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169 lines
5.0 KiB
169 lines
5.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _NET_IP6_TUNNEL_H |
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#define _NET_IP6_TUNNEL_H |
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#include <linux/ipv6.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_tunnel.h> |
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#include <linux/ip6_tunnel.h> |
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#include <net/ip_tunnels.h> |
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#include <net/dst_cache.h> |
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#define IP6TUNNEL_ERR_TIMEO (30*HZ) |
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/* capable of sending packets */ |
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#define IP6_TNL_F_CAP_XMIT 0x10000 |
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/* capable of receiving packets */ |
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#define IP6_TNL_F_CAP_RCV 0x20000 |
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/* determine capability on a per-packet basis */ |
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#define IP6_TNL_F_CAP_PER_PACKET 0x40000 |
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struct __ip6_tnl_parm { |
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char name[IFNAMSIZ]; /* name of tunnel device */ |
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int link; /* ifindex of underlying L2 interface */ |
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__u8 proto; /* tunnel protocol */ |
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__u8 encap_limit; /* encapsulation limit for tunnel */ |
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__u8 hop_limit; /* hop limit for tunnel */ |
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bool collect_md; |
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__be32 flowinfo; /* traffic class and flowlabel for tunnel */ |
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__u32 flags; /* tunnel flags */ |
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struct in6_addr laddr; /* local tunnel end-point address */ |
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struct in6_addr raddr; /* remote tunnel end-point address */ |
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__be16 i_flags; |
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__be16 o_flags; |
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__be32 i_key; |
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__be32 o_key; |
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__u32 fwmark; |
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__u32 index; /* ERSPAN type II index */ |
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__u8 erspan_ver; /* ERSPAN version */ |
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__u8 dir; /* direction */ |
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__u16 hwid; /* hwid */ |
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}; |
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/* IPv6 tunnel */ |
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struct ip6_tnl { |
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struct ip6_tnl __rcu *next; /* next tunnel in list */ |
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struct net_device *dev; /* virtual device associated with tunnel */ |
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struct net *net; /* netns for packet i/o */ |
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struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ |
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struct flowi fl; /* flowi template for xmit */ |
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struct dst_cache dst_cache; /* cached dst */ |
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struct gro_cells gro_cells; |
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int err_count; |
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unsigned long err_time; |
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/* These fields used only by GRE */ |
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__u32 i_seqno; /* The last seen seqno */ |
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__u32 o_seqno; /* The last output seqno */ |
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int hlen; /* tun_hlen + encap_hlen */ |
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int tun_hlen; /* Precalculated header length */ |
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int encap_hlen; /* Encap header length (FOU,GUE) */ |
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struct ip_tunnel_encap encap; |
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int mlink; |
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}; |
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struct ip6_tnl_encap_ops { |
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size_t (*encap_hlen)(struct ip_tunnel_encap *e); |
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int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, |
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u8 *protocol, struct flowi6 *fl6); |
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int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
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u8 type, u8 code, int offset, __be32 info); |
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}; |
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#ifdef CONFIG_INET |
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extern const struct ip6_tnl_encap_ops __rcu * |
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ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; |
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int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
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unsigned int num); |
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int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, |
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unsigned int num); |
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int ip6_tnl_encap_setup(struct ip6_tnl *t, |
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struct ip_tunnel_encap *ipencap); |
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static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) |
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{ |
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const struct ip6_tnl_encap_ops *ops; |
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int hlen = -EINVAL; |
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if (e->type == TUNNEL_ENCAP_NONE) |
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return 0; |
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if (e->type >= MAX_IPTUN_ENCAP_OPS) |
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return -EINVAL; |
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rcu_read_lock(); |
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ops = rcu_dereference(ip6tun_encaps[e->type]); |
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if (likely(ops && ops->encap_hlen)) |
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hlen = ops->encap_hlen(e); |
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rcu_read_unlock(); |
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return hlen; |
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} |
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static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, |
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u8 *protocol, struct flowi6 *fl6) |
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{ |
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const struct ip6_tnl_encap_ops *ops; |
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int ret = -EINVAL; |
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if (t->encap.type == TUNNEL_ENCAP_NONE) |
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return 0; |
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if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) |
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return -EINVAL; |
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rcu_read_lock(); |
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ops = rcu_dereference(ip6tun_encaps[t->encap.type]); |
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if (likely(ops && ops->build_header)) |
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ret = ops->build_header(skb, &t->encap, protocol, fl6); |
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rcu_read_unlock(); |
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return ret; |
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} |
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/* Tunnel encapsulation limit destination sub-option */ |
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struct ipv6_tlv_tnl_enc_lim { |
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__u8 type; /* type-code for option */ |
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__u8 length; /* option length */ |
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__u8 encap_limit; /* tunnel encapsulation limit */ |
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} __packed; |
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int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
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const struct in6_addr *raddr); |
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int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
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const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
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bool log_ecn_error); |
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int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
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const struct in6_addr *raddr); |
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int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
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struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); |
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__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); |
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__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, |
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const struct in6_addr *raddr); |
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struct net *ip6_tnl_get_link_net(const struct net_device *dev); |
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int ip6_tnl_get_iflink(const struct net_device *dev); |
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int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); |
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static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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int pkt_len, err; |
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memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
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pkt_len = skb->len - skb_inner_network_offset(skb); |
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err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); |
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if (dev) { |
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if (unlikely(net_xmit_eval(err))) |
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pkt_len = -1; |
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iptunnel_xmit_stats(dev, pkt_len); |
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} |
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} |
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#endif |
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#endif
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