/**
* Insert segment into the list (segments covered with new one will be deleted)
*
* Called from tcp_receive()
*/
static void
tcp_oos_insert_segment(struct tcp_seg *cseg, struct tcp_seg *next)
{
struct tcp_seg *old_seg;
if (TCPH_FLAGS(cseg->tcphdr) & TCP_FIN) {
/* received segment overlaps all following segments */
tcp_segs_free(next);
next = NULL;
} else {
/* delete some following segments
oos queue may have segments with FIN flag */
while (next &&
TCP_SEQ_GEQ((seqno + cseg->len),
(next->tcphdr->seqno + next->len))) {
/* cseg with FIN already processed */
if (TCPH_FLAGS(next->tcphdr) & TCP_FIN) {
TCPH_FLAGS_SET(cseg->tcphdr, TCPH_FLAGS(cseg->tcphdr) | TCP_FIN);
}
old_seg = next;
next = next->next;
tcp_seg_free(old_seg);
}
if (next &&
TCP_SEQ_GT(seqno + cseg->len, next->tcphdr->seqno)) {
/* We need to trim the incoming segment. */
cseg->len = (u16_t)(next->tcphdr->seqno - seqno);
pbuf_realloc(cseg->p, cseg->len);
}
}
cseg->next = next;
}
static void
send_data(void)
{
u16_t *payload;
int ret;
if(tftp_state.last_data != NULL) {
pbuf_free(tftp_state.last_data);
}
tftp_state.last_data = pbuf_alloc(PBUF_TRANSPORT, TFTP_HEADER_LENGTH + TFTP_MAX_PAYLOAD_SIZE, PBUF_RAM);
if(tftp_state.last_data == NULL) {
return;
}
payload = (u16_t *) tftp_state.last_data->payload;
payload[0] = PP_HTONS(TFTP_DATA);
payload[1] = lwip_htons(tftp_state.blknum);
ret = tftp_state.ctx->read(tftp_state.handle, &payload[2], TFTP_MAX_PAYLOAD_SIZE);
if (ret < 0) {
send_error(&tftp_state.addr, tftp_state.port, TFTP_ERROR_ACCESS_VIOLATION, "Error occured while reading the file.");
close_handle();
return;
}
pbuf_realloc(tftp_state.last_data, (u16_t)(TFTP_HEADER_LENGTH + ret));
resend_data();
}
// on data received
err_t client_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
struct client *c = arg;
if (err!=ERR_OK) {
pbuf_free(p);
return client_kill(c);
}
// no buffer
if (!p) {
c->st = TERMINATED;
// and no queued data -> close
if (!c->p)
return client_kill(c);
return flushq(c);
}
switch (c->st) {
case ACCEPTED: {
c->st++;
}
case RECEIVED: {
// this is a hack - we assume each line fits into a single packet
// this could be done properly using pbuf header magic and keeping line state
u8_t *dst = p->payload;
u8_t *res = memchr(dst, '\n', p->len);
// invalid data or exit requested
if (!res || !memcmp(dst,"exit",4)) {
pbuf_free(p);
return client_kill(c);
}
// reverse the line
if (res[-1] == '\r') res--;
u32_t len = res-dst;
for (int i = 0; i < (len)/2;i++) {
u8_t t = dst[i];
dst[i] = dst[len-i-1];
dst[len-i-1] = t;
}
dst[len] = '\n';
pbuf_realloc(p, len+1);
// and enqueue it
if (c->p) {
pbuf_chain(c->p, p);
return ERR_OK;
}
c->p = p;
return flushq(c);
}
// unknown state
default: {
tcp_recved(pcb, p->tot_len);
c->p = NULL; // XXX leaky?
pbuf_free(p);
}
}
return ERR_OK;
}
static void
send_data(const ip_addr_t *addr, u16_t port)
{
u16_t *payload;
int ret;
if (tftp_state.last_data != NULL) {
pbuf_free(tftp_state.last_data);
}
tftp_state.last_data = init_packet(TFTP_DATA, tftp_state.blknum, TFTP_MAX_PAYLOAD_SIZE);
if (tftp_state.last_data == NULL) {
return;
}
payload = (u16_t *) tftp_state.last_data->payload;
ret = tftp_state.ctx->read(tftp_state.handle, &payload[2], TFTP_MAX_PAYLOAD_SIZE);
if (ret < 0) {
send_error(addr, port, TFTP_ERROR_ACCESS_VIOLATION, "Error occured while reading the file.");
close_handle();
return;
}
pbuf_realloc(tftp_state.last_data, (u16_t)(TFTP_HEADER_LENGTH + ret));
resend_data(addr, port);
}
static err_t dhcp_release(struct dhcp_state *state)
{
err_t result;
u16_t msecs;
DEBUGF(DHCP_DEBUG, ("dhcp_release()\n"));
// and idle DHCP client
dhcp_set_state(state, DHCP_OFF);
// create and initialize the DHCP message header
result = dhcp_create_request(state);
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_RELEASE);
dhcp_option_trailer(state);
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, &state->server_ip_addr, DHCP_SERVER_PORT);
udp_send(state->pcb, state->p_out);
dhcp_delete_request(state);
}
state->tries++;
msecs = state->tries < 10 ? state->tries * 1000 : 10 * 1000;
state->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
DEBUGF(DHCP_DEBUG, ("dhcp_release(): request timeout %u msecs\n", msecs));
// remove IP address from interface
netif_set_ipaddr(state->netif, IP_ADDR_ANY);
netif_set_gw(state->netif, IP_ADDR_ANY);
netif_set_netmask(state->netif, IP_ADDR_ANY);
return result;
}
// decline a
static err_t dhcp_decline(struct dhcp_state *state)
{
err_t result = ERR_OK;
u16_t msecs;
DEBUGF(DHCP_DEBUG, ("dhcp_decline()\n"));
dhcp_set_state(state, DHCP_BACKING_OFF);
// create and initialize the DHCP message header
result = dhcp_create_request(state);
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_DECLINE);
dhcp_option(state, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(state, 576);
dhcp_option_trailer(state);
// resize pbuf to reflect true size of options
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, &state->server_ip_addr, DHCP_SERVER_PORT);
udp_send(state->pcb, state->p_out);
dhcp_delete_request(state);
}
state->tries++;
msecs = 10*1000;
state->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
DEBUGF(DHCP_DEBUG, ("dhcp_decline(): request timeout %u msecs\n", msecs));
return result;
}
/* Transmit a packet on the General Port. */
size_t netSendGeneral(Octet *buf, UInteger16 length, NetPath *netPath)
{
int i, j;
struct pbuf *pcopy;
/* Reallocate the tx pbuf based on the current size. */
pbuf_realloc(netPath->generalTxBuf, length);
pcopy = netPath->generalTxBuf;
/* Copy the incoming data into the pbuf payload. */
j = 0;
for(i = 0; i < length; i++) {
((u8_t *)pcopy->payload)[j++] = buf[i];
if(j == pcopy->len) {
pcopy = pcopy->next;
j = 0;
}
}
/* send the buffer. */
udp_sendto(netPath->eventPcb, netPath->generalTxBuf,
(void *)&netPath->multicastAddr, PTP_GENERAL_PORT);
return(length);
}
/* Pass received pbufs into 6LowPAN netif */
static void
zepif_udp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p,
const ip_addr_t *addr, u16_t port)
{
err_t err;
struct netif *netif_lowpan6 = (struct netif *)arg;
struct zep_hdr *zep;
LWIP_ASSERT("arg != NULL", arg != NULL);
LWIP_ASSERT("pcb != NULL", pcb != NULL);
LWIP_UNUSED_ARG(pcb); /* for LWIP_NOASSERT */
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
if (p == NULL) {
return;
}
/* Parse and hide the ZEP header */
if (p->len < sizeof(struct zep_hdr)) {
/* need the zep_hdr in one piece */
goto err_return;
}
zep = (struct zep_hdr *)p->payload;
if (zep->prot_id[0] != 'E') {
goto err_return;
}
if (zep->prot_id[1] != 'X') {
goto err_return;
}
if (zep->prot_version != 2) {
/* we only support this version for now */
goto err_return;
}
if (zep->type != 1) {
goto err_return;
}
if (zep->crc_mode != 1) {
goto err_return;
}
if (zep->len != p->tot_len - sizeof(struct zep_hdr)) {
goto err_return;
}
/* everything seems to be OK, hide the ZEP header */
if (pbuf_remove_header(p, sizeof(struct zep_hdr))) {
goto err_return;
}
/* TODO Check CRC? */
/* remove CRC trailer */
pbuf_realloc(p, p->tot_len - 2);
/* Call into 6LoWPAN code. */
err = netif_lowpan6->input(p, netif_lowpan6);
if (err == ERR_OK) {
return;
}
err_return:
pbuf_free(p);
}
static VOID _DHCPOfferGenAndSend(PDHCP_CLIENT pClient, INT8U * pClientMacAddr, INT32U Xid)
{
INT32U Len;
INT8U * Body;
PDHCP_MSG pDhcpMsg;
struct pbuf * pDhcpBuf;
pDhcpBuf = pbuf_alloc(PBUF_TRANSPORT, sizeof(DHCP_MSG), PBUF_RAM);
if(pDhcpBuf == NULL)
{
return;
}
pDhcpMsg = &DhcpMsg;
memset(pDhcpMsg, 0, sizeof(*pDhcpMsg));
/* Initialize the DHCP message header. */
pDhcpMsg->Op = DHCP_OP_REPLY;
pDhcpMsg->HType = DHCP_HWTYPE_ETHERNET;
pDhcpMsg->HLen = 6;
pDhcpMsg->Xid = htonl(Xid);
pDhcpMsg->Yiaddr = pClient->IpAddr.addr;
pDhcpMsg->Siaddr = 0;
NST_MOVE_MEM(pDhcpMsg->Chaddr, pClientMacAddr, 6);
pDhcpMsg->Magic = htonl(DHCP_MAGIC);
Len = 240;
Body = &pDhcpMsg->Options[0];
/* Set the message type. */
DHCP_SET_OPTION_MSG_TYPE(Body, DHCP_MSG_OFFER, Len);
/* Set the lease time. */
DHCP_SET_OPTION_LEASE_TIME(Body, DHCP_DEFAULT_LEASE_TIME, Len);
/* Set the server's ip address */
DHCP_SET_OPTION_SERVER_ID(Body, DhcpServer.ServerIpAddr.addr, Len);
/* Set the subnet mask. */
DHCP_SET_OPTION_SUBNET_MASK(Body, DhcpServer.SubnetMask.addr, Len);
/* Set the default gatway's ip address. */
DHCP_SET_OPTION_GW(Body, DhcpServer.GateWay.addr, Len);
/* Set the dns server's ip address. */
DHCP_SET_OPTION_DNS(Body, DhcpServer.Dns1.addr, Len);
DHCP_SET_OPTION_END(Body, Len);
pbuf_take(pDhcpBuf, (const VOID *)pDhcpMsg, Len);
pbuf_realloc(pDhcpBuf, Len);
/* Send broadcast to the DHCP client. */
udp_sendto(DhcpServer.Socket, pDhcpBuf, IP_ADDR_BROADCAST, DHCP_CLIENT_UDP_PORT);
pbuf_free(pDhcpBuf);
}
enum rpc_stat
rpc_send(struct pbuf *pbuf, int len, struct udp_pcb *pcb,
void (*func)(void *, uintptr_t, struct pbuf *),
void *callback, uintptr_t token)
{
assert(pcb);
pbuf_realloc(pbuf, len);
/* Add to a queue */
add_to_queue(pbuf, pcb, func, callback, token);
return my_udp_send(pcb, pbuf);
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this ethernetif
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf *
low_level_input(struct netif *netif)
{
struct pbuf *p;
struct wlif_t *priv = (struct wlif_t*) netif->state;
char *stripped_pkt;
size_t stripped_pkt_len;
u16_t vlan;
u8_t rx_hdr_size;
int status;
u16_t len;
/* maximum packet length from wl_rx() */
len = WL_MAX_PKT_LEN;
/* We allocate a continous pbuf */
p = pbuf_alloc(PBUF_RAW, len, PBUF_RAM);
if (p == NULL) {
LWIP_DEBUGF(NETIF_DEBUG, ("low_level_input: fail to alloc "
"pbuf of len:%"S32_F"\n", len));
return NULL;
}
/* Read the entire msg */
priv->rx_pending = 0;
wl_rx(p->payload, &len);
if (len == 0) {
LWIP_DEBUGF(NETIF_DEBUG, ("low_level_input: len was 0"));
return NULL;
}
status = wl_process_rx(
p->payload, /* input buf */
len, /* input buf length */
&stripped_pkt,
&stripped_pkt_len,
&vlan);
if (status == WL_ABSORBED) {
LWIP_DEBUGF(NETIF_DEBUG, ("low_level_input: absorbed"));
pbuf_free(p);
return NULL;
}
/* Data packet, remove padding */
rx_hdr_size = stripped_pkt - (char*) p->payload;
pbuf_realloc(p, stripped_pkt_len + rx_hdr_size);
LINK_STATS_INC(link.recv);
return p;
}
void dhcp_inform(struct netif *netif)
{
struct dhcp_state *state = NULL;
err_t result = ERR_OK;
state = mem_malloc(sizeof(struct dhcp_state));
if (state == NULL)
{
DEBUGF(DHCP_DEBUG, ("dhcp_inform(): could not allocate dhcp_state\n"));
return;
}
memset(state, 0, sizeof(struct dhcp_state));
DEBUGF(DHCP_DEBUG, ("dhcp_inform(): allocated dhcp_state\n"));
state->pcb = udp_new();
if (state->pcb == NULL) {
DEBUGF(DHCP_DEBUG, ("dhcp_inform(): could not obtain pcb\n"));
mem_free((void *)state);
return;
}
DEBUGF(DHCP_DEBUG, ("dhcp_inform(): created new udp pcb\n"));
state->netif = netif;
// we are last in list
state->next = NULL;
// create and initialize the DHCP message header
result = dhcp_create_request(state);
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_INFORM);
dhcp_option(state, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(state, 576);
dhcp_option_trailer(state);
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, IP_ADDR_BROADCAST, DHCP_SERVER_PORT);
udp_send(state->pcb, state->p_out);
udp_connect(state->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
dhcp_delete_request(state);
}
if (state != NULL)
{
if (state->pcb != NULL) udp_remove(state->pcb);
state->pcb = NULL;
mem_free((void *)state);
}
}
/**
* Start the DHCP process, discover a server
*
*/
static err_t dhcp_discover(struct dhcp_state *state)
{
err_t result = ERR_OK;
u16_t msecs;
DEBUGF(DHCP_DEBUG, ("dhcp_discover(%p)\n", state));
ip_addr_set(&state->offered_ip_addr, IP_ADDR_ANY);
// create and initialize the DHCP message header
DEBUGF(DHCP_DEBUG, ("set ip addr, creating request()\n"));
result = dhcp_create_request(state);
DEBUGF(DHCP_DEBUG, ("created request\n"));
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_DISCOVER);
dhcp_option(state, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(state, 576);
dhcp_option(state, DHCP_OPTION_PARAMETER_REQUEST_LIST, 3);
dhcp_option_byte(state, DHCP_OPTION_SUBNET_MASK);
dhcp_option_byte(state, DHCP_OPTION_ROUTER);
dhcp_option_byte(state, DHCP_OPTION_BROADCAST);
dhcp_option_trailer(state);
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
DEBUGF(DHCP_DEBUG, ("about to do udp recv\n"));
udp_recv(state->pcb, dhcp_recv, state);
DEBUGF(DHCP_DEBUG, ("about to do udp bind\n"));
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
DEBUGF(DHCP_DEBUG, ("about to do udp connect\n"));
udp_connect(state->pcb, IP_ADDR_BROADCAST, DHCP_SERVER_PORT);
DEBUGF(DHCP_DEBUG, ("about to do udp send\n"));
udp_send(state->pcb, state->p_out);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
dhcp_delete_request(state);
}
state->tries++;
msecs = state->tries < 4 ? (state->tries + 1) * 1000 : 10 * 1000;
state->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
DEBUGF(DHCP_DEBUG, ("dhcp_discover(): request timeout %u msecs\n", msecs));
dhcp_set_state(state, DHCP_SELECTING);
return result;
}
/*-----------------------------------------------------------------------------------*/
static struct pbuf *
sioslipif_input(void)
{
u8_t c;
struct pbuf *p, *q;
int recved;
int i;
p = pbuf_alloc(PBUF_LINK, PBUF_MAX_SIZE, PBUF_POOL);
q = p;
recved = i = 0;
while (1) {
c = sio_recv();
switch (c) {
case SLIP_END:
if (recved > 0) {
/* Received whole packet. */
pbuf_realloc(p, recved);
return p;
}
break;
case SLIP_ESC:
c = sio_recv();
switch (c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
/* FALLTHROUGH */
default:
if (recved < p->tot_len && q != NULL) {
((u8_t *)q->payload)[i] = c;
recved++;
i++;
if (i >= q->len) {
i = 0;
q = q->next;
}
}
break;
}
}
}
/**
* Select a DHCP server offer out of all offers.
*
* Simply select the first offer received, ignore others
*/
static err_t dhcp_select(struct dhcp_state *state)
{
err_t result;
u32_t msecs;
DEBUGF(DHCP_DEBUG, ("dhcp_select()\n"));
// create and initialize the DHCP message header
result = dhcp_create_request(state);
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_REQUEST);
dhcp_option(state, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(state, 576);
/* MUST request the offered IP address */
dhcp_option(state, DHCP_OPTION_REQUESTED_IP, 4);
dhcp_option_long(state, ntohl(state->offered_ip_addr.addr));
dhcp_option(state, DHCP_OPTION_SERVER_ID, 4);
dhcp_option_long(state, ntohl(state->server_ip_addr.addr));
dhcp_option(state, DHCP_OPTION_PARAMETER_REQUEST_LIST, 3);
dhcp_option_byte(state, DHCP_OPTION_SUBNET_MASK);
dhcp_option_byte(state, DHCP_OPTION_ROUTER);
dhcp_option_byte(state, DHCP_OPTION_BROADCAST);
dhcp_option_trailer(state);
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, IP_ADDR_BROADCAST, DHCP_SERVER_PORT);
udp_send(state->pcb, state->p_out);
// reconnect to any (or to server here?!)
udp_connect(state->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
dhcp_delete_request(state);
}
state->tries++;
msecs = state->tries < 4 ? state->tries * 1000 : 4 * 1000;
state->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
DEBUGF(DHCP_DEBUG, ("dhcp_select(): request timeout %u msecs\n", msecs));
dhcp_set_state(state, DHCP_REQUESTING);
return result;
}
void
l2cap_input(struct pbuf *p, struct bd_addr *bdaddr)
{
struct l2cap_seg *inseg;
struct hci_acl_hdr *aclhdr;
struct pbuf *data;
err_t ret;
pbuf_header(p, HCI_ACL_HDR_LEN);
aclhdr = p->payload;
pbuf_header(p, -HCI_ACL_HDR_LEN);
pbuf_realloc(p, aclhdr->len);
for(inseg = l2cap_insegs; inseg != NULL; inseg = inseg->next) {
if(bd_addr_cmp(bdaddr, &(inseg->bdaddr))) {
break;
}
}
/* Reassembly procedures */
/* Check if continuing fragment or start of L2CAP packet */
if(((aclhdr->conhdl_pb_bc >> 12) & 0x03)== L2CAP_ACL_CONT) { /* Continuing fragment */
if(inseg == NULL) {
/* Discard packet */
LWIP_DEBUGF(L2CAP_DEBUG, ("l2cap_input: Continuing fragment. Discard packet\n"));
pbuf_free(p);
return;
} else if(inseg->p->tot_len + p->tot_len > inseg->len) { /* Check if length of
segment exceeds
l2cap header length */
/* Discard packet */
LWIP_DEBUGF(L2CAP_DEBUG, ("l2cap_input: Continuing fragment. Length exceeds L2CAP hdr length. Discard packet\n"));
pbuf_free(inseg->p);
L2CAP_SEG_RMV(&(l2cap_insegs), inseg);
lwbt_memp_free(MEMP_L2CAP_SEG, inseg);
pbuf_free(p);
return;
}
/* Add pbuf to segement */
pbuf_chain(inseg->p, p);
pbuf_free(p);
} else if(((aclhdr->conhdl_pb_bc >> 12) & 0x03) == L2CAP_ACL_START) { /* Start of L2CAP packet */
err_t dhcp_renew(struct dhcp_state *state)
{
err_t result;
u16_t msecs;
DEBUGF(DHCP_DEBUG, ("dhcp_renew()\n"));
dhcp_set_state(state, DHCP_RENEWING);
// create and initialize the DHCP message header
result = dhcp_create_request(state);
if (result == ERR_OK)
{
dhcp_option(state, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
dhcp_option_byte(state, DHCP_REQUEST);
dhcp_option(state, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(state, 576);
#if 0
dhcp_option(state, DHCP_OPTION_REQUESTED_IP, 4);
dhcp_option_long(state, ntohl(state->offered_ip_addr.addr));
#endif
#if 0
dhcp_option(state, DHCP_OPTION_SERVER_ID, 4);
dhcp_option_long(state, ntohl(state->server_ip_addr.addr));
#endif
dhcp_option_trailer(state);
pbuf_realloc(state->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + state->options_out_len);
udp_bind(state->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
udp_connect(state->pcb, &state->server_ip_addr, DHCP_SERVER_PORT);
udp_send(state->pcb, state->p_out);
dhcp_delete_request(state);
}
state->tries++;
// back-off on retries, but to a maximum of 20 seconds
msecs = state->tries < 10 ? state->tries * 2000 : 20 * 1000;
state->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
DEBUGF(DHCP_DEBUG, ("dhcp_renew(): request timeout %u msecs\n", msecs));
return result;
}
int EthernetUDP::endPacket()
{
ip_addr_t dest;
dest.addr = _sendToIP;
/* Shrink the pbuf to the actual size that was written to it */
pbuf_realloc(_sendTop, _write);
/* Send the buffer to the remote host */
err_t err = udp_sendto(_pcb, _sendTop, &dest, _sendToPort);
/* udp_sendto is blocking and the pbuf is
* no longer needed so free it */
pbuf_free(_sendTop);
if(err != ERR_OK)
return false;
return true;
}
static void send_data(struct udp_pcb *upcb, ip_addr_t *addr, u16_t port,
struct tftp_state *ts)
{
ts->last_data = pbuf_alloc(PBUF_RAM, 4 + 512, PBUF_RAM);
u16_t *payload = (u16_t *) ts->last_data->payload;
payload[0] = htons(DATA);
payload[1] = htons(ts->blknum);
int ret = ts->ctx->read(ts->handle, &payload[2], 512);
if (ret < 0) {
send_error(upcb, addr, port, ERROR_ACCESS_VIOLATION,
"Error occured while reading the file.");
pbuf_free(ts->last_data);
ts->last_data = NULL;
close_handle(ts);
return;
}
pbuf_realloc(ts->last_data, 4 + ret);
resend_data(upcb, addr, port, ts);
}
static VOID _DHCPNakGenAndSend(INT8U * pClientMacAddr, INT32U Xid)
{
INT32U Len;
INT8U * Body;
PDHCP_MSG pDhcpMsg;
struct pbuf * pDhcpBuf;
pDhcpBuf = pbuf_alloc(PBUF_TRANSPORT, sizeof(DHCP_MSG), PBUF_RAM);
if(pDhcpBuf == NULL)
{
return;
}
pDhcpMsg = &DhcpMsg;
memset(pDhcpMsg, 0, sizeof(*pDhcpMsg));
/* Initialize the DHCP message header. */
pDhcpMsg->Op = DHCP_OP_REPLY;
pDhcpMsg->HType = DHCP_HWTYPE_ETHERNET;
pDhcpMsg->HLen = 6;
pDhcpMsg->Xid = htonl(Xid);
pDhcpMsg->Siaddr = DhcpServer.ServerIpAddr.addr;
NST_MOVE_MEM(pDhcpMsg->Chaddr, pClientMacAddr, 6);
pDhcpMsg->Magic = htonl(DHCP_MAGIC);
Len = 240;
Body = &pDhcpMsg->Options[0];
/* Set the message type. */
DHCP_SET_OPTION_MSG_TYPE(Body, DHCP_MSG_NAK, Len);
DHCP_SET_OPTION_END(Body, Len);
pbuf_take(pDhcpBuf, (const VOID *)pDhcpMsg, Len);
pbuf_realloc(pDhcpBuf, Len);
/* Send broadcast to the DHCP client. */
udp_sendto(DhcpServer.Socket, pDhcpBuf, IP_ADDR_BROADCAST, DHCP_CLIENT_UDP_PORT);
pbuf_free(pDhcpBuf);
}
/**
* Fragment an IP datagram if too large for the netif.
*
* Chop the datagram in MTU sized chunks and send them in order
* by using a fixed size static memory buffer (PBUF_REF) or
* point PBUF_REFs into p (depending on IP_FRAG_USES_STATIC_BUF).
*
* @param p ip packet to send
* @param netif the netif on which to send
* @param dest destination ip address to which to send
*
* @return ERR_OK if sent successfully, err_t otherwise
*/
err_t
ip_frag(struct pbuf *p, struct netif *netif, ip_addr_t *dest)
{
struct pbuf *rambuf;
#if IP_FRAG_USES_STATIC_BUF
struct pbuf *header;
#else
#if !LWIP_NETIF_TX_SINGLE_PBUF
struct pbuf *newpbuf;
#endif
struct ip_hdr *original_iphdr;
#endif
struct ip_hdr *iphdr;
u16_t nfb;
u16_t left, cop;
u16_t mtu = netif->mtu;
u16_t ofo, omf;
u16_t last;
u16_t poff = IP_HLEN;
u16_t tmp;
#if !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF
u16_t newpbuflen = 0;
u16_t left_to_copy;
#endif
/* Get a RAM based MTU sized pbuf */
#if IP_FRAG_USES_STATIC_BUF
/* When using a static buffer, we use a PBUF_REF, which we will
* use to reference the packet (without link header).
* Layer and length is irrelevant.
*/
rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_REF);
if (rambuf == NULL) {
LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc(PBUF_LINK, 0, PBUF_REF) failed\n"));
return ERR_MEM;
}
rambuf->tot_len = rambuf->len = mtu;
rambuf->payload = LWIP_MEM_ALIGN((void *)buf);
/* Copy the IP header in it */
iphdr = (struct ip_hdr *)rambuf->payload;
SMEMCPY(iphdr, p->payload, IP_HLEN);
#else /* IP_FRAG_USES_STATIC_BUF */
original_iphdr = (struct ip_hdr *)p->payload;
iphdr = original_iphdr;
#endif /* IP_FRAG_USES_STATIC_BUF */
/* Save original offset */
tmp = ntohs(IPH_OFFSET(iphdr));
ofo = tmp & IP_OFFMASK;
omf = tmp & IP_MF;
left = p->tot_len - IP_HLEN;
nfb = (mtu - IP_HLEN) / 8;
while (left) {
last = (left <= mtu - IP_HLEN);
/* Set new offset and MF flag */
tmp = omf | (IP_OFFMASK & (ofo));
if (!last) {
tmp = tmp | IP_MF;
}
/* Fill this fragment */
cop = last ? left : nfb * 8;
#if IP_FRAG_USES_STATIC_BUF
poff += pbuf_copy_partial(p, (u8_t*)iphdr + IP_HLEN, cop, poff);
#else /* IP_FRAG_USES_STATIC_BUF */
#if LWIP_NETIF_TX_SINGLE_PBUF
rambuf = pbuf_alloc(PBUF_IP, cop, PBUF_RAM);
if (rambuf == NULL) {
return ERR_MEM;
}
LWIP_ASSERT("this needs a pbuf in one piece!",
(rambuf->len == rambuf->tot_len) && (rambuf->next == NULL));
poff += pbuf_copy_partial(p, rambuf->payload, cop, poff);
/* make room for the IP header */
if(pbuf_header(rambuf, IP_HLEN)) {
pbuf_free(rambuf);
return ERR_MEM;
}
/* fill in the IP header */
SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
iphdr = rambuf->payload;
#else /* LWIP_NETIF_TX_SINGLE_PBUF */
/* When not using a static buffer, create a chain of pbufs.
* The first will be a PBUF_RAM holding the link and IP header.
* The rest will be PBUF_REFs mirroring the pbuf chain to be fragged,
* but limited to the size of an mtu.
*/
rambuf = pbuf_alloc(PBUF_LINK, IP_HLEN, PBUF_RAM);
if (rambuf == NULL) {
return ERR_MEM;
}
LWIP_ASSERT("this needs a pbuf in one piece!",
(p->len >= (IP_HLEN)));
SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
iphdr = (struct ip_hdr *)rambuf->payload;
/* Can just adjust p directly for needed offset. */
p->payload = (u8_t *)p->payload + poff;
p->len -= poff;
left_to_copy = cop;
while (left_to_copy) {
struct pbuf_custom_ref *pcr;
newpbuflen = (left_to_copy < p->len) ? left_to_copy : p->len;
/* Is this pbuf already empty? */
if (!newpbuflen) {
p = p->next;
continue;
}
pcr = ip_frag_alloc_pbuf_custom_ref();
if (pcr == NULL) {
pbuf_free(rambuf);
return ERR_MEM;
}
/* Mirror this pbuf, although we might not need all of it. */
newpbuf = pbuf_alloced_custom(PBUF_RAW, newpbuflen, PBUF_REF, &pcr->pc, p->payload, newpbuflen);
if (newpbuf == NULL) {
ip_frag_free_pbuf_custom_ref(pcr);
pbuf_free(rambuf);
return ERR_MEM;
}
pbuf_ref(p);
pcr->original = p;
pcr->pc.custom_free_function = ipfrag_free_pbuf_custom;
/* Add it to end of rambuf's chain, but using pbuf_cat, not pbuf_chain
* so that it is removed when pbuf_dechain is later called on rambuf.
*/
pbuf_cat(rambuf, newpbuf);
left_to_copy -= newpbuflen;
if (left_to_copy) {
p = p->next;
}
}
poff = newpbuflen;
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
#endif /* IP_FRAG_USES_STATIC_BUF */
/* Correct header */
IPH_OFFSET_SET(iphdr, htons(tmp));
IPH_LEN_SET(iphdr, htons(cop + IP_HLEN));
IPH_CHKSUM_SET(iphdr, 0);
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
#if IP_FRAG_USES_STATIC_BUF
if (last) {
pbuf_realloc(rambuf, left + IP_HLEN);
}
/* This part is ugly: we alloc a RAM based pbuf for
* the link level header for each chunk and then
* free it.A PBUF_ROM style pbuf for which pbuf_header
* worked would make things simpler.
*/
header = pbuf_alloc(PBUF_LINK, 0, PBUF_RAM);
if (header != NULL) {
pbuf_chain(header, rambuf);
netif->output(netif, header, dest);
IPFRAG_STATS_INC(ip_frag.xmit);
snmp_inc_ipfragcreates();
pbuf_free(header);
} else {
LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc() for header failed\n"));
pbuf_free(rambuf);
return ERR_MEM;
}
#else /* IP_FRAG_USES_STATIC_BUF */
/* No need for separate header pbuf - we allowed room for it in rambuf
* when allocated.
*/
netif->output(netif, rambuf, dest);
IPFRAG_STATS_INC(ip_frag.xmit);
/* Unfortunately we can't reuse rambuf - the hardware may still be
* using the buffer. Instead we free it (and the ensuing chain) and
* recreate it next time round the loop. If we're lucky the hardware
* will have already sent the packet, the free will really free, and
* there will be zero memory penalty.
*/
pbuf_free(rambuf);
#endif /* IP_FRAG_USES_STATIC_BUF */
left -= cop;
ofo += nfb;
}
#if IP_FRAG_USES_STATIC_BUF
pbuf_free(rambuf);
#endif /* IP_FRAG_USES_STATIC_BUF */
snmp_inc_ipfragoks();
return ERR_OK;
}
/**
* Handle the incoming SLIP stream character by character
*
* @param netif the lwip network interface structure for this slipif
* @param c received character (multiple calls to this function will
* return a complete packet, NULL is returned before - used for polling)
* @return The IP packet when SLIP_END is received
*/
static struct pbuf*
slipif_rxbyte(struct netif *netif, u8_t c)
{
struct slipif_priv *priv;
struct pbuf *t;
LWIP_ASSERT("netif != NULL", (netif != NULL));
LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
priv = netif->state;
switch (priv->state) {
case SLIP_RECV_NORMAL:
switch (c) {
case SLIP_END:
if (priv->recved > 0) {
/* Received whole packet. */
/* Trim the pbuf to the size of the received packet. */
pbuf_realloc(priv->q, priv->recved);
LINK_STATS_INC(link.recv);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet (%"U16_F" bytes)\n", priv->recved));
t = priv->q;
priv->p = priv->q = NULL;
priv->i = priv->recved = 0;
return t;
}
return NULL;
case SLIP_ESC:
priv->state = SLIP_RECV_ESCAPE;
return NULL;
} /* end switch (c) */
break;
case SLIP_RECV_ESCAPE:
/* un-escape END or ESC bytes, leave other bytes
(although that would be a protocol error) */
switch (c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
priv->state = SLIP_RECV_NORMAL;
break;
} /* end switch (priv->state) */
/* byte received, packet not yet completely received */
if (priv->p == NULL) {
/* allocate a new pbuf */
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
if (priv->p == NULL) {
LINK_STATS_INC(link.drop);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
/* don't process any further since we got no pbuf to receive to */
return NULL;
}
if (priv->q != NULL) {
/* 'chain' the pbuf to the existing chain */
pbuf_cat(priv->q, priv->p);
} else {
/* p is the first pbuf in the chain */
priv->q = priv->p;
}
}
/* this automatically drops bytes if > SLIP_MAX_SIZE */
if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
((u8_t *)priv->p->payload)[priv->i] = c;
priv->recved++;
priv->i++;
if (priv->i >= priv->p->len) {
/* on to the next pbuf */
priv->i = 0;
if (priv->p->next != NULL && priv->p->next->len > 0) {
/* p is a chain, on to the next in the chain */
priv->p = priv->p->next;
} else {
/* p is a single pbuf, set it to NULL so next time a new
* pbuf is allocated */
priv->p = NULL;
}
}
}
return NULL;
}
/**
* This function is called by the network interface device driver when
* an IPv6 packet is received. The function does the basic checks of the
* IP header such as packet size being at least larger than the header
* size etc. If the packet was not destined for us, the packet is
* forwarded (using ip6_forward).
*
* Finally, the packet is sent to the upper layer protocol input function.
*
* @param p the received IPv6 packet (p->payload points to IPv6 header)
* @param inp the netif on which this packet was received
* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
* processed, but currently always returns ERR_OK)
*/
err_t
ip6_input(struct pbuf *p, struct netif *inp)
{
struct ip6_hdr *ip6hdr;
struct netif *netif;
u8_t nexth;
u16_t hlen; /* the current header length */
u8_t i;
#if 0 /*IP_ACCEPT_LINK_LAYER_ADDRESSING*/
@todo
int check_ip_src=1;
#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
IP6_STATS_INC(ip6.recv);
/* identify the IP header */
ip6hdr = (struct ip6_hdr *)p->payload;
if (IP6H_V(ip6hdr) != 6) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IPv6 packet dropped due to bad version number %"U32_F"\n",
IP6H_V(ip6hdr)));
pbuf_free(p);
IP6_STATS_INC(ip6.err);
IP6_STATS_INC(ip6.drop);
return ERR_OK;
}
#ifdef LWIP_HOOK_IP6_INPUT
if (LWIP_HOOK_IP6_INPUT(p, inp)) {
/* the packet has been eaten */
return ERR_OK;
}
#endif
/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
if ((IP6_HLEN > p->len) || ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len)) {
if (IP6_HLEN > p->len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
IP6_HLEN, p->len));
}
if ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 (plen %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
IP6H_PLEN(ip6hdr) + IP6_HLEN, p->tot_len));
}
/* free (drop) packet pbufs */
pbuf_free(p);
IP6_STATS_INC(ip6.lenerr);
IP6_STATS_INC(ip6.drop);
return ERR_OK;
}
/* Trim pbuf. This should have been done at the netif layer,
* but we'll do it anyway just to be sure that its done. */
pbuf_realloc(p, IP6_HLEN + IP6H_PLEN(ip6hdr));
/* copy IP addresses to aligned ip6_addr_t */
ip_addr_copy_from_ip6(ip_data.current_iphdr_dest, ip6hdr->dest);
ip_addr_copy_from_ip6(ip_data.current_iphdr_src, ip6hdr->src);
/* current header pointer. */
ip_data.current_ip6_header = ip6hdr;
/* In netif, used in case we need to send ICMPv6 packets back. */
ip_data.current_netif = inp;
ip_data.current_input_netif = inp;
/* match packet against an interface, i.e. is this packet for us? */
if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
/* Always joined to multicast if-local and link-local all-nodes group. */
if (ip6_addr_isallnodes_iflocal(ip6_current_dest_addr()) ||
ip6_addr_isallnodes_linklocal(ip6_current_dest_addr())) {
netif = inp;
}
#if LWIP_IPV6_MLD
else if (mld6_lookfor_group(inp, ip6_current_dest_addr())) {
netif = inp;
}
#else /* LWIP_IPV6_MLD */
else if (ip6_addr_issolicitednode(ip6_current_dest_addr())) {
/* Filter solicited node packets when MLD is not enabled
* (for Neighbor discovery). */
netif = NULL;
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(inp, i)) &&
ip6_addr_cmp_solicitednode(ip6_current_dest_addr(), netif_ip6_addr(inp, i))) {
netif = inp;
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: solicited node packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
break;
}
}
}
#endif /* LWIP_IPV6_MLD */
else {
netif = NULL;
}
} else {
/* start trying with inp. if that's not acceptable, start walking the
list of configured netifs.
'first' is used as a boolean to mark whether we started walking the list */
int first = 1;
netif = inp;
do {
/* interface is up? */
if (netif_is_up(netif)) {
/* unicast to this interface address? address configured? */
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_cmp(ip6_current_dest_addr(), netif_ip6_addr(netif, i))) {
/* exit outer loop */
goto netif_found;
}
}
}
if (ip6_addr_islinklocal(ip6_current_dest_addr())) {
/* Do not match link-local addresses to other netifs. */
netif = NULL;
break;
}
if (first) {
first = 0;
netif = netif_list;
} else {
netif = netif->next;
}
if (netif == inp) {
netif = netif->next;
}
} while (netif != NULL);
netif_found:
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet accepted on interface %c%c\n",
netif ? netif->name[0] : 'X', netif? netif->name[1] : 'X'));
}
/* "::" packet source address? (used in duplicate address detection) */
if (ip6_addr_isany(ip6_current_src_addr()) &&
(!ip6_addr_issolicitednode(ip6_current_dest_addr()))) {
/* packet source is not valid */
/* free (drop) packet pbufs */
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with src ANY_ADDRESS dropped\n"));
pbuf_free(p);
IP6_STATS_INC(ip6.drop);
goto ip6_input_cleanup;
}
/* packet not for us? */
if (netif == NULL) {
/* packet not for us, route or discard */
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_TRACE, ("ip6_input: packet not for us.\n"));
#if LWIP_IPV6_FORWARD
/* non-multicast packet? */
if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
/* try to forward IP packet on (other) interfaces */
ip6_forward(p, ip6hdr, inp);
}
#endif /* LWIP_IPV6_FORWARD */
pbuf_free(p);
goto ip6_input_cleanup;
}
/* current netif pointer. */
ip_data.current_netif = netif;
/* Save next header type. */
nexth = IP6H_NEXTH(ip6hdr);
/* Init header length. */
hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
/* Move to payload. */
pbuf_header(p, -IP6_HLEN);
/* Process known option extension headers, if present. */
while (nexth != IP6_NEXTH_NONE)
{
switch (nexth) {
case IP6_NEXTH_HOPBYHOP:
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header\n"));
/* Get next header type. */
nexth = *((u8_t *)p->payload);
/* Get the header length. */
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
ip_data.current_ip_header_tot_len += hlen;
/* Skip over this header. */
if (hlen > p->len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
hlen, p->len));
/* free (drop) packet pbufs */
pbuf_free(p);
IP6_STATS_INC(ip6.lenerr);
IP6_STATS_INC(ip6.drop);
goto ip6_input_cleanup;
}
pbuf_header(p, -(s16_t)hlen);
break;
case IP6_NEXTH_DESTOPTS:
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Destination options header\n"));
/* Get next header type. */
nexth = *((u8_t *)p->payload);
/* Get the header length. */
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
ip_data.current_ip_header_tot_len += hlen;
/* Skip over this header. */
if (hlen > p->len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
hlen, p->len));
/* free (drop) packet pbufs */
pbuf_free(p);
IP6_STATS_INC(ip6.lenerr);
IP6_STATS_INC(ip6.drop);
goto ip6_input_cleanup;
}
pbuf_header(p, -(s16_t)hlen);
break;
case IP6_NEXTH_ROUTING:
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Routing header\n"));
/* Get next header type. */
nexth = *((u8_t *)p->payload);
/* Get the header length. */
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
ip_data.current_ip_header_tot_len += hlen;
/* Skip over this header. */
if (hlen > p->len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
hlen, p->len));
/* free (drop) packet pbufs */
pbuf_free(p);
IP6_STATS_INC(ip6.lenerr);
IP6_STATS_INC(ip6.drop);
goto ip6_input_cleanup;
}
pbuf_header(p, -(s16_t)hlen);
break;
case IP6_NEXTH_FRAGMENT:
{
struct ip6_frag_hdr * frag_hdr;
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header\n"));
frag_hdr = (struct ip6_frag_hdr *)p->payload;
/* Get next header type. */
nexth = frag_hdr->_nexth;
/* Fragment Header length. */
hlen = 8;
ip_data.current_ip_header_tot_len += hlen;
/* Make sure this header fits in current pbuf. */
if (hlen > p->len) {
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
hlen, p->len));
/* free (drop) packet pbufs */
pbuf_free(p);
IP6_FRAG_STATS_INC(ip6_frag.lenerr);
IP6_FRAG_STATS_INC(ip6_frag.drop);
goto ip6_input_cleanup;
}
/* Offset == 0 and more_fragments == 0? */
if ((frag_hdr->_fragment_offset &
PP_HTONS(IP6_FRAG_OFFSET_MASK | IP6_FRAG_MORE_FLAG)) == 0) {
/* This is a 1-fragment packet, usually a packet that we have
* already reassembled. Skip this header anc continue. */
pbuf_header(p, -(s16_t)hlen);
} else {
#if LWIP_IPV6_REASS
/* reassemble the packet */
p = ip6_reass(p);
/* packet not fully reassembled yet? */
if (p == NULL) {
goto ip6_input_cleanup;
}
/* Returned p point to IPv6 header.
* Update all our variables and pointers and continue. */
ip6hdr = (struct ip6_hdr *)p->payload;
nexth = IP6H_NEXTH(ip6hdr);
hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
pbuf_header(p, -IP6_HLEN);
#else /* LWIP_IPV6_REASS */
/* free (drop) packet pbufs */
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header dropped (with LWIP_IPV6_REASS==0)\n"));
pbuf_free(p);
IP6_STATS_INC(ip6.opterr);
IP6_STATS_INC(ip6.drop);
goto ip6_input_cleanup;
#endif /* LWIP_IPV6_REASS */
}
break;
}
default:
goto options_done;
break;
}
}
options_done:
/* p points to IPv6 header again. */
pbuf_header_force(p, ip_data.current_ip_header_tot_len);
/* send to upper layers */
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: \n"));
ip6_debug_print(p);
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
#if LWIP_RAW
/* raw input did not eat the packet? */
if (raw_input(p, inp) == 0)
#endif /* LWIP_RAW */
{
switch (nexth) {
case IP6_NEXTH_NONE:
pbuf_free(p);
break;
#if LWIP_UDP
case IP6_NEXTH_UDP:
#if LWIP_UDPLITE
case IP6_NEXTH_UDPLITE:
#endif /* LWIP_UDPLITE */
/* Point to payload. */
pbuf_header(p, -(s16_t)ip_data.current_ip_header_tot_len);
udp_input(p, inp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case IP6_NEXTH_TCP:
/* Point to payload. */
pbuf_header(p, -(s16_t)ip_data.current_ip_header_tot_len);
tcp_input(p, inp);
break;
#endif /* LWIP_TCP */
#if LWIP_ICMP6
case IP6_NEXTH_ICMP6:
/* Point to payload. */
pbuf_header(p, -(s16_t)ip_data.current_ip_header_tot_len);
icmp6_input(p, inp);
break;
#endif /* LWIP_ICMP */
default:
#if LWIP_ICMP6
/* send ICMP parameter problem unless it was a multicast or ICMPv6 */
if ((!ip6_addr_ismulticast(ip6_current_dest_addr())) &&
(IP6H_NEXTH(ip6hdr) != IP6_NEXTH_ICMP6)) {
icmp6_param_problem(p, ICMP6_PP_HEADER, ip_data.current_ip_header_tot_len - hlen);
}
#endif /* LWIP_ICMP */
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_input: Unsupported transport protocol %"U16_F"\n", IP6H_NEXTH(ip6hdr)));
pbuf_free(p);
IP6_STATS_INC(ip6.proterr);
IP6_STATS_INC(ip6.drop);
break;
}
}
ip6_input_cleanup:
ip_data.current_netif = NULL;
ip_data.current_input_netif = NULL;
ip_data.current_ip6_header = NULL;
ip_data.current_ip_header_tot_len = 0;
ip6_addr_set_zero(ip6_current_src_addr());
ip6_addr_set_zero(ip6_current_dest_addr());
return ERR_OK;
}
/**
* This function is called by the network interface device driver when
* an IP packet is received. The function does the basic checks of the
* IP header such as packet size being at least larger than the header
* size etc. If the packet was not destined for us, the packet is
* forwarded (using ip_forward). The IP checksum is always checked.
*
* Finally, the packet is sent to the upper layer protocol input function.
*
* @param p the received IP packet (p->payload points to IP header)
* @param inp the netif on which this packet was received
* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
* processed, but currently always returns ERR_OK)
*/
err_t
ip_input(struct pbuf *p, struct netif *inp)
{
struct ip_hdr *iphdr;
struct netif *netif;
u16_t iphdr_hlen;
u16_t iphdr_len;
#if LWIP_DHCP
int check_ip_src=1;
#endif /* LWIP_DHCP */
IP_STATS_INC(ip.recv);
snmp_inc_ipinreceives();
/* identify the IP header */
iphdr = p->payload;
if (IPH_V(iphdr) != 4) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
ip_debug_print(p);
pbuf_free(p);
IP_STATS_INC(ip.err);
IP_STATS_INC(ip.drop);
snmp_inc_ipinhdrerrors();
return ERR_OK;
}
/* obtain IP header length in number of 32-bit words */
iphdr_hlen = IPH_HL(iphdr);
/* calculate IP header length in bytes */
iphdr_hlen *= 4;
/* obtain ip length in bytes */
iphdr_len = ntohs(IPH_LEN(iphdr));
/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
if (iphdr_hlen > p->len) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
iphdr_hlen, p->len));
}
if (iphdr_len > p->tot_len) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
iphdr_len, p->tot_len));
}
/* free (drop) packet pbufs */
pbuf_free(p);
IP_STATS_INC(ip.lenerr);
IP_STATS_INC(ip.drop);
snmp_inc_ipindiscards();
return ERR_OK;
}
/* verify checksum */
#if CHECKSUM_CHECK_IP
if (inet_chksum(iphdr, iphdr_hlen) != 0) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
ip_debug_print(p);
pbuf_free(p);
IP_STATS_INC(ip.chkerr);
IP_STATS_INC(ip.drop);
snmp_inc_ipinhdrerrors();
return ERR_OK;
}
#endif
/* Trim pbuf. This should have been done at the netif layer,
* but we'll do it anyway just to be sure that its done. */
pbuf_realloc(p, iphdr_len);
/* match packet against an interface, i.e. is this packet for us? */
#if LWIP_IGMP
if (ip_addr_ismulticast(&(iphdr->dest))) {
if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
netif = inp;
} else {
netif = NULL;
}
} else
#endif /* LWIP_IGMP */
{
/* start trying with inp. if that's not acceptable, start walking the
list of configured netifs.
'first' is used as a boolean to mark whether we started walking the list */
int first = 1;
netif = inp;
do {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
iphdr->dest.addr, netif->ip_addr.addr,
iphdr->dest.addr & netif->netmask.addr,
netif->ip_addr.addr & netif->netmask.addr,
iphdr->dest.addr & ~(netif->netmask.addr)));
/* interface is up and configured? */
if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
/* unicast to this interface address? */
if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
/* or broadcast on this interface network address? */
ip_addr_isbroadcast(&(iphdr->dest), netif)) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
}
if (first) {
first = 0;
netif = netif_list;
} else {
netif = netif->next;
}
if (netif == inp) {
netif = netif->next;
}
} while(netif != NULL);
}
#if LWIP_DHCP
/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
* According to RFC 1542 section 3.1.1, referred by RFC 2131).
*/
if (netif == NULL) {
/* remote port is DHCP server? */
if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest)));
if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
netif = inp;
check_ip_src = 0;
}
}
}
#endif /* LWIP_DHCP */
/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
#if LWIP_DHCP
/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
if (check_ip_src && (iphdr->src.addr != 0))
#endif /* LWIP_DHCP */
{ if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
(ip_addr_ismulticast(&(iphdr->src)))) {
/* packet source is not valid */
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
/* free (drop) packet pbufs */
pbuf_free(p);
IP_STATS_INC(ip.drop);
snmp_inc_ipinaddrerrors();
snmp_inc_ipindiscards();
return ERR_OK;
}
}
/* packet not for us? */
if (netif == NULL) {
/* packet not for us, route or discard */
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
#if IP_FORWARD
/* non-broadcast packet? */
if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
/* try to forward IP packet on (other) interfaces */
ip_forward(p, iphdr, inp);
} else
#endif /* IP_FORWARD */
{
snmp_inc_ipinaddrerrors();
snmp_inc_ipindiscards();
}
pbuf_free(p);
return ERR_OK;
}
/* packet consists of multiple fragments? */
if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
#if IP_REASSEMBLY /* packet fragment reassembly code present? */
LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
/* reassemble the packet*/
p = ip_reass(p);
/* packet not fully reassembled yet? */
if (p == NULL) {
return ERR_OK;
}
iphdr = p->payload;
#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
pbuf_free(p);
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
ntohs(IPH_OFFSET(iphdr))));
IP_STATS_INC(ip.opterr);
IP_STATS_INC(ip.drop);
/* unsupported protocol feature */
snmp_inc_ipinunknownprotos();
return ERR_OK;
#endif /* IP_REASSEMBLY */
}
#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
#if LWIP_IGMP
/* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
if((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
#else
if (iphdr_hlen > IP_HLEN) {
#endif /* LWIP_IGMP */
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
pbuf_free(p);
IP_STATS_INC(ip.opterr);
IP_STATS_INC(ip.drop);
/* unsupported protocol feature */
snmp_inc_ipinunknownprotos();
return ERR_OK;
}
#endif /* IP_OPTIONS_ALLOWED == 0 */
/* send to upper layers */
LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
ip_debug_print(p);
LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
current_netif = inp;
current_header = iphdr;
#if LWIP_RAW
/* raw input did not eat the packet? */
if (raw_input(p, inp) == 0)
#endif /* LWIP_RAW */
{
switch (IPH_PROTO(iphdr)) {
#if LWIP_UDP
case IP_PROTO_UDP:
#if LWIP_UDPLITE
case IP_PROTO_UDPLITE:
#endif /* LWIP_UDPLITE */
snmp_inc_ipindelivers();
udp_input(p, inp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case IP_PROTO_TCP:
snmp_inc_ipindelivers();
tcp_input(p, inp);
break;
#endif /* LWIP_TCP */
#if LWIP_ICMP
case IP_PROTO_ICMP:
snmp_inc_ipindelivers();
icmp_input(p, inp);
break;
#endif /* LWIP_ICMP */
#if LWIP_IGMP
case IP_PROTO_IGMP:
igmp_input(p,inp,&(iphdr->dest));
break;
#endif /* LWIP_IGMP */
default:
#if LWIP_ICMP
/* send ICMP destination protocol unreachable unless is was a broadcast */
if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
!ip_addr_ismulticast(&(iphdr->dest))) {
p->payload = iphdr;
icmp_dest_unreach(p, ICMP_DUR_PROTO);
}
#endif /* LWIP_ICMP */
pbuf_free(p);
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
IP_STATS_INC(ip.proterr);
IP_STATS_INC(ip.drop);
snmp_inc_ipinunknownprotos();
}
}
current_netif = NULL;
current_header = NULL;
return ERR_OK;
}
/**
* Sends an IP packet on a network interface. This function constructs
* the IP header and calculates the IP header checksum. If the source
* IP address is NULL, the IP address of the outgoing network
* interface is filled in as source address.
* If the destination IP address is IP_HDRINCL, p is assumed to already
* include an IP header and p->payload points to it instead of the data.
*
* @param p the packet to send (p->payload points to the data, e.g. next
protocol header; if dest == IP_HDRINCL, p already includes an IP
header and p->payload points to that IP header)
* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
* IP address of the netif used to send is used as source address)
* @param dest the destination IP address to send the packet to
* @param ttl the TTL value to be set in the IP header
* @param tos the TOS value to be set in the IP header
* @param proto the PROTOCOL to be set in the IP header
* @param netif the netif on which to send this packet
* @return ERR_OK if the packet was sent OK
* ERR_BUF if p doesn't have enough space for IP/LINK headers
* returns errors returned by netif->output
*
* @note ip_id: RFC791 "some host may be able to simply use
* unique identifiers independent of destination"
*/
err_t
ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos,
u8_t proto, struct netif *netif)
{
#if IP_OPTIONS_SEND
return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
}
/**
* Same as ip_output_if() but with the possibility to include IP options:
*
* @ param ip_options pointer to the IP options, copied into the IP header
* @ param optlen length of ip_options
*/
err_t ip_output_if_opt(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
u16_t optlen)
{
#endif /* IP_OPTIONS_SEND */
struct ip_hdr *iphdr;
static u16_t ip_id = 0;
snmp_inc_ipoutrequests();
/* Should the IP header be generated or is it already included in p? */
if (dest != IP_HDRINCL) {
u16_t ip_hlen = IP_HLEN;
#if IP_OPTIONS_SEND
u16_t optlen_aligned = 0;
if (optlen != 0) {
/* round up to a multiple of 4 */
optlen_aligned = ((optlen + 3) & ~3);
ip_hlen += optlen_aligned;
/* First write in the IP options */
if (pbuf_header(p, optlen_aligned)) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
IP_STATS_INC(ip.err);
snmp_inc_ipoutdiscards();
return ERR_BUF;
}
MEMCPY(p->payload, ip_options, optlen);
if (optlen < optlen_aligned) {
/* zero the remaining bytes */
memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
}
}
#endif /* IP_OPTIONS_SEND */
/* generate IP header */
if (pbuf_header(p, IP_HLEN)) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
IP_STATS_INC(ip.err);
snmp_inc_ipoutdiscards();
return ERR_BUF;
}
iphdr = p->payload;
LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
(p->len >= sizeof(struct ip_hdr)));
IPH_TTL_SET(iphdr, ttl);
IPH_PROTO_SET(iphdr, proto);
ip_addr_set(&(iphdr->dest), dest);
IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
IPH_LEN_SET(iphdr, htons(p->tot_len));
IPH_OFFSET_SET(iphdr, 0);
IPH_ID_SET(iphdr, htons(ip_id));
++ip_id;
if (ip_addr_isany(src)) {
ip_addr_set(&(iphdr->src), &(netif->ip_addr));
} else {
ip_addr_set(&(iphdr->src), src);
}
IPH_CHKSUM_SET(iphdr, 0);
#if CHECKSUM_GEN_IP
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
#endif
} else {
/* IP header already included in p */
iphdr = p->payload;
dest = &(iphdr->dest);
}
IP_STATS_INC(ip.xmit);
LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
ip_debug_print(p);
#if ENABLE_LOOPBACK
if (ip_addr_cmp(dest, &netif->ip_addr)) {
/* Packet to self, enqueue it for loopback */
LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
return netif_loop_output(netif, p, dest);
}
#endif /* ENABLE_LOOPBACK */
#if IP_FRAG
/* don't fragment if interface has mtu set to 0 [loopif] */
if (netif->mtu && (p->tot_len > netif->mtu)) {
return ip_frag(p,netif,dest);
}
#endif
LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
return netif->output(netif, p, dest);
}
/**
* Simple interface to ip_output_if. It finds the outgoing network
* interface and calls upon ip_output_if to do the actual work.
*
* @param p the packet to send (p->payload points to the data, e.g. next
protocol header; if dest == IP_HDRINCL, p already includes an IP
header and p->payload points to that IP header)
* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
* IP address of the netif used to send is used as source address)
* @param dest the destination IP address to send the packet to
* @param ttl the TTL value to be set in the IP header
* @param tos the TOS value to be set in the IP header
* @param proto the PROTOCOL to be set in the IP header
*
* @return ERR_RTE if no route is found
* see ip_output_if() for more return values
*/
err_t
ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto)
{
struct netif *netif;
if ((netif = ip_route(dest)) == NULL) {
LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
IP_STATS_INC(ip.rterr);
return ERR_RTE;
}
return ip_output_if(p, src, dest, ttl, tos, proto, netif);
}
#if LWIP_NETIF_HWADDRHINT
/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
* before calling ip_output_if.
*
* @param p the packet to send (p->payload points to the data, e.g. next
protocol header; if dest == IP_HDRINCL, p already includes an IP
header and p->payload points to that IP header)
* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
* IP address of the netif used to send is used as source address)
* @param dest the destination IP address to send the packet to
* @param ttl the TTL value to be set in the IP header
* @param tos the TOS value to be set in the IP header
* @param proto the PROTOCOL to be set in the IP header
* @param addr_hint address hint pointer set to netif->addr_hint before
* calling ip_output_if()
*
* @return ERR_RTE if no route is found
* see ip_output_if() for more return values
*/
err_t
ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
{
struct netif *netif;
err_t err;
if ((netif = ip_route(dest)) == NULL) {
LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
IP_STATS_INC(ip.rterr);
return ERR_RTE;
}
netif->addr_hint = addr_hint;
err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
netif->addr_hint = NULL;
return err;
}
#endif /* LWIP_NETIF_HWADDRHINT*/
#if IP_DEBUG
/* Print an IP header by using LWIP_DEBUGF
* @param p an IP packet, p->payload pointing to the IP header
*/
void
ip_debug_print(struct pbuf *p)
{
struct ip_hdr *iphdr = p->payload;
u8_t *payload;
payload = (u8_t *)iphdr + IP_HLEN;
LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
IPH_V(iphdr),
IPH_HL(iphdr),
IPH_TOS(iphdr),
ntohs(IPH_LEN(iphdr))));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
ntohs(IPH_ID(iphdr)),
ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
IPH_TTL(iphdr),
IPH_PROTO(iphdr),
ntohs(IPH_CHKSUM(iphdr))));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
ip4_addr1(&iphdr->src),
ip4_addr2(&iphdr->src),
ip4_addr3(&iphdr->src),
ip4_addr4(&iphdr->src)));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
ip4_addr1(&iphdr->dest),
ip4_addr2(&iphdr->dest),
ip4_addr3(&iphdr->dest),
ip4_addr4(&iphdr->dest)));
LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
}
/* Helper function that processes rx application data stored in rx pbuf chain */
static err_t
altcp_mbedtls_handle_rx_appldata(struct altcp_pcb *conn, altcp_mbedtls_state_t *state)
{
int ret;
LWIP_ASSERT("state != NULL", state != NULL);
if (!(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
/* handshake not done yet */
return ERR_VAL;
}
do {
/* allocate a full-sized unchained PBUF_POOL: this is for RX! */
struct pbuf *buf = pbuf_alloc(PBUF_RAW, PBUF_POOL_BUFSIZE, PBUF_POOL);
if (buf == NULL) {
/* We're short on pbufs, try again later from 'poll' or 'recv' callbacks.
@todo: close on excessive allocation failures or leave this up to upper conn? */
return ERR_OK;
}
/* decrypt application data, this pulls encrypted RX data off state->rx pbuf chain */
ret = mbedtls_ssl_read(&state->ssl_context, (unsigned char *)buf->payload, PBUF_POOL_BUFSIZE);
if (ret < 0) {
if (ret == MBEDTLS_ERR_SSL_CLIENT_RECONNECT) {
/* client is initiating a new connection using the same source port -> close connection or make handshake */
LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("new connection on same source port\n"));
LWIP_ASSERT("TODO: new connection on same source port, close this connection", 0);
} else if ((ret != MBEDTLS_ERR_SSL_WANT_READ) && (ret != MBEDTLS_ERR_SSL_WANT_WRITE)) {
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("connection was closed gracefully\n"));
} else if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("connection was reset by peer\n"));
}
pbuf_free(buf);
return ERR_OK;
} else {
pbuf_free(buf);
return ERR_OK;
}
pbuf_free(buf);
altcp_abort(conn);
return ERR_ABRT;
} else {
err_t err;
if (ret) {
LWIP_ASSERT("bogus receive length", ret <= PBUF_POOL_BUFSIZE);
/* trim pool pbuf to actually decoded length */
pbuf_realloc(buf, (u16_t)ret);
state->bio_bytes_appl += ret;
if (mbedtls_ssl_get_bytes_avail(&state->ssl_context) == 0) {
/* Record is done, now we know the share between application and protocol bytes
and can adjust the RX window by the protocol bytes.
The rest is 'recved' by the application calling our 'recved' fn. */
int overhead_bytes;
LWIP_ASSERT("bogus byte counts", state->bio_bytes_read > state->bio_bytes_appl);
overhead_bytes = state->bio_bytes_read - state->bio_bytes_appl;
altcp_mbedtls_lower_recved(conn->inner_conn, overhead_bytes);
state->bio_bytes_read = 0;
state->bio_bytes_appl = 0;
}
if (state->rx_app == NULL) {
state->rx_app = buf;
} else {
pbuf_cat(state->rx_app, buf);
}
} else {
pbuf_free(buf);
buf = NULL;
}
err = altcp_mbedtls_pass_rx_data(conn, state);
if (err != ERR_OK) {
if (err == ERR_ABRT) {
/* recv callback needs to return this as the pcb is deallocated */
return ERR_ABRT;
}
/* we hide all other errors as we retry feeding the pbuf to the app later */
return ERR_OK;
}
}
} while (ret > 0);
return ERR_OK;
}
/**
* Fragment an IP datagram if too large for the netif.
*
* Chop the datagram in MTU sized chunks and send them in order
* by using a fixed size static memory buffer (PBUF_ROM)
*/
err_t
ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest)
{
struct pbuf *rambuf;
struct pbuf *header;
struct ip_hdr *iphdr;
u16_t nfb = 0;
u16_t left, cop;
u16_t mtu = netif->mtu;
u16_t ofo, omf;
u16_t last;
u16_t poff = IP_HLEN;
u16_t tmp;
/* Get a RAM based MTU sized pbuf */
rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_REF);
if (rambuf == NULL) {
return ERR_MEM;
}
rambuf->tot_len = rambuf->len = mtu;
rambuf->payload = MEM_ALIGN((void *)buf);
/* Copy the IP header in it */
iphdr = rambuf->payload;
memcpy(iphdr, p->payload, IP_HLEN);
/* Save original offset */
tmp = ntohs(IPH_OFFSET(iphdr));
ofo = tmp & IP_OFFMASK;
omf = tmp & IP_MF;
left = p->tot_len - IP_HLEN;
while (left) {
last = (left <= mtu - IP_HLEN);
/* Set new offset and MF flag */
ofo += nfb;
tmp = omf | (IP_OFFMASK & (ofo));
if (!last)
tmp = tmp | IP_MF;
IPH_OFFSET_SET(iphdr, htons(tmp));
/* Fill this fragment */
nfb = (mtu - IP_HLEN) / 8;
cop = last ? left : nfb * 8;
p = copy_from_pbuf(p, &poff, (u8_t *) iphdr + IP_HLEN, cop);
/* Correct header */
IPH_LEN_SET(iphdr, htons(cop + IP_HLEN));
IPH_CHKSUM_SET(iphdr, 0);
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
if (last)
pbuf_realloc(rambuf, left + IP_HLEN);
/* This part is ugly: we alloc a RAM based pbuf for
* the link level header for each chunk and then
* free it.A PBUF_ROM style pbuf for which pbuf_header
* worked would make things simpler.
*/
header = pbuf_alloc(PBUF_LINK, 0, PBUF_RAM);
if (header != NULL) {
pbuf_chain(header, rambuf);
netif->output(netif, header, dest);
IPFRAG_STATS_INC(ip_frag.xmit);
pbuf_free(header);
} else {
pbuf_free(rambuf);
return ERR_MEM;
}
left -= cop;
}
pbuf_free(rambuf);
return ERR_OK;
}
/*
* chap_respond - Generate and send a response to a challenge.
*/
static void chap_respond(ppp_pcb *pcb, int id,
unsigned char *pkt, int len) {
int clen, nlen;
int secret_len;
struct pbuf *p;
u_char *outp;
char rname[MAXNAMELEN+1];
char secret[MAXSECRETLEN+1];
p = pbuf_alloc(PBUF_RAW, (u16_t)(RESP_MAX_PKTLEN), PPP_CTRL_PBUF_TYPE);
if(NULL == p)
return;
if(p->tot_len != p->len) {
pbuf_free(p);
return;
}
if ((pcb->chap_client.flags & (LOWERUP | AUTH_STARTED)) != (LOWERUP | AUTH_STARTED))
return; /* not ready */
if (len < 2 || len < pkt[0] + 1)
return; /* too short */
clen = pkt[0];
nlen = len - (clen + 1);
/* Null terminate and clean remote name. */
ppp_slprintf(rname, sizeof(rname), "%.*v", nlen, pkt + clen + 1);
#if PPP_REMOTENAME
/* Microsoft doesn't send their name back in the PPP packet */
if (pcb->settings.explicit_remote || (pcb->settings.remote_name[0] != 0 && rname[0] == 0))
strlcpy(rname, pcb->settings.remote_name, sizeof(rname));
#endif /* PPP_REMOTENAME */
/* get secret for authenticating ourselves with the specified host */
if (!get_secret(pcb, pcb->chap_client.name, rname, secret, &secret_len, 0)) {
secret_len = 0; /* assume null secret if can't find one */
ppp_warn("No CHAP secret found for authenticating us to %q", rname);
}
outp = (u_char*)p->payload;
MAKEHEADER(outp, PPP_CHAP);
outp += CHAP_HDRLEN;
pcb->chap_client.digest->make_response(pcb, outp, id, pcb->chap_client.name, pkt,
secret, secret_len, pcb->chap_client.priv);
memset(secret, 0, secret_len);
clen = *outp;
nlen = strlen(pcb->chap_client.name);
memcpy(outp + clen + 1, pcb->chap_client.name, nlen);
outp = (u_char*)p->payload + PPP_HDRLEN;
len = CHAP_HDRLEN + clen + 1 + nlen;
outp[0] = CHAP_RESPONSE;
outp[1] = id;
outp[2] = len >> 8;
outp[3] = len;
pbuf_realloc(p, PPP_HDRLEN + len);
ppp_write(pcb, p);
}
err_t
ip_input(struct pbuf *p, struct netif *inp) {
struct ip_hdr *iphdr;
struct netif *netif;
u16_t iphdrlen;
IP_STATS_INC(ip.recv);
snmp_inc_ipinreceives();
/* identify the IP header */
iphdr = p->payload;
if (IPH_V(iphdr) != 4) {
LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
ip_debug_print(p);
pbuf_free(p);
IP_STATS_INC(ip.err);
IP_STATS_INC(ip.drop);
snmp_inc_ipinhdrerrors();
return ERR_OK;
}
/* obtain IP header length in number of 32-bit words */
iphdrlen = IPH_HL(iphdr);
/* calculate IP header length in bytes */
iphdrlen *= 4;
/* header length exceeds first pbuf length? */
if (iphdrlen > p->len) {
LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet droppped.\n",
iphdrlen, p->len));
/* free (drop) packet pbufs */
pbuf_free(p);
IP_STATS_INC(ip.lenerr);
IP_STATS_INC(ip.drop);
snmp_inc_ipindiscards();
return ERR_OK;
}
/* verify checksum */
#if CHECKSUM_CHECK_IP
if (inet_chksum(iphdr, iphdrlen) != 0) {
LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdrlen)));
ip_debug_print(p);
pbuf_free(p);
IP_STATS_INC(ip.chkerr);
IP_STATS_INC(ip.drop);
snmp_inc_ipinhdrerrors();
return ERR_OK;
}
#endif
/* Trim pbuf. This should have been done at the netif layer,
* but we'll do it anyway just to be sure that its done. */
pbuf_realloc(p, ntohs(IPH_LEN(iphdr)));
/* match packet against an interface, i.e. is this packet for us? */
for (netif = netif_list; netif != NULL; netif = netif->next) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
iphdr->dest.addr, netif->ip_addr.addr,
iphdr->dest.addr & netif->netmask.addr,
netif->ip_addr.addr & netif->netmask.addr,
iphdr->dest.addr & ~(netif->netmask.addr)));
/* interface is up and configured? */
if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr))))
{
/* unicast to this interface address? */
if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
/* or broadcast on this interface network address? */
ip_addr_isbroadcast(&(iphdr->dest), netif)) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
}
}
#if LWIP_DHCP
/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
* According to RFC 1542 section 3.1.1, referred by RFC 2131).
*/
if (netif == NULL) {
/* remote port is DHCP server? */
if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdrlen))->dest)));
if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdrlen))->dest) == DHCP_CLIENT_PORT) {
LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n"));
netif = inp;
}
}
}
#endif /* LWIP_DHCP */
/* packet not for us? */
if (netif == NULL) {
/* packet not for us, route or discard */
LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: packet not for us.\n"));
#if IP_FORWARD
/* non-broadcast packet? */
if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
/* try to forward IP packet on (other) interfaces */
ip_forward(p, iphdr, inp);
}
else
#endif /* IP_FORWARD */
{
snmp_inc_ipinaddrerrors();
snmp_inc_ipindiscards();
}
pbuf_free(p);
return ERR_OK;
}
/* packet consists of multiple fragments? */
if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
#if IP_REASSEMBLY /* packet fragment reassembly code present? */
LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
/* reassemble the packet*/
p = ip_reass(p);
/* packet not fully reassembled yet? */
if (p == NULL) {
return ERR_OK;
}
iphdr = p->payload;
#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
pbuf_free(p);
LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
ntohs(IPH_OFFSET(iphdr))));
IP_STATS_INC(ip.opterr);
IP_STATS_INC(ip.drop);
/* unsupported protocol feature */
snmp_inc_ipinunknownprotos();
return ERR_OK;
#endif /* IP_REASSEMBLY */
}
#if IP_OPTIONS == 0 /* no support for IP options in the IP header? */
if (iphdrlen > IP_HLEN) {
LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS == 0).\n"));
pbuf_free(p);
IP_STATS_INC(ip.opterr);
IP_STATS_INC(ip.drop);
/* unsupported protocol feature */
snmp_inc_ipinunknownprotos();
return ERR_OK;
}
#endif /* IP_OPTIONS == 0 */
/* send to upper layers */
LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
ip_debug_print(p);
LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
#if LWIP_RAW
/* raw input did not eat the packet? */
if (raw_input(p, inp) == 0) {
#endif /* LWIP_RAW */
switch (IPH_PROTO(iphdr)) {
#if LWIP_UDP
case IP_PROTO_UDP:
case IP_PROTO_UDPLITE:
snmp_inc_ipindelivers();
udp_input(p, inp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case IP_PROTO_TCP:
snmp_inc_ipindelivers();
tcp_input(p, inp);
break;
#endif /* LWIP_TCP */
case IP_PROTO_ICMP:
snmp_inc_ipindelivers();
icmp_input(p, inp);
break;
default:
/* send ICMP destination protocol unreachable unless is was a broadcast */
if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
!ip_addr_ismulticast(&(iphdr->dest))) {
p->payload = iphdr;
icmp_dest_unreach(p, ICMP_DUR_PROTO);
}
pbuf_free(p);
LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
IP_STATS_INC(ip.proterr);
IP_STATS_INC(ip.drop);
snmp_inc_ipinunknownprotos();
}
#if LWIP_RAW
} /* LWIP_RAW */
#endif
return ERR_OK;
}
void emacps_recv_handler(void *arg)
{
struct pbuf *p;
XEmacPs_Bd *rxbdset, *curbdptr;
struct xemac_s *xemac;
xemacpsif_s *xemacpsif;
XEmacPs_BdRing *rxring;
volatile s32_t bd_processed;
s32_t rx_bytes, k;
u32_t bdindex;
u32_t regval;
xemac = (struct xemac_s *)(arg);
xemacpsif = (xemacpsif_s *)(xemac->state);
rxring = &XEmacPs_GetRxRing(&xemacpsif->emacps);
#ifdef OS_IS_FREERTOS
xInsideISR++;
#endif
/*
* If Reception done interrupt is asserted, call RX call back function
* to handle the processed BDs and then raise the according flag.
*/
regval = XEmacPs_ReadReg(xemacpsif->emacps.Config.BaseAddress, XEMACPS_RXSR_OFFSET);
XEmacPs_WriteReg(xemacpsif->emacps.Config.BaseAddress, XEMACPS_RXSR_OFFSET, regval);
resetrx_on_no_rxdata(xemacpsif);
while(1) {
bd_processed = XEmacPs_BdRingFromHwRx(rxring, XLWIP_CONFIG_N_RX_DESC, &rxbdset);
if (bd_processed <= 0) {
break;
}
for (k = 0, curbdptr=rxbdset; k < bd_processed; k++) {
bdindex = XEMACPS_BD_TO_INDEX(rxring, curbdptr);
p = (struct pbuf *)rx_pbufs_storage[bdindex];
/*
* Adjust the buffer size to the actual number of bytes received.
*/
rx_bytes = XEmacPs_BdGetLength(curbdptr);
pbuf_realloc(p, rx_bytes);
/* store it in the receive queue,
* where it'll be processed by a different handler
*/
if (pq_enqueue(xemacpsif->recv_q, (void*)p) < 0) {
#if LINK_STATS
lwip_stats.link.memerr++;
lwip_stats.link.drop++;
#endif
pbuf_free(p);
} else {
#if !NO_SYS
sys_sem_signal(&xemac->sem_rx_data_available);
#endif
}
curbdptr = XEmacPs_BdRingNext( rxring, curbdptr);
}
/* free up the BD's */
XEmacPs_BdRingFree(rxring, bd_processed, rxbdset);
setup_rx_bds(rxring);
}
#ifdef OS_IS_FREERTOS
xInsideISR--;
#endif
return;
}
/**
* Handle the incoming SLIP stream character by character
*
* Poll the serial layer by calling sio_recv()
*
* @param netif the lwip network interface structure for this slipif
* @param block if 1, block until data is received; if 0, return when all data
* from the buffer is received (multiple calls to this function will
* return a complete packet, NULL is returned before - used for polling)
* @return The IP packet when SLIP_END is received
*/
static struct pbuf *
slipif_input(struct netif *netif, u8_t block)
{
struct slipif_priv *priv;
u8_t c;
struct pbuf *t;
LWIP_ASSERT("netif != NULL", (netif != NULL));
LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
priv = netif->state;
while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
switch (priv->state) {
case SLIP_RECV_NORMAL:
switch (c) {
case SLIP_END:
if (priv->recved > 0) {
/* Received whole packet. */
/* Trim the pbuf to the size of the received packet. */
pbuf_realloc(priv->q, priv->recved);
LINK_STATS_INC(link.recv);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
t = priv->q;
priv->p = priv->q = NULL;
priv->i = priv->recved = 0;
return t;
}
continue;
case SLIP_ESC:
priv->state = SLIP_RECV_ESCAPE;
continue;
}
break;
case SLIP_RECV_ESCAPE:
switch (c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
priv->state = SLIP_RECV_NORMAL;
/* FALLTHROUGH */
}
/* byte received, packet not yet completely received */
if (priv->p == NULL) {
/* allocate a new pbuf */
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
if (priv->p == NULL) {
LINK_STATS_INC(link.drop);
LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
/* don't process any further since we got no pbuf to receive to */
break;
}
if (priv->q != NULL) {
/* 'chain' the pbuf to the existing chain */
pbuf_cat(priv->q, priv->p);
} else {
/* p is the first pbuf in the chain */
priv->q = priv->p;
}
}
/* this automatically drops bytes if > SLIP_MAX_SIZE */
if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
((u8_t *)priv->p->payload)[priv->i] = c;
priv->recved++;
priv->i++;
if (priv->i >= priv->p->len) {
/* on to the next pbuf */
priv->i = 0;
if (priv->p->next != NULL && priv->p->next->len > 0) {
/* p is a chain, on to the next in the chain */
priv->p = priv->p->next;
} else {
/* p is a single pbuf, set it to NULL so next time a new
* pbuf is allocated */
priv->p = NULL;
}
}
}
}
return NULL;
}