uint_32 IP_route_local
(
RTCSPCB_PTR pcb,
/* [IN] the packet to send */
_ip_address ipdest
/* [IN] the ultimate destination */
)
{ /* Body */
IP_CFG_STRUCT_PTR IP_cfg_ptr = RTCS_getcfg(IP);
struct ip_route_local_test testdata;
/*
** RFC 2131 says:
** "In the case of a client using DHCP for initial configuration (before
** the client's TCP/IP software has been completely configured), DHCP
** requires creative use of the client's TCP/IP software and liberal
** interpretation of RFC 1122. The TCP/IP software SHOULD accept and
** forward to the IP layer any IP packets delivered to the client's
** hardware address before the IP address is configured."
**
** So if the broadcast flag is disabled, we check, and if the packet's
** source interface is not bound, we send the packet to IF_LOCALHOST.
** This is paired with the same test in ip.c:IP_service(), which sends
** the packet here.
*/
if ((ipdest == INADDR_BROADCAST)
|| IN_MULTICAST(ipdest)
|| (!_DHCP_broadcast && (IP_get_ipif_addr(pcb->IFSRC) == INADDR_ANY))) {
/* Accept broadcasts and multicasts and unbound unicasts */
testdata.ifdest = IP_cfg_ptr->IF_LOCALHOST;
} else {
/* If unicast, check routing table */
testdata.ifdest = NULL;
testdata.ipdest = ipdest;
testdata.pcb = pcb;
IPRADIX_findbest(&IP_cfg_ptr->ROUTE_ROOT.NODE, ipdest,
IP_route_local_test, &testdata);
} /* Endif */
/* Send the packet to the interface. */
if (testdata.ifdest) {
return IP_send_dgram(IP_cfg_ptr->IF_LOCALHOST, pcb, 0, ipdest, ipdest, 0,
NULL);
} /* Endif */
/* No interface was found. Discard the packet */
IF_IP_STATS_ENABLED(IP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_IP_STATS_ENABLED(IP_cfg_ptr->STATS.ST_RX_ADDR_ERRORS++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_IP_UNREACH);
RTCSPCB_free(pcb);
return RTCSERR_IP_UNREACH;
} /* Endbody */
static boolean NAT_IPREASM_expire
(
TCPIP_EVENT_PTR event /* [IN/OUT] the expire event */
)
{ /* Body */
IP_CFG_STRUCT_PTR IP_cfg_ptr = RTCS_getcfg(IP);
IP_DGRAM_PTR dgram = event->PRIVATE;
IF_IP_STATS_ENABLED(IP_cfg_ptr->STATS.ST_RX_FRAG_DISCARDED++);
/* Send a ICMP Time Exceeded */
if (dgram->DIRECT[0]
&& dgram->DIRECT[0]->BUSYINT & 1
&& dgram->TYPE & RTCSPCB_TYPE_UNICAST) {
ICMP_send_error_internal(ICMPTYPE_TIMEEXCEED, ICMPCODE_TE_REASM, 0,
&dgram->IPH, NULL, 0);
} /* Endif */
NAT_IPREASM_del_dgram(dgram);
return FALSE;
} /* Endbody */