Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
51static 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
74static 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 /* Use inner packet iph-id if possible. */
81 if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
82 iph->id = old_iph->id;
83 else
84 __ip_select_ident(iph, dst,
85 (skb_shinfo(skb)->gso_segs ?: 1) - 1);
86}
87#endif