static uint16_t arp_send_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvconn,
FAR void *priv, uint16_t flags)
{
FAR struct arp_send_s *state = (FAR struct arp_send_s *)priv;
ninfo("flags: %04x sent: %d\n", flags, state->snd_sent);
if (state)
{
/* Check if the network is still up */
if ((flags & NETDEV_DOWN) != 0)
{
nerr("ERROR: Interface is down\n");
arp_send_terminate(state, -ENETUNREACH);
return flags;
}
/* Check if the outgoing packet is available. It may have been claimed
* by a send event handler serving a different thread -OR- if the
* output buffer currently contains unprocessed incoming data. In
* these cases we will just have to wait for the next polling cycle.
*/
if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
{
/* Another thread has beat us sending data or the buffer is busy,
* Check for a timeout. If not timed out, wait for the next
* polling cycle and check again.
*/
/* REVISIT: No timeout. Just wait for the next polling cycle */
return flags;
}
/* It looks like we are good to send the data */
/* Copy the packet data into the device packet buffer and send it */
arp_format(dev, state->snd_ipaddr);
/* Make sure no ARP request overwrites this ARP request. This
* flag will be cleared in arp_out().
*/
IFF_SET_NOARP(dev->d_flags);
/* Don't allow any further call backs. */
arp_send_terminate(state, OK);
}
return flags;
}
void arp_out(FAR struct net_driver_s *dev)
{
struct ether_addr ethaddr;
FAR struct eth_hdr_s *peth = ETHBUF;
FAR struct arp_iphdr_s *pip = IPBUF;
in_addr_t ipaddr;
in_addr_t destipaddr;
int ret;
#if defined(CONFIG_NET_PKT) || defined(CONFIG_NET_ARP_SEND)
/* Skip sending ARP requests when the frame to be transmitted was
* written into a packet socket.
*/
if (IFF_IS_NOARP(dev->d_flags))
{
/* Clear the indication and let the packet continue on its way. */
IFF_CLR_NOARP(dev->d_flags);
return;
}
#endif
/* Find the destination IP address in the ARP table and construct
* the Ethernet header. If the destination IP address isn't on the
* local network, we use the default router's IP address instead.
*
* If not ARP table entry is found, we overwrite the original IP
* packet with an ARP request for the IP address.
*/
/* First check if destination is a local broadcast. */
if (net_ipv4addr_hdrcmp(pip->eh_destipaddr, g_broadcast_ipaddr))
{
memcpy(peth->dest, g_broadcast_ethaddr.ether_addr_octet, ETHER_ADDR_LEN);
goto finish_header;
}
#ifdef CONFIG_NET_IGMP
/* Check if the destination address is a multicast address
*
* - IPv4: multicast addresses lie in the class D group -- The address range
* 224.0.0.0 to 239.255.255.255 (224.0.0.0/4)
*
* - IPv6 multicast addresses are have the high-order octet of the
* addresses=0xff (ff00::/8.)
*/
if (NTOHS(pip->eh_destipaddr[0]) >= 0xe000 &&
NTOHS(pip->eh_destipaddr[0]) <= 0xefff)
{
/* Build the well-known IPv4 IGMP Ethernet address. The first
* three bytes are fixed; the final three variable come from the
* last three bytes of the IPv4 address (network order).
*
* Address range : 01:00:5e:00:00:00 to 01:00:5e:7f:ff:ff
*/
FAR const uint8_t *ip = (FAR uint8_t *)pip->eh_destipaddr;
peth->dest[0] = g_multicast_ethaddr[0];
peth->dest[1] = g_multicast_ethaddr[1];
peth->dest[2] = g_multicast_ethaddr[2];
peth->dest[3] = ip[1] & 0x7f;
peth->dest[4] = ip[2];
peth->dest[5] = ip[3];
goto finish_header;
}
#endif
/* Check if the destination address is on the local network. */
destipaddr = net_ip4addr_conv32(pip->eh_destipaddr);
if (!net_ipv4addr_maskcmp(destipaddr, dev->d_ipaddr, dev->d_netmask))
{
/* Destination address is not on the local network */
#ifdef CONFIG_NET_ROUTE
/* We have a routing table.. find the correct router to use in
* this case (or, as a fall-back, use the device's default router
* address). We will use the router IP address instead of the
* destination address when determining the MAC address.
*/
netdev_ipv4_router(dev, destipaddr, &ipaddr);
#else
/* Use the device's default router IP address instead of the
* destination address when determining the MAC address.
*/
net_ipv4addr_copy(ipaddr, dev->d_draddr);
#endif
}
/* The destination address is on the local network. Check if it is
* the sub-net broadcast address.
*/
else if (net_ipv4addr_broadcast(destipaddr, dev->d_netmask))
{
/* Yes.. then we won't need to know the destination MAC address */
memcpy(peth->dest, g_broadcast_ethaddr.ether_addr_octet, ETHER_ADDR_LEN);
goto finish_header;
}
else
{
/* Else, we use the destination IP address. */
net_ipv4addr_copy(ipaddr, destipaddr);
}
/* Check if we already have this destination address in the ARP table */
ret = arp_find(ipaddr, ðaddr);
if (ret < 0)
{
ninfo("ARP request for IP %08lx\n", (unsigned long)ipaddr);
/* The destination address was not in our ARP table, so we overwrite
* the IP packet with an ARP request.
*/
arp_format(dev, ipaddr);
arp_dump(ARPBUF);
return;
}
/* Build an Ethernet header. */
memcpy(peth->dest, ethaddr.ether_addr_octet, ETHER_ADDR_LEN);
/* Finish populating the Ethernet header */
finish_header:
memcpy(peth->src, dev->d_mac.ether.ether_addr_octet, ETHER_ADDR_LEN);
peth->type = HTONS(ETHTYPE_IP);
dev->d_len += ETH_HDRLEN;
}
static uint16_t arp_send_interrupt(FAR struct net_driver_s *dev,
FAR void *pvconn,
FAR void *priv, uint16_t flags)
{
FAR struct arp_send_s *state = (FAR struct arp_send_s *)priv;
nllvdbg("flags: %04x sent: %d\n", flags, state->snd_sent);
if (state)
{
#ifdef CONFIG_NETDEV_MULTINIC
/* Is this the device that we need to route this request? */
if (strncmp((FAR const char *)dev->d_ifname, (FAR const char *)state->snd_ifname, IFNAMSIZ) != 0)
{
/* No... pass on this one and wait for the device that we want */
return flags;
}
#endif
/* Check if the outgoing packet is available. It may have been claimed
* by a send interrupt serving a different thread -OR- if the output
* buffer currently contains unprocessed incoming data. In these cases
* we will just have to wait for the next polling cycle.
*/
if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
{
/* Another thread has beat us sending data or the buffer is busy,
* Check for a timeout. If not timed out, wait for the next
* polling cycle and check again.
*/
/* REVISIT: No timeout. Just wait for the next polling cycle */
return flags;
}
/* It looks like we are good to send the data */
/* Copy the packet data into the device packet buffer and send it */
arp_format(dev, state->snd_ipaddr);
/* Make sure no ARP request overwrites this ARP request. This
* flag will be cleared in arp_out().
*/
IFF_SET_NOARP(dev->d_flags);
/* Don't allow any further call backs. */
state->snd_sent = true;
state->snd_cb->flags = 0;
state->snd_cb->priv = NULL;
state->snd_cb->event = NULL;
/* Wake up the waiting thread */
sem_post(&state->snd_sem);
}
return flags;
}
