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network: ndisc: ignore prefix option with link-local prefix

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See https://www.rfc-editor.org/rfc/rfc4861#section-4.6.2.
This commit is contained in:
Yu Watanabe 2022-10-03 10:12:23 +09:00
parent 167c7ae511
commit a115c60e0d
1 changed files with 8 additions and 0 deletions
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8
src/network/networkd-ndisc.c
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@ -469,6 +469,14 @@ static int ndisc_router_process_prefix(Link *link, sd_ndisc_router *rt) {
if (r < 0)
return log_link_error_errno(link, r, "Failed to get prefix address: %m");
/* RFC 4861 Section 4.6.2:
* A router SHOULD NOT send a prefix option for the link-local prefix and a host SHOULD ignore such
* a prefix option. */
if (in6_addr_is_link_local(&a)) {
log_link_debug(link, "Received link-local prefix, ignoring autonomous prefix.");
return 0;
}
r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get prefix length: %m");