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/rtnetlink.h>
14
15#if IS_ENABLED(CONFIG_IPV6)
16#include <net/ipv6.h>
17#include <net/ip6_fib.h>
18#include <net/ip6_route.h>
19#endif
20
21/* Keep error state on tunnel for 30 sec */
22#define IPTUNNEL_ERR_TIMEO (30*HZ)
23
24/* 6rd prefix/relay information */
25#ifdef CONFIG_IPV6_SIT_6RD
26struct ip_tunnel_6rd_parm {
27 struct in6_addr prefix;
28 __be32 relay_prefix;
29 u16 prefixlen;
30 u16 relay_prefixlen;
31};
32#endif
33
34struct ip_tunnel_prl_entry {
35 struct ip_tunnel_prl_entry __rcu *next;
36 __be32 addr;
37 u16 flags;
38 struct rcu_head rcu_head;
39};
40
41struct ip_tunnel_dst {
42 struct dst_entry __rcu *dst;
43};
44
45struct ip_tunnel {
46 struct ip_tunnel __rcu *next;
47 struct hlist_node hash_node;
48 struct net_device *dev;
49 struct net *net; /* netns for packet i/o */
50
51 int err_count; /* Number of arrived ICMP errors */
52 unsigned long err_time; /* Time when the last ICMP error
53 * arrived */
54
55 /* These four fields used only by GRE */
56 __u32 i_seqno; /* The last seen seqno */
57 __u32 o_seqno; /* The last output seqno */
58 int hlen; /* Precalculated header length */
59 int mlink;
60
61 struct ip_tunnel_dst __percpu *dst_cache;
62
63 struct ip_tunnel_parm parms;
64
65 /* for SIT */
66#ifdef CONFIG_IPV6_SIT_6RD
67 struct ip_tunnel_6rd_parm ip6rd;
68#endif
69 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
70 unsigned int prl_count; /* # of entries in PRL */
71 int ip_tnl_net_id;
72 struct gro_cells gro_cells;
73};
74
75#define TUNNEL_CSUM __cpu_to_be16(0x01)
76#define TUNNEL_ROUTING __cpu_to_be16(0x02)
77#define TUNNEL_KEY __cpu_to_be16(0x04)
78#define TUNNEL_SEQ __cpu_to_be16(0x08)
79#define TUNNEL_STRICT __cpu_to_be16(0x10)
80#define TUNNEL_REC __cpu_to_be16(0x20)
81#define TUNNEL_VERSION __cpu_to_be16(0x40)
82#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
83#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
84
85struct tnl_ptk_info {
86 __be16 flags;
87 __be16 proto;
88 __be32 key;
89 __be32 seq;
90};
91
92#define PACKET_RCVD 0
93#define PACKET_REJECT 1
94
95#define IP_TNL_HASH_BITS 7
96#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
97
98struct ip_tunnel_net {
99 struct net_device *fb_tunnel_dev;
100 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
101};
102
103#ifdef CONFIG_INET
104
105int ip_tunnel_init(struct net_device *dev);
106void ip_tunnel_uninit(struct net_device *dev);
107void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
108int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
109 struct rtnl_link_ops *ops, char *devname);
110
111void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
112
113void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
114 const struct iphdr *tnl_params, const u8 protocol);
115int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
116int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
117
118struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
119 struct rtnl_link_stats64 *tot);
120struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
121 int link, __be16 flags,
122 __be32 remote, __be32 local,
123 __be32 key);
124
125int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
126 const struct tnl_ptk_info *tpi, bool log_ecn_error);
127int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
128 struct ip_tunnel_parm *p);
129int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
130 struct ip_tunnel_parm *p);
131void ip_tunnel_setup(struct net_device *dev, int net_id);
132void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
133
134/* Extract dsfield from inner protocol */
135static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
136 const struct sk_buff *skb)
137{
138 if (skb->protocol == htons(ETH_P_IP))
139 return iph->tos;
140 else if (skb->protocol == htons(ETH_P_IPV6))
141 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
142 else
143 return 0;
144}
145
146/* Propogate ECN bits out */
147static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
148 const struct sk_buff *skb)
149{
150 u8 inner = ip_tunnel_get_dsfield(iph, skb);
151
152 return INET_ECN_encapsulate(tos, inner);
153}
154
155int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
156int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
157 __be32 src, __be32 dst, __u8 proto,
158 __u8 tos, __u8 ttl, __be16 df, bool xnet);
159
160struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
161 int gso_type_mask);
162
163static inline void iptunnel_xmit_stats(int err,
164 struct net_device_stats *err_stats,
165 struct pcpu_sw_netstats __percpu *stats)
166{
167 if (err > 0) {
168 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
169
170 u64_stats_update_begin(&tstats->syncp);
171 tstats->tx_bytes += err;
172 tstats->tx_packets++;
173 u64_stats_update_end(&tstats->syncp);
174 } else if (err < 0) {
175 err_stats->tx_errors++;
176 err_stats->tx_aborted_errors++;
177 } else {
178 err_stats->tx_dropped++;
179 }
180}
181
182#endif /* CONFIG_INET */
183
184#endif /* __NET_IP_TUNNELS_H */