void BOOTP_open
(
TCPIP_PARM_BOOTP _PTR_ parms
)
{ /* Body */
IP_IF_PTR if_ptr = (IP_IF_PTR)parms->handle;
BOOTP_CFG_PTR bootp = (BOOTP_CFG_PTR) &parms->config;
uint_32 error;
error = BOOT_open(BOOT_service);
if (error) {
RTCSCMD_complete(parms, error);
return;
} /* Endif */
if_ptr->BOOTFN = BOOTP_service;
/* Pick a random transaction ID */
bootp->XID = RTCS_rand();
/* Set initial timeout */
bootp->TIMEOUT = BOOTP_TIMEOUT_MIN;
bootp->SECS = 0;
/* Build a BOOTREQUEST packet */
htonc(bootp->PACKET.OP, BOOTPOP_BOOTREQUEST);
htonc(bootp->PACKET.HTYPE, if_ptr->DEV_TYPE);
htonc(bootp->PACKET.HLEN, if_ptr->DEV_ADDRLEN);
htonc(bootp->PACKET.HOPS, 0);
htonl(bootp->PACKET.XID, bootp->XID);
htons(bootp->PACKET.FLAGS, 0x8000);
htonl(bootp->PACKET.CIADDR, INADDR_ANY);
htonl(bootp->PACKET.YIADDR, INADDR_ANY);
htonl(bootp->PACKET.SIADDR, INADDR_ANY);
htonl(bootp->PACKET.GIADDR, INADDR_ANY);
_mem_zero(bootp->PACKET.CHADDR, sizeof(bootp->PACKET.CHADDR));
_mem_copy(if_ptr->DEV_ADDR, bootp->PACKET.CHADDR, if_ptr->DEV_ADDRLEN);
/* Start the retransmission timer to start sending immediately */
bootp->RESEND.TIME = 0;
bootp->RESEND.EVENT = BOOTP_send;
bootp->RESEND.PRIVATE = if_ptr;
TCPIP_Event_add(&bootp->RESEND);
if_ptr->BOOT = (pointer)parms;
} /* Endbody */
static void DHCPSRV_write_end
(
DHCPSRV_STATE_STRUCT_PTR state
)
{ /* Body */
uchar_ptr optptr;
volatile uint_32 optlen;
optlen = state->SND_BUFFER_LEN;
optptr = state->SND_BUFFER + optlen;
htonc(optptr, DHCPOPT_END);
optlen++;
state->SND_BUFFER_LEN = optlen;
} /* Endbody */
static void DHCPSRV_write_header
(
DHCPSRV_STATE_STRUCT_PTR state,
DHCPSRV_ADDR_STRUCT_PTR lease_ptr,
uint_32 lease_time,
uchar msgtype
)
{ /* Body */
DHCP_HEADER_PTR outp;
DHCP_HEADER_PTR inp;
uchar_ptr optptr;
volatile uint_32 optlen;
uint_32 temp_long;
uint_16 temp_short;
uchar temp_char;
outp = (DHCP_HEADER_PTR)state->SND_BUFFER;
inp = (DHCP_HEADER_PTR)state->RCV_BUFFER;
/* Build a DHCPOFFER, DHCPACK, or DHCPNAK packet */
htonc(outp->OP, DHCPOP_BOOTREPLY);
htonc(outp->HTYPE, ARPLINK_ETHERNET);
temp_char = ntohc(inp->HLEN);
htonc(outp->HLEN, temp_char);
htonc(outp->HOPS, 0);
/* Use client's existing transaction ID */
temp_long = ntohl(inp->XID);
htonl(outp->XID, temp_long);
htons(outp->SECS, 0);
if (ntohl(inp->GIADDR) == 0) {
htons(outp->FLAGS, 0);
} else {
temp_short = ntohs(inp->FLAGS);
htons(outp->FLAGS, temp_short);
} /* Endif */
if (msgtype == DHCPTYPE_DHCPOFFER) {
htonl(outp->CIADDR, 0);
} else {
temp_long = ntohl(inp->CIADDR);
htonl(outp->CIADDR, temp_long);
} /* Endif */
if (msgtype == DHCPTYPE_DHCPNAK) {
htonl(outp->YIADDR, 0);
htonl(outp->SIADDR, 0);
} else {
htonl(outp->YIADDR, lease_ptr->IP_ADDR);
htonl(outp->SIADDR, lease_ptr->OPTIONS->SADDR);
} /* Endif */
htonl(outp->GIADDR, 0);
_mem_copy(inp->CHADDR, outp->CHADDR, sizeof(outp->CHADDR));
if (msgtype == DHCPTYPE_DHCPNAK) {
_mem_zero(outp->SNAME, sizeof(outp->SNAME));
_mem_zero(outp->FILE, sizeof(outp->FILE));
} else {
_mem_copy(lease_ptr->OPTIONS->SNAME, outp->SNAME, sizeof(outp->SNAME));
_mem_copy(lease_ptr->OPTIONS->FILE, outp->FILE, sizeof(outp->FILE));
} /* Endif */
/*
** Fill in the required response options. These are message type,
** subnet mask, and server id.
*/
optlen = sizeof(DHCP_HEADER);
optptr = state->SND_BUFFER + optlen;
/* The Magic Cookie must always be the first thing in the OPTIONS */
htonl(optptr, DHCP_MAGIC);
optptr += DHCPSIZE_MAGIC;
optlen += DHCPSIZE_MAGIC;
#define DHCP_OPTION(type,len,val) \
htonc(optptr, DHCPOPT_ ## type); optptr++; optlen++; \
htonc(optptr, DHCPSIZE_ ## type); optptr++; optlen++; \
hton ## len(optptr, val); \
optptr += DHCPSIZE_ ## type; \
optlen += DHCPSIZE_ ## type
DHCP_OPTION(MSGTYPE, c, msgtype);
if (msgtype != DHCPTYPE_DHCPNAK) {
DHCP_OPTION(SERVERID, l, lease_ptr->OPTIONS->SERVERID);
DHCP_OPTION(MASK, l, lease_ptr->OPTIONS->MASK);
DHCP_OPTION(LEASE, l, lease_time);
} /* Endif */
state->SND_BUFFER_LEN = optlen;
} /* Endbody */
/*FUNCTION*-------------------------------------------------------------
*
* Function Name : ICMP6_send_echo
* Parameters :
*
* _ip_address ipaddress [IN] destination IP address
* uint_32 timeout [IN/OUT] timeout/rtt
* uint_16 id [IN] identification for echo message.
* uint_16 seq not used
*
* Comments :
* Send an ICMP Echo Request packet.
*
*END*-----------------------------------------------------------------*/
void ICMP6_send_echo(ICMP_ECHO_PARAM_PTR parms)
{
#if RTCSCFG_ENABLE_IP6
ICMP6_CFG_STRUCT_PTR ICMP6_cfg_ptr = RTCS_getcfg(ICMP6);
RTCSPCB_PTR pcb;
ICMP6_ECHO_HEADER_PTR packet;
_rtcs_if_handle ihandle_dest = NULL;
uint_32 error;
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.COMMON.ST_TX_TOTAL++);
parms->seq = ICMP6_cfg_ptr->ECHO_SEQ++;
pcb = RTCSPCB_alloc_send();
if (pcb == NULL)
{
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
RTCSCMD_complete(parms, RTCSERR_PCB_ALLOC);
return;
}
if(parms->ping_param->data_buffer && parms->ping_param->data_buffer_size)
{
error = RTCSPCB_append_fragment(pcb, parms->ping_param->data_buffer_size, parms->ping_param->data_buffer);
if (error)
{
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.COMMON.ST_TX_ERRORS++);
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
RTCSCMD_complete(parms, error);
return;
}
}
error = RTCSPCB_insert_header(pcb, sizeof(ICMP6_ECHO_HEADER));
if (error)
{
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.COMMON.ST_TX_ERRORS++);
IF_ICMP6_STATS_ENABLED(RTCS_seterror(&ICMP6_cfg_ptr->STATS.ERR_TX, error, (uint_32)pcb));
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
RTCSCMD_complete(parms, error);
return;
}
RTCSLOG_PCB_WRITE(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_ICMPV6), 0);
packet = (ICMP6_ECHO_HEADER_PTR)RTCSPCB_DATA(pcb);
pcb->TRANSPORT_LAYER = (uchar_ptr)packet;
htonc(packet->HEAD.TYPE, ICMP6_TYPE_ECHO_REQ);
htonc(packet->HEAD.CODE, 0);
htons(packet->HEAD.CHECKSUM, 0);
htons(packet->ID, parms->ping_param->id);
htons(packet->SEQ, parms->seq);
pcb->IP_SUM = IP_Sum_PCB(RTCSPCB_SIZE(pcb), pcb);
pcb->IP_SUM_PTR = packet->HEAD.CHECKSUM;
if(((sockaddr_in6 *)(&parms->ping_param->addr))->sin6_scope_id)
{
ihandle_dest = ip6_if_get_by_scope_id(((sockaddr_in6 *)(&parms->ping_param->addr))->sin6_scope_id);
}
parms->EXPIRE.TIME = parms->ping_param->timeout;
parms->EXPIRE.EVENT = ICMP6_expire_echo;
parms->EXPIRE.PRIVATE = parms;
parms->start_time = RTCS_time_get(); /* get timestamp */
error = IP6_send(pcb, IPPROTO_ICMPV6|IPTTL(parms->ping_param->hop_limit), NULL/*ipsrc*/, &((sockaddr_in6 *)(&parms->ping_param->addr))->sin6_addr/*ipdest*/, ihandle_dest, 0);
if (error != RTCS_OK)
{
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
RTCSCMD_complete(parms, error);
return;
}
/*
** If there is no error add the parm struct to config struct
** and initiate the event timer
*/
IF_ICMP6_STATS_ENABLED(ICMP6_cfg_ptr->STATS.ST_TX_ECHO_REQ++);
/* add the prameter structure to ICMP cfg */
parms->NEXT = ICMP6_cfg_ptr->ECHO_PARAM_HEAD;
if (parms->NEXT)
{
parms->NEXT->PREV = &parms->NEXT;
} /* Endif */
ICMP6_cfg_ptr->ECHO_PARAM_HEAD = parms;
parms->PREV = &ICMP6_cfg_ptr->ECHO_PARAM_HEAD;
TCPIP_Event_add(&parms->EXPIRE);
#else
RTCSCMD_complete(parms, RTCSERR_IP_IS_DISABLED);
#endif /* RTCSCFG_ENABLE_IP6 */
}
void ICMP_service
(
RTCSPCB_PTR pcb, /* [IN/OUT] incoming packet */
pointer dummy /* [IN] not used */
)
{ /* Body */
ICMP_CFG_STRUCT_PTR ICMP_cfg_ptr;
ICMP_HEADER_PTR packet;
_ip_address source, dest;
uint_32 error;
uint_16 chksum;
uchar type;
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 = 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 */
/*
** 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;
} /* Endif */
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 = ntohl(rdpacket->DATA);
origdest = ntohl(rdpacket->IP.DEST);
// If we receive a redirect to ourselves, silently discard it
if (IP_is_local(NULL, gateway)) {
IF_ICMP_STATS_ENABLED(ICMP_cfg_ptr->STATS.COMMON.ST_RX_DISCARDED++);
// Might want to add a counter here
} 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:
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, (uint_32)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, (uint_32)pcb));
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
return;
} /* Endif */
/* Change type from Echo to Echo Reply and recalculate checksum */
packet = (ICMP_HEADER_PTR)RTCSPCB_DATA(pcb);
htonc(packet->TYPE, ICMPTYPE_ECHO_REPLY);
htonc(packet->CODE, 0);
htons(packet->CHECKSUM, 0);
chksum = IP_Sum_PCB(0, pcb);
chksum = IP_Sum_invert(chksum);
htons(packet->CHECKSUM, chksum);
pcb->IP_SUM_PTR = NULL;
/* 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, 0);
pcb = NULL;
break;
case ICMPTYPE_ECHO_REPLY:
{ /* Scope */
ICMP_ECHO_HEADER_PTR echopacket = (ICMP_ECHO_HEADER_PTR)packet;
ICMP_PARM_PTR parms;
uint_16 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 = ntohs(echopacket->ID);
seq = ntohs(echopacket->SEQ);
/*
** Find a match for the ID and sequence number
*/
for (parms=ICMP_cfg_ptr->ECHO_PARM_HEAD; parms; parms=parms->NEXT) {
if ((parms->id == id) && (parms->seq == seq)) {
/* received reply for the ping request */
if (parms->NEXT) {
parms->NEXT->PREV = parms->PREV;
} /* Endif */
*parms->PREV = parms->NEXT;
TCPIP_Event_cancel(&parms->EXPIRE);
/* calculate round trip time */
parms->timeout = RTCS_timer_get_interval(parms->timeout, RTCS_time_get());
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;
uint_32 len, remain;
boolean discard = TRUE;
uchar 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)((uchar_ptr)packet + sizeof(ICMP_HEADER) + 4);
remain -= sizeof(ICMP_HEADER) + 4;
do {
/* Make sure the IP header is IP over IP */
if (ntohc(ip->PROTOCOL) != IPPROTO_IPIP) {
break;
} /* Endif */
/* Make sure we have a full IP header + 8 bytes */
len = (ntohc(ip->VERSLEN) & 0x0F) << 2;
if (remain < len + sizeof(IP_HEADER)) {
break;
} /* Endif */
/* Get next header */
ip = (IP_HEADER_PTR)((uchar_ptr)(ip) + len);
remain -= len;
source = ntohl(ip->SOURCE);
discard = IP_is_local(NULL, source);
} while(discard);
len = (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 = 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, 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 */
void ICMP_send_error_internal
(
uint_8 type, /* [IN] the type to send */
uint_8 code, /* [IN] the code to send */
uint_32 param, /* [IN] a parameter */
IP_HEADER_PTR iph, /* [IN] the IP header */
RTCSPCB_PTR origpcb, /* [IN] pcb with bad packet */
uint_32 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 = ntohl(iph->SOURCE);
_ip_address ipdst = ntohl(iph->DEST);
uint_16 iphdrlen = (ntohc(iph->VERSLEN) & 0x0F) << 2;
uint_16 ippktlen = ntohs(iph->LENGTH) - iphdrlen;
uint_16 checksum;
_ip_address icmpsrc = IP_is_local(NULL,ipdst) ? ipdst : INADDR_ANY;
uint_32 error;
uchar_ptr buffer;
uint_32 temp;
#if RTCSCFG_ENABLE_NAT
TCP_HEADER_PTR tcp_hdr;
UDP_HEADER_PTR udp_hdr;
IP_HEADER_PTR ip_hdr;
uint_32 protocol;
uint_16 src_port, dest_port;
uint_32 (_CODE_PTR_ _PTR_ nat_exec)(RTCSPCB_PTR _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 (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)((uchar_ptr)iph + iphdrlen);
if (!ICMPTYPE_ISQUERY(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, (uchar_ptr)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, (uint_32)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, (uint_32)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);
htonc(icmph->HEAD.TYPE, type);
htonc(icmph->HEAD.CODE, code);
htons(icmph->HEAD.CHECKSUM, 0);
htonl(icmph->DATA, param);
checksum = IP_Sum_PCB (0, pcb);
checksum = IP_Sum_invert(checksum);
htons(icmph->HEAD.CHECKSUM, 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 = 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)((uchar_ptr)ip_hdr + IPH_LEN(ip_hdr));
dest_port = ntohs(tcp_hdr->dest_port);
src_port = ntohs(tcp_hdr->source_port);
htons(tcp_hdr->dest_port, src_port);
htons(tcp_hdr->source_port, dest_port);
break;
case IPPROTO_UDP:
udp_hdr = (UDP_HEADER_PTR)((uchar_ptr)ip_hdr + IPH_LEN(ip_hdr));
dest_port = ntohs(udp_hdr->DEST_PORT);
src_port = ntohs(udp_hdr->SRC_PORT);
htons(udp_hdr->DEST_PORT, src_port);
htons(udp_hdr->SRC_PORT, dest_port);
break;
default:
// should not get here
break;
}
}
// swap IPs
ipsrc = ntohl(ip_hdr->SOURCE);
ipdst = ntohl(ip_hdr->DEST);
htonl(ip_hdr->SOURCE, ipdst);
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 = 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)((uchar_ptr)ip_hdr + IPH_LEN(ip_hdr));
dest_port = ntohs(tcp_hdr->dest_port);
src_port = ntohs(tcp_hdr->source_port);
htons(tcp_hdr->dest_port, src_port);
htons(tcp_hdr->source_port, dest_port);
break;
case IPPROTO_UDP:
udp_hdr = (UDP_HEADER_PTR)((uchar_ptr)ip_hdr + IPH_LEN(ip_hdr));
dest_port = ntohs(udp_hdr->DEST_PORT);
src_port = ntohs(udp_hdr->SRC_PORT);
htons(udp_hdr->DEST_PORT, src_port);
htons(udp_hdr->SRC_PORT, dest_port);
break;
default:
// should not get here
break;
}
}
// swap IPs
ipsrc = ntohl(ip_hdr->SOURCE);
ipdst = ntohl(ip_hdr->DEST);
htonl(ip_hdr->SOURCE, ipdst);
htonl(ip_hdr->DEST,ipsrc);
// Recalculate the cksum
htons(icmph->HEAD.CHECKSUM, 0);
checksum = IP_Sum_PCB (0, pcb);
checksum = IP_Sum_invert(checksum);
htons(icmph->HEAD.CHECKSUM, checksum);
// recalculate icmpsrc, and use new ipsrc.
ipdst = ntohl(ip_hdr->DEST);
ipsrc = 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 */
boolean IGMP_send_report
(
ip_mreq _PTR_ igrp,
uint_16 type
)
{ /* Body */
IGMP_CFG_STRUCT_PTR IGMP_cfg_ptr = RTCS_getcfg(IGMP);
uint_32 error;
uint_16 checksum;
RTCSPCB_PTR pcb;
IGMP_HEADER_PTR header;
IP_IF_PTR ipif;
_ip_address ipdst;
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_TX_TOTAL++);
/* never send a report for the local groups */
if (IN_LOCAL_MULTICAST(igrp->imr_multiaddr.s_addr)) {
return TRUE;
} /* Endif */
/* get the interface with its ip address */
ipif = IP_find_if(igrp->imr_interface.s_addr);
if (ipif == NULL) {
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
return FALSE;
} /* Endif */
pcb = RTCSPCB_alloc_send();
if (pcb == NULL) {
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
return FALSE;
} /* Endif */
//RTCSLOG_PCB_ALLOC(pcb);
error = RTCSPCB_insert_header(pcb, sizeof(IGMP_HEADER));
if (error) {
RTCSLOG_PCB_FREE(pcb, error);
RTCSPCB_free(pcb);
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.COMMON.ST_TX_MISSED++);
return FALSE;
} /* Endif */
RTCSLOG_PCB_WRITE(pcb, RTCS_LOGCTRL_PROTO(IPPROTO_IGMP), 1);
#ifdef IGMP_V2
/* check if routers igmpv1 are present or not */
if (type == IGMPTYPE_V2_REPORT && ipif->IGMP_V1_ROUTER_FLAG) {
uint_32 curTime = RTCS_time_get();
/* WORK: handle the overflow (see tcp seq) */
if (curTime < ipif->IGMP_V1_ROUTER_TIMEOUT) {
type = IGMPTYPE_V1_REPORT;
} else {
/* if the timeout expired, clear the flag */
ipif->IGMP_V1_ROUTER_FLAG = 0;
} /* Endif */
} /* Endif */
#endif /* IGMP_V2 */
/* build the igmp packet */
header = (IGMP_HEADER_PTR)RTCSPCB_DATA(pcb);
htonc(header->TYPE, type);
htonc(header->MAX_RESP_TIME, 0);
htons(header->CHECKSUM, 0);
htonl(header->GROUP_ADDRESS, igrp->imr_multiaddr.s_addr);
checksum = _mem_sum_ip(0, sizeof(IGMP_HEADER), header);
checksum = IP_Sum_invert(checksum);
htons(header->CHECKSUM, checksum);
/* WORK: for IGMP_V2, add a router alert option but currently ip layer doesnt support ip options */
/* send the igmp packet */
ipdst = igrp->imr_multiaddr.s_addr;
#ifdef IGMP_V2
if (type == IGMPTYPE_LEAVE) {
ipdst = INADDR_ALLROUTERS_GROUP;
} /* Endif */
#endif
IF_IGMP_STATS_ENABLED(IGMP_cfg_ptr->STATS.ST_TX_REPORT++); /* WORK: not always true for IGMP_V2 */
error = IP_send(pcb, IPPROTO_IGMP | IPTTL(1), igrp->imr_interface.s_addr, ipdst, RTCS_MSG_NOLOOP);
return TRUE;
} /* Endbody */
