+int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) {
+ struct rtattr *rta;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->sealed, -EPERM);
+ assert_return(data, -EINVAL);
+ assert_return(m->rta_offset_tb, -EINVAL);
+ assert_return(type < m->rta_tb_size, -EINVAL);
+
+ if(!m->rta_offset_tb[type])
+ return -ENODATA;
+
+ rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[type]);
+
+ *data = RTA_DATA(rta);
+
+ return RTA_PAYLOAD(rta);
+}
+
+int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if (strnlen(attr_data, r) >= (size_t) r)
+ return -EIO;
+
+ *data = (char *) attr_data;
+
+ return 0;
+}
+
+int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t) r < sizeof(uint8_t))
+ return -EIO;
+
+ *data = *(uint8_t *) attr_data;
+
+ return 0;
+}
+
+int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t) r < sizeof(uint16_t))
+ return -EIO;
+
+ *data = *(uint16_t *) attr_data;
+
+ return 0;
+}
+
+int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t)r < sizeof(uint32_t))
+ return -EIO;
+
+ *data = *(uint32_t *) attr_data;
+
+ return 0;
+}
+
+int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t)r < sizeof(struct ether_addr))
+ return -EIO;
+
+ memcpy(data, attr_data, sizeof(struct ether_addr));
+
+ return 0;
+}
+
+int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t)r < sizeof(struct in_addr))
+ return -EIO;
+
+ memcpy(data, attr_data, sizeof(struct in_addr));
+
+ return 0;
+}
+
+int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) {
+ int r;
+ void *attr_data;
+
+ assert_return(data, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if(r < 0)
+ return r;
+
+ memcpy(data, attr_data, sizeof(struct in6_addr));
+
+ return 0;
+}
+
+int sd_rtnl_message_exit_container(sd_rtnl_message *m) {
+ assert_return(m, -EINVAL);
+ assert_return(m->sealed, -EINVAL);
+ assert_return(m->n_containers > 0, -EINVAL);
+
+ m->n_containers --;
+
+ return 0;
+}
+
+uint32_t rtnl_message_get_serial(sd_rtnl_message *m) {