/* SPDX-License-Identifier: GPL-2.0 */
#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/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       4

/* 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_6RD
struct 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 bool
ip_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_reason
pskb_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_reason
skb_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 */