/*
* 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, u8 irq)
{
struct phonethdr *ph;
int err;
if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
skb->len + sizeof(struct phonethdr) > dev->mtu) {
err = -EMSGSIZE;
goto drop;
}
/* Broadcast sending is not implemented */
if (pn_addr(dst) == PNADDR_BROADCAST) {
err = -EOPNOTSUPP;
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);
if (irq)
netif_rx(skb);
else
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 *net = sock_net(sk);
struct net_device *dev;
struct pn_sock *pn = pn_sk(sk);
int err;
u16 src, dst;
u8 daddr, saddr, res;
src = pn->sobject;
if (target != NULL) {
dst = pn_sockaddr_get_object(target);
res = pn_sockaddr_get_resource(target);
} else {
dst = pn->dobject;
res = pn->resource;
}
daddr = pn_addr(dst);
err = -EHOSTUNREACH;
if (sk->sk_bound_dev_if)
dev = dev_get_by_index(net, sk->sk_bound_dev_if);
else if (phonet_address_lookup(net, daddr) == 0) {
dev = phonet_device_get(net);
skb->pkt_type = PACKET_LOOPBACK;
} else if (dst == 0) {
/* Resource routing (small race until phonet_rcv()) */
struct sock *sk = pn_find_sock_by_res(net, res);
if (sk) {
sock_put(sk);
dev = phonet_device_get(net);
skb->pkt_type = PACKET_LOOPBACK;
} else
dev = phonet_route_output(net, daddr);
} else
dev = phonet_route_output(net, daddr);
if (!dev || !(dev->flags & IFF_UP))
goto drop;
saddr = phonet_address_get(dev, daddr);
if (saddr == PN_NO_ADDR)
goto drop;
if (!pn_addr(src))
src = pn_object(saddr, pn_obj(src));
err = pn_send(skb, dev, dst, src, res, 0);
dev_put(dev);
return err;
drop:
printk(KERN_DEBUG "pn_skb_send DROP\n");
kfree_skb(skb);
if (dev)
dev_put(dev);
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 *net = sock_net(sk);
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(net, sk->sk_bound_dev_if);
else if (phonet_address_lookup(net, daddr) == 0) {
dev = phonet_device_get(net);
skb->pkt_type = PACKET_LOOPBACK;
} else
dev = phonet_route_output(net, daddr);
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), 0);
dev_put(dev);
return err;
drop:
kfree_skb(skb);
if (dev)
dev_put(dev);
return err;
}
/*
* 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, u8 irq)
{
struct phonethdr *ph;
int err, i;
if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
skb->len + sizeof(struct phonethdr) > dev->mtu) {
err = -EMSGSIZE;
goto drop;
}
/* Broadcast sending is not implemented */
if (pn_addr(dst) == PNADDR_BROADCAST) {
err = -EOPNOTSUPP;
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;
PN_PRINTK("pn_send rdev %x sdev %x res %x robj %x sobj %x netdev=%s\n",
ph->pn_rdev, ph->pn_sdev, ph->pn_res,
ph->pn_robj, ph->pn_sobj, dev->name);
PN_DATA_PRINTK("PHONET : skb data = %d\nPHONET :", skb->len);
for (i = 1; i <= skb->len; i++) {
PN_DATA_PRINTK(" %02x", skb->data[i-1]);
if ((i%8) == 0)
PN_DATA_PRINTK("\n");
}
if (skb->pkt_type == PACKET_LOOPBACK) {
skb_reset_mac_header(skb);
skb_orphan(skb);
err = (irq ? netif_rx(skb) : netif_rx_ni(skb)) ? -ENOBUFS : 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);
if (unlikely(err > 0))
err = net_xmit_errno(err);
}
return err;
drop:
printk(KERN_DEBUG "pn_send DROP\n");
kfree_skb(skb);
return err;
}
