blob: a4daf9eb856285a2b7c831ee04d4e75a39957142 [file] [log] [blame]
Pravin B Shelarc5441932013-03-25 14:49:35 +00001#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
Tom Herbert9a4aa9a2014-01-02 11:48:33 -080041struct ip_tunnel_dst {
42 struct dst_entry __rcu *dst;
Tom Herbert9a4aa9a2014-01-02 11:48:33 -080043};
44
Pravin B Shelarc5441932013-03-25 14:49:35 +000045struct ip_tunnel {
46 struct ip_tunnel __rcu *next;
47 struct hlist_node hash_node;
48 struct net_device *dev;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +020049 struct net *net; /* netns for packet i/o */
Pravin B Shelarc5441932013-03-25 14:49:35 +000050
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
Tom Herbert9a4aa9a2014-01-02 11:48:33 -080061 struct ip_tunnel_dst __percpu *dst_cache;
Tom Herbert7d442fa2014-01-02 11:48:26 -080062
Pravin B Shelarc5441932013-03-25 14:49:35 +000063 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)
Pravin B Shelar9a628222013-06-17 17:50:07 -070083#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
Pravin B Shelarc5441932013-03-25 14:49:35 +000084
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
stephen hemminger6261d982013-08-05 22:51:37 -070095#define IP_TNL_HASH_BITS 7
Pravin B Shelarc5441932013-03-25 14:49:35 +000096#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
97
98struct ip_tunnel_net {
Pravin B Shelarc5441932013-03-25 14:49:35 +000099 struct net_device *fb_tunnel_dev;
stephen hemminger6261d982013-08-05 22:51:37 -0700100 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
Pravin B Shelarc5441932013-03-25 14:49:35 +0000101};
102
Jesse Gross5243b6a2013-06-21 16:17:11 -0700103#ifdef CONFIG_INET
104
Pravin B Shelarc5441932013-03-25 14:49:35 +0000105int 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);
Eric Dumazetd3b6f612013-06-07 13:26:05 -0700108int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
109 struct rtnl_link_ops *ops, char *devname);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000110
Nicolas Dichtel6c742e72013-08-13 17:51:11 +0200111void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000112
113void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
Nicolas Dichtelbf3d6a82013-05-27 23:48:15 +0000114 const struct iphdr *tnl_params, const u8 protocol);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000115int 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);
Nicolas Dichtelcf71d2bc2014-02-20 10:19:31 +0100132void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000133
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
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700155int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
Eric Dumazetaad88722014-04-15 13:47:15 -0400156int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700157 __be32 src, __be32 dst, __u8 proto,
Nicolas Dichtel963a88b2013-09-02 15:34:57 +0200158 __u8 tos, __u8 ttl, __be16 df, bool xnet);
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700159
Eric Dumazet2d26f0a2013-10-19 11:42:55 -0700160struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
161 int gso_type_mask);
162
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700163static inline void iptunnel_xmit_stats(int err,
164 struct net_device_stats *err_stats,
Li RongQing8f849852014-01-04 13:57:59 +0800165 struct pcpu_sw_netstats __percpu *stats)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000166{
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700167 if (err > 0) {
Li RongQing8f849852014-01-04 13:57:59 +0800168 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000169
Pravin B Shelarc5441932013-03-25 14:49:35 +0000170 u64_stats_update_begin(&tstats->syncp);
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700171 tstats->tx_bytes += err;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000172 tstats->tx_packets++;
173 u64_stats_update_end(&tstats->syncp);
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700174 } else if (err < 0) {
175 err_stats->tx_errors++;
176 err_stats->tx_aborted_errors++;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000177 } else {
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700178 err_stats->tx_dropped++;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000179 }
180}
Jesse Gross5243b6a2013-06-21 16:17:11 -0700181
182#endif /* CONFIG_INET */
183
Pravin B Shelarc5441932013-03-25 14:49:35 +0000184#endif /* __NET_IP_TUNNELS_H */