| /* |
| * 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/af_ieee802154.h> |
| #include <net/ieee802154.h> |
| #include <net/ieee802154_netdev.h> |
| |
| #include <asm/ioctls.h> |
| |
| #include "af802154.h" |
| |
| static HLIST_HEAD(dgram_head); |
| static DEFINE_RWLOCK(dgram_lock); |
| |
| struct dgram_sock { |
| struct sock sk; |
| |
| struct ieee802154_addr src_addr; |
| struct ieee802154_addr dst_addr; |
| |
| unsigned bound:1; |
| unsigned want_ack:1; |
| }; |
| |
| 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; |
| ro->want_ack = 1; |
| 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 = -EINVAL; |
| struct net_device *dev; |
| |
| lock_sock(sk); |
| |
| ro->bound = 0; |
| |
| if (len < sizeof(*addr)) |
| goto out; |
| |
| if (addr->family != AF_IEEE802154) |
| goto out; |
| |
| 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; |
| err = 0; |
| 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 = sk_wmem_alloc_get(sk); |
| |
| 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; |
| if (ro->want_ack) |
| mac_cb(skb)->flags |= 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_ts_and_drops(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; |
| } |
| |
| static int dgram_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct dgram_sock *ro = dgram_sk(sk); |
| |
| int val, len; |
| |
| if (level != SOL_IEEE802154) |
| return -EOPNOTSUPP; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| len = min_t(unsigned int, len, sizeof(int)); |
| |
| switch (optname) { |
| case WPAN_WANTACK: |
| val = ro->want_ack; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &val, len)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int dgram_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| struct dgram_sock *ro = dgram_sk(sk); |
| int val; |
| int err = 0; |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (get_user(val, (int __user *)optval)) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| |
| switch (optname) { |
| case WPAN_WANTACK: |
| ro->want_ack = !!val; |
| break; |
| default: |
| err = -ENOPROTOOPT; |
| break; |
| } |
| |
| release_sock(sk); |
| return err; |
| } |
| |
| 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, |
| .getsockopt = dgram_getsockopt, |
| .setsockopt = dgram_setsockopt, |
| }; |
| |