route-table: Store route priority.

The route-table code is useful outside the scope of Open vSwitch.
In a subsequent patch we will expose the route-table data
structures to allow projects compiling against the private Open
vSwitch library to consume this data.

Store the route priority so that other consumers may read this
data if relevant to them.

Co-Authored-by: Felix Huettner <[email protected]>
Signed-off-by: Felix Huettner <[email protected]>
Signed-off-by: Frode Nordahl <[email protected]>
Signed-off-by: 0-day Robot <[email protected]>

lib/route-table.c

@@ -59,6 +59,7 @@ struct route_data {
     char ifname[IFNAMSIZ]; /* Interface name. */
     uint32_t mark;
     uint32_t rta_table_id; /* 0 if missing. */
+    uint32_t rta_priority; /* 0 if missing. */
 };
 
 /* A digested version of a route message sent down by the kernel to indicate
@@ -235,6 +236,7 @@ route_table_parse(struct ofpbuf *buf, void *change_)
         [RTA_MARK] = { .type = NL_A_U32, .optional = true },
         [RTA_PREFSRC] = { .type = NL_A_U32, .optional = true },
         [RTA_TABLE] = { .type = NL_A_U32, .optional = true },
+        [RTA_PRIORITY] = { .type = NL_A_U32, .optional = true },
     };
 
     static const struct nl_policy policy6[] = {
@@ -244,6 +246,7 @@ route_table_parse(struct ofpbuf *buf, void *change_)
         [RTA_GATEWAY] = { .type = NL_A_IPV6, .optional = true },
         [RTA_PREFSRC] = { .type = NL_A_IPV6, .optional = true },
         [RTA_TABLE] = { .type = NL_A_U32, .optional = true },
+        [RTA_PRIORITY] = { .type = NL_A_U32, .optional = true },
     };
 
     struct nlattr *attrs[ARRAY_SIZE(policy)];
@@ -338,6 +341,9 @@ route_table_parse(struct ofpbuf *buf, void *change_)
         if (attrs[RTA_MARK]) {
             change->rd.mark = nl_attr_get_u32(attrs[RTA_MARK]);
         }
+        if (attrs[RTA_PRIORITY]) {
+            change->rd.rta_priority = nl_attr_get_u32(attrs[RTA_PRIORITY]);
+        }
     } else {
         VLOG_DBG_RL(&rl, "received unparseable rtnetlink route message");
         return 0;