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;
42 struct ip_tunnel __rcu *next;
43 struct hlist_node hash_node;
44 struct net_device *dev;
46 int err_count; /* Number of arrived ICMP errors */
47 unsigned long err_time; /* Time when the last ICMP error
50 /* These four fields used only by GRE */
51 __u32 i_seqno; /* The last seen seqno */
52 __u32 o_seqno; /* The last output seqno */
53 int hlen; /* Precalculated header length */
56 struct ip_tunnel_parm parms;
59 #ifdef CONFIG_IPV6_SIT_6RD
60 struct ip_tunnel_6rd_parm ip6rd;
62 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
63 unsigned int prl_count; /* # of entries in PRL */
65 struct gro_cells gro_cells;
68 #define TUNNEL_CSUM __cpu_to_be16(0x01)
69 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
70 #define TUNNEL_KEY __cpu_to_be16(0x04)
71 #define TUNNEL_SEQ __cpu_to_be16(0x08)
72 #define TUNNEL_STRICT __cpu_to_be16(0x10)
73 #define TUNNEL_REC __cpu_to_be16(0x20)
74 #define TUNNEL_VERSION __cpu_to_be16(0x40)
75 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
76 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
86 #define PACKET_REJECT 1
88 #define IP_TNL_HASH_BITS 10
89 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
91 struct ip_tunnel_net {
92 struct hlist_head *tunnels;
93 struct net_device *fb_tunnel_dev;
96 int ip_tunnel_init(struct net_device *dev);
97 void ip_tunnel_uninit(struct net_device *dev);
98 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
99 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
100 struct rtnl_link_ops *ops, char *devname);
102 void ip_tunnel_delete_net(struct ip_tunnel_net *itn);
104 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
105 const struct iphdr *tnl_params, const u8 protocol);
106 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
107 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
109 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
110 struct rtnl_link_stats64 *tot);
111 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
112 int link, __be16 flags,
113 __be32 remote, __be32 local,
116 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
117 const struct tnl_ptk_info *tpi, bool log_ecn_error);
118 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
119 struct ip_tunnel_parm *p);
120 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
121 struct ip_tunnel_parm *p);
122 void ip_tunnel_setup(struct net_device *dev, int net_id);
124 /* Extract dsfield from inner protocol */
125 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
126 const struct sk_buff *skb)
128 if (skb->protocol == htons(ETH_P_IP))
130 else if (skb->protocol == htons(ETH_P_IPV6))
131 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
136 /* Propogate ECN bits out */
137 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
138 const struct sk_buff *skb)
140 u8 inner = ip_tunnel_get_dsfield(iph, skb);
142 return INET_ECN_encapsulate(tos, inner);
145 static inline void tunnel_ip_select_ident(struct sk_buff *skb,
146 const struct iphdr *old_iph,
147 struct dst_entry *dst)
149 struct iphdr *iph = ip_hdr(skb);
151 /* Use inner packet iph-id if possible. */
152 if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
153 iph->id = old_iph->id;
155 __ip_select_ident(iph, dst,
156 (skb_shinfo(skb)->gso_segs ?: 1) - 1);
159 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
160 int iptunnel_xmit(struct net *net, struct rtable *rt,
162 __be32 src, __be32 dst, __u8 proto,
163 __u8 tos, __u8 ttl, __be16 df);
165 static inline void iptunnel_xmit_stats(int err,
166 struct net_device_stats *err_stats,
167 struct pcpu_tstats __percpu *stats)
170 struct pcpu_tstats *tstats = this_cpu_ptr(stats);
172 u64_stats_update_begin(&tstats->syncp);
173 tstats->tx_bytes += err;
174 tstats->tx_packets++;
175 u64_stats_update_end(&tstats->syncp);
176 } else if (err < 0) {
177 err_stats->tx_errors++;
178 err_stats->tx_aborted_errors++;
180 err_stats->tx_dropped++;
183 #endif /* __NET_IP_TUNNELS_H */