fd19625ff99db290fd289b3caf18f32c9b72ffc3
[linux-3.10.git] / 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