networkd: set route protocol

All routes added by networkd are currently set RTPROT_BOOT, which according
to the kernel means "Route installed during boot" (rtnetlink.h).  But this
is not always the case as networkd changes routing after boot too.  Since
the kernel gives more detailed protocols, use them.

With this patch, user-configured static routes now use RTPROT_STATIC (which
they are) and DHCP routes use RTPROT_DHCP.  There is no define for IPv4LL
yet, so those are installed as RTPROT_STATIC (though perhaps RTPROT_RA is
better?).

[tomegun: fixup
src/network/networkd-link.c:972:33: error: too few arguments to function 'route_new_dynamic']

6 files changed, 22 insertions, 16 deletions

diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index 7f2e398b7..c50d0ea98 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -133,7 +133,8 @@ int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) {
 }
 
 int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
-                              uint16_t nlmsg_type, int rtm_family) {
+                              uint16_t nlmsg_type, int rtm_family,
+                              unsigned char rtm_protocol) {
         struct rtmsg *rtm;
         int r;
 
@@ -154,7 +155,7 @@ int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
         rtm->rtm_scope = RT_SCOPE_UNIVERSE;
         rtm->rtm_type = RTN_UNICAST;
         rtm->rtm_table = RT_TABLE_MAIN;
-        rtm->rtm_protocol = RTPROT_BOOT;
+        rtm->rtm_protocol = rtm_protocol;
 
         return 0;
 }
diff --git a/src/libsystemd/sd-rtnl/test-rtnl.c b/src/libsystemd/sd-rtnl/test-rtnl.c
index 082c9e4a0..4b6e5339d 100644
--- a/src/libsystemd/sd-rtnl/test-rtnl.c
+++ b/src/libsystemd/sd-rtnl/test-rtnl.c
@@ -132,7 +132,7 @@ static void test_route(void) {
         uint32_t index = 2, u32_data;
         int r;
 
-        r = sd_rtnl_message_new_route(NULL, &req, RTM_NEWROUTE, AF_INET);
+        r = sd_rtnl_message_new_route(NULL, &req, RTM_NEWROUTE, AF_INET, RTPROT_STATIC);
         if (r < 0) {
                 log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
                 return;
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 0a6f52408..86d4b83d3 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -415,7 +415,7 @@ static int link_set_dhcp_routes(Link *link) {
         for (i = 0; i < n; i++) {
                 _cleanup_route_free_ Route *route = NULL;
 
-                r = route_new_dynamic(&route);
+                r = route_new_dynamic(&route, RTPROT_DHCP);
                 if (r < 0) {
                         log_error_link(link, "Could not allocate route: %s",
                                        strerror(-r));
@@ -481,7 +481,7 @@ static int link_enter_set_routes(Link *link) {
                 }
 
                 if (r != -ENOENT) {
-                        r = route_new_dynamic(&route);
+                        r = route_new_dynamic(&route, RTPROT_STATIC);
                         if (r < 0) {
                                 log_error_link(link, "Could not allocate route: %s",
                                                strerror(-r));
@@ -517,14 +517,14 @@ static int link_enter_set_routes(Link *link) {
                 }
 
                 if (r >= 0) {
-                        r = route_new_dynamic(&route);
+                        r = route_new_dynamic(&route, RTPROT_DHCP);
                         if (r < 0) {
                                 log_error_link(link, "Could not allocate route: %s",
                                                strerror(-r));
                                 return r;
                         }
 
-                        r = route_new_dynamic(&route_gw);
+                        r = route_new_dynamic(&route_gw, RTPROT_DHCP);
                         if (r < 0) {
                                 log_error_link(link, "Could not allocate route: %s",
                                                strerror(-r));
@@ -969,7 +969,7 @@ static int dhcp_lease_lost(Link *link) {
                         for (i = 0; i < n; i++) {
                                 _cleanup_route_free_ Route *route = NULL;
 
-                                r = route_new_dynamic(&route);
+                                r = route_new_dynamic(&route, RTPROT_UNSPEC);
                                 if (r >= 0) {
                                         route->family = AF_INET;
                                         route->in_addr.in = routes[i].gw_addr;
@@ -989,7 +989,7 @@ static int dhcp_lease_lost(Link *link) {
                         _cleanup_route_free_ Route *route_gw = NULL;
                         _cleanup_route_free_ Route *route = NULL;
 
-                        r = route_new_dynamic(&route_gw);
+                        r = route_new_dynamic(&route_gw, RTPROT_UNSPEC);
                         if (r >= 0) {
                                 route_gw->family = AF_INET;
                                 route_gw->dst_addr.in = gateway;
@@ -999,7 +999,7 @@ static int dhcp_lease_lost(Link *link) {
                                 route_drop(route_gw, link, &route_drop_handler);
                         }
 
-                        r = route_new_dynamic(&route);
+                        r = route_new_dynamic(&route, RTPROT_UNSPEC);
                         if (r >= 0) {
                                 route->family = AF_INET;
                                 route->in_addr.in = gateway;
@@ -1316,7 +1316,7 @@ static int ipv4ll_address_lost(Link *link) {
 
                 address_drop(address, link, &address_drop_handler);
 
-                r = route_new_dynamic(&route);
+                r = route_new_dynamic(&route, RTPROT_UNSPEC);
                 if (r < 0) {
                         log_error_link(link, "Could not allocate route: %s",
                                        strerror(-r));
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index 894929940..00fd9528c 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -49,6 +49,7 @@ int route_new_static(Network *network, unsigned section, Route **ret) {
 
         route->family = AF_UNSPEC;
         route->scope = RT_SCOPE_UNIVERSE;
+        route->protocol = RTPROT_STATIC;
 
         route->network = network;
 
@@ -65,7 +66,7 @@ int route_new_static(Network *network, unsigned section, Route **ret) {
         return 0;
 }
 
-int route_new_dynamic(Route **ret) {
+int route_new_dynamic(Route **ret, unsigned char rtm_protocol) {
         _cleanup_route_free_ Route *route = NULL;
 
         route = new0(Route, 1);
@@ -74,6 +75,7 @@ int route_new_dynamic(Route **ret) {
 
         route->family = AF_UNSPEC;
         route->scope = RT_SCOPE_UNIVERSE;
+        route->protocol = rtm_protocol;
 
         *ret = route;
         route = NULL;
@@ -108,7 +110,8 @@ int route_drop(Route *route, Link *link,
         assert(route->family == AF_INET || route->family == AF_INET6);
 
         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
-                                      RTM_DELROUTE, route->family);
+                                      RTM_DELROUTE, route->family,
+                                      route->protocol);
         if (r < 0) {
                 log_error("Could not create RTM_DELROUTE message: %s", strerror(-r));
                 return r;
@@ -181,7 +184,8 @@ int route_configure(Route *route, Link *link,
         assert(route->family == AF_INET || route->family == AF_INET6);
 
         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
-                                      RTM_NEWROUTE, route->family);
+                                      RTM_NEWROUTE, route->family,
+                                      route->protocol);
         if (r < 0) {
                 log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
                 return r;
diff --git a/src/network/networkd.h b/src/network/networkd.h
index f1c7f204e..7d291e5ea 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -137,6 +137,7 @@ struct Route {
         unsigned char dst_prefixlen;
         unsigned char scope;
         uint32_t metrics;
+        unsigned char protocol;  /* RTPROT_* */
 
         union in_addr_union in_addr;
         union in_addr_union dst_addr;
@@ -305,7 +306,7 @@ const struct ConfigPerfItem* network_network_gperf_lookup(const char *key, unsig
 
 /* Route */
 int route_new_static(Network *network, unsigned section, Route **ret);
-int route_new_dynamic(Route **ret);
+int route_new_dynamic(Route **ret, unsigned char rtm_protocol);
 void route_free(Route *route);
 int route_configure(Route *route, Link *link, sd_rtnl_message_handler_t callback);
 int route_drop(Route *route, Link *link, sd_rtnl_message_handler_t callback);
diff --git a/src/systemd/sd-rtnl.h b/src/systemd/sd-rtnl.h
index 5cd26d98c..47bb232ff 100644
--- a/src/systemd/sd-rtnl.h
+++ b/src/systemd/sd-rtnl.h
@@ -72,7 +72,7 @@ int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret, int in
 int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t msg_type, int index,
                              int family);
 int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t nlmsg_type,
-                              int rtm_family);
+                              int rtm_family, unsigned char rtm_protocol);
 
 sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m);
 sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m);