blob: 4b6f0b28f41f097153669aa6194deae952ea58ff [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
41struct ip_tunnel {
42 struct ip_tunnel __rcu *next;
43 struct hlist_node hash_node;
44 struct net_device *dev;
45
46 int err_count; /* Number of arrived ICMP errors */
47 unsigned long err_time; /* Time when the last ICMP error
48 * arrived */
49
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 */
54 int mlink;
55
56 struct ip_tunnel_parm parms;
57
58 /* for SIT */
59#ifdef CONFIG_IPV6_SIT_6RD
60 struct ip_tunnel_6rd_parm ip6rd;
61#endif
62 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
63 unsigned int prl_count; /* # of entries in PRL */
64 int ip_tnl_net_id;
65 struct gro_cells gro_cells;
66};
67
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
77struct tnl_ptk_info {
78 __be16 flags;
79 __be16 proto;
80 __be32 key;
81 __be32 seq;
82};
83
84#define PACKET_RCVD 0
85#define PACKET_REJECT 1
86
87#define IP_TNL_HASH_BITS 10
88#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
89
90struct ip_tunnel_net {
91 struct hlist_head *tunnels;
92 struct net_device *fb_tunnel_dev;
93};
94
95int ip_tunnel_init(struct net_device *dev);
96void ip_tunnel_uninit(struct net_device *dev);
97void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
98int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
99 struct rtnl_link_ops *ops, char *devname);
100
101void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn);
102
103void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
104 const struct iphdr *tnl_params);
105int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
106int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
107
108struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
109 struct rtnl_link_stats64 *tot);
110struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
111 int link, __be16 flags,
112 __be32 remote, __be32 local,
113 __be32 key);
114
115int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
116 const struct tnl_ptk_info *tpi, bool log_ecn_error);
117int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
118 struct ip_tunnel_parm *p);
119int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
120 struct ip_tunnel_parm *p);
121void ip_tunnel_setup(struct net_device *dev, int net_id);
122
123/* Extract dsfield from inner protocol */
124static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
125 const struct sk_buff *skb)
126{
127 if (skb->protocol == htons(ETH_P_IP))
128 return iph->tos;
129 else if (skb->protocol == htons(ETH_P_IPV6))
130 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
131 else
132 return 0;
133}
134
135/* Propogate ECN bits out */
136static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
137 const struct sk_buff *skb)
138{
139 u8 inner = ip_tunnel_get_dsfield(iph, skb);
140
141 return INET_ECN_encapsulate(tos, inner);
142}
143
144static inline void tunnel_ip_select_ident(struct sk_buff *skb,
145 const struct iphdr *old_iph,
146 struct dst_entry *dst)
147{
148 struct iphdr *iph = ip_hdr(skb);
149
150 /* Use inner packet iph-id if possible. */
151 if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
152 iph->id = old_iph->id;
153 else
154 __ip_select_ident(iph, dst,
155 (skb_shinfo(skb)->gso_segs ?: 1) - 1);
156}
157
158static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
159{
160 int err;
161 int pkt_len = skb->len - skb_transport_offset(skb);
162 struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
163
164 nf_reset(skb);
165
166 err = ip_local_out(skb);
167 if (likely(net_xmit_eval(err) == 0)) {
168 u64_stats_update_begin(&tstats->syncp);
169 tstats->tx_bytes += pkt_len;
170 tstats->tx_packets++;
171 u64_stats_update_end(&tstats->syncp);
172 } else {
173 dev->stats.tx_errors++;
174 dev->stats.tx_aborted_errors++;
175 }
176}
177#endif /* __NET_IP_TUNNELS_H */