1c5441932SPravin B Shelar #ifndef __NET_IP_TUNNELS_H 2c5441932SPravin B Shelar #define __NET_IP_TUNNELS_H 1 3c5441932SPravin B Shelar 4c5441932SPravin B Shelar #include <linux/if_tunnel.h> 5c5441932SPravin B Shelar #include <linux/netdevice.h> 6c5441932SPravin B Shelar #include <linux/skbuff.h> 7c5441932SPravin B Shelar #include <linux/types.h> 8c5441932SPravin B Shelar #include <linux/u64_stats_sync.h> 9c5441932SPravin B Shelar #include <net/dsfield.h> 10c5441932SPravin B Shelar #include <net/gro_cells.h> 11c5441932SPravin B Shelar #include <net/inet_ecn.h> 1256328486STom Herbert #include <net/netns/generic.h> 13c5441932SPravin B Shelar #include <net/rtnetlink.h> 143093fbe7SThomas Graf #include <net/lwtunnel.h> 15c5441932SPravin B Shelar 16c5441932SPravin B Shelar #if IS_ENABLED(CONFIG_IPV6) 17c5441932SPravin B Shelar #include <net/ipv6.h> 18c5441932SPravin B Shelar #include <net/ip6_fib.h> 19c5441932SPravin B Shelar #include <net/ip6_route.h> 20c5441932SPravin B Shelar #endif 21c5441932SPravin B Shelar 22c5441932SPravin B Shelar /* Keep error state on tunnel for 30 sec */ 23c5441932SPravin B Shelar #define IPTUNNEL_ERR_TIMEO (30*HZ) 24c5441932SPravin B Shelar 251d8fff90SThomas Graf /* Used to memset ip_tunnel padding. */ 26376534a3SJiri Benc #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) 271d8fff90SThomas Graf 281d8fff90SThomas Graf struct ip_tunnel_key { 291d8fff90SThomas Graf __be64 tun_id; 301d8fff90SThomas Graf __be32 ipv4_src; 311d8fff90SThomas Graf __be32 ipv4_dst; 321d8fff90SThomas Graf __be16 tun_flags; 336b8847c5SJiri Benc u8 ipv4_tos; 346b8847c5SJiri Benc u8 ipv4_ttl; 351d8fff90SThomas Graf __be16 tp_src; 361d8fff90SThomas Graf __be16 tp_dst; 37ac1cf399SJiri Benc }; 381d8fff90SThomas Graf 39ee122c79SThomas Graf /* Indicates whether the tunnel info structure represents receive 40ee122c79SThomas Graf * or transmit tunnel parameters. 41ee122c79SThomas Graf */ 42ee122c79SThomas Graf enum { 43ee122c79SThomas Graf IP_TUNNEL_INFO_RX, 44ee122c79SThomas Graf IP_TUNNEL_INFO_TX, 45ee122c79SThomas Graf }; 46ee122c79SThomas Graf 471d8fff90SThomas Graf struct ip_tunnel_info { 481d8fff90SThomas Graf struct ip_tunnel_key key; 491d8fff90SThomas Graf const void *options; 501d8fff90SThomas Graf u8 options_len; 51ee122c79SThomas Graf u8 mode; 521d8fff90SThomas Graf }; 531d8fff90SThomas Graf 54c5441932SPravin B Shelar /* 6rd prefix/relay information */ 55c5441932SPravin B Shelar #ifdef CONFIG_IPV6_SIT_6RD 56c5441932SPravin B Shelar struct ip_tunnel_6rd_parm { 57c5441932SPravin B Shelar struct in6_addr prefix; 58c5441932SPravin B Shelar __be32 relay_prefix; 59c5441932SPravin B Shelar u16 prefixlen; 60c5441932SPravin B Shelar u16 relay_prefixlen; 61c5441932SPravin B Shelar }; 62c5441932SPravin B Shelar #endif 63c5441932SPravin B Shelar 6456328486STom Herbert struct ip_tunnel_encap { 656b8847c5SJiri Benc u16 type; 666b8847c5SJiri Benc u16 flags; 6756328486STom Herbert __be16 sport; 6856328486STom Herbert __be16 dport; 6956328486STom Herbert }; 7056328486STom Herbert 71c5441932SPravin B Shelar struct ip_tunnel_prl_entry { 72c5441932SPravin B Shelar struct ip_tunnel_prl_entry __rcu *next; 73c5441932SPravin B Shelar __be32 addr; 74c5441932SPravin B Shelar u16 flags; 75c5441932SPravin B Shelar struct rcu_head rcu_head; 76c5441932SPravin B Shelar }; 77c5441932SPravin B Shelar 789a4aa9afSTom Herbert struct ip_tunnel_dst { 799a4aa9afSTom Herbert struct dst_entry __rcu *dst; 8095cb5745SDmitry Popov __be32 saddr; 819a4aa9afSTom Herbert }; 829a4aa9afSTom Herbert 832e15ea39SPravin B Shelar struct metadata_dst; 842e15ea39SPravin B Shelar 85c5441932SPravin B Shelar struct ip_tunnel { 86c5441932SPravin B Shelar struct ip_tunnel __rcu *next; 87c5441932SPravin B Shelar struct hlist_node hash_node; 88c5441932SPravin B Shelar struct net_device *dev; 895e6700b3SNicolas Dichtel struct net *net; /* netns for packet i/o */ 90c5441932SPravin B Shelar 91c5441932SPravin B Shelar int err_count; /* Number of arrived ICMP errors */ 92c5441932SPravin B Shelar unsigned long err_time; /* Time when the last ICMP error 93c5441932SPravin B Shelar * arrived */ 94c5441932SPravin B Shelar 95c5441932SPravin B Shelar /* These four fields used only by GRE */ 966b8847c5SJiri Benc u32 i_seqno; /* The last seen seqno */ 976b8847c5SJiri Benc u32 o_seqno; /* The last output seqno */ 9856328486STom Herbert int tun_hlen; /* Precalculated header length */ 99c5441932SPravin B Shelar int mlink; 100c5441932SPravin B Shelar 1019a4aa9afSTom Herbert struct ip_tunnel_dst __percpu *dst_cache; 1027d442fabSTom Herbert 103c5441932SPravin B Shelar struct ip_tunnel_parm parms; 104c5441932SPravin B Shelar 10556328486STom Herbert int encap_hlen; /* Encap header length (FOU,GUE) */ 10656328486STom Herbert struct ip_tunnel_encap encap; 10756328486STom Herbert 10856328486STom Herbert int hlen; /* tun_hlen + encap_hlen */ 10956328486STom Herbert 110c5441932SPravin B Shelar /* for SIT */ 111c5441932SPravin B Shelar #ifdef CONFIG_IPV6_SIT_6RD 112c5441932SPravin B Shelar struct ip_tunnel_6rd_parm ip6rd; 113c5441932SPravin B Shelar #endif 114c5441932SPravin B Shelar struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 115c5441932SPravin B Shelar unsigned int prl_count; /* # of entries in PRL */ 116c5441932SPravin B Shelar int ip_tnl_net_id; 117c5441932SPravin B Shelar struct gro_cells gro_cells; 1182e15ea39SPravin B Shelar bool collect_md; 119c5441932SPravin B Shelar }; 120c5441932SPravin B Shelar 121c5441932SPravin B Shelar #define TUNNEL_CSUM __cpu_to_be16(0x01) 122c5441932SPravin B Shelar #define TUNNEL_ROUTING __cpu_to_be16(0x02) 123c5441932SPravin B Shelar #define TUNNEL_KEY __cpu_to_be16(0x04) 124c5441932SPravin B Shelar #define TUNNEL_SEQ __cpu_to_be16(0x08) 125c5441932SPravin B Shelar #define TUNNEL_STRICT __cpu_to_be16(0x10) 126c5441932SPravin B Shelar #define TUNNEL_REC __cpu_to_be16(0x20) 127c5441932SPravin B Shelar #define TUNNEL_VERSION __cpu_to_be16(0x40) 128c5441932SPravin B Shelar #define TUNNEL_NO_KEY __cpu_to_be16(0x80) 1299a628224SPravin B Shelar #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) 1300b5e8b8eSAndy Zhou #define TUNNEL_OAM __cpu_to_be16(0x0200) 1310b5e8b8eSAndy Zhou #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) 1321dd144cfSThomas Graf #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) 1331dd144cfSThomas Graf #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) 1341dd144cfSThomas Graf 1351dd144cfSThomas Graf #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) 136c5441932SPravin B Shelar 137c5441932SPravin B Shelar struct tnl_ptk_info { 138c5441932SPravin B Shelar __be16 flags; 139c5441932SPravin B Shelar __be16 proto; 140c5441932SPravin B Shelar __be32 key; 141c5441932SPravin B Shelar __be32 seq; 142c5441932SPravin B Shelar }; 143c5441932SPravin B Shelar 144c5441932SPravin B Shelar #define PACKET_RCVD 0 145c5441932SPravin B Shelar #define PACKET_REJECT 1 146c5441932SPravin B Shelar 1476261d983Sstephen hemminger #define IP_TNL_HASH_BITS 7 148c5441932SPravin B Shelar #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 149c5441932SPravin B Shelar 150c5441932SPravin B Shelar struct ip_tunnel_net { 151c5441932SPravin B Shelar struct net_device *fb_tunnel_dev; 1526261d983Sstephen hemminger struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 1532e15ea39SPravin B Shelar struct ip_tunnel __rcu *collect_md_tun; 154c5441932SPravin B Shelar }; 155c5441932SPravin B Shelar 156a8c5f90fSTom Herbert struct ip_tunnel_encap_ops { 157a8c5f90fSTom Herbert size_t (*encap_hlen)(struct ip_tunnel_encap *e); 158a8c5f90fSTom Herbert int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 159a8c5f90fSTom Herbert u8 *protocol, struct flowi4 *fl4); 160a8c5f90fSTom Herbert }; 161a8c5f90fSTom Herbert 162a8c5f90fSTom Herbert #define MAX_IPTUN_ENCAP_OPS 8 163a8c5f90fSTom Herbert 164a8c5f90fSTom Herbert extern const struct ip_tunnel_encap_ops __rcu * 165a8c5f90fSTom Herbert iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 166a8c5f90fSTom Herbert 167a8c5f90fSTom Herbert int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 168a8c5f90fSTom Herbert unsigned int num); 169a8c5f90fSTom Herbert int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 170a8c5f90fSTom Herbert unsigned int num); 171a8c5f90fSTom Herbert 1721d8fff90SThomas Graf static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info, 1731d8fff90SThomas Graf __be32 saddr, __be32 daddr, 1741d8fff90SThomas Graf u8 tos, u8 ttl, 1751d8fff90SThomas Graf __be16 tp_src, __be16 tp_dst, 1761d8fff90SThomas Graf __be64 tun_id, __be16 tun_flags, 1771d8fff90SThomas Graf const void *opts, u8 opts_len) 1781d8fff90SThomas Graf { 1791d8fff90SThomas Graf tun_info->key.tun_id = tun_id; 1801d8fff90SThomas Graf tun_info->key.ipv4_src = saddr; 1811d8fff90SThomas Graf tun_info->key.ipv4_dst = daddr; 1821d8fff90SThomas Graf tun_info->key.ipv4_tos = tos; 1831d8fff90SThomas Graf tun_info->key.ipv4_ttl = ttl; 1841d8fff90SThomas Graf tun_info->key.tun_flags = tun_flags; 1851d8fff90SThomas Graf 1861d8fff90SThomas Graf /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 1871d8fff90SThomas Graf * the upper tunnel are used. 1881d8fff90SThomas Graf * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 1891d8fff90SThomas Graf */ 1901d8fff90SThomas Graf tun_info->key.tp_src = tp_src; 1911d8fff90SThomas Graf tun_info->key.tp_dst = tp_dst; 1921d8fff90SThomas Graf 1931d8fff90SThomas Graf /* Clear struct padding. */ 1941d8fff90SThomas Graf if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE) 1951d8fff90SThomas Graf memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE, 1961d8fff90SThomas Graf 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE); 1971d8fff90SThomas Graf 1981d8fff90SThomas Graf tun_info->options = opts; 1991d8fff90SThomas Graf tun_info->options_len = opts_len; 2001d8fff90SThomas Graf } 2011d8fff90SThomas Graf 2021d8fff90SThomas Graf static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info, 2031d8fff90SThomas Graf const struct iphdr *iph, 2041d8fff90SThomas Graf __be16 tp_src, __be16 tp_dst, 2051d8fff90SThomas Graf __be64 tun_id, __be16 tun_flags, 2061d8fff90SThomas Graf const void *opts, u8 opts_len) 2071d8fff90SThomas Graf { 2081d8fff90SThomas Graf __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr, 2091d8fff90SThomas Graf iph->tos, iph->ttl, tp_src, tp_dst, 2101d8fff90SThomas Graf tun_id, tun_flags, opts, opts_len); 2111d8fff90SThomas Graf } 2121d8fff90SThomas Graf 2135243b6acSJesse Gross #ifdef CONFIG_INET 2145243b6acSJesse Gross 215c5441932SPravin B Shelar int ip_tunnel_init(struct net_device *dev); 216c5441932SPravin B Shelar void ip_tunnel_uninit(struct net_device *dev); 217c5441932SPravin B Shelar void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 2181728d4faSNicolas Dichtel struct net *ip_tunnel_get_link_net(const struct net_device *dev); 2191e99584bSNicolas Dichtel int ip_tunnel_get_iflink(const struct net_device *dev); 220d3b6f614SEric Dumazet int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 221c5441932SPravin B Shelar struct rtnl_link_ops *ops, char *devname); 222c5441932SPravin B Shelar 2236c742e71SNicolas Dichtel void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); 224c5441932SPravin B Shelar 225c5441932SPravin B Shelar void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 226bf3d6a8fSNicolas Dichtel const struct iphdr *tnl_params, const u8 protocol); 227c5441932SPravin B Shelar int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 22856328486STom Herbert int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, 22956328486STom Herbert u8 *protocol, struct flowi4 *fl4); 230c5441932SPravin B Shelar int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 231c5441932SPravin B Shelar 232c5441932SPravin B Shelar struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 233c5441932SPravin B Shelar struct rtnl_link_stats64 *tot); 234c5441932SPravin B Shelar struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 235c5441932SPravin B Shelar int link, __be16 flags, 236c5441932SPravin B Shelar __be32 remote, __be32 local, 237c5441932SPravin B Shelar __be32 key); 238c5441932SPravin B Shelar 239c5441932SPravin B Shelar int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 2402e15ea39SPravin B Shelar const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 2412e15ea39SPravin B Shelar bool log_ecn_error); 242c5441932SPravin B Shelar int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 243c5441932SPravin B Shelar struct ip_tunnel_parm *p); 244c5441932SPravin B Shelar int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 245c5441932SPravin B Shelar struct ip_tunnel_parm *p); 246c5441932SPravin B Shelar void ip_tunnel_setup(struct net_device *dev, int net_id); 247cf71d2bcSNicolas Dichtel void ip_tunnel_dst_reset_all(struct ip_tunnel *t); 24856328486STom Herbert int ip_tunnel_encap_setup(struct ip_tunnel *t, 24956328486STom Herbert struct ip_tunnel_encap *ipencap); 250c5441932SPravin B Shelar 251c5441932SPravin B Shelar /* Extract dsfield from inner protocol */ 252c5441932SPravin B Shelar static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 253c5441932SPravin B Shelar const struct sk_buff *skb) 254c5441932SPravin B Shelar { 255c5441932SPravin B Shelar if (skb->protocol == htons(ETH_P_IP)) 256c5441932SPravin B Shelar return iph->tos; 257c5441932SPravin B Shelar else if (skb->protocol == htons(ETH_P_IPV6)) 258c5441932SPravin B Shelar return ipv6_get_dsfield((const struct ipv6hdr *)iph); 259c5441932SPravin B Shelar else 260c5441932SPravin B Shelar return 0; 261c5441932SPravin B Shelar } 262c5441932SPravin B Shelar 263c5441932SPravin B Shelar /* Propogate ECN bits out */ 264c5441932SPravin B Shelar static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 265c5441932SPravin B Shelar const struct sk_buff *skb) 266c5441932SPravin B Shelar { 267c5441932SPravin B Shelar u8 inner = ip_tunnel_get_dsfield(iph, skb); 268c5441932SPravin B Shelar 269c5441932SPravin B Shelar return INET_ECN_encapsulate(tos, inner); 270c5441932SPravin B Shelar } 271c5441932SPravin B Shelar 2723d7b46cdSPravin B Shelar int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); 273aad88724SEric Dumazet int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 2746b8847c5SJiri Benc __be32 src, __be32 dst, u8 proto, 2756b8847c5SJiri Benc u8 tos, u8 ttl, __be16 df, bool xnet); 2760e6fbc5bSPravin B Shelar 2772d26f0a3SEric Dumazet struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, 2782d26f0a3SEric Dumazet int gso_type_mask); 2792d26f0a3SEric Dumazet 2800e6fbc5bSPravin B Shelar static inline void iptunnel_xmit_stats(int err, 2810e6fbc5bSPravin B Shelar struct net_device_stats *err_stats, 2828f84985fSLi RongQing struct pcpu_sw_netstats __percpu *stats) 283c5441932SPravin B Shelar { 2840e6fbc5bSPravin B Shelar if (err > 0) { 2858f84985fSLi RongQing struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); 286c5441932SPravin B Shelar 287c5441932SPravin B Shelar u64_stats_update_begin(&tstats->syncp); 2880e6fbc5bSPravin B Shelar tstats->tx_bytes += err; 289c5441932SPravin B Shelar tstats->tx_packets++; 290c5441932SPravin B Shelar u64_stats_update_end(&tstats->syncp); 2910e6fbc5bSPravin B Shelar } else if (err < 0) { 2920e6fbc5bSPravin B Shelar err_stats->tx_errors++; 2930e6fbc5bSPravin B Shelar err_stats->tx_aborted_errors++; 294c5441932SPravin B Shelar } else { 2950e6fbc5bSPravin B Shelar err_stats->tx_dropped++; 296c5441932SPravin B Shelar } 297c5441932SPravin B Shelar } 2985243b6acSJesse Gross 299ee122c79SThomas Graf static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n) 300ee122c79SThomas Graf { 301ee122c79SThomas Graf return info + 1; 302ee122c79SThomas Graf } 303ee122c79SThomas Graf 3043093fbe7SThomas Graf static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 3053093fbe7SThomas Graf { 3063093fbe7SThomas Graf return (struct ip_tunnel_info *)lwtstate->data; 3073093fbe7SThomas Graf } 3083093fbe7SThomas Graf 309e7030878SThomas Graf extern struct static_key ip_tunnel_metadata_cnt; 310e7030878SThomas Graf 311e7030878SThomas Graf /* Returns > 0 if metadata should be collected */ 312e7030878SThomas Graf static inline int ip_tunnel_collect_metadata(void) 313e7030878SThomas Graf { 314e7030878SThomas Graf return static_key_false(&ip_tunnel_metadata_cnt); 315e7030878SThomas Graf } 316e7030878SThomas Graf 317045a0fa0SThomas Graf void __init ip_tunnel_core_init(void); 318045a0fa0SThomas Graf 319e7030878SThomas Graf void ip_tunnel_need_metadata(void); 320e7030878SThomas Graf void ip_tunnel_unneed_metadata(void); 321e7030878SThomas Graf 32205283187SThomas Graf #else /* CONFIG_INET */ 32305283187SThomas Graf 32405283187SThomas Graf static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 32505283187SThomas Graf { 32605283187SThomas Graf return NULL; 32705283187SThomas Graf } 32805283187SThomas Graf 32905283187SThomas Graf static inline void ip_tunnel_need_metadata(void) 33005283187SThomas Graf { 33105283187SThomas Graf } 33205283187SThomas Graf 33305283187SThomas Graf static inline void ip_tunnel_unneed_metadata(void) 33405283187SThomas Graf { 33505283187SThomas Graf } 33605283187SThomas Graf 3375243b6acSJesse Gross #endif /* CONFIG_INET */ 3385243b6acSJesse Gross 339c5441932SPravin B Shelar #endif /* __NET_IP_TUNNELS_H */ 340