diff options
Diffstat (limited to 'kernel/include/net/ip_tunnels.h')
| -rw-r--r-- | kernel/include/net/ip_tunnels.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/kernel/include/net/ip_tunnels.h b/kernel/include/net/ip_tunnels.h new file mode 100644 index 000000000..d8214cb88 --- /dev/null +++ b/kernel/include/net/ip_tunnels.h @@ -0,0 +1,226 @@ +#ifndef __NET_IP_TUNNELS_H +#define __NET_IP_TUNNELS_H 1 + +#include <linux/if_tunnel.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <linux/u64_stats_sync.h> +#include <net/dsfield.h> +#include <net/gro_cells.h> +#include <net/inet_ecn.h> +#include <net/ip.h> +#include <net/netns/generic.h> +#include <net/rtnetlink.h> + +#if IS_ENABLED(CONFIG_IPV6) +#include <net/ipv6.h> +#include <net/ip6_fib.h> +#include <net/ip6_route.h> +#endif + +/* Keep error state on tunnel for 30 sec */ +#define IPTUNNEL_ERR_TIMEO (30*HZ) + +/* 6rd prefix/relay information */ +#ifdef CONFIG_IPV6_SIT_6RD +struct ip_tunnel_6rd_parm { + struct in6_addr prefix; + __be32 relay_prefix; + u16 prefixlen; + u16 relay_prefixlen; +}; +#endif + +struct ip_tunnel_encap { + __u16 type; + __u16 flags; + __be16 sport; + __be16 dport; +}; + +struct ip_tunnel_prl_entry { + struct ip_tunnel_prl_entry __rcu *next; + __be32 addr; + u16 flags; + struct rcu_head rcu_head; +}; + +struct ip_tunnel_dst { + struct dst_entry __rcu *dst; + __be32 saddr; +}; + +struct ip_tunnel { + struct ip_tunnel __rcu *next; + struct hlist_node hash_node; + struct net_device *dev; + struct net *net; /* netns for packet i/o */ + + int err_count; /* Number of arrived ICMP errors */ + unsigned long err_time; /* Time when the last ICMP error + * arrived */ + + /* These four fields used only by GRE */ + __u32 i_seqno; /* The last seen seqno */ + __u32 o_seqno; /* The last output seqno */ + int tun_hlen; /* Precalculated header length */ + int mlink; + + struct ip_tunnel_dst __percpu *dst_cache; + + struct ip_tunnel_parm parms; + + int encap_hlen; /* Encap header length (FOU,GUE) */ + struct ip_tunnel_encap encap; + + int hlen; /* tun_hlen + encap_hlen */ + + /* for SIT */ +#ifdef CONFIG_IPV6_SIT_6RD + struct ip_tunnel_6rd_parm ip6rd; +#endif + struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ + unsigned int prl_count; /* # of entries in PRL */ + int ip_tnl_net_id; + struct gro_cells gro_cells; +}; + +#define TUNNEL_CSUM __cpu_to_be16(0x01) +#define TUNNEL_ROUTING __cpu_to_be16(0x02) +#define TUNNEL_KEY __cpu_to_be16(0x04) +#define TUNNEL_SEQ __cpu_to_be16(0x08) +#define TUNNEL_STRICT __cpu_to_be16(0x10) +#define TUNNEL_REC __cpu_to_be16(0x20) +#define TUNNEL_VERSION __cpu_to_be16(0x40) +#define TUNNEL_NO_KEY __cpu_to_be16(0x80) +#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) +#define TUNNEL_OAM __cpu_to_be16(0x0200) +#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) +#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) +#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) + +#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) + +struct tnl_ptk_info { + __be16 flags; + __be16 proto; + __be32 key; + __be32 seq; +}; + +#define PACKET_RCVD 0 +#define PACKET_REJECT 1 + +#define IP_TNL_HASH_BITS 7 +#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) + +struct ip_tunnel_net { + struct net_device *fb_tunnel_dev; + struct hlist_head tunnels[IP_TNL_HASH_SIZE]; +}; + +struct ip_tunnel_encap_ops { + size_t (*encap_hlen)(struct ip_tunnel_encap *e); + int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, + u8 *protocol, struct flowi4 *fl4); +}; + +#define MAX_IPTUN_ENCAP_OPS 8 + +extern const struct ip_tunnel_encap_ops __rcu * + iptun_encaps[MAX_IPTUN_ENCAP_OPS]; + +int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, + unsigned int num); +int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, + unsigned int num); + +#ifdef CONFIG_INET + +int ip_tunnel_init(struct net_device *dev); +void ip_tunnel_uninit(struct net_device *dev); +void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); +struct net *ip_tunnel_get_link_net(const struct net_device *dev); +int ip_tunnel_get_iflink(const struct net_device *dev); +int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, + struct rtnl_link_ops *ops, char *devname); + +void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); + +void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, + const struct iphdr *tnl_params, const u8 protocol); +int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); +int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, + u8 *protocol, struct flowi4 *fl4); +int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); + +struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *tot); +struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, + int link, __be16 flags, + __be32 remote, __be32 local, + __be32 key); + +int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, + const struct tnl_ptk_info *tpi, bool log_ecn_error); +int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], + struct ip_tunnel_parm *p); +int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], + struct ip_tunnel_parm *p); +void ip_tunnel_setup(struct net_device *dev, int net_id); +void ip_tunnel_dst_reset_all(struct ip_tunnel *t); +int ip_tunnel_encap_setup(struct ip_tunnel *t, + struct ip_tunnel_encap *ipencap); + +/* Extract dsfield from inner protocol */ +static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, + const struct sk_buff *skb) +{ + if (skb->protocol == htons(ETH_P_IP)) + return iph->tos; + else if (skb->protocol == htons(ETH_P_IPV6)) + return ipv6_get_dsfield((const struct ipv6hdr *)iph); + else + return 0; +} + +/* Propogate ECN bits out */ +static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, + const struct sk_buff *skb) +{ + u8 inner = ip_tunnel_get_dsfield(iph, skb); + + return INET_ECN_encapsulate(tos, inner); +} + +int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); +int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, + __be32 src, __be32 dst, __u8 proto, + __u8 tos, __u8 ttl, __be16 df, bool xnet); + +struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, + int gso_type_mask); + +static inline void iptunnel_xmit_stats(int err, + struct net_device_stats *err_stats, + struct pcpu_sw_netstats __percpu *stats) +{ + if (err > 0) { + struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); + + u64_stats_update_begin(&tstats->syncp); + tstats->tx_bytes += err; + tstats->tx_packets++; + u64_stats_update_end(&tstats->syncp); + } else if (err < 0) { + err_stats->tx_errors++; + err_stats->tx_aborted_errors++; + } else { + err_stats->tx_dropped++; + } +} + +#endif /* CONFIG_INET */ + +#endif /* __NET_IP_TUNNELS_H */ |