/**************************************************************************** * net/icmp/icmp_sendto.c * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "utils/utils.h" #include "socket/socket.h" #include "netdev/netdev.h" #include "devif/devif.h" #include "inet/inet.h" #include "arp/arp.h" #include "icmp/icmp.h" #ifdef CONFIG_NET_ICMP_SOCKET /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define IPv4BUF \ ((struct ipv4_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)]) #define ICMPBUF \ ((struct icmp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN]) /**************************************************************************** * Private Types ****************************************************************************/ struct icmp_sendto_s { FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */ sem_t snd_sem; /* Use to manage the wait for send * complete */ in_addr_t snd_toaddr; /* The peer to send the request to */ FAR const uint8_t *snd_buf; /* ICMP header + data payload */ uint16_t snd_buflen; /* Size of the ICMP header + data * payload */ int16_t snd_result; /* 0: success; <0:negated errno on * fail */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: sendto_request * * Description: * Setup to send an ICMP request packet * * Input Parameters: * dev - The device driver structure to use in the send operation * pstate - Reference to an instance of the ICMP sendto state structure * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ static void sendto_request(FAR struct net_driver_s *dev, FAR struct icmp_sendto_s *pstate) { FAR struct ipv4_hdr_s *ipv4; FAR struct icmp_hdr_s *icmp; IFF_SET_IPv4(dev->d_flags); /* The total length to send is the size of the application data plus the * IP and ICMP headers (and, eventually, the Ethernet header) */ dev->d_len = IPv4_HDRLEN + pstate->snd_buflen; /* The total size of the data (including the size of the ICMP header) */ dev->d_sndlen += pstate->snd_buflen; /* Initialize the IP header. */ ipv4 = IPv4BUF; ipv4->vhl = 0x45; ipv4->tos = 0; ipv4->len[0] = (dev->d_len >> 8); ipv4->len[1] = (dev->d_len & 0xff); ++g_ipid; ipv4->ipid[0] = g_ipid >> 8; ipv4->ipid[1] = g_ipid & 0xff; ipv4->ipoffset[0] = IP_FLAG_DONTFRAG >> 8; ipv4->ipoffset[1] = IP_FLAG_DONTFRAG & 0xff; ipv4->ttl = IP_TTL; ipv4->proto = IP_PROTO_ICMP; net_ipv4addr_hdrcopy(ipv4->srcipaddr, &dev->d_ipaddr); net_ipv4addr_hdrcopy(ipv4->destipaddr, &pstate->snd_toaddr); /* Copy the ICMP header and payload into place after the IPv4 header */ icmp = ICMPBUF; memcpy(icmp, pstate->snd_buf, pstate->snd_buflen); /* Calculate IP checksum. */ ipv4->ipchksum = 0; ipv4->ipchksum = ~(ipv4_chksum(dev)); /* Calculate the ICMP checksum. */ icmp->icmpchksum = 0; icmp->icmpchksum = ~(icmp_chksum(dev, pstate->snd_buflen)); if (icmp->icmpchksum == 0) { icmp->icmpchksum = 0xffff; } ninfo("Outgoing ICMP packet length: %d (%d)\n", dev->d_len, (ipv4->len[0] << 8) | ipv4->len[1]); #ifdef CONFIG_NET_STATISTICS g_netstats.icmp.sent++; g_netstats.ipv4.sent++; #endif } /**************************************************************************** * Name: sendto_eventhandler * * Description: * This function is called with the network locked to perform the actual * ECHO request and/or ECHO reply actions when polled by the lower, device * interfacing layer. * * Input Parameters: * dev The structure of the network driver that generated the * event. * conn The received packet, cast to (void *) * pvpriv An instance of struct icmp_sendto_s cast to (void *) * flags Set of events describing why the callback was invoked * * Returned Value: * Modified value of the input flags * * Assumptions: * The network is locked. * ****************************************************************************/ static uint16_t sendto_eventhandler(FAR struct net_driver_s *dev, FAR void *conn, FAR void *pvpriv, uint16_t flags) { FAR struct icmp_sendto_s *pstate = (struct icmp_sendto_s *)pvpriv; ninfo("flags: %04x\n", flags); if (pstate != NULL) { /* Check if the network is still up */ if ((flags & NETDEV_DOWN) != 0) { nerr("ERROR: Interface is down\n"); pstate->snd_result = -ENETUNREACH; goto end_wait; } /* Check: * If the outgoing packet is available (it may have been claimed * by a sendto event handler 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 & ICMP_NEWDATA) == 0) /* No incoming data */ { /* Send the ICMP echo request. */ ninfo("Send ICMP request\n"); sendto_request(dev, pstate); pstate->snd_result = OK; goto end_wait; } /* Continue waiting */ } return flags; end_wait: ninfo("Resuming\n"); /* Do not allow any further callbacks */ pstate->snd_cb->flags = 0; pstate->snd_cb->priv = NULL; pstate->snd_cb->event = NULL; /* Wake up the waiting thread */ nxsem_post(&pstate->snd_sem); return flags; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: icmp_sendto * * Description: * Implements the sendto() operation for the case of the IPPROTO_ICMP * socket. The 'buf' parameter points to a block of memory that includes * an ICMP request header, followed by any payload that accompanies the * request. The 'len' parameter includes both the size of the ICMP header * and the following payload. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. On error, a negated * errno value is returned (see send_to() for the list of appropriate error * values. * ****************************************************************************/ ssize_t icmp_sendto(FAR struct socket *psock, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen) { FAR const struct sockaddr_in *inaddr; FAR struct net_driver_s *dev; FAR struct icmp_conn_s *conn; FAR struct icmp_hdr_s *icmp; struct icmp_sendto_s state; int ret; /* Some sanity checks */ DEBUGASSERT(psock != NULL && psock->s_conn != NULL && buf != NULL && to != NULL); if (len < ICMP_HDRLEN || tolen < sizeof(struct sockaddr_in)) { return -EINVAL; } conn = psock->s_conn; inaddr = (FAR const struct sockaddr_in *)to; /* Get the device that will be used to route this ICMP ECHO request */ dev = netdev_findby_ripv4addr(INADDR_ANY, inaddr->sin_addr.s_addr); if (dev == NULL) { nerr("ERROR: Not reachable\n"); ret = -ENETUNREACH; goto errout; } /* If we are no longer processing the same ping ID, then flush any pending * packets from the read-ahead buffer. * * REVISIT: How to we free up any lingering responses if there are no * further pings? */ icmp = (FAR struct icmp_hdr_s *)buf; if (icmp->type != ICMP_ECHO_REQUEST || icmp->id != conn->id || dev != conn->dev) { conn->id = 0; conn->nreqs = 0; conn->dev = NULL; iob_free_queue(&conn->readahead, IOBUSER_NET_SOCK_ICMP); } #ifdef CONFIG_NET_ARP_SEND /* Make sure that the IP address mapping is in the ARP table */ ret = arp_send(inaddr->sin_addr.s_addr); if (ret < 0) { nerr("ERROR: Not reachable\n"); ret = -ENETUNREACH; goto errout; } #endif /* Initialize the state structure */ /* This semaphore is used for signaling and, hence, should not have * priority inheritance enabled. */ nxsem_init(&state.snd_sem, 0, 0); nxsem_set_protocol(&state.snd_sem, SEM_PRIO_NONE); state.snd_result = -ENOMEM; /* Assume allocation failure */ state.snd_toaddr = inaddr->sin_addr.s_addr; /* Address of the peer to send * the request */ state.snd_buf = buf; /* ICMP header + data payload */ state.snd_buflen = len; /* Size of the ICMP header + * data payload */ net_lock(); /* Set up the callback */ state.snd_cb = icmp_callback_alloc(dev, conn); if (state.snd_cb != NULL) { state.snd_cb->flags = (ICMP_POLL | NETDEV_DOWN); state.snd_cb->priv = (FAR void *)&state; state.snd_cb->event = sendto_eventhandler; /* Setup to receive ICMP ECHO replies */ if (icmp->type == ICMP_ECHO_REQUEST) { conn->id = icmp->id; conn->nreqs = 1; } conn->dev = dev; /* Notify the device driver of the availability of TX data */ netdev_txnotify_dev(dev); /* Wait for either the send to complete or for timeout to occur. * net_timedwait will also terminate if a signal is received. */ ret = net_timedwait(&state.snd_sem, _SO_TIMEOUT(psock->s_sndtimeo)); if (ret < 0) { if (ret == -ETIMEDOUT) { /* Check if this device is on the same network as the * destination device. */ if (!net_ipv4addr_maskcmp(state.snd_toaddr, dev->d_ipaddr, dev->d_netmask)) { /* 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. */ ret = -ENETUNREACH; } } state.snd_result = ret; } icmp_callback_free(dev, conn, state.snd_cb); } net_unlock(); /* Return the negated error number in the event of a failure, or the * number of bytes sent on success. */ if (state.snd_result < 0) { nerr("ERROR: Return error=%d\n", state.snd_result); ret = state.snd_result; goto errout; } return len; errout: conn->id = 0; conn->nreqs = 0; conn->dev = NULL; iob_free_queue(&conn->readahead, IOBUSER_NET_SOCK_ICMP); return ret; } #endif /* CONFIG_NET_ICMP_SOCKET */