linux/include/net/ipip.h
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   1#ifndef __NET_IPIP_H
   2#define __NET_IPIP_H 1
   3
   4#include <linux/if_tunnel.h>
   5#include <net/gro_cells.h>
   6#include <net/ip.h>
   7
   8/* Keep error state on tunnel for 30 sec */
   9#define IPTUNNEL_ERR_TIMEO      (30*HZ)
  10
  11/* 6rd prefix/relay information */
  12struct ip_tunnel_6rd_parm {
  13        struct in6_addr         prefix;
  14        __be32                  relay_prefix;
  15        u16                     prefixlen;
  16        u16                     relay_prefixlen;
  17};
  18
  19struct ip_tunnel {
  20        struct ip_tunnel __rcu  *next;
  21        struct net_device       *dev;
  22
  23        int                     err_count;      /* Number of arrived ICMP errors */
  24        unsigned long           err_time;       /* Time when the last ICMP error arrived */
  25
  26        /* These four fields used only by GRE */
  27        __u32                   i_seqno;        /* The last seen seqno  */
  28        __u32                   o_seqno;        /* The last output seqno */
  29        int                     hlen;           /* Precalculated GRE header length */
  30        int                     mlink;
  31
  32        struct ip_tunnel_parm   parms;
  33
  34        /* for SIT */
  35#ifdef CONFIG_IPV6_SIT_6RD
  36        struct ip_tunnel_6rd_parm       ip6rd;
  37#endif
  38        struct ip_tunnel_prl_entry __rcu *prl;          /* potential router list */
  39        unsigned int                    prl_count;      /* # of entries in PRL */
  40
  41        struct gro_cells                gro_cells;
  42};
  43
  44struct ip_tunnel_prl_entry {
  45        struct ip_tunnel_prl_entry __rcu *next;
  46        __be32                          addr;
  47        u16                             flags;
  48        struct rcu_head                 rcu_head;
  49};
  50
  51#define __IPTUNNEL_XMIT(stats1, stats2) do {                            \
  52        int err;                                                        \
  53        int pkt_len = skb->len - skb_transport_offset(skb);             \
  54                                                                        \
  55        skb->ip_summed = CHECKSUM_NONE;                                 \
  56        ip_select_ident(iph, &rt->dst, NULL);                           \
  57                                                                        \
  58        err = ip_local_out(skb);                                        \
  59        if (likely(net_xmit_eval(err) == 0)) {                          \
  60                u64_stats_update_begin(&(stats1)->syncp);               \
  61                (stats1)->tx_bytes += pkt_len;                          \
  62                (stats1)->tx_packets++;                                 \
  63                u64_stats_update_end(&(stats1)->syncp);                 \
  64        } else {                                                        \
  65                (stats2)->tx_errors++;                                  \
  66                (stats2)->tx_aborted_errors++;                          \
  67        }                                                               \
  68} while (0)
  69
  70#define IPTUNNEL_XMIT() __IPTUNNEL_XMIT(txq, stats)
  71
  72#endif
  73
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