include/net/ip_tunnels.h

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This source file includes following definitions.
ip_tunnel_get_dsfield
ip_tunnel_ecn_encap
iptunnel_xmit_stats
#ifndef __NET_IP_TUNNELS_H
#define __NET_IP_TUNNELS_H 1

#include <linux/if_tunnel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/u64_stats_sync.h>
#include <net/dsfield.h>
#include <net/gro_cells.h>
#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>

#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#endif

/* Keep error state on tunnel for 30 sec */
#define IPTUNNEL_ERR_TIMEO      (30*HZ)

/* 6rd prefix/relay information */
#ifdef CONFIG_IPV6_SIT_6RD
struct ip_tunnel_6rd_parm {
        struct in6_addr         prefix;
        __be32                  relay_prefix;
        u16                     prefixlen;
        u16                     relay_prefixlen;
};
#endif

struct ip_tunnel_encap {
        __u16                   type;
        __u16                   flags;
        __be16                  sport;
        __be16                  dport;
};

struct ip_tunnel_prl_entry {
        struct ip_tunnel_prl_entry __rcu *next;
        __be32                          addr;
        u16                             flags;
        struct rcu_head                 rcu_head;
};

struct ip_tunnel_dst {
        struct dst_entry __rcu          *dst;
        __be32                           saddr;
};

struct ip_tunnel {
        struct ip_tunnel __rcu  *next;
        struct hlist_node hash_node;
        struct net_device       *dev;
        struct net              *net;   /* netns for packet i/o */

        int             err_count;      /* Number of arrived ICMP errors */
        unsigned long   err_time;       /* Time when the last ICMP error
                                         * arrived */

        /* These four fields used only by GRE */
        __u32           i_seqno;        /* The last seen seqno  */
        __u32           o_seqno;        /* The last output seqno */
        int             tun_hlen;       /* Precalculated header length */
        int             mlink;

        struct ip_tunnel_dst __percpu *dst_cache;

        struct ip_tunnel_parm parms;

        int             encap_hlen;     /* Encap header length (FOU,GUE) */
        struct ip_tunnel_encap encap;

        int             hlen;           /* tun_hlen + encap_hlen */

        /* for SIT */
#ifdef CONFIG_IPV6_SIT_6RD
        struct ip_tunnel_6rd_parm ip6rd;
#endif
        struct ip_tunnel_prl_entry __rcu *prl;  /* potential router list */
        unsigned int            prl_count;      /* # of entries in PRL */
        int                     ip_tnl_net_id;
        struct gro_cells        gro_cells;
};

#define TUNNEL_CSUM             __cpu_to_be16(0x01)
#define TUNNEL_ROUTING          __cpu_to_be16(0x02)
#define TUNNEL_KEY              __cpu_to_be16(0x04)
#define TUNNEL_SEQ              __cpu_to_be16(0x08)
#define TUNNEL_STRICT           __cpu_to_be16(0x10)
#define TUNNEL_REC              __cpu_to_be16(0x20)
#define TUNNEL_VERSION          __cpu_to_be16(0x40)
#define TUNNEL_NO_KEY           __cpu_to_be16(0x80)
#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
#define TUNNEL_OAM              __cpu_to_be16(0x0200)
#define TUNNEL_CRIT_OPT         __cpu_to_be16(0x0400)
#define TUNNEL_OPTIONS_PRESENT  __cpu_to_be16(0x0800)

struct tnl_ptk_info {
        __be16 flags;
        __be16 proto;
        __be32 key;
        __be32 seq;
};

#define PACKET_RCVD     0
#define PACKET_REJECT   1

#define IP_TNL_HASH_BITS   7
#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)

struct ip_tunnel_net {
        struct net_device *fb_tunnel_dev;
        struct hlist_head tunnels[IP_TNL_HASH_SIZE];
};

#ifdef CONFIG_INET

int ip_tunnel_init(struct net_device *dev);
void ip_tunnel_uninit(struct net_device *dev);
void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
                       struct rtnl_link_ops *ops, char *devname);

void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);

void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                    const struct iphdr *tnl_params, const u8 protocol);
int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
                    u8 *protocol, struct flowi4 *fl4);
int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);

struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
                                                struct rtnl_link_stats64 *tot);
struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
                                   int link, __be16 flags,
                                   __be32 remote, __be32 local,
                                   __be32 key);

int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
                  const struct tnl_ptk_info *tpi, bool log_ecn_error);
int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
                         struct ip_tunnel_parm *p);
int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
                      struct ip_tunnel_parm *p);
void ip_tunnel_setup(struct net_device *dev, int net_id);
void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
int ip_tunnel_encap_setup(struct ip_tunnel *t,
                          struct ip_tunnel_encap *ipencap);

/* Extract dsfield from inner protocol */
static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
                                       const struct sk_buff *skb)
{
        if (skb->protocol == htons(ETH_P_IP))
                return iph->tos;
        else if (skb->protocol == htons(ETH_P_IPV6))
                return ipv6_get_dsfield((const struct ipv6hdr *)iph);
        else
                return 0;
}

/* Propogate ECN bits out */
static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
                                     const struct sk_buff *skb)
{
        u8 inner = ip_tunnel_get_dsfield(iph, skb);

        return INET_ECN_encapsulate(tos, inner);
}

int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
                  __be32 src, __be32 dst, __u8 proto,
                  __u8 tos, __u8 ttl, __be16 df, bool xnet);

struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
                                         int gso_type_mask);

static inline void iptunnel_xmit_stats(int err,
                                       struct net_device_stats *err_stats,
                                       struct pcpu_sw_netstats __percpu *stats)
{
        if (err > 0) {
                struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);

                u64_stats_update_begin(&tstats->syncp);
                tstats->tx_bytes += err;
                tstats->tx_packets++;
                u64_stats_update_end(&tstats->syncp);
        } else if (err < 0) {
                err_stats->tx_errors++;
                err_stats->tx_aborted_errors++;
        } else {
                err_stats->tx_dropped++;
        }
}

#endif /* CONFIG_INET */

#endif /* __NET_IP_TUNNELS_H */
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root/include/net/ip_tunnels.h

INCLUDED FROM

DEFINITIONS
