sd-netlink: add MDB types

These are used to configure multicast membership entries of bridge ports.

src/libsystemd/sd-netlink/netlink-types.c

@@ -968,6 +968,15 @@ static const NLTypeSystem rtnl_tca_type_system = {
         .types = rtnl_tca_types,
 };
 
+static const NLType mdb_types[] = {
+        [MDBA_SET_ENTRY]     = { .size = sizeof(struct br_port_msg) },
+};
+
+static const NLTypeSystem rtnl_mdb_type_system = {
+        .count = ELEMENTSOF(mdb_types),
+        .types = mdb_types,
+};
+
 static const NLType error_types[] = {
         [NLMSGERR_ATTR_MSG]  = { .type = NETLINK_TYPE_STRING },
         [NLMSGERR_ATTR_OFFS] = { .type = NETLINK_TYPE_U32 },
@@ -1012,6 +1021,9 @@ static const NLType rtnl_types[] = {
         [RTM_NEWTCLASS]    = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_tca_type_system, .size = sizeof(struct tcmsg) },
         [RTM_DELTCLASS]    = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_tca_type_system, .size = sizeof(struct tcmsg) },
         [RTM_GETTCLASS]    = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_tca_type_system, .size = sizeof(struct tcmsg) },
+        [RTM_NEWMDB]       = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_mdb_type_system, .size = sizeof(struct br_port_msg) },
+        [RTM_DELMDB]       = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_mdb_type_system, .size = sizeof(struct br_port_msg) },
+        [RTM_GETMDB]       = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_mdb_type_system, .size = sizeof(struct br_port_msg) },
 };
 
 const NLTypeSystem rtnl_type_system_root = {

src/libsystemd/sd-netlink/netlink-util.h

@@ -51,6 +51,10 @@ static inline bool rtnl_message_type_is_tclass(uint16_t type) {
         return IN_SET(type, RTM_NEWTCLASS, RTM_DELTCLASS, RTM_GETTCLASS);
 }
 
+static inline bool rtnl_message_type_is_mdb(uint16_t type) {
+        return IN_SET(type, RTM_NEWMDB, RTM_DELMDB, RTM_GETMDB);
+}
+
 int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name);
 int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias, const struct ether_addr *mac, uint32_t mtu);
 int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret);

src/libsystemd/sd-netlink/rtnl-message.c

@@ -2,6 +2,7 @@
 
 #include <netinet/in.h>
 #include <linux/if_addrlabel.h>
+#include <linux/if_bridge.h>
 #include <linux/nexthop.h>
 #include <stdbool.h>
 #include <unistd.h>
@@ -1120,3 +1121,24 @@ int sd_rtnl_message_set_tclass_handle(sd_netlink_message *m, uint32_t handle) {
 
         return 0;
 }
+
+int sd_rtnl_message_new_mdb(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int mdb_ifindex) {
+        struct br_port_msg *bpm;
+        int r;
+
+        assert_return(rtnl_message_type_is_mdb(nlmsg_type), -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(rtnl, ret, nlmsg_type);
+        if (r < 0)
+                return r;
+
+        if (nlmsg_type == RTM_NEWMDB)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+        bpm = NLMSG_DATA((*ret)->hdr);
+        bpm->family = AF_BRIDGE;
+        bpm->ifindex = mdb_ifindex;
+
+        return 0;
+}

src/systemd/sd-netlink.h

@@ -216,6 +216,8 @@ int sd_rtnl_message_new_tclass(sd_netlink *rtnl, sd_netlink_message **ret, uint1
 int sd_rtnl_message_set_tclass_parent(sd_netlink_message *m, uint32_t parent);
 int sd_rtnl_message_set_tclass_handle(sd_netlink_message *m, uint32_t handle);
 
+int sd_rtnl_message_new_mdb(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int mdb_ifindex);
+
 /* genl */
 int sd_genl_socket_open(sd_netlink **nl);
 int sd_genl_message_new(sd_netlink *nl, sd_genl_family family, uint8_t cmd, sd_netlink_message **m);