309 lines
8.6 KiB
C
309 lines
8.6 KiB
C
/****************************************************************************
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* netutils/ping/icmp_ping.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sys/socket.h>
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#include <signal.h>
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#include <time.h>
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#include <arpa/inet.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ICMPv6BUF ((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6ECHOREQ \
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((struct icmpv6_echo_request_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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#define ICMPv6ECHOREPLY \
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((struct icmpv6_echo_reply_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/* Use the monotonic clock if it is available */
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#ifdef CONFIG_CLOCK_MONOTONIC
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# define PING_CLOCK CLOCK_MONOTONIC
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#else
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# define PING_CLOCK CLOCK_REALTIME
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#endif
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#ifndef CONFIG_NETUTILS_PING_SIGNO
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# define CONFIG_NETUTILS_PING_SIGNO 13
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#endif
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#define ICMPv6_DATALEN 56
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#define IPv6_PAYLOAD_SIZE (ICMPv6_HDRLEN + ICMPv6_DATALEN)
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#define PING6_BUFFER_SIZE (IPv6_HDRLEN + IPv6_PAYLOAD_SIZE)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_echo_request
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*
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* Description:
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* Format an ICMPv6 Echo Request message.
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*
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* Parameters:
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*
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*
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* Return:
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* None
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*
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****************************************************************************/
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static void icmpv6_echo_request(FAR struct net_driver_s *dev,
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FAR struct icmpv6_ping_s *pstate)
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{
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FAR struct icmpv6_iphdr_s *icmp;
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FAR struct icmpv6_echo_request_s *req;
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uint16_t reqlen;
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int i;
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ninfo("Send ECHO request: seqno=%d\n", pstate->png_seqno);
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/* Set up the IPv6 header (most is probably already in place) */
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icmp = ICMPv6BUF;
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icmp->vtc = 0x60; /* Version/traffic class (MS) */
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icmp->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
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icmp->flow = 0; /* Flow label (LS) */
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/* Length excludes the IPv6 header */
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reqlen = SIZEOF_ICMPV6_ECHO_REQUEST_S(pstate->png_datlen);
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icmp->len[0] = (reqlen >> 8);
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icmp->len[1] = (reqlen & 0xff);
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icmp->proto = IP_PROTO_ICMP6; /* Next header */
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icmp->ttl = IP_TTL; /* Hop limit */
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/* Set the multicast destination IP address */
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net_ipv6addr_copy(icmp->destipaddr, pstate->png_addr);
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/* Add out IPv6 address as the source address */
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net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
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/* Set up the ICMPv6 Echo Request message */
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req = ICMPv6ECHOREQ;
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req->type = ICMPv6_ECHO_REQUEST; /* Message type */
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req->code = 0; /* Message qualifier */
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req->id = htons(pstate->png_id);
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req->seqno = htons(pstate->png_seqno);
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/* Add some easily verifiable data */
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for (i = 0; i < pstate->png_datlen; i++)
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{
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req->data[i] = i;
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}
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/* Calculate the checksum over both the ICMP header and payload */
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icmp->chksum = 0;
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icmp->chksum = ~icmpv6_chksum(dev);
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/* Set the size to the size of the IPv6 header and the payload size */
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IFF_SET_IPv6(dev->d_flags);
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dev->d_sndlen = reqlen;
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dev->d_len = reqlen + IPv6_HDRLEN;
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}
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static void ping6_timeout(int signo, FAR siginfo_t *info, FAR void *arg)
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{
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FAR bool *timeout = (FAR bool *)arg;
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*timeout = true;
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}
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int ipv6_ping(FAR struct sockaddr_in6 *raddr,
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FAR const struct timespec *timeout,
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FAR struct timespec *roundtrip)
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{
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FAR struct icmp6_hdr *icmpv6;
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struct sigevent notify;
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struct sigaction act;
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struct sigaction oact;
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struct itimerspec value;
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struct itimerspec ovalue;
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char buffer[PING6_BUFFER_SIZE];
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timer_t timerid;
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ssize_t nrecvd;
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bool timeout;
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int errcode;
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int ret;
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int sd;
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DEBUGASSERT(raddr != NULL);
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/* Allocate a POSIX timer */
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timeout = false;
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notify.sigev_notify = SIGEV_SIGNAL;
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notify.sigev_signo = CONFIG_NETUTILS_PING_SIGNO;
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notify.sigev_value.sival_ptr = (FAR void *)&timeout;
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ret = timer_create(PING_CLOCK, ¬ify, &timerid);
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if (ret < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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return -errcode;
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}
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/* Attach a signal handler */
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act.sa_sigaction = ping_timeout;
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act.sa_flags = SA_SIGINFO;
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(void)sigfillset(&act.sa_mask);
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(void)sigdelset(&act.sa_mask, CONFIG_NETUTILS_PING_SIGNO);
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ret = sigaction(CONFIG_NETUTILS_PING_SIGNO, &act, &oact);
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if (ret < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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ret = -errcode;
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goto errout_with_timer;
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}
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/* Create the raw socket */
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sd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
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if (sd < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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ret = -errcode;
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goto errout_with_sigaction;
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}
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/* Format and send the ECHO request */
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icmpv6_echo_request(FAR struct net_driver_s *dev,
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FAR struct icmpv6_ping_s *pstate);
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ret = sendto(sd, buffer, PING6_BUFFER_SIZE, &raddr,
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sizeof(struct sockaddr_in6));
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if (ret < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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ret = -errcode;
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goto errout_with_socket;
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}
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/* Start the timer */
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value.it_value.tv_sec = timeout->tv_sec;
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value.it_value.tv_nsec = timeout->tv_nsec;
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value.it_interval.tv_sec = 0;
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value.it_interval.tv_nsec = 0;
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ret = timer_settime(timerid, 0, &value, NULL);
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if (ret < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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ret = -errcode;
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goto errout_with_socket;
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}
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/* Wait for the echo reply */
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for (; ; )
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{
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nrecvd = recv(sd, buffer, PING6_BUFFER_SIZE, 0);
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if (nrecvd < 0)
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{
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if (errno != EINTR)
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{
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int errcode = errno;
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DEBUGASSERT(errno > 0);
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nerr("ERROR: recv failed: %d\n", errcode);
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ret = -errcode;
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break;
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}
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}
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else if (nrecvd >= PING6_BUFFER_SIZE &&
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icmpv6->icmp6_type == ICMPv6_ECHO_REPLY)
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{
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ret = OK;
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break;
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}
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}
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/* Stop the timer */
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value.it_value.tv_sec = 0;
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value.it_value.tv_nsec = 0;
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value.it_interval.tv_sec = 0;
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value.it_interval.tv_nsec = 0;
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(void)timer_settime(timerid, 0, &value, &ovalue);
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if (ret < 0)
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{
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errcode = errno;
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DEBUGASSERT(errno > 0);
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ret = -errcode;
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}
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else
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{
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rountrip->tv_sec = ovalue.it_value.tv_sec;
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rountrip->tv_nsec = ovalue.it_value.tv_nsec;
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ret = OK;
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}
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errout_with_socket:
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close(sd);
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errout_with_sigaction:
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(void) sigaction(CONFIG_NETUTILS_PING_SIGNO, &oact, NULL);
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errout_with_timer:
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timer_delete(timerid);
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return ret;
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}
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