 68 struct ip_tunnel_6rd_parm ip6rd; 69 #endif 70 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 71 unsigned int prl_count; /* # of entries in PRL */ 72 int ip_tnl_net_id; 73 struct gro_cells gro_cells; 74 }; 75 76 #define TUNNEL_CSUM __cpu_to_be16(0x01) 77 #define TUNNEL_ROUTING __cpu_to_be16(0x02) 78 #define TUNNEL_KEY __cpu_to_be16(0x04) 79 #define TUNNEL_SEQ __cpu_to_be16(0x08) 80 #define TUNNEL_STRICT __cpu_to_be16(0x10) 81 #define TUNNEL_REC __cpu_to_be16(0x20) 82 #define TUNNEL_VERSION __cpu_to_be16(0x40) 83 #define TUNNEL_NO_KEY __cpu_to_be16(0x80) 84 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) 85 86 struct tnl_ptk_info { 87 __be16 flags; 88 __be16 proto; 89 __be32 key; 90 __be32 seq; 91 }; 92 93 #define PACKET_RCVD 0 94 #define PACKET_REJECT 1 95 96 #define IP_TNL_HASH_BITS 7 97 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 98 99 struct ip_tunnel_net { 100 struct net_device *fb_tunnel_dev; 101 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 102 }; 103 104 #ifdef CONFIG_INET 105 106 int ip_tunnel_init(struct net_device *dev); 107 void ip_tunnel_uninit(struct net_device *dev); 108 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 109 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 110 struct rtnl_link_ops *ops, char *devname); 111 112 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); 113 114 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 115 const struct iphdr *tnl_params, const u8 protocol); 116 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 117 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 118 119 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 120 struct rtnl_link_stats64 *tot); 121 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 122 int link, __be16 flags, 123 __be32 remote, __be32 local, 124 __be32 key); 125 126 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 127 const struct tnl_ptk_info *tpi, bool log_ecn_error); 128 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 129 struct ip_tunnel_parm *p); 130 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 131 struct ip_tunnel_parm *p); 132 void ip_tunnel_setup(struct net_device *dev, int net_id); 133 void ip_tunnel_dst_reset_all(struct ip_tunnel *t); 134 135 /* Extract dsfield from inner protocol */ 136 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 137 const struct sk_buff *skb) 138 { 139 if (skb->protocol == htons(ETH_P_IP)) 140 return iph->tos; 141 else if (skb->protocol == htons(ETH_P_IPV6)) 142 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 143 else 144 return 0; 145 } 146 147 /* Propogate ECN bits out */ 148 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 149 const struct sk_buff *skb) 150 { 151 u8 inner = ip_tunnel_get_dsfield(iph, skb); 152 153 return INET_ECN_encapsulate(tos, inner); 154 } 155 156 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); 157 int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 158 __be32 src, __be32 dst, __u8 proto, 159 __u8 tos, __u8 ttl, __be16 df, bool xnet); 160 161 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, 162 int gso_type_mask); 163 164 static inline void iptunnel_xmit_stats(int err, 165 struct net_device_stats *err_stats, 166 struct pcpu_sw_netstats __percpu *stats) 167 { 168 if (err > 0) { 169 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); 170 171 u64_stats_update_begin(&tstats->syncp); 172 tstats->tx_bytes += err; 173 tstats->tx_packets++; 174 u64_stats_update_end(&tstats->syncp); 175 } else if (err < 0) { 176 err_stats->tx_errors++; 177 err_stats->tx_aborted_errors++; 178 } else { 179 err_stats->tx_dropped++; 180 } 181 } 182 183 #endif /* CONFIG_INET */ 184 185 #endif /* __NET_IP_TUNNELS_H */ 186