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| author | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-10-03 03:12:23 +0200 |
|---|---|---|
| committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-10-03 17:25:14 +0200 |
| commit | a115c60e0de034c81d10f9ecad3045aa663884b7 (patch) | |
| tree | 9b8e8739ae39ea21d5dd354da9df762dd117ac82 /src/network/networkd-ndisc.c | |
| parent | network: ndisc: read prefix earlier (diff) | |
| download | systemd-a115c60e0de034c81d10f9ecad3045aa663884b7.tar.xz systemd-a115c60e0de034c81d10f9ecad3045aa663884b7.zip | |
network: ndisc: ignore prefix option with link-local prefix
See https://www.rfc-editor.org/rfc/rfc4861#section-4.6.2.
Diffstat (limited to '')
| -rw-r--r-- | src/network/networkd-ndisc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c index b1201eb00b..e992ebd1a9 100644 --- a/src/network/networkd-ndisc.c +++ b/src/network/networkd-ndisc.c @@ -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"); |