aboutsummaryrefslogtreecommitdiff
path: root/net/phonet
diff options
context:
space:
mode:
authorRémi Denis-Courmont <remi.denis-courmont@nokia.com>2008-10-05 11:16:16 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-05 11:16:16 -0700
commit02a47617cdce440f60c71a51f3a93f9f5fcc5a7a (patch)
tree2f65d9978345b8eafdaf926a3342424a21c6e57a /net/phonet
parentc41bd97f815720f9404f97da0c4f4400b52c243d (diff)
downloadlinux-2.6.38-lt-ux500-02a47617cdce440f60c71a51f3a93f9f5fcc5a7a.tar.gz
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>
Diffstat (limited to 'net/phonet')
-rw-r--r--net/phonet/Makefile2
-rw-r--r--net/phonet/pep-gprs.c347
-rw-r--r--net/phonet/pep.c161
-rw-r--r--net/phonet/socket.c8
4 files changed, 502 insertions, 16 deletions
diff --git a/net/phonet/Makefile b/net/phonet/Makefile
index 505df2a04a8..d62bbba649b 100644
--- a/net/phonet/Makefile
+++ b/net/phonet/Makefile
@@ -8,4 +8,4 @@ phonet-objs := \
sysctl.o \
af_phonet.o
-pn_pep-objs := pep.o
+pn_pep-objs := pep.o pep-gprs.o
diff --git a/net/phonet/pep-gprs.c b/net/phonet/pep-gprs.c
new file mode 100644
index 00000000000..9978afbd9f2
--- /dev/null
+++ b/net/phonet/pep-gprs.c
@@ -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);
+}
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index d564d07cb79..bc6d50f8324 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -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,
diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index a9c3d1f2e9d..d81740187fb 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -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,