network: Add support to select an IPv4 link-local start address

1 files changed, 41 insertions, 0 deletions

diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
index 67eb9d2aa1..8833bee233 100644
--- a/src/network/networkd-ipv4ll.c
+++ b/src/network/networkd-ipv4ll.c
@@ -263,3 +263,44 @@ int config_parse_ipv4ll(
 
         return 0;
 }
+
+int config_parse_ipv4ll_address(
+                const char* unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        union in_addr_union a;
+        struct in_addr *ipv4ll_address = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                *ipv4ll_address = (struct in_addr) {};
+                return 0;
+        }
+
+        r = in_addr_from_string(AF_INET, rvalue, &a);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
+                return 0;
+        }
+        if (!in4_addr_is_link_local(&a.in)) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Not a IPv4 link local address, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        *ipv4ll_address = a.in;
+        return 0;
+}