465 lines
9.4 KiB
C
465 lines
9.4 KiB
C
/*
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* IEEE 802.15.4 dgram socket interface
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*
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* Copyright 2007, 2008 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Sergey Lapin <slapin@ossfans.org>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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*/
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#include <linux/net.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/af_ieee802154.h>
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#include <net/ieee802154.h>
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#include <net/ieee802154_netdev.h>
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#include <asm/ioctls.h>
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#include "af802154.h"
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static HLIST_HEAD(dgram_head);
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static DEFINE_RWLOCK(dgram_lock);
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struct dgram_sock {
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struct sock sk;
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struct ieee802154_addr src_addr;
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struct ieee802154_addr dst_addr;
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unsigned int bound:1;
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unsigned int want_ack:1;
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};
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static inline struct dgram_sock *dgram_sk(const struct sock *sk)
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{
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return container_of(sk, struct dgram_sock, sk);
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}
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static void dgram_hash(struct sock *sk)
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{
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write_lock_bh(&dgram_lock);
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sk_add_node(sk, &dgram_head);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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write_unlock_bh(&dgram_lock);
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}
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static void dgram_unhash(struct sock *sk)
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{
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write_lock_bh(&dgram_lock);
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if (sk_del_node_init(sk))
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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write_unlock_bh(&dgram_lock);
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}
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static int dgram_init(struct sock *sk)
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{
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struct dgram_sock *ro = dgram_sk(sk);
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ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
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ro->dst_addr.pan_id = 0xffff;
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ro->want_ack = 1;
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memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
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return 0;
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}
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static void dgram_close(struct sock *sk, long timeout)
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{
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sk_common_release(sk);
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}
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static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
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{
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struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
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struct dgram_sock *ro = dgram_sk(sk);
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int err = -EINVAL;
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struct net_device *dev;
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lock_sock(sk);
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ro->bound = 0;
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if (len < sizeof(*addr))
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goto out;
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if (addr->family != AF_IEEE802154)
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goto out;
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dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
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if (!dev) {
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err = -ENODEV;
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goto out;
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}
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if (dev->type != ARPHRD_IEEE802154) {
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err = -ENODEV;
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goto out_put;
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}
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memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr));
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ro->bound = 1;
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err = 0;
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out_put:
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dev_put(dev);
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out:
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release_sock(sk);
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return err;
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}
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static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
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{
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switch (cmd) {
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case SIOCOUTQ:
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{
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int amount = sk_wmem_alloc_get(sk);
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return put_user(amount, (int __user *)arg);
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}
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case SIOCINQ:
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{
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struct sk_buff *skb;
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unsigned long amount;
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amount = 0;
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spin_lock_bh(&sk->sk_receive_queue.lock);
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skb = skb_peek(&sk->sk_receive_queue);
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if (skb != NULL) {
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/*
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* We will only return the amount
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* of this packet since that is all
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* that will be read.
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*/
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/* FIXME: parse the header for more correct value */
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amount = skb->len - (3+8+8);
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}
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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return put_user(amount, (int __user *)arg);
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}
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}
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return -ENOIOCTLCMD;
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}
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/* FIXME: autobind */
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static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
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int len)
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{
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struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
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struct dgram_sock *ro = dgram_sk(sk);
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int err = 0;
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if (len < sizeof(*addr))
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return -EINVAL;
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if (addr->family != AF_IEEE802154)
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return -EINVAL;
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lock_sock(sk);
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if (!ro->bound) {
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err = -ENETUNREACH;
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goto out;
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}
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memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr));
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out:
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release_sock(sk);
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return err;
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}
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static int dgram_disconnect(struct sock *sk, int flags)
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{
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struct dgram_sock *ro = dgram_sk(sk);
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lock_sock(sk);
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ro->dst_addr.addr_type = IEEE802154_ADDR_LONG;
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memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr));
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release_sock(sk);
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return 0;
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}
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static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t size)
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{
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struct net_device *dev;
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unsigned int mtu;
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struct sk_buff *skb;
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struct dgram_sock *ro = dgram_sk(sk);
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int hlen, tlen;
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int err;
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if (msg->msg_flags & MSG_OOB) {
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pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
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return -EOPNOTSUPP;
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}
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if (!ro->bound)
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dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
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else
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dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
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if (!dev) {
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pr_debug("no dev\n");
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err = -ENXIO;
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goto out;
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}
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mtu = dev->mtu;
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pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
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hlen = LL_RESERVED_SPACE(dev);
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tlen = dev->needed_tailroom;
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skb = sock_alloc_send_skb(sk, hlen + tlen + size,
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msg->msg_flags & MSG_DONTWAIT,
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&err);
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if (!skb)
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goto out_dev;
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skb_reserve(skb, hlen);
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skb_reset_network_header(skb);
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mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
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if (ro->want_ack)
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mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
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mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
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err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
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ro->bound ? &ro->src_addr : NULL, size);
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if (err < 0)
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goto out_skb;
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skb_reset_mac_header(skb);
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err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
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if (err < 0)
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goto out_skb;
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if (size > mtu) {
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pr_debug("size = %Zu, mtu = %u\n", size, mtu);
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err = -EINVAL;
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goto out_skb;
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}
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skb->dev = dev;
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skb->sk = sk;
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skb->protocol = htons(ETH_P_IEEE802154);
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dev_put(dev);
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err = dev_queue_xmit(skb);
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if (err > 0)
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err = net_xmit_errno(err);
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return err ?: size;
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out_skb:
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kfree_skb(skb);
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out_dev:
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dev_put(dev);
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out:
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return err;
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}
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static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len, int noblock, int flags,
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int *addr_len)
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{
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size_t copied = 0;
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int err = -EOPNOTSUPP;
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struct sk_buff *skb;
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skb = skb_recv_datagram(sk, flags, noblock, &err);
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if (!skb)
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goto out;
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copied = skb->len;
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if (len < copied) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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/* FIXME: skip headers if necessary ?! */
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err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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if (err)
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goto done;
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sock_recv_ts_and_drops(msg, sk, skb);
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if (flags & MSG_TRUNC)
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copied = skb->len;
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done:
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skb_free_datagram(sk, skb);
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out:
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if (err)
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return err;
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return copied;
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}
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static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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if (sock_queue_rcv_skb(sk, skb) < 0) {
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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return NET_RX_SUCCESS;
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}
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static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id,
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u16 short_addr, struct dgram_sock *ro)
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{
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if (!ro->bound)
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return 1;
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if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG &&
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!memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN))
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return 1;
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if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT &&
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pan_id == ro->src_addr.pan_id &&
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short_addr == ro->src_addr.short_addr)
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return 1;
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return 0;
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}
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int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
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{
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struct sock *sk, *prev = NULL;
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struct hlist_node *node;
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int ret = NET_RX_SUCCESS;
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u16 pan_id, short_addr;
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/* Data frame processing */
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BUG_ON(dev->type != ARPHRD_IEEE802154);
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pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
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short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
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read_lock(&dgram_lock);
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sk_for_each(sk, node, &dgram_head) {
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if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr,
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dgram_sk(sk))) {
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if (prev) {
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struct sk_buff *clone;
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clone = skb_clone(skb, GFP_ATOMIC);
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if (clone)
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dgram_rcv_skb(prev, clone);
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}
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prev = sk;
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}
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}
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if (prev)
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dgram_rcv_skb(prev, skb);
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else {
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kfree_skb(skb);
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ret = NET_RX_DROP;
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}
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read_unlock(&dgram_lock);
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return ret;
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}
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static int dgram_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct dgram_sock *ro = dgram_sk(sk);
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int val, len;
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if (level != SOL_IEEE802154)
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return -EOPNOTSUPP;
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if (get_user(len, optlen))
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return -EFAULT;
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len = min_t(unsigned int, len, sizeof(int));
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switch (optname) {
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case WPAN_WANTACK:
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val = ro->want_ack;
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break;
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default:
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return -ENOPROTOOPT;
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}
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if (put_user(len, optlen))
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return -EFAULT;
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if (copy_to_user(optval, &val, len))
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return -EFAULT;
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return 0;
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}
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static int dgram_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, unsigned int optlen)
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{
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struct dgram_sock *ro = dgram_sk(sk);
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int val;
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int err = 0;
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if (optlen < sizeof(int))
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return -EINVAL;
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if (get_user(val, (int __user *)optval))
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return -EFAULT;
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lock_sock(sk);
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switch (optname) {
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case WPAN_WANTACK:
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ro->want_ack = !!val;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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return err;
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}
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struct proto ieee802154_dgram_prot = {
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.name = "IEEE-802.15.4-MAC",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct dgram_sock),
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.init = dgram_init,
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.close = dgram_close,
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.bind = dgram_bind,
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.sendmsg = dgram_sendmsg,
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.recvmsg = dgram_recvmsg,
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.hash = dgram_hash,
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.unhash = dgram_unhash,
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.connect = dgram_connect,
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.disconnect = dgram_disconnect,
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.ioctl = dgram_ioctl,
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.getsockopt = dgram_getsockopt,
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.setsockopt = dgram_setsockopt,
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};
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