tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_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
120#ifdef CONFIG_INET
121
122int ip_tunnel_init(struct net_device *dev);
123void ip_tunnel_uninit(struct net_device *dev);
124void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
125int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
126 struct rtnl_link_ops *ops, char *devname);
127
128void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
129
130void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
131 const struct iphdr *tnl_params, const u8 protocol);
132int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
133int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
134 u8 *protocol, struct flowi4 *fl4);
135int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
136
137struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
138 struct rtnl_link_stats64 *tot);
139struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
140 int link, __be16 flags,
141 __be32 remote, __be32 local,
142 __be32 key);
143
144int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
145 const struct tnl_ptk_info *tpi, bool log_ecn_error);
146int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
147 struct ip_tunnel_parm *p);
148int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
149 struct ip_tunnel_parm *p);
150void ip_tunnel_setup(struct net_device *dev, int net_id);
151void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
152int ip_tunnel_encap_setup(struct ip_tunnel *t,
153 struct ip_tunnel_encap *ipencap);
154
155/* Extract dsfield from inner protocol */
156static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
157 const struct sk_buff *skb)
158{
159 if (skb->protocol == htons(ETH_P_IP))
160 return iph->tos;
161 else if (skb->protocol == htons(ETH_P_IPV6))
162 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
163 else
164 return 0;
165}
166
167/* Propogate ECN bits out */
168static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
169 const struct sk_buff *skb)
170{
171 u8 inner = ip_tunnel_get_dsfield(iph, skb);
172
173 return INET_ECN_encapsulate(tos, inner);
174}
175
176int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
177int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
178 __be32 src, __be32 dst, __u8 proto,
179 __u8 tos, __u8 ttl, __be16 df, bool xnet);
180
181struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
182 int gso_type_mask);
183
184static inline void iptunnel_xmit_stats(int err,
185 struct net_device_stats *err_stats,
186 struct pcpu_sw_netstats __percpu *stats)
187{
188 if (err > 0) {
189 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
190
191 u64_stats_update_begin(&tstats->syncp);
192 tstats->tx_bytes += err;
193 tstats->tx_packets++;
194 u64_stats_update_end(&tstats->syncp);
195 } else if (err < 0) {
196 err_stats->tx_errors++;
197 err_stats->tx_aborted_errors++;
198 } else {
199 err_stats->tx_dropped++;
200 }
201}
202
203#endif /* CONFIG_INET */
204
205#endif /* __NET_IP_TUNNELS_H */