root/include/net/ip6_tunnel.h

INCLUDED FROM

DEFINITIONS

1. ip6tunnel_xmit

#ifndef _NET_IP6_TUNNEL_H
#define _NET_IP6_TUNNEL_H

#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <linux/if_tunnel.h>
#include <linux/ip6_tunnel.h>

#define IP6TUNNEL_ERR_TIMEO (30*HZ)

/* capable of sending packets */
#define IP6_TNL_F_CAP_XMIT 0x10000
/* capable of receiving packets */
#define IP6_TNL_F_CAP_RCV 0x20000
/* determine capability on a per-packet basis */
#define IP6_TNL_F_CAP_PER_PACKET 0x40000

struct __ip6_tnl_parm {
        char name[IFNAMSIZ];    /* name of tunnel device */
        int link;               /* ifindex of underlying L2 interface */
        __u8 proto;             /* tunnel protocol */
        __u8 encap_limit;       /* encapsulation limit for tunnel */
        __u8 hop_limit;         /* hop limit for tunnel */
        __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
        __u32 flags;            /* tunnel flags */
        struct in6_addr laddr;  /* local tunnel end-point address */
        struct in6_addr raddr;  /* remote tunnel end-point address */

        __be16                  i_flags;
        __be16                  o_flags;
        __be32                  i_key;
        __be32                  o_key;
};

/* IPv6 tunnel */
struct ip6_tnl {
        struct ip6_tnl __rcu *next;     /* next tunnel in list */
        struct net_device *dev; /* virtual device associated with tunnel */
        struct net *net;        /* netns for packet i/o */
        struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
        struct flowi fl;        /* flowi template for xmit */
        struct dst_entry *dst_cache;    /* cached dst */
        u32 dst_cookie;

        int err_count;
        unsigned long err_time;

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

/* Tunnel encapsulation limit destination sub-option */

struct ipv6_tlv_tnl_enc_lim {
        __u8 type;              /* type-code for option         */
        __u8 length;            /* option length                */
        __u8 encap_limit;       /* tunnel encapsulation limit   */
} __packed;

struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
void ip6_tnl_dst_reset(struct ip6_tnl *t);
void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
                const struct in6_addr *raddr);
int ip6_tnl_xmit_ctl(struct ip6_tnl *t);
__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
                             const struct in6_addr *raddr);

static inline void ip6tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct net_device_stats *stats = &dev->stats;
        int pkt_len, err;

        pkt_len = skb->len;
        err = ip6_local_out(skb);

        if (net_xmit_eval(err) == 0) {
                struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
                u64_stats_update_begin(&tstats->syncp);
                tstats->tx_bytes += pkt_len;
                tstats->tx_packets++;
                u64_stats_update_end(&tstats->syncp);
        } else {
                stats->tx_errors++;
                stats->tx_aborted_errors++;
        }
}
#endif