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Merge pull request #402 from fobser/dns64

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Implement IPv4-Embedded addresses according to RFC6052.
This commit is contained in:
Wouter Wijngaards 2021-01-15 08:14:58 +01:00 committed by GitHub
commit 9a055c2df4
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1 changed files with 22 additions and 18 deletions
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40
dns64/dns64.c
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@ -198,14 +198,17 @@ uitoa(unsigned n, char* s)
static uint32_t
extract_ipv4(const uint8_t ipv6[], size_t ipv6_len, const int offset)
{
uint32_t ipv4;
uint32_t ipv4 = 0;
int i, pos;
log_assert(ipv6_len == 16); (void)ipv6_len;
ipv4 = (uint32_t)ipv6[offset/8+0] << (24 + (offset%8))
| (uint32_t)ipv6[offset/8+1] << (16 + (offset%8))
| (uint32_t)ipv6[offset/8+2] << ( 8 + (offset%8))
| (uint32_t)ipv6[offset/8+3] << ( 0 + (offset%8));
if (offset/8+4 < 16)
ipv4 |= (uint32_t)ipv6[offset/8+4] >> (8 - offset%8);
log_assert(offset == 32 || offset == 40 || offset == 48 || offset == 56 ||
offset == 64 || offset == 96);
for(i = 0, pos = offset / 8; i < 4; i++, pos++) {
if (pos == 8)
pos++;
ipv4 = ipv4 << 8;
ipv4 |= ipv6[pos];
}
return ipv4;
}
@ -297,17 +300,16 @@ synthesize_aaaa(const uint8_t prefix_addr[], size_t prefix_addr_len,
size_t aaaa_len)
{
log_assert(prefix_addr_len == 16 && a_len == 4 && aaaa_len == 16);
log_assert(prefix_net == 32 || prefix_net == 40 || prefix_net == 48 ||
prefix_net == 56 || prefix_net == 64 || prefix_net == 96);
int i, pos;
(void)prefix_addr_len; (void)a_len; (void)aaaa_len;
memcpy(aaaa, prefix_addr, 16);
aaaa[prefix_net/8+0] |= a[0] >> (0+prefix_net%8);
aaaa[prefix_net/8+1] |= a[0] << (8-prefix_net%8);
aaaa[prefix_net/8+1] |= a[1] >> (0+prefix_net%8);
aaaa[prefix_net/8+2] |= a[1] << (8-prefix_net%8);
aaaa[prefix_net/8+2] |= a[2] >> (0+prefix_net%8);
aaaa[prefix_net/8+3] |= a[2] << (8-prefix_net%8);
aaaa[prefix_net/8+3] |= a[3] >> (0+prefix_net%8);
if (prefix_net/8+4 < 16) /* <-- my beautiful symmetry is destroyed! */
aaaa[prefix_net/8+4] |= a[3] << (8-prefix_net%8);
for(i = 0, pos = prefix_net / 8; i < a_len; i++, pos++) {
if(pos == 8)
aaaa[pos++] = 0;
aaaa[pos] = a[i];
}
}
@ -374,8 +376,10 @@ dns64_apply_cfg(struct dns64_env* dns64_env, struct config_file* cfg)
log_err("dns64_prefix is not IPv6: %s", cfg->dns64_prefix);
return 0;
}
if (dns64_env->prefix_net < 0 || dns64_env->prefix_net > 96) {
log_err("dns64-prefix length it not between 0 and 96: %s",
if (dns64_env->prefix_net != 32 && dns64_env->prefix_net != 40 &&
dns64_env->prefix_net != 48 && dns64_env->prefix_net != 56 &&
dns64_env->prefix_net != 64 && dns64_env->prefix_net != 96 ) {
log_err("dns64-prefix length it not 32, 40, 48, 56, 64 or 96: %s",
cfg->dns64_prefix);
return 0;
}