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/rtnetlink.h>
15 #if IS_ENABLED(CONFIG_IPV6)
17 #include <net/ip6_fib.h>
18 #include <net/ip6_route.h>
21 /* Keep error state on tunnel for 30 sec */
22 #define IPTUNNEL_ERR_TIMEO (30*HZ)
24 /* 6rd prefix/relay information */
25 #ifdef CONFIG_IPV6_SIT_6RD
26 struct ip_tunnel_6rd_parm {
27 struct in6_addr prefix;
34 struct ip_tunnel_prl_entry {
35 struct ip_tunnel_prl_entry __rcu *next;
38 struct rcu_head rcu_head;
41 struct ip_tunnel_dst {
42 struct dst_entry __rcu *dst;
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 */
52 int err_count; /* Number of arrived ICMP errors */
53 unsigned long err_time; /* Time when the last ICMP error
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 */
62 struct ip_tunnel_dst __percpu *dst_cache;
64 struct ip_tunnel_parm parms;
67 #ifdef CONFIG_IPV6_SIT_6RD
68 struct ip_tunnel_6rd_parm ip6rd;
70 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
71 unsigned int prl_count; /* # of entries in PRL */
73 struct gro_cells gro_cells;
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)
94 #define PACKET_REJECT 1
96 #define IP_TNL_HASH_BITS 7
97 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
99 struct ip_tunnel_net {
100 struct net_device *fb_tunnel_dev;
101 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
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);
112 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
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);
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,
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);
135 /* Extract dsfield from inner protocol */
136 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
137 const struct sk_buff *skb)
139 if (skb->protocol == htons(ETH_P_IP))
141 else if (skb->protocol == htons(ETH_P_IPV6))
142 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
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)
151 u8 inner = ip_tunnel_get_dsfield(iph, skb);
153 return INET_ECN_encapsulate(tos, inner);
156 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
157 int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
158 __be32 src, __be32 dst, __u8 proto,
159 __u8 tos, __u8 ttl, __be16 df, bool xnet);
161 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
164 static inline void iptunnel_xmit_stats(int err,
165 struct net_device_stats *err_stats,
166 struct pcpu_sw_netstats __percpu *stats)
169 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
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++;
179 err_stats->tx_dropped++;
183 #endif /* CONFIG_INET */
185 #endif /* __NET_IP_TUNNELS_H */