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networkd: handle ignoring ll gateway being link ll

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In the event where network discovery gets a route with the gateway being
the interfaces local link address, networkd will fail the interface.

systemd-networkd[44319]: br_lan: Configuring route: dst: fdcd:41a4:5559:ec03::/64, src: n/a, gw: fe80::e4da:7eff:fe77:5c5e, prefsrc: n/a, scope: global, table: main, proto: ra, type: unicast
systemd-networkd[44319]: br_lan: Could not set NDisc route or address: Gateway can not be a local address. Invalid argument
systemd-networkd[44319]: br_lan: Failed
systemd-networkd[44319]: br_lan: State changed: configuring -> failed

This patch, instead of allowing the interface to fail, will instead log
the event and skip setting the route.
This commit is contained in:
Devon Pringle 2020-12-14 14:22:18 +10:00 committed by Zbigniew Jędrzejewski-Szmek
parent 199f75205b
commit 221019166f
1 changed files with 13 additions and 3 deletions
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16
src/network/networkd-ndisc.c
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@ -820,7 +820,7 @@ static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) {
static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
_cleanup_(route_freep) Route *route = NULL;
struct in6_addr gateway;
union in_addr_union gateway;
uint32_t lifetime;
unsigned preference, prefixlen;
usec_t time_now;
@ -835,10 +835,20 @@ static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
if (lifetime == 0)
return 0;
r = sd_ndisc_router_get_address(rt, &gateway);
r = sd_ndisc_router_get_address(rt, &gateway.in6);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m");
if (link_has_ipv6_address(link, &gateway.in6) == 0) {
_cleanup_free_ char *buf = NULL;
if (DEBUG_LOGGING) {
(void) in_addr_to_string(AF_INET6, &gateway, &buf);
log_link_debug(link, "Advertised route gateway, %s, is local to the link, ignoring route", strnull(buf));
}
return 0;
}
r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get route prefix length: %m");
@ -860,7 +870,7 @@ static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
route->priority = link->network->dhcp6_route_metric;
route->protocol = RTPROT_RA;
route->pref = preference;
route->gw.in6 = gateway;
route->gw.in6 = gateway.in6;
route->gw_family = AF_INET6;
route->dst_prefixlen = prefixlen;
route->lifetime = time_now + lifetime * USEC_PER_SEC;