1 #ifndef __NET_IP_TUNNELS_H
2 #define __NET_IP_TUNNELS_H 1
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>
13 #include <net/netns/generic.h>
14 #include <net/rtnetlink.h>
16 #if IS_ENABLED(CONFIG_IPV6)
18 #include <net/ip6_fib.h>
19 #include <net/ip6_route.h>
22 /* Keep error state on tunnel for 30 sec */
23 #define IPTUNNEL_ERR_TIMEO (30*HZ)
25 /* 6rd prefix/relay information */
26 #ifdef CONFIG_IPV6_SIT_6RD
27 struct ip_tunnel_6rd_parm {
28 struct in6_addr prefix;
35 struct ip_tunnel_encap {
42 struct ip_tunnel_prl_entry {
43 struct ip_tunnel_prl_entry __rcu *next;
46 struct rcu_head rcu_head;
49 struct ip_tunnel_dst {
50 struct dst_entry __rcu *dst;
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 */
60 int err_count; /* Number of arrived ICMP errors */
61 unsigned long err_time; /* Time when the last ICMP error
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 */
70 struct ip_tunnel_dst __percpu *dst_cache;
72 struct ip_tunnel_parm parms;
74 int encap_hlen; /* Encap header length (FOU,GUE) */
75 struct ip_tunnel_encap encap;
77 int hlen; /* tun_hlen + encap_hlen */
80 #ifdef CONFIG_IPV6_SIT_6RD
81 struct ip_tunnel_6rd_parm ip6rd;
83 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
84 unsigned int prl_count; /* # of entries in PRL */
86 struct gro_cells gro_cells;
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)
103 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
105 struct tnl_ptk_info {
112 #define PACKET_RCVD 0
113 #define PACKET_REJECT 1
115 #define IP_TNL_HASH_BITS 7
116 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
118 struct ip_tunnel_net {
119 struct net_device *fb_tunnel_dev;
120 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
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);
129 #define MAX_IPTUN_ENCAP_OPS 8
131 extern const struct ip_tunnel_encap_ops __rcu *
132 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
134 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
136 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
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);
148 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
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);
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,
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);
175 /* Extract dsfield from inner protocol */
176 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
177 const struct sk_buff *skb)
179 if (skb->protocol == htons(ETH_P_IP))
181 else if (skb->protocol == htons(ETH_P_IPV6))
182 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
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)
191 u8 inner = ip_tunnel_get_dsfield(iph, skb);
193 return INET_ECN_encapsulate(tos, inner);
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);
201 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
204 static inline void iptunnel_xmit_stats(int err,
205 struct net_device_stats *err_stats,
206 struct pcpu_sw_netstats __percpu *stats)
209 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
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++;
219 err_stats->tx_dropped++;
223 #endif /* CONFIG_INET */
225 #endif /* __NET_IP_TUNNELS_H */