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tpws: ip6_and use 64-bit and. 128 can cause alignment segfaults

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bol-van 2024-10-16 11:21:31 +03:00
parent 33caf4fd4a
commit 6be111f7b7
2 changed files with 1 additions and 6 deletions
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6
tpws/helpers.c
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@ -321,13 +321,9 @@ __attribute__((optimize ("no-strict-aliasing")))
#endif
void ip6_and(const struct in6_addr * restrict a, const struct in6_addr * restrict b, struct in6_addr * restrict result)
{
#ifdef __SIZEOF_INT128__
// gcc and clang have 128 bit int types on some 64-bit archs. take some advantage
*((unsigned __int128*)result->s6_addr) = *((unsigned __int128*)a->s6_addr) & *((unsigned __int128*)b->s6_addr);
#else
// int 128 can cause alignment segfaults because sin6_addr in struct sockaddr_in6 is 8-byte aligned, not 16-byte
((uint64_t*)result->s6_addr)[0] = ((uint64_t*)a->s6_addr)[0] & ((uint64_t*)b->s6_addr)[0];
((uint64_t*)result->s6_addr)[1] = ((uint64_t*)a->s6_addr)[1] & ((uint64_t*)b->s6_addr)[1];
#endif
}
void str_cidr4(char *s, size_t s_len, const struct cidr4 *cidr)

1
tpws/helpers.h
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@ -13,7 +13,6 @@ typedef union
{
struct sockaddr_in sa4; // size 16
struct sockaddr_in6 sa6; // size 28
char _align[32]; // force 16-byte alignment for ip6_and int128 ops
} sockaddr_in46;
void rtrim(char *s);