52 		struct cmsghdr *cm;  in do_send()  local
54 		cm = (void *)control;  in do_send()
55 		cm->cmsg_len = CMSG_LEN(sizeof(flowlabel));  in do_send()
56 		cm->cmsg_level = SOL_IPV6;  in do_send()
57 		cm->cmsg_type = IPV6_FLOWINFO;  in do_send()
58 		*(uint32_t *)CMSG_DATA(cm) = htonl(flowlabel);  in do_send()
80 	struct cmsghdr *cm;  in do_recv()  local
104 	cm = CMSG_FIRSTHDR(&msg);  in do_recv()
106 		if (!cm)  in do_recv()
108 		if (CMSG_NXTHDR(&msg, cm))  in do_recv()
110 		if (cm->cmsg_level != SOL_IPV6 ||  in do_recv()
111 		    cm->cmsg_type != IPV6_FLOWINFO)  in do_recv()
114 		flowlabel = ntohl(*(uint32_t *)CMSG_DATA(cm));  in do_recv()