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network: check prefixlen when null address is specified to Address=

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This commit is contained in:
Yu Watanabe 2019-02-20 18:36:17 +09:00
parent f2efbeafb8
commit c9207ff3a4
1 changed files with 13 additions and 0 deletions
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13
src/network/networkd-address.c
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@ -761,6 +761,19 @@ int config_parse_address(const char *unit,
return 0;
}
if (in_addr_is_null(f, &buffer)) {
/* Will use address from address pool. Note that for ipv6 case, prefix of the address
* pool is 8, but 40 bit is used by the global ID and 16 bit by the subnet ID. So,
* let's limit the prefix length to 64 or larger. See RFC4193. */
if ((f == AF_INET && prefixlen < 8) ||
(f == AF_INET6 && prefixlen < 64)) {
log_syntax(unit, LOG_ERR, filename, line, 0,
"Null address with invalid prefixlen='%u', ignoring assignment: %s",
prefixlen, rvalue);
return 0;
}
}
n->family = f;
n->prefixlen = prefixlen;