network: dhcp6pd: set lifetime to routes for assigned prefixes

Note that the kernel (at least 5.14.11) seems not to support lifetime
for IPv6 unreachable routes. The lifetime for routes of the type will be
handled by sd-event's timer event source.
So, we cannot confirm the lifetime with 'ip route' command.

1 files changed, 16 insertions, 5 deletions

diff --git a/src/network/networkd-dhcp6.c b/src/network/networkd-dhcp6.c
index 6ec178f354..0795ebdd46 100644
--- a/src/network/networkd-dhcp6.c
+++ b/src/network/networkd-dhcp6.c
@@ -288,7 +288,7 @@ static int dhcp6_pd_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link
         return 1;
 }
 
-static int dhcp6_pd_request_route(Link *link, const struct in6_addr *prefix) {
+static int dhcp6_pd_request_route(Link *link, const struct in6_addr *prefix, usec_t timestamp_usec, uint32_t lifetime_sec) {
         _cleanup_(route_freep) Route *route = NULL;
         Route *existing;
         int r;
@@ -310,6 +310,7 @@ static int dhcp6_pd_request_route(Link *link, const struct in6_addr *prefix) {
         route->dst_prefixlen = 64;
         route->protocol = RTPROT_DHCP;
         route->priority = link->network->dhcp6_pd_route_metric;
+        route->lifetime = usec_add(timestamp_usec, lifetime_sec * USEC_PER_SEC);
 
         if (route_get(NULL, link, route, &existing) < 0)
                 link->dhcp6_pd_configured = false;
@@ -420,6 +421,7 @@ static int dhcp6_pd_request_address(
 static int dhcp6_pd_assign_prefix(
                 Link *link,
                 const struct in6_addr *prefix,
+                usec_t timestamp_usec,
                 uint32_t lifetime_preferred,
                 uint32_t lifetime_valid) {
 
@@ -435,7 +437,7 @@ static int dhcp6_pd_assign_prefix(
                         return r;
         }
 
-        r = dhcp6_pd_request_route(link, prefix);
+        r = dhcp6_pd_request_route(link, prefix, timestamp_usec, lifetime_valid);
         if (r < 0)
                 return r;
 
@@ -527,6 +529,7 @@ static int dhcp6_pd_prefix_distribute(
                 Link *dhcp6_link,
                 const struct in6_addr *pd_prefix,
                 uint8_t pd_prefix_len,
+                usec_t timestamp_usec,
                 uint32_t lifetime_preferred,
                 uint32_t lifetime_valid,
                 bool assign_preferred_subnet_id) {
@@ -560,7 +563,7 @@ static int dhcp6_pd_prefix_distribute(
                         continue;
 
                 (void) in6_addr_prefix_to_string(&assigned_prefix, 64, &buf);
-                r = dhcp6_pd_assign_prefix(link, &assigned_prefix, lifetime_preferred, lifetime_valid);
+                r = dhcp6_pd_assign_prefix(link, &assigned_prefix, timestamp_usec, lifetime_preferred, lifetime_valid);
                 if (r < 0) {
                         log_link_warning_errno(link, r, "Failed to assign/update prefix %s: %m", strna(buf));
                         if (link == dhcp6_link)
@@ -746,7 +749,7 @@ static int dhcp6_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *li
         return 1;
 }
 
-static int dhcp6_request_unreachable_route(Link *link, const struct in6_addr *addr, uint8_t prefixlen) {
+static int dhcp6_request_unreachable_route(Link *link, const struct in6_addr *addr, uint8_t prefixlen, usec_t timestamp_usec, uint32_t lifetime_sec) {
         _cleanup_(route_freep) Route *route = NULL;
         _cleanup_free_ char *buf = NULL;
         Route *existing;
@@ -774,6 +777,7 @@ static int dhcp6_request_unreachable_route(Link *link, const struct in6_addr *ad
         route->table = link_get_dhcp6_route_table(link);
         route->type = RTN_UNREACHABLE;
         route->protocol = RTPROT_DHCP;
+        route->lifetime = usec_add(timestamp_usec, lifetime_sec * USEC_PER_SEC);
 
         if (route_get(link->manager, NULL, route, &existing) < 0)
                 link->dhcp6_configured = false;
@@ -826,12 +830,17 @@ static int dhcp6_pd_prefix_add(Link *link, const struct in6_addr *prefix, uint8_
 }
 
 static int dhcp6_pd_prefix_acquired(Link *dhcp6_link) {
+        usec_t timestamp_usec;
         Link *link;
         int r;
 
         assert(dhcp6_link);
         assert(dhcp6_link->dhcp6_lease);
 
+        r = sd_dhcp6_lease_get_timestamp(dhcp6_link->dhcp6_lease, clock_boottime_or_monotonic(), &timestamp_usec);
+        if (r < 0)
+                return log_link_warning_errno(dhcp6_link, r, "Failed to get timestamp of DHCPv6 lease: %m");
+
         HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) {
                 if (link == dhcp6_link)
                         continue;
@@ -857,7 +866,7 @@ static int dhcp6_pd_prefix_acquired(Link *dhcp6_link) {
                 if (r == 0)
                         continue;
 
-                r = dhcp6_request_unreachable_route(dhcp6_link, &pd_prefix, pd_prefix_len);
+                r = dhcp6_request_unreachable_route(dhcp6_link, &pd_prefix, pd_prefix_len, timestamp_usec, lifetime_valid);
                 if (r < 0)
                         return r;
 
@@ -889,6 +898,7 @@ static int dhcp6_pd_prefix_acquired(Link *dhcp6_link) {
                 r = dhcp6_pd_prefix_distribute(dhcp6_link,
                                                &pd_prefix,
                                                pd_prefix_len,
+                                               timestamp_usec,
                                                lifetime_preferred,
                                                lifetime_valid,
                                                true);
@@ -898,6 +908,7 @@ static int dhcp6_pd_prefix_acquired(Link *dhcp6_link) {
                 r = dhcp6_pd_prefix_distribute(dhcp6_link,
                                                &pd_prefix,
                                                pd_prefix_len,
+                                               timestamp_usec,
                                                lifetime_preferred,
                                                lifetime_valid,
                                                false);