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compat.h
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compat.h
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/* SPDX-License-Identifier: GPL-2.0-only
*
* This code is derived from the Linux Kernel sources intended
* to maintain compatibility with different Kernel versions.
* Copyright of original source is of respective Linux Kernel authors.
*/
#ifndef COMPAT_NETFLOW_H
#define COMPAT_NETFLOW_H
#include "compat_def.h"
#ifndef NIPQUAD
# define NIPQUAD(addr) \
((unsigned char *)&addr)[0], \
((unsigned char *)&addr)[1], \
((unsigned char *)&addr)[2], \
((unsigned char *)&addr)[3]
#endif
#ifndef HIPQUAD
# if defined(__LITTLE_ENDIAN)
# define HIPQUAD(addr) \
((unsigned char *)&addr)[3], \
((unsigned char *)&addr)[2], \
((unsigned char *)&addr)[1], \
((unsigned char *)&addr)[0]
# elif defined(__BIG_ENDIAN)
# define HIPQUAD NIPQUAD
# else
# error "Please fix asm/byteorder.h"
# endif /* __LITTLE_ENDIAN */
#endif
#ifndef IPT_CONTINUE
# define IPT_CONTINUE XT_CONTINUE
# define ipt_target xt_target
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
union nf_inet_addr {
__be32 ip;
__be32 ip6[4];
struct in_addr in;
struct in6_addr in6;
};
#endif
#ifndef list_first_entry
#define list_first_entry(ptr, type, member) \
list_entry((ptr)->next, type, member)
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
# define INIT_NET(x) x
#else
# define INIT_NET(x) init_net.x
#endif
#ifndef ETH_P_8021AD
# define ETH_P_8021AD 0x88A8 /* 802.1ad Service VLAN */
#endif
#ifndef ETH_P_QINQ1
# define ETH_P_QINQ1 0x9100 /* deprecated QinQ VLAN */
# define ETH_P_QINQ2 0x9200 /* deprecated QinQ VLAN */
# define ETH_P_QINQ3 0x9300 /* deprecated QinQ VLAN */
#endif
#ifndef IPPROTO_MH
# define IPPROTO_MH 135
#endif
#ifdef CONFIG_SYSCTL
# if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
# define BEFORE2632(x,y) x,y
# else /* since 2.6.32 */
# define BEFORE2632(x,y)
# endif
# if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
# define ctl_table struct ctl_table
# endif
# ifndef HAVE_GRSECURITY_H
# define ctl_table_no_const ctl_table
# endif
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
# define compat_hlist_for_each_entry hlist_for_each_entry
# define compat_hlist_for_each_entry_safe hlist_for_each_entry_safe
#else /* since 3.9.0 */
# define compat_hlist_for_each_entry(a,pos,c,d) hlist_for_each_entry(a,c,d)
# define compat_hlist_for_each_entry_safe(a,pos,c,d,e) hlist_for_each_entry_safe(a,c,d,e)
#endif
#ifndef WARN_ONCE
#define WARN_ONCE(x,fmt...) ({ if (x) printk(KERN_WARNING fmt); })
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
# define IPPROTO_UDPLITE 136
#endif
#ifndef time_is_before_jiffies
# define time_is_before_jiffies(a) time_after(jiffies, a)
#endif
#ifndef time_is_after_jiffies
# define time_is_after_jiffies(a) time_before(jiffies, a)
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
# if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
# define prandom_u32 get_random_int
# elif LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0)
# define prandom_u32 random32
#endif
#define prandom_u32_max compat_prandom_u32_max
static inline u32 prandom_u32_max(u32 ep_ro)
{
return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
}
#endif
#ifndef min_not_zero
# define min_not_zero(x, y) ({ \
typeof(x) __x = (x); \
typeof(y) __y = (y); \
__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
static int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
ASSERT_RTNL();
if (!dev->ethtool_ops->get_settings)
return -EOPNOTSUPP;
memset(cmd, 0, sizeof(struct ethtool_cmd));
cmd->cmd = ETHTOOL_GSET;
return dev->ethtool_ops->get_settings(dev, cmd);
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
# define ethtool_cmd_speed(x) (x)->speed
#endif
#ifndef ARPHRD_PHONET
# define ARPHRD_PHONET 820
# define ARPHRD_PHONET_PIPE 821
#endif
#ifndef ARPHRD_IEEE802154
# define ARPHRD_IEEE802154 804
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
# define for_each_netdev_ns(net, dev) for (dev = dev_base; dev; dev = dev->next)
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
# define for_each_netdev_ns(net, d) for_each_netdev(d)
#else
# define for_each_netdev_ns(net, d) for_each_netdev(net, d)
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
# define CHECK_FAIL 0
# define CHECK_OK 1
#else
# define CHECK_FAIL -EINVAL
# define CHECK_OK 0
#endif
#ifndef NF_IP_LOCAL_IN /* 2.6.25 */
# define NF_IP_PRE_ROUTING NF_INET_PRE_ROUTING
# define NF_IP_LOCAL_IN NF_INET_LOCAL_IN
# define NF_IP_FORWARD NF_INET_FORWARD
# define NF_IP_LOCAL_OUT NF_INET_LOCAL_OUT
# define NF_IP_POST_ROUTING NF_INET_POST_ROUTING
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
/* net/netfilter/x_tables.c */
static void xt_unregister_targets(struct xt_target *target, unsigned int n)
{
unsigned int i;
for (i = 0; i < n; i++)
xt_unregister_target(&target[i]);
}
static int xt_register_targets(struct xt_target *target, unsigned int n)
{
unsigned int i;
int err = 0;
for (i = 0; i < n; i++)
if ((err = xt_register_target(&target[i])))
goto err;
return err;
err:
if (i > 0)
xt_unregister_targets(target, i);
return err;
}
#endif
#ifdef HAVE_TOTALRAM_PAGES
#define num_physpages totalram_pages()
#elif defined HAVE_TOTALRAM_PAGES_REF
#define num_physpages totalram_pages
#endif
#ifndef HAVE_TIMEVAL
/* timeval is only used internally, so we can use anything for it. */
struct timeval {
long tv_sec;
long tv_usec; /* microseconds */
};
unsigned long timeval_to_jiffies(const struct timeval *tv)
{
return timespec64_to_jiffies(&(struct timespec64){
tv->tv_sec,
tv->tv_usec * NSEC_PER_USEC
});
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
# ifdef ktime_to_timeval
/* ktime_to_timeval is defined on 64bit and inline on 32bit cpu */
/* when it's defined it calls ns_to_timeval, which is not exported */
struct timeval portable_ns_to_timeval(const s64 nsec)
{
struct timespec ts = ns_to_timespec(nsec);
struct timeval tv;
tv.tv_sec = ts.tv_sec;
tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
return tv;
}
# define ns_to_timeval portable_ns_to_timeval
# endif
static inline s64 portable_ktime_to_ms(const ktime_t kt)
{
struct timeval tv = ktime_to_timeval(kt);
return (s64) tv.tv_sec * MSEC_PER_SEC + tv.tv_usec / USEC_PER_MSEC;
}
# define ktime_to_ms portable_ktime_to_ms
#endif /* before 2.6.35 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
static inline s64 portable_ktime_to_us(const ktime_t kt)
{
struct timeval tv = ktime_to_timeval(kt);
return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
}
#define ktime_to_us portable_ktime_to_us
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
static inline void put_unaligned_be16(u16 val, void *p)
{
put_unaligned(cpu_to_be16(val), (__be16 *)p);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
put_unaligned(cpu_to_be32(val), (__be32 *)p);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
put_unaligned(cpu_to_be64(val), (__be64 *)p);
}
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,24) && !defined(RHEL_MAJOR)
static void *__seq_open_private(struct file *f, struct seq_operations *ops,
int psize)
{
int rc;
void *private;
struct seq_file *seq;
private = kzalloc(psize, GFP_KERNEL);
if (private == NULL)
goto out;
rc = seq_open(f, ops);
if (rc < 0)
goto out_free;
seq = f->private_data;
seq->private = private;
return private;
out_free:
kfree(private);
out:
return NULL;
}
#endif
/* disappeared in v3.19 */
#ifndef __get_cpu_var
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
#endif
#ifndef MPLS_HLEN
#define MPLS_HLEN 4
static inline int eth_p_mpls(__be16 eth_type)
{
return eth_type == htons(ETH_P_MPLS_UC) ||
eth_type == htons(ETH_P_MPLS_MC);
}
#endif
#ifndef MPLS_LS_S_MASK
struct mpls_label {
__be32 entry;
};
#define MPLS_LS_S_MASK 0x00000100
#endif
/* sockaddr comparison functions is from fs/nfs/client.c */
static int sockaddr_match_ipaddr6(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
return 0;
#if 0
else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
return sin1->sin6_scope_id == sin2->sin6_scope_id;
#endif
return 1;
}
static int sockaddr_match_ipaddr4(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}
static int sockaddr_cmp_ip6(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
return sockaddr_match_ipaddr6(sa1, sa2) &&
(sin1->sin6_port == sin2->sin6_port);
}
static int sockaddr_cmp_ip4(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
return sockaddr_match_ipaddr4(sa1, sa2) &&
(sin1->sin_port == sin2->sin_port);
}
static int sockaddr_cmp(const struct sockaddr_storage *sa1, const struct sockaddr_storage *sa2)
{
const struct sockaddr *s1 = (const struct sockaddr *)sa1;
const struct sockaddr *s2 = (const struct sockaddr *)sa2;
if (sa1->ss_family != sa2->ss_family)
return 0;
switch (sa1->ss_family) {
case AF_INET:
return sockaddr_cmp_ip4(s1, s2);
case AF_INET6:
return sockaddr_cmp_ip6(s1, s2);
}
return 0;
}
#ifndef IN6PTON_XDIGIT
#define hex_to_bin compat_hex_to_bin
/* lib/hexdump.c */
int hex_to_bin(char ch)
{
if ((ch >= '0') && (ch <= '9'))
return ch - '0';
ch = tolower(ch);
if ((ch >= 'a') && (ch <= 'f'))
return ch - 'a' + 10;
return -1;
}
/* net/core/utils.c */
#define IN6PTON_XDIGIT 0x00010000
#define IN6PTON_DIGIT 0x00020000
#define IN6PTON_COLON_MASK 0x00700000
#define IN6PTON_COLON_1 0x00100000 /* single : requested */
#define IN6PTON_COLON_2 0x00200000 /* second : requested */
#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
#define IN6PTON_DOT 0x00800000 /* . */
#define IN6PTON_DELIM 0x10000000
#define IN6PTON_NULL 0x20000000 /* first/tail */
#define IN6PTON_UNKNOWN 0x40000000
static inline int xdigit2bin(char c, int delim)
{
int val;
if (c == delim || c == '\0')
return IN6PTON_DELIM;
if (c == ':')
return IN6PTON_COLON_MASK;
if (c == '.')
return IN6PTON_DOT;
val = hex_to_bin(c);
if (val >= 0)
return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);
if (delim == -1)
return IN6PTON_DELIM;
return IN6PTON_UNKNOWN;
}
int in4_pton(const char *src, int srclen,
u8 *dst,
int delim, const char **end)
{
const char *s;
u8 *d;
u8 dbuf[4];
int ret = 0;
int i;
int w = 0;
if (srclen < 0)
srclen = strlen(src);
s = src;
d = dbuf;
i = 0;
while(1) {
int c;
c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
goto out;
}
if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
if (w == 0)
goto out;
*d++ = w & 0xff;
w = 0;
i++;
if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
if (i != 4)
goto out;
break;
}
goto cont;
}
w = (w * 10) + c;
if ((w & 0xffff) > 255) {
goto out;
}
cont:
if (i >= 4)
goto out;
s++;
srclen--;
}
ret = 1;
memcpy(dst, dbuf, sizeof(dbuf));
out:
if (end)
*end = s;
return ret;
}
int in6_pton(const char *src, int srclen,
u8 *dst,
int delim, const char **end)
{
const char *s, *tok = NULL;
u8 *d, *dc = NULL;
u8 dbuf[16];
int ret = 0;
int i;
int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
int w = 0;
memset(dbuf, 0, sizeof(dbuf));
s = src;
d = dbuf;
if (srclen < 0)
srclen = strlen(src);
while (1) {
int c;
c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
if (!(c & state))
goto out;
if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
/* process one 16-bit word */
if (!(state & IN6PTON_NULL)) {
*d++ = (w >> 8) & 0xff;
*d++ = w & 0xff;
}
w = 0;
if (c & IN6PTON_DELIM) {
/* We've processed last word */
break;
}
/*
* COLON_1 => XDIGIT
* COLON_2 => XDIGIT|DELIM
* COLON_1_2 => COLON_2
*/
switch (state & IN6PTON_COLON_MASK) {
case IN6PTON_COLON_2:
dc = d;
state = IN6PTON_XDIGIT | IN6PTON_DELIM;
if (dc - dbuf >= sizeof(dbuf))
state |= IN6PTON_NULL;
break;
case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
break;
case IN6PTON_COLON_1:
state = IN6PTON_XDIGIT;
break;
case IN6PTON_COLON_1_2:
state = IN6PTON_COLON_2;
break;
default:
state = 0;
}
tok = s + 1;
goto cont;
}
if (c & IN6PTON_DOT) {
ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
if (ret > 0) {
d += 4;
break;
}
goto out;
}
w = (w << 4) | (0xff & c);
state = IN6PTON_COLON_1 | IN6PTON_DELIM;
if (!(w & 0xf000)) {
state |= IN6PTON_XDIGIT;
}
if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
state |= IN6PTON_COLON_1_2;
state &= ~IN6PTON_DELIM;
}
if (d + 2 >= dbuf + sizeof(dbuf)) {
state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
}
cont:
if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
d + 4 == dbuf + sizeof(dbuf)) {
state |= IN6PTON_DOT;
}
if (d >= dbuf + sizeof(dbuf)) {
state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
}
s++;
srclen--;
}
i = 15; d--;
if (dc) {
while(d >= dc)
dst[i--] = *d--;
while(i >= dc - dbuf)
dst[i--] = 0;
while(i >= 0)
dst[i--] = *d--;
} else
memcpy(dst, dbuf, sizeof(dbuf));
ret = 1;
out:
if (end)
*end = s;
return ret;
}
#endif /* IN6PTON_XDIGIT */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
# define sock_create_kern(f, t, p, s) sock_create_kern(&init_net, f, t, p, s)
#endif
#if !defined(vlan_tx_tag_get) && defined(skb_vlan_tag_get)
# define vlan_tx_tag_get skb_vlan_tag_get
# define vlan_tx_tag_present skb_vlan_tag_present
#endif
#ifndef SPEED_UNKNOWN
# define SPEED_UNKNOWN -1
#endif
#if !defined __GNUC_PREREQ && defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define __GNUC_PREREQ(maj, min) 0
#endif
/* ktime is not union anymore, since 2456e855354415bfaeb7badaa14e11b3e02c8466 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0)
# define first_tv64 first.tv64
# define last_tv64 last.tv64
#else
# define first_tv64 first
# define last_tv64 last
#endif
/* Offset changes made in 613dbd95723aee7abd16860745691b6c7bda20dc */
#ifndef HAVE_XT_FAMILY
# if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
# define xt_action_param xt_target_param
# endif
static inline u_int8_t xt_family(const struct xt_action_param *par)
{
return par->family;
}
static inline const struct net_device *xt_in(const struct xt_action_param *par)
{
return par->in;
}
static inline const struct net_device *xt_out(const struct xt_action_param *par)
{
return par->out;
}
static inline unsigned int xt_hooknum(const struct xt_action_param *par)
{
return par->hooknum;
}
#endif
#ifndef SK_CAN_REUSE
# define SK_CAN_REUSE 1
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,13,0)
# define compat_refcount_read atomic_read
#else
# define compat_refcount_read refcount_read
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0)
# define timer_setup setup_timer
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,15,0)
static int dev_get_alias(const struct net_device *dev, char *name, size_t len)
{
return snprintf(name, len, "%s", dev->ifalias);
}
#else
/* no static because defined in include/linux/netdevice.h,
* but forgot to create EXPORT_SYMBOL,
* probably will collide with some future kernel */
int dev_get_alias(const struct net_device *dev, char *name, size_t len)
{
const struct dev_ifalias *alias;
int ret = 0;
rcu_read_lock();
alias = rcu_dereference(dev->ifalias);
if (alias)
ret = snprintf(name, len, "%s", alias->ifalias);
rcu_read_unlock();
return ret;
}
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,39) && !defined(RHEL_MAJOR)
static inline int is_vlan_dev(struct net_device *dev)
{
return dev->priv_flags & IFF_802_1Q_VLAN;
}
#endif
#ifdef CONFIG_BRIDGE_NETFILTER
# ifndef HAVE_NF_BRIDGE_INFO_GET
static inline struct nf_bridge_info *
nf_bridge_info_get(const struct sk_buff *skb)
{
return skb->nf_bridge;
}
# endif
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,0,0)
static inline void do_gettimeofday(struct timeval *tv)
{
struct timespec64 ts64;
ktime_get_real_ts64(&ts64);
tv->tv_sec = ts64.tv_sec;
tv->tv_usec = ts64.tv_nsec/1000;
}
#endif
#define TOLOWER(x) ((x) | 0x20)
unsigned long long strtoul(const char *cp, char **endp, unsigned int base)
{
unsigned long long result = 0;
if (!base) {
if (cp[0] == '0') {
if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
base = 16;
else
base = 8;
} else {
base = 10;
}
}
if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
cp += 2;
while (isxdigit(*cp)) {
unsigned int value;
value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
if (value >= base)
break;
result = result * base + value;
cp++;
}
if (endp)
*endp = (char *)cp;
return result;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,12,0)
/*
* find_module() is unexported in v5.12:
* 089049f6c9956 ("module: unexport find_module and module_mutex")
* and module_mutex is replaced with RCU in
* a006050575745 ("module: use RCU to synchronize find_module")
*/
#include <linux/rcupdate.h>
struct module *find_module(const char *name)
{
struct module *mod;
rcu_read_lock_sched();
/* Yes this is crazy, but should work. */
list_for_each_entry_rcu(mod, &THIS_MODULE->list, list) {
if (!strcmp(mod->name, name)) {
rcu_read_unlock_sched();
return mod;
}
}
rcu_read_unlock_sched();
return NULL;
}
#endif
/* Copy from 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
* keyword for switch/case use") */
#ifndef fallthrough
# if defined __has_attribute && __has_attribute(__fallthrough__)
# define fallthrough __attribute__((__fallthrough__))
# else
# define fallthrough do {} while (0) /* fallthrough */
# endif
#endif
#ifndef HAVE_NF_CT_EVENT_NOTIFIER_CT_EVENT
/*
* nat event callback parameter is constified in 5.15+
* but it prevents module building with previous kernel versions
*/
# define NF_CT_EVENT struct nf_ct_event
# define ct_event fcn
#else
# define NF_CT_EVENT const struct nf_ct_event
#endif
#endif /* COMPAT_NETFLOW_H */