static void test_pkt_len__2_elem__overflow(void)
{
ng_pktsnip_t snip1 = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
ng_pktsnip_t snip2 = _INIT_ELEM(SIZE_MAX, NULL, &snip1);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8) - 1, ng_pkt_len(&snip2));
/* size should overflow */
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), ng_pkt_len(&snip1));
}
static void test_pkt_len__2_elem(void)
{
ng_pktsnip_t snip1 = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
ng_pktsnip_t snip2 = _INIT_ELEM_STATIC_DATA(TEST_STRING12, &snip1);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8) + sizeof(TEST_STRING12),
ng_pkt_len(&snip2));
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), ng_pkt_len(&snip1));
}
static void _send(ng_pktsnip_t *pkt)
{
ng_udp_hdr_t *hdr;
ng_pktsnip_t *udp_snip;
ng_netreg_entry_t *sendto;
/* get udp snip and hdr */
LL_SEARCH_SCALAR(pkt, udp_snip, type, NG_NETTYPE_UDP);
udp_snip = ng_pktbuf_start_write(udp_snip);
if (udp_snip == NULL) {
DEBUG("udp: cannot send packet: unable to allocate packet\n");
ng_pktbuf_release(pkt);
return;
}
hdr = (ng_udp_hdr_t *)udp_snip->data;
/* fill in size field */
hdr->length = byteorder_htons(ng_pkt_len(udp_snip));
/* and forward packet to the network layer */
sendto = ng_netreg_lookup(pkt->type, NG_NETREG_DEMUX_CTX_ALL);
/* throw away packet if no one is interested */
if (sendto == NULL) {
DEBUG("udp: cannot send packet: network layer not found\n");
ng_pktbuf_release(pkt);
return;
}
/* send packet to network layer */
ng_pktbuf_hold(pkt, ng_netreg_num(pkt->type, NG_NETREG_DEMUX_CTX_ALL) - 1);
while (sendto != NULL) {
ng_netapi_send(sendto->pid, pkt);
sendto = ng_netreg_getnext(sendto);
}
}
/**
* @brief Make a raw dump of the given packet contents
*/
void dump_pkt(ng_pktsnip_t *pkt)
{
ng_pktsnip_t *snip = pkt;
printf("rftest-rx --- len 0x%02x lqi 0x%02x rx_time 0x%08lx\n\n",
ng_pkt_len(pkt), 0, hwtimer_now());
while (snip) {
for (size_t i = 0; i < snip->size; i++) {
printf("0x%02x ", ((uint8_t *)(snip->data))[i]);
}
snip = snip->next;
}
puts("\n");
ng_pktbuf_release(pkt);
}
static int _fill_ipv6_hdr(kernel_pid_t iface, ng_pktsnip_t *ipv6,
ng_pktsnip_t *payload)
{
int res;
ng_ipv6_hdr_t *hdr = ipv6->data;
hdr->len = byteorder_htons(ng_pkt_len(payload));
DEBUG("ipv6: set payload length to %zu (network byteorder %04" PRIx16 ")\n",
ng_pkt_len(payload), hdr->len.u16);
/* check if e.g. extension header was not already marked */
if (hdr->nh == NG_PROTNUM_RESERVED) {
hdr->nh = ng_nettype_to_protnum(payload->type);
/* if still reserved: mark no next header */
if (hdr->nh == NG_PROTNUM_RESERVED) {
hdr->nh = NG_PROTNUM_IPV6_NONXT;
}
}
DEBUG("ipv6: set next header to %" PRIu8 "\n", hdr->nh);
if (hdr->hl == 0) {
hdr->hl = ng_ipv6_netif_get(iface)->cur_hl;
}
if (ng_ipv6_addr_is_unspecified(&hdr->src)) {
ng_ipv6_addr_t *src = ng_ipv6_netif_find_best_src_addr(iface, &hdr->dst);
if (src != NULL) {
DEBUG("ipv6: set packet source to %s\n",
ng_ipv6_addr_to_str(addr_str, src, sizeof(addr_str)));
memcpy(&hdr->src, src, sizeof(ng_ipv6_addr_t));
}
/* Otherwise leave unspecified */
}
DEBUG("ipv6: calculate checksum for upper header.\n");
#if NG_NETIF_NUMOF > 1
if (payload->users > 1) {
ng_pktsnip_t *ptr = ipv6;
/* We deal with multiple interfaces here (multicast) => possible
* different source addresses => duplication of payload needed */
while (ptr != payload->next) {
ng_pktsnip_t *old = ptr->next;
/* duplicate everything including payload */
ptr->next = ng_pktbuf_start_write(ptr->next);
if (ptr->next == NULL) {
DEBUG("ipv6: unable to get write access to payload, drop it\n");
return -ENOBUFS;
}
ptr = old;
}
}
#endif /* NG_NETIF_NUMOF */
if ((res = ng_netreg_calc_csum(payload, ipv6)) < 0) {
if (res != -ENOENT) { /* if there is no checksum we are okay */
DEBUG("ipv6: checksum calculation failed.\n");
return res;
}
}
return 0;
}
static void test_pkt_len__1_elem__size_data(void)
{
ng_pktsnip_t snip = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), ng_pkt_len(&snip));
}
static void test_pkt_len__1_elem__size_0(void)
{
ng_pktsnip_t snip = _INIT_ELEM(0, NULL, NULL);
TEST_ASSERT_EQUAL_INT(0, ng_pkt_len(&snip));
}
static void test_pkt_len__NULL(void)
{
TEST_ASSERT_EQUAL_INT(0, ng_pkt_len(NULL));
}
static void _send(ng_pktsnip_t *pkt, bool prep_hdr)
{
kernel_pid_t iface = KERNEL_PID_UNDEF;
ng_pktsnip_t *ipv6, *payload;
ng_ipv6_addr_t *tmp;
ng_ipv6_hdr_t *hdr;
/* get IPv6 snip and (if present) generic interface header */
if (pkt->type == NG_NETTYPE_NETIF) {
/* If there is already a netif header (routing protocols and
* neighbor discovery might add them to preset sending interface) */
iface = ((ng_netif_hdr_t *)pkt->data)->if_pid;
/* seize payload as temporary variable */
ipv6 = ng_pktbuf_start_write(pkt); /* write protect for later removal
* in _send_unicast() */
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to netif header, dropping packet\n");
ng_pktbuf_release(pkt);
return;
}
pkt = ipv6; /* Reset pkt from temporary variable */
ipv6 = pkt->next;
}
else {
ipv6 = pkt;
}
/* seize payload as temporary variable */
payload = ng_pktbuf_start_write(ipv6);
if (payload == NULL) {
DEBUG("ipv6: unable to get write access to IPv6 header, dropping packet\n");
ng_pktbuf_release(pkt);
return;
}
if (ipv6 != pkt) { /* in case packet has netif header */
pkt->next = payload;/* pkt is already write-protected so we can do that */
}
ipv6 = payload; /* Reset ipv6 from temporary variable */
hdr = ipv6->data;
payload = ipv6->next;
if (ng_ipv6_addr_is_multicast(&hdr->dst)) {
_send_multicast(iface, pkt, ipv6, payload, prep_hdr);
}
else if ((ng_ipv6_addr_is_loopback(&hdr->dst)) || /* dst is loopback address */
((iface == KERNEL_PID_UNDEF) && /* or dst registered to any local interface */
((iface = ng_ipv6_netif_find_by_addr(&tmp, &hdr->dst)) != KERNEL_PID_UNDEF)) ||
((iface != KERNEL_PID_UNDEF) && /* or dst registered to given interface */
(ng_ipv6_netif_find_addr(iface, &hdr->dst) != NULL))) {
uint8_t *rcv_data;
ng_pktsnip_t *ptr = ipv6, *rcv_pkt;
if (prep_hdr) {
if (_fill_ipv6_hdr(iface, ipv6, payload) < 0) {
/* error on filling up header */
ng_pktbuf_release(pkt);
return;
}
}
rcv_pkt = ng_pktbuf_add(NULL, NULL, ng_pkt_len(ipv6), NG_NETTYPE_IPV6);
if (rcv_pkt == NULL) {
DEBUG("ipv6: error on generating loopback packet\n");
ng_pktbuf_release(pkt);
return;
}
rcv_data = rcv_pkt->data;
/* "reverse" packet (by making it one snip as if received from NIC) */
while (ptr != NULL) {
memcpy(rcv_data, ptr->data, ptr->size);
rcv_data += ptr->size;
ptr = ptr->next;
}
ng_pktbuf_release(pkt);
DEBUG("ipv6: packet is addressed to myself => loopback\n");
ng_netapi_receive(ng_ipv6_pid, rcv_pkt);
}
else {
uint8_t l2addr_len = NG_IPV6_NC_L2_ADDR_MAX;
uint8_t l2addr[l2addr_len];
iface = _next_hop_l2addr(l2addr, &l2addr_len, iface, &hdr->dst, pkt);
if (iface == KERNEL_PID_UNDEF) {
DEBUG("ipv6: error determining next hop's link layer address\n");
ng_pktbuf_release(pkt);
return;
}
if (prep_hdr) {
if (_fill_ipv6_hdr(iface, ipv6, payload) < 0) {
/* error on filling up header */
ng_pktbuf_release(pkt);
return;
}
}
_send_unicast(iface, l2addr, l2addr_len, pkt);
}
}
static void _send(ng_pktsnip_t *pkt)
{
ng_netif_hdr_t *hdr;
ng_pktsnip_t *ipv6, *sixlowpan;
ng_sixlowpan_netif_t *iface;
/* cppcheck: datagram_size will be read by frag */
/* cppcheck-suppress unreadVariable */
size_t payload_len, datagram_size;
uint16_t max_frag_size;
/* cppcheck: disp is needed in other build paths on this level already */
/* cppcheck-suppress variableScope */
uint8_t *disp;
if ((pkt == NULL) || (pkt->size < sizeof(ng_netif_hdr_t))) {
DEBUG("6lo: Sending packet has no netif header\n");
ng_pktbuf_release(pkt);
return;
}
hdr = pkt->data;
ipv6 = pkt->next;
if ((ipv6 == NULL) || (ipv6->type != NG_NETTYPE_IPV6)) {
DEBUG("6lo: Sending packet has no IPv6 header\n");
ng_pktbuf_release(pkt);
return;
}
/* payload length and datagram size are different in that the payload
* length is the length of the IPv6 datagram + 6LoWPAN dispatches,
* while the datagram size is the size of only the IPv6 datagram */
payload_len = ng_pkt_len(ipv6);
/* cppcheck: datagram_size will be read by ng_sixlowpan_frag implementation */
/* cppcheck-suppress unreadVariable */
datagram_size = (uint16_t)payload_len;
/* use sixlowpan packet snip as temporary one */
sixlowpan = ng_pktbuf_start_write(pkt);
if (sixlowpan == NULL) {
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt);
return;
}
pkt = sixlowpan;
iface = ng_sixlowpan_netif_get(hdr->if_pid);
if (iface == NULL) {
if (ng_netapi_get(hdr->if_pid, NETCONF_OPT_MAX_PACKET_SIZE,
0, &max_frag_size, sizeof(max_frag_size)) < 0) {
/* if error we assume it works */
DEBUG("6lo: can not get max packet size from interface %"
PRIkernel_pid "\n", hdr->if_pid);
max_frag_size = UINT16_MAX;
}
ng_sixlowpan_netif_add(hdr->if_pid, max_frag_size);
iface = ng_sixlowpan_netif_get(hdr->if_pid);
}
else {
max_frag_size = iface->max_frag_size;
}
#ifdef MODULE_NG_SIXLOWPAN_IPHC
if (iface->iphc_enabled) {
if (!ng_sixlowpan_iphc_encode(pkt)) {
DEBUG("6lo: error on IPHC encoding\n");
ng_pktbuf_release(pkt);
return;
}
}
else {
DEBUG("6lo: Send uncompressed\n");
sixlowpan = ng_pktbuf_add(NULL, NULL, sizeof(uint8_t),
NG_NETTYPE_SIXLOWPAN);
if (sixlowpan == NULL) {
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt);
return;
}
sixlowpan->next = ipv6;
pkt->next = sixlowpan;
disp = sixlowpan->data;
disp[0] = NG_SIXLOWPAN_UNCOMPRESSED;
payload_len++;
}
#else
DEBUG("6lo: Send uncompressed\n");
sixlowpan = ng_pktbuf_add(NULL, NULL, sizeof(uint8_t), NG_NETTYPE_SIXLOWPAN);
if (sixlowpan == NULL) {
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt);
return;
}
sixlowpan->next = ipv6;
pkt->next = sixlowpan;
disp = sixlowpan->data;
disp[0] = NG_SIXLOWPAN_UNCOMPRESSED;
payload_len++;
#endif
DEBUG("6lo: max_frag_size = %" PRIu16 " for interface %"
PRIkernel_pid "\n", max_frag_size, hdr->if_pid);
/* IP should not send anything here if it is not a 6LoWPAN interface,
* so we don't need to check for NULL pointers */
if (payload_len <= max_frag_size) {
DEBUG("6lo: Send SND command for %p to %" PRIu16 "\n",
(void *)pkt, hdr->if_pid);
ng_netapi_send(hdr->if_pid, pkt);
return;
}
#ifdef MODULE_NG_SIXLOWPAN_FRAG
else {
DEBUG("6lo: Send fragmented (%u > %" PRIu16 ")\n",
(unsigned int)payload_len, max_frag_size);
ng_sixlowpan_frag_send(hdr->if_pid, pkt, payload_len, datagram_size);
}
#else
(void)datagram_size;
DEBUG("6lo: packet too big (%u> %" PRIu16 ")\n",
(unsigned int)payload_len, max_frag_size);
#endif
}
static void _send(ng_pktsnip_t *pkt)
{
ng_netif_hdr_t *hdr;
ng_pktsnip_t *pkt2;
ng_sixlowpan_netif_t *iface;
/* datagram_size: pure IPv6 packet without 6LoWPAN dispatches or compression */
size_t datagram_size;
if ((pkt == NULL) || (pkt->size < sizeof(ng_netif_hdr_t))) {
DEBUG("6lo: Sending packet has no netif header\n");
ng_pktbuf_release(pkt);
return;
}
if ((pkt->next == NULL) || (pkt->next->type != NG_NETTYPE_IPV6)) {
DEBUG("6lo: Sending packet has no IPv6 header\n");
ng_pktbuf_release(pkt);
return;
}
pkt2 = ng_pktbuf_start_write(pkt);
if (pkt2 == NULL) {
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt);
return;
}
hdr = pkt2->data;
iface = ng_sixlowpan_netif_get(hdr->if_pid);
datagram_size = ng_pkt_len(pkt2->next);
if (iface == NULL) {
DEBUG("6lo: Can not get 6LoWPAN specific interface information.\n");
ng_pktbuf_release(pkt);
return;
}
#ifdef MODULE_NG_SIXLOWPAN_IPHC
if (iface->iphc_enabled) {
if (!ng_sixlowpan_iphc_encode(pkt2)) {
DEBUG("6lo: error on IPHC encoding\n");
ng_pktbuf_release(pkt2);
return;
}
/* IPHC dispatch does not count on dispatch length since it _shortens_
* the datagram */
}
else {
if (!_add_uncompr_disp(pkt2)) {
/* adding uncompressed dispatch failed */
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt2);
return;
}
}
#else
/* suppress clang-analyzer report about iface being not read */
(void) iface;
if (!_add_uncompr_disp(pkt2)) {
/* adding uncompressed dispatch failed */
DEBUG("6lo: no space left in packet buffer\n");
ng_pktbuf_release(pkt2);
return;
}
#endif
DEBUG("6lo: iface->max_frag_size = %" PRIu16 " for interface %"
PRIkernel_pid "\n", iface->max_frag_size, hdr->if_pid);
/* IP should not send anything here if it is not a 6LoWPAN interface,
* so we don't need to check for NULL pointers */
if (datagram_size <= iface->max_frag_size) {
DEBUG("6lo: Send SND command for %p to %" PRIu16 "\n",
(void *)pkt2, hdr->if_pid);
ng_netapi_send(hdr->if_pid, pkt2);
return;
}
#ifdef MODULE_NG_SIXLOWPAN_FRAG
else {
DEBUG("6lo: Send fragmented (%u > %" PRIu16 ")\n",
(unsigned int)datagram_size, iface->max_frag_size);
ng_sixlowpan_frag_send(hdr->if_pid, pkt2, datagram_size);
}
#else
(void)datagram_size;
DEBUG("6lo: packet too big (%u> %" PRIu16 ")\n",
(unsigned int)datagram_size, iface->max_frag_size);
#endif
}
int _send(ng_netdev_t *dev, ng_pktsnip_t *pkt)
{
(void)dev;
size_t size;
size_t pos = 0;
uint8_t *dst_addr;
ng_netif_hdr_t *hdr;
ng_pktsnip_t *payload;
/* check packet */
if (pkt == NULL || pkt->next == NULL) {
DEBUG("nrfmin: Error sending packet: packet incomplete\n");
return -ENOMSG;
}
/* check if payload is withing length bounds */
size = ng_pkt_len(pkt->next);
if (size > CONF_PAYLOAD_LEN) {
ng_pktbuf_release(pkt);
DEBUG("nrfmin: Error sending packet: payload to large\n");
return -EOVERFLOW;
}
/* get netif header and check address length */
hdr = (ng_netif_hdr_t *)pkt->data;
if (hdr->dst_l2addr_len != 2) {
DEBUG("nrfmin: Error sending packet: dest address has invalid size\n");
ng_pktbuf_release(pkt);
return -ENOMSG;
}
dst_addr = ng_netif_hdr_get_dst_addr(hdr);
DEBUG("nrfmin: Sending packet to %02x:%02x - size %u\n",
dst_addr[0], dst_addr[1], size);
/* wait for any ongoing transmission to finish */
while (_state == STATE_TX);
/* write data into TX buffer */
payload = pkt->next;
_tx_buf.length = 6 + size;
_tx_buf.src_addr[0] = (uint8_t)(_addr >> 8);
_tx_buf.src_addr[1] = (uint8_t)(_addr);
_tx_buf.dst_addr[0] = dst_addr[0];
_tx_buf.dst_addr[1] = dst_addr[1];
_tx_buf.proto = _nettype_to_nrftype(payload->type);
while (payload) {
memcpy(&(_tx_buf.payload[pos]), payload->data, payload->size);
pos += payload->size;
payload = payload->next;
}
/* save old state and switch to idle if applicable */
_tx_prestate = _state;
if (_tx_prestate == STATE_RX) {
_switch_to_idle();
}
/* set packet pointer to TX buffer and write destination address */
NRF_RADIO->PACKETPTR = (uint32_t)(&_tx_buf);
NRF_RADIO->BASE0 &= ~(0xffff);
NRF_RADIO->BASE0 |= ((((uint16_t)dst_addr[0]) << 8) | dst_addr[1]);
/* start transmission */
_state = STATE_TX;
NRF_RADIO->TASKS_TXEN = 1;
/* release packet */
ng_pktbuf_release(pkt);
return (int)size;
}
