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network: address label: refuse IPv4 mapped address with large prefix length

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See ip6addrlbl_alloc() in net/ipv6/addrlabel.c of kernel.
This commit is contained in:
Yu Watanabe 2021-05-18 13:02:16 +09:00
parent c3e960883f
commit 2551b422e1
1 changed files with 15 additions and 2 deletions
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17
src/network/networkd-address-label.c
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@ -169,6 +169,8 @@ int config_parse_address_label_prefix(const char *unit,
_cleanup_(address_label_free_or_set_invalidp) AddressLabel *n = NULL;
Network *network = userdata;
unsigned char prefixlen;
union in_addr_union a;
int r;
assert(filename);
@ -181,11 +183,22 @@ int config_parse_address_label_prefix(const char *unit,
if (r < 0)
return log_oom();
r = in_addr_prefix_from_string(rvalue, AF_INET6, &n->in_addr, &n->prefixlen);
r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &prefixlen);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Address label is invalid, ignoring assignment: %s", rvalue);
log_syntax(unit, LOG_WARNING, filename, line, r,
"Invalid prefix for address label, ignoring assignment: %s", rvalue);
return 0;
}
if (in6_addr_is_ipv4_mapped_address(&a.in6) && prefixlen > 96) {
/* See ip6addrlbl_alloc() in net/ipv6/addrlabel.c of kernel. */
log_syntax(unit, LOG_WARNING, filename, line, 0,
"The prefix length of IPv4 mapped address for address label must be equal to or smaller than 96, "
"ignoring assignment: %s", rvalue);
return 0;
}
n->in_addr = a;
n->prefixlen = prefixlen;
TAKE_PTR(n);
return 0;