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317 lines
9.2 KiB
317 lines
9.2 KiB
/**************************************************************************** |
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* net/uip/uip_icmpinput.c |
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* Handling incoming ICMP/ICMP6 input |
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* |
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Adapted for NuttX from logic in uIP which also has a BSD-like license: |
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* |
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* Original author Adam Dunkels <adam@dunkels.com> |
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* Copyright () 2001-2003, Adam Dunkels. |
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* All rights reserved. |
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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 the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE 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 <nuttx/config.h> |
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#ifdef CONFIG_NET |
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#include <stdint.h> |
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#include <debug.h> |
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#include <net/if.h> |
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#include <nuttx/net/uip/uipopt.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/net/uip/uip-arch.h> |
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#include "uip_internal.h" |
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#ifdef CONFIG_NET_ICMP |
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/**************************************************************************** |
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* Pre-processor Definitions |
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****************************************************************************/ |
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#define ICMPBUF ((struct uip_icmpip_hdr *)&dev->d_buf[UIP_LLH_LEN]) |
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/**************************************************************************** |
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* Public Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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#ifdef CONFIG_NET_ICMP_PING |
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struct uip_callback_s *g_echocallback = NULL; |
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#endif |
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/**************************************************************************** |
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* Private Functions |
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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: uip_icmpinput |
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* |
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* Description: |
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* Handle incoming ICMP/ICMP6 input |
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* |
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* Parameters: |
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* dev - The device driver structure containing the received ICMP/ICMP6 |
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* packet |
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* |
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* Return: |
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* None |
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* |
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* Assumptions: |
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* Called from the interrupt level or with interrupts disabled. |
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* |
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****************************************************************************/ |
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void uip_icmpinput(struct uip_driver_s *dev) |
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{ |
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struct uip_icmpip_hdr *picmp = ICMPBUF; |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.recv++; |
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#endif |
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#ifndef CONFIG_NET_IPv6 |
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/* ICMPv4 processing code follows. */ |
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/* ICMP echo (i.e., ping) processing. This is simple, we only change the |
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* ICMP type from ECHO to ECHO_REPLY and adjust the ICMP checksum before |
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* we return the packet. |
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*/ |
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if (picmp->type == ICMP_ECHO_REQUEST) |
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{ |
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/* If we are configured to use ping IP address assignment, we use |
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* the destination IP address of this ping packet and assign it to |
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* ourself. |
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*/ |
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#ifdef CONFIG_NET_PINGADDRCONF |
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if (dev->d_ipaddr == 0) |
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{ |
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dev->d_ipaddr = picmp->destipaddr; |
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} |
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#endif |
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/* Change the ICMP type */ |
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picmp->type = ICMP_ECHO_REPLY; |
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/* Swap IP addresses. */ |
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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr); |
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr); |
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/* Recalculate the ICMP checksum */ |
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#if 0 |
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/* The slow way... sum over the ICMP message */ |
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picmp->icmpchksum = 0; |
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picmp->icmpchksum = ~uip_icmpchksum(dev, (((uint16_t)picmp->len[0] << 8) | (uint16_t)picmp->len[1]) - UIP_IPH_LEN); |
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if (picmp->icmpchksum == 0) |
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{ |
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picmp->icmpchksum = 0xffff; |
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} |
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#else |
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/* The quick way -- Since only the type has changed, just adjust the |
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* checksum for the change of type |
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*/ |
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if( picmp->icmpchksum >= HTONS(0xffff - (ICMP_ECHO_REQUEST << 8))) |
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{ |
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picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8) + 1; |
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} |
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else |
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{ |
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picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8); |
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} |
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#endif |
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nllvdbg("Outgoing ICMP packet length: %d (%d)\n", |
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dev->d_len, (picmp->len[0] << 8) | picmp->len[1]); |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.sent++; |
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uip_stat.ip.sent++; |
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#endif |
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} |
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/* If an ICMP echo reply is received then there should also be |
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* a thread waiting to received the echo response. |
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*/ |
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#ifdef CONFIG_NET_ICMP_PING |
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else if (picmp->type == ICMP_ECHO_REPLY && g_echocallback) |
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{ |
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(void)uip_callbackexecute(dev, picmp, UIP_ECHOREPLY, g_echocallback); |
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} |
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#endif |
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/* Otherwise the ICMP input was not processed */ |
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else |
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{ |
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nlldbg("Unknown ICMP cmd: %d\n", picmp->type); |
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goto typeerr; |
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} |
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return; |
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typeerr: |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.typeerr++; |
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uip_stat.icmp.drop++; |
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#endif |
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dev->d_len = 0; |
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#else /* !CONFIG_NET_IPv6 */ |
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/* If we get a neighbor solicitation for our address we should send |
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* a neighbor advertisement message back. |
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*/ |
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if (picmp->type == ICMP6_NEIGHBOR_SOLICITATION) |
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{ |
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if (uip_ipaddr_cmp(picmp->icmp6data, dev->d_ipaddr)) |
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{ |
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if (picmp->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) |
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{ |
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/* Save the sender's address in our neighbor list. */ |
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uiphdr_neighbor_add(picmp->srcipaddr, &(picmp->options[2])); |
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} |
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/* We should now send a neighbor advertisement back to where the |
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* neighbor solicication came from. |
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*/ |
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picmp->type = ICMP6_NEIGHBOR_ADVERTISEMENT; |
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picmp->flags = ICMP6_FLAG_S; /* Solicited flag. */ |
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picmp->reserved1 = picmp->reserved2 = picmp->reserved3 = 0; |
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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr); |
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr); |
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picmp->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS; |
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picmp->options[1] = 1; /* Options length, 1 = 8 bytes. */ |
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memcpy(&(picmp->options[2]), &dev->d_mac, IFHWADDRLEN); |
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picmp->icmpchksum = 0; |
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picmp->icmpchksum = ~uip_icmp6chksum(dev); |
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} |
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else |
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{ |
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goto drop; |
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} |
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} |
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else if (picmp->type == ICMP6_ECHO_REQUEST) |
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{ |
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/* ICMP echo (i.e., ping) processing. This is simple, we only |
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* change the ICMP type from ECHO to ECHO_REPLY and update the |
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* ICMP checksum before we return the packet. |
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*/ |
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picmp->type = ICMP6_ECHO_REPLY; |
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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr); |
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr); |
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picmp->icmpchksum = 0; |
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picmp->icmpchksum = ~uip_icmp6chksum(dev); |
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} |
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/* If an ICMP echo reply is received then there should also be |
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* a thread waiting to received the echo response. |
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*/ |
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#ifdef CONFIG_NET_ICMP_PING |
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else if (picmp->type == ICMP6_ECHO_REPLY && g_echocallback) |
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{ |
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uint16_t flags = UIP_ECHOREPLY; |
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if (g_echocallback) |
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{ |
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/* Dispatch the ECHO reply to the waiting thread */ |
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flags = uip_callbackexecute(dev, picmp, flags, g_echocallback); |
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} |
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/* If the ECHO reply was not handled, then drop the packet */ |
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if (flags == UIP_ECHOREPLY) |
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{ |
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/* The ECHO reply was not handled */ |
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goto drop; |
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} |
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} |
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#endif |
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else |
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{ |
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nlldbg("Unknown ICMP6 cmd: %d\n", picmp->type); |
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goto typeerr; |
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} |
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nllvdbg("Outgoing ICMP6 packet length: %d (%d)\n", |
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dev->d_len, (picmp->len[0] << 8) | picmp->len[1]); |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.sent++; |
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uip_stat.ip.sent++; |
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#endif |
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return; |
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typeerr: |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.typeerr++; |
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#endif |
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drop: |
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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.icmp.drop++; |
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#endif |
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dev->d_len = 0; |
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#endif /* !CONFIG_NET_IPv6 */ |
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} |
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#endif /* CONFIG_NET_ICMP */ |
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#endif /* CONFIG_NET */
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