| /**************************************************************************** |
| * net/sixlowpan/sixlowpan_tcpsend.c |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <inttypes.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 tcp_conn_s *s_conn; /* Internal connect 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 */ |
| 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_DEFAULT; |
| |
| /* 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, |
| netdev_ipv6_srcaddr(dev, conn->u.ipv6.raddr)); |
| } |
| |
| 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 */ |
| |
| uint32_t rcvseq = tcp_getsequence(conn->rcvseq); |
| uint32_t recvwndo = tcp_get_recvwindow(dev, conn); |
| |
| /* Set the TCP Window */ |
| |
| ipv6tcp->tcp.wnd[0] = recvwndo >> 8; |
| ipv6tcp->tcp.wnd[1] = recvwndo & 0xff; |
| |
| /* Update the Receiver Window */ |
| |
| conn->rcv_adv = rcvseq + recvwndo; |
| } |
| |
| /* 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: 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. |
| * 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 *pvpriv, uint16_t flags) |
| { |
| FAR struct sixlowpan_send_s *sinfo = pvpriv; |
| FAR struct tcp_conn_s *conn = sinfo->s_conn; |
| 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; |
| } |
| |
| /* 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; |
| } |
| |
| /* 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; |
| } |
| |
| ninfo("flags: %04x acked: %" PRIu32 " sent: %zu\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); |
| |
| /* 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=%" PRId32 " sent=%zd buflen=%zd\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) |
| { |
| 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. |
| */ |
| |
| if (_SS_ISCONNECTED(conn->sconn.s_flags)) |
| { |
| /* Report the disconnection event to all socket clones */ |
| |
| tcp_lost_connection(conn, 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->snd_wnd - sinfo->s_sent + sinfo->s_acked; |
| if (sndlen > winleft) |
| { |
| sndlen = winleft; |
| } |
| |
| ninfo("s_buflen=%zu s_sent=%zu mss=%u snd_wnd=%u sndlen=%d\n", |
| sinfo->s_buflen, sinfo->s_sent, conn->mss, conn->snd_wnd, |
| 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 %08" PRIx32 "->%08" PRIx32 "\n", |
| 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->tx_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->tx_unacked += sndlen; |
| |
| #ifdef CONFIG_NET_TCP_WRITE_BUFFERS |
| /* For compatibility with buffered send logic */ |
| |
| conn->sndseq_max = tcp_addsequence(conn->sndseq, conn->tx_unacked); |
| #endif |
| |
| #ifdef CONFIG_NET_STATISTICS |
| g_netstats.tcp.sent++; |
| #endif |
| |
| ninfo("Sent: acked=%" PRId32 " sent=%zd " |
| "buflen=%zd tx_unacked=%" PRId32 "\n", |
| sinfo->s_acked, sinfo->s_sent, sinfo->s_buflen, |
| (uint32_t)conn->tx_unacked); |
| } |
| } |
| |
| /* 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->tx_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 milliseconds |
| * |
| * Returned Value: |
| * Ok is returned on success; Otherwise 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, |
| unsigned int timeout) |
| { |
| struct sixlowpan_send_s sinfo; |
| |
| ninfo("len=%lu timeout=%u\n", (unsigned long)len, timeout); |
| |
| 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); |
| |
| sinfo.s_conn = conn; |
| sinfo.s_result = -EBUSY; |
| 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->tx_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_sem_timedwait will also terminate if a signal is received. |
| */ |
| |
| ninfo("Wait for send complete\n"); |
| |
| for (; ; ) |
| { |
| uint32_t acked = sinfo.s_acked; |
| |
| ret = net_sem_timedwait(&sinfo.s_waitsem, timeout); |
| if (ret != -ETIMEDOUT || acked == sinfo.s_acked) |
| { |
| if (ret == -ETIMEDOUT) |
| { |
| ret = -EAGAIN; |
| } |
| |
| break; /* Timeout without any progress */ |
| } |
| } |
| |
| 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; |
| int ret; |
| |
| ninfo("buflen %lu\n", (unsigned long)buflen); |
| sixlowpan_dumpbuffer("Outgoing TCP payload", buf, buflen); |
| |
| DEBUGASSERT(psock->s_type == SOCK_STREAM); |
| |
| /* Make sure that this is a valid socket */ |
| |
| if (psock == NULL || psock->s_conn == NULL) |
| { |
| nerr("ERROR: Invalid socket\n"); |
| return (ssize_t)-EBADF; |
| } |
| |
| /* Get the underlying TCP connection structure */ |
| |
| conn = psock->s_conn; |
| |
| /* Make sure that this is a connected TCP socket */ |
| |
| if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(conn->sconn.s_flags)) |
| { |
| nerr("ERROR: Not connected\n"); |
| return (ssize_t)-ENOTCONN; |
| } |
| |
| #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(dev, 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; |
| } |
| |
| /* Send the TCP packets, breaking down the potential large user buffer |
| * into smaller packets that can be reassembled in the allocated MTU |
| * packet buffer. |
| */ |
| |
| ret = sixlowpan_send_packet(psock, dev, conn, buf, buflen, &destmac, |
| _SO_TIMEOUT(conn->sconn.s_sndtimeo)); |
| if (ret < 0) |
| { |
| nerr("ERROR: sixlowpan_send_packet() failed: %d\n", ret); |
| return (ssize_t)ret; |
| } |
| |
| return (ssize_t)buflen; |
| } |
| |
| /**************************************************************************** |
| * Name: sixlowpan_tcp_send |
| * |
| * Description: |
| * TCP output comes through three different mechanisms. 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(), |
| * and devif_poll() 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 prototype: %u vs %u\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", |
| dev->d_len, hdrlen); |
| } |
| else |
| { |
| /* Convert the outgoing packet into a frame list. */ |
| |
| buf = (FAR uint8_t *)ipv6 + hdrlen; |
| buflen = dev->d_len - hdrlen; |
| |
| 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 */ |
