| #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_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 */ |