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authorRemi Denis-Courmont <remi.denis-courmont@nokia.com>2008-09-22 20:02:10 -0700
committerDavid S. Miller <davem@davemloft.net>2008-09-22 20:02:10 -0700
commit4b07b3f69a8471cdc142c51461a331226fef248a (patch)
tree661b8c841ad2e3922f22f585f8628083baa03546 /net/phonet
parentbce7b15426cac3000bf6a9cf59d9356ef0be2dec (diff)
downloadlinux-2.6.38-lt-ux500-4b07b3f69a8471cdc142c51461a331226fef248a.tar.gz
Phonet: PF_PHONET protocol family support
This is the basis for the Phonet protocol families, and introduces the ETH_P_PHONET packet type and the PF_PHONET socket family. Signed-off-by: Remi 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/af_phonet.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
new file mode 100644
index 00000000000..0cfea9bc994
--- /dev/null
+++ b/net/phonet/af_phonet.c
@@ -0,0 +1,216 @@
+/*
+ * File: af_phonet.c
+ *
+ * Phonet protocols family
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
+ * Original author: Sakari Ailus <sakari.ailus@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/module.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+
+#include <linux/if_phonet.h>
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+
+static struct net_proto_family phonet_proto_family;
+static struct phonet_protocol *phonet_proto_get(int protocol);
+static inline void phonet_proto_put(struct phonet_protocol *pp);
+
+/* protocol family functions */
+
+static int pn_socket_create(struct net *net, struct socket *sock, int protocol)
+{
+ struct phonet_protocol *pnp;
+ int err;
+
+ if (net != &init_net)
+ return -EAFNOSUPPORT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (protocol == 0) {
+ /* Default protocol selection */
+ switch (sock->type) {
+ case SOCK_DGRAM:
+ protocol = PN_PROTO_PHONET;
+ break;
+ default:
+ return -EPROTONOSUPPORT;
+ }
+ }
+
+ pnp = phonet_proto_get(protocol);
+ if (pnp == NULL)
+ return -EPROTONOSUPPORT;
+ if (sock->type != pnp->sock_type) {
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+
+ /* TODO: create and init the struct sock */
+ err = -EPROTONOSUPPORT;
+
+out:
+ phonet_proto_put(pnp);
+ return err;
+}
+
+static struct net_proto_family phonet_proto_family = {
+ .family = AF_PHONET,
+ .create = pn_socket_create,
+ .owner = THIS_MODULE,
+};
+
+/* packet type functions */
+
+/*
+ * Stuff received packets to associated sockets.
+ * On error, returns non-zero and releases the skb.
+ */
+static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pkttype,
+ struct net_device *orig_dev)
+{
+ struct phonethdr *ph;
+ struct sockaddr_pn sa;
+ u16 len;
+
+ if (dev_net(dev) != &init_net)
+ goto out;
+
+ /* check we have at least a full Phonet header */
+ if (!pskb_pull(skb, sizeof(struct phonethdr)))
+ goto out;
+
+ /* check that the advertised length is correct */
+ ph = pn_hdr(skb);
+ len = get_unaligned_be16(&ph->pn_length);
+ if (len < 2)
+ goto out;
+ len -= 2;
+ if ((len > skb->len) || pskb_trim(skb, len))
+ goto out;
+ skb_reset_transport_header(skb);
+
+ pn_skb_get_dst_sockaddr(skb, &sa);
+ if (pn_sockaddr_get_addr(&sa) == 0)
+ goto out; /* currently, we cannot be device 0 */
+
+ /* TODO: put packets to sockets backlog */
+
+out:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static struct packet_type phonet_packet_type = {
+ .type = __constant_htons(ETH_P_PHONET),
+ .dev = NULL,
+ .func = phonet_rcv,
+};
+
+/* Transport protocol registration */
+static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
+static DEFINE_SPINLOCK(proto_tab_lock);
+
+int __init_or_module phonet_proto_register(int protocol,
+ struct phonet_protocol *pp)
+{
+ int err = 0;
+
+ if (protocol >= PHONET_NPROTO)
+ return -EINVAL;
+
+ err = proto_register(pp->prot, 1);
+ if (err)
+ return err;
+
+ spin_lock(&proto_tab_lock);
+ if (proto_tab[protocol])
+ err = -EBUSY;
+ else
+ proto_tab[protocol] = pp;
+ spin_unlock(&proto_tab_lock);
+
+ return err;
+}
+EXPORT_SYMBOL(phonet_proto_register);
+
+void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
+{
+ spin_lock(&proto_tab_lock);
+ BUG_ON(proto_tab[protocol] != pp);
+ proto_tab[protocol] = NULL;
+ spin_unlock(&proto_tab_lock);
+ proto_unregister(pp->prot);
+}
+EXPORT_SYMBOL(phonet_proto_unregister);
+
+static struct phonet_protocol *phonet_proto_get(int protocol)
+{
+ struct phonet_protocol *pp;
+
+ if (protocol >= PHONET_NPROTO)
+ return NULL;
+
+ spin_lock(&proto_tab_lock);
+ pp = proto_tab[protocol];
+ if (pp && !try_module_get(pp->prot->owner))
+ pp = NULL;
+ spin_unlock(&proto_tab_lock);
+
+ return pp;
+}
+
+static inline void phonet_proto_put(struct phonet_protocol *pp)
+{
+ module_put(pp->prot->owner);
+}
+
+/* Module registration */
+static int __init phonet_init(void)
+{
+ int err;
+
+ err = sock_register(&phonet_proto_family);
+ if (err) {
+ printk(KERN_ALERT
+ "phonet protocol family initialization failed\n");
+ return err;
+ }
+
+ dev_add_pack(&phonet_packet_type);
+ return 0;
+}
+
+static void __exit phonet_exit(void)
+{
+ sock_unregister(AF_PHONET);
+ dev_remove_pack(&phonet_packet_type);
+}
+
+module_init(phonet_init);
+module_exit(phonet_exit);
+MODULE_DESCRIPTION("Phonet protocol stack for Linux");
+MODULE_LICENSE("GPL");