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 27struct ip_tunnel_6rd_parm { 28 struct in6_addr prefix; 29 __be32 relay_prefix; 30 u16 prefixlen; 31 u16 relay_prefixlen; 32}; 33#endif 34 35struct ip_tunnel_encap { 36 __u16 type; 37 __u16 flags; 38 __be16 sport; 39 __be16 dport; 40}; 41 42struct 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 49struct ip_tunnel_dst { 50 struct dst_entry __rcu *dst; 51 __be32 saddr; 52}; 53 54struct 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 105struct 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 118struct ip_tunnel_net { 119 struct net_device *fb_tunnel_dev; 120 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 121}; 122 123struct 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 131extern const struct ip_tunnel_encap_ops __rcu * 132 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 133 134int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 135 unsigned int num); 136int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 137 unsigned int num); 138 139#ifdef CONFIG_INET 140 141int ip_tunnel_init(struct net_device *dev); 142void ip_tunnel_uninit(struct net_device *dev); 143void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 144struct net *ip_tunnel_get_link_net(const struct net_device *dev); 145int ip_tunnel_get_iflink(const struct net_device *dev); 146int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 147 struct rtnl_link_ops *ops, char *devname); 148 149void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); 150 151void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 152 const struct iphdr *tnl_params, const u8 protocol); 153int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 154int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, 155 u8 *protocol, struct flowi4 *fl4); 156int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 157 158struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 159 struct rtnl_link_stats64 *tot); 160struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 161 int link, __be16 flags, 162 __be32 remote, __be32 local, 163 __be32 key); 164 165int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 166 const struct tnl_ptk_info *tpi, bool log_ecn_error); 167int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 168 struct ip_tunnel_parm *p); 169int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 170 struct ip_tunnel_parm *p); 171void ip_tunnel_setup(struct net_device *dev, int net_id); 172void ip_tunnel_dst_reset_all(struct ip_tunnel *t); 173int ip_tunnel_encap_setup(struct ip_tunnel *t, 174 struct ip_tunnel_encap *ipencap); 175 176/* Extract dsfield from inner protocol */ 177static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 178 const struct sk_buff *skb) 179{ 180 if (skb->protocol == htons(ETH_P_IP)) 181 return iph->tos; 182 else if (skb->protocol == htons(ETH_P_IPV6)) 183 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 184 else 185 return 0; 186} 187 188/* Propogate ECN bits out */ 189static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 190 const struct sk_buff *skb) 191{ 192 u8 inner = ip_tunnel_get_dsfield(iph, skb); 193 194 return INET_ECN_encapsulate(tos, inner); 195} 196 197int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); 198int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 199 __be32 src, __be32 dst, __u8 proto, 200 __u8 tos, __u8 ttl, __be16 df, bool xnet); 201 202struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, 203 int gso_type_mask); 204 205static inline void iptunnel_xmit_stats(int err, 206 struct net_device_stats *err_stats, 207 struct pcpu_sw_netstats __percpu *stats) 208{ 209 if (err > 0) { 210 struct pcpu_sw_netstats *tstats = get_cpu_ptr(stats); 211 212 u64_stats_update_begin(&tstats->syncp); 213 tstats->tx_bytes += err; 214 tstats->tx_packets++; 215 u64_stats_update_end(&tstats->syncp); 216 put_cpu_ptr(tstats); 217 } else if (err < 0) { 218 err_stats->tx_errors++; 219 err_stats->tx_aborted_errors++; 220 } else { 221 err_stats->tx_dropped++; 222 } 223} 224 225#endif /* CONFIG_INET */ 226 227#endif /* __NET_IP_TUNNELS_H */ 228