465 lines
14 KiB
C
465 lines
14 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_sendmsg.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/icmpv6.h>
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#include "utils/utils.h"
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#include "socket/socket.h"
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "inet/inet.h"
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_SOCKET
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define IPv6BUF \
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((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6BUF \
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((FAR struct icmpv6_echo_request_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct icmpv6_sendto_s
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{
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FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
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sem_t snd_sem; /* Use to manage the wait for send
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* complete */
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struct in6_addr snd_toaddr; /* The peer to send the request to */
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FAR const uint8_t *snd_buf; /* ICMPv6 header + data payload */
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uint16_t snd_buflen; /* Size of the ICMPv6 header + data
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* payload */
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int16_t snd_result; /* 0: success; <0:negated errno on
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* fail */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sendto_request
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*
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* Description:
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* Setup to send an ICMPv6 request packet
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* pstate - Reference to an instance of the ICMPv6 sendto state structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static void sendto_request(FAR struct net_driver_s *dev,
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FAR struct icmpv6_sendto_s *pstate)
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{
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FAR struct ipv6_hdr_s *ipv6;
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FAR struct icmpv6_echo_request_s *icmpv6;
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IFF_SET_IPv6(dev->d_flags);
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/* The total length to send is the size of the application data plus the
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* IP and ICMPv6 headers (and, eventually, the Ethernet header)
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*/
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dev->d_len = IPv6_HDRLEN + pstate->snd_buflen;
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/* The total size of the data (including the size of the ICMPv6 header) */
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dev->d_sndlen += pstate->snd_buflen;
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/* Set up the IPv6 header (most is probably already in place) */
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ipv6 = IPv6BUF;
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ipv6->vtc = 0x60; /* Version/traffic class (MS) */
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ipv6->tcf = 0; /* Traffic class(LS)/Flow label(MS) */
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ipv6->flow = 0; /* Flow label (LS) */
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ipv6->len[0] = (pstate->snd_buflen >> 8); /* Length excludes the IPv6 header */
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ipv6->len[1] = (pstate->snd_buflen & 0xff);
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ipv6->proto = IP_PROTO_ICMP6; /* Next header */
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ipv6->ttl = 255; /* Hop limit */
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net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
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net_ipv6addr_hdrcopy(ipv6->destipaddr, pstate->snd_toaddr.s6_addr16);
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/* Copy the ICMPv6 request and payload into place after the IPv6 header */
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icmpv6 = ICMPv6BUF;
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memcpy(icmpv6, pstate->snd_buf, pstate->snd_buflen);
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/* Calculate the ICMPv6 checksum over the ICMPv6 header and payload. */
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icmpv6->chksum = 0;
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icmpv6->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
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if (icmpv6->chksum == 0)
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{
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icmpv6->chksum = 0xffff;
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}
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ninfo("Outgoing ICMPv6 packet length: %d (%d)\n",
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dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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}
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/****************************************************************************
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* Name: sendto_eventhandler
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*
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* Description:
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* This function is called with the network locked to perform the actual
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* ECHO request and/or ECHO reply actions when polled by the lower, device
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* interfacing layer.
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*
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* Input Parameters:
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* dev The structure of the network driver that generated the
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* event
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* pvconn The received packet, cast to (void *)
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* pvpriv An instance of struct icmpv6_sendto_s cast to (void *)
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* Modified value of the input flags
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static uint16_t sendto_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct icmpv6_sendto_s *pstate = (struct icmpv6_sendto_s *)pvpriv;
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ninfo("flags: %04x\n", flags);
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if (pstate != NULL)
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{
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/* Check if the network is still up */
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if ((flags & NETDEV_DOWN) != 0)
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{
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nerr("ERROR: Interface is down\n");
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pstate->snd_result = -ENETUNREACH;
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goto end_wait;
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}
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/* Check:
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* If the outgoing packet is available (it may have been claimed
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* by a sendto event handler serving a different thread)
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* -OR-
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* If the output buffer currently contains unprocessed incoming
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* data.
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* -OR-
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* If we have already sent the ECHO request
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*
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* In the first two cases, we will just have to wait for the next
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* polling cycle.
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*/
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if (dev->d_sndlen <= 0 && /* Packet available */
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(flags & ICMPv6_NEWDATA) == 0) /* No incoming data */
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{
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/* Send the ICMPv6 echo request. */
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ninfo("Send ICMPv6 ECHO request\n");
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sendto_request(dev, pstate);
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pstate->snd_result = OK;
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goto end_wait;
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}
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/* Continue waiting */
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}
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return flags;
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end_wait:
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ninfo("Resuming\n");
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/* Do not allow any further callbacks */
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pstate->snd_cb->flags = 0;
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pstate->snd_cb->priv = NULL;
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pstate->snd_cb->event = NULL;
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/* Wake up the waiting thread */
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nxsem_post(&pstate->snd_sem);
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_sendmsg
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*
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* Description:
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* Implements the sendmsg() operation for the case of the IPPROTO_ICMP6
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* socket. The 'buf' parameter points to a block of memory that includes
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* an ICMPv6 request header, followed by any payload that accompanies the
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* request. The 'len' parameter includes both the size of the ICMPv6
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* header and the following payload.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* msg Message to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error, a negated
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* errno value is returned (see sendmsg() for the list of appropriate error
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* values.
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*
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****************************************************************************/
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ssize_t icmpv6_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
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int flags)
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{
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FAR const void *buf = msg->msg_iov->iov_base;
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size_t len = msg->msg_iov->iov_len;
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FAR const struct sockaddr *to = msg->msg_name;
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socklen_t tolen = msg->msg_namelen;
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FAR const struct sockaddr_in6 *inaddr;
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FAR struct net_driver_s *dev;
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FAR struct icmpv6_conn_s *conn;
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FAR struct icmpv6_echo_request_s *icmpv6;
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struct icmpv6_sendto_s state;
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ssize_t ret;
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/* Validity check, only single iov supported */
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if (msg->msg_iovlen != 1)
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{
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return -ENOTSUP;
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}
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if (to == NULL)
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{
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/* icmpv6_send() */
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/* ICMPv6 sockets cannot be bound and, hence, cannot support any
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* connection-oriented data transfer.
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*/
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return -EDESTADDRREQ;
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}
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/* Some sanity checks */
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DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
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buf != NULL && to != NULL);
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if (len < ICMPv6_HDRLEN || tolen < sizeof(struct sockaddr_in6))
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{
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return -EINVAL;
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}
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conn = psock->s_conn;
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inaddr = (FAR const struct sockaddr_in6 *)to;
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/* Get the device that will be used to route this ICMPv6 ECHO request */
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dev = netdev_findby_ripv6addr(g_ipv6_unspecaddr,
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inaddr->sin6_addr.s6_addr16);
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if (dev == NULL)
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{
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nerr("ERROR: Not reachable\n");
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ret = -ENETUNREACH;
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goto errout;
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}
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/* Sanity check if the request len is greater than the net payload len */
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if (len > NETDEV_PKTSIZE(dev) - (NET_LL_HDRLEN(dev) + IPv6_HDRLEN))
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{
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nerr("ERROR: Invalid packet length\n");
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return -EINVAL;
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}
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/* If we are no longer processing the same ping ID, then flush any pending
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* packets from the read-ahead buffer.
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*
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* REVISIT: How to we free up any lingering responses if there are no
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* further pings?
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*/
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icmpv6 = (FAR struct icmpv6_echo_request_s *)buf;
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if (icmpv6->type != ICMPv6_ECHO_REQUEST || icmpv6->id != conn->id ||
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dev != conn->dev)
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{
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conn->id = 0;
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conn->nreqs = 0;
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conn->dev = NULL;
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iob_free_queue(&conn->readahead, IOBUSER_NET_SOCK_ICMPv6);
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}
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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/* Make sure that the IP address mapping is in the Neighbor Table */
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ret = icmpv6_neighbor(inaddr->sin6_addr.s6_addr16);
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if (ret < 0)
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{
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nerr("ERROR: Not reachable\n");
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ret = -ENETUNREACH;
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goto errout;
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}
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#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
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/* Initialize the state structure */
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&state.snd_sem, 0, 0);
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nxsem_set_protocol(&state.snd_sem, SEM_PRIO_NONE);
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state.snd_result = -ENOMEM; /* Assume allocation failure */
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state.snd_buf = buf; /* ICMPv6 header + data payload */
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state.snd_buflen = len; /* Size of the ICMPv6 header+data payload */
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net_ipv6addr_copy(state.snd_toaddr.s6_addr16,
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inaddr->sin6_addr.s6_addr16);
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net_lock();
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/* Set up the callback */
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state.snd_cb = icmpv6_callback_alloc(dev, conn);
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if (state.snd_cb)
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{
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state.snd_cb->flags = (ICMPv6_POLL | NETDEV_DOWN);
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state.snd_cb->priv = (FAR void *)&state;
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state.snd_cb->event = sendto_eventhandler;
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/* Setup to receive ICMPv6 ECHO replies */
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if (icmpv6->type == ICMPv6_ECHO_REQUEST)
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{
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conn->id = icmpv6->id;
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conn->nreqs = 1;
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}
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conn->dev = dev;
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/* Notify the device driver of the availability of TX data */
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netdev_txnotify_dev(dev);
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/* Wait for either the send to complete or for timeout to occur.
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* net_timedwait will also terminate if a signal is received.
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*/
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ret = net_timedwait(&state.snd_sem, _SO_TIMEOUT(psock->s_sndtimeo));
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if (ret < 0)
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{
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if (ret == -ETIMEDOUT)
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{
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/* Check if this device is on the same network as the
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* destination device.
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*/
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if (!net_ipv6addr_maskcmp(state.snd_toaddr.s6_addr16,
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dev->d_ipv6addr, dev->d_ipv6netmask))
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{
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/* Destination address was not on the local network served
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* by this device. If a timeout occurs, then the most
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* likely reason is that the destination address is not
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* reachable.
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*/
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ret = -ENETUNREACH;
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}
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}
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state.snd_result = ret;
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}
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icmpv6_callback_free(dev, conn, state.snd_cb);
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}
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net_unlock();
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/* Return the negated error number in the event of a failure, or the
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* number of bytes sent on success.
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*/
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if (state.snd_result < 0)
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{
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nerr("ERROR: Return error=%d\n", state.snd_result);
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ret = state.snd_result;
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goto errout;
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}
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return len;
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errout:
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conn->id = 0;
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conn->nreqs = 0;
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conn->dev = NULL;
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iob_free_queue(&conn->readahead, IOBUSER_NET_SOCK_ICMPv6);
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return ret;
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}
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#endif /* CONFIG_NET_ICMPv6_SOCKET */
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