void
rpl_update_header_empty(void)
{
rpl_instance_t *instance;
int uip_ext_opt_offset;
int last_uip_ext_len;
last_uip_ext_len = uip_ext_len;
uip_ext_len = 0;
uip_ext_opt_offset = 2;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto) {
case UIP_PROTO_HBHO:
if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
uip_ext_len = last_uip_ext_len;
return;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if(instance == NULL || !instance->used || !instance->current_dag->joined) {
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
return;
}
break;
default:
PRINTF("RPL: No hop-by-hop option found, creating it\n");
if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE) {
PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
uip_ext_len = last_uip_ext_len;
return;
}
set_rpl_opt(uip_ext_opt_offset);
uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
return;
}
switch(UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=instance->current_dag->rank;
uip_ext_len = last_uip_ext_len;
return;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len = last_uip_ext_len;
return;
}
}
/*---------------------------------------------------------------------------*/
void
rpl_update_header_empty(void)
{
rpl_instance_t *instance;
int uip_ext_opt_offset;
int last_uip_ext_len;
last_uip_ext_len = uip_ext_len;
uip_ext_len = 0;
uip_ext_opt_offset = 2;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto) {
case UIP_PROTO_HBHO:
if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
uip_ext_len = last_uip_ext_len;
return;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if(instance == NULL || !instance->used || !instance->current_dag->joined) {
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
return;
}
break;
default:
PRINTF("RPL: No hop-by-hop option found, creating it\n");
if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE) {
PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
uip_ext_len = last_uip_ext_len;
return;
}
set_rpl_opt(uip_ext_opt_offset);
uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
return;
}
switch(UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = instance->current_dag->rank;
/* Check the direction of the down flag, as per Section 11.2.2.3,
which states that if a packet is going down it should in
general not go back up again. If this happens, a
RPL_HDR_OPT_FWD_ERR should be flagged. */
if((UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_DOWN)) {
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_FWD_ERR;
PRINTF("RPL forwarding error\n");
}
} else {
/* Set the down extension flag correctly as described in Section
11.2 of RFC6550. If the packet progresses along a DAO route,
the down flag should be set. */
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
/* No route was found, so this packet will go towards the RPL
root. If so, we should not set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_DOWN;
PRINTF("RPL option going up\n");
} else {
/* A DAO route was found so we set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN;
PRINTF("RPL option going down\n");
}
}
uip_ext_len = last_uip_ext_len;
return;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len = last_uip_ext_len;
return;
}
}
/*---------------------------------------------------------------------------*/
int
rpl_update_header_empty(void)
{
rpl_instance_t *instance;
int uip_ext_opt_offset;
int last_uip_ext_len;
rpl_parent_t *parent;
last_uip_ext_len = uip_ext_len;
uip_ext_len = 0;
uip_ext_opt_offset = 2;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto) {
case UIP_PROTO_HBHO:
if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
PRINTF("RPL: Hop-by-hop extension header has wrong size\n");
uip_ext_len = last_uip_ext_len;
return 0;
}
if(UIP_EXT_HDR_OPT_RPL_BUF->opt_type != UIP_EXT_HDR_OPT_RPL) {
PRINTF("RPL: Non RPL Hop-by-hop option support not implemented\n");
uip_ext_len = last_uip_ext_len;
return 0;
}
if(UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) {
PRINTF("RPL: RPL Hop-by-hop option has wrong length\n");
uip_ext_len = last_uip_ext_len;
return 0;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if(instance == NULL || !instance->used || !instance->current_dag->joined) {
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
return 0;
}
break;
default:
#if RPL_INSERT_HBH_OPTION
PRINTF("RPL: No hop-by-hop option found, creating it\n");
if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE - UIP_LLH_LEN) {
PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
uip_ext_len = last_uip_ext_len;
return 0;
}
set_rpl_opt(uip_ext_opt_offset);
uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
#endif
return 0;
}
switch(UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = UIP_HTONS(instance->current_dag->rank);
/* Check the direction of the down flag, as per Section 11.2.2.3,
which states that if a packet is going down it should in
general not go back up again. If this happens, a
RPL_HDR_OPT_FWD_ERR should be flagged. */
if((UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_DOWN)) {
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_FWD_ERR;
PRINTF("RPL forwarding error\n");
/* We should send back the packet to the originating parent,
but it is not feasible yet, so we send a No-Path DAO instead */
PRINTF("RPL generate No-Path DAO\n");
parent = rpl_get_parent((uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER));
if(parent != NULL) {
dao_output_target(parent, &UIP_IP_BUF->destipaddr, RPL_ZERO_LIFETIME);
}
/* Drop packet */
return 1;
}
} else {
/* Set the down extension flag correctly as described in Section
11.2 of RFC6550. If the packet progresses along a DAO route,
the down flag should be set. */
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
/* No route was found, so this packet will go towards the RPL
root. If so, we should not set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_DOWN;
PRINTF("RPL option going up\n");
} else {
/* A DAO route was found so we set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN;
PRINTF("RPL option going down\n");
}
}
uip_ext_len = last_uip_ext_len;
return 0;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len = last_uip_ext_len;
return 0;
}
}