1 files changed, 394 insertions, 0 deletions
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
new file mode 100644
index 0000000..1f5ea11
--- /dev/null
+++ b/net/ieee802154/dgram.c
@@ -0,0 +1,394 @@
+/*
+ * ZigBee socket interface
+ *
+ * Copyright 2007, 2008 Siemens AG
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by:
+ * Sergey Lapin <slapin@ossfans.org>
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ */
+
+#include <linux/net.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/list.h>
+#include <net/sock.h>
+#include <net/ieee802154/af_ieee802154.h>
+#include <net/ieee802154/mac_def.h>
+#include <net/ieee802154/netdevice.h>
+
+#include <asm/ioctls.h>
+
+#include "af802154.h"
+
+static HLIST_HEAD(dgram_head);
+static DEFINE_RWLOCK(dgram_lock);
+
+struct dgram_sock {
+	struct sock sk;
+
+	int bound;
+	struct ieee802154_addr src_addr;
+	struct ieee802154_addr dst_addr;
+};
+
+static inline struct dgram_sock *dgram_sk(const struct sock *sk)
+{
+	return container_of(sk, struct dgram_sock, sk);
+}
+
+
+static void dgram_hash(struct sock *sk)
+{
+	write_lock_bh(&dgram_lock);
+	sk_add_node(sk, &dgram_head);
+	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+	write_unlock_bh(&dgram_lock);
+}
+
+static void dgram_unhash(struct sock *sk)
+{
+	write_lock_bh(&dgram_lock);
+	if (sk_del_node_init(sk))
+		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+	write_unlock_bh(&dgram_lock);
+}
+
+static int dgram_init(struct sock *sk)
+{
+	struct dgram_sock *ro = dgram_sk(sk);
+
+	ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
+	ro->dst_addr.pan_id = 0xffff;
+	memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
+	return 0;
+}
+
+static void dgram_close(struct sock *sk, long timeout)
+{
+	sk_common_release(sk);
+}
+
+static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
+{
+	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
+	struct dgram_sock *ro = dgram_sk(sk);
+	int err = 0;
+	struct net_device *dev;
+
+	ro->bound = 0;
+
+	if (len < sizeof(*addr))
+		return -EINVAL;
+
+	if (addr->family != AF_IEEE802154)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
+	if (!dev) {
+		err = -ENODEV;
+		goto out;
+	}
+
+	if (dev->type != ARPHRD_IEEE802154) {
+		err = -ENODEV;
+		goto out_put;
+	}
+
+	memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr));
+
+	ro->bound = 1;
+out_put:
+	dev_put(dev);
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case SIOCOUTQ:
+	{
+		int amount = atomic_read(&sk->sk_wmem_alloc);
+		return put_user(amount, (int __user *)arg);
+	}
+
+	case SIOCINQ:
+	{
+		struct sk_buff *skb;
+		unsigned long amount;
+
+		amount = 0;
+		spin_lock_bh(&sk->sk_receive_queue.lock);
+		skb = skb_peek(&sk->sk_receive_queue);
+		if (skb != NULL) {
+			/*
+			 * We will only return the amount
+			 * of this packet since that is all
+			 * that will be read.
+			 */
+			/* FIXME: parse the header for more correct value */
+			amount = skb->len - (3+8+8);
+		}
+		spin_unlock_bh(&sk->sk_receive_queue.lock);
+		return put_user(amount, (int __user *)arg);
+	}
+
+	}
+	return -ENOIOCTLCMD;
+}
+
+/* FIXME: autobind */
+static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
+			int len)
+{
+	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
+	struct dgram_sock *ro = dgram_sk(sk);
+	int err = 0;
+
+	if (len < sizeof(*addr))
+		return -EINVAL;
+
+	if (addr->family != AF_IEEE802154)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	if (!ro->bound) {
+		err = -ENETUNREACH;
+		goto out;
+	}
+
+	memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr));
+
+out:
+	release_sock(sk);
+	return err;
+}
+
+static int dgram_disconnect(struct sock *sk, int flags)
+{
+	struct dgram_sock *ro = dgram_sk(sk);
+
+	lock_sock(sk);
+
+	ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
+	memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
+
+	release_sock(sk);
+
+	return 0;
+}
+
+static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
+		struct msghdr *msg, size_t size)
+{
+	struct net_device *dev;
+	unsigned mtu;
+	struct sk_buff *skb;
+	struct dgram_sock *ro = dgram_sk(sk);
+	int err;
+
+	if (msg->msg_flags & MSG_OOB) {
+		pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
+		return -EOPNOTSUPP;
+	}
+
+	if (!ro->bound)
+		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
+	else
+		dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
+
+	if (!dev) {
+		pr_debug("no dev\n");
+		err = -ENXIO;
+		goto out;
+	}
+	mtu = dev->mtu;
+	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
+
+	skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
+			msg->msg_flags & MSG_DONTWAIT,
+			&err);
+	if (!skb)
+		goto out_dev;
+
+	skb_reserve(skb, LL_RESERVED_SPACE(dev));
+
+	skb_reset_network_header(skb);
+
+	mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA | MAC_CB_FLAG_ACKREQ;
+	mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
+	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
+			ro->bound ? &ro->src_addr : NULL, size);
+	if (err < 0)
+		goto out_skb;
+
+	skb_reset_mac_header(skb);
+
+	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
+	if (err < 0)
+		goto out_skb;
+
+	if (size > mtu) {
+		pr_debug("size = %u, mtu = %u\n", size, mtu);
+		err = -EINVAL;
+		goto out_skb;
+	}
+
+	skb->dev = dev;
+	skb->sk  = sk;
+	skb->protocol = htons(ETH_P_IEEE802154);
+
+	dev_put(dev);
+
+	err = dev_queue_xmit(skb);
+	if (err > 0)
+		err = net_xmit_errno(err);
+
+	return err ?: size;
+
+out_skb:
+	kfree_skb(skb);
+out_dev:
+	dev_put(dev);
+out:
+	return err;
+}
+
+static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
+		struct msghdr *msg, size_t len, int noblock, int flags,
+		int *addr_len)
+{
+	size_t copied = 0;
+	int err = -EOPNOTSUPP;
+	struct sk_buff *skb;
+
+	skb = skb_recv_datagram(sk, flags, noblock, &err);
+	if (!skb)
+		goto out;
+
+	copied = skb->len;
+	if (len < copied) {
+		msg->msg_flags |= MSG_TRUNC;
+		copied = len;
+	}
+
+	/* FIXME: skip headers if necessary ?! */
+	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	if (err)
+		goto done;
+
+	sock_recv_timestamp(msg, sk, skb);
+
+	if (flags & MSG_TRUNC)
+		copied = skb->len;
+done:
+	skb_free_datagram(sk, skb);
+out:
+	if (err)
+		return err;
+	return copied;
+}
+
+static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	if (sock_queue_rcv_skb(sk, skb) < 0) {
+		atomic_inc(&sk->sk_drops);
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+
+	return NET_RX_SUCCESS;
+}
+
+static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id,
+		u16 short_addr, struct dgram_sock *ro)
+{
+	if (!ro->bound)
+		return 1;
+
+	if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG &&
+	    !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN))
+		return 1;
+
+	if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT &&
+		     pan_id == ro->src_addr.pan_id &&
+		     short_addr == ro->src_addr.short_addr)
+		return 1;
+
+	return 0;
+}
+
+int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
+{
+	struct sock *sk, *prev = NULL;
+	struct hlist_node *node;
+	int ret = NET_RX_SUCCESS;
+	u16 pan_id, short_addr;
+
+	/* Data frame processing */
+	BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+	pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
+	short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
+
+	read_lock(&dgram_lock);
+	sk_for_each(sk, node, &dgram_head) {
+		if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr,
+					dgram_sk(sk))) {
+			if (prev) {
+				struct sk_buff *clone;
+				clone = skb_clone(skb, GFP_ATOMIC);
+				if (clone)
+					dgram_rcv_skb(prev, clone);
+			}
+
+			prev = sk;
+		}
+	}
+
+	if (prev)
+		dgram_rcv_skb(prev, skb);
+	else {
+		kfree_skb(skb);
+		ret = NET_RX_DROP;
+	}
+	read_unlock(&dgram_lock);
+
+	return ret;
+}
+
+struct proto ieee802154_dgram_prot = {
+	.name		= "IEEE-802.15.4-MAC",
+	.owner		= THIS_MODULE,
+	.obj_size	= sizeof(struct dgram_sock),
+	.init		= dgram_init,
+	.close		= dgram_close,
+	.bind		= dgram_bind,
+	.sendmsg	= dgram_sendmsg,
+	.recvmsg	= dgram_recvmsg,
+	.hash		= dgram_hash,
+	.unhash		= dgram_unhash,
+	.connect	= dgram_connect,
+	.disconnect	= dgram_disconnect,
+	.ioctl		= dgram_ioctl,
+};
+