struct uip_conn *uip_tcpactive(struct uip_tcpip_hdr *buf)
{
struct uip_conn *conn = (struct uip_conn *)g_active_tcp_connections.head;
in_addr_t srcipaddr = uip_ip4addr_conv(buf->srcipaddr);
while (conn)
{
/* Find an open connection matching the tcp input */
if (conn->tcpstateflags != UIP_CLOSED &&
buf->destport == conn->lport && buf->srcport == conn->rport &&
uip_ipaddr_cmp(srcipaddr, conn->ripaddr))
{
/* Matching connection found.. break out of the loop and return a
* reference to it.
*/
break;
}
/* Look at the next active connection */
conn = (struct uip_conn *)conn->node.flink;
}
return conn;
}
struct uip_conn *uip_tcpaccept(struct uip_tcpip_hdr *buf)
{
struct uip_conn *conn = uip_tcpalloc();
if (conn)
{
/* Fill in the necessary fields for the new connection. */
conn->rto = UIP_RTO;
conn->timer = UIP_RTO;
conn->sa = 0;
conn->sv = 4;
conn->nrtx = 0;
conn->lport = buf->destport;
conn->rport = buf->srcport;
conn->mss = UIP_TCP_INITIAL_MSS;
uip_ipaddr_copy(conn->ripaddr, uip_ip4addr_conv(buf->srcipaddr));
conn->tcpstateflags = UIP_SYN_RCVD;
uip_tcpinitsequence(conn->sndseq);
conn->unacked = 1;
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
conn->expired = 0;
conn->isn = 0;
conn->sent = 0;
#endif
/* rcvseq should be the seqno from the incoming packet + 1. */
memcpy(conn->rcvseq, buf->seqno, 4);
#ifdef CONFIG_NET_TCP_READAHEAD
/* Initialize the list of TCP read-ahead buffers */
sq_init(&conn->readahead);
#endif
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
/* Initialize the write buffer lists */
sq_init(&conn->write_q);
sq_init(&conn->unacked_q);
#endif
/* And, finally, put the connection structure into the active list.
* Interrupts should already be disabled in this context.
*/
dq_addlast(&conn->node, &g_active_tcp_connections);
}
return conn;
}
static inline void recvfrom_udpsender(struct uip_driver_s *dev, struct recvfrom_s *pstate)
{
#ifdef CONFIG_NET_IPv6
FAR struct sockaddr_in6 *infrom = pstate->rf_from;
#else
FAR struct sockaddr_in *infrom = pstate->rf_from;
#endif
if (infrom)
{
infrom->sin_family = AF_INET;
infrom->sin_port = UDPBUF->srcport;
#ifdef CONFIG_NET_IPv6
uip_ipaddr_copy(infrom->sin6_addr.s6_addr, UDPBUF->srcipaddr);
#else
uip_ipaddr_copy(infrom->sin_addr.s_addr, uip_ip4addr_conv(UDPBUF->srcipaddr));
#endif
}
}
void arp_update(uint16_t *pipaddr, uint8_t *ethaddr)
{
struct arp_entry *tabptr = NULL;
in_addr_t ipaddr = uip_ip4addr_conv(pipaddr);
int i;
/* Walk through the ARP mapping table and try to find an entry to
* update. If none is found, the IP -> MAC address mapping is
* inserted in the ARP table.
*/
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
/* Only check those entries that are actually in use. */
if (tabptr->at_ipaddr != 0)
{
/* Check if the source IP address of the incoming packet matches
* the IP address in this ARP table entry.
*/
if (uip_ipaddr_cmp(ipaddr, tabptr->at_ipaddr))
{
/* An old entry found, update this and return. */
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
return;
}
}
}
/* If we get here, no existing ARP table entry was found, so we create one. */
/* First, we try to find an unused entry in the ARP table. */
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (tabptr->at_ipaddr == 0)
{
break;
}
}
/* If no unused entry is found, we try to find the oldest entry and
* throw it away.
*/
if (i == CONFIG_NET_ARPTAB_SIZE)
{
uint8_t tmpage = 0;
int j = 0;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (g_arptime - tabptr->at_time > tmpage)
{
tmpage = g_arptime - tabptr->at_time;
j = i;
}
}
i = j;
tabptr = &g_arptable[i];
}
/* Now, i is the ARP table entry which we will fill with the new
* information.
*/
tabptr->at_ipaddr = ipaddr;
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
}
