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 */ 226