1 files changed, 394 insertions, 0 deletions

diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
new file mode 100644
index 000000000000..1779677aed46
--- /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 = %Zu, 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,
+};
+