766e9037cc
sock_queue_rcv_skb() can update sk_drops itself, removing need for callers to take care of it. This is more consistent since sock_queue_rcv_skb() also reads sk_drops when queueing a skb. This adds sk_drops managment to many protocols that not cared yet. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
266 lines
5.4 KiB
C
266 lines
5.4 KiB
C
/*
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* Raw IEEE 802.15.4 sockets
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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 <net/sock.h>
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#include <net/af_ieee802154.h>
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#include "af802154.h"
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static HLIST_HEAD(raw_head);
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static DEFINE_RWLOCK(raw_lock);
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static void raw_hash(struct sock *sk)
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{
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write_lock_bh(&raw_lock);
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sk_add_node(sk, &raw_head);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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write_unlock_bh(&raw_lock);
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}
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static void raw_unhash(struct sock *sk)
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{
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write_lock_bh(&raw_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(&raw_lock);
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}
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static void raw_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 raw_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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int err = 0;
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struct net_device *dev = NULL;
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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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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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sk->sk_bound_dev_if = dev->ifindex;
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sk_dst_reset(sk);
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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 raw_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len)
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{
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return -ENOTSUPP;
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}
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static int raw_disconnect(struct sock *sk, int flags)
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{
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return 0;
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}
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static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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size_t size)
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{
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struct net_device *dev;
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unsigned mtu;
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struct sk_buff *skb;
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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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lock_sock(sk);
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if (!sk->sk_bound_dev_if)
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dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
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else
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dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
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release_sock(sk);
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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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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_dev;
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}
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skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
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msg->msg_flags & MSG_DONTWAIT, &err);
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if (!skb)
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goto out_dev;
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reset_mac_header(skb);
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skb_reset_network_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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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 raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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size_t len, int noblock, int flags, 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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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 raw_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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void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
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{
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struct sock *sk;
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struct hlist_node *node;
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read_lock(&raw_lock);
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sk_for_each(sk, node, &raw_head) {
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bh_lock_sock(sk);
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if (!sk->sk_bound_dev_if ||
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sk->sk_bound_dev_if == dev->ifindex) {
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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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raw_rcv_skb(sk, clone);
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}
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bh_unlock_sock(sk);
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}
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read_unlock(&raw_lock);
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}
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static int raw_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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return -EOPNOTSUPP;
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}
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static int raw_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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return -EOPNOTSUPP;
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}
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struct proto ieee802154_raw_prot = {
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.name = "IEEE-802.15.4-RAW",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct sock),
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.close = raw_close,
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.bind = raw_bind,
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.sendmsg = raw_sendmsg,
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.recvmsg = raw_recvmsg,
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.hash = raw_hash,
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.unhash = raw_unhash,
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.connect = raw_connect,
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.disconnect = raw_disconnect,
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.getsockopt = raw_getsockopt,
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.setsockopt = raw_setsockopt,
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};
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