/**
* \brief Get Neighbor_AO by IP Address and send an ICMPv6 Echo Request
*
* \param destination ip address
*/
void uip_icmp6_echo_request_output(uip_ipaddr_t * dst)
{
Neighbor_AO * neighbor;
neighbor = uip_nd6_nbrcache_lookup(dst);
if (NULL != neighbor)
uip_icmp6_echo_request_output_to_neighbor(neighbor);
}
/**
* \brief handle incoming echo request
*
* \param the incoming NewDataEvent
*/
void uip_icmp6_echo_request_input(NewDataEvent * e)
{
struct uip_icmp_hdr * icmp_hdr;
struct uip_tcpip_hdr * tcpip_hdr;
Neighbor_AO * neighbor;
static QEvent const pr_sig = { PACKET_RECEIVED_SIG};
static QEvent const ps_sig = { PACKET_SENT_SIG};
tcpip_hdr = ( struct uip_tcpip_hdr *) &e->buf[UIP_LLH_LEN];
icmp_hdr = (struct uip_icmp_hdr *)&e->buf[uip_l2_l3_hdr_len];
neighbor = uip_nd6_nbrcache_lookup(&tcpip_hdr->srcipaddr);
if (NULL != neighbor)
QActive_postFIFO((QActive *)neighbor, &pr_sig);
switch_eth_addr(e);
memcpy(&tcpip_hdr->destipaddr, &tcpip_hdr->srcipaddr, sizeof(uip_ipaddr_t));
memcpy(&tcpip_hdr->srcipaddr, &uip_hostaddr, sizeof(uip_ipaddr_t));
icmp_hdr->type = ICMP6_ECHO_REPLY;
icmp_hdr->icode = 0;
icmp_hdr->icmpchksum = 0;
icmp_hdr->icmpchksum = ~upper_layer_chksum6((unsigned char *) &e->buf);
e->super.sig = SEND_DATA_SIG;
QF_publish((QEvent *) e);
QActive_postFIFO((QActive *)neighbor, &ps_sig);
}
/**
* \brief Reply incoming ICMPv6 Echo Request with an Echo Reply
*
* \param incoming NewDataEvent
*/
void uip_icmp6_echo_reply_input(NewDataEvent * e)
{
Neighbor_AO * neighbor;
struct uip_icmpip_hdr * icmpip_hdr;
static QEvent const icmpr_sig = { ICMPV6_ECHO_REPLY_SIG};
icmpip_hdr = ( struct uip_icmpip_hdr *) &e->buf[UIP_LLH_LEN];
neighbor = uip_nd6_nbrcache_lookup(&icmpip_hdr->srcipaddr);
if (NULL != neighbor)
QActive_postFIFO((QActive *)neighbor, &icmpr_sig);
}
/*------------------------------------------------------------------*/
void
uip_nd6_io_ns_input(void)
{
PRINTF("Received NS from");
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF("to");
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
PRINTF("with target address");
PRINT6ADDR((uip_ipaddr_t *)(&UIP_ND6_NS_BUF->tgtipaddr));
PRINTF("\n");
UIP_STAT(++uip_stat.nd6.recv);
u8_t flags;
#if UIP_CONF_IPV6_CHECKS
if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) ||
(uip_is_addr_mcast(&UIP_ND6_NS_BUF->tgtipaddr)) ||
(UIP_ICMP_BUF->icode != 0))
{
goto badpkt;
}
#endif /* UIP_CONF_IPV6_CHECKS */
/* Options reading: we handle only SLLAO for now */
nd6_opt_llao = NULL;
nd6_opt_offset = UIP_ND6_NS_LEN;
while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) {
#if UIP_CONF_IPV6_CHECKS
if(UIP_ND6_OPT_HDR_BUF->len == 0) {
goto badpkt;
}
#endif /* UIP_CONF_IPV6_CHECKS */
switch(UIP_ND6_OPT_HDR_BUF->type) {
case UIP_ND6_OPT_SLLAO:
nd6_opt_llao = (struct uip_nd6_opt_llao *)UIP_ND6_OPT_HDR_BUF;
break;
default:
UIP_LOG("ND option not supported in NS");
break;
}
nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3);
}
/* Options processing: only SLLAO */
if(nd6_opt_llao != NULL) {
#if UIP_CONF_IPV6_CHECKS
/* There must be NO option in a DAD NS */
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)) {
goto badpkt;
} else {
#endif /*UIP_CONF_IPV6_CHECKS*/
neighbor = uip_nd6_nbrcache_lookup(&UIP_IP_BUF->srcipaddr);
if(neighbor == NULL) {
/* we need to add the neighbor*/
uip_nd6_nbrcache_add(&UIP_IP_BUF->srcipaddr,
&nd6_opt_llao->addr, 0, STALE);
} else {
/* If LL address changed, set neighbor state to stale */
if(memcmp(&nd6_opt_llao->addr, &neighbor->lladdr, UIP_LLADDR_LEN) != 0) {
memcpy(&neighbor->lladdr, &nd6_opt_llao->addr, UIP_LLADDR_LEN);
neighbor->state = STALE;
} else {
/* If neighbor state is INCOMPLETE, set to STALE */
if(neighbor->state == INCOMPLETE) {
neighbor->state = STALE;
}
}
}
#if UIP_CONF_IPV6_CHECKS
}
#endif /*UIP_CONF_IPV6_CHECKS*/
}
/*
* Rest of NS processing: Depends on the purpose of the NS: NUD or DAD or
* Address Resolution
*/
/** \note we use ifaddr to remember the target address */
ifaddr = uip_netif_addr_lookup(&UIP_ND6_NS_BUF->tgtipaddr, 128, 0);
if(ifaddr != NULL) {
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)){
/* DAD CASE */
#if UIP_CONF_IPV6_CHECKS
/* Dst address must be solicited node mcast address */
if(!uip_netif_is_addr_my_solicited(&UIP_IP_BUF->destipaddr)){
goto badpkt;
}
#endif /* UIP_CONF_IPV6_CHECKS */
/*
* If my address is not tentative, then send a NA to all nodes with
* TLLAO flags are: override = yes.
*/
if(ifaddr->state!=TENTATIVE) {
/*
* we need to send a NA, we set the src, dest, flags. tgt remains the
* same and the rest is done at "create_na"
*/
uip_create_linklocal_allnodes_mcast(&UIP_IP_BUF->destipaddr);
uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
flags = UIP_ND6_NA_FLAG_OVERRIDE;
goto create_na;
} else {
/** \todo if I sent a NS before him, I win */
uip_netif_dad_failed(&UIP_ND6_NS_BUF->tgtipaddr);
goto discard;
}
}
#if UIP_CONF_IPV6_CHECKS
/* Duplicate check */
if(uip_netif_is_addr_my_unicast(&UIP_IP_BUF->srcipaddr)) {
/**
* \NOTE do we do something here? we both are using the same address.
* If we are doing dad, we could cancel it, though we should receive a
* NA in response of DAD NS we sent, hence DAD will fail anyway. If we
* were not doing DAD, it means there is a duplicate in the network!
*/
goto badpkt;
}
#endif /*UIP_CONF_IPV6_CHECKS*/
/* Address resolution case */
if(uip_netif_is_addr_my_solicited(&UIP_IP_BUF->destipaddr)){
/*
* we need to send a NA, we set the src, dest, flags. The rest is
* set at the "create_na" label.
*/
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_ND6_NS_BUF->tgtipaddr);
flags = UIP_ND6_NA_FLAG_SOLICITED | UIP_ND6_NA_FLAG_OVERRIDE;
goto create_na;
}
/*
* NUD CASE. at this point the packet must be for us! we check this,
* and at the same time if target == dest
*/
if(uip_netif_addr_lookup(&UIP_IP_BUF->destipaddr, 128, 0) == ifaddr){
/*
* we need to send a NA, we set the src, dest, flags. The rest is set
* at the "create_na" label.
*/
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_ND6_NS_BUF->tgtipaddr);
flags = UIP_ND6_NA_FLAG_SOLICITED | UIP_ND6_NA_FLAG_OVERRIDE;
goto create_na;
} else {
#if UIP_CONF_IPV6_CHECKS
goto badpkt;
#endif /* UIP_CONF_IPV6_CHECKS */
}
} else {
goto discard;
}
create_na:
/*
* Fill the part of the NA which is common to all NAs. If the NS contained
* extension headers, we must set the target address properly
*/
uip_ext_len = 0;
/* IP header */
UIP_IP_BUF->vtc = 0x60;
UIP_IP_BUF->tcflow = 0;
UIP_IP_BUF->flow = 0;
UIP_IP_BUF->len[0] = 0; /* length will not be more than 255 */
UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_NA_LEN + UIP_ND6_OPT_LLAO_LEN;
UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
UIP_IP_BUF->ttl = UIP_ND6_HOP_LIMIT;
/* ICMP header */
UIP_ICMP_BUF->type = ICMP6_NA;
UIP_ICMP_BUF->icode = 0;
/* NA static part */
UIP_ND6_NA_BUF->flagsreserved = flags;
memcpy(&UIP_ND6_NA_BUF->tgtipaddr, &ifaddr->ipaddr, sizeof(uip_ipaddr_t));
/* NA option: TLLAO. note that length field is in unit of 8 bytes */
uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + UIP_ND6_NA_LEN + UIP_ND6_OPT_LLAO_LEN;
nd6_opt_llao = (struct uip_nd6_opt_llao *)&uip_buf[uip_l2_l3_icmp_hdr_len + UIP_ND6_NA_LEN];
nd6_opt_llao->type = UIP_ND6_OPT_TLLAO;
nd6_opt_llao->len = UIP_ND6_OPT_LLAO_LEN >> 3;
memcpy(&(nd6_opt_llao->addr), &uip_lladdr, UIP_LLADDR_LEN);
/* padding if needed */
memset((void *)(&nd6_opt_llao->addr) + UIP_LLADDR_LEN, 0, UIP_ND6_OPT_LLAO_LEN - 2 - UIP_LLADDR_LEN);
/*ICMP checksum*/
UIP_ICMP_BUF->icmpchksum = 0;
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
UIP_STAT(++uip_stat.nd6.sent);
PRINTF("Sending NA to");
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
PRINTF("from");
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF("with target address");
PRINT6ADDR(&UIP_ND6_NA_BUF->tgtipaddr);
PRINTF("\n");
return;
#if UIP_CONF_IPV6_CHECKS
badpkt:
UIP_STAT(++uip_stat.nd6.drop);
UIP_LOG("NS received is bad");
#endif /* UIP_CONF_IPV6_CHECKS */
discard:
uip_len = 0;
return;
}
void
tcpip_ipv6_output(void)
{
struct uip_nd6_neighbor *nbc = NULL;
struct uip_nd6_defrouter *dr = NULL;
if(uip_len == 0)
return;
if(uip_len > UIP_LINK_MTU){
UIP_LOG("tcpip_ipv6_output: Packet to big");
uip_len = 0;
return;
}
if(uip_is_addr_unspecified(&UIP_IP_BUF->destipaddr)){
UIP_LOG("tcpip_ipv6_output: Destination address unspecified");
uip_len = 0;
return;
}
if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
/*If destination is on link */
nbc = NULL;
if(uip_nd6_is_addr_onlink(&UIP_IP_BUF->destipaddr)){
nbc = uip_nd6_nbrcache_lookup(&UIP_IP_BUF->destipaddr);
} else {
#if UIP_CONF_ROUTER
/*destination is not on link*/
uip_ipaddr_t ipaddr;
uip_ipaddr_t *next_hop;
/* Try to find the next hop address in the local routing table. */
next_hop = uip_router != NULL ?
uip_router->lookup(&UIP_IP_BUF->destipaddr, &ipaddr) : NULL;
if(next_hop != NULL) {
/* Look for the next hop of the route in the neighbor cache.
Add a cache entry if we can't find it. */
nbc = uip_nd6_nbrcache_lookup(next_hop);
if(nbc == NULL) {
nbc = uip_nd6_nbrcache_add(next_hop, NULL, 1, NO_STATE);
}
} else {
#endif /* UIP_CONF_ROUTER */
/* No route found, check if a default router exists and use it then. */
dr = uip_nd6_choose_defrouter();
if(dr != NULL){
nbc = dr->nb;
} else {
/* shall we send a icmp error message destination unreachable ?*/
UIP_LOG("tcpip_ipv6_output: Destination off-link but no router");
uip_len = 0;
return;
}
#if UIP_CONF_ROUTER
}
#endif /* UIP_CONF_ROUTER */
}
/* there are two cases where the entry logically does not exist:
* 1 it really does not exist. 2 it is in the NO_STATE state */
if (nbc == NULL || nbc->state == NO_STATE) {
if (nbc == NULL) {
/* create neighbor cache entry, original packet is replaced by NS*/
nbc = uip_nd6_nbrcache_add(&UIP_IP_BUF->destipaddr, NULL, 0, INCOMPLETE);
} else {
nbc->state = INCOMPLETE;
}
#if UIP_CONF_IPV6_QUEUE_PKT
/* copy outgoing pkt in the queuing buffer for later transmmit */
memcpy(nbc->queue_buf, UIP_IP_BUF, uip_len);
nbc->queue_buf_len = uip_len;
#endif
/* RFC4861, 7.2.2:
* "If the source address of the packet prompting the solicitation is the
* same as one of the addresses assigned to the outgoing interface, that
* address SHOULD be placed in the IP Source Address of the outgoing
* solicitation. Otherwise, any one of the addresses assigned to the
* interface should be used."*/
if(uip_netif_is_addr_my_unicast(&UIP_IP_BUF->srcipaddr)){
uip_nd6_io_ns_output(&UIP_IP_BUF->srcipaddr, NULL, &nbc->ipaddr);
} else {
uip_nd6_io_ns_output(NULL, NULL, &nbc->ipaddr);
}
stimer_set(&(nbc->last_send),
uip_netif_physical_if.retrans_timer / 1000);
nbc->count_send = 1;
} else {
if (nbc->state == INCOMPLETE){
PRINTF("tcpip_ipv6_output: neighbor cache entry incomplete\n");
#if UIP_CONF_IPV6_QUEUE_PKT
/* copy outgoing pkt in the queuing buffer for later transmmit and set
the destination neighbor to nbc */
memcpy(nbc->queue_buf, UIP_IP_BUF, uip_len);
nbc->queue_buf_len = uip_len;
uip_len = 0;
#endif /*UIP_CONF_IPV6_QUEUE_PKT*/
return;
}
/* if running NUD (nbc->state == STALE, DELAY, or PROBE ) keep
sending in parallel see rfc 4861 Node behavior in section 7.7.3*/
if (nbc->state == STALE){
nbc->state = DELAY;
stimer_set(&(nbc->reachable),
UIP_ND6_DELAY_FIRST_PROBE_TIME);
PRINTF("tcpip_ipv6_output: neighbor cache entry stale moving to delay\n");
}
stimer_set(&(nbc->last_send),
uip_netif_physical_if.retrans_timer / 1000);
tcpip_output(&(nbc->lladdr));
#if UIP_CONF_IPV6_QUEUE_PKT
/* Send the queued packets from here, may not be 100% perfect though.
* This happens in a few cases, for example when instead of receiving a
* NA after sendiong a NS, you receive a NS with SLLAO: the entry moves
*to STALE, and you must both send a NA and the queued packet
*/
if(nbc->queue_buf_len != 0) {
uip_len = nbc->queue_buf_len;
memcpy(UIP_IP_BUF, nbc->queue_buf, uip_len);
nbc->queue_buf_len = 0;
tcpip_output(&(nbc->lladdr));
}
#endif /*UIP_CONF_IPV6_QUEUE_PKT*/
uip_len = 0;
return;
}
}
/*multicast IP destination address */
tcpip_output(NULL);
uip_len = 0;
uip_ext_len = 0;
}