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Phonet: implement GPRS virtual interface over PEP socket 

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2008-10-05 11:16:16 -07:00 committed by David S. Miller
parent c41bd97f81
commit 02a47617cd
8 changed files with 550 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/phonet.h
View File

@ -31,9 +31,17 @@
#define PN_PROTO_PIPE 2
#define PHONET_NPROTO 3
/* Socket options for SOL_PNPIPE level */
#define PNPIPE_ENCAP 1
#define PNPIPE_IFINDEX 2
#define PNADDR_ANY 0
#define PNPORT_RESOURCE_ROUTING 0
/* Values for PNPIPE_ENCAP option */
#define PNPIPE_ENCAP_NONE 0
#define PNPIPE_ENCAP_IP 1
/* ioctls */
#define SIOCPNGETOBJECT (SIOCPROTOPRIVATE + 0)

1
include/linux/socket.h
View File

@ -297,6 +297,7 @@ struct ucred {
#define SOL_RXRPC 272
#define SOL_PPPOL2TP 273
#define SOL_BLUETOOTH 274
#define SOL_PNPIPE 275
/* IPX options */
#define IPX_TYPE 1

38
include/net/phonet/gprs.h Normal file
View File

@ -0,0 +1,38 @@
/*
* File: pep_gprs.h
*
* GPRS over Phonet pipe end point socket
*
* Copyright (C) 2008 Nokia Corporation.
*
* Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
*
* 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef NET_PHONET_GPRS_H
#define NET_PHONET_GPRS_H
struct sock;
struct sk_buff;
int pep_writeable(struct sock *sk);
int pep_write(struct sock *sk, struct sk_buff *skb);
struct sk_buff *pep_read(struct sock *sk);
int gprs_attach(struct sock *sk);
void gprs_detach(struct sock *sk);
#endif

1
include/net/phonet/pep.h
View File

@ -35,6 +35,7 @@ struct pep_sock {
struct sock *listener;
struct sk_buff_head ctrlreq_queue;
#define PNPIPE_CTRLREQ_MAX 10
int ifindex;
u16 peer_type; /* peer type/subtype */
u8 pipe_handle;

2
net/phonet/Makefile
View File

@ -8,4 +8,4 @@ phonet-objs := \
sysctl.o \
af_phonet.o
pn_pep-objs := pep.o
pn_pep-objs := pep.o pep-gprs.o

347
net/phonet/pep-gprs.c Normal file
View File

@ -0,0 +1,347 @@
/*
* File: pep-gprs.c
*
* GPRS over Phonet pipe end point socket
*
* Copyright (C) 2008 Nokia Corporation.
*
* Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
*
* 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <net/sock.h>
#include <linux/if_phonet.h>
#include <net/tcp_states.h>
#include <net/phonet/gprs.h>
#define GPRS_DEFAULT_MTU 1400
struct gprs_dev {
struct sock *sk;
void (*old_state_change)(struct sock *);
void (*old_data_ready)(struct sock *, int);
void (*old_write_space)(struct sock *);
struct net_device *net;
struct net_device_stats stats;
struct sk_buff_head tx_queue;
struct work_struct tx_work;
spinlock_t tx_lock;
unsigned tx_max;
};
static int gprs_type_trans(struct sk_buff *skb)
{
const u8 *pvfc;
u8 buf;
pvfc = skb_header_pointer(skb, 0, 1, &buf);
if (!pvfc)
return 0;
/* Look at IP version field */
switch (*pvfc >> 4) {
case 4:
return htons(ETH_P_IP);
case 6:
return htons(ETH_P_IPV6);
}
return 0;
}
/*
* Socket callbacks
*/
static void gprs_state_change(struct sock *sk)
{
struct gprs_dev *dev = sk->sk_user_data;
if (sk->sk_state == TCP_CLOSE_WAIT) {
netif_stop_queue(dev->net);
netif_carrier_off(dev->net);
}
}
static int gprs_recv(struct gprs_dev *dev, struct sk_buff *skb)
{
int err = 0;
u16 protocol = gprs_type_trans(skb);
if (!protocol) {
err = -EINVAL;
goto drop;
}
if (likely(skb_headroom(skb) & 3)) {
struct sk_buff *rskb, *fs;
int flen = 0;
/* Phonet Pipe data header is misaligned (3 bytes),
* so wrap the IP packet as a single fragment of an head-less
* socket buffer. The network stack will pull what it needs,
* but at least, the whole IP payload is not memcpy'd. */
rskb = netdev_alloc_skb(dev->net, 0);
if (!rskb) {
err = -ENOBUFS;
goto drop;
}
skb_shinfo(rskb)->frag_list = skb;
rskb->len += skb->len;
rskb->data_len += rskb->len;
rskb->truesize += rskb->len;
/* Avoid nested fragments */
for (fs = skb_shinfo(skb)->frag_list; fs; fs = fs->next)
flen += fs->len;
skb->next = skb_shinfo(skb)->frag_list;
skb_shinfo(skb)->frag_list = NULL;
skb->len -= flen;
skb->data_len -= flen;
skb->truesize -= flen;
skb = rskb;
}
skb->protocol = protocol;
skb_reset_mac_header(skb);
skb->dev = dev->net;
if (likely(dev->net->flags & IFF_UP)) {
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
netif_rx(skb);
skb = NULL;
} else
err = -ENODEV;
drop:
if (skb) {
dev_kfree_skb(skb);
dev->stats.rx_dropped++;
}
return err;
}
static void gprs_data_ready(struct sock *sk, int len)
{
struct gprs_dev *dev = sk->sk_user_data;
struct sk_buff *skb;
while ((skb = pep_read(sk)) != NULL) {
skb_orphan(skb);
gprs_recv(dev, skb);
}
}
static void gprs_write_space(struct sock *sk)
{
struct gprs_dev *dev = sk->sk_user_data;
unsigned credits = pep_writeable(sk);
spin_lock_bh(&dev->tx_lock);
dev->tx_max = credits;
if (credits > skb_queue_len(&dev->tx_queue))
netif_wake_queue(dev->net);
spin_unlock_bh(&dev->tx_lock);
}
/*
* Network device callbacks
*/
static int gprs_xmit(struct sk_buff *skb, struct net_device *net)
{
struct gprs_dev *dev = netdev_priv(net);
switch (skb->protocol) {
case htons(ETH_P_IP):
case htons(ETH_P_IPV6):
break;
default:
dev_kfree_skb(skb);
return 0;
}
spin_lock(&dev->tx_lock);
if (likely(skb_queue_len(&dev->tx_queue) < dev->tx_max)) {
skb_queue_tail(&dev->tx_queue, skb);
skb = NULL;
}
if (skb_queue_len(&dev->tx_queue) >= dev->tx_max)
netif_stop_queue(net);
spin_unlock(&dev->tx_lock);
schedule_work(&dev->tx_work);
if (unlikely(skb))
dev_kfree_skb(skb);
return 0;
}
static void gprs_tx(struct work_struct *work)
{
struct gprs_dev *dev = container_of(work, struct gprs_dev, tx_work);
struct sock *sk = dev->sk;
struct sk_buff *skb;
while ((skb = skb_dequeue(&dev->tx_queue)) != NULL) {
int err;
dev->stats.tx_bytes += skb->len;
dev->stats.tx_packets++;
skb_orphan(skb);
skb_set_owner_w(skb, sk);
lock_sock(sk);
err = pep_write(sk, skb);
if (err) {
LIMIT_NETDEBUG(KERN_WARNING"%s: TX error (%d)\n",
dev->net->name, err);
dev->stats.tx_aborted_errors++;
dev->stats.tx_errors++;
}
release_sock(sk);
}
lock_sock(sk);
gprs_write_space(sk);
release_sock(sk);
}
static int gprs_set_mtu(struct net_device *net, int new_mtu)
{
if ((new_mtu < 576) || (new_mtu > (PHONET_MAX_MTU - 11)))
return -EINVAL;
net->mtu = new_mtu;
return 0;
}
static struct net_device_stats *gprs_get_stats(struct net_device *net)
{
struct gprs_dev *dev = netdev_priv(net);
return &dev->stats;
}
static void gprs_setup(struct net_device *net)
{
net->features = NETIF_F_FRAGLIST;
net->type = ARPHRD_NONE;
net->flags = IFF_POINTOPOINT | IFF_NOARP;
net->mtu = GPRS_DEFAULT_MTU;
net->hard_header_len = 0;
net->addr_len = 0;
net->tx_queue_len = 10;
net->destructor = free_netdev;
net->hard_start_xmit = gprs_xmit; /* mandatory */
net->change_mtu = gprs_set_mtu;
net->get_stats = gprs_get_stats;
}
/*
* External interface
*/
/*
* Attach a GPRS interface to a datagram socket.
* Returns the interface index on success, negative error code on error.
*/
int gprs_attach(struct sock *sk)
{
static const char ifname[] = "gprs%d";
struct gprs_dev *dev;
struct net_device *net;
int err;
if (unlikely(sk->sk_type == SOCK_STREAM))
return -EINVAL; /* need packet boundaries */
/* Create net device */
net = alloc_netdev(sizeof(*dev), ifname, gprs_setup);
if (!net)
return -ENOMEM;
dev = netdev_priv(net);
dev->net = net;
dev->tx_max = 0;
spin_lock_init(&dev->tx_lock);
skb_queue_head_init(&dev->tx_queue);
INIT_WORK(&dev->tx_work, gprs_tx);
netif_stop_queue(net);
err = register_netdev(net);
if (err) {
free_netdev(net);
return err;
}
lock_sock(sk);
if (unlikely(sk->sk_user_data)) {
err = -EBUSY;
goto out_rel;
}
if (unlikely((1 << sk->sk_state & (TCPF_CLOSE|TCPF_LISTEN)) ||
sock_flag(sk, SOCK_DEAD))) {
err = -EINVAL;
goto out_rel;
}
sk->sk_user_data = dev;
dev->old_state_change = sk->sk_state_change;
dev->old_data_ready = sk->sk_data_ready;
dev->old_write_space = sk->sk_write_space;
sk->sk_state_change = gprs_state_change;
sk->sk_data_ready = gprs_data_ready;
sk->sk_write_space = gprs_write_space;
release_sock(sk);
sock_hold(sk);
dev->sk = sk;
printk(KERN_DEBUG"%s: attached\n", net->name);
gprs_write_space(sk); /* kick off TX */
return net->ifindex;
out_rel:
release_sock(sk);
unregister_netdev(net);
return err;
}
void gprs_detach(struct sock *sk)
{
struct gprs_dev *dev = sk->sk_user_data;
struct net_device *net = dev->net;
lock_sock(sk);
sk->sk_user_data = NULL;
sk->sk_state_change = dev->old_state_change;
sk->sk_data_ready = dev->old_data_ready;
sk->sk_write_space = dev->old_write_space;
release_sock(sk);
printk(KERN_DEBUG"%s: detached\n", net->name);
unregister_netdev(net);
flush_scheduled_work();
sock_put(sk);
skb_queue_purge(&dev->tx_queue);
}

161
net/phonet/pep.c
View File

@ -31,6 +31,7 @@
#include <linux/phonet.h>
#include <net/phonet/phonet.h>
#include <net/phonet/pep.h>
#include <net/phonet/gprs.h>
/* sk_state values:
* TCP_CLOSE sock not in use yet
@ -612,6 +613,7 @@ drop:
static void pep_sock_close(struct sock *sk, long timeout)
{
struct pep_sock *pn = pep_sk(sk);
int ifindex = 0;
sk_common_release(sk);
@ -625,7 +627,12 @@ static void pep_sock_close(struct sock *sk, long timeout)
sk_del_node_init(sknode);
sk->sk_state = TCP_CLOSE;
}
ifindex = pn->ifindex;
pn->ifindex = 0;
release_sock(sk);
if (ifindex)
gprs_detach(sk);
}
static int pep_wait_connreq(struct sock *sk, int noblock)
@ -730,12 +737,107 @@ static int pep_init(struct sock *sk)
return 0;
}
static int pep_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
{
struct pep_sock *pn = pep_sk(sk);
int val = 0, err = 0;
if (level != SOL_PNPIPE)
return -ENOPROTOOPT;
if (optlen >= sizeof(int)) {
if (get_user(val, (int __user *) optval))
return -EFAULT;
}
lock_sock(sk);
switch (optname) {
case PNPIPE_ENCAP:
if (val && val != PNPIPE_ENCAP_IP) {
err = -EINVAL;
break;
}
if (!pn->ifindex == !val)
break; /* Nothing to do! */
if (!capable(CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
if (val) {
release_sock(sk);
err = gprs_attach(sk);
if (err > 0) {
pn->ifindex = err;
err = 0;
}
} else {
pn->ifindex = 0;
release_sock(sk);
gprs_detach(sk);
err = 0;
}
goto out_norel;
default:
err = -ENOPROTOOPT;
}
release_sock(sk);
out_norel:
return err;
}
static int pep_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
struct pep_sock *pn = pep_sk(sk);
int len, val;
if (level != SOL_PNPIPE)
return -ENOPROTOOPT;
if (get_user(len, optlen))
return -EFAULT;
switch (optname) {
case PNPIPE_ENCAP:
val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
break;
case PNPIPE_IFINDEX:
val = pn->ifindex;
break;
default:
return -ENOPROTOOPT;
}
len = min_t(unsigned int, sizeof(int), len);
if (put_user(len, optlen))
return -EFAULT;
if (put_user(val, (int __user *) optval))
return -EFAULT;
return 0;
}
static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
{
struct pep_sock *pn = pep_sk(sk);
struct pnpipehdr *ph;
skb_push(skb, 3);
skb_reset_transport_header(skb);
ph = pnp_hdr(skb);
ph->utid = 0;
ph->message_id = PNS_PIPE_DATA;
ph->pipe_handle = pn->pipe_handle;
if (pn_flow_safe(pn->tx_fc) && pn->tx_credits)
pn->tx_credits--;
return pn_skb_send(sk, skb, &pipe_srv);
}
static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len)
{
struct pep_sock *pn = pep_sk(sk);
struct sk_buff *skb = NULL;
struct pnpipehdr *ph;
long timeo;
int flags = msg->msg_flags;
int err, done;
@ -801,16 +903,7 @@ disabled:
if (err < 0)
goto out;
__skb_push(skb, 3);
skb_reset_transport_header(skb);
ph = pnp_hdr(skb);
ph->utid = 0;
ph->message_id = PNS_PIPE_DATA;
ph->pipe_handle = pn->pipe_handle;
if (pn_flow_safe(pn->tx_fc)) /* credit-based flow control */
pn->tx_credits--;
err = pn_skb_send(sk, skb, &pipe_srv);
err = pipe_skb_send(sk, skb);
if (err >= 0)
err = len; /* success! */
skb = NULL;
@ -820,6 +913,50 @@ out:
return err;
}
int pep_writeable(struct sock *sk)
{
struct pep_sock *pn = pep_sk(sk);
return (sk->sk_state == TCP_ESTABLISHED) ? pn->tx_credits : 0;
}
int pep_write(struct sock *sk, struct sk_buff *skb)
{
struct sk_buff *rskb, *fs;
int flen = 0;
rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
if (!rskb) {
kfree_skb(skb);
return -ENOMEM;
}
skb_shinfo(rskb)->frag_list = skb;
rskb->len += skb->len;
rskb->data_len += rskb->len;
rskb->truesize += rskb->len;
/* Avoid nested fragments */
for (fs = skb_shinfo(skb)->frag_list; fs; fs = fs->next)
flen += fs->len;
skb->next = skb_shinfo(skb)->frag_list;
skb_shinfo(skb)->frag_list = NULL;
skb->len -= flen;
skb->data_len -= flen;
skb->truesize -= flen;
skb_reserve(rskb, MAX_PHONET_HEADER + 3);
return pipe_skb_send(sk, rskb);
}
struct sk_buff *pep_read(struct sock *sk)
{
struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
if (sk->sk_state == TCP_ESTABLISHED)
pipe_grant_credits(sk);
return skb;
}
static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len, int noblock,
int flags, int *addr_len)
@ -902,6 +1039,8 @@ static struct proto pep_proto = {
.accept = pep_sock_accept,
.ioctl = pep_ioctl,
.init = pep_init,
.setsockopt = pep_setsockopt,
.getsockopt = pep_getsockopt,
.sendmsg = pep_sendmsg,
.recvmsg = pep_recvmsg,
.backlog_rcv = pep_do_rcv,

8
net/phonet/socket.c
View File

@ -342,11 +342,11 @@ const struct proto_ops phonet_stream_ops = {
.ioctl = pn_socket_ioctl,
.listen = pn_socket_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
#ifdef CONFIG_COMPAT
.compat_setsockopt = sock_no_setsockopt,
.compat_getsockopt = compat_sock_no_getsockopt,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
.sendmsg = pn_socket_sendmsg,
.recvmsg = sock_common_recvmsg,