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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/if_tunnel.h>#include <linux/netdevice.h>#include <linux/skbuff.h>#include <linux/socket.h>#include <linux/types.h>#include <linux/u64_stats_sync.h>#include <linux/bitops.h>
#include <net/dsfield.h>#include <net/flow.h>#include <net/gro_cells.h>#include <net/inet_dscp.h>#include <net/inet_ecn.h>#include <net/netns/generic.h>#include <net/rtnetlink.h>#include <net/lwtunnel.h>#include <net/dst_cache.h>#include <net/netdev_lock.h>
#if IS_ENABLED(CONFIG_IPV6)#include <net/ipv6.h>#include <net/ip6_fib.h>#include <net/ip6_route.h>#endif
/* Recursion limit for tunnel xmit to detect routing loops. * Unlike XMIT_RECURSION_LIMIT (8) used in the no-qdisc path, tunnel * recursion involves route lookups and full IP output, consuming much * more stack per level, so a lower limit is needed. */#define IP_TUNNEL_RECURSION_LIMIT 5
/* Keep error state on tunnel for 30 sec */#define IPTUNNEL_ERR_TIMEO (30*HZ)
/* Used to memset ip_tunnel padding. */#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
/* Used to memset ipv4 address padding. */#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)#define IP_TUNNEL_KEY_IPV4_PAD_LEN \ (sizeof_field(struct ip_tunnel_key, u) - \ sizeof_field(struct ip_tunnel_key, u.ipv4))
#define __ipt_flag_op(op, ...) \ op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM)
#define IP_TUNNEL_DECLARE_FLAGS(...) \ __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__)
#define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__)#define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__)#define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__)#define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__)
#define ip_tunnel_flags_empty(...) \ __ipt_flag_op(bitmap_empty, __VA_ARGS__)#define ip_tunnel_flags_intersect(...) \ __ipt_flag_op(bitmap_intersects, __VA_ARGS__)#define ip_tunnel_flags_subset(...) \ __ipt_flag_op(bitmap_subset, __VA_ARGS__)
struct ip_tunnel_key { __be64 tun_id; union { struct { __be32 src; __be32 dst; } ipv4; struct { struct in6_addr src; struct in6_addr dst; } ipv6; } u; IP_TUNNEL_DECLARE_FLAGS(tun_flags); __be32 label; /* Flow Label for IPv6 */ u32 nhid; u8 tos; /* TOS for IPv4, TC for IPv6 */ u8 ttl; /* TTL for IPv4, HL for IPv6 */ __be16 tp_src; __be16 tp_dst; __u8 flow_flags;};
struct ip_tunnel_encap { u16 type; u16 flags; __be16 sport; __be16 dport;};
/* Flags for ip_tunnel_info mode. */#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */#define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
/* Maximum tunnel options length. */#define IP_TUNNEL_OPTS_MAX \ GENMASK((sizeof_field(struct ip_tunnel_info, \ options_len) * BITS_PER_BYTE) - 1, 0)
#define ip_tunnel_info_opts(info) \ _Generic(info, \ const struct ip_tunnel_info * : ((const void *)(info)->options),\ struct ip_tunnel_info * : ((void *)(info)->options)\ )
struct ip_tunnel_info { struct ip_tunnel_key key; struct ip_tunnel_encap encap;#ifdef CONFIG_DST_CACHE struct dst_cache dst_cache;#endif u8 options_len; u8 mode; u8 options[] __aligned_largest __counted_by(options_len);};
/* 6rd prefix/relay information */#ifdef CONFIG_IPV6_SIT_6RDstruct ip_tunnel_6rd_parm { struct in6_addr prefix; __be32 relay_prefix; u16 prefixlen; u16 relay_prefixlen;};#endif
struct ip_tunnel_prl_entry { struct ip_tunnel_prl_entry __rcu *next; __be32 addr; u16 flags; struct rcu_head rcu_head;};
struct metadata_dst;
/* Kernel-side variant of ip_tunnel_parm */struct ip_tunnel_parm_kern { char name[IFNAMSIZ]; IP_TUNNEL_DECLARE_FLAGS(i_flags); IP_TUNNEL_DECLARE_FLAGS(o_flags); __be32 i_key; __be32 o_key; int link; struct iphdr iph;};
struct ip_tunnel { struct ip_tunnel __rcu *next; struct hlist_node hash_node;
struct net_device *dev; netdevice_tracker dev_tracker;
struct net *net; /* netns for packet i/o */
unsigned long err_time; /* Time when the last ICMP error * arrived */ int err_count; /* Number of arrived ICMP errors */
/* These four fields used only by GRE */ u32 i_seqno; /* The last seen seqno */ atomic_t o_seqno; /* The last output seqno */ int tun_hlen; /* Precalculated header length */
/* These four fields used only by ERSPAN */ u32 index; /* ERSPAN type II index */ u8 erspan_ver; /* ERSPAN version */ u8 dir; /* ERSPAN direction */ u16 hwid; /* ERSPAN hardware ID */
struct dst_cache dst_cache;
struct ip_tunnel_parm_kern parms;
int mlink; int encap_hlen; /* Encap header length (FOU,GUE) */ int hlen; /* tun_hlen + encap_hlen */ struct ip_tunnel_encap encap;
/* 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 */ unsigned int ip_tnl_net_id; struct gro_cells gro_cells; __u32 fwmark; bool collect_md; bool ignore_df;};
struct tnl_ptk_info { IP_TUNNEL_DECLARE_FLAGS(flags); __be16 proto; __be32 key; __be32 seq; int hdr_len;};
#define PACKET_RCVD 0#define PACKET_REJECT 1#define PACKET_NEXT 2
#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 rtnl_link_ops *rtnl_link_ops; struct hlist_head tunnels[IP_TNL_HASH_SIZE]; struct ip_tunnel __rcu *collect_md_tun; int type;};
static inline void ip_tunnel_set_options_present(unsigned long *flags){ IP_TUNNEL_DECLARE_FLAGS(present) = { };
__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
ip_tunnel_flags_or(flags, flags, present);}
static inline void ip_tunnel_clear_options_present(unsigned long *flags){ IP_TUNNEL_DECLARE_FLAGS(present) = { };
__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
__ipt_flag_op(bitmap_andnot, flags, flags, present);}
static inline bool ip_tunnel_is_options_present(const unsigned long *flags){ IP_TUNNEL_DECLARE_FLAGS(present) = { };
__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
return ip_tunnel_flags_intersect(flags, present);}
static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags){ IP_TUNNEL_DECLARE_FLAGS(supp) = { };
bitmap_set(supp, 0, BITS_PER_TYPE(__be16)); __set_bit(IP_TUNNEL_VTI_BIT, supp);
return ip_tunnel_flags_subset(flags, supp);}
static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags){ ip_tunnel_flags_zero(dst);
bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16)); __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI);}
static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags){ __be16 ret;
ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16))); if (test_bit(IP_TUNNEL_VTI_BIT, flags)) ret |= VTI_ISVTI;
return ret;}
static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, __be32 saddr, __be32 daddr, u8 tos, u8 ttl, __be32 label, __be16 tp_src, __be16 tp_dst, __be64 tun_id, const unsigned long *tun_flags){ key->tun_id = tun_id; key->u.ipv4.src = saddr; key->u.ipv4.dst = daddr; memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); key->tos = tos; key->ttl = ttl; key->label = label; ip_tunnel_flags_copy(key->tun_flags, tun_flags);
/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of * the upper tunnel are used. * E.g: GRE over IPSEC, the tp_src and tp_port are zero. */ key->tp_src = tp_src; key->tp_dst = tp_dst;
/* Clear struct padding. */ if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);}
static inline boolip_tunnel_dst_cache_usable(const struct sk_buff *skb, const struct ip_tunnel_info *info){ if (skb->mark) return false;
return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags);}
static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info *tun_info){ return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;}
static inline __be64 key32_to_tunnel_id(__be32 key){#ifdef __BIG_ENDIAN return (__force __be64)key;#else return (__force __be64)((__force u64)key << 32);#endif}
/* Returns the least-significant 32 bits of a __be64. */static inline __be32 tunnel_id_to_key32(__be64 tun_id){#ifdef __BIG_ENDIAN return (__force __be32)tun_id;#else return (__force __be32)((__force u64)tun_id >> 32);#endif}
#ifdef CONFIG_INET
static inline void ip_tunnel_init_flow(struct flowi4 *fl4, int proto, __be32 daddr, __be32 saddr, __be32 key, __u8 tos, struct net *net, int oif, __u32 mark, __u32 tun_inner_hash, __u8 flow_flags){ memset(fl4, 0, sizeof(*fl4));
if (oif) { fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif); /* Legacy VRF/l3mdev use case */ fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif; }
fl4->daddr = daddr; fl4->saddr = saddr; fl4->flowi4_dscp = inet_dsfield_to_dscp(tos); fl4->flowi4_proto = proto; fl4->fl4_gre_key = key; fl4->flowi4_mark = mark; fl4->flowi4_multipath_hash = tun_inner_hash; fl4->flowi4_flags = flow_flags;}
int __ip_tunnel_init(struct net_device *dev);#define ip_tunnel_init(DEV) \({ \ struct net_device *__dev = (DEV); \ int __res = __ip_tunnel_init(__dev); \ \ if (!__res) \ netdev_lockdep_set_classes(__dev);\ __res; \})
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, unsigned int ip_tnl_net_id, struct rtnl_link_ops *ops, char *devname);void ip_tunnel_delete_net(struct net *net, unsigned int id, struct rtnl_link_ops *ops, struct list_head *dev_to_kill);
void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, const struct iphdr *tnl_params, const u8 protocol);void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, const u8 proto, int tunnel_hlen);int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd);bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp, const void __user *data);bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp);int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd);int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, int link, const unsigned long *flags, __be32 remote, __be32 local, __be32 key);
void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info);int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, bool log_ecn_error);int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], struct ip_tunnel_parm_kern *p, __u32 fwmark);int ip_tunnel_newlink(struct net *net, struct net_device *dev, struct nlattr *tb[], struct ip_tunnel_parm_kern *p, __u32 fwmark);void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], struct ip_tunnel_encap *encap);
void ip_tunnel_netlink_parms(struct nlattr *data[], struct ip_tunnel_parm_kern *parms);
extern const struct header_ops ip_tunnel_header_ops;__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
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); int (*err_handler)(struct sk_buff *skb, u32 info);};
#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);
int ip_tunnel_encap_setup(struct ip_tunnel *t, struct ip_tunnel_encap *ipencap);
static inline enum skb_drop_reasonpskb_inet_may_pull_reason(struct sk_buff *skb){ int nhlen;
switch (skb->protocol) {#if IS_ENABLED(CONFIG_IPV6) case htons(ETH_P_IPV6): nhlen = sizeof(struct ipv6hdr); break;#endif case htons(ETH_P_IP): nhlen = sizeof(struct iphdr); break; default: nhlen = 0; }
return pskb_network_may_pull_reason(skb, nhlen);}
static inline bool pskb_inet_may_pull(struct sk_buff *skb){ return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET;}
/* Variant of pskb_inet_may_pull(). */static inline enum skb_drop_reasonskb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit){ int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN; __be16 type = skb->protocol; enum skb_drop_reason reason;
/* Essentially this is skb_protocol(skb, true) * And we get MAC len. */ if (eth_type_vlan(type)) type = __vlan_get_protocol(skb, type, &maclen);
switch (type) {#if IS_ENABLED(CONFIG_IPV6) case htons(ETH_P_IPV6): nhlen = sizeof(struct ipv6hdr); break;#endif case htons(ETH_P_IP): nhlen = sizeof(struct iphdr); break; } /* For ETH_P_IPV6/ETH_P_IP we make sure to pull * a base network header in skb->head. */ reason = pskb_may_pull_reason(skb, maclen + nhlen); if (reason) return reason;
skb_set_network_header(skb, maclen);
return SKB_NOT_DROPPED_YET;}
static inline int ip_encap_hlen(struct ip_tunnel_encap *e){ const struct ip_tunnel_encap_ops *ops; int hlen = -EINVAL;
if (e->type == TUNNEL_ENCAP_NONE) return 0;
if (e->type >= MAX_IPTUN_ENCAP_OPS) return -EINVAL;
rcu_read_lock(); ops = rcu_dereference(iptun_encaps[e->type]); if (likely(ops && ops->encap_hlen)) hlen = ops->encap_hlen(e); rcu_read_unlock();
return hlen;}
static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel_encap *e, u8 *protocol, struct flowi4 *fl4){ const struct ip_tunnel_encap_ops *ops; int ret = -EINVAL;
if (e->type == TUNNEL_ENCAP_NONE) return 0;
if (e->type >= MAX_IPTUN_ENCAP_OPS) return -EINVAL;
rcu_read_lock(); ops = rcu_dereference(iptun_encaps[e->type]); if (likely(ops && ops->build_header)) ret = ops->build_header(skb, e, protocol, fl4); rcu_read_unlock();
return ret;}
/* Extract dsfield from inner protocol */static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, const struct sk_buff *skb){ __be16 payload_protocol = skb_protocol(skb, true);
if (payload_protocol == htons(ETH_P_IP)) return iph->tos; else if (payload_protocol == htons(ETH_P_IPV6)) return ipv6_get_dsfield((const struct ipv6hdr *)iph); else return 0;}
static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph, const struct sk_buff *skb){ __be16 payload_protocol = skb_protocol(skb, true);
if (payload_protocol == htons(ETH_P_IPV6)) return ip6_flowlabel((const struct ipv6hdr *)iph); else return 0;}
static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, const struct sk_buff *skb){ __be16 payload_protocol = skb_protocol(skb, true);
if (payload_protocol == htons(ETH_P_IP)) return iph->ttl; else if (payload_protocol == htons(ETH_P_IPV6)) return ((const struct ipv6hdr *)iph)->hop_limit; else return 0;}
/* Propagate 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, bool raw_proto, bool xnet);
static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, bool xnet){ return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);}
void 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, u16 ipcb_flags);struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, gfp_t flags);int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, int headroom, bool reply);
static inline void ip_tunnel_adj_headroom(struct net_device *dev, unsigned int headroom){ /* we must cap headroom to some upperlimit, else pskb_expand_head * will overflow header offsets in skb_headers_offset_update(). */ const unsigned int max_allowed = 512;
if (headroom > max_allowed) headroom = max_allowed;
if (headroom > READ_ONCE(dev->needed_headroom)) WRITE_ONCE(dev->needed_headroom, headroom);}
int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
static inline int iptunnel_pull_offloads(struct sk_buff *skb){ if (skb_is_gso(skb)) { int err;
err = skb_unclone(skb, GFP_ATOMIC); if (unlikely(err)) return err; skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> NETIF_F_GSO_SHIFT); }
skb->encapsulation = 0; return 0;}
static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len){ if (pkt_len > 0) { if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_DSTATS) { struct pcpu_dstats *dstats = get_cpu_ptr(dev->dstats);
u64_stats_update_begin(&dstats->syncp); u64_stats_add(&dstats->tx_bytes, pkt_len); u64_stats_inc(&dstats->tx_packets); u64_stats_update_end(&dstats->syncp); put_cpu_ptr(dstats); return; } if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_TSTATS) { struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp); u64_stats_add(&tstats->tx_bytes, pkt_len); u64_stats_inc(&tstats->tx_packets); u64_stats_update_end(&tstats->syncp); put_cpu_ptr(tstats); return; } pr_err_once("iptunnel_xmit_stats pcpu_stat_type=%d\n", dev->pcpu_stat_type); WARN_ON_ONCE(1); return; }
if (pkt_len < 0) { DEV_STATS_INC(dev, tx_errors); DEV_STATS_INC(dev, tx_aborted_errors); } else { DEV_STATS_INC(dev, tx_dropped); }}
static inline void ip_tunnel_info_opts_get(void *to, const struct ip_tunnel_info *info){ memcpy(to, ip_tunnel_info_opts(info), info->options_len);}
static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, const void *from, int len, const unsigned long *flags){ info->options_len = len; if (len > 0) { memcpy(ip_tunnel_info_opts(info), from, len); ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags, flags); }}
static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate){ return (struct ip_tunnel_info *)lwtstate->data;}
DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
/* Returns > 0 if metadata should be collected */static inline int ip_tunnel_collect_metadata(void){ return static_branch_unlikely(&ip_tunnel_metadata_cnt);}
void __init ip_tunnel_core_init(void);
void ip_tunnel_need_metadata(void);void ip_tunnel_unneed_metadata(void);
#else /* CONFIG_INET */
static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate){ return NULL;}
static inline void ip_tunnel_need_metadata(void){}
static inline void ip_tunnel_unneed_metadata(void){}
static inline void ip_tunnel_info_opts_get(void *to, const struct ip_tunnel_info *info){}
static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, const void *from, int len, const unsigned long *flags){ info->options_len = 0;}
#endif /* CONFIG_INET */
#endif /* __NET_IP_TUNNELS_H */