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- /****************************************************************************
- * net/icmpv6/icmpv6_input.c
- * Handling incoming ICMPv6 input
- *
- * Copyright (C) 2015, 2017-2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Adapted for NuttX from logic in uIP which also has a BSD-like license:
- *
- * Original author Adam Dunkels <adam@dunkels.com>
- * Copyright () 2001-2003, Adam Dunkels.
- * All rights reserved.
- *
- * 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. The name of the author may not be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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>
- #include <stdint.h>
- #include <string.h>
- #include <debug.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/netstats.h>
- #include <nuttx/net/icmpv6.h>
- #include "devif/devif.h"
- #include "neighbor/neighbor.h"
- #include "utils/utils.h"
- #include "icmpv6/icmpv6.h"
- #include "mld/mld.h"
- #ifdef CONFIG_NET_ICMPv6
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
- #define ICMPv6BUF ((FAR struct icmpv6_hdr_s *) \
- (&dev->d_buf[NET_LL_HDRLEN(dev)] + iplen))
- #define ICMPv6REPLY ((FAR struct icmpv6_echo_reply_s *)icmpv6)
- #define ICMPv6SIZE ((dev)->d_len - iplen)
- #define ICMPv6SOLICIT ((struct icmpv6_neighbor_solicit_s *)icmpv6)
- #define ICMPv6ADVERTISE ((struct icmpv6_neighbor_advertise_s *)icmpv6)
- #define ICMPv6RADVERTISE ((struct icmpv6_router_advertise_s *)icmpv6)
- #define MLDQUERY ((FAR struct mld_mcast_listen_query_s *)icmpv6)
- #define MLDREPORT_V1 ((FAR struct mld_mcast_listen_report_v1_s *)icmpv6)
- #define MLDREPORT_V2 ((FAR struct mld_mcast_listen_report_v2_s *)icmpv6)
- #define MLDDONE ((FAR struct mld_mcast_listen_done_s *)icmpv6)
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_datahandler
- *
- * Description:
- * Handle ICMPv6 echo replies that are not accepted by the application.
- *
- * Input Parameters:
- * dev - Device instance only the input packet in d_buf, length = d_len;
- * conn - A pointer to the ICMPv6 connection structure
- * buffer - A pointer to the buffer to be copied to the read-ahead
- * buffers
- * buflen - The number of bytes to copy to the read-ahead buffer.
- *
- * Returned Value:
- * The number of bytes actually buffered is returned. This will be either
- * zero or equal to buflen; partial packets are not buffered.
- *
- ****************************************************************************/
- #ifdef CONFIG_NET_ICMPv6_SOCKET
- static uint16_t icmpv6_datahandler(FAR struct net_driver_s *dev,
- FAR struct icmpv6_conn_s *conn,
- unsigned int iplen)
- {
- FAR struct ipv6_hdr_s *ipv6;
- FAR struct icmpv6_hdr_s *icmpv6;
- FAR struct iob_s *iob;
- struct sockaddr_in6 inaddr;
- uint16_t offset;
- uint16_t buflen;
- uint8_t addrsize;
- int ret;
- /* Try to allocate on I/O buffer to start the chain without waiting (and
- * throttling as necessary). If we would have to wait, then drop the
- * packet.
- */
- iob = iob_tryalloc(true);
- if (iob == NULL)
- {
- nerr("ERROR: Failed to create new I/O buffer chain\n");
- goto drop;
- }
- /* Put the IPv6 address at the beginning of the read-ahead buffer */
- ipv6 = IPv6BUF;
- inaddr.sin6_family = AF_INET6;
- inaddr.sin6_port = 0;
- net_ipv6addr_copy(inaddr.sin6_addr.s6_addr16, ipv6->srcipaddr);
- /* Copy the src address info into the I/O buffer chain. We will not wait
- * for an I/O buffer to become available in this context. It there is
- * any failure to allocated, the entire I/O buffer chain will be discarded.
- */
- addrsize = sizeof(struct sockaddr_in6);
- ret = iob_trycopyin(iob, &addrsize, sizeof(uint8_t), 0, true);
- if (ret < 0)
- {
- /* On a failure, iob_trycopyin return a negated error value but does
- * not free any I/O buffers.
- */
- nerr("ERROR: Failed to length to the I/O buffer chain: %d\n", ret);
- goto drop_with_chain;
- }
- offset = sizeof(uint8_t);
- ret = iob_trycopyin(iob, (FAR const uint8_t *)&inaddr,
- sizeof(struct sockaddr_in6), offset, true);
- if (ret < 0)
- {
- /* On a failure, iob_trycopyin return a negated error value but does
- * not free any I/O buffers.
- */
- nerr("ERROR: Failed to source address to the I/O buffer chain: %d\n", ret);
- goto drop_with_chain;
- }
- offset += sizeof(struct sockaddr_in6);
- /* Copy the new ICMPv6 reply into the I/O buffer chain (without waiting) */
- buflen = ICMPv6SIZE;
- icmpv6 = ICMPv6BUF;
- ret = iob_trycopyin(iob, (FAR uint8_t *)ICMPv6REPLY, buflen, offset, true);
- if (ret < 0)
- {
- /* On a failure, iob_copyin return a negated error value but does
- * not free any I/O buffers.
- */
- nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
- goto drop_with_chain;
- }
- /* Add the new I/O buffer chain to the tail of the read-ahead queue (again
- * without waiting).
- */
- ret = iob_tryadd_queue(iob, &conn->readahead);
- if (ret < 0)
- {
- nerr("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
- goto drop_with_chain;
- }
- ninfo("Buffered %d bytes\n", buflen + addrsize + 1);
- dev->d_len = 0;
- return buflen;
- drop_with_chain:
- (void)iob_free_chain(iob);
- drop:
- dev->d_len = 0;
- return 0;
- }
- #endif
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_input
- *
- * Description:
- * Handle incoming ICMPv6 input
- *
- * Input Parameters:
- * dev - The device driver structure containing the received ICMPv6
- * packet
- * iplen - The size of the IPv6 header. This may be larger than
- * IPv6_HDRLEN the IPv6 header if IPv6 extension headers are
- * present.
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- void icmpv6_input(FAR struct net_driver_s *dev, unsigned int iplen)
- {
- FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
- FAR struct icmpv6_hdr_s *icmpv6 = ICMPv6BUF;
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.icmpv6.recv++;
- #endif
- /* REVISIT:
- * - Verify that the message length is valid.
- * - Verify the ICMPv6 checksum
- */
- /* Handle the ICMPv6 message by its type */
- switch (icmpv6->type)
- {
- /* If we get a neighbor solicitation for our address we should send
- * a neighbor advertisement message back.
- */
- case ICMPv6_NEIGHBOR_SOLICIT:
- {
- FAR struct icmpv6_neighbor_solicit_s *sol;
- /* Check if we are the target of the solicitation */
- sol = ICMPv6SOLICIT;
- if (net_ipv6addr_cmp(sol->tgtaddr, dev->d_ipv6addr))
- {
- if (sol->opttype == ICMPv6_OPT_SRCLLADDR)
- {
- /* Save the sender's address mapping in our Neighbor Table. */
- neighbor_add(dev, ipv6->srcipaddr, sol->srclladdr);
- }
- /* Yes.. Send a neighbor advertisement back to where the neighbor
- * solicitation came from.
- */
- icmpv6_advertise(dev, ipv6->srcipaddr);
- /* All statistics have been updated. Nothing to do but exit. */
- return;
- }
- else
- {
- goto icmpv6_drop_packet;
- }
- }
- break;
- /* Check if we received a Neighbor Advertisement */
- case ICMPv6_NEIGHBOR_ADVERTISE:
- {
- FAR struct icmpv6_neighbor_advertise_s *adv;
- /* If the IPv6 destination address matches our address, and if so,
- * add the neighbor address mapping to the list of neighbors.
- *
- * Missing checks:
- * optlen = 1 (8 octets)
- * Should only update Neighbor Table if [O]verride bit is set in flags
- */
- adv = ICMPv6ADVERTISE;
- if (net_ipv6addr_cmp(ipv6->destipaddr, dev->d_ipv6addr))
- {
- /* This message is required to support the Target link-layer
- * address option.
- */
- if (adv->opttype == ICMPv6_OPT_TGTLLADDR)
- {
- /* Save the sender's address mapping in our Neighbor Table. */
- neighbor_add(dev, ipv6->srcipaddr, adv->tgtlladdr);
- }
- #ifdef CONFIG_NET_ICMPv6_NEIGHBOR
- /* Then notify any logic waiting for the Neighbor Advertisement */
- icmpv6_notify(ipv6->srcipaddr);
- #endif
- /* We consumed the packet but we don't send anything in
- * response.
- */
- goto icmpv6_send_nothing;
- }
- goto icmpv6_drop_packet;
- }
- break;
- #ifdef CONFIG_NET_ICMPv6_ROUTER
- /* Check if we received a Router Solicitation */
- case ICMPV6_ROUTER_SOLICIT:
- {
- /* Just give a knee-jerk Router Advertisement in respond with no
- * further examination of the Router Solicitation.
- */
- icmpv6_radvertise(dev);
- /* All statistics have been updated. Nothing to do but exit. */
- return;
- }
- #endif
- #ifdef CONFIG_NET_ICMPv6_AUTOCONF
- /* Check if we received a Router Advertisement */
- case ICMPV6_ROUTER_ADVERTISE:
- {
- FAR struct icmpv6_router_advertise_s *adv;
- FAR uint8_t *options;
- bool prefix = false;
- uint16_t pktlen;
- uint16_t optlen;
- int ndx;
- /* Get the length of the option data */
- pktlen = (uint16_t)ipv6->len[0] << 8 | ipv6->len[1];
- if (pktlen <= ICMPv6_RADV_MINLEN)
- {
- /* Too small to contain any options */
- goto icmpv6_drop_packet;
- }
- optlen = ICMPv6_RADV_OPTLEN(pktlen);
- /* We need to have a valid router advertisement with a Prefix and
- * with the "A" bit set in the flags. Options immediately follow
- * the ICMPv6 router advertisement.
- */
- adv = ICMPv6RADVERTISE;
- options = (FAR uint8_t *)adv + sizeof(struct icmpv6_router_advertise_s);
- for (ndx = 0; ndx + sizeof(struct icmpv6_prefixinfo_s) <= optlen; )
- {
- FAR struct icmpv6_srclladdr_s *sllopt =
- (FAR struct icmpv6_srclladdr_s *)&options[ndx];
- if (sllopt->opttype == ICMPv6_OPT_SRCLLADDR)
- {
- neighbor_add(dev, ipv6->srcipaddr, sllopt->srclladdr);
- }
- FAR struct icmpv6_prefixinfo_s *opt =
- (FAR struct icmpv6_prefixinfo_s *)&options[ndx];
- /* Is this the sought for prefix? Is it the correct size? Is
- * the "A" flag set?
- */
- if (opt->opttype == ICMPv6_OPT_PREFIX &&
- (opt->flags & ICMPv6_PRFX_FLAG_A) != 0)
- {
- /* Yes.. Notify any waiting threads */
- icmpv6_rnotify(dev, ipv6->srcipaddr, opt->prefix, opt->preflen);
- prefix = true;
- }
- /* Skip to the next option (units of octets) */
- ndx += (opt->optlen << 3);
- }
- if (prefix)
- {
- goto icmpv6_send_nothing;
- }
- goto icmpv6_drop_packet;
- }
- break;
- #endif
- /* Handle the ICMPv6 Echo Request */
- case ICMPv6_ECHO_REQUEST:
- {
- /* ICMPv6 echo (i.e., ping) processing. This is simple, we only
- * change the ICMPv6 type from ECHO to ECHO_REPLY and update the
- * ICMPv6 checksum before we return the packet.
- */
- icmpv6->type = ICMPv6_ECHO_REPLY;
- net_ipv6addr_copy(ipv6->destipaddr, ipv6->srcipaddr);
- net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
- icmpv6->chksum = 0;
- icmpv6->chksum = ~icmpv6_chksum(dev, iplen);
- }
- break;
- #ifdef CONFIG_NET_ICMPv6_SOCKET
- /* If an ICMPv6 echo reply is received then there should also be
- * a thread waiting to received the echo response.
- */
- case ICMPv6_ECHO_REPLY:
- {
- uint16_t flags = ICMPv6_ECHOREPLY;
- /* Dispatch the ECHO reply to the waiting thread */
- flags = devif_conn_event(dev, NULL, flags, dev->d_conncb);
- /* Was the ECHO reply consumed by any waiting thread? */
- if ((flags & ICMPv6_ECHOREPLY) != 0)
- {
- FAR struct icmpv6_echo_reply_s *reply;
- FAR struct icmpv6_conn_s *conn;
- uint16_t nbuffered;
- /* Nothing consumed the ICMP reply. That might because this is
- * an old, invalid reply or simply because the ping application
- * has not yet put its poll or recv in place.
- */
- /* Is there any connection that might expect this reply? */
- reply = ICMPv6REPLY;
- conn = icmpv6_findconn(dev, reply->id);
- if (conn == NULL)
- {
- /* No.. drop the packet */
- goto icmpv6_drop_packet;
- }
- /* Yes.. Add the ICMP echo reply to the IPPROTO_ICMP socket read
- * ahead buffer.
- */
- nbuffered = icmpv6_datahandler(dev, conn, iplen);
- if (nbuffered == 0)
- {
- /* Could not buffer the data.. drop the packet */
- goto icmpv6_drop_packet;
- }
- }
- goto icmpv6_send_nothing;
- }
- break;
- #endif
- #ifdef CONFIG_NET_MLD
- /* Dispatch received Multicast Listener Discovery (MLD) packets. */
- case ICMPV6_MCAST_LISTEN_QUERY: /* Multicast Listener Query, RFC 2710 and RFC 3810 */
- {
- FAR struct mld_mcast_listen_query_s *query = MLDQUERY;
- int ret;
- ret = mld_query(dev, query);
- if (ret < 0)
- {
- goto icmpv6_drop_packet;
- }
- }
- break;
- case ICMPV6_MCAST_LISTEN_REPORT_V1: /* Version 1 Multicast Listener Report, RFC 2710 */
- {
- FAR struct mld_mcast_listen_report_v1_s *report = MLDREPORT_V1;
- int ret;
- ret = mld_report_v1(dev, report);
- if (ret < 0)
- {
- goto icmpv6_drop_packet;
- }
- }
- break;
- case ICMPV6_MCAST_LISTEN_REPORT_V2: /* Version 2 Multicast Listener Report, RFC 3810 */
- {
- FAR struct mld_mcast_listen_report_v2_s *report = MLDREPORT_V2;
- int ret;
- ret = mld_report_v2(dev, report);
- if (ret < 0)
- {
- goto icmpv6_drop_packet;
- }
- }
- break;
- case ICMPV6_MCAST_LISTEN_DONE: /* Multicast Listener Done, RFC 2710 */
- {
- FAR struct mld_mcast_listen_done_s *done = MLDDONE;
- int ret;
- ret = mld_done(dev, done);
- if (ret < 0)
- {
- goto icmpv6_drop_packet;
- }
- }
- break;
- #endif
- default:
- {
- nwarn("WARNING: Unknown ICMPv6 type: %d\n", icmpv6->type);
- goto icmpv6_type_error;
- }
- }
- #ifdef CONFIG_NET_STATISTICS
- if (dev->d_len > 0)
- {
- ninfo("Outgoing ICMPv6 packet length: %d (%d)\n",
- dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
- g_netstats.icmpv6.sent++;
- g_netstats.ipv6.sent++;
- }
- #endif
- return;
- icmpv6_type_error:
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.icmpv6.typeerr++;
- #endif
- icmpv6_drop_packet:
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.icmpv6.drop++;
- #endif
- icmpv6_send_nothing:
- dev->d_len = 0;
- }
- #endif /* CONFIG_NET_ICMPv6 */
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