include/net/ipip.h

   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 */
  12 struct ip_tunnel_6rd_parm {
  13         struct in6_addr         prefix;
  14         __be32                  relay_prefix;
  15         u16                     prefixlen;
  16         u16                     relay_prefixlen;
  17 };
  18
  19 struct 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
  44 struct 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 static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
  52 {
  53         int err;
  54         struct iphdr *iph = ip_hdr(skb);
  55         int pkt_len = skb->len - skb_transport_offset(skb);
  56         struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
  57
  58         nf_reset(skb);
  59         skb->ip_summed = CHECKSUM_NONE;
  60         ip_select_ident(iph, skb_dst(skb), NULL);
  61
  62         err = ip_local_out(skb);
  63         if (likely(net_xmit_eval(err) == 0)) {
  64                 u64_stats_update_begin(&tstats->syncp);
  65                 tstats->tx_bytes += pkt_len;
  66                 tstats->tx_packets++;
  67                 u64_stats_update_end(&tstats->syncp);
  68         } else {
  69                 dev->stats.tx_errors++;
  70                 dev->stats.tx_aborted_errors++;
  71         }
  72 }
  73
  74 static inline void tunnel_ip_select_ident(struct sk_buff *skb,
  75                                           const struct iphdr  *old_iph,
  76                                           struct dst_entry *dst)
  77 {
  78         struct iphdr *iph = ip_hdr(skb);
  79
  80         if (iph->frag_off & htons(IP_DF))
  81                 iph->id = 0;
  82         else {
  83                 /* Use inner packet iph-id if possible. */
  84                 if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
  85                         iph->id = old_iph->id;
  86                 else
  87                         __ip_select_ident(iph, dst,
  88                                           (skb_shinfo(skb)->gso_segs ?: 1) - 1);
  89         }
  90 }
  91 #endif