12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004 |
- /****************************************************************************
- * net/sixlowpan/sixlowpan_tcpsend.c
- *
- * Copyright (C) 2017-2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <string.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include "nuttx/semaphore.h"
- #include "nuttx/net/netdev.h"
- #include "nuttx/net/radiodev.h"
- #include "nuttx/net/netstats.h"
- #include "netdev/netdev.h"
- #include "devif/devif.h"
- #include "socket/socket.h"
- #include "inet/inet.h"
- #include "icmpv6/icmpv6.h"
- #include "tcp/tcp.h"
- #include "utils/utils.h"
- #include "sixlowpan/sixlowpan_internal.h"
- #if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_NET_TCP)
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* Buffer access helpers */
- #define TCPBUF(dev) ((FAR struct tcp_hdr_s *)(&(dev)->d_buf[IPv6_HDRLEN]))
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* These are temporary stubs. Something like this would be needed to
- * monitor the health of a IPv6 neighbor.
- */
- #define neighbor_reachable(dev)
- #define neighbor_notreachable(dev)
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /* This is the state data provided to the send event handler. No actions
- * can be taken until the until we receive the TX poll, then we can call
- * sixlowpan_queue_frames() with this data strurcture.
- */
- struct sixlowpan_send_s
- {
- FAR struct socket *s_sock; /* Internal socket reference */
- FAR struct devif_callback_s *s_cb; /* Reference to callback instance */
- sem_t s_waitsem; /* Supports waiting for driver events */
- int s_result; /* The result of the transfer */
- uint16_t s_timeout; /* Send timeout in deciseconds */
- clock_t s_time; /* Last send time for determining timeout */
- FAR const struct netdev_varaddr_s *s_destmac; /* Destination MAC address */
- FAR const uint8_t *s_buf; /* Data to send */
- size_t s_buflen; /* Length of data in buf */
- ssize_t s_sent; /* The number of bytes sent */
- uint32_t s_isn; /* Initial sequence number */
- uint32_t s_acked; /* The number of bytes acked */
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: sixlowpan_tcp_chksum
- *
- * Description:
- * Perform the checksum calcaultion over the IPv6, protocol headers, and
- * data payload as necessary.
- *
- * Input Parameters:
- * ipv6tcp - A reference to a structure containing the IPv6 and TCP headers.
- * buf - The beginning of the payload data
- * buflen - The length of the payload data.
- *
- * Returned Value:
- * The calculated checksum
- *
- ****************************************************************************/
- static uint16_t sixlowpan_tcp_chksum(FAR const struct ipv6tcp_hdr_s *ipv6tcp,
- FAR const uint8_t *buf, uint16_t buflen)
- {
- uint16_t upperlen;
- uint16_t tcplen;
- uint16_t sum;
- /* The length reported in the IPv6 header is the length of the payload
- * that follows the header.
- */
- upperlen = ((uint16_t)ipv6tcp->ipv6.len[0] << 8) + ipv6tcp->ipv6.len[1];
- /* Verify some minimal assumptions */
- if (upperlen > CONFIG_NET_6LOWPAN_PKTSIZE)
- {
- return 0;
- }
- /* The checksum is calculated starting with a pseudo-header of IPv6 header
- * fields according to the IPv6 standard, which consists of the source
- * and destination addresses, the packet length and the next header field.
- */
- sum = upperlen + ipv6tcp->ipv6.proto;
- /* Sum IP source and destination addresses. */
- sum = chksum(sum, (FAR uint8_t *)ipv6tcp->ipv6.srcipaddr,
- 2 * sizeof(net_ipv6addr_t));
- /* Sum the TCP header
- *
- * The TCP header length is encoded in the top 4 bits of the tcpoffset
- * field (in units of 32-bit words).
- */
- tcplen = ((uint16_t)ipv6tcp->tcp.tcpoffset >> 4) << 2;
- sum = chksum(sum, (FAR uint8_t *)&ipv6tcp->tcp, tcplen);
- /* Sum payload data. */
- sum = chksum(sum, buf, buflen);
- return (sum == 0) ? 0xffff : htons(sum);
- }
- /****************************************************************************
- * Name: sixlowpan_tcp_header
- *
- * Description:
- * sixlowpan_tcp_header() will construct the IPv6 and TCP headers
- *
- * Input Parameters:
- * conn - An instance of the TCP connection structure.
- * dev - The network device that will route the packet
- * buf - Data to send
- * bulen - Length of data to send
- * ipv6tcp - The location to save the IPv6 + TCP header
- *
- * Returned Value:
- * Zero (OK) is returned on success; a negated errno value is returned on
- * failure.
- *
- * Assumptions:
- * Called with the network locked.
- *
- ****************************************************************************/
- static int sixlowpan_tcp_header(FAR struct tcp_conn_s *conn,
- FAR struct net_driver_s *dev,
- FAR const void *buf, size_t buflen,
- FAR struct ipv6tcp_hdr_s *ipv6tcp)
- {
- uint16_t iplen;
- /* Initialize the IPv6/TCP headers */
- ipv6tcp->ipv6.vtc = 0x60;
- ipv6tcp->ipv6.tcf = 0x00;
- ipv6tcp->ipv6.flow = 0x00;
- ipv6tcp->ipv6.proto = IP_PROTO_TCP;
- ipv6tcp->ipv6.ttl = IP_TTL;
- /* The IPv6 header length field does not include the size of IPv6 IP
- * header.
- */
- iplen = buflen + TCP_HDRLEN;
- ipv6tcp->ipv6.len[0] = (iplen >> 8);
- ipv6tcp->ipv6.len[1] = (iplen & 0xff);
- /* Copy the source and destination addresses */
- net_ipv6addr_hdrcopy(ipv6tcp->ipv6.destipaddr, conn->u.ipv6.raddr);
- if (!net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
- {
- net_ipv6addr_hdrcopy(ipv6tcp->ipv6.srcipaddr, conn->u.ipv6.laddr);
- }
- else
- {
- net_ipv6addr_hdrcopy(ipv6tcp->ipv6.srcipaddr, dev->d_ipv6addr);
- }
- ninfo("IPv6 length: %d\n",
- ((int)ipv6tcp->ipv6.len[0] << 8) + ipv6tcp->ipv6.len[1]);
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.ipv6.sent++;
- #endif
- /* Initialize the TCP header */
- ipv6tcp->tcp.srcport = conn->lport; /* Local port */
- ipv6tcp->tcp.destport = conn->rport; /* Connected remote port */
- ipv6tcp->tcp.tcpoffset = (TCP_HDRLEN / 4) << 4; /* No optdata */
- ipv6tcp->tcp.flags = TCP_ACK | TCP_PSH; /* No urgent data */
- ipv6tcp->tcp.urgp[0] = 0; /* No urgent data */
- ipv6tcp->tcp.urgp[1] = 0;
- /* Set the sequency number information */
- /* REVISIT: There is currently no wait for the data to be ACKed and,
- * hence, no mechanism to retransmit the packet.
- */
- memcpy(ipv6tcp->tcp.ackno, conn->rcvseq, 4); /* ACK number */
- memcpy(ipv6tcp->tcp.seqno, conn->sndseq, 4); /* Sequence number */
- /* Set the TCP window */
- if (conn->tcpstateflags & TCP_STOPPED)
- {
- /* If the connection has issued TCP_STOPPED, we advertise a zero
- * window so that the remote host will stop sending data.
- */
- ipv6tcp->tcp.wnd[0] = 0;
- ipv6tcp->tcp.wnd[1] = 0;
- }
- else
- {
- /* Update the TCP received window based on I/O buffer availability */
- uint16_t recvwndo = tcp_get_recvwindow(dev);
- /* Set the TCP Window */
- ipv6tcp->tcp.wnd[0] = recvwndo >> 8;
- ipv6tcp->tcp.wnd[1] = recvwndo & 0xff;
- }
- /* Calculate TCP checksum. */
- ipv6tcp->tcp.tcpchksum = 0;
- ipv6tcp->tcp.tcpchksum = ~sixlowpan_tcp_chksum(ipv6tcp, buf, buflen);
- ninfo("Outgoing TCP packet length: %d bytes\n", iplen + IPv6_HDRLEN);
- return OK;
- }
- /****************************************************************************
- * Name: send_timeout
- *
- * Description:
- * Check for send timeout.
- *
- * Input Parameters:
- * sinfo - Send state structure reference
- *
- * Returned Value:
- * TRUE:timeout FALSE:no timeout
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- static inline bool send_timeout(FAR struct sixlowpan_send_s *sinfo)
- {
- /* Check for a timeout. Zero means none and, in that case, we will let
- * the send wait forever.
- */
- if (sinfo->s_timeout != 0)
- {
- /* Check if the configured timeout has elapsed */
- clock_t timeo_ticks = DSEC2TICK(sinfo->s_timeout);
- clock_t elapsed = clock_systimer() - sinfo->s_time;
- if (elapsed >= timeo_ticks)
- {
- return true;
- }
- }
- /* No timeout */
- return false;
- }
- /****************************************************************************
- * Name: tcp_send_eventhandler
- *
- * Description:
- * This function is called with the network locked to perform the actual
- * TCP send operation when polled by the lower, device interfacing layer.
- *
- * Input Parameters:
- * dev - The structure of the network driver that generated the event.
- * pvconn - The connection structure associated with the socket
- * pvpriv - The event handler's private data argument
- * flags - Set of events describing why the callback was invoked
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- static uint16_t tcp_send_eventhandler(FAR struct net_driver_s *dev,
- FAR void *pvconn,
- FAR void *pvpriv, uint16_t flags)
- {
- FAR struct sixlowpan_send_s *sinfo = (FAR struct sixlowpan_send_s *)pvpriv;
- FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
- struct ipv6tcp_hdr_s ipv6tcp;
- int ret;
- /* Verify that this is an IEEE802.15.4 network driver. */
- if (dev->d_lltype != NET_LL_IEEE802154 &&
- dev->d_lltype != NET_LL_PKTRADIO)
- {
- ninfo("Not a compatible network device\n");
- return flags;
- }
- /* The TCP socket is connected and, hence, should be bound to a device.
- * Make sure that the polling device is the one that we are bound to.
- */
- DEBUGASSERT(conn->dev != NULL);
- if (dev != conn->dev)
- {
- ninfo("Not the connected device\n");
- return flags;
- }
- /* Check if the IEEE802.15.4 network driver went down */
- if ((flags & NETDEV_DOWN) != 0)
- {
- nwarn("WARNING: Device is down\n");
- sinfo->s_result = -ENOTCONN;
- goto end_wait;
- }
- ninfo("flags: %04x acked: %u sent: %u\n",
- flags, sinfo->s_acked, sinfo->s_sent);
- /* If this packet contains an acknowledgement, then update the count of
- * acknowledged bytes.
- */
- if ((flags & TCP_ACKDATA) != 0)
- {
- FAR struct tcp_hdr_s *tcp = TCPBUF(dev);
- #ifdef CONFIG_NET_SOCKOPTS
- /* Update the timeout */
- sinfo->s_time = clock_systimer();
- #endif
- /* The current acknowledgement number number is the (relative) offset
- * of the of the next byte needed by the receiver. The s_isn is the
- * offset of the first byte to send to the receiver. The difference
- * is the number of bytes to be acknowledged.
- */
- sinfo->s_acked = tcp_getsequence(tcp->ackno) - sinfo->s_isn;
- ninfo("ACK: acked=%d sent=%d buflen=%d\n",
- sinfo->s_acked, sinfo->s_sent, sinfo->s_buflen);
- /* Have all of the bytes in the buffer been sent and acknowledged? */
- if (sinfo->s_acked >= sinfo->s_buflen)
- {
- /* Yes. Then sinfo->s_buflen should hold the number of bytes
- * actually sent.
- */
- sinfo->s_result = sinfo->s_sent;
- goto end_wait;
- }
- /* No.. fall through to send more data if necessary */
- }
- /* Check if we are being asked to retransmit data */
- else if ((flags & TCP_REXMIT) != 0)
- {
- /* Yes.. in this case, reset the number of bytes that have been sent
- * to the number of bytes that have been ACKed.
- */
- sinfo->s_sent = sinfo->s_acked;
- /* Fall through to re-send data from the last that was ACKed */
- }
- /* Check for a loss of connection */
- else if ((flags & TCP_DISCONN_EVENTS) != 0)
- {
- FAR struct socket *psock = sinfo->s_sock;
- nwarn("WARNING: Lost connection\n");
- /* We could get here recursively through the callback actions of
- * tcp_lost_connection(). So don't repeat that action if we have
- * already been disconnected.
- */
- DEBUGASSERT(psock != NULL);
- if (_SS_ISCONNECTED(psock->s_flags))
- {
- /* Report the disconnection event to all socket clones */
- tcp_lost_connection(psock, sinfo->s_cb, flags);
- }
- /* Report not connected to the sender */
- sinfo->s_result = -ENOTCONN;
- goto end_wait;
- }
- /* Check if the outgoing packet is available (it may have been claimed
- * by a sendto event handler serving a different thread).
- */
- #if 0 /* We can't really support multiple senders on the same TCP socket */
- else if (dev->d_sndlen > 0)
- {
- /* Another thread has beat us sending data, wait for the next poll */
- return flags;
- }
- #endif
- /* We get here if (1) not all of the data has been ACKed, (2) we have been
- * asked to retransmit data, (3) the connection is still healthy, and (4)
- * the outgoing packet is available for our use. In this case, we are
- * now free to send more data to receiver -- UNLESS the buffer contains
- * unprocessed incoming data. In that event, we will have to wait for the
- * next polling cycle.
- */
- if ((flags & WPAN_NEWDATA) == 0 && sinfo->s_sent < sinfo->s_buflen)
- {
- uint32_t seqno;
- uint16_t winleft;
- uint16_t sndlen;
- /* Get the amount of TCP payload data that we can send in the next
- * packet.
- */
- sndlen = sinfo->s_buflen - sinfo->s_sent;
- if (sndlen > conn->mss)
- {
- sndlen = conn->mss;
- }
- winleft = conn->winsize - sinfo->s_sent + sinfo->s_acked;
- if (sndlen > winleft)
- {
- sndlen = winleft;
- }
- ninfo("s_buflen=%u s_sent=%u mss=%u winsize=%u sndlen=%d\n",
- sinfo->s_buflen, sinfo->s_sent, conn->mss, conn->winsize, sndlen);
- if (sndlen > 0)
- {
- /* Set the sequence number for this packet. NOTE: The network updates
- * sndseq on receipt of ACK *before* this function is called. In that
- * case sndseq will point to the next unacknowledged byte (which might
- * have already been sent). We will overwrite the value of sndseq
- * here before the packet is sent.
- */
- seqno = sinfo->s_sent + sinfo->s_isn;
- ninfo("Sending: sndseq %08lx->%08x\n",
- (unsigned long)tcp_getsequence(conn->sndseq), seqno);
- tcp_setsequence(conn->sndseq, seqno);
- /* Create the IPv6 + TCP header */
- ret = sixlowpan_tcp_header(conn, dev, &sinfo->s_buf[sinfo->s_sent],
- sndlen, &ipv6tcp);
- if (ret < 0)
- {
- nerr("ERROR: sixlowpan_tcp_header failed: %d\n", ret);
- sinfo->s_result = ret;
- goto end_wait;
- }
- /* Transfer the frame list to the IEEE802.15.4 MAC device */
- ret = sixlowpan_queue_frames((FAR struct radio_driver_s *)dev,
- &ipv6tcp.ipv6,
- &sinfo->s_buf[sinfo->s_sent], sndlen,
- sinfo->s_destmac);
- if (ret < 0)
- {
- nerr("ERROR: sixlowpan_queue_frames failed: %d\n", ret);
- sinfo->s_result = ret;
- goto end_wait;
- }
- /* Increment the count of bytes sent, the number of unacked bytes,
- * and the total count of TCP packets sent.
- *
- * NOTE: tcp_appsend() normally increments conn->unacked based on
- * the value of dev->d_sndlen. However, dev->d_len is always
- * zero for 6LoWPAN since it does not send via the dev->d_buf
- * but, rather, uses a backdoor frame interface with the IEEE
- * 802.15.4 MAC.
- */
- sinfo->s_sent += sndlen;
- conn->unacked += sndlen;
- #ifdef CONFIG_NET_TCP_WRITE_BUFFERS
- /* For compability with buffered send logic */
- conn->sndseq_max = tcp_addsequence(conn->sndseq, conn->unacked);
- #endif
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.tcp.sent++;
- #endif
- ninfo("Sent: acked=%d sent=%d buflen=%d unacked=%d\n",
- sinfo->s_acked, sinfo->s_sent, sinfo->s_buflen,
- conn->unacked);
- }
- }
- #ifdef CONFIG_NET_SOCKOPTS
- /* All data has been sent and we are just waiting for ACK or re-transmit
- * indications to complete the send. Check for a timeout.
- */
- if (send_timeout(sinfo))
- {
- /* Yes.. report the timeout */
- nwarn("WARNING: SEND timeout\n");
- sinfo->s_sent = -ETIMEDOUT;
- goto end_wait;
- }
- #endif /* CONFIG_NET_SOCKOPTS */
- /* Continue waiting */
- return flags;
- end_wait:
- /* Do not allow any further callbacks */
- sinfo->s_cb->flags = 0;
- sinfo->s_cb->priv = NULL;
- sinfo->s_cb->event = NULL;
- /* There are no outstanding, unacknowledged bytes */
- conn->unacked = 0;
- /* Wake up the waiting thread */
- nxsem_post(&sinfo->s_waitsem);
- return flags;
- }
- /****************************************************************************
- * Name: sixlowpan_send_packet
- *
- * Description:
- * Process an outgoing TCP packet. Takes an IP packet and formats it to
- * be sent on an 802.15.4 network using 6lowpan. Called from common TCP
- * send logic.
- *
- * The payload data is in the caller 'buf' and is of length 'buflen'.
- * Compressed headers will be added and if necessary the packet is
- * fragmented. The resulting packet/fragments are submitted to the MAC
- * via the network driver r_req_data method.
- *
- * Input Parameters:
- * psock - An instance of the internal socket structure.
- * dev - The IEEE802.15.4 MAC network driver interface.
- * conn - TCP connection structure
- * buf - Data to send
- * len - Length of data to send
- * destmac - The IEEE802.15.4 MAC address of the destination
- * timeout - Send timeout in deciseconds
- *
- * Returned Value:
- * Ok is returned on success; Othewise a negated errno value is returned.
- * This function is expected to fail if the driver is not an IEEE802.15.4
- * MAC network driver. In that case, the logic will fall back to normal
- * IPv4/IPv6 formatting.
- *
- * Assumptions:
- * Called with the network locked.
- *
- ****************************************************************************/
- static int sixlowpan_send_packet(FAR struct socket *psock,
- FAR struct net_driver_s *dev,
- FAR struct tcp_conn_s *conn,
- FAR const uint8_t *buf, size_t len,
- FAR const struct netdev_varaddr_s *destmac,
- uint16_t timeout)
- {
- struct sixlowpan_send_s sinfo;
- ninfo("len=%lu timeout=%u\n", (unsigned long)len, timeout);
- DEBUGASSERT(psock != NULL && dev != NULL && conn != NULL && buf != NULL &&
- destmac != NULL);
- memset(&sinfo, 0, sizeof(struct sixlowpan_send_s));
- net_lock();
- if (len > 0)
- {
- /* Allocate resources to receive a callback.
- *
- * The second parameter is NULL meaning that we can get only
- * device related events, no connect-related events.
- */
- sinfo.s_cb = tcp_callback_alloc(conn);
- if (sinfo.s_cb != NULL)
- {
- int ret;
- /* Initialize the send state structure */
- nxsem_init(&sinfo.s_waitsem, 0, 0);
- (void)nxsem_setprotocol(&sinfo.s_waitsem, SEM_PRIO_NONE);
- sinfo.s_sock = psock;
- sinfo.s_result = -EBUSY;
- sinfo.s_timeout = timeout;
- sinfo.s_time = clock_systimer();
- sinfo.s_destmac = destmac;
- sinfo.s_buf = buf;
- sinfo.s_buflen = len;
- /* Set up the initial sequence number */
- sinfo.s_isn = tcp_getsequence(conn->sndseq);
- /* Set up the callback in the connection */
- sinfo.s_cb->flags = (NETDEV_DOWN | TCP_ACKDATA | TCP_REXMIT |
- TCP_DISCONN_EVENTS | WPAN_POLL);
- sinfo.s_cb->priv = (FAR void *)&sinfo;
- sinfo.s_cb->event = tcp_send_eventhandler;
- /* There is no outstanding, unacknowledged data after this
- * initial sequence number.
- */
- conn->unacked = 0;
- /* Notify the IEEE802.15.4 MAC that we have data to send. */
- netdev_txnotify_dev(dev);
- /* Wait for the send to complete or an error to occur.
- * net_lockedwait will also terminate if a signal is received.
- */
- ninfo("Wait for send complete\n");
- ret = net_lockedwait(&sinfo.s_waitsem);
- if (ret < 0)
- {
- sinfo.s_result = ret;
- }
- /* Make sure that no further events are processed */
- tcp_callback_free(conn, sinfo.s_cb);
- }
- }
- nxsem_destroy(&sinfo.s_waitsem);
- net_unlock();
- return (sinfo.s_result < 0 ? sinfo.s_result : len);
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: psock_6lowpan_tcp_send
- *
- * Description:
- * psock_6lowpan_tcp_send() call may be used only when the TCP socket is in a
- * connected state (so that the intended recipient is known).
- *
- * Input Parameters:
- * psock - An instance of the internal socket structure.
- * buf - Data to send
- * bulen - Length of data to send
- *
- * Returned Value:
- * On success, returns the number of characters sent. On error,
- * -1 is returned, and errno is set appropriately. Returned error numbers
- * must be consistent with definition of errors reported by send() or
- * sendto().
- *
- * Assumptions:
- * Called with the network locked.
- *
- ****************************************************************************/
- ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
- size_t buflen)
- {
- FAR struct tcp_conn_s *conn;
- FAR struct net_driver_s *dev;
- struct netdev_varaddr_s destmac;
- uint16_t timeout;
- int ret;
- ninfo("buflen %lu\n", (unsigned long)buflen);
- sixlowpan_dumpbuffer("Outgoing TCP payload", buf, buflen);
- DEBUGASSERT(psock != NULL && psock->s_crefs > 0);
- DEBUGASSERT(psock->s_type == SOCK_STREAM);
- /* Make sure that this is a valid socket */
- if (psock == NULL || psock->s_crefs <= 0)
- {
- nerr("ERROR: Invalid socket\n");
- return (ssize_t)-EBADF;
- }
- /* Make sure that this is a connected TCP socket */
- if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
- {
- nerr("ERROR: Not connected\n");
- return (ssize_t)-ENOTCONN;
- }
- /* Get the underlying TCP connection structure */
- conn = (FAR struct tcp_conn_s *)psock->s_conn;
- DEBUGASSERT(conn != NULL);
- #ifdef CONFIG_NET_IPv4
- /* Ignore if not IPv6 domain */
- if (conn->domain != PF_INET6)
- {
- nwarn("WARNING: Not IPv6\n");
- return (ssize_t)-EPROTOTYPE;
- }
- #endif
- /* Route outgoing message to the correct device */
- dev = netdev_findby_ripv6addr(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
- if (dev == NULL)
- {
- nwarn("WARNING: Not routable\n");
- return (ssize_t)-ENETUNREACH;
- }
- /* Some network devices support different link layer protocols.
- * Check if this device has the hooks to support 6LoWPAN.
- */
- if (dev->d_lltype != NET_LL_IEEE802154 &&
- dev->d_lltype != NET_LL_PKTRADIO)
- {
- nwarn("WARNING: Not a compatible network device\n");
- return (ssize_t)-ENONET;
- }
- #ifdef CONFIG_NET_ICMPv6_NEIGHBOR
- /* Make sure that the IP address mapping is in the Neighbor Table */
- ret = icmpv6_neighbor(conn->u.ipv6.raddr);
- if (ret < 0)
- {
- nerr("ERROR: Not reachable\n");
- return (ssize_t)-ENETUNREACH;
- }
- #endif
- /* Get the IEEE 802.15.4 MAC address of the next hop. */
- ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)dev,
- conn->u.ipv6.raddr, &destmac);
- if (ret < 0)
- {
- nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
- return (ssize_t)ret;
- }
- /* Set the socket state to sending */
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
- /* Send the TCP packets, breaking down the potential large user buffer
- * into smaller packets that can be reassembled in the allocated MTU
- * packet buffer.
- */
- #ifdef CONFIG_NET_SOCKOPTS
- timeout = psock->s_sndtimeo;
- #else
- timeout = 0;
- #endif
- ret = sixlowpan_send_packet(psock, dev, conn, buf, buflen, &destmac,
- timeout);
- if (ret < 0)
- {
- nerr("ERROR: sixlowpan_send_packet() failed: %d\n", ret);
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
- return (ssize_t)ret;
- }
- /* Set the socket state to idle */
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
- return (ssize_t)buflen;
- }
- /****************************************************************************
- * Name: sixlowpan_tcp_send
- *
- * Description:
- * TCP output comes through three different mechansims. Either from:
- *
- * 1. TCP socket output. For the case of TCP output to an
- * IEEE802.15.4, the TCP output is caught in the socket
- * send()/sendto() logic and and redirected to psock_6lowpan_tcp_send().
- * 2. TCP output from the TCP state machine. That will occur
- * during TCP packet processing by the TCP state meachine.
- * 3. TCP output resulting from TX or timer polling
- *
- * Cases 2 and 3 will be handled here. Logic in ipv6_tcp_input(),
- * devif_poll(), and devif_timer() detect if (1) an attempt to return with
- * d_len > 0 and (2) that the device is an IEEE802.15.4 MAC network
- * driver. Under those conditions, this function will be called to create
- * the IEEE80215.4 frames.
- *
- * Input Parameters:
- * dev - The network device containing the packet to be sent.
- * fwddev - The network device used to send the data. This will be the
- * same device except for the IP forwarding case where packets
- * are sent across devices.
- * ipv6 - A pointer to the IPv6 header in dev->d_buf which lies AFTER
- * the L1 header. NOTE: dev->d_len must have been decremented
- * by the size of any preceding MAC header.
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * Called with the network locked.
- *
- ****************************************************************************/
- void sixlowpan_tcp_send(FAR struct net_driver_s *dev,
- FAR struct net_driver_s *fwddev,
- FAR struct ipv6_hdr_s *ipv6)
- {
- DEBUGASSERT(dev != NULL && dev->d_len > 0 && fwddev != NULL);
- /* Double check */
- ninfo("d_len %u\n", dev->d_len);
- sixlowpan_dumpbuffer("Outgoing TCP packet",
- (FAR const uint8_t *)ipv6, dev->d_len);
- if (dev != NULL && dev->d_len > 0 && fwddev != NULL)
- {
- FAR struct ipv6tcp_hdr_s *ipv6hdr;
- /* The IPv6 header followed by a TCP headers should lie at the
- * beginning of d_buf since there is no link layer protocol header
- * and the TCP state machine should only response with TCP packets.
- */
- ipv6hdr = (FAR struct ipv6tcp_hdr_s *)ipv6;
- /* The TCP data payload should follow the IPv6 header plus the
- * protocol header.
- */
- if (ipv6hdr->ipv6.proto != IP_PROTO_TCP)
- {
- nwarn("WARNING: Expected TCP protoype: %u vs %s\n",
- ipv6hdr->ipv6.proto, IP_PROTO_TCP);
- }
- else
- {
- struct netdev_varaddr_s destmac;
- FAR uint8_t *buf;
- uint16_t hdrlen;
- uint16_t buflen;
- int ret;
- /* Get the IEEE 802.15.4 MAC address of the next hop. */
- ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)fwddev,
- ipv6hdr->ipv6.destipaddr, &destmac);
- if (ret < 0)
- {
- nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
- goto drop;
- }
- /* Get the IPv6 + TCP combined header length. The size of the TCP
- * header is encoded in the top 4 bits of the tcpoffset field (in
- * units of 32-bit words).
- */
- hdrlen = IPv6_HDRLEN + (((uint16_t)ipv6hdr->tcp.tcpoffset >> 4) << 2);
- /* Drop the packet if the buffer length is less than this. */
- if (hdrlen > dev->d_len)
- {
- nwarn("WARNING: Dropping small TCP packet: %u < %u\n",
- buflen, hdrlen);
- }
- else
- {
- /* Convert the outgoing packet into a frame list. */
- buf = (FAR uint8_t *)ipv6 + hdrlen;
- buflen = dev->d_len - hdrlen;
- (void)sixlowpan_queue_frames(
- (FAR struct radio_driver_s *)fwddev,
- &ipv6hdr->ipv6, buf, buflen, &destmac);
- }
- }
- }
- drop:
- dev->d_len = 0;
- }
- #endif /* CONFIG_NET_6LOWPAN && CONFIG_NET_TCP */
|