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// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#ifndef _TEST_TCP_SYNCOOKIE_H
#define _TEST_TCP_SYNCOOKIE_H
#define __packed __attribute__((__packed__))
#define __force
#define swap(a, b) \
do { \
typeof(a) __tmp = (a); \
(a) = (b); \
(b) = __tmp; \
} while (0)
#define swap_array(a, b) \
do { \
typeof(a) __tmp[sizeof(a)]; \
__builtin_memcpy(__tmp, a, sizeof(a)); \
__builtin_memcpy(a, b, sizeof(a)); \
__builtin_memcpy(b, __tmp, sizeof(a)); \
} while (0)
/* linux/unaligned.h */
#define __get_unaligned_t(type, ptr) ({ \
const struct { type x; } __packed * __pptr = (typeof(__pptr))(ptr); \
__pptr->x; \
})
#define get_unaligned(ptr) __get_unaligned_t(typeof(*(ptr)), (ptr))
static inline u16 get_unaligned_be16(const void *p)
{
return bpf_ntohs(__get_unaligned_t(__be16, p));
}
static inline u32 get_unaligned_be32(const void *p)
{
return bpf_ntohl(__get_unaligned_t(__be32, p));
}
/* lib/checksum.c */
static inline u32 from64to32(u64 x)
{
/* add up 32-bit and 32-bit for 32+c bit */
x = (x & 0xffffffff) + (x >> 32);
/* add up carry.. */
x = (x & 0xffffffff) + (x >> 32);
return (u32)x;
}
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto, __wsum sum)
{
unsigned long long s = (__force u32)sum;
s += (__force u32)saddr;
s += (__force u32)daddr;
#ifdef __BIG_ENDIAN
s += proto + len;
#else
s += (proto + len) << 8;
#endif
return (__force __wsum)from64to32(s);
}
/* asm-generic/checksum.h */
static inline __sum16 csum_fold(__wsum csum)
{
u32 sum = (__force u32)csum;
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return (__force __sum16)~sum;
}
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
__u8 proto, __wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
}
/* net/ipv6/ip6_checksum.c */
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, __u8 proto, __wsum csum)
{
int carry;
__u32 ulen;
__u32 uproto;
__u32 sum = (__force u32)csum;
sum += (__force u32)saddr->in6_u.u6_addr32[0];
carry = (sum < (__force u32)saddr->in6_u.u6_addr32[0]);
sum += carry;
sum += (__force u32)saddr->in6_u.u6_addr32[1];
carry = (sum < (__force u32)saddr->in6_u.u6_addr32[1]);
sum += carry;
sum += (__force u32)saddr->in6_u.u6_addr32[2];
carry = (sum < (__force u32)saddr->in6_u.u6_addr32[2]);
sum += carry;
sum += (__force u32)saddr->in6_u.u6_addr32[3];
carry = (sum < (__force u32)saddr->in6_u.u6_addr32[3]);
sum += carry;
sum += (__force u32)daddr->in6_u.u6_addr32[0];
carry = (sum < (__force u32)daddr->in6_u.u6_addr32[0]);
sum += carry;
sum += (__force u32)daddr->in6_u.u6_addr32[1];
carry = (sum < (__force u32)daddr->in6_u.u6_addr32[1]);
sum += carry;
sum += (__force u32)daddr->in6_u.u6_addr32[2];
carry = (sum < (__force u32)daddr->in6_u.u6_addr32[2]);
sum += carry;
sum += (__force u32)daddr->in6_u.u6_addr32[3];
carry = (sum < (__force u32)daddr->in6_u.u6_addr32[3]);
sum += carry;
ulen = (__force u32)bpf_htonl((__u32)len);
sum += ulen;
carry = (sum < ulen);
sum += carry;
uproto = (__force u32)bpf_htonl(proto);
sum += uproto;
carry = (sum < uproto);
sum += carry;
return csum_fold((__force __wsum)sum);
}
#endif
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