Fixed MTP to work with TWRP

net/phonet/Kconfig

@@ -0,0 +1,16 @@
+#
+# Phonet protocol
+#
+
+config PHONET
+	tristate "Phonet protocols family"
+	help
+	  The Phone Network protocol (PhoNet) is a packet-oriented
+	  communication protocol developed by Nokia for use with its modems.
+
+	  This is required for Maemo to use cellular data connectivity (if
+	  supported). It can also be used to control Nokia phones
+	  from a Linux computer, although AT commands may be easier to use.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called phonet. If unsure, say N.

net/phonet/Makefile

@@ -0,0 +1,11 @@
+obj-$(CONFIG_PHONET) += phonet.o pn_pep.o
+
+phonet-y := \
+	pn_dev.o \
+	pn_netlink.o \
+	socket.o \
+	datagram.o \
+	sysctl.o \
+	af_phonet.o
+
+pn_pep-y := pep.o pep-gprs.o

net/phonet/af_phonet.c

@@ -0,0 +1,548 @@
+/*
+ * File: af_phonet.c
+ *
+ * Phonet protocols family
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Authors: Sakari Ailus <sakari.ailus@nokia.com>
+ *          Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+
+#include <linux/if_phonet.h>
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+#include <net/phonet/pn_dev.h>
+
+/* Transport protocol registration */
+static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
+
+static struct phonet_protocol *phonet_proto_get(unsigned int protocol)
+{
+	struct phonet_protocol *pp;
+
+	if (protocol >= PHONET_NPROTO)
+		return NULL;
+
+	rcu_read_lock();
+	pp = rcu_dereference(proto_tab[protocol]);
+	if (pp && !try_module_get(pp->prot->owner))
+		pp = NULL;
+	rcu_read_unlock();
+
+	return pp;
+}
+
+static inline void phonet_proto_put(struct phonet_protocol *pp)
+{
+	module_put(pp->prot->owner);
+}
+
+/* protocol family functions */
+
+static int pn_socket_create(struct net *net, struct socket *sock, int protocol,
+			    int kern)
+{
+	struct sock *sk;
+	struct pn_sock *pn;
+	struct phonet_protocol *pnp;
+	int err;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (protocol == 0) {
+		/* Default protocol selection */
+		switch (sock->type) {
+		case SOCK_DGRAM:
+			protocol = PN_PROTO_PHONET;
+			break;
+		case SOCK_SEQPACKET:
+			protocol = PN_PROTO_PIPE;
+			break;
+		default:
+			return -EPROTONOSUPPORT;
+		}
+	}
+
+	pnp = phonet_proto_get(protocol);
+	if (pnp == NULL &&
+	    request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0)
+		pnp = phonet_proto_get(protocol);
+
+	if (pnp == NULL)
+		return -EPROTONOSUPPORT;
+	if (sock->type != pnp->sock_type) {
+		err = -EPROTONOSUPPORT;
+		goto out;
+	}
+
+	sk = sk_alloc(net, PF_PHONET, GFP_KERNEL, pnp->prot);
+	if (sk == NULL) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	sock_init_data(sock, sk);
+	sock->state = SS_UNCONNECTED;
+	sock->ops = pnp->ops;
+	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+	sk->sk_protocol = protocol;
+	pn = pn_sk(sk);
+	pn->sobject = 0;
+	pn->dobject = 0;
+	pn->resource = 0;
+	sk->sk_prot->init(sk);
+	err = 0;
+
+out:
+	phonet_proto_put(pnp);
+	return err;
+}
+
+static const struct net_proto_family phonet_proto_family = {
+	.family = PF_PHONET,
+	.create = pn_socket_create,
+	.owner = THIS_MODULE,
+};
+
+/* Phonet device header operations */
+static int pn_header_create(struct sk_buff *skb, struct net_device *dev,
+				unsigned short type, const void *daddr,
+				const void *saddr, unsigned int len)
+{
+	u8 *media = skb_push(skb, 1);
+
+	if (type != ETH_P_PHONET)
+		return -1;
+
+	if (!saddr)
+		saddr = dev->dev_addr;
+	*media = *(const u8 *)saddr;
+	return 1;
+}
+
+static int pn_header_parse(const struct sk_buff *skb, unsigned char *haddr)
+{
+	const u8 *media = skb_mac_header(skb);
+	*haddr = *media;
+	return 1;
+}
+
+struct header_ops phonet_header_ops = {
+	.create = pn_header_create,
+	.parse = pn_header_parse,
+};
+EXPORT_SYMBOL(phonet_header_ops);
+
+/*
+ * Prepends an ISI header and sends a datagram.
+ */
+static int pn_send(struct sk_buff *skb, struct net_device *dev,
+			u16 dst, u16 src, u8 res, u8 irq)
+{
+	struct phonethdr *ph;
+	int err;
+
+	if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
+	    skb->len + sizeof(struct phonethdr) > dev->mtu) {
+		err = -EMSGSIZE;
+		goto drop;
+	}
+
+	/* Broadcast sending is not implemented */
+	if (pn_addr(dst) == PNADDR_BROADCAST) {
+		err = -EOPNOTSUPP;
+		goto drop;
+	}
+
+	skb_reset_transport_header(skb);
+	WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
+	skb_push(skb, sizeof(struct phonethdr));
+	skb_reset_network_header(skb);
+	ph = pn_hdr(skb);
+	ph->pn_rdev = pn_dev(dst);
+	ph->pn_sdev = pn_dev(src);
+	ph->pn_res = res;
+	ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
+	ph->pn_robj = pn_obj(dst);
+	ph->pn_sobj = pn_obj(src);
+
+	skb->protocol = htons(ETH_P_PHONET);
+	skb->priority = 0;
+	skb->dev = dev;
+
+	if (skb->pkt_type == PACKET_LOOPBACK) {
+		skb_reset_mac_header(skb);
+		skb_orphan(skb);
+		err = (irq ? netif_rx(skb) : netif_rx_ni(skb)) ? -ENOBUFS : 0;
+	} else {
+		err = dev_hard_header(skb, dev, ntohs(skb->protocol),
+					NULL, NULL, skb->len);
+		if (err < 0) {
+			err = -EHOSTUNREACH;
+			goto drop;
+		}
+		err = dev_queue_xmit(skb);
+		if (unlikely(err > 0))
+			err = net_xmit_errno(err);
+	}
+
+	return err;
+drop:
+	kfree_skb(skb);
+	return err;
+}
+
+static int pn_raw_send(const void *data, int len, struct net_device *dev,
+			u16 dst, u16 src, u8 res)
+{
+	struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
+		skb->pkt_type = PACKET_LOOPBACK;
+
+	skb_reserve(skb, MAX_PHONET_HEADER);
+	__skb_put(skb, len);
+	skb_copy_to_linear_data(skb, data, len);
+	return pn_send(skb, dev, dst, src, res, 1);
+}
+
+/*
+ * Create a Phonet header for the skb and send it out. Returns
+ * non-zero error code if failed. The skb is freed then.
+ */
+int pn_skb_send(struct sock *sk, struct sk_buff *skb,
+		const struct sockaddr_pn *target)
+{
+	struct net *net = sock_net(sk);
+	struct net_device *dev;
+	struct pn_sock *pn = pn_sk(sk);
+	int err;
+	u16 src, dst;
+	u8 daddr, saddr, res;
+
+	src = pn->sobject;
+	if (target != NULL) {
+		dst = pn_sockaddr_get_object(target);
+		res = pn_sockaddr_get_resource(target);
+	} else {
+		dst = pn->dobject;
+		res = pn->resource;
+	}
+	daddr = pn_addr(dst);
+
+	err = -EHOSTUNREACH;
+	if (sk->sk_bound_dev_if)
+		dev = dev_get_by_index(net, sk->sk_bound_dev_if);
+	else if (phonet_address_lookup(net, daddr) == 0) {
+		dev = phonet_device_get(net);
+		skb->pkt_type = PACKET_LOOPBACK;
+	} else if (dst == 0) {
+		/* Resource routing (small race until phonet_rcv()) */
+		struct sock *sk = pn_find_sock_by_res(net, res);
+		if (sk)	{
+			sock_put(sk);
+			dev = phonet_device_get(net);
+			skb->pkt_type = PACKET_LOOPBACK;
+		} else
+			dev = phonet_route_output(net, daddr);
+	} else
+		dev = phonet_route_output(net, daddr);
+
+	if (!dev || !(dev->flags & IFF_UP))
+		goto drop;
+
+	saddr = phonet_address_get(dev, daddr);
+	if (saddr == PN_NO_ADDR)
+		goto drop;
+
+	if (!pn_addr(src))
+		src = pn_object(saddr, pn_obj(src));
+
+	err = pn_send(skb, dev, dst, src, res, 0);
+	dev_put(dev);
+	return err;
+
+drop:
+	kfree_skb(skb);
+	if (dev)
+		dev_put(dev);
+	return err;
+}
+EXPORT_SYMBOL(pn_skb_send);
+
+/* Do not send an error message in response to an error message */
+static inline int can_respond(struct sk_buff *skb)
+{
+	const struct phonethdr *ph;
+	const struct phonetmsg *pm;
+	u8 submsg_id;
+
+	if (!pskb_may_pull(skb, 3))
+		return 0;
+
+	ph = pn_hdr(skb);
+	if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
+		return 0;
+	if (ph->pn_res == PN_COMMGR) /* indications */
+		return 0;
+
+	ph = pn_hdr(skb); /* re-acquires the pointer */
+	pm = pn_msg(skb);
+	if (pm->pn_msg_id != PN_COMMON_MESSAGE)
+		return 1;
+	submsg_id = (ph->pn_res == PN_PREFIX)
+		? pm->pn_e_submsg_id : pm->pn_submsg_id;
+	if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP &&
+		pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP)
+		return 1;
+	return 0;
+}
+
+static int send_obj_unreachable(struct sk_buff *rskb)
+{
+	const struct phonethdr *oph = pn_hdr(rskb);
+	const struct phonetmsg *opm = pn_msg(rskb);
+	struct phonetmsg resp;
+
+	memset(&resp, 0, sizeof(resp));
+	resp.pn_trans_id = opm->pn_trans_id;
+	resp.pn_msg_id = PN_COMMON_MESSAGE;
+	if (oph->pn_res == PN_PREFIX) {
+		resp.pn_e_res_id = opm->pn_e_res_id;
+		resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
+		resp.pn_e_orig_msg_id = opm->pn_msg_id;
+		resp.pn_e_status = 0;
+	} else {
+		resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
+		resp.pn_orig_msg_id = opm->pn_msg_id;
+		resp.pn_status = 0;
+	}
+	return pn_raw_send(&resp, sizeof(resp), rskb->dev,
+				pn_object(oph->pn_sdev, oph->pn_sobj),
+				pn_object(oph->pn_rdev, oph->pn_robj),
+				oph->pn_res);
+}
+
+static int send_reset_indications(struct sk_buff *rskb)
+{
+	struct phonethdr *oph = pn_hdr(rskb);
+	static const u8 data[4] = {
+		0x00 /* trans ID */, 0x10 /* subscribe msg */,
+		0x00 /* subscription count */, 0x00 /* dummy */
+	};
+
+	return pn_raw_send(data, sizeof(data), rskb->dev,
+				pn_object(oph->pn_sdev, 0x00),
+				pn_object(oph->pn_rdev, oph->pn_robj),
+				PN_COMMGR);
+}
+
+
+/* packet type functions */
+
+/*
+ * Stuff received packets to associated sockets.
+ * On error, returns non-zero and releases the skb.
+ */
+static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
+			struct packet_type *pkttype,
+			struct net_device *orig_dev)
+{
+	struct net *net = dev_net(dev);
+	struct phonethdr *ph;
+	struct sockaddr_pn sa;
+	u16 len;
+
+	/* check we have at least a full Phonet header */
+	if (!pskb_pull(skb, sizeof(struct phonethdr)))
+		goto out;
+
+	/* check that the advertised length is correct */
+	ph = pn_hdr(skb);
+	len = get_unaligned_be16(&ph->pn_length);
+	if (len < 2)
+		goto out;
+	len -= 2;
+	if ((len > skb->len) || pskb_trim(skb, len))
+		goto out;
+	skb_reset_transport_header(skb);
+
+	pn_skb_get_dst_sockaddr(skb, &sa);
+
+	/* check if this is broadcasted */
+	if (pn_sockaddr_get_addr(&sa) == PNADDR_BROADCAST) {
+		pn_deliver_sock_broadcast(net, skb);
+		goto out;
+	}
+
+	/* resource routing */
+	if (pn_sockaddr_get_object(&sa) == 0) {
+		struct sock *sk = pn_find_sock_by_res(net, sa.spn_resource);
+		if (sk)
+			return sk_receive_skb(sk, skb, 0);
+	}
+
+	/* check if we are the destination */
+	if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
+		/* Phonet packet input */
+		struct sock *sk = pn_find_sock_by_sa(net, &sa);
+
+		if (sk)
+			return sk_receive_skb(sk, skb, 0);
+
+		if (can_respond(skb)) {
+			send_obj_unreachable(skb);
+			send_reset_indications(skb);
+		}
+	} else if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+		goto out; /* Race between address deletion and loopback */
+	else {
+		/* Phonet packet routing */
+		struct net_device *out_dev;
+
+		out_dev = phonet_route_output(net, pn_sockaddr_get_addr(&sa));
+		if (!out_dev) {
+			LIMIT_NETDEBUG(KERN_WARNING"No Phonet route to %02X\n",
+					pn_sockaddr_get_addr(&sa));
+			goto out;
+		}
+
+		__skb_push(skb, sizeof(struct phonethdr));
+		skb->dev = out_dev;
+		if (out_dev == dev) {
+			LIMIT_NETDEBUG(KERN_ERR"Phonet loop to %02X on %s\n",
+					pn_sockaddr_get_addr(&sa), dev->name);
+			goto out_dev;
+		}
+		/* Some drivers (e.g. TUN) do not allocate HW header space */
+		if (skb_cow_head(skb, out_dev->hard_header_len))
+			goto out_dev;
+
+		if (dev_hard_header(skb, out_dev, ETH_P_PHONET, NULL, NULL,
+					skb->len) < 0)
+			goto out_dev;
+		dev_queue_xmit(skb);
+		dev_put(out_dev);
+		return NET_RX_SUCCESS;
+out_dev:
+		dev_put(out_dev);
+	}
+
+out:
+	kfree_skb(skb);
+	return NET_RX_DROP;
+}
+
+static struct packet_type phonet_packet_type __read_mostly = {
+	.type = cpu_to_be16(ETH_P_PHONET),
+	.func = phonet_rcv,
+};
+
+static DEFINE_MUTEX(proto_tab_lock);
+
+int __init_or_module phonet_proto_register(unsigned int protocol,
+						struct phonet_protocol *pp)
+{
+	int err = 0;
+
+	if (protocol >= PHONET_NPROTO)
+		return -EINVAL;
+
+	err = proto_register(pp->prot, 1);
+	if (err)
+		return err;
+
+	mutex_lock(&proto_tab_lock);
+	if (proto_tab[protocol])
+		err = -EBUSY;
+	else
+		rcu_assign_pointer(proto_tab[protocol], pp);
+	mutex_unlock(&proto_tab_lock);
+
+	return err;
+}
+EXPORT_SYMBOL(phonet_proto_register);
+
+void phonet_proto_unregister(unsigned int protocol, struct phonet_protocol *pp)
+{
+	mutex_lock(&proto_tab_lock);
+	BUG_ON(proto_tab[protocol] != pp);
+	RCU_INIT_POINTER(proto_tab[protocol], NULL);
+	mutex_unlock(&proto_tab_lock);
+	synchronize_rcu();
+	proto_unregister(pp->prot);
+}
+EXPORT_SYMBOL(phonet_proto_unregister);
+
+/* Module registration */
+static int __init phonet_init(void)
+{
+	int err;
+
+	err = phonet_device_init();
+	if (err)
+		return err;
+
+	pn_sock_init();
+	err = sock_register(&phonet_proto_family);
+	if (err) {
+		printk(KERN_ALERT
+			"phonet protocol family initialization failed\n");
+		goto err_sock;
+	}
+
+	dev_add_pack(&phonet_packet_type);
+	phonet_sysctl_init();
+
+	err = isi_register();
+	if (err)
+		goto err;
+	return 0;
+
+err:
+	phonet_sysctl_exit();
+	sock_unregister(PF_PHONET);
+	dev_remove_pack(&phonet_packet_type);
+err_sock:
+	phonet_device_exit();
+	return err;
+}
+
+static void __exit phonet_exit(void)
+{
+	isi_unregister();
+	phonet_sysctl_exit();
+	sock_unregister(PF_PHONET);
+	dev_remove_pack(&phonet_packet_type);
+	phonet_device_exit();
+}
+
+module_init(phonet_init);
+module_exit(phonet_exit);
+MODULE_DESCRIPTION("Phonet protocol stack for Linux");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_PHONET);

net/phonet/datagram.c

@@ -0,0 +1,214 @@
+/*
+ * File: datagram.c
+ *
+ * Datagram (ISI) Phonet sockets
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Authors: Sakari Ailus <sakari.ailus@nokia.com>
+ *          Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <asm/ioctls.h>
+#include <net/sock.h>
+
+#include <linux/phonet.h>
+#include <linux/export.h>
+#include <net/phonet/phonet.h>
+
+static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+
+/* associated socket ceases to exist */
+static void pn_sock_close(struct sock *sk, long timeout)
+{
+	sk_common_release(sk);
+}
+
+static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+	struct sk_buff *skb;
+	int answ;
+
+	switch (cmd) {
+	case SIOCINQ:
+		lock_sock(sk);
+		skb = skb_peek(&sk->sk_receive_queue);
+		answ = skb ? skb->len : 0;
+		release_sock(sk);
+		return put_user(answ, (int __user *)arg);
+
+	case SIOCPNADDRESOURCE:
+	case SIOCPNDELRESOURCE: {
+			u32 res;
+			if (get_user(res, (u32 __user *)arg))
+				return -EFAULT;
+			if (res >= 256)
+				return -EINVAL;
+			if (cmd == SIOCPNADDRESOURCE)
+				return pn_sock_bind_res(sk, res);
+			else
+				return pn_sock_unbind_res(sk, res);
+		}
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+/* Destroy socket. All references are gone. */
+static void pn_destruct(struct sock *sk)
+{
+	skb_queue_purge(&sk->sk_receive_queue);
+}
+
+static int pn_init(struct sock *sk)
+{
+	sk->sk_destruct = pn_destruct;
+	return 0;
+}
+
+static int pn_sendmsg(struct kiocb *iocb, struct sock *sk,
+			struct msghdr *msg, size_t len)
+{
+	DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name);
+	struct sk_buff *skb;
+	int err;
+
+	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
+				MSG_CMSG_COMPAT))
+		return -EOPNOTSUPP;
+
+	if (target == NULL)
+		return -EDESTADDRREQ;
+
+	if (msg->msg_namelen < sizeof(struct sockaddr_pn))
+		return -EINVAL;
+
+	if (target->spn_family != AF_PHONET)
+		return -EAFNOSUPPORT;
+
+	skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len,
+					msg->msg_flags & MSG_DONTWAIT, &err);
+	if (skb == NULL)
+		return err;
+	skb_reserve(skb, MAX_PHONET_HEADER);
+
+	err = memcpy_fromiovec((void *)skb_put(skb, len), msg->msg_iov, len);
+	if (err < 0) {
+		kfree_skb(skb);
+		return err;
+	}
+
+	/*
+	 * Fill in the Phonet header and
+	 * finally pass the packet forwards.
+	 */
+	err = pn_skb_send(sk, skb, target);
+
+	/* If ok, return len. */
+	return (err >= 0) ? len : err;
+}
+
+static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
+			struct msghdr *msg, size_t len, int noblock,
+			int flags, int *addr_len)
+{
+	struct sk_buff *skb = NULL;
+	struct sockaddr_pn sa;
+	int rval = -EOPNOTSUPP;
+	int copylen;
+
+	if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL|
+			MSG_CMSG_COMPAT))
+		goto out_nofree;
+
+	skb = skb_recv_datagram(sk, flags, noblock, &rval);
+	if (skb == NULL)
+		goto out_nofree;
+
+	pn_skb_get_src_sockaddr(skb, &sa);
+
+	copylen = skb->len;
+	if (len < copylen) {
+		msg->msg_flags |= MSG_TRUNC;
+		copylen = len;
+	}
+
+	rval = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copylen);
+	if (rval) {
+		rval = -EFAULT;
+		goto out;
+	}
+
+	rval = (flags & MSG_TRUNC) ? skb->len : copylen;
+
+	if (msg->msg_name != NULL) {
+		__sockaddr_check_size(sizeof(sa));
+		memcpy(msg->msg_name, &sa, sizeof(sa));
+		*addr_len = sizeof(sa);
+	}
+
+out:
+	skb_free_datagram(sk, skb);
+
+out_nofree:
+	return rval;
+}
+
+/* Queue an skb for a sock. */
+static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	int err = sock_queue_rcv_skb(sk, skb);
+
+	if (err < 0)
+		kfree_skb(skb);
+	return err ? NET_RX_DROP : NET_RX_SUCCESS;
+}
+
+/* Module registration */
+static struct proto pn_proto = {
+	.close		= pn_sock_close,
+	.ioctl		= pn_ioctl,
+	.init		= pn_init,
+	.sendmsg	= pn_sendmsg,
+	.recvmsg	= pn_recvmsg,
+	.backlog_rcv	= pn_backlog_rcv,
+	.hash		= pn_sock_hash,
+	.unhash		= pn_sock_unhash,
+	.get_port	= pn_sock_get_port,
+	.obj_size	= sizeof(struct pn_sock),
+	.owner		= THIS_MODULE,
+	.name		= "PHONET",
+};
+
+static struct phonet_protocol pn_dgram_proto = {
+	.ops		= &phonet_dgram_ops,
+	.prot		= &pn_proto,
+	.sock_type	= SOCK_DGRAM,
+};
+
+int __init isi_register(void)
+{
+	return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto);
+}
+
+void __exit isi_unregister(void)
+{
+	phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto);
+}

net/phonet/pep-gprs.c

@@ -0,0 +1,328 @@
+/*
+ * File: pep-gprs.c
+ *
+ * GPRS over Phonet pipe end point socket
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <net/sock.h>
+
+#include <linux/if_phonet.h>
+#include <net/tcp_states.h>
+#include <net/phonet/gprs.h>
+
+#define GPRS_DEFAULT_MTU 1400
+
+struct gprs_dev {
+	struct sock		*sk;
+	void			(*old_state_change)(struct sock *);
+	void			(*old_data_ready)(struct sock *);
+	void			(*old_write_space)(struct sock *);
+
+	struct net_device	*dev;
+};
+
+static __be16 gprs_type_trans(struct sk_buff *skb)
+{
+	const u8 *pvfc;
+	u8 buf;
+
+	pvfc = skb_header_pointer(skb, 0, 1, &buf);
+	if (!pvfc)
+		return htons(0);
+	/* Look at IP version field */
+	switch (*pvfc >> 4) {
+	case 4:
+		return htons(ETH_P_IP);
+	case 6:
+		return htons(ETH_P_IPV6);
+	}
+	return htons(0);
+}
+
+static void gprs_writeable(struct gprs_dev *gp)
+{
+	struct net_device *dev = gp->dev;
+
+	if (pep_writeable(gp->sk))
+		netif_wake_queue(dev);
+}
+
+/*
+ * Socket callbacks
+ */
+
+static void gprs_state_change(struct sock *sk)
+{
+	struct gprs_dev *gp = sk->sk_user_data;
+
+	if (sk->sk_state == TCP_CLOSE_WAIT) {
+		struct net_device *dev = gp->dev;
+
+		netif_stop_queue(dev);
+		netif_carrier_off(dev);
+	}
+}
+
+static int gprs_recv(struct gprs_dev *gp, struct sk_buff *skb)
+{
+	struct net_device *dev = gp->dev;
+	int err = 0;
+	__be16 protocol = gprs_type_trans(skb);
+
+	if (!protocol) {
+		err = -EINVAL;
+		goto drop;
+	}
+
+	if (skb_headroom(skb) & 3) {
+		struct sk_buff *rskb, *fs;
+		int flen = 0;
+
+		/* Phonet Pipe data header may be misaligned (3 bytes),
+		 * so wrap the IP packet as a single fragment of an head-less
+		 * socket buffer. The network stack will pull what it needs,
+		 * but at least, the whole IP payload is not memcpy'd. */
+		rskb = netdev_alloc_skb(dev, 0);
+		if (!rskb) {
+			err = -ENOBUFS;
+			goto drop;
+		}
+		skb_shinfo(rskb)->frag_list = skb;
+		rskb->len += skb->len;
+		rskb->data_len += rskb->len;
+		rskb->truesize += rskb->len;
+
+		/* Avoid nested fragments */
+		skb_walk_frags(skb, fs)
+			flen += fs->len;
+		skb->next = skb_shinfo(skb)->frag_list;
+		skb_frag_list_init(skb);
+		skb->len -= flen;
+		skb->data_len -= flen;
+		skb->truesize -= flen;
+
+		skb = rskb;
+	}
+
+	skb->protocol = protocol;
+	skb_reset_mac_header(skb);
+	skb->dev = dev;
+
+	if (likely(dev->flags & IFF_UP)) {
+		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += skb->len;
+		netif_rx(skb);
+		skb = NULL;
+	} else
+		err = -ENODEV;
+
+drop:
+	if (skb) {
+		dev_kfree_skb(skb);
+		dev->stats.rx_dropped++;
+	}
+	return err;
+}
+
+static void gprs_data_ready(struct sock *sk)
+{
+	struct gprs_dev *gp = sk->sk_user_data;
+	struct sk_buff *skb;
+
+	while ((skb = pep_read(sk)) != NULL) {
+		skb_orphan(skb);
+		gprs_recv(gp, skb);
+	}
+}
+
+static void gprs_write_space(struct sock *sk)
+{
+	struct gprs_dev *gp = sk->sk_user_data;
+
+	if (netif_running(gp->dev))
+		gprs_writeable(gp);
+}
+
+/*
+ * Network device callbacks
+ */
+
+static int gprs_open(struct net_device *dev)
+{
+	struct gprs_dev *gp = netdev_priv(dev);
+
+	gprs_writeable(gp);
+	return 0;
+}
+
+static int gprs_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static netdev_tx_t gprs_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct gprs_dev *gp = netdev_priv(dev);
+	struct sock *sk = gp->sk;
+	int len, err;
+
+	switch (skb->protocol) {
+	case  htons(ETH_P_IP):
+	case  htons(ETH_P_IPV6):
+		break;
+	default:
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	skb_orphan(skb);
+	skb_set_owner_w(skb, sk);
+	len = skb->len;
+	err = pep_write(sk, skb);
+	if (err) {
+		LIMIT_NETDEBUG(KERN_WARNING"%s: TX error (%d)\n",
+				dev->name, err);
+		dev->stats.tx_aborted_errors++;
+		dev->stats.tx_errors++;
+	} else {
+		dev->stats.tx_packets++;
+		dev->stats.tx_bytes += len;
+	}
+
+	netif_stop_queue(dev);
+	if (pep_writeable(sk))
+		netif_wake_queue(dev);
+	return NETDEV_TX_OK;
+}
+
+static int gprs_set_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 576) || (new_mtu > (PHONET_MAX_MTU - 11)))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static const struct net_device_ops gprs_netdev_ops = {
+	.ndo_open	= gprs_open,
+	.ndo_stop	= gprs_close,
+	.ndo_start_xmit	= gprs_xmit,
+	.ndo_change_mtu	= gprs_set_mtu,
+};
+
+static void gprs_setup(struct net_device *dev)
+{
+	dev->features		= NETIF_F_FRAGLIST;
+	dev->type		= ARPHRD_PHONET_PIPE;
+	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
+	dev->mtu		= GPRS_DEFAULT_MTU;
+	dev->hard_header_len	= 0;
+	dev->addr_len		= 0;
+	dev->tx_queue_len	= 10;
+
+	dev->netdev_ops		= &gprs_netdev_ops;
+	dev->destructor		= free_netdev;
+}
+
+/*
+ * External interface
+ */
+
+/*
+ * Attach a GPRS interface to a datagram socket.
+ * Returns the interface index on success, negative error code on error.
+ */
+int gprs_attach(struct sock *sk)
+{
+	static const char ifname[] = "gprs%d";
+	struct gprs_dev *gp;
+	struct net_device *dev;
+	int err;
+
+	if (unlikely(sk->sk_type == SOCK_STREAM))
+		return -EINVAL; /* need packet boundaries */
+
+	/* Create net device */
+	dev = alloc_netdev(sizeof(*gp), ifname, NET_NAME_UNKNOWN, gprs_setup);
+	if (!dev)
+		return -ENOMEM;
+	gp = netdev_priv(dev);
+	gp->sk = sk;
+	gp->dev = dev;
+
+	netif_stop_queue(dev);
+	err = register_netdev(dev);
+	if (err) {
+		free_netdev(dev);
+		return err;
+	}
+
+	lock_sock(sk);
+	if (unlikely(sk->sk_user_data)) {
+		err = -EBUSY;
+		goto out_rel;
+	}
+	if (unlikely((1 << sk->sk_state & (TCPF_CLOSE|TCPF_LISTEN)) ||
+			sock_flag(sk, SOCK_DEAD))) {
+		err = -EINVAL;
+		goto out_rel;
+	}
+	sk->sk_user_data	= gp;
+	gp->old_state_change	= sk->sk_state_change;
+	gp->old_data_ready	= sk->sk_data_ready;
+	gp->old_write_space	= sk->sk_write_space;
+	sk->sk_state_change	= gprs_state_change;
+	sk->sk_data_ready	= gprs_data_ready;
+	sk->sk_write_space	= gprs_write_space;
+	release_sock(sk);
+	sock_hold(sk);
+
+	printk(KERN_DEBUG"%s: attached\n", dev->name);
+	return dev->ifindex;
+
+out_rel:
+	release_sock(sk);
+	unregister_netdev(dev);
+	return err;
+}
+
+void gprs_detach(struct sock *sk)
+{
+	struct gprs_dev *gp = sk->sk_user_data;
+	struct net_device *dev = gp->dev;
+
+	lock_sock(sk);
+	sk->sk_user_data	= NULL;
+	sk->sk_state_change	= gp->old_state_change;
+	sk->sk_data_ready	= gp->old_data_ready;
+	sk->sk_write_space	= gp->old_write_space;
+	release_sock(sk);
+
+	printk(KERN_DEBUG"%s: detached\n", dev->name);
+	unregister_netdev(dev);
+	sock_put(sk);
+}

net/phonet/pn_dev.c

@@ -0,0 +1,431 @@
+/*
+ * File: pn_dev.c
+ *
+ * Phonet network device
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Authors: Sakari Ailus <sakari.ailus@nokia.com>
+ *          Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/phonet.h>
+#include <linux/proc_fs.h>
+#include <linux/if_arp.h>
+#include <net/sock.h>
+#include <net/netns/generic.h>
+#include <net/phonet/pn_dev.h>
+
+struct phonet_routes {
+	struct mutex		lock;
+	struct net_device __rcu	*table[64];
+};
+
+struct phonet_net {
+	struct phonet_device_list pndevs;
+	struct phonet_routes routes;
+};
+
+static int phonet_net_id __read_mostly;
+
+static struct phonet_net *phonet_pernet(struct net *net)
+{
+	BUG_ON(!net);
+
+	return net_generic(net, phonet_net_id);
+}
+
+struct phonet_device_list *phonet_device_list(struct net *net)
+{
+	struct phonet_net *pnn = phonet_pernet(net);
+	return &pnn->pndevs;
+}
+
+/* Allocate new Phonet device. */
+static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
+	if (pnd == NULL)
+		return NULL;
+	pnd->netdev = dev;
+	bitmap_zero(pnd->addrs, 64);
+
+	BUG_ON(!mutex_is_locked(&pndevs->lock));
+	list_add_rcu(&pnd->list, &pndevs->list);
+	return pnd;
+}
+
+static struct phonet_device *__phonet_get(struct net_device *dev)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+
+	BUG_ON(!mutex_is_locked(&pndevs->lock));
+	list_for_each_entry(pnd, &pndevs->list, list) {
+		if (pnd->netdev == dev)
+			return pnd;
+	}
+	return NULL;
+}
+
+static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
+		if (pnd->netdev == dev)
+			return pnd;
+	}
+	return NULL;
+}
+
+static void phonet_device_destroy(struct net_device *dev)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+
+	ASSERT_RTNL();
+
+	mutex_lock(&pndevs->lock);
+	pnd = __phonet_get(dev);
+	if (pnd)
+		list_del_rcu(&pnd->list);
+	mutex_unlock(&pndevs->lock);
+
+	if (pnd) {
+		u8 addr;
+
+		for_each_set_bit(addr, pnd->addrs, 64)
+			phonet_address_notify(RTM_DELADDR, dev, addr);
+		kfree(pnd);
+	}
+}
+
+struct net_device *phonet_device_get(struct net *net)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(net);
+	struct phonet_device *pnd;
+	struct net_device *dev = NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
+		dev = pnd->netdev;
+		BUG_ON(!dev);
+
+		if ((dev->reg_state == NETREG_REGISTERED) &&
+			((pnd->netdev->flags & IFF_UP)) == IFF_UP)
+			break;
+		dev = NULL;
+	}
+	if (dev)
+		dev_hold(dev);
+	rcu_read_unlock();
+	return dev;
+}
+
+int phonet_address_add(struct net_device *dev, u8 addr)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+	int err = 0;
+
+	mutex_lock(&pndevs->lock);
+	/* Find or create Phonet-specific device data */
+	pnd = __phonet_get(dev);
+	if (pnd == NULL)
+		pnd = __phonet_device_alloc(dev);
+	if (unlikely(pnd == NULL))
+		err = -ENOMEM;
+	else if (test_and_set_bit(addr >> 2, pnd->addrs))
+		err = -EEXIST;
+	mutex_unlock(&pndevs->lock);
+	return err;
+}
+
+int phonet_address_del(struct net_device *dev, u8 addr)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+	int err = 0;
+
+	mutex_lock(&pndevs->lock);
+	pnd = __phonet_get(dev);
+	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
+		err = -EADDRNOTAVAIL;
+		pnd = NULL;
+	} else if (bitmap_empty(pnd->addrs, 64))
+		list_del_rcu(&pnd->list);
+	else
+		pnd = NULL;
+	mutex_unlock(&pndevs->lock);
+
+	if (pnd)
+		kfree_rcu(pnd, rcu);
+
+	return err;
+}
+
+/* Gets a source address toward a destination, through a interface. */
+u8 phonet_address_get(struct net_device *dev, u8 daddr)
+{
+	struct phonet_device *pnd;
+	u8 saddr;
+
+	rcu_read_lock();
+	pnd = __phonet_get_rcu(dev);
+	if (pnd) {
+		BUG_ON(bitmap_empty(pnd->addrs, 64));
+
+		/* Use same source address as destination, if possible */
+		if (test_bit(daddr >> 2, pnd->addrs))
+			saddr = daddr;
+		else
+			saddr = find_first_bit(pnd->addrs, 64) << 2;
+	} else
+		saddr = PN_NO_ADDR;
+	rcu_read_unlock();
+
+	if (saddr == PN_NO_ADDR) {
+		/* Fallback to another device */
+		struct net_device *def_dev;
+
+		def_dev = phonet_device_get(dev_net(dev));
+		if (def_dev) {
+			if (def_dev != dev)
+				saddr = phonet_address_get(def_dev, daddr);
+			dev_put(def_dev);
+		}
+	}
+	return saddr;
+}
+
+int phonet_address_lookup(struct net *net, u8 addr)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(net);
+	struct phonet_device *pnd;
+	int err = -EADDRNOTAVAIL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
+		/* Don't allow unregistering devices! */
+		if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
+				((pnd->netdev->flags & IFF_UP)) != IFF_UP)
+			continue;
+
+		if (test_bit(addr >> 2, pnd->addrs)) {
+			err = 0;
+			goto found;
+		}
+	}
+found:
+	rcu_read_unlock();
+	return err;
+}
+
+/* automatically configure a Phonet device, if supported */
+static int phonet_device_autoconf(struct net_device *dev)
+{
+	struct if_phonet_req req;
+	int ret;
+
+	if (!dev->netdev_ops->ndo_do_ioctl)
+		return -EOPNOTSUPP;
+
+	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
+						SIOCPNGAUTOCONF);
+	if (ret < 0)
+		return ret;
+
+	ASSERT_RTNL();
+	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
+	if (ret)
+		return ret;
+	phonet_address_notify(RTM_NEWADDR, dev,
+				req.ifr_phonet_autoconf.device);
+	return 0;
+}
+
+static void phonet_route_autodel(struct net_device *dev)
+{
+	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
+	unsigned int i;
+	DECLARE_BITMAP(deleted, 64);
+
+	/* Remove left-over Phonet routes */
+	bitmap_zero(deleted, 64);
+	mutex_lock(&pnn->routes.lock);
+	for (i = 0; i < 64; i++)
+		if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
+			RCU_INIT_POINTER(pnn->routes.table[i], NULL);
+			set_bit(i, deleted);
+		}
+	mutex_unlock(&pnn->routes.lock);
+
+	if (bitmap_empty(deleted, 64))
+		return; /* short-circuit RCU */
+	synchronize_rcu();
+	for_each_set_bit(i, deleted, 64) {
+		rtm_phonet_notify(RTM_DELROUTE, dev, i);
+		dev_put(dev);
+	}
+}
+
+/* notify Phonet of device events */
+static int phonet_device_notify(struct notifier_block *me, unsigned long what,
+				void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+	switch (what) {
+	case NETDEV_REGISTER:
+		if (dev->type == ARPHRD_PHONET)
+			phonet_device_autoconf(dev);
+		break;
+	case NETDEV_UNREGISTER:
+		phonet_device_destroy(dev);
+		phonet_route_autodel(dev);
+		break;
+	}
+	return 0;
+
+}
+
+static struct notifier_block phonet_device_notifier = {
+	.notifier_call = phonet_device_notify,
+	.priority = 0,
+};
+
+/* Per-namespace Phonet devices handling */
+static int __net_init phonet_init_net(struct net *net)
+{
+	struct phonet_net *pnn = phonet_pernet(net);
+
+	if (!proc_create("phonet", 0, net->proc_net, &pn_sock_seq_fops))
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&pnn->pndevs.list);
+	mutex_init(&pnn->pndevs.lock);
+	mutex_init(&pnn->routes.lock);
+	return 0;
+}
+
+static void __net_exit phonet_exit_net(struct net *net)
+{
+	remove_proc_entry("phonet", net->proc_net);
+}
+
+static struct pernet_operations phonet_net_ops = {
+	.init = phonet_init_net,
+	.exit = phonet_exit_net,
+	.id   = &phonet_net_id,
+	.size = sizeof(struct phonet_net),
+};
+
+/* Initialize Phonet devices list */
+int __init phonet_device_init(void)
+{
+	int err = register_pernet_subsys(&phonet_net_ops);
+	if (err)
+		return err;
+
+	proc_create("pnresource", 0, init_net.proc_net, &pn_res_seq_fops);
+	register_netdevice_notifier(&phonet_device_notifier);
+	err = phonet_netlink_register();
+	if (err)
+		phonet_device_exit();
+	return err;
+}
+
+void phonet_device_exit(void)
+{
+	rtnl_unregister_all(PF_PHONET);
+	unregister_netdevice_notifier(&phonet_device_notifier);
+	unregister_pernet_subsys(&phonet_net_ops);
+	remove_proc_entry("pnresource", init_net.proc_net);
+}
+
+int phonet_route_add(struct net_device *dev, u8 daddr)
+{
+	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
+	struct phonet_routes *routes = &pnn->routes;
+	int err = -EEXIST;
+
+	daddr = daddr >> 2;
+	mutex_lock(&routes->lock);
+	if (routes->table[daddr] == NULL) {
+		rcu_assign_pointer(routes->table[daddr], dev);
+		dev_hold(dev);
+		err = 0;
+	}
+	mutex_unlock(&routes->lock);
+	return err;
+}
+
+int phonet_route_del(struct net_device *dev, u8 daddr)
+{
+	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
+	struct phonet_routes *routes = &pnn->routes;
+
+	daddr = daddr >> 2;
+	mutex_lock(&routes->lock);
+	if (rcu_access_pointer(routes->table[daddr]) == dev)
+		RCU_INIT_POINTER(routes->table[daddr], NULL);
+	else
+		dev = NULL;
+	mutex_unlock(&routes->lock);
+
+	if (!dev)
+		return -ENOENT;
+	synchronize_rcu();
+	dev_put(dev);
+	return 0;
+}
+
+struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
+{
+	struct phonet_net *pnn = phonet_pernet(net);
+	struct phonet_routes *routes = &pnn->routes;
+	struct net_device *dev;
+
+	daddr >>= 2;
+	dev = rcu_dereference(routes->table[daddr]);
+	return dev;
+}
+
+struct net_device *phonet_route_output(struct net *net, u8 daddr)
+{
+	struct phonet_net *pnn = phonet_pernet(net);
+	struct phonet_routes *routes = &pnn->routes;
+	struct net_device *dev;
+
+	daddr >>= 2;
+	rcu_read_lock();
+	dev = rcu_dereference(routes->table[daddr]);
+	if (dev)
+		dev_hold(dev);
+	rcu_read_unlock();
+
+	if (!dev)
+		dev = phonet_device_get(net); /* Default route */
+	return dev;
+}

net/phonet/pn_netlink.c

@@ -0,0 +1,312 @@
+/*
+ * File: pn_netlink.c
+ *
+ * Phonet netlink interface
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Authors: Sakari Ailus <sakari.ailus@nokia.com>
+ *          Remi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/phonet.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/phonet/pn_dev.h>
+
+/* Device address handling */
+
+static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
+		     u32 portid, u32 seq, int event);
+
+void phonet_address_notify(int event, struct net_device *dev, u8 addr)
+{
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+			nla_total_size(1), GFP_KERNEL);
+	if (skb == NULL)
+		goto errout;
+	err = fill_addr(skb, dev, addr, 0, 0, event);
+	if (err < 0) {
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, dev_net(dev), 0,
+		    RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
+	return;
+errout:
+	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
+}
+
+static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
+	[IFA_LOCAL] = { .type = NLA_U8 },
+};
+
+static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tb[IFA_MAX+1];
+	struct net_device *dev;
+	struct ifaddrmsg *ifm;
+	int err;
+	u8 pnaddr;
+
+	if (!netlink_capable(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (!netlink_capable(skb, CAP_SYS_ADMIN))
+		return -EPERM;
+
+	ASSERT_RTNL();
+
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
+	if (err < 0)
+		return err;
+
+	ifm = nlmsg_data(nlh);
+	if (tb[IFA_LOCAL] == NULL)
+		return -EINVAL;
+	pnaddr = nla_get_u8(tb[IFA_LOCAL]);
+	if (pnaddr & 3)
+		/* Phonet addresses only have 6 high-order bits */
+		return -EINVAL;
+
+	dev = __dev_get_by_index(net, ifm->ifa_index);
+	if (dev == NULL)
+		return -ENODEV;
+
+	if (nlh->nlmsg_type == RTM_NEWADDR)
+		err = phonet_address_add(dev, pnaddr);
+	else
+		err = phonet_address_del(dev, pnaddr);
+	if (!err)
+		phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
+	return err;
+}
+
+static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
+			u32 portid, u32 seq, int event)
+{
+	struct ifaddrmsg *ifm;
+	struct nlmsghdr *nlh;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	ifm = nlmsg_data(nlh);
+	ifm->ifa_family = AF_PHONET;
+	ifm->ifa_prefixlen = 0;
+	ifm->ifa_flags = IFA_F_PERMANENT;
+	ifm->ifa_scope = RT_SCOPE_LINK;
+	ifm->ifa_index = dev->ifindex;
+	if (nla_put_u8(skb, IFA_LOCAL, addr))
+		goto nla_put_failure;
+	return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct phonet_device_list *pndevs;
+	struct phonet_device *pnd;
+	int dev_idx = 0, dev_start_idx = cb->args[0];
+	int addr_idx = 0, addr_start_idx = cb->args[1];
+
+	pndevs = phonet_device_list(sock_net(skb->sk));
+	rcu_read_lock();
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
+		u8 addr;
+
+		if (dev_idx > dev_start_idx)
+			addr_start_idx = 0;
+		if (dev_idx++ < dev_start_idx)
+			continue;
+
+		addr_idx = 0;
+		for_each_set_bit(addr, pnd->addrs, 64) {
+			if (addr_idx++ < addr_start_idx)
+				continue;
+
+			if (fill_addr(skb, pnd->netdev, addr << 2,
+					 NETLINK_CB(cb->skb).portid,
+					cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
+				goto out;
+		}
+	}
+
+out:
+	rcu_read_unlock();
+	cb->args[0] = dev_idx;
+	cb->args[1] = addr_idx;
+
+	return skb->len;
+}
+
+/* Routes handling */
+
+static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
+			u32 portid, u32 seq, int event)
+{
+	struct rtmsg *rtm;
+	struct nlmsghdr *nlh;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	rtm = nlmsg_data(nlh);
+	rtm->rtm_family = AF_PHONET;
+	rtm->rtm_dst_len = 6;
+	rtm->rtm_src_len = 0;
+	rtm->rtm_tos = 0;
+	rtm->rtm_table = RT_TABLE_MAIN;
+	rtm->rtm_protocol = RTPROT_STATIC;
+	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+	rtm->rtm_type = RTN_UNICAST;
+	rtm->rtm_flags = 0;
+	if (nla_put_u8(skb, RTA_DST, dst) ||
+	    nla_put_u32(skb, RTA_OIF, dev->ifindex))
+		goto nla_put_failure;
+	return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
+{
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+			nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
+	if (skb == NULL)
+		goto errout;
+	err = fill_route(skb, dev, dst, 0, 0, event);
+	if (err < 0) {
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, dev_net(dev), 0,
+			  RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
+	return;
+errout:
+	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
+}
+
+static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
+	[RTA_DST] = { .type = NLA_U8 },
+	[RTA_OIF] = { .type = NLA_U32 },
+};
+
+static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tb[RTA_MAX+1];
+	struct net_device *dev;
+	struct rtmsg *rtm;
+	int err;
+	u8 dst;
+
+	if (!netlink_capable(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (!netlink_capable(skb, CAP_SYS_ADMIN))
+		return -EPERM;
+
+	ASSERT_RTNL();
+
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
+	if (err < 0)
+		return err;
+
+	rtm = nlmsg_data(nlh);
+	if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
+		return -EINVAL;
+	if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
+		return -EINVAL;
+	dst = nla_get_u8(tb[RTA_DST]);
+	if (dst & 3) /* Phonet addresses only have 6 high-order bits */
+		return -EINVAL;
+
+	dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
+	if (dev == NULL)
+		return -ENODEV;
+
+	if (nlh->nlmsg_type == RTM_NEWROUTE)
+		err = phonet_route_add(dev, dst);
+	else
+		err = phonet_route_del(dev, dst);
+	if (!err)
+		rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
+	return err;
+}
+
+static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
+
+	rcu_read_lock();
+	for (addr = 0; addr < 64; addr++) {
+		struct net_device *dev;
+
+		dev = phonet_route_get_rcu(net, addr << 2);
+		if (!dev)
+			continue;
+
+		if (addr_idx++ < addr_start_idx)
+			continue;
+		if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
+				cb->nlh->nlmsg_seq, RTM_NEWROUTE))
+			goto out;
+	}
+
+out:
+	rcu_read_unlock();
+	cb->args[0] = addr_idx;
+	cb->args[1] = 0;
+
+	return skb->len;
+}
+
+int __init phonet_netlink_register(void)
+{
+	int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
+				  NULL, NULL);
+	if (err)
+		return err;
+
+	/* Further __rtnl_register() cannot fail */
+	__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
+	__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
+	__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
+	__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
+	__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
+	return 0;
+}

net/phonet/socket.c

@@ -0,0 +1,823 @@
+/*
+ * File: socket.c
+ *
+ * Phonet sockets
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Authors: Sakari Ailus <sakari.ailus@nokia.com>
+ *          Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/poll.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+
+#include <linux/phonet.h>
+#include <linux/export.h>
+#include <net/phonet/phonet.h>
+#include <net/phonet/pep.h>
+#include <net/phonet/pn_dev.h>
+
+static int pn_socket_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	if (sk) {
+		sock->sk = NULL;
+		sk->sk_prot->close(sk, 0);
+	}
+	return 0;
+}
+
+#define PN_HASHSIZE	16
+#define PN_HASHMASK	(PN_HASHSIZE-1)
+
+
+static struct  {
+	struct hlist_head hlist[PN_HASHSIZE];
+	struct mutex lock;
+} pnsocks;
+
+void __init pn_sock_init(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < PN_HASHSIZE; i++)
+		INIT_HLIST_HEAD(pnsocks.hlist + i);
+	mutex_init(&pnsocks.lock);
+}
+
+static struct hlist_head *pn_hash_list(u16 obj)
+{
+	return pnsocks.hlist + (obj & PN_HASHMASK);
+}
+
+/*
+ * Find address based on socket address, match only certain fields.
+ * Also grab sock if it was found. Remember to sock_put it later.
+ */
+struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
+{
+	struct sock *sknode;
+	struct sock *rval = NULL;
+	u16 obj = pn_sockaddr_get_object(spn);
+	u8 res = spn->spn_resource;
+	struct hlist_head *hlist = pn_hash_list(obj);
+
+	rcu_read_lock();
+	sk_for_each_rcu(sknode, hlist) {
+		struct pn_sock *pn = pn_sk(sknode);
+		BUG_ON(!pn->sobject); /* unbound socket */
+
+		if (!net_eq(sock_net(sknode), net))
+			continue;
+		if (pn_port(obj)) {
+			/* Look up socket by port */
+			if (pn_port(pn->sobject) != pn_port(obj))
+				continue;
+		} else {
+			/* If port is zero, look up by resource */
+			if (pn->resource != res)
+				continue;
+		}
+		if (pn_addr(pn->sobject) &&
+		    pn_addr(pn->sobject) != pn_addr(obj))
+			continue;
+
+		rval = sknode;
+		sock_hold(sknode);
+		break;
+	}
+	rcu_read_unlock();
+
+	return rval;
+}
+
+/* Deliver a broadcast packet (only in bottom-half) */
+void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
+{
+	struct hlist_head *hlist = pnsocks.hlist;
+	unsigned int h;
+
+	rcu_read_lock();
+	for (h = 0; h < PN_HASHSIZE; h++) {
+		struct sock *sknode;
+
+		sk_for_each(sknode, hlist) {
+			struct sk_buff *clone;
+
+			if (!net_eq(sock_net(sknode), net))
+				continue;
+			if (!sock_flag(sknode, SOCK_BROADCAST))
+				continue;
+
+			clone = skb_clone(skb, GFP_ATOMIC);
+			if (clone) {
+				sock_hold(sknode);
+				sk_receive_skb(sknode, clone, 0);
+			}
+		}
+		hlist++;
+	}
+	rcu_read_unlock();
+}
+
+void pn_sock_hash(struct sock *sk)
+{
+	struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
+
+	mutex_lock(&pnsocks.lock);
+	sk_add_node_rcu(sk, hlist);
+	mutex_unlock(&pnsocks.lock);
+}
+EXPORT_SYMBOL(pn_sock_hash);
+
+void pn_sock_unhash(struct sock *sk)
+{
+	mutex_lock(&pnsocks.lock);
+	sk_del_node_init_rcu(sk);
+	mutex_unlock(&pnsocks.lock);
+	pn_sock_unbind_all_res(sk);
+	synchronize_rcu();
+}
+EXPORT_SYMBOL(pn_sock_unhash);
+
+static DEFINE_MUTEX(port_mutex);
+
+static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
+{
+	struct sock *sk = sock->sk;
+	struct pn_sock *pn = pn_sk(sk);
+	struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
+	int err;
+	u16 handle;
+	u8 saddr;
+
+	if (sk->sk_prot->bind)
+		return sk->sk_prot->bind(sk, addr, len);
+
+	if (len < sizeof(struct sockaddr_pn))
+		return -EINVAL;
+	if (spn->spn_family != AF_PHONET)
+		return -EAFNOSUPPORT;
+
+	handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
+	saddr = pn_addr(handle);
+	if (saddr && phonet_address_lookup(sock_net(sk), saddr))
+		return -EADDRNOTAVAIL;
+
+	lock_sock(sk);
+	if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
+		err = -EINVAL; /* attempt to rebind */
+		goto out;
+	}
+	WARN_ON(sk_hashed(sk));
+	mutex_lock(&port_mutex);
+	err = sk->sk_prot->get_port(sk, pn_port(handle));
+	if (err)
+		goto out_port;
+
+	/* get_port() sets the port, bind() sets the address if applicable */
+	pn->sobject = pn_object(saddr, pn_port(pn->sobject));
+	pn->resource = spn->spn_resource;
+
+	/* Enable RX on the socket */
+	sk->sk_prot->hash(sk);
+out_port:
+	mutex_unlock(&port_mutex);
+out:
+	release_sock(sk);
+	return err;
+}
+
+static int pn_socket_autobind(struct socket *sock)
+{
+	struct sockaddr_pn sa;
+	int err;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.spn_family = AF_PHONET;
+	err = pn_socket_bind(sock, (struct sockaddr *)&sa,
+				sizeof(struct sockaddr_pn));
+	if (err != -EINVAL)
+		return err;
+	BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
+	return 0; /* socket was already bound */
+}
+
+static int pn_socket_connect(struct socket *sock, struct sockaddr *addr,
+		int len, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct pn_sock *pn = pn_sk(sk);
+	struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
+	struct task_struct *tsk = current;
+	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+	int err;
+
+	if (pn_socket_autobind(sock))
+		return -ENOBUFS;
+	if (len < sizeof(struct sockaddr_pn))
+		return -EINVAL;
+	if (spn->spn_family != AF_PHONET)
+		return -EAFNOSUPPORT;
+
+	lock_sock(sk);
+
+	switch (sock->state) {
+	case SS_UNCONNECTED:
+		if (sk->sk_state != TCP_CLOSE) {
+			err = -EISCONN;
+			goto out;
+		}
+		break;
+	case SS_CONNECTING:
+		err = -EALREADY;
+		goto out;
+	default:
+		err = -EISCONN;
+		goto out;
+	}
+
+	pn->dobject = pn_sockaddr_get_object(spn);
+	pn->resource = pn_sockaddr_get_resource(spn);
+	sock->state = SS_CONNECTING;
+
+	err = sk->sk_prot->connect(sk, addr, len);
+	if (err) {
+		sock->state = SS_UNCONNECTED;
+		pn->dobject = 0;
+		goto out;
+	}
+
+	while (sk->sk_state == TCP_SYN_SENT) {
+		DEFINE_WAIT(wait);
+
+		if (!timeo) {
+			err = -EINPROGRESS;
+			goto out;
+		}
+		if (signal_pending(tsk)) {
+			err = sock_intr_errno(timeo);
+			goto out;
+		}
+
+		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
+						TASK_INTERRUPTIBLE);
+		release_sock(sk);
+		timeo = schedule_timeout(timeo);
+		lock_sock(sk);
+		finish_wait(sk_sleep(sk), &wait);
+	}
+
+	if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
+		err = 0;
+	else if (sk->sk_state == TCP_CLOSE_WAIT)
+		err = -ECONNRESET;
+	else
+		err = -ECONNREFUSED;
+	sock->state = err ? SS_UNCONNECTED : SS_CONNECTED;
+out:
+	release_sock(sk);
+	return err;
+}
+
+static int pn_socket_accept(struct socket *sock, struct socket *newsock,
+				int flags)
+{
+	struct sock *sk = sock->sk;
+	struct sock *newsk;
+	int err;
+
+	if (unlikely(sk->sk_state != TCP_LISTEN))
+		return -EINVAL;
+
+	newsk = sk->sk_prot->accept(sk, flags, &err);
+	if (!newsk)
+		return err;
+
+	lock_sock(newsk);
+	sock_graft(newsk, newsock);
+	newsock->state = SS_CONNECTED;
+	release_sock(newsk);
+	return 0;
+}
+
+static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
+				int *sockaddr_len, int peer)
+{
+	struct sock *sk = sock->sk;
+	struct pn_sock *pn = pn_sk(sk);
+
+	memset(addr, 0, sizeof(struct sockaddr_pn));
+	addr->sa_family = AF_PHONET;
+	if (!peer) /* Race with bind() here is userland's problem. */
+		pn_sockaddr_set_object((struct sockaddr_pn *)addr,
+					pn->sobject);
+
+	*sockaddr_len = sizeof(struct sockaddr_pn);
+	return 0;
+}
+
+static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
+					poll_table *wait)
+{
+	struct sock *sk = sock->sk;
+	struct pep_sock *pn = pep_sk(sk);
+	unsigned int mask = 0;
+
+	poll_wait(file, sk_sleep(sk), wait);
+
+	if (sk->sk_state == TCP_CLOSE)
+		return POLLERR;
+	if (!skb_queue_empty(&sk->sk_receive_queue))
+		mask |= POLLIN | POLLRDNORM;
+	if (!skb_queue_empty(&pn->ctrlreq_queue))
+		mask |= POLLPRI;
+	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
+		return POLLHUP;
+
+	if (sk->sk_state == TCP_ESTABLISHED &&
+		atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
+		atomic_read(&pn->tx_credits))
+		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+
+	return mask;
+}
+
+static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
+				unsigned long arg)
+{
+	struct sock *sk = sock->sk;
+	struct pn_sock *pn = pn_sk(sk);
+
+	if (cmd == SIOCPNGETOBJECT) {
+		struct net_device *dev;
+		u16 handle;
+		u8 saddr;
+
+		if (get_user(handle, (__u16 __user *)arg))
+			return -EFAULT;
+
+		lock_sock(sk);
+		if (sk->sk_bound_dev_if)
+			dev = dev_get_by_index(sock_net(sk),
+						sk->sk_bound_dev_if);
+		else
+			dev = phonet_device_get(sock_net(sk));
+		if (dev && (dev->flags & IFF_UP))
+			saddr = phonet_address_get(dev, pn_addr(handle));
+		else
+			saddr = PN_NO_ADDR;
+		release_sock(sk);
+
+		if (dev)
+			dev_put(dev);
+		if (saddr == PN_NO_ADDR)
+			return -EHOSTUNREACH;
+
+		handle = pn_object(saddr, pn_port(pn->sobject));
+		return put_user(handle, (__u16 __user *)arg);
+	}
+
+	return sk->sk_prot->ioctl(sk, cmd, arg);
+}
+
+static int pn_socket_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	if (pn_socket_autobind(sock))
+		return -ENOBUFS;
+
+	lock_sock(sk);
+	if (sock->state != SS_UNCONNECTED) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (sk->sk_state != TCP_LISTEN) {
+		sk->sk_state = TCP_LISTEN;
+		sk->sk_ack_backlog = 0;
+	}
+	sk->sk_max_ack_backlog = backlog;
+out:
+	release_sock(sk);
+	return err;
+}
+
+static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock,
+				struct msghdr *m, size_t total_len)
+{
+	struct sock *sk = sock->sk;
+
+	if (pn_socket_autobind(sock))
+		return -EAGAIN;
+
+	return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
+}
+
+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,
+	.setsockopt	= sock_no_setsockopt,
+	.getsockopt	= sock_no_getsockopt,
+#ifdef CONFIG_COMPAT
+	.compat_setsockopt = sock_no_setsockopt,
+	.compat_getsockopt = sock_no_getsockopt,
+#endif
+	.sendmsg	= pn_socket_sendmsg,
+	.recvmsg	= sock_common_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage,
+};
+
+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,
+#ifdef CONFIG_COMPAT
+	.compat_setsockopt = compat_sock_common_setsockopt,
+	.compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+	.sendmsg	= pn_socket_sendmsg,
+	.recvmsg	= sock_common_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage,
+};
+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)
+{
+	struct net *net = seq_file_net(seq);
+	struct hlist_head *hlist = pnsocks.hlist;
+	struct sock *sknode;
+	unsigned int h;
+
+	for (h = 0; h < PN_HASHSIZE; h++) {
+		sk_for_each_rcu(sknode, hlist) {
+			if (!net_eq(net, sock_net(sknode)))
+				continue;
+			if (!pos)
+				return sknode;
+			pos--;
+		}
+		hlist++;
+	}
+	return NULL;
+}
+
+static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
+{
+	struct net *net = seq_file_net(seq);
+
+	do
+		sk = sk_next(sk);
+	while (sk && !net_eq(net, sock_net(sk)));
+
+	return sk;
+}
+
+static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(rcu)
+{
+	rcu_read_lock();
+	return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct sock *sk;
+
+	if (v == SEQ_START_TOKEN)
+		sk = pn_sock_get_idx(seq, 0);
+	else
+		sk = pn_sock_get_next(seq, v);
+	(*pos)++;
+	return sk;
+}
+
+static void pn_sock_seq_stop(struct seq_file *seq, void *v)
+	__releases(rcu)
+{
+	rcu_read_unlock();
+}
+
+static int pn_sock_seq_show(struct seq_file *seq, void *v)
+{
+	seq_setwidth(seq, 127);
+	if (v == SEQ_START_TOKEN)
+		seq_puts(seq, "pt  loc  rem rs st tx_queue rx_queue "
+			"  uid inode ref pointer drops");
+	else {
+		struct sock *sk = v;
+		struct pn_sock *pn = pn_sk(sk);
+
+		seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
+			"%d %pK %d",
+			sk->sk_protocol, pn->sobject, pn->dobject,
+			pn->resource, sk->sk_state,
+			sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
+			from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
+			sock_i_ino(sk),
+			atomic_read(&sk->sk_refcnt), sk,
+			atomic_read(&sk->sk_drops));
+	}
+	seq_pad(seq, '\n');
+	return 0;
+}
+
+static const struct seq_operations pn_sock_seq_ops = {
+	.start = pn_sock_seq_start,
+	.next = pn_sock_seq_next,
+	.stop = pn_sock_seq_stop,
+	.show = pn_sock_seq_show,
+};
+
+static int pn_sock_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &pn_sock_seq_ops,
+				sizeof(struct seq_net_private));
+}
+
+const struct file_operations pn_sock_seq_fops = {
+	.owner = THIS_MODULE,
+	.open = pn_sock_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release_net,
+};
+#endif
+
+static struct  {
+	struct sock *sk[256];
+} pnres;
+
+/*
+ * Find and hold socket based on resource.
+ */
+struct sock *pn_find_sock_by_res(struct net *net, u8 res)
+{
+	struct sock *sk;
+
+	if (!net_eq(net, &init_net))
+		return NULL;
+
+	rcu_read_lock();
+	sk = rcu_dereference(pnres.sk[res]);
+	if (sk)
+		sock_hold(sk);
+	rcu_read_unlock();
+	return sk;
+}
+
+static DEFINE_MUTEX(resource_mutex);
+
+int pn_sock_bind_res(struct sock *sk, u8 res)
+{
+	int ret = -EADDRINUSE;
+
+	if (!net_eq(sock_net(sk), &init_net))
+		return -ENOIOCTLCMD;
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	if (pn_socket_autobind(sk->sk_socket))
+		return -EAGAIN;
+
+	mutex_lock(&resource_mutex);
+	if (pnres.sk[res] == NULL) {
+		sock_hold(sk);
+		rcu_assign_pointer(pnres.sk[res], sk);
+		ret = 0;
+	}
+	mutex_unlock(&resource_mutex);
+	return ret;
+}
+
+int pn_sock_unbind_res(struct sock *sk, u8 res)
+{
+	int ret = -ENOENT;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	mutex_lock(&resource_mutex);
+	if (pnres.sk[res] == sk) {
+		RCU_INIT_POINTER(pnres.sk[res], NULL);
+		ret = 0;
+	}
+	mutex_unlock(&resource_mutex);
+
+	if (ret == 0) {
+		synchronize_rcu();
+		sock_put(sk);
+	}
+	return ret;
+}
+
+void pn_sock_unbind_all_res(struct sock *sk)
+{
+	unsigned int res, match = 0;
+
+	mutex_lock(&resource_mutex);
+	for (res = 0; res < 256; res++) {
+		if (pnres.sk[res] == sk) {
+			RCU_INIT_POINTER(pnres.sk[res], NULL);
+			match++;
+		}
+	}
+	mutex_unlock(&resource_mutex);
+
+	while (match > 0) {
+		__sock_put(sk);
+		match--;
+	}
+	/* Caller is responsible for RCU sync before final sock_put() */
+}
+
+#ifdef CONFIG_PROC_FS
+static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct net *net = seq_file_net(seq);
+	unsigned int i;
+
+	if (!net_eq(net, &init_net))
+		return NULL;
+
+	for (i = 0; i < 256; i++) {
+		if (pnres.sk[i] == NULL)
+			continue;
+		if (!pos)
+			return pnres.sk + i;
+		pos--;
+	}
+	return NULL;
+}
+
+static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
+{
+	struct net *net = seq_file_net(seq);
+	unsigned int i;
+
+	BUG_ON(!net_eq(net, &init_net));
+
+	for (i = (sk - pnres.sk) + 1; i < 256; i++)
+		if (pnres.sk[i])
+			return pnres.sk + i;
+	return NULL;
+}
+
+static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(resource_mutex)
+{
+	mutex_lock(&resource_mutex);
+	return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct sock **sk;
+
+	if (v == SEQ_START_TOKEN)
+		sk = pn_res_get_idx(seq, 0);
+	else
+		sk = pn_res_get_next(seq, v);
+	(*pos)++;
+	return sk;
+}
+
+static void pn_res_seq_stop(struct seq_file *seq, void *v)
+	__releases(resource_mutex)
+{
+	mutex_unlock(&resource_mutex);
+}
+
+static int pn_res_seq_show(struct seq_file *seq, void *v)
+{
+	seq_setwidth(seq, 63);
+	if (v == SEQ_START_TOKEN)
+		seq_puts(seq, "rs   uid inode");
+	else {
+		struct sock **psk = v;
+		struct sock *sk = *psk;
+
+		seq_printf(seq, "%02X %5u %lu",
+			   (int) (psk - pnres.sk),
+			   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
+			   sock_i_ino(sk));
+	}
+	seq_pad(seq, '\n');
+	return 0;
+}
+
+static const struct seq_operations pn_res_seq_ops = {
+	.start = pn_res_seq_start,
+	.next = pn_res_seq_next,
+	.stop = pn_res_seq_stop,
+	.show = pn_res_seq_show,
+};
+
+static int pn_res_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &pn_res_seq_ops,
+				sizeof(struct seq_net_private));
+}
+
+const struct file_operations pn_res_seq_fops = {
+	.owner = THIS_MODULE,
+	.open = pn_res_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release_net,
+};
+#endif

net/phonet/sysctl.c

@@ -0,0 +1,110 @@
+/*
+ * File: sysctl.c
+ *
+ * Phonet /proc/sys/net/phonet interface implementation
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/seqlock.h>
+#include <linux/sysctl.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+#include <net/sock.h>
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+
+#define DYNAMIC_PORT_MIN	0x40
+#define DYNAMIC_PORT_MAX	0x7f
+
+static DEFINE_SEQLOCK(local_port_range_lock);
+static int local_port_range_min[2] = {0, 0};
+static int local_port_range_max[2] = {1023, 1023};
+static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
+static struct ctl_table_header *phonet_table_hrd;
+
+static void set_local_port_range(int range[2])
+{
+	write_seqlock(&local_port_range_lock);
+	local_port_range[0] = range[0];
+	local_port_range[1] = range[1];
+	write_sequnlock(&local_port_range_lock);
+}
+
+void phonet_get_local_port_range(int *min, int *max)
+{
+	unsigned int seq;
+
+	do {
+		seq = read_seqbegin(&local_port_range_lock);
+		if (min)
+			*min = local_port_range[0];
+		if (max)
+			*max = local_port_range[1];
+	} while (read_seqretry(&local_port_range_lock, seq));
+}
+
+static int proc_local_port_range(struct ctl_table *table, int write,
+				void __user *buffer,
+				size_t *lenp, loff_t *ppos)
+{
+	int ret;
+	int range[2] = {local_port_range[0], local_port_range[1]};
+	struct ctl_table tmp = {
+		.data = &range,
+		.maxlen = sizeof(range),
+		.mode = table->mode,
+		.extra1 = &local_port_range_min,
+		.extra2 = &local_port_range_max,
+	};
+
+	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+	if (write && ret == 0) {
+		if (range[1] < range[0])
+			ret = -EINVAL;
+		else
+			set_local_port_range(range);
+	}
+
+	return ret;
+}
+
+static struct ctl_table phonet_table[] = {
+	{
+		.procname	= "local_port_range",
+		.data		= &local_port_range,
+		.maxlen		= sizeof(local_port_range),
+		.mode		= 0644,
+		.proc_handler	= proc_local_port_range,
+	},
+	{ }
+};
+
+int __init phonet_sysctl_init(void)
+{
+	phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
+	return phonet_table_hrd == NULL ? -ENOMEM : 0;
+}
+
+void phonet_sysctl_exit(void)
+{
+	unregister_net_sysctl_table(phonet_table_hrd);
+}