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nuttx/net/icmpv6/icmpv6_ping.c

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/****************************************************************************
* net/icmpv6/icmpv6_ping.c
*
* Copyright (C) 2015 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>
#ifdef CONFIG_NET_ICMPv6_PING
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <semaphore.h>
#include <debug.h>
#include <net/if.h>
#include <nuttx/clock.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/icmpv6.h>
#include <nuttx/net/netstats.h>
#include "netdev/netdev.h"
#include "devif/devif.h"
#include "utils/utils.h"
#include "icmpv6/icmpv6.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
#define ICMPv6BUF ((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
#define ICMPv6ECHOREQ \
((struct icmpv6_echo_request_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
#define ICMPv6ECHOREPLY \
((struct icmpv6_echo_reply_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct icmpv6_ping_s
{
FAR struct devif_callback_s *png_cb; /* Reference to callback instance */
sem_t png_sem; /* Use to manage the wait for the response */
uint32_t png_time; /* Start time for determining timeouts */
uint32_t png_ticks; /* System clock ticks to wait */
int png_result; /* 0: success; <0:negated errno on fail */
net_ipv6addr_t png_addr; /* The peer to be ping'ed */
uint16_t png_id; /* Used to match requests with replies */
uint16_t png_seqno; /* IN: seqno to send; OUT: seqno received */
uint16_t png_datlen; /* The length of data to send in the ECHO request */
bool png_sent; /* true... the PING request has been sent */
};
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: ping_timeout
*
* Description:
* Check for send timeout.
*
* Parameters:
* pstate - Ping state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static inline int ping_timeout(FAR struct icmpv6_ping_s *pstate)
{
uint32_t elapsed = clock_systimer() - pstate->png_time;
if (elapsed >= pstate->png_ticks)
{
return TRUE;
}
return FALSE;
}
/****************************************************************************
* Name: icmpv6_echo_request
*
* Description:
* Format an ICMPv6 Echo Request message.. This version
* is for a standalone solicitation. If formats:
*
* - The Ethernet header
* - The IPv6 header
* - The ICMPv6 Echo Request Message
*
* Parameters:
* dev - Reference to an Ethernet device driver structure
* pstate - Ping state structure
*
* Return:
* None
*
****************************************************************************/
static void icmpv6_echo_request(FAR struct net_driver_s *dev,
FAR struct icmpv6_ping_s *pstate)
{
FAR struct icmpv6_iphdr_s *icmp;
FAR struct icmpv6_echo_request_s *req;
uint16_t reqlen;
int i;
nllvdbg("Send ECHO request: seqno=%d\n", pstate->png_seqno);
/* Set up the IPv6 header (most is probably already in place) */
icmp = ICMPv6BUF;
icmp->vtc = 0x60; /* Version/traffic class (MS) */
icmp->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
icmp->flow = 0; /* Flow label (LS) */
/* Length excludes the IPv6 header */
reqlen = SIZEOF_ICMPV6_ECHO_REQUEST_S(pstate->png_datlen);
icmp->len[0] = (reqlen >> 8);
icmp->len[1] = (reqlen & 0xff);
icmp->proto = IP_PROTO_ICMP6; /* Next header */
icmp->ttl = IP_TTL; /* Hop limit */
/* Set the multicast destination IP address */
net_ipv6addr_copy(icmp->destipaddr, pstate->png_addr);
/* Add out IPv6 address as the source address */
net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Echo Request message */
req = ICMPv6ECHOREQ;
req->type = ICMPv6_ECHO_REQUEST; /* Message type */
req->code = 0; /* Message qualifier */
req->id = htons(pstate->png_id);
req->seqno = htons(pstate->png_seqno);
/* Add some easily verifiable data */
for (i = 0; i < pstate->png_datlen; i++)
{
req->data[i] = i;
}
/* Calculate the checksum over both the ICMP header and payload */
icmp->chksum = 0;
icmp->chksum = ~icmpv6_chksum(dev);
/* Set the size to the size of the IPv6 header and the payload size */
IFF_SET_IPv6(dev->d_flags);
dev->d_sndlen = reqlen;
dev->d_len = reqlen + IPv6_HDRLEN;
nllvdbg("Outgoing ICMPv6 Echo Request length: %d (%d)\n",
dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmpv6.sent++;
g_netstats.ipv6.sent++;
#endif
}
/****************************************************************************
* Function: ping_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* ECHO request and/or ECHO reply actions when polled by the lower, device
* interfacing layer.
*
* Parameters:
* dev The structure of the network driver that caused the interrupt
* conn The received packet, cast to void *
* pvpriv An instance of struct icmpv6_ping_s cast to void*
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* Modified value of the input flags
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint16_t ping_interrupt(FAR struct net_driver_s *dev, FAR void *conn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct icmpv6_ping_s *pstate = (struct icmpv6_ping_s *)pvpriv;
nllvdbg("flags: %04x\n", flags);
if (pstate)
{
/* Check if the network is still up */
if ((flags & NETDEV_DOWN) != 0)
{
nlldbg("ERROR: Interface is down\n");
pstate->png_result = -ENETUNREACH;
goto end_wait;
}
/* Check if this is a ICMPv6 ECHO reply. If so, return the sequence
* number to the caller. NOTE: We may not even have sent the
* requested ECHO request; this could have been the delayed ECHO
* response from a previous ping.
*/
else if ((flags & ICMPv6_ECHOREPLY) != 0 && conn != NULL)
{
FAR struct icmpv6_echo_reply_s *reply = ICMPv6ECHOREPLY;
nllvdbg("ECHO reply: id=%d seqno=%d\n",
ntohs(reply->id), ntohs(reply->seqno));
if (ntohs(reply->id) == pstate->png_id)
{
/* Consume the ECHOREPLY */
flags &= ~ICMPv6_ECHOREPLY;
dev->d_len = 0;
/* Return the result to the caller */
pstate->png_result = OK;
pstate->png_seqno = ntohs(reply->seqno);
goto end_wait;
}
}
/* Check:
* If the outgoing packet is available (it may have been claimed
* by a sendto interrupt serving a different thread)
* -OR-
* If the output buffer currently contains unprocessed incoming
* data.
* -OR-
* If we have already sent the ECHO request
*
* In the first two cases, we will just have to wait for the next
* polling cycle.
*/
if (dev->d_sndlen <= 0 && /* Packet available */
(flags & ICMPv6_NEWDATA) == 0 && /* No incoming data */
!pstate->png_sent) /* Request not sent */
{
/* Send the ECHO request now. */
icmpv6_echo_request(dev, pstate);
pstate->png_sent = true;
return flags;
}
/* Check if the selected timeout has elapsed */
if (ping_timeout(pstate))
{
int failcode;
/* Check if this device is on the same network as the destination
* device.
*/
if (!net_ipv6addr_maskcmp(pstate->png_addr, dev->d_ipv6addr,
dev->d_ipv6netmask))
{
/* Destination address was not on the local network served by
* this device. If a timeout occurs, then the most likely
* reason is that the destination address is not reachable.
*/
nlldbg("Not reachable\n");
failcode = -ENETUNREACH;
}
else
{
nlldbg("Ping timeout\n");
failcode = -ETIMEDOUT;
}
/* Report the failure */
pstate->png_result = failcode;
goto end_wait;
}
/* Continue waiting */
}
return flags;
end_wait:
nllvdbg("Resuming\n");
/* Do not allow any further callbacks */
pstate->png_cb->flags = 0;
pstate->png_cb->priv = NULL;
pstate->png_cb->event = NULL;
/* Wake up the waiting thread */
sem_post(&pstate->png_sem);
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: imcpv6_ping
*
* Description:
* Send a ECHO request and wait for the ECHO response
*
* Parameters:
* addr - The IP address of the peer to send the ICMPv6 ECHO request to
* in network order.
* id - The ID to use in the ICMPv6 ECHO request. This number should be
* unique; only ECHO responses with this matching ID will be
* processed (host order)
* seqno - The sequence number used in the ICMPv6 ECHO request. NOT used
* to match responses (host order)
* dsecs - Wait up to this many deci-seconds for the ECHO response to be
* returned (host order).
*
* Return:
* seqno of received ICMPv6 ECHO with matching ID (may be different
* from the seqno argument (may be a delayed response from an earlier
* ping with the same ID). Or a negated errno on any failure.
*
* Assumptions:
* Called from the user level with interrupts enabled.
*
****************************************************************************/
int icmpv6_ping(net_ipv6addr_t addr, uint16_t id, uint16_t seqno,
uint16_t datalen, int dsecs)
{
FAR struct net_driver_s *dev;
struct icmpv6_ping_s state;
net_lock_t save;
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
int ret;
/* Make sure that the IP address mapping is in the Neighbor Table */
ret = icmpv6_neighbor(addr);
if (ret < 0)
{
ndbg("ERROR: Not reachable\n");
return -ENETUNREACH;
}
#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
/* Get the device that will be used to route this ICMP ECHO request */
#ifdef CONFIG_NETDEV_MULTINIC
dev = netdev_findby_ipv6addr(g_ipv6_allzeroaddr, addr);
#else
dev = netdev_findby_ipv6addr(addr);
#endif
if (dev == 0)
{
ndbg("ERROR: Not reachable\n");
return -ENETUNREACH;
}
/* Initialize the state structure */
sem_init(&state.png_sem, 0, 0);
state.png_ticks = DSEC2TICK(dsecs); /* System ticks to wait */
state.png_result = -ENOMEM; /* Assume allocation failure */
state.png_id = id; /* The ID to use in the ECHO request */
state.png_seqno = seqno; /* The seqno to use in the ECHO request */
state.png_datlen = datalen; /* The length of data to send in the ECHO request */
state.png_sent = false; /* ECHO request not yet sent */
net_ipv6addr_copy(state.png_addr, addr); /* Address of the peer to be ping'ed */
save = net_lock();
state.png_time = clock_systimer();
/* Set up the callback */
state.png_cb = icmpv6_callback_alloc(dev);
if (state.png_cb)
{
state.png_cb->flags = (ICMPv6_POLL | ICMPv6_ECHOREPLY);
state.png_cb->priv = (void*)&state;
state.png_cb->event = ping_interrupt;
state.png_result = -EINTR; /* Assume sem-wait interrupted by signal */
/* Notify the device driver of the availability of TX data */
netdev_txnotify_dev(dev);
/* Wait for either the full round trip transfer to complete or
* for timeout to occur. (1) net_lockedwait will also terminate if a
* signal is received, (2) interrupts may be disabled! They will
* be re-enabled while the task sleeps and automatically
* re-enabled when the task restarts.
*/
nllvdbg("Start time: 0x%08x seqno: %d\n", state.png_time, seqno);
net_lockedwait(&state.png_sem);
icmpv6_callback_free(dev, state.png_cb);
}
net_unlock(save);
/* Return the negated error number in the event of a failure, or the
* sequence number of the ECHO reply on success.
*/
if (!state.png_result)
{
nllvdbg("Return seqno=%d\n", state.png_seqno);
return (int)state.png_seqno;
}
else
{
nlldbg("Return error=%d\n", -state.png_result);
return state.png_result;
}
}
#endif /* CONFIG_NET_ICMPv6_PING */
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