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 sock *sk, 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 */