1 #ifndef _NET_IP6_TUNNEL_H 2 #define _NET_IP6_TUNNEL_H 3 4 #include <linux/ipv6.h> 5 #include <linux/netdevice.h> 6 #include <linux/if_tunnel.h> 7 #include <linux/ip6_tunnel.h> 8 9 #define IP6TUNNEL_ERR_TIMEO (30*HZ) 10 11 /* capable of sending packets */ 12 #define IP6_TNL_F_CAP_XMIT 0x10000 13 /* capable of receiving packets */ 14 #define IP6_TNL_F_CAP_RCV 0x20000 15 /* determine capability on a per-packet basis */ 16 #define IP6_TNL_F_CAP_PER_PACKET 0x40000 17 18 struct __ip6_tnl_parm { 19 char name[IFNAMSIZ]; /* name of tunnel device */ 20 int link; /* ifindex of underlying L2 interface */ 21 __u8 proto; /* tunnel protocol */ 22 __u8 encap_limit; /* encapsulation limit for tunnel */ 23 __u8 hop_limit; /* hop limit for tunnel */ 24 __be32 flowinfo; /* traffic class and flowlabel for tunnel */ 25 __u32 flags; /* tunnel flags */ 26 struct in6_addr laddr; /* local tunnel end-point address */ 27 struct in6_addr raddr; /* remote tunnel end-point address */ 28 29 __be16 i_flags; 30 __be16 o_flags; 31 __be32 i_key; 32 __be32 o_key; 33 }; 34 35 struct ip6_tnl_dst { 36 seqlock_t lock; 37 struct dst_entry __rcu *dst; 38 u32 cookie; 39 }; 40 41 /* IPv6 tunnel */ 42 struct ip6_tnl { 43 struct ip6_tnl __rcu *next; /* next tunnel in list */ 44 struct net_device *dev; /* virtual device associated with tunnel */ 45 struct net *net; /* netns for packet i/o */ 46 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 47 struct flowi fl; /* flowi template for xmit */ 48 struct ip6_tnl_dst __percpu *dst_cache; /* cached dst */ 49 50 int err_count; 51 unsigned long err_time; 52 53 /* These fields used only by GRE */ 54 __u32 i_seqno; /* The last seen seqno */ 55 __u32 o_seqno; /* The last output seqno */ 56 int hlen; /* Precalculated GRE header length */ 57 int mlink; 58 }; 59 60 /* Tunnel encapsulation limit destination sub-option */ 61 62 struct ipv6_tlv_tnl_enc_lim { 63 __u8 type; /* type-code for option */ 64 __u8 length; /* option length */ 65 __u8 encap_limit; /* tunnel encapsulation limit */ 66 } __packed; 67 68 struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t); 69 int ip6_tnl_dst_init(struct ip6_tnl *t); 70 void ip6_tnl_dst_destroy(struct ip6_tnl *t); 71 void ip6_tnl_dst_reset(struct ip6_tnl *t); 72 void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst); 73 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 74 const struct in6_addr *raddr); 75 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 76 const struct in6_addr *raddr); 77 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 78 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 79 const struct in6_addr *raddr); 80 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 81 int ip6_tnl_get_iflink(const struct net_device *dev); 82 83 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 84 struct net_device *dev) 85 { 86 struct net_device_stats *stats = &dev->stats; 87 int pkt_len, err; 88 89 pkt_len = skb->len - skb_inner_network_offset(skb); 90 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 91 92 if (net_xmit_eval(err) == 0) { 93 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 94 u64_stats_update_begin(&tstats->syncp); 95 tstats->tx_bytes += pkt_len; 96 tstats->tx_packets++; 97 u64_stats_update_end(&tstats->syncp); 98 put_cpu_ptr(tstats); 99 } else { 100 stats->tx_errors++; 101 stats->tx_aborted_errors++; 102 } 103 } 104 #endif 105