linux/net/ieee802154/dgram.c

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/*
* IEEE 802.15.4 dgram 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.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 int bound:1;
unsigned int 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 int mtu;
struct sk_buff *skb;
struct dgram_sock *ro = dgram_sk(sk);
int hlen, tlen;
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);
if (size > mtu) {
pr_debug("size = %Zu, mtu = %u\n", size, mtu);
err = -EINVAL;
goto out_dev;
}
hlen = LL_RESERVED_SPACE(dev);
tlen = dev->needed_tailroom;
skb = sock_alloc_send_skb(sk, hlen + tlen + size,
msg->msg_flags & MSG_DONTWAIT,
&err);
if (!skb)
goto out_dev;
skb_reserve(skb, hlen);
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;
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;
net: Generalize socket rx gap / receive queue overflow cmsg Create a new socket level option to report number of queue overflows Recently I augmented the AF_PACKET protocol to report the number of frames lost on the socket receive queue between any two enqueued frames. This value was exported via a SOL_PACKET level cmsg. AFter I completed that work it was requested that this feature be generalized so that any datagram oriented socket could make use of this option. As such I've created this patch, It creates a new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue overflowed between any two given frames. It also augments the AF_PACKET protocol to take advantage of this new feature (as it previously did not touch sk->sk_drops, which this patch uses to record the overflow count). Tested successfully by me. Notes: 1) Unlike my previous patch, this patch simply records the sk_drops value, which is not a number of drops between packets, but rather a total number of drops. Deltas must be computed in user space. 2) While this patch currently works with datagram oriented protocols, it will also be accepted by non-datagram oriented protocols. I'm not sure if thats agreeable to everyone, but my argument in favor of doing so is that, for those protocols which aren't applicable to this option, sk_drops will always be zero, and reporting no drops on a receive queue that isn't used for those non-participating protocols seems reasonable to me. This also saves us having to code in a per-protocol opt in mechanism. 3) This applies cleanly to net-next assuming that commit 977750076d98c7ff6cbda51858bb5a5894a9d9ab (my af packet cmsg patch) is reverted Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-13 04:26:31 +08:00
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) {
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,
};