[457] | 1 | /**
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| 2 | * @file
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| 3 | *
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| 4 | * IPv6 version of ICMP, as per RFC 4443.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (c) 2010 Inico Technologies Ltd.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Ivan Delamer <delamer@inicotech.com>
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| 36 | *
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| 37 | *
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| 38 | * Please coordinate changes and requests with Ivan Delamer
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| 39 | * <delamer@inicotech.com>
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| 40 | */
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| 41 |
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| 42 | #include "lwip/opt.h"
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| 43 |
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| 44 | #if LWIP_ICMP6 && LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
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| 45 |
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| 46 | #include "lwip/icmp6.h"
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| 47 | #include "lwip/prot/icmp6.h"
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| 48 | #include "lwip/ip6.h"
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| 49 | #include "lwip/ip6_addr.h"
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| 50 | #include "lwip/inet_chksum.h"
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| 51 | #include "lwip/pbuf.h"
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| 52 | #include "lwip/netif.h"
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| 53 | #include "lwip/nd6.h"
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| 54 | #include "lwip/mld6.h"
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| 55 | #include "lwip/ip.h"
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| 56 | #include "lwip/stats.h"
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| 57 |
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| 58 | #include <string.h>
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| 59 |
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| 60 | #if LWIP_ICMP6_DATASIZE == 0
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| 61 | #undef LWIP_ICMP6_DATASIZE
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| 62 | #define LWIP_ICMP6_DATASIZE 8
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| 63 | #endif
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| 64 |
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| 65 | /* Forward declarations */
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| 66 | static void icmp6_send_response(struct pbuf *p, u8_t code, u32_t data, u8_t type);
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| 67 | static void icmp6_send_response_with_addrs(struct pbuf *p, u8_t code, u32_t data,
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| 68 | u8_t type, const ip6_addr_t *src_addr, const ip6_addr_t *dest_addr);
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| 69 | static void icmp6_send_response_with_addrs_and_netif(struct pbuf *p, u8_t code, u32_t data,
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| 70 | u8_t type, const ip6_addr_t *src_addr, const ip6_addr_t *dest_addr, struct netif *netif);
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| 71 |
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| 72 |
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| 73 | /**
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| 74 | * Process an input ICMPv6 message. Called by ip6_input.
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| 75 | *
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| 76 | * Will generate a reply for echo requests. Other messages are forwarded
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| 77 | * to nd6_input, or mld6_input.
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| 78 | *
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| 79 | * @param p the mld packet, p->payload pointing to the icmpv6 header
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| 80 | * @param inp the netif on which this packet was received
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| 81 | */
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| 82 | void
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| 83 | icmp6_input(struct pbuf *p, struct netif *inp)
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| 84 | {
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| 85 | struct icmp6_hdr *icmp6hdr;
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| 86 | struct pbuf *r;
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| 87 | const ip6_addr_t *reply_src;
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| 88 |
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| 89 | ICMP6_STATS_INC(icmp6.recv);
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| 90 |
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| 91 | /* Check that ICMPv6 header fits in payload */
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| 92 | if (p->len < sizeof(struct icmp6_hdr)) {
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| 93 | /* drop short packets */
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| 94 | pbuf_free(p);
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| 95 | ICMP6_STATS_INC(icmp6.lenerr);
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| 96 | ICMP6_STATS_INC(icmp6.drop);
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| 97 | return;
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| 98 | }
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| 99 |
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| 100 | icmp6hdr = (struct icmp6_hdr *)p->payload;
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| 101 |
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| 102 | #if CHECKSUM_CHECK_ICMP6
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| 103 | IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_CHECK_ICMP6) {
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| 104 | if (ip6_chksum_pseudo(p, IP6_NEXTH_ICMP6, p->tot_len, ip6_current_src_addr(),
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| 105 | ip6_current_dest_addr()) != 0) {
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| 106 | /* Checksum failed */
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| 107 | pbuf_free(p);
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| 108 | ICMP6_STATS_INC(icmp6.chkerr);
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| 109 | ICMP6_STATS_INC(icmp6.drop);
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| 110 | return;
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| 111 | }
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| 112 | }
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| 113 | #endif /* CHECKSUM_CHECK_ICMP6 */
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| 114 |
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| 115 | switch (icmp6hdr->type) {
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| 116 | case ICMP6_TYPE_NA: /* Neighbor advertisement */
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| 117 | case ICMP6_TYPE_NS: /* Neighbor solicitation */
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| 118 | case ICMP6_TYPE_RA: /* Router advertisement */
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| 119 | case ICMP6_TYPE_RD: /* Redirect */
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| 120 | case ICMP6_TYPE_PTB: /* Packet too big */
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| 121 | nd6_input(p, inp);
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| 122 | return;
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| 123 | case ICMP6_TYPE_RS:
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| 124 | #if LWIP_IPV6_FORWARD
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| 125 | /* @todo implement router functionality */
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| 126 | #endif
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| 127 | break;
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| 128 | #if LWIP_IPV6_MLD
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| 129 | case ICMP6_TYPE_MLQ:
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| 130 | case ICMP6_TYPE_MLR:
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| 131 | case ICMP6_TYPE_MLD:
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| 132 | mld6_input(p, inp);
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| 133 | return;
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| 134 | #endif
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| 135 | case ICMP6_TYPE_EREQ:
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| 136 | #if !LWIP_MULTICAST_PING
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| 137 | /* multicast destination address? */
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| 138 | if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
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| 139 | /* drop */
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| 140 | pbuf_free(p);
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| 141 | ICMP6_STATS_INC(icmp6.drop);
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| 142 | return;
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| 143 | }
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| 144 | #endif /* LWIP_MULTICAST_PING */
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| 145 |
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| 146 | /* Allocate reply. */
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| 147 | r = pbuf_alloc(PBUF_IP, p->tot_len, PBUF_RAM);
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| 148 | if (r == NULL) {
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| 149 | /* drop */
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| 150 | pbuf_free(p);
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| 151 | ICMP6_STATS_INC(icmp6.memerr);
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| 152 | return;
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| 153 | }
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| 154 |
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| 155 | /* Copy echo request. */
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| 156 | if (pbuf_copy(r, p) != ERR_OK) {
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| 157 | /* drop */
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| 158 | pbuf_free(p);
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| 159 | pbuf_free(r);
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| 160 | ICMP6_STATS_INC(icmp6.err);
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| 161 | return;
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| 162 | }
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| 163 |
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| 164 | /* Determine reply source IPv6 address. */
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| 165 | #if LWIP_MULTICAST_PING
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| 166 | if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
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| 167 | reply_src = ip_2_ip6(ip6_select_source_address(inp, ip6_current_src_addr()));
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| 168 | if (reply_src == NULL) {
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| 169 | /* drop */
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| 170 | pbuf_free(p);
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| 171 | pbuf_free(r);
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| 172 | ICMP6_STATS_INC(icmp6.rterr);
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| 173 | return;
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| 174 | }
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| 175 | }
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| 176 | else
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| 177 | #endif /* LWIP_MULTICAST_PING */
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| 178 | {
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| 179 | reply_src = ip6_current_dest_addr();
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| 180 | }
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| 181 |
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| 182 | /* Set fields in reply. */
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| 183 | ((struct icmp6_echo_hdr *)(r->payload))->type = ICMP6_TYPE_EREP;
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| 184 | ((struct icmp6_echo_hdr *)(r->payload))->chksum = 0;
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| 185 | #if CHECKSUM_GEN_ICMP6
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| 186 | IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_GEN_ICMP6) {
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| 187 | ((struct icmp6_echo_hdr *)(r->payload))->chksum = ip6_chksum_pseudo(r,
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| 188 | IP6_NEXTH_ICMP6, r->tot_len, reply_src, ip6_current_src_addr());
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| 189 | }
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| 190 | #endif /* CHECKSUM_GEN_ICMP6 */
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| 191 |
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| 192 | /* Send reply. */
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| 193 | ICMP6_STATS_INC(icmp6.xmit);
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| 194 | ip6_output_if(r, reply_src, ip6_current_src_addr(),
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| 195 | LWIP_ICMP6_HL, 0, IP6_NEXTH_ICMP6, inp);
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| 196 | pbuf_free(r);
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| 197 |
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| 198 | break;
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| 199 | default:
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| 200 | ICMP6_STATS_INC(icmp6.proterr);
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| 201 | ICMP6_STATS_INC(icmp6.drop);
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| 202 | break;
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| 203 | }
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| 204 |
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| 205 | pbuf_free(p);
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| 206 | }
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| 207 |
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| 208 |
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| 209 | /**
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| 210 | * Send an icmpv6 'destination unreachable' packet.
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| 211 | *
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| 212 | * This function must be used only in direct response to a packet that is being
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| 213 | * received right now. Otherwise, address zones would be lost.
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| 214 | *
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| 215 | * @param p the input packet for which the 'unreachable' should be sent,
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| 216 | * p->payload pointing to the IPv6 header
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| 217 | * @param c ICMPv6 code for the unreachable type
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| 218 | */
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| 219 | void
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| 220 | icmp6_dest_unreach(struct pbuf *p, enum icmp6_dur_code c)
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| 221 | {
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| 222 | icmp6_send_response(p, c, 0, ICMP6_TYPE_DUR);
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| 223 | }
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| 224 |
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| 225 | /**
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| 226 | * Send an icmpv6 'packet too big' packet.
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| 227 | *
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| 228 | * This function must be used only in direct response to a packet that is being
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| 229 | * received right now. Otherwise, address zones would be lost.
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| 230 | *
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| 231 | * @param p the input packet for which the 'packet too big' should be sent,
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| 232 | * p->payload pointing to the IPv6 header
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| 233 | * @param mtu the maximum mtu that we can accept
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| 234 | */
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| 235 | void
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| 236 | icmp6_packet_too_big(struct pbuf *p, u32_t mtu)
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| 237 | {
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| 238 | icmp6_send_response(p, 0, mtu, ICMP6_TYPE_PTB);
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| 239 | }
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| 240 |
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| 241 | /**
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| 242 | * Send an icmpv6 'time exceeded' packet.
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| 243 | *
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| 244 | * This function must be used only in direct response to a packet that is being
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| 245 | * received right now. Otherwise, address zones would be lost.
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| 246 | *
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| 247 | * @param p the input packet for which the 'time exceeded' should be sent,
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| 248 | * p->payload pointing to the IPv6 header
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| 249 | * @param c ICMPv6 code for the time exceeded type
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| 250 | */
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| 251 | void
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| 252 | icmp6_time_exceeded(struct pbuf *p, enum icmp6_te_code c)
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| 253 | {
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| 254 | icmp6_send_response(p, c, 0, ICMP6_TYPE_TE);
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| 255 | }
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| 256 |
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| 257 | /**
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| 258 | * Send an icmpv6 'time exceeded' packet, with explicit source and destination
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| 259 | * addresses.
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| 260 | *
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| 261 | * This function may be used to send a response sometime after receiving the
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| 262 | * packet for which this response is meant. The provided source and destination
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| 263 | * addresses are used primarily to retain their zone information.
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| 264 | *
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| 265 | * @param p the input packet for which the 'time exceeded' should be sent,
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| 266 | * p->payload pointing to the IPv6 header
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| 267 | * @param c ICMPv6 code for the time exceeded type
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| 268 | * @param src_addr source address of the original packet, with zone information
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| 269 | * @param dest_addr destination address of the original packet, with zone
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| 270 | * information
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| 271 | */
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| 272 | void
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| 273 | icmp6_time_exceeded_with_addrs(struct pbuf *p, enum icmp6_te_code c,
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| 274 | const ip6_addr_t *src_addr, const ip6_addr_t *dest_addr)
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| 275 | {
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| 276 | icmp6_send_response_with_addrs(p, c, 0, ICMP6_TYPE_TE, src_addr, dest_addr);
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| 277 | }
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| 278 |
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| 279 | /**
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| 280 | * Send an icmpv6 'parameter problem' packet.
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| 281 | *
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| 282 | * This function must be used only in direct response to a packet that is being
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| 283 | * received right now. Otherwise, address zones would be lost and the calculated
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| 284 | * offset would be wrong (calculated against ip6_current_header()).
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| 285 | *
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| 286 | * @param p the input packet for which the 'param problem' should be sent,
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| 287 | * p->payload pointing to the IP header
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| 288 | * @param c ICMPv6 code for the param problem type
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| 289 | * @param pointer the pointer to the byte where the parameter is found
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| 290 | */
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| 291 | void
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| 292 | icmp6_param_problem(struct pbuf *p, enum icmp6_pp_code c, const void *pointer)
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| 293 | {
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| 294 | u32_t pointer_u32 = (u32_t)((const u8_t *)pointer - (const u8_t *)ip6_current_header());
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| 295 | icmp6_send_response(p, c, pointer_u32, ICMP6_TYPE_PP);
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| 296 | }
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| 297 |
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| 298 | /**
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| 299 | * Send an ICMPv6 packet in response to an incoming packet.
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| 300 | * The packet is sent *to* ip_current_src_addr() on ip_current_netif().
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| 301 | *
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| 302 | * @param p the input packet for which the response should be sent,
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| 303 | * p->payload pointing to the IPv6 header
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| 304 | * @param code Code of the ICMPv6 header
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| 305 | * @param data Additional 32-bit parameter in the ICMPv6 header
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| 306 | * @param type Type of the ICMPv6 header
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| 307 | */
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| 308 | static void
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| 309 | icmp6_send_response(struct pbuf *p, u8_t code, u32_t data, u8_t type)
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| 310 | {
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| 311 | const struct ip6_addr *reply_src, *reply_dest;
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| 312 | struct netif *netif = ip_current_netif();
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| 313 |
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| 314 | LWIP_ASSERT("icmpv6 packet not a direct response", netif != NULL);
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| 315 | reply_dest = ip6_current_src_addr();
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| 316 |
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| 317 | /* Select an address to use as source. */
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| 318 | reply_src = ip_2_ip6(ip6_select_source_address(netif, reply_dest));
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| 319 | if (reply_src == NULL) {
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| 320 | ICMP6_STATS_INC(icmp6.rterr);
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| 321 | return;
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| 322 | }
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| 323 | icmp6_send_response_with_addrs_and_netif(p, code, data, type, reply_src, reply_dest, netif);
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| 324 | }
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| 325 |
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| 326 | /**
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| 327 | * Send an ICMPv6 packet in response to an incoming packet.
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| 328 | *
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| 329 | * Call this function if the packet is NOT sent as a direct response to an
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| 330 | * incoming packet, but rather sometime later (e.g. for a fragment reassembly
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| 331 | * timeout). The caller must provide the zoned source and destination addresses
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| 332 | * from the original packet with the src_addr and dest_addr parameters. The
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| 333 | * reason for this approach is that while the addresses themselves are part of
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| 334 | * the original packet, their zone information is not, thus possibly resulting
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| 335 | * in a link-local response being sent over the wrong link.
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| 336 | *
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| 337 | * @param p the input packet for which the response should be sent,
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| 338 | * p->payload pointing to the IPv6 header
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| 339 | * @param code Code of the ICMPv6 header
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| 340 | * @param data Additional 32-bit parameter in the ICMPv6 header
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| 341 | * @param type Type of the ICMPv6 header
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| 342 | * @param src_addr original source address
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| 343 | * @param dest_addr original destination address
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| 344 | */
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| 345 | static void
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| 346 | icmp6_send_response_with_addrs(struct pbuf *p, u8_t code, u32_t data, u8_t type,
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| 347 | const ip6_addr_t *src_addr, const ip6_addr_t *dest_addr)
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| 348 | {
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| 349 | const struct ip6_addr *reply_src, *reply_dest;
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| 350 | struct netif *netif;
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| 351 |
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| 352 | /* Get the destination address and netif for this ICMP message. */
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| 353 | LWIP_ASSERT("must provide both source and destination", src_addr != NULL);
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| 354 | LWIP_ASSERT("must provide both source and destination", dest_addr != NULL);
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| 355 |
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| 356 | /* Special case, as ip6_current_xxx is either NULL, or points
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| 357 | to a different packet than the one that expired. */
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| 358 | IP6_ADDR_ZONECHECK(src_addr);
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| 359 | IP6_ADDR_ZONECHECK(dest_addr);
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| 360 | /* Swap source and destination for the reply. */
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| 361 | reply_dest = src_addr;
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| 362 | reply_src = dest_addr;
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| 363 | netif = ip6_route(reply_src, reply_dest);
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| 364 | if (netif == NULL) {
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| 365 | ICMP6_STATS_INC(icmp6.rterr);
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| 366 | return;
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| 367 | }
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| 368 | icmp6_send_response_with_addrs_and_netif(p, code, data, type, reply_src,
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| 369 | reply_dest, netif);
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| 370 | }
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| 371 |
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| 372 | /**
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| 373 | * Send an ICMPv6 packet (with srd/dst address and netif given).
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| 374 | *
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| 375 | * @param p the input packet for which the response should be sent,
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| 376 | * p->payload pointing to the IPv6 header
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| 377 | * @param code Code of the ICMPv6 header
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| 378 | * @param data Additional 32-bit parameter in the ICMPv6 header
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| 379 | * @param type Type of the ICMPv6 header
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| 380 | * @param reply_src source address of the packet to send
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| 381 | * @param reply_dest destination address of the packet to send
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| 382 | * @param netif netif to send the packet
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| 383 | */
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| 384 | static void
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| 385 | icmp6_send_response_with_addrs_and_netif(struct pbuf *p, u8_t code, u32_t data, u8_t type,
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| 386 | const ip6_addr_t *reply_src, const ip6_addr_t *reply_dest, struct netif *netif)
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| 387 | {
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| 388 | struct pbuf *q;
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| 389 | struct icmp6_hdr *icmp6hdr;
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| 390 |
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| 391 | /* ICMPv6 header + IPv6 header + data */
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| 392 | q = pbuf_alloc(PBUF_IP, sizeof(struct icmp6_hdr) + IP6_HLEN + LWIP_ICMP6_DATASIZE,
|
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| 393 | PBUF_RAM);
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| 394 | if (q == NULL) {
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| 395 | LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMPv6 packet.\n"));
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| 396 | ICMP6_STATS_INC(icmp6.memerr);
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| 397 | return;
|
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| 398 | }
|
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| 399 | LWIP_ASSERT("check that first pbuf can hold icmp 6message",
|
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| 400 | (q->len >= (sizeof(struct icmp6_hdr) + IP6_HLEN + LWIP_ICMP6_DATASIZE)));
|
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| 401 |
|
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| 402 | icmp6hdr = (struct icmp6_hdr *)q->payload;
|
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| 403 | icmp6hdr->type = type;
|
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| 404 | icmp6hdr->code = code;
|
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| 405 | icmp6hdr->data = lwip_htonl(data);
|
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| 406 |
|
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| 407 | /* copy fields from original packet */
|
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| 408 | SMEMCPY((u8_t *)q->payload + sizeof(struct icmp6_hdr), (u8_t *)p->payload,
|
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| 409 | IP6_HLEN + LWIP_ICMP6_DATASIZE);
|
---|
| 410 |
|
---|
| 411 | /* calculate checksum */
|
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| 412 | icmp6hdr->chksum = 0;
|
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| 413 | #if CHECKSUM_GEN_ICMP6
|
---|
| 414 | IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_ICMP6) {
|
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| 415 | icmp6hdr->chksum = ip6_chksum_pseudo(q, IP6_NEXTH_ICMP6, q->tot_len,
|
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| 416 | reply_src, reply_dest);
|
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| 417 | }
|
---|
| 418 | #endif /* CHECKSUM_GEN_ICMP6 */
|
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| 419 |
|
---|
| 420 | ICMP6_STATS_INC(icmp6.xmit);
|
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| 421 | ip6_output_if(q, reply_src, reply_dest, LWIP_ICMP6_HL, 0, IP6_NEXTH_ICMP6, netif);
|
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| 422 | pbuf_free(q);
|
---|
| 423 | }
|
---|
| 424 |
|
---|
| 425 | #endif /* LWIP_ICMP6 && LWIP_IPV6 */
|
---|