socket: expose IP_TRANSPARENT

7 files changed, 23 insertions, 0 deletions

diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml
index 22567d483e..53502667e5 100644
--- a/man/systemd.socket.xml
+++ b/man/systemd.socket.xml
@@ -507,6 +507,14 @@
                         </varlistentry>
 
                         <varlistentry>
+                                <term><varname>Transparent=</varname></term>
+                                <listitem><para>Takes a boolean
+                                value. Controls the IP_TRANSPARENT
+                                option. Defaults to
+                                <option>false</option>.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
                                 <term><varname>TCPCongestion=</varname></term>
                                 <listitem><para>Takes a string
                                 value. Controls the TCP congestion
diff --git a/src/dbus-socket.c b/src/dbus-socket.c
index 3ec78a0f4c..f6edc8016d 100644
--- a/src/dbus-socket.c
+++ b/src/dbus-socket.c
@@ -49,6 +49,7 @@
         "  <property name=\"IPTTL\" type=\"i\" access=\"read\"/>\n"     \
         "  <property name=\"PipeSize\" type=\"t\" access=\"read\"/>\n"  \
         "  <property name=\"FreeBind\" type=\"b\" access=\"read\"/>\n"  \
+        "  <property name=\"Transparent\" type=\"b\" access=\"read\"/>\n" \
         "  <property name=\"Mark\" type=\"i\" access=\"read\"/>\n"      \
         "  <property name=\"MaxConnections\" type=\"u\" access=\"read\"/>\n" \
         "  <property name=\"NAccepted\" type=\"u\" access=\"read\"/>\n" \
@@ -107,6 +108,7 @@ DBusHandlerResult bus_socket_message_handler(Unit *u, DBusConnection *c, DBusMes
                 { "org.freedesktop.systemd1.Socket", "IPTTL",          bus_property_append_int,          "i", &u->socket.ip_ttl          },
                 { "org.freedesktop.systemd1.Socket", "PipeSize",       bus_property_append_size,         "t", &u->socket.pipe_size       },
                 { "org.freedesktop.systemd1.Socket", "FreeBind",       bus_property_append_bool,         "b", &u->socket.free_bind       },
+                { "org.freedesktop.systemd1.Socket", "Transparent",    bus_property_append_bool,         "b", &u->socket.transparent     },
                 { "org.freedesktop.systemd1.Socket", "Mark",           bus_property_append_int,          "i", &u->socket.mark            },
                 { "org.freedesktop.systemd1.Socket", "MaxConnections", bus_property_append_unsigned,     "u", &u->socket.max_connections },
                 { "org.freedesktop.systemd1.Socket", "NConnections",   bus_property_append_unsigned,     "u", &u->socket.n_connections   },
diff --git a/src/load-fragment.c b/src/load-fragment.c
index 321214ef46..dbb0762013 100644
--- a/src/load-fragment.c
+++ b/src/load-fragment.c
@@ -1995,6 +1995,7 @@ static int load_from_path(Unit *u, const char *path) {
                 { "Mark",                   config_parse_int,             0, &u->socket.mark,                                 "Socket"  },
                 { "PipeSize",               config_parse_size,            0, &u->socket.pipe_size,                            "Socket"  },
                 { "FreeBind",               config_parse_bool,            0, &u->socket.free_bind,                            "Socket"  },
+                { "Transparent",            config_parse_bool,            0, &u->socket.transparent,                          "Socket"  },
                 { "TCPCongestion",          config_parse_string,          0, &u->socket.tcp_congestion,                       "Socket"  },
                 { "MessageQueueMaxMessages", config_parse_long,           0, &u->socket.mq_maxmsg,                            "Socket"  },
                 { "MessageQueueMessageSize", config_parse_long,           0, &u->socket.mq_msgsize,                           "Socket"  },
diff --git a/src/socket-util.c b/src/socket-util.c
index 779850d37f..e2e89886d4 100644
--- a/src/socket-util.c
+++ b/src/socket-util.c
@@ -389,6 +389,7 @@ int socket_address_listen(
                 SocketAddressBindIPv6Only only,
                 const char *bind_to_device,
                 bool free_bind,
+                bool transparent,
                 mode_t directory_mode,
                 mode_t socket_mode,
                 const char *label,
@@ -433,6 +434,12 @@ int socket_address_listen(
                         if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
                                 log_warning("IP_FREEBIND failed: %m");
                 }
+
+                if (transparent) {
+                        one = 1;
+                        if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0)
+                                log_warning("IP_TRANSPARENT failed: %m");
+                }
         }
 
         one = 1;
diff --git a/src/socket-util.h b/src/socket-util.h
index 0e891ec2b2..8ccbd371cf 100644
--- a/src/socket-util.h
+++ b/src/socket-util.h
@@ -78,6 +78,7 @@ int socket_address_listen(
                 SocketAddressBindIPv6Only only,
                 const char *bind_to_device,
                 bool free_bind,
+                bool transparent,
                 mode_t directory_mode,
                 mode_t socket_mode,
                 const char *label,
diff --git a/src/socket.c b/src/socket.c
index 6c935c4201..e8b2d968d6 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -404,6 +404,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 "%sDirectoryMode: %04o\n"
                 "%sKeepAlive: %s\n"
                 "%sFreeBind: %s\n"
+                "%sTransparent: %s\n"
                 "%sTCPCongestion: %s\n",
                 prefix, socket_state_to_string(s->state),
                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
@@ -412,6 +413,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 prefix, s->directory_mode,
                 prefix, yes_no(s->keep_alive),
                 prefix, yes_no(s->free_bind),
+                prefix, yes_no(s->transparent),
                 prefix, strna(s->tcp_congestion));
 
         if (s->control_pid > 0)
@@ -897,6 +899,7 @@ static int socket_open_fds(Socket *s) {
                                              s->bind_ipv6_only,
                                              s->bind_to_device,
                                              s->free_bind,
+                                             s->transparent,
                                              s->directory_mode,
                                              s->socket_mode,
                                              label,
diff --git a/src/socket.h b/src/socket.h
index 01ea48d62f..92f11d72ea 100644
--- a/src/socket.h
+++ b/src/socket.h
@@ -116,6 +116,7 @@ struct Socket {
         /* Socket options */
         bool keep_alive;
         bool free_bind;
+        bool transparent;
         int priority;
         int mark;
         size_t receive_buffer;