void RIP_service(
RTCSPCB_PTR pcb, /* [IN/OUT] incoming packet */
UCB_STRUCT_PTR ucb_ptr /* [IN] target UCB */
)
{ /* Body */
RIP_HEADER_PTR hd = (RIP_HEADER_PTR)RTCSPCB_DATA(pcb);
/* check the version number */
if (mqx_ntohc(hd->VERSION) != RIP_V1 && mqx_ntohc(hd->VERSION) != RIP_V2) {
RTCSLOG_PCB_FREE(pcb, RTCS_OK);
RTCSPCB_free(pcb);
} /* Endif */
RTCSLOG_PCB_READ(pcb, RTCS_LOGCTRL_PORT(IPPORT_RIP), mqx_ntohc(hd->VERSION));
switch (mqx_ntohc(hd->COMMAND)) {
case RIPCMD_REQUEST:
RIP_process_inreq(pcb);
break;
case RIPCMD_RESPONSE:
RIP_process_inresp(pcb);
break;
default:
break;
} /* Endswitch */
RTCSLOG_PCB_FREE(pcb, RTCS_OK);
RTCSPCB_free(pcb);
} /* Endbody */
static void IGMP_service
(
RTCSPCB_PTR pcb, /* [IN/OUT] incoming packet */
void *dummy /* [IN] not used */
)
{ /* Body */
IGMP_HEADER_PTR header;
IGMP_CFG_STRUCT_PTR IGMP_cfg_ptr;
IGMP_cfg_ptr = RTCS_getcfg(IGMP);
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_RX_TOTAL++);
header = (IGMP_HEADER_PTR)RTCSPCB_DATA(pcb);
/* check if length >= sizeof(IGMP_HEADER) */
if (RTCSPCB_SIZE(pcb) < sizeof(IGMP_HEADER)) {
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_RX_SMALL_DGRAM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_IGMP_BAD_HEADER);
RTCSPCB_free(pcb);
return;
} /* Endif */
/* Verify the checksum */
if (IP_Sum_PCB(0, pcb) != 0xFFFF) {
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_RX_BAD_CHECKSUM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_IGMP_BAD_CHECKSUM);
RTCSPCB_free(pcb);
return;
} /* Endif */
if (mqx_ntohc(header->TYPE) == IGMPTYPE_V2_REPORT) {
RTCSLOG_PCB_READ(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_IGMP), 2);
} else {
RTCSLOG_PCB_READ(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_IGMP), 1);
} /* Endif */
switch (mqx_ntohc(header->TYPE)) {
case IGMPTYPE_QUERY:
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_RX_QUERY++);
IGMP_rcv_query(pcb->IFSRC, mqx_ntohl(header->GROUP_ADDRESS), mqx_ntohc(header->MAX_RESP_TIME));
break;
case IGMPTYPE_V1_REPORT:
case IGMPTYPE_V2_REPORT:
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_RX_REPORT++);
IGMP_rcv_report(pcb->IFSRC, mqx_ntohl(header->GROUP_ADDRESS));
break;
default:
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_RX_BAD_TYPE++);
} /* Endswitch */
RTCSLOG_PCB_FREE(pcb, RTCS_OK);
RTCSPCB_free(pcb);
} /* Endbody */
unsigned char *DHCP_find_option
(
unsigned char *msgptr,
uint32_t msglen,
unsigned char option
)
{ /* Body */
unsigned char optype;
unsigned char oplen;
for (;;) {
/* Get the next option code */
if (msglen == 0) {
return NULL;
} /* Endif */
optype = mqx_ntohc(msgptr);
msgptr++;
msglen--;
if (optype == DHCPOPT_END) {
return NULL;
} /* Endif */
if (optype == DHCPOPT_PAD) {
continue;
} /* Endif */
/* Get the option length */
if (msglen == 0) {
return NULL;
} /* Endif */
oplen = mqx_ntohc(msgptr);
msgptr++;
msglen--;
if (msglen < oplen) {
return NULL;
} /* Endif */
if (optype == option) {
return msgptr-2;
} /* Endif */
msgptr += oplen;
msglen -= oplen;
} /* Endfor */
} /* Endbody */
void NAT_ALG_TCP_checksum
(
IP_HEADER_PTR ip_header_ptr /* [IN] pointer to IP header */
)
{ /* Body */
TRANSPORT_UNION transport;
uint16_t checksum;
uint16_t protocol;
uint16_t iplen = IPH_LEN(ip_header_ptr);
uint16_t len = mqx_ntohs(ip_header_ptr->LENGTH) - iplen;
/* Get TCP header */
transport.PTR = TRANSPORT_PTR(ip_header_ptr);
mqx_htons(transport.TCP_PTR->checksum, 0); /* Clear checksum field */
protocol = mqx_ntohc(ip_header_ptr->PROTOCOL); /* PROTOCOL */
checksum = (uint16_t) _mem_sum_ip(protocol, 8, ip_header_ptr->SOURCE); /* IP SRC and DST ADDR */
checksum = (uint16_t) _mem_sum_ip(checksum, len, transport.PTR);
/* TCP LENGTH */
checksum = IP_Sum_immediate(checksum, len);
checksum = IP_Sum_invert(checksum);
mqx_htons(transport.TCP_PTR->checksum, checksum);
} /* Endbody */
static unsigned char *DNS_parse_answer_name_to_dotted_form
(
unsigned char *buffer_ptr,
unsigned char *name,
uint32_t loc
)
{ /* Body */
unsigned char *compressed_name;
unsigned char *fill_ptr;
unsigned char label_size;
uint32_t i;
uint16_t new_location;
fill_ptr = RTCS_HOST_NAMES[loc];
_mem_zero(fill_ptr, DNS_MAX_CHARS_IN_NAME);
compressed_name = name;
while ( mqx_ntohc(compressed_name) != '\0' ) {
if ( mqx_ntohc(compressed_name) & DNS_COMPRESSED_NAME_MASK ) {
new_location = mqx_ntohs(compressed_name)
& DNS_COMPRESSED_LOCATION_MASK;
compressed_name = buffer_ptr + new_location;
}/* Endif */
label_size = mqx_ntohc(compressed_name);
compressed_name++;
for ( i = 0; i < label_size; i++ ) {
*fill_ptr++ = mqx_ntohc(compressed_name);
compressed_name++;
} /* Endfor */
if ( mqx_ntohc(compressed_name) != '\0' ) {
*fill_ptr++ = '.';
}/* Endif */
} /* Endwhile */
*fill_ptr = '\0';
return( RTCS_HOST_NAMES[loc] );
} /* Endbody */
static uint32_t RIP_send_pkt(
IP_IF_PTR ipif, /* [IN] the outgoing interface */
_ip_address ipdst, /* [IN] the destination ip */
uint16_t portdst,/* [IN] the destination port */
unsigned char *data, /* [IN] the data to send */
uint32_t len /* [IN] the length of data to send */
)
{ /* Body */
RTCSPCB_PTR pcb;
RIP_CFG_STRUCT_PTR ripcfg = RTCS_getcfg(RIP);
RIP_HEADER_PTR hd = (RIP_HEADER_PTR)data;
uint32_t err;
_ip_address ipsrc = IP_get_ipif_addr(ipif);
if (ipsrc == INADDR_ANY) {
_mem_free(data);
return RTCS_OK;
} /* Endif */
/* Allocate a PCB */
pcb = RTCSPCB_alloc_send();
if (pcb == NULL) {
_mem_free(data);
return RTCSERR_PCB_ALLOC;
} /* Endif */
//RTCSLOG_PCB_ALLOC(pcb);
/* add my data in the pcb */
err = RTCSPCB_append_fragment_autofree(pcb, len, data);
if (err) {
_mem_free(data);
RTCSLOG_PCB_FREE(pcb, err);
RTCSPCB_free(pcb);
return err;
} /* Endif */
RTCSLOG_PCB_WRITE(pcb, RTCS_LOGCTRL_PORT(IPPORT_RIP), mqx_ntohc(hd->VERSION));
/* dont advertize in limited broadcast but in ip broadcast */
if (ipdst == INADDR_BROADCAST){
_ip_address netmask;
ipdst = IP_get_ipif_addr(ipif); /* Get IP address of interface */
IP_get_netmask(ipif, ipdst, &netmask); /* Get netmask */
ipdst = ipdst | ~netmask;
} /* Endif */
/* send it */
/* use a flag to prevent the broadcast/multicast packet from
** looping back to us.
*/
return UDP_send_internal(ripcfg->UCB, ipsrc, ipdst, portdst, pcb, RTCS_MSG_NOLOOP);
} /* Endbody */
static void IPREASM_add_frag
(
IP_DGRAM_PTR dgram, /* [IN] the dgram */
RTCSPCB_PTR inpcb /* [IN] the received PCB */
)
{ /* Body */
IP_HEADER_PTR iph = (IP_HEADER_PTR)RTCSPCB_DATA(inpcb);
uint32_t iphlen = (mqx_ntohc(iph->VERSLEN) & 0xF) << 2;
uint32_t totlen = mqx_ntohs(iph->LENGTH);
int32_t offset = mqx_ntohs(iph->FRAGMENT);
int32_t first = (offset & IP_FRAG_MASK) << IP_FRAG_SHIFT;
uint32_t datalen = totlen - iphlen;
unsigned char *data = (unsigned char *)iph + iphlen;
IPREASM_BLK_PTR blk;
uint32_t len;
if (offset & IP_FRAG_MF) {
/* Fragments (except the last) must be multiples of 8 bytes */
if ((datalen & 0x07) != 0) {
return;
} /* Endif */
} else {
/* If this fragment is the last one, record the total length */
dgram->TOTLEN = first + datalen;
} /* Endif */
/* Once we get the first fragment, record the IP header and 8 data bytes */
if (first == 0) {
_mem_copy(iph, &dgram->header.IP4.IPH, iphlen + 8);
dgram->TYPE = inpcb->TYPE;
dgram->IFSRC = inpcb->IFSRC;
dgram->LINKOPT = inpcb->LINK_OPTIONS.RX;
} /* Endif */
while (datalen) {
blk = IPREASM_blk_get(dgram, first);
if (!blk) {
return;
} /* Endif */
len = IPREASM_blk_write(dgram, blk, first, data, datalen);
first += len;
data += len;
datalen -= len;
} /* Endwhile */
} /* Endbody */
static void RIP_adopt_rt(
RTCSPCB_PTR pcb, /* [IN] incoming packet */
IP_ROUTE_INDIRECT_PTR gate,
RIP_ENTRY_PTR rte,
uint32_t metric,
_ip_address *network_ptr,
_ip_address *netmask_ptr
)
{ /* Body */
RIP_HEADER_PTR hd = (RIP_HEADER_PTR)RTCSPCB_DATA(pcb);
uint16_t rip_vers = mqx_ntohc(hd->VERSION);
_ip_address ipsrc = IP_source(pcb);
/* init the common part */
*network_ptr = mqx_ntohl(rte->NETADDR);
gate->GATEWAY = ipsrc;
if (rip_vers == RIP_V2){
_ip_address nexthop = mqx_ntohl(rte->NEXTHOP);
*netmask_ptr = mqx_ntohl(rte->NETMASK);
/* incoming nexthop. rfc2453.4.4 */
if (nexthop && IP_is_direct(pcb->IFSRC, nexthop))
gate->GATEWAY = nexthop;
}else{
*netmask_ptr = IN_DEFAULT_NET(*network_ptr);
}
/* if the metric is >= than the RIP_MAX_METRIC, the ourte is down */
if (metric < RIP_MAX_METRIC) {
gate->FLAGS |= RTF_UP;
} else {
gate->FLAGS &= ~RTF_UP;
} /* Endif */
/* init the RIP part */
gate->RIP.METRIC = metric;
gate->RIP.RT_TAG = mqx_ntohs(rte->RT_TAG);
gate->RIP.CHANGED_F = TRUE;
gate->RIP.IPIFSRC = pcb->IFSRC;
RIP_init_timer(gate, gate->RIP.METRIC);
} /* Endbody */
uint32_t IP_reasm
(
RTCSPCB_PTR pcb, /* [IN] the packet to deliver */
RTCSPCB_PTR *outpcb /* [OUT] the reassembled packet or NULL */
)
{ /* Body */
IP_HEADER_PTR iph = (IP_HEADER_PTR)RTCSPCB_DATA(pcb);
_ip_address ipsrc = mqx_ntohl(iph->SOURCE);
_ip_address ipdst = mqx_ntohl(iph->DEST);
uint8_t proto = mqx_ntohc(iph->PROTOCOL);
uint16_t id = mqx_ntohs(iph->ID);
IP_DGRAM_PTR dgram;
*outpcb = NULL;
dgram = IPREASM_get_dgram(ipsrc, ipdst, proto, id);
if (!dgram) {
RTCSLOG_PCB_FREE(pcb, RTCSERR_OUT_OF_MEMORY);
RTCSPCB_free(pcb);
return RTCSERR_OUT_OF_MEMORY;
} /* Endif */
IPREASM_add_frag(dgram, pcb);
/*
** We're done when:
** 0 < TOTLEN = MAXLEN <= CURLEN
**
** Note: we can get TOTLEN < CURLEN because CURLEN is
** always a multiple of eight, but TOTLEN may not be.
*/
if (dgram->TOTLEN > 0
&& dgram->MAXLEN == dgram->TOTLEN
&& dgram->CURLEN >= dgram->MAXLEN) {
*outpcb = IPREASM_reasm_dgram(dgram);
} /* Endif */
/* Free the old pcb */
RTCSLOG_PCB_FREE(pcb, RTCS_OK);
RTCSPCB_free(pcb);
return RTCS_OK;
} /* Endbody */
static bool SNTP_valid_header
(
SNTP_HEADER_PTR header_ptr
/*[IN] pointer to a SNTP header struct */
)
{
uint32_t t2[2];
uint32_t t3[2];
bool result;
t2[0] = mqx_ntohl(header_ptr->RECEIVE_TIMESTAMP1);
t2[1] = mqx_ntohl(header_ptr->RECEIVE_TIMESTAMP2);
t3[0] = mqx_ntohl(header_ptr->TRANSMIT_TIMESTAMP1);
t3[1] = mqx_ntohl(header_ptr->TRANSMIT_TIMESTAMP2);
/* Reply shoud be in server mode */
/* Version should be same as in original message */
/* LI field should be between 0 and 2 */
/* Stratum should be between 1 and 14 */
/* Originate timestamp must be non zero */
/* Receive timestamp must be non zero */
/* Transmit timestamp must be non-zero */
if(
((mqx_ntohc(header_ptr->LI_VN_MODE) & SNTP_MASK_MODE) == SNTP_MODE_SERVER) &&
((mqx_ntohc(header_ptr->LI_VN_MODE) & SNTP_MASK_VN) >> 3 >= SNTP_VER_MIN) &&
((mqx_ntohc(header_ptr->LI_VN_MODE) & SNTP_MASK_LI) >> 6 != SNTP_LI_ALARM) &&
( mqx_ntohc(header_ptr->STRATUM) >= SNTP_STRATUM_MIN) &&
( mqx_ntohc(header_ptr->STRATUM) <= SNTP_STRATUM_MAX) &&
((t2[0] != 0) || (t2[1] != 0)) &&
((t3[0] != 0) || (t3[1] != 0)) &&
/* Correct behaviour requires that Transmit timestamp (t3) must be later than Recceive timestamp (t2)
* Take into account the overflow case for seconds.*/
/* Some SNTP Servers can generate wrong Seconds Fraction of timestamp.*/
((t3[0] != /* > */ t2[0]) || ((t3[0] == t2[0]) && (t3[1] >= t2[1])))
)
{
result = TRUE;
}
else
{
static void RIP_process_inresp(
RTCSPCB_PTR pcb /* [IN/OUT] incoming packet */
)
{ /* Body */
RIP_CFG_STRUCT_PTR ripcfg = RTCS_getcfg(RIP);
unsigned char *pkt = RTCSPCB_DATA(pcb);
RIP_HEADER_PTR hd = (RIP_HEADER_PTR)RTCSPCB_DATA(pcb);
RIP_ENTRY_PTR rte = (RIP_ENTRY_PTR)(pkt + sizeof(RIP_HEADER));
uint32_t pktlen = RTCSPCB_SIZE(pcb);
uint16_t rip_vers = mqx_ntohc(hd->VERSION);
IP_ROUTE_INDIRECT_PTR gate;
_ip_address netaddr, netmask;
if (pktlen < sizeof(RIP_HEADER)) {
return;
} /* Endif */
pktlen -= sizeof(RIP_HEADER);
if (RIP_is_valid_resp(pcb) == FALSE){
return;
} /* Endif */
for (; pktlen >= sizeof(RIP_ENTRY); pktlen -= sizeof(RIP_ENTRY), rte++){
if (!RIP_is_valid_rte(rte))
continue;
netaddr = mqx_ntohl(rte->NETADDR);
if (rip_vers == RIP_V2) netmask = mqx_ntohl(rte->NETMASK);
else netmask = IN_DEFAULT_NET(netaddr);
gate = ROUTE_get(netaddr, netmask);
if (!gate) RIP_create_rt(pcb, rte, rip_vers);
else RIP_update_rt(gate, pcb, rte);
}
/* if this incoming response has changed routes, do a triggered update*/
if (ripcfg->RT_CHANGED_F)
RIP_trig_upd();
} /* Endbody */
static uint32_t RIP_process_inreq(
RTCSPCB_PTR pcb /* [IN/OUT] incoming packet */
)
{ /* Body */
RIP_HEADER_PTR hd = (RIP_HEADER_PTR)RTCSPCB_DATA(pcb);
RIP_ENTRY_PTR rte = (RIP_ENTRY_PTR)((unsigned char *)hd
+ sizeof(RIP_HEADER));
uint32_t pktlen = RTCSPCB_SIZE(pcb);
uint32_t err = RTCS_OK;
/* handle the general query. rfc2453.3.9.1 */
if (pktlen == sizeof(RIP_ENTRY) + sizeof(RIP_HEADER)
&& mqx_ntohs(rte->FAMILY) == 0
&& mqx_ntohl(rte->METRIC) == RIP_MAX_METRIC){
_ip_address ipsrc = IP_source(pcb);
uint16_t srcport = UDP_source(pcb);
uint8_t version = mqx_ntohc(hd->VERSION);
return RIP_send_resp_ipif (pcb->IFSRC,ipsrc,srcport,version,0);
}
/* WORK: here handle particular routes request */
return err;
} /* Endbody */
static RTCSPCB_PTR IPREASM_reasm_dgram
(
IP_DGRAM_PTR dgram /* [IN] the dgram descriptor */
)
{ /* Body */
RTCSPCB_PTR outpcb;
PCB_PTR bpcb;
PCB_FRAGMENT *pcb_frag_ptr;
unsigned char *data;
uint32_t iphlen = (mqx_ntohc(dgram->header.IP4.IPH.VERSLEN) & 0xF) << 2;
uint32_t ip_totlen = iphlen + dgram->TOTLEN;
bpcb = RTCS_mem_alloc_system(sizeof(PCB) + sizeof(PCB_FRAGMENT) + ip_totlen);
if (!bpcb) {
return NULL;
} /* Endif */
data = (unsigned char *)bpcb + sizeof(PCB) + sizeof(PCB_FRAGMENT);
bpcb->FREE = (void(_CODE_PTR_)(PCB_PTR))_mem_free;
bpcb->PRIVATE = NULL;
pcb_frag_ptr = bpcb->FRAG;
pcb_frag_ptr->LENGTH = ip_totlen;
pcb_frag_ptr->FRAGMENT = data;
pcb_frag_ptr++;
pcb_frag_ptr->LENGTH = 0;
pcb_frag_ptr->FRAGMENT = NULL;
/* Copy the IP header with options */
mqx_htons(dgram->header.IP4.IPH.FRAGMENT, 0);
_mem_copy(&dgram->header.IP4.IPH, data, iphlen);
data += iphlen;
/*
** At this point, we really should update the LENGTH
** and CHECKSUM fields in the new IP header, but we
** don't actually need to, because this datagram is
** going straight to IPLOCAL_service, which doesn't
** check these things.
*/
/* Copy the stored data in the new packet */
IPREASM_blk_read_all(dgram, data, dgram->TOTLEN);
/* Put it in an RTCSPCB */
outpcb = RTCSPCB_alloc_recv(bpcb);
if (outpcb == NULL) {
PCB_free(bpcb);
return NULL;
} /* Endif */
//RTCSLOG_PCB_ALLOC(bpcb);
outpcb->IFSRC = dgram->IFSRC;
outpcb->TYPE = dgram->TYPE;
outpcb->LINK_OPTIONS.RX = dgram->LINKOPT;
RTCSPCB_DATA_NETWORK(outpcb) = RTCSPCB_DATA(outpcb);
RTCSPCB_SET_TRANS_PROTL(outpcb, dgram->header.IP4.PROTO);
RTCSPCB_SET_TRANS_DELTA(outpcb, iphlen);
/* Delete the local structure */
IPREASM_del_dgram(dgram);
return outpcb;
} /* Endbody */
static bool LCP_recvconfack
(
PPPFSM_CFG_PTR fsm
/* [IN] - State Machine */
)
{ /* Body */
LCP_CFG_PTR lcp_ptr = fsm->PRIVATE;
unsigned char *inp = fsm->DATA;
uint32_t sizeleft = fsm->LENGTH;
uint32_t aplen;
PPP_OPT ack_opt = lcp_ptr->RECV_OPT;
#define LCP_RACK(ci,len) \
if (sizeleft < len) goto badack; \
if (*inp++ != LCP_CI_ ## ci) goto badack; \
if (*inp++ != len) goto badack; \
sizeleft -= len
/*
** The ack must be identical to the last ConfReq we sent
*/
/*
** This situation can happend when size of data in our request packet is "0"
** So, size of received data in "ack" packet will be "0" too.
** As example: We send "REQ" packet with field PFC an ACFC "ON", modem send "NAK"
** for that field. We turn of that field, but we have not what negotiate else,
** so we send "REQ" packed,it looks like "7E FF 03 C0 21 01 6D 00 04 3F 15 7E"
** As you see size of data field is "0". But modem agree and send us "ACK" looks like
** "7E FF 03 C0 21 02 6D 00 04 F2 30 7E" and will be ready to start next stage of communication.
** In received packet from modem you can se size of data field is "0" too.
*/
if(sizeleft ==0)
{
return TRUE;
}
if (lcp_ptr->RECV_NEG.NEG_MRU) {
LCP_RACK(MRU,4);
ack_opt.MRU = mqx_ntohs(inp); inp += 2;
if (ack_opt.MRU != lcp_ptr->RECV_NEG.MRU) goto badack;
} /* Endif */
if (lcp_ptr->RECV_NEG.NEG_ACCM) {
LCP_RACK(ACCM,6);
ack_opt.ACCM = mqx_ntohl(inp); inp += 4;
if (ack_opt.ACCM != lcp_ptr->RECV_NEG.ACCM) goto badack;
} /* Endif */
if (lcp_ptr->RECV_NEG.NEG_AP) {
switch (lcp_ptr->RECV_NEG.AP) {
case PPP_PROT_CHAP: aplen = 5; break;
default: aplen = 4; break;
} /* Endswitch */
LCP_RACK(AP,aplen);
ack_opt.AP = mqx_ntohs(inp); inp += 2;
if (ack_opt.AP != lcp_ptr->RECV_NEG.AP) goto badack;
switch (ack_opt.AP) {
case PPP_PROT_CHAP:
if (mqx_ntohc(inp) != 5) goto badack; /* Only MD5 supported */
inp++;
ack_opt.AP_Start = CHAP_challenge;
break;
case PPP_PROT_PAP:
ack_opt.AP_Start = PAP_open;
break;
default:
ack_opt.AP = 0;
break;
} /* Endswitch */
} /* Endif */
if (lcp_ptr->RECV_NEG.NEG_PFC) {
LCP_RACK(PFC,2);
ack_opt.PFC = TRUE;
} /* Endif */
if (lcp_ptr->RECV_NEG.NEG_ACFC) {
LCP_RACK(ACFC,2);
ack_opt.ACFC = TRUE;
} /* Endif */
if (sizeleft) goto badack;
if (fsm->STATE < PPP_STATE_OPENED) {
lcp_ptr->RECV_OPT = ack_opt;
} /* Endif */
return TRUE;
badack:
return FALSE;
} /* Endbody */
static bool LCP_recvconfrej
(
PPPFSM_CFG_PTR fsm
/* [IN] - State Machine */
)
{ /* Body */
LCP_CFG_PTR lcp_ptr = fsm->PRIVATE;
unsigned char *inp = fsm->DATA;
uint32_t sizeleft = fsm->LENGTH;
uint32_t aplen;
PPP_OPT req_opt = lcp_ptr->RECV_OPT;
LCP_NEG req_neg = lcp_ptr->RECV_NEG;
unsigned char code;
#define LCP_RREJ(ci,len) \
if (sizeleft < len) goto badrej; \
if (*inp++ != len) goto badrej; \
sizeleft -= len; \
req_neg.NEG_ ## ci = 0; \
req_opt.ci = PPP_DEFAULT_OPTIONS.ci
/*
** Rej'd codes must be in the same order as they were in the ConfReq
*/
code = *inp++;
if (sizeleft && req_neg.NEG_MRU && (code == LCP_CI_MRU)) {
LCP_RREJ(MRU,4);
if (req_neg.MRU != mqx_ntohs(inp)) goto badrej; inp += 2;
code = *inp++;
} /* Endif */
if (sizeleft && req_neg.NEG_ACCM && (code == LCP_CI_ACCM)) {
LCP_RREJ(ACCM,6);
if (req_neg.ACCM != mqx_ntohl(inp)) goto badrej; inp += 4;
code = *inp++;
} /* Endif */
if (sizeleft && req_neg.NEG_AP && (code == LCP_CI_AP)) {
switch (req_neg.AP) {
case PPP_PROT_CHAP: aplen = 5; break;
default: aplen = 4; break;
} /* Endswitch */
LCP_RREJ(AP,aplen);
if (req_neg.AP != mqx_ntohs(inp)) goto badrej; inp += 2;
switch (req_neg.AP) {
case PPP_PROT_CHAP:
if (5 != mqx_ntohc(inp)) goto badrej; /* Only MD5 supported */
inp++;
break;
} /* Endswitch */
req_opt.AP_Start = PPP_DEFAULT_OPTIONS.AP_Start;
code = *inp++;
} /* Endif */
if (sizeleft && req_neg.NEG_PFC && (code == LCP_CI_PFC)) {
LCP_RREJ(PFC,2);
code = *inp++;
} /* Endif */
if (sizeleft && req_neg.NEG_ACFC && (code == LCP_CI_ACFC)) {
LCP_RREJ(ACFC,2);
code = *inp++;
} /* Endif */
if (sizeleft) goto badrej;
if (fsm->STATE < PPP_STATE_OPENED) {
lcp_ptr->RECV_OPT = req_opt;
lcp_ptr->RECV_NEG = req_neg;
} /* Endif */
return TRUE;
badrej:
return FALSE;
} /* Endbody */
DNAT_RULE_STRUCT_PTR DNAT_lookup_rule
(
NAT_CFG_STRUCT_PTR nat_cfg_ptr,
IP_HEADER_PTR ip_header_ptr,
bool pub_to_prv
)
{ /* Body */
TRANSPORT_UNION transport;
DNAT_ELEMENT_STRUCT_PTR element_ptr;
_ip_address source_ip = mqx_ntohl(ip_header_ptr->SOURCE);
uint32_t ip_protocol;
uint16_t source_port, destination_port; /* source port and destination port */
transport.PTR = TRANSPORT_PTR(ip_header_ptr);
ip_protocol = mqx_ntohc(ip_header_ptr->PROTOCOL);
/* NAT spports ICMP, UDP and TCP transport layer protocols */
switch (ip_protocol) {
case IPPROTO_TCP:
destination_port = mqx_ntohs(transport.TCP_PTR->dest_port);
source_port = mqx_ntohs(transport.TCP_PTR->source_port);
break;
case IPPROTO_UDP:
destination_port = mqx_ntohs(transport.UDP_PTR->DEST_PORT);
source_port = mqx_ntohs(transport.UDP_PTR->SRC_PORT);
break;
case IPPROTO_ICMP:
/* Allow all ICMP request/reply */
return NULL;
} /* Endswitch */
element_ptr = (DNAT_ELEMENT_STRUCT_PTR) _queue_head(&nat_cfg_ptr->RULE_QUEUE);
/*
** Check for the target port and then forward the packet to the corresponding
** DNAT rule target ip.
*/
while (element_ptr != NULL) {
if (element_ptr->RULE.IP_PROTOCOL == ip_protocol) {
if (pub_to_prv) {
if ((destination_port >= element_ptr->RULE.PUBLIC_START_PORT) &&
(destination_port <= element_ptr->RULE.PUBLIC_END_PORT)) {
break;
}
} else {
if ((source_ip == element_ptr->RULE.PRIVATE_IP) &&
(source_port >= element_ptr->RULE.PRIVATE_START_PORT) &&
(source_port <= element_ptr->RULE.PRIVATE_END_PORT)) {
break;
}
}
}
element_ptr = (DNAT_ELEMENT_STRUCT_PTR) _queue_next(&nat_cfg_ptr->RULE_QUEUE, &element_ptr->ELEMENT);
} /* Endwhile */
if (element_ptr!=NULL) {
return &element_ptr->RULE;
} else {
return NULL;
}
}/* Endbody */
void ICMP_send_error_internal
(
uint8_t type, /* [IN] the type to send */
uint8_t code, /* [IN] the code to send */
uint32_t param, /* [IN] a parameter */
IP_HEADER_PTR iph, /* [IN] the IP header */
RTCSPCB_PTR origpcb, /* [IN] pcb with bad packet */
uint32_t maxlen /* [IN] the max data len to send, 0 = default */
)
{ /* Body */
ICMP_CFG_STRUCT_PTR ICMP_cfg_ptr = RTCS_getcfg(ICMP);
RTCSPCB_PTR pcb;
ICMP_ERR_HEADER_PTR icmph;
_ip_address ipsrc = mqx_ntohl(iph->SOURCE);
_ip_address ipdst = mqx_ntohl(iph->DEST);
uint16_t iphdrlen = (mqx_ntohc(iph->VERSLEN) & 0x0F) << 2;
uint16_t ippktlen = mqx_ntohs(iph->LENGTH) - iphdrlen;
uint16_t checksum;
_ip_address icmpsrc = IP_is_local(NULL,ipdst) ? ipdst : INADDR_ANY;
uint32_t error;
unsigned char *buffer;
uint32_t temp;
#if RTCSCFG_ENABLE_NAT
TCP_HEADER_PTR tcp_hdr;
UDP_HEADER_PTR udp_hdr;
IP_HEADER_PTR ip_hdr;
uint32_t protocol;
uint16_t src_port, dest_port;
uint32_t (_CODE_PTR_ *nat_exec)(RTCSPCB_PTR *);
#endif
#if BSPCFG_ENET_HW_TX_PROTOCOL_CHECKSUM
_ip_address if_addr;
IP_IF_PTR if_ptr;
#endif
/*
** Only include up to a maximum of maxlen bytes of data from the
** original IP datagram
*/
if (!maxlen) {
maxlen = IP_DEFAULT_MTU - sizeof(IP_HEADER) - sizeof(ICMP_HEADER) - 4;
} /* Endif */
if (origpcb) {
temp = RTCSPCB_DATA(origpcb) - RTCSPCB_DATA_NETWORK(origpcb);
if (maxlen > origpcb->HEADER_FRAG_USED + temp) {
maxlen = origpcb->HEADER_FRAG_USED + temp;
} /* Endif */
} /* Endif */
if (ippktlen + iphdrlen > maxlen) {
ippktlen = maxlen - iphdrlen;
} /* Endif */
/* Don't send an error in response to an ICMP error */
if (mqx_ntohc(iph->PROTOCOL) == IPPROTO_ICMP) {
/* Make sure the packet has at least a 'TYPE' field */
if (ippktlen == 0) {
return;
} /* Endif */
icmph = (ICMP_ERR_HEADER_PTR)((unsigned char *)iph + iphdrlen);
if (!ICMPTYPE_ISQUERY(mqx_ntohc(icmph->HEAD.TYPE))) {
return;
} /* Endif */
} /* Endif */
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_TOTAL++);
/* Allocate a PCB */
pcb = RTCSPCB_alloc_send();
if (pcb == NULL) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
return;
} /* Endif */
//RTCSLOG_PCB_ALLOC(pcb);
if (origpcb) {
/* Add a dependency and a pointer to the ICMP data */
RTCSPCB_depend(pcb, origpcb);
error = RTCSPCB_append_fragment(pcb, iphdrlen + ippktlen, (unsigned char *)iph);
} else {
/* Reserve space for the ICMP data */
buffer = RTCS_mem_alloc_system(iphdrlen + ippktlen);
if (!buffer) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
IF_ICMP_STATS_ENABLED(RTCS_seterror(&ICMP_cfg_ptr->STATS.ERR_TX, RTCSERR_OUT_OF_MEMORY, (uint32_t)pcb));
RTCSLOG_PCB_FREE(pcb, RTCSERR_OUT_OF_MEMORY);
RTCSPCB_free(pcb);
return;
} /* Endif */
_mem_set_type(buffer, MEM_TYPE_ICMP_DATA);
_mem_copy(iph, buffer, iphdrlen + ippktlen);
error = RTCSPCB_append_fragment_autofree(pcb, iphdrlen + ippktlen, buffer);
if (error) {
_mem_free(buffer);
} /* Endif */
} /* Endif */
if (!error) {
error = RTCSPCB_insert_header(pcb, sizeof(ICMP_HEADER) + 4);
} /* Endif */
if (error) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
IF_ICMP_STATS_ENABLED(RTCS_seterror(&ICMP_cfg_ptr->STATS.ERR_TX, error, (uint32_t)pcb));
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
return;
} /* Endif */
RTCSLOG_PCB_WRITE(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_ICMP), 0);
/* Build the header */
icmph = (ICMP_ERR_HEADER_PTR)RTCSPCB_DATA(pcb);
mqx_htonc(icmph->HEAD.TYPE, type);
mqx_htonc(icmph->HEAD.CODE, code);
mqx_htons(icmph->HEAD.CHECKSUM, 0);
mqx_htonl(icmph->DATA, param);
#if BSPCFG_ENET_HW_TX_PROTOCOL_CHECKSUM
/* HW-offload.*/
if_addr = IP_route_find(ipsrc /* Destination*/, 1);
if_ptr = IP_find_if(if_addr);
if( (if_ptr
&& (if_ptr->FEATURES & IP_IF_FEATURE_HW_TX_PROTOCOL_CHECKSUM)
&& (IP_will_fragment(if_ptr, RTCSPCB_SIZE(pcb)) == FALSE))
#if RTCSCFG_LINKOPT_8023
&& (pcb->LINK_OPTIONS.TX.OPT_8023 == 0)
#endif
)
{
pcb->TYPE |= RTCSPCB_TYPE_HW_PROTOCOL_CHECKSUM;
}
else
#endif
{
checksum = IP_Sum_PCB (0, pcb);
checksum = IP_Sum_invert(checksum);
mqx_htons(icmph->HEAD.CHECKSUM, checksum);
pcb->TYPE &= ~RTCSPCB_TYPE_HW_PROTOCOL_CHECKSUM;
}
#if RTCSCFG_ENABLE_ICMP_STATS
/* Update the statistics */
switch (type) {
case ICMPTYPE_DESTUNREACH: ICMP_cfg_ptr->STATS.ST_TX_DESTUNREACH++; break;
case ICMPTYPE_TIMEEXCEED: ICMP_cfg_ptr->STATS.ST_TX_TIMEEXCEED++; break;
case ICMPTYPE_PARMPROB: ICMP_cfg_ptr->STATS.ST_TX_PARMPROB++; break;
case ICMPTYPE_SRCQUENCH: ICMP_cfg_ptr->STATS.ST_TX_SRCQUENCH++; break;
case ICMPTYPE_REDIRECT: ICMP_cfg_ptr->STATS.ST_TX_REDIRECT++; break;
case ICMPTYPE_ECHO_REQ: ICMP_cfg_ptr->STATS.ST_TX_ECHO_REQ++; break;
case ICMPTYPE_ECHO_REPLY: ICMP_cfg_ptr->STATS.ST_TX_ECHO_REPLY++; break;
case ICMPTYPE_TIME_REQ: ICMP_cfg_ptr->STATS.ST_TX_TIME_REQ++; break;
case ICMPTYPE_TIME_REPLY: ICMP_cfg_ptr->STATS.ST_TX_TIME_REPLY++; break;
case ICMPTYPE_INFO_REQ: ICMP_cfg_ptr->STATS.ST_TX_INFO_REQ++; break;
case ICMPTYPE_INFO_REPLY: ICMP_cfg_ptr->STATS.ST_TX_INFO_REPLY++; break;
default: ICMP_cfg_ptr->STATS.ST_TX_OTHER++; break;
} /* Endswitch */
#endif
#if RTCSCFG_ENABLE_NAT
/* Reverse NAT (if it is installed) on the origpcb,
otherwise the icmp error will not get sent to the
original src */
nat_exec = RTCS_getcfg(NAT);
if (origpcb && nat_exec && *nat_exec) {
// swap src and dst IPs and ports so NAT_apply
// will process the pcb
ip_hdr = (IP_HEADER_PTR)RTCSPCB_DATA(origpcb);
protocol = mqx_ntohc(ip_hdr->PROTOCOL);
// Swap ports if it is udp or tcp
if ((protocol == IPPROTO_TCP) || (protocol == IPPROTO_UDP)) {
switch(protocol)
{
case IPPROTO_TCP:
tcp_hdr = (TCP_HEADER_PTR)((unsigned char *)ip_hdr + IPH_LEN(ip_hdr));
dest_port = mqx_ntohs(tcp_hdr->dest_port);
src_port = mqx_ntohs(tcp_hdr->source_port);
mqx_htons(tcp_hdr->dest_port, src_port);
mqx_htons(tcp_hdr->source_port, dest_port);
break;
case IPPROTO_UDP:
udp_hdr = (UDP_HEADER_PTR)((unsigned char *)ip_hdr + IPH_LEN(ip_hdr));
dest_port = mqx_ntohs(udp_hdr->DEST_PORT);
src_port = mqx_ntohs(udp_hdr->SRC_PORT);
mqx_htons(udp_hdr->DEST_PORT, src_port);
mqx_htons(udp_hdr->SRC_PORT, dest_port);
break;
default:
// should not get here
break;
}
}
// swap IPs
ipsrc = mqx_ntohl(ip_hdr->SOURCE);
ipdst = mqx_ntohl(ip_hdr->DEST);
mqx_htonl(ip_hdr->SOURCE, ipdst);
mqx_htonl(ip_hdr->DEST,ipsrc);
// call NAT
error = (*nat_exec)(&origpcb);
if (!error) {
// swap IPs and ports back
ip_hdr = (IP_HEADER_PTR)RTCSPCB_DATA(origpcb);
protocol = mqx_ntohc(ip_hdr->PROTOCOL);
// swap ports if it is udp or tcp
if ((protocol == IPPROTO_TCP) || (protocol == IPPROTO_UDP)) {
switch(protocol)
{
case IPPROTO_TCP:
tcp_hdr = (TCP_HEADER_PTR)((unsigned char *)ip_hdr + IPH_LEN(ip_hdr));
dest_port = mqx_ntohs(tcp_hdr->dest_port);
src_port = mqx_ntohs(tcp_hdr->source_port);
mqx_htons(tcp_hdr->dest_port, src_port);
mqx_htons(tcp_hdr->source_port, dest_port);
break;
case IPPROTO_UDP:
udp_hdr = (UDP_HEADER_PTR)((unsigned char *)ip_hdr + IPH_LEN(ip_hdr));
dest_port = mqx_ntohs(udp_hdr->DEST_PORT);
src_port = mqx_ntohs(udp_hdr->SRC_PORT);
mqx_htons(udp_hdr->DEST_PORT, src_port);
mqx_htons(udp_hdr->SRC_PORT, dest_port);
break;
default:
// should not get here
break;
}
}
// swap IPs
ipsrc = mqx_ntohl(ip_hdr->SOURCE);
ipdst = mqx_ntohl(ip_hdr->DEST);
mqx_htonl(ip_hdr->SOURCE, ipdst);
mqx_htonl(ip_hdr->DEST,ipsrc);
// Recalculate the cksum
mqx_htons(icmph->HEAD.CHECKSUM, 0);
checksum = IP_Sum_PCB (0, pcb);
checksum = IP_Sum_invert(checksum);
mqx_htons(icmph->HEAD.CHECKSUM, checksum);
// recalculate icmpsrc, and use new ipsrc.
ipdst = mqx_ntohl(ip_hdr->DEST);
ipsrc = mqx_ntohl(ip_hdr->SOURCE);
icmpsrc = IP_is_local(NULL,ipdst) ? ipdst : INADDR_ANY;
}
}
#endif
/* Send it */
IP_send(pcb, IPPROTO_ICMP, icmpsrc, ipsrc, 0);
} /* Endbody */
void ICMP_service
(
RTCSPCB_PTR pcb, /* [IN/OUT] incoming packet */
void *dummy /* [IN] not used */
)
{ /* Body */
ICMP_CFG_STRUCT_PTR ICMP_cfg_ptr;
ICMP_HEADER_PTR packet;
_ip_address source, dest;
uint32_t error;
uint16_t chksum;
unsigned char type;
#if BSPCFG_ENET_HW_TX_PROTOCOL_CHECKSUM
_ip_address if_addr;
IP_IF_PTR if_ptr;
#endif
ICMP_cfg_ptr = RTCS_getcfg(ICMP);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_TOTAL++);
packet = (ICMP_HEADER_PTR)RTCSPCB_DATA(pcb);
source = IP_source(pcb);
dest = IP_dest(pcb);
type = mqx_ntohc(packet->TYPE);
/*
** Make sure that
** sizeof(ICMP_HEADER) <= RTCSPCB_SIZE(pcb)
*/
if (RTCSPCB_SIZE(pcb) < sizeof(ICMP_HEADER)) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_SMALL_DGRAM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_ICMP_BAD_HEADER);
RTCSPCB_free(pcb);
return;
} /* Endif */
#if BSPCFG_ENET_HW_RX_PROTOCOL_CHECKSUM
/* HW-offload.*/
if( ((pcb->TYPE & RTCSPCB_TYPE_HW_PROTOCOL_CHECKSUM)==0)
#if RTCSCFG_LINKOPT_8023
||(pcb->LINK_OPTIONS.RX.OPT_8023 == 1)
#endif
)
#endif
{
/* Verify the checksum */
if (IP_Sum_PCB(0, pcb) != 0xFFFF)
{
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_BAD_CHECKSUM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_ICMP_BAD_CHECKSUM);
RTCSPCB_free(pcb);
return;
}
}
RTCSLOG_PCB_READ(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_ICMP), 0);
switch (type) {
case ICMPTYPE_REDIRECT:
#if RTCSCFG_ENABLE_GATEWAYS
{ /* Scope */
_ip_address origdest, gateway;
ICMP_ERR_HEADER_PTR rdpacket = (ICMP_ERR_HEADER_PTR)packet;
IPIF_PARM parms;
/*
** Make sure that
** sizeof(ICMP_ERR_HEADER) <= RTCSPCB_SIZE(pcb)
*/
if (RTCSPCB_SIZE(pcb) < sizeof(ICMP_ERR_HEADER)) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_SMALL_DGRAM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_ICMP_BAD_HEADER);
RTCSPCB_free(pcb);
return;
} /* Endif */
gateway = mqx_ntohl(rdpacket->DATA);
origdest = mqx_ntohl(rdpacket->IP.DEST);
/* If we receive a redirect to ourselves, silently discard it.*/
/* Ignore unasigned address.*/
if( IP_is_local(NULL, gateway) || (gateway == INADDR_ANY))
{
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
}
else if(IP_is_gate(source, origdest))
{
parms.address = gateway;
parms.network = origdest;
parms.netmask = 0xFFFFFFFFL;
parms.locmask = 0;
RTCSCMD_internal(parms, IPIF_gate_add_redirect);
}
else
{
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_RD_NOTGATE++);
} /* Endif */
} /* Endscope */
#else
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
#endif
break;
case ICMPTYPE_ECHO_REQ:
/* RFC1122: An ICMP Echo Request destined to an IP broadcast or IP
* multicast address MAY be silently discarded.*/
if((dest == INADDR_BROADCAST) || (IN_MULTICAST(dest) && (ip_if_is_joined(pcb->IFSRC, dest) == false)) )
{
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
}
else
{
error = RTCSPCB_next(pcb, sizeof(ICMP_HEADER));
if (error) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_ERRORS++);
IF_ICMP_STATS_ENABLED(RTCS_seterror(&ICMP_cfg_ptr->STATS.ERR_RX, error, (uint32_t)pcb));
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
return;
} /* Endif */
/*
** RTCSPCB_fork() failing isn't a serious error, so we don't check
** the error code
*/
RTCSPCB_fork(pcb);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_TOTAL++);
RTCSLOG_PCB_WRITE(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_ICMP), 0);
error = RTCSPCB_insert_header(pcb, sizeof(ICMP_HEADER));
if (error) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_ECHO_REQ++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
IF_ICMP_STATS_ENABLED(RTCS_seterror(&ICMP_cfg_ptr->STATS.ERR_TX, error, (uint32_t)pcb));
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
return;
}
/* Change type from Echo to Echo Reply and recalculate checksum */
packet = (ICMP_HEADER_PTR)RTCSPCB_DATA(pcb);
mqx_htonc(packet->TYPE, ICMPTYPE_ECHO_REPLY);
mqx_htonc(packet->CODE, 0);
mqx_htons(packet->CHECKSUM, 0);
pcb->IP_SUM_PTR = NULL;
#if BSPCFG_ENET_HW_TX_PROTOCOL_CHECKSUM
/* HW-offload.*/
if_addr = IP_route_find(source /* Destination*/, 1);
if_ptr = IP_find_if(if_addr);
if( (if_ptr
&& (if_ptr->FEATURES & IP_IF_FEATURE_HW_TX_PROTOCOL_CHECKSUM)
&& (IP_will_fragment(if_ptr, RTCSPCB_SIZE(pcb)) == FALSE))
#if RTCSCFG_LINKOPT_8023
&& (pcb->LINK_OPTIONS.TX.OPT_8023 == 0)
#endif
)
{
pcb->TYPE |= RTCSPCB_TYPE_HW_PROTOCOL_CHECKSUM;
}
else
#endif
{
chksum = IP_Sum_PCB(0, pcb);
chksum = IP_Sum_invert(chksum);
mqx_htons(packet->CHECKSUM, chksum);
pcb->TYPE &= ~RTCSPCB_TYPE_HW_PROTOCOL_CHECKSUM;
}
if(IN_MULTICAST(dest) || IP_addr_is_broadcast(pcb, dest) )
{
dest = IP_get_ipif_addr(pcb->IFSRC);
}
/* Send the Echo Reply whence came the Echo */
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_TX_ECHO_REPLY++);
IP_send(pcb, IPPROTO_ICMP, dest /* Source*/, source /* Destination*/, 0);
pcb = NULL;
}
break;
case ICMPTYPE_ECHO_REPLY:
{ /* Scope */
ICMP_ECHO_HEADER_PTR echopacket = (ICMP_ECHO_HEADER_PTR)packet;
ICMP_ECHO_PARAM_PTR parms;
uint16_t id, seq;
/*
** Make sure that
** sizeof(ICMP_ECHO_HEADER) <= RTCSPCB_SIZE(pcb)
*/
if (RTCSPCB_SIZE(pcb) < sizeof(ICMP_ECHO_HEADER)) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.ST_RX_SMALL_DGRAM++);
RTCSLOG_PCB_FREE(pcb, RTCSERR_ICMP_BAD_HEADER);
RTCSPCB_free(pcb);
return;
} /* Endif */
/*
** get the ID and Sequence number from the packet
*/
id = mqx_ntohs(echopacket->ID);
seq = mqx_ntohs(echopacket->SEQ);
/*
** Find a match for the ID and sequence number
*/
for (parms=ICMP_cfg_ptr->ECHO_PARAM_HEAD; parms; parms=parms->NEXT) {
if ((parms->ping_param->id == id) && (parms->seq == seq)) {
/* received reply for the ping request */
if (parms->NEXT) {
parms->NEXT->PREV = parms->PREV;
}
*parms->PREV = parms->NEXT;
TCPIP_Event_cancel(&parms->EXPIRE);
/* Calculate round trip time */
parms->ping_param->round_trip_time = RTCS_timer_get_interval(parms->start_time, RTCS_time_get());
/* IP address of echo-reply message.*/
{
IP_HEADER_PTR iphead = (IP_HEADER_PTR)RTCSPCB_DATA_NETWORK(pcb);
memset(&parms->ping_param->addr, 0, sizeof(parms->ping_param->addr));
parms->ping_param->addr.sa_family = AF_INET;
((sockaddr_in*)(&parms->ping_param->addr))->sin_addr.s_addr = mqx_ntohl(iphead->SOURCE);
}
RTCSCMD_complete(parms, RTCS_OK);
break;
} /* Endif */
} /* Endfor */
} /* Endscope */
break;
case ICMPTYPE_DESTUNREACH:
case ICMPTYPE_TIMEEXCEED:
{ /* Scope */
IP_HEADER_PTR ip;
ICMP_ERR_HEADER_PTR icmp_err = (ICMP_ERR_HEADER_PTR)packet;
uint32_t len, remain;
bool discard = TRUE;
unsigned char code;
/*
** Check if the attached IP header is IP over IP, and if so, strip IP
** headers until we find one whose source address is not local. Then we
** forward the ICMP error to that IP address
*/
remain = RTCSPCB_SIZE(pcb);
/* Make sure we have at least a full IP header */
if (remain >= sizeof(ICMP_HEADER) + 4 + sizeof(IP_HEADER)) {
ip = (IP_HEADER_PTR)((unsigned char *)packet + sizeof(ICMP_HEADER) + 4);
remain -= sizeof(ICMP_HEADER) + 4;
do {
/* Make sure the IP header is IP over IP */
if (mqx_ntohc(ip->PROTOCOL) != IPPROTO_IPIP) {
break;
} /* Endif */
/* Make sure we have a full IP header + 8 bytes */
len = (mqx_ntohc(ip->VERSLEN) & 0x0F) << 2;
if (remain < len + sizeof(IP_HEADER)) {
break;
} /* Endif */
/* Get next header */
ip = (IP_HEADER_PTR)((unsigned char *)(ip) + len);
remain -= len;
source = mqx_ntohl(ip->SOURCE);
discard = IP_is_local(NULL, source);
} while(discard);
len = (mqx_ntohc(ip->VERSLEN) & 0x0F) << 2;
/*
** discard is true if we are the originator of the IP packet
** in error, or if there was not enough information to find the
** originator. We make sure discard is false, and there is at
** least a full IP header + 8 bytes of data left
*/
if (!discard && (len + 8 <= remain)) {
if (type == ICMPTYPE_DESTUNREACH) {
code = mqx_ntohc(packet->CODE);
switch (code) {
case ICMPCODE_DU_PROTO_UNREACH:
/*
** If we are sending back to the originator, and the
** originator did not use IP over IP, the protocol
** unreachable error is useless.
*/
code = ICMPCODE_DU_NET_UNREACH;
break;
case ICMPCODE_DU_PORT_UNREACH:
/* It doesn't make sense to receive this */
discard = TRUE;
break;
case ICMPCODE_DU_SRCROUTE:
discard = TRUE;
break;
} /* Endswitch */
} else {
/*
** Type is ICMPTYPE_TIMEEXCEED
**
** Problem with routing loops within tunnel. Originator
** does not need to know about tunnel.
*/
type = ICMPTYPE_DESTUNREACH;
code = ICMPCODE_DU_HOST_UNREACH;
} /* Endif */
if (!discard) {
ICMP_send_error_internal(type, code, mqx_ntohl(icmp_err->DATA),
ip, NULL, remain);
} /* Endif */
} /* Endif */
} /* Endif */
} /* Endscope */
break;
} /* End Switch */
#if RTCSCFG_ENABLE_ICMP_STATS
/* Update the statistics */
switch (type) {
case ICMPTYPE_DESTUNREACH: ICMP_cfg_ptr->STATS.ST_RX_DESTUNREACH++; break;
case ICMPTYPE_TIMEEXCEED: ICMP_cfg_ptr->STATS.ST_RX_TIMEEXCEED++; break;
case ICMPTYPE_PARMPROB: ICMP_cfg_ptr->STATS.ST_RX_PARMPROB++; break;
case ICMPTYPE_SRCQUENCH: ICMP_cfg_ptr->STATS.ST_RX_SRCQUENCH++; break;
case ICMPTYPE_REDIRECT: ICMP_cfg_ptr->STATS.ST_RX_REDIRECT++; break;
case ICMPTYPE_ECHO_REQ: ICMP_cfg_ptr->STATS.ST_RX_ECHO_REQ++; break;
case ICMPTYPE_ECHO_REPLY: ICMP_cfg_ptr->STATS.ST_RX_ECHO_REPLY++; break;
case ICMPTYPE_TIME_REQ: ICMP_cfg_ptr->STATS.ST_RX_TIME_REQ++; break;
case ICMPTYPE_TIME_REPLY: ICMP_cfg_ptr->STATS.ST_RX_TIME_REPLY++; break;
case ICMPTYPE_INFO_REQ: ICMP_cfg_ptr->STATS.ST_RX_INFO_REQ++; break;
case ICMPTYPE_INFO_REPLY: ICMP_cfg_ptr->STATS.ST_RX_INFO_REPLY++; break;
default:
ICMP_cfg_ptr->STATS.ST_RX_OTHER++;
ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++;
break;
} /* Endswitch */
#endif
if (pcb) {
RTCSLOG_PCB_FREE(pcb, RTCS_OK);
RTCSPCB_free(pcb);
} /* Endif */
} /* Endbody */
HOSTENT_STRUCT *DNS_parse_UDP_response
(
unsigned char *buffer_ptr,
unsigned char *name_ptr,
uint16_t query_type
)
{ /* Body */
DNS_MESSAGE_HEADER_STRUCT *message_head_ptr = NULL;
DNS_RESPONSE_RR_MIDDLE_STRUCT *answer_middle;
INTERNAL_HOSTENT_STRUCT *host_ptr = &RTCS_HOST;
unsigned char *answer_ptr;
unsigned char *answer_tail;
unsigned char *temp_ptr;
uint16_t response_length, answer_type,
name_size, number_of_answers, num_queries;
uint32_t i, name_index = 0;
uint32_t j = 0;
uint32_t k = 0;
uint32_t buffer_size;
uint32_t *addr_ptr;
bool unknown_answer_type = FALSE;
message_head_ptr = (DNS_MESSAGE_HEADER_STRUCT *)buffer_ptr;
buffer_size = sizeof(DNS_MESSAGE_HEADER_STRUCT);
temp_ptr = buffer_ptr + sizeof( DNS_MESSAGE_HEADER_STRUCT );
/* Zero the global HOSTENT_STRUCT */
_mem_zero((char *)host_ptr, sizeof(INTERNAL_HOSTENT_STRUCT));
/* Get the number of queries. */
num_queries = mqx_ntohs(message_head_ptr->QDCOUNT);
for (i = 0; i < num_queries; i++) {
name_size = 0;
while( (mqx_ntohc(temp_ptr) != '\0') &&
name_size < DNS_MAX_CHARS_IN_NAME ) {
name_size = name_size + mqx_ntohc(temp_ptr) + 1;
temp_ptr = temp_ptr + mqx_ntohc(temp_ptr) + 1;
} /* Endwhile */
/* To include the terminating NULL char */
name_size++;
buffer_size += (name_size + sizeof(DNS_MESSAGE_TAIL_STRUCT));
temp_ptr += (1 + sizeof(DNS_MESSAGE_TAIL_STRUCT));
} /* Endfor */
number_of_answers = mqx_ntohs(message_head_ptr->ANCOUNT);
if (number_of_answers > DNS_MAX_NAMES ) {
number_of_answers = DNS_MAX_NAMES;
} /* Endif */
host_ptr->HOSTENT.h_aliases = &host_ptr->ALIASES[0];
host_ptr->HOSTENT.h_addr_list = (char **)&host_ptr->ADDRESSES[0];
host_ptr->ADDRESSES[0] = NULL;
host_ptr->HOSTENT.h_name = NULL;
host_ptr->HOSTENT.h_length = sizeof( _ip_address );
for (i = 0; (i < number_of_answers) && (j < DNS_MAX_ADDRS) &&
(k < DNS_MAX_NAMES); i++ )
{
answer_ptr = temp_ptr;
name_size = 0;
while( (mqx_ntohc(temp_ptr) != '\0') &&
name_size < DNS_MAX_CHARS_IN_NAME &&
!(mqx_ntohc(temp_ptr) & DNS_COMPRESSED_NAME_MASK)) {
name_size += mqx_ntohc(temp_ptr);
temp_ptr += mqx_ntohc(temp_ptr) + 1;
} /* Endwhile */
if ( mqx_ntohc(temp_ptr) & DNS_COMPRESSED_NAME_MASK ) {
temp_ptr++;
}/* Endif */
temp_ptr++;
answer_middle = (DNS_RESPONSE_RR_MIDDLE_STRUCT *)temp_ptr;
response_length = mqx_ntohs(answer_middle->RDLENGTH);
answer_type = mqx_ntohs(answer_middle->TYPE);
temp_ptr += sizeof(DNS_RESPONSE_RR_MIDDLE_STRUCT);
answer_tail = temp_ptr;
temp_ptr += response_length;
switch ( answer_type ) {
case DNS_A:
if ( host_ptr->HOSTENT.h_name == NULL ) {
host_ptr->HOSTENT.h_name =
(char *)DNS_parse_answer_name_to_dotted_form(
buffer_ptr, answer_ptr, name_index );
name_index++;
} /* Endif */
RTCS_HOST_ADDRS[j] = mqx_ntohl((unsigned char *)answer_tail);
/*
** j is used in case BOTH CNAME and A data is received. If CNAME
** answer is first, will write into wrong address space if using
** i.
*/
host_ptr->ADDRESSES[j] = &RTCS_HOST_ADDRS[j];
j++;
/*
** This is to assure that the first IP address used is the first
** one that was given
*/
host_ptr->IP_address = *host_ptr->ADDRESSES[0];
break;
case DNS_PTR:
if (query_type == DNS_PTR) {
if (host_ptr->HOSTENT.h_name != NULL) {
host_ptr->ALIASES[k] = host_ptr->HOSTENT.h_name;
k++;
} /* Endif */
host_ptr->HOSTENT.h_name =
(char *)DNS_parse_answer_name_to_dotted_form(
buffer_ptr, answer_tail, name_index );
name_index++;
addr_ptr = RTCS_mem_alloc_zero( sizeof( _ip_address ));
if ( addr_ptr == NULL ) {
RTCS_log_error(ERROR_DNS, RTCSERR_DNS_UNABLE_TO_ALLOCATE_MEMORY,
0, 0, 0);
return( NULL );
}/* Endif */
*addr_ptr = *((_ip_address *)name_ptr);
host_ptr->ADDRESSES[j] = addr_ptr;
j++;
host_ptr->IP_address = *host_ptr->ADDRESSES[0];
} else {
host_ptr->ALIASES[k] = (char *)
DNS_parse_answer_name_to_dotted_form( buffer_ptr,
answer_tail, name_index );
name_index++;
k++;
} /* Endif */
break;
case DNS_CNAME:
/* the k is used for ALIASES as the j is used for ADDRESSES */
host_ptr->ALIASES[k] = (char *)
DNS_parse_answer_name_to_dotted_form(
buffer_ptr, answer_tail, name_index );
name_index++;
k++;
break;
default:
unknown_answer_type = TRUE;
} /* Endswitch */
if ( unknown_answer_type == TRUE ) {
break;
}/* Endif */
host_ptr->ADDRESSES[j] = NULL;
host_ptr->ALIASES[k] = NULL;
host_ptr->HOSTENT.h_addrtype = mqx_ntohs(answer_middle->CLASS);
} /* Endfor */
if ( number_of_answers == 0 ) {
return( NULL );
} /* Endif */
return( &RTCS_HOST.HOSTENT );
} /* Endbody */
void BOOTP_service
(
RTCSPCB_PTR rtcs_pcb /* [IN] BOOTREPLY packet */
)
{ /* Body */
IP_IF_PTR if_ptr = (IP_IF_PTR)rtcs_pcb->IFSRC;
TCPIP_PARM_BOOTP *parms = (TCPIP_PARM_BOOTP *)if_ptr->BOOT;
BOOTP_CFG_PTR bootp = (BOOTP_CFG_PTR) &parms->config;
BOOTP_PACKET_PTR bootreply;
IPIF_PARM parms_bind;
uint32_t error;
unsigned char *opt;
unsigned char len, optval, optlen;
/* Make sure the datagram is large enough */
bootreply = (BOOTP_PACKET_PTR)RTCSPCB_DATA(rtcs_pcb);
if (RTCSPCB_SIZE(rtcs_pcb) < sizeof(BOOTP_PACKET)) {
RTCSLOG_PCB_FREE(rtcs_pcb, RTCS_OK);
RTCSPCB_free(rtcs_pcb);
return;
} /* Endif */
/* Make sure the XID matches */
if (mqx_ntohl(bootreply->HEAD.XID) != bootp->XID) {
RTCSLOG_PCB_FREE(rtcs_pcb, RTCS_OK);
RTCSPCB_free(rtcs_pcb);
return;
} /* Endif */
RTCSLOG_PCB_READ(rtcs_pcb, RTCS_LOGCTRL_PORT(IPPORT_BOOTPC), 0);
/* OK, assume this reply is for us */
BOOTP_close(if_ptr);
/* Get our IP address, and pick the default netmask */
parms_bind.ihandle = if_ptr;
parms_bind.address = mqx_ntohl(bootreply->HEAD.YIADDR);
parms_bind.locmask = 0xFFFFFFFFL;
parms_bind.netmask = IN_DEFAULT_NET(parms_bind.address);
parms_bind.probe = FALSE;
parms->data->SADDR = mqx_ntohl(bootreply->HEAD.SIADDR);
#if RTCSCFG_BOOTP_RETURN_YIADDR
parms->data->CLIENTADDR = mqx_ntohl(bootreply->HEAD.YIADDR);
#endif
_mem_copy(bootreply->DATA.SNAME, parms->data->SNAME, sizeof(BOOTP_DATA));
RTCSLOG_PCB_FREE(rtcs_pcb, RTCS_OK);
RTCSPCB_free(rtcs_pcb);
/* Parse the vend field for recognized options */
opt = parms->data->OPTIONS;
len = sizeof(parms->data->OPTIONS);
if (mqx_ntohl(opt) == BOOTP_MAGIC) {
opt += 4;
len -= 4;
#define BOOTP_NEXTOPT opt += optlen; \
break
while (len) {
/* Get the next option code */
optval = mqx_ntohc(opt);
opt++;
len--;
/* Interpret the pad and end options */
if (optval == BOOTPOPT_END) break;
if (optval == BOOTPOPT_PAD) continue;
/* All other codes have a length byte */
if (len == 0) break;
optlen = mqx_ntohc(opt);
opt++;
len--;
if (len < optlen) break;
len -= optlen;
switch (optval) {
case BOOTPOPT_MASK:
if (optlen != 4) {BOOTP_NEXTOPT;}
parms_bind.netmask = mqx_ntohl(opt);
opt += 4;
break;
default:
BOOTP_NEXTOPT;
} /* Endswitch */
} /* Endwhile */
} /* Endif */
/* Bind the received IP address to this interface */
error = RTCSCMD_internal(parms_bind, IPIF_bind);
/* Done -- unblock the application */
RTCSCMD_complete(parms, error);
} /* Endbody */
