network: move config_parse_uplink() to networkd-dhcp-common.[ch]

1 files changed, 66 insertions, 0 deletions

diff --git a/src/network/networkd-dhcp-common.c b/src/network/networkd-dhcp-common.c
index 7a769988ec..3a77a45780 100644
--- a/src/network/networkd-dhcp-common.c
+++ b/src/network/networkd-dhcp-common.c
@@ -1267,3 +1267,69 @@ int config_parse_network_duid_rawdata(
         /* For backward compatibility, also set DHCPv6 DUID if not specified explicitly. */
         return config_parse_duid_rawdata(unit, filename, line, section, section_line, lvalue, false, rvalue, &network->dhcp6_duid, network);
 }
+
+int config_parse_uplink(
+                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) {
+
+        Network *network = userdata;
+        int *index, r;
+        char **name;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (streq(section, "DHCPServer")) {
+                index = &network->dhcp_server_uplink_index;
+                name = &network->dhcp_server_uplink_name;
+        } else if (streq(section, "IPv6SendRA")) {
+                index = &network->router_uplink_index;
+                name = &network->router_uplink_name;
+        } else
+                assert_not_reached();
+
+        if (isempty(rvalue) || streq(rvalue, ":auto")) {
+                *index = UPLINK_INDEX_AUTO;
+                *name = mfree(*name);
+                return 0;
+        }
+
+        if (streq(rvalue, ":none")) {
+                *index = UPLINK_INDEX_NONE;
+                *name = mfree(*name);
+                return 0;
+        }
+
+        r = parse_ifindex(rvalue);
+        if (r > 0) {
+                *index = r;
+                *name = mfree(*name);
+                return 0;
+        }
+
+        if (!ifname_valid_full(rvalue, IFNAME_VALID_ALTERNATIVE)) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Invalid interface name in %s=, ignoring assignment: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        /* The interface name will be resolved later. */
+        r = free_and_strdup_warn(name, rvalue);
+        if (r < 0)
+                return r;
+
+        /* Note, if uplink_name is set, then uplink_index will be ignored. So, the below does not mean
+         * an uplink interface will be selected automatically. */
+        *index = UPLINK_INDEX_AUTO;
+        return 0;
+}