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
23#define IPTUNNEL_ERR_TIMEO (30*HZ)
24
25
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;
59
60 int err_count;
61 unsigned long err_time;
62
63
64
65 __u32 i_seqno;
66 __u32 o_seqno;
67 int tun_hlen;
68 int mlink;
69
70 struct ip_tunnel_dst __percpu *dst_cache;
71
72 struct ip_tunnel_parm parms;
73
74 int encap_hlen;
75 struct ip_tunnel_encap encap;
76
77 int hlen;
78
79
80#ifdef CONFIG_IPV6_SIT_6RD
81 struct ip_tunnel_6rd_parm ip6rd;
82#endif
83 struct ip_tunnel_prl_entry __rcu *prl;
84 unsigned int prl_count;
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_OPTIONS_PRESENT __cpu_to_be16(0x0800)
101
102struct tnl_ptk_info {
103 __be16 flags;
104 __be16 proto;
105 __be32 key;
106 __be32 seq;
107};
108
109#define PACKET_RCVD 0
110#define PACKET_REJECT 1
111
112#define IP_TNL_HASH_BITS 7
113#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
114
115struct ip_tunnel_net {
116 struct net_device *fb_tunnel_dev;
117 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
118};
119
120struct ip_tunnel_encap_ops {
121 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
122 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
123 u8 *protocol, struct flowi4 *fl4);
124};
125
126#define MAX_IPTUN_ENCAP_OPS 8
127
128extern const struct ip_tunnel_encap_ops __rcu *
129 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
130
131int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
132 unsigned int num);
133int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
134 unsigned int num);
135
136#ifdef CONFIG_INET
137
138int ip_tunnel_init(struct net_device *dev);
139void ip_tunnel_uninit(struct net_device *dev);
140void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
141int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
142 struct rtnl_link_ops *ops, char *devname);
143
144void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
145
146void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
147 const struct iphdr *tnl_params, const u8 protocol);
148int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
149int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
150 u8 *protocol, struct flowi4 *fl4);
151int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
152
153struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
154 struct rtnl_link_stats64 *tot);
155struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
156 int link, __be16 flags,
157 __be32 remote, __be32 local,
158 __be32 key);
159
160int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
161 const struct tnl_ptk_info *tpi, bool log_ecn_error);
162int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
163 struct ip_tunnel_parm *p);
164int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
165 struct ip_tunnel_parm *p);
166void ip_tunnel_setup(struct net_device *dev, int net_id);
167void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
168int ip_tunnel_encap_setup(struct ip_tunnel *t,
169 struct ip_tunnel_encap *ipencap);
170
171
172static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
173 const struct sk_buff *skb)
174{
175 if (skb->protocol == htons(ETH_P_IP))
176 return iph->tos;
177 else if (skb->protocol == htons(ETH_P_IPV6))
178 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
179 else
180 return 0;
181}
182
183
184static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
185 const struct sk_buff *skb)
186{
187 u8 inner = ip_tunnel_get_dsfield(iph, skb);
188
189 return INET_ECN_encapsulate(tos, inner);
190}
191
192int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
193int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
194 __be32 src, __be32 dst, __u8 proto,
195 __u8 tos, __u8 ttl, __be16 df, bool xnet);
196
197struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
198 int gso_type_mask);
199
200static inline void iptunnel_xmit_stats(int err,
201 struct net_device_stats *err_stats,
202 struct pcpu_sw_netstats __percpu *stats)
203{
204 if (err > 0) {
205 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
206
207 u64_stats_update_begin(&tstats->syncp);
208 tstats->tx_bytes += err;
209 tstats->tx_packets++;
210 u64_stats_update_end(&tstats->syncp);
211 } else if (err < 0) {
212 err_stats->tx_errors++;
213 err_stats->tx_aborted_errors++;
214 } else {
215 err_stats->tx_dropped++;
216 }
217}
218
219#endif
220
221#endif
222
