Phonet: Phonet datagram transport protocol

This provides the basic SOCK_DGRAM transport protocol for Phonet.

Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 106 insertions, 0 deletions

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index ba54d53020ff..e6771d3961cf 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -99,6 +99,101 @@ static struct net_proto_family phonet_proto_family = {
         .owner = THIS_MODULE,
 };
 
+/*
+ * Prepends an ISI header and sends a datagram.
+ */
+static int pn_send(struct sk_buff *skb, struct net_device *dev,
+                        u16 dst, u16 src, u8 res)
+{
+        struct phonethdr *ph;
+        int err;
+
+        if (skb->len + 2 > 0xffff) {
+                /* Phonet length field would overflow */
+                err = -EMSGSIZE;
+                goto drop;
+        }
+
+        skb_reset_transport_header(skb);
+        WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
+        skb_push(skb, sizeof(struct phonethdr));
+        skb_reset_network_header(skb);
+        ph = pn_hdr(skb);
+        ph->pn_rdev = pn_dev(dst);
+        ph->pn_sdev = pn_dev(src);
+        ph->pn_res = res;
+        ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
+        ph->pn_robj = pn_obj(dst);
+        ph->pn_sobj = pn_obj(src);
+
+        skb->protocol = htons(ETH_P_PHONET);
+        skb->priority = 0;
+        skb->dev = dev;
+
+        if (pn_addr(src) == pn_addr(dst)) {
+                skb_reset_mac_header(skb);
+                skb->pkt_type = PACKET_LOOPBACK;
+                skb_orphan(skb);
+                netif_rx_ni(skb);
+                err = 0;
+        } else {
+                err = dev_hard_header(skb, dev, ntohs(skb->protocol),
+                                        NULL, NULL, skb->len);
+                if (err < 0) {
+                        err = -EHOSTUNREACH;
+                        goto drop;
+                }
+                err = dev_queue_xmit(skb);
+        }
+
+        return err;
+drop:
+        kfree_skb(skb);
+        return err;
+}
+
+/*
+ * Create a Phonet header for the skb and send it out. Returns
+ * non-zero error code if failed. The skb is freed then.
+ */
+int pn_skb_send(struct sock *sk, struct sk_buff *skb,
+                const struct sockaddr_pn *target)
+{
+        struct net_device *dev;
+        struct pn_sock *pn = pn_sk(sk);
+        int err;
+        u16 src;
+        u8 daddr = pn_sockaddr_get_addr(target), saddr = PN_NO_ADDR;
+
+        err = -EHOSTUNREACH;
+        if (sk->sk_bound_dev_if)
+                dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
+        else
+                dev = phonet_device_get(sock_net(sk));
+        if (!dev || !(dev->flags & IFF_UP))
+                goto drop;
+
+        saddr = phonet_address_get(dev, daddr);
+        if (saddr == PN_NO_ADDR)
+                goto drop;
+
+        src = pn->sobject;
+        if (!pn_addr(src))
+                src = pn_object(saddr, pn_obj(src));
+
+        err = pn_send(skb, dev, pn_sockaddr_get_object(target),
+                        src, pn_sockaddr_get_resource(target));
+        dev_put(dev);
+        return err;
+
+drop:
+        kfree_skb(skb);
+        if (dev)
+                dev_put(dev);
+        return err;
+}
+EXPORT_SYMBOL(pn_skb_send);
+
 /* packet type functions */
 
 /*
@@ -226,11 +321,22 @@ static int __init phonet_init(void)
         phonet_device_init();
         dev_add_pack(&phonet_packet_type);
         phonet_netlink_register();
+
+        err = isi_register();
+        if (err)
+                goto err;
         return 0;
+
+err:
+        sock_unregister(AF_PHONET);
+        dev_remove_pack(&phonet_packet_type);
+        phonet_device_exit();
+        return err;
 }
 
 static void __exit phonet_exit(void)
 {
+        isi_unregister();
         sock_unregister(AF_PHONET);
         dev_remove_pack(&phonet_packet_type);
         phonet_device_exit();