net/phonet/socket.c

Source file repositories/reference/linux-study-clean/net/phonet/socket.c

File Facts

System
Linux kernel
Corpus path
net/phonet/socket.c
Extension
.c
Size
17140 bytes
Lines
779
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

const struct proto_ops phonet_dgram_ops = {
	.family		= AF_PHONET,
	.owner		= THIS_MODULE,
	.release	= pn_socket_release,
	.bind		= pn_socket_bind,
	.connect	= sock_no_connect,
	.socketpair	= sock_no_socketpair,
	.accept		= sock_no_accept,
	.getname	= pn_socket_getname,
	.poll		= datagram_poll,
	.ioctl		= pn_socket_ioctl,
	.listen		= sock_no_listen,
	.shutdown	= sock_no_shutdown,
	.sendmsg	= pn_socket_sendmsg,
	.recvmsg	= sock_common_recvmsg,
	.mmap		= sock_no_mmap,
};

const struct proto_ops phonet_stream_ops = {
	.family		= AF_PHONET,
	.owner		= THIS_MODULE,
	.release	= pn_socket_release,
	.bind		= pn_socket_bind,
	.connect	= pn_socket_connect,
	.socketpair	= sock_no_socketpair,
	.accept		= pn_socket_accept,
	.getname	= pn_socket_getname,
	.poll		= pn_socket_poll,
	.ioctl		= pn_socket_ioctl,
	.listen		= pn_socket_listen,
	.shutdown	= sock_no_shutdown,
	.setsockopt	= sock_common_setsockopt,
	.getsockopt	= sock_common_getsockopt,
	.sendmsg	= pn_socket_sendmsg,
	.recvmsg	= sock_common_recvmsg,
	.mmap		= sock_no_mmap,
};
EXPORT_SYMBOL(phonet_stream_ops);

/* allocate port for a socket */
int pn_sock_get_port(struct sock *sk, unsigned short sport)
{
	static int port_cur;
	struct net *net = sock_net(sk);
	struct pn_sock *pn = pn_sk(sk);
	struct sockaddr_pn try_sa;
	struct sock *tmpsk;

	memset(&try_sa, 0, sizeof(struct sockaddr_pn));
	try_sa.spn_family = AF_PHONET;
	WARN_ON(!mutex_is_locked(&port_mutex));
	if (!sport) {
		/* search free port */
		int port, pmin, pmax;

		phonet_get_local_port_range(&pmin, &pmax);
		for (port = pmin; port <= pmax; port++) {
			port_cur++;
			if (port_cur < pmin || port_cur > pmax)
				port_cur = pmin;

			pn_sockaddr_set_port(&try_sa, port_cur);
			tmpsk = pn_find_sock_by_sa(net, &try_sa);
			if (tmpsk == NULL) {
				sport = port_cur;
				goto found;
			} else
				sock_put(tmpsk);
		}
	} else {
		/* try to find specific port */
		pn_sockaddr_set_port(&try_sa, sport);
		tmpsk = pn_find_sock_by_sa(net, &try_sa);
		if (tmpsk == NULL)
			/* No sock there! We can use that port... */
			goto found;
		else
			sock_put(tmpsk);
	}
	/* the port must be in use already */
	return -EADDRINUSE;

found:
	pn->sobject = pn_object(pn_addr(pn->sobject), sport);
	return 0;
}
EXPORT_SYMBOL(pn_sock_get_port);

#ifdef CONFIG_PROC_FS
static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)

Annotation

Implementation Notes