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network: route: set link ifindex when multi-path routes specified without interface name

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And do not set RTA_OIF attribute when multi-path routes are specified.
See kernel's fib_get_nhs() in net/ipv4/fib_semantics.c.

Fixes #19890.
This commit is contained in:
Yu Watanabe 2021-06-12 05:34:49 +09:00
parent 756755d0fc
commit 08c2fcdc0d
1 changed files with 12 additions and 6 deletions
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18
src/network/networkd-route.c
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@ -967,7 +967,9 @@ static int route_set_netlink_message(const Route *route, sd_netlink_message *req
return log_link_error_errno(link, r, "Could not append RTA_TABLE attribute: %m");
}
if (!route_type_is_reject(route) && route->nexthop_id == 0) {
if (!route_type_is_reject(route) &&
route->nexthop_id == 0 &&
ordered_set_isempty(route->multipath_routes)) {
assert(link); /* Those routes must be attached to a specific link */
r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
@ -1358,7 +1360,7 @@ static int route_add_and_setup_timer(Link *link, const Route *route, unsigned *r
return 0;
}
static int append_nexthop_one(const Route *route, const MultipathRoute *m, struct rtattr **rta, size_t offset) {
static int append_nexthop_one(const Link *link, const Route *route, const MultipathRoute *m, struct rtattr **rta, size_t offset) {
struct rtnexthop *rtnh;
struct rtattr *new_rta;
int r;
@ -1376,7 +1378,7 @@ static int append_nexthop_one(const Route *route, const MultipathRoute *m, struc
rtnh = (struct rtnexthop *)((uint8_t *) *rta + offset);
*rtnh = (struct rtnexthop) {
.rtnh_len = sizeof(*rtnh),
.rtnh_ifindex = m->ifindex,
.rtnh_ifindex = m->ifindex > 0 ? m->ifindex : link->ifindex,
.rtnh_hops = m->weight,
};
@ -1403,13 +1405,17 @@ clear:
return r;
}
static int append_nexthops(const Route *route, sd_netlink_message *req) {
static int append_nexthops(const Link *link, const Route *route, sd_netlink_message *req) {
_cleanup_free_ struct rtattr *rta = NULL;
struct rtnexthop *rtnh;
MultipathRoute *m;
size_t offset;
int r;
assert(link);
assert(route);
assert(req);
if (ordered_set_isempty(route->multipath_routes))
return 0;
@ -1424,7 +1430,7 @@ static int append_nexthops(const Route *route, sd_netlink_message *req) {
offset = (uint8_t *) RTA_DATA(rta) - (uint8_t *) rta;
ORDERED_SET_FOREACH(m, route->multipath_routes) {
r = append_nexthop_one(route, m, &rta, offset);
r = append_nexthop_one(link, route, m, &rta, offset);
if (r < 0)
return r;
@ -1561,7 +1567,7 @@ static int route_configure(
assert(route->nexthop_id == 0);
assert(!in_addr_is_set(route->gw_family, &route->gw));
r = append_nexthops(route, req);
r = append_nexthops(link, route, req);
if (r < 0)
return log_link_error_errno(link, r, "Could not append RTA_MULTIPATH attribute: %m");
}