[457] | 1 | /**
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| 2 | * @file
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| 3 | *
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| 4 | * IPv6 layer.
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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_IPV6 /* don't build if not configured for use in lwipopts.h */
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| 45 |
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| 46 | #include "lwip/def.h"
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| 47 | #include "lwip/mem.h"
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| 48 | #include "lwip/netif.h"
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| 49 | #include "lwip/ip.h"
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| 50 | #include "lwip/ip6.h"
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| 51 | #include "lwip/ip6_addr.h"
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| 52 | #include "lwip/ip6_frag.h"
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| 53 | #include "lwip/icmp6.h"
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| 54 | #include "lwip/priv/raw_priv.h"
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| 55 | #include "lwip/udp.h"
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| 56 | #include "lwip/priv/tcp_priv.h"
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| 57 | #include "lwip/dhcp6.h"
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| 58 | #include "lwip/nd6.h"
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| 59 | #include "lwip/mld6.h"
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| 60 | #include "lwip/debug.h"
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| 61 | #include "lwip/stats.h"
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| 62 |
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| 63 | #ifdef LWIP_HOOK_FILENAME
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| 64 | #include LWIP_HOOK_FILENAME
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| 65 | #endif
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| 66 |
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| 67 | /**
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| 68 | * Finds the appropriate network interface for a given IPv6 address. It tries to select
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| 69 | * a netif following a sequence of heuristics:
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| 70 | * 1) if there is only 1 netif, return it
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| 71 | * 2) if the destination is a zoned address, match its zone to a netif
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| 72 | * 3) if the either the source or destination address is a scoped address,
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| 73 | * match the source address's zone (if set) or address (if not) to a netif
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| 74 | * 4) tries to match the destination subnet to a configured address
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| 75 | * 5) tries to find a router-announced route
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| 76 | * 6) tries to match the (unscoped) source address to the netif
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| 77 | * 7) returns the default netif, if configured
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| 78 | *
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| 79 | * Note that each of the two given addresses may or may not be properly zoned.
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| 80 | *
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| 81 | * @param src the source IPv6 address, if known
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| 82 | * @param dest the destination IPv6 address for which to find the route
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| 83 | * @return the netif on which to send to reach dest
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| 84 | */
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| 85 | struct netif *
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| 86 | ip6_route(const ip6_addr_t *src, const ip6_addr_t *dest)
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| 87 | {
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| 88 | #if LWIP_SINGLE_NETIF
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| 89 | LWIP_UNUSED_ARG(src);
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| 90 | LWIP_UNUSED_ARG(dest);
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| 91 | #else /* LWIP_SINGLE_NETIF */
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| 92 | struct netif *netif;
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| 93 | s8_t i;
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| 94 |
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| 95 | LWIP_ASSERT_CORE_LOCKED();
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| 96 |
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| 97 | /* If single netif configuration, fast return. */
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| 98 | if ((netif_list != NULL) && (netif_list->next == NULL)) {
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| 99 | if (!netif_is_up(netif_list) || !netif_is_link_up(netif_list) ||
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| 100 | (ip6_addr_has_zone(dest) && !ip6_addr_test_zone(dest, netif_list))) {
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| 101 | return NULL;
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| 102 | }
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| 103 | return netif_list;
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| 104 | }
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| 105 |
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| 106 | #if LWIP_IPV6_SCOPES
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| 107 | /* Special processing for zoned destination addresses. This includes link-
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| 108 | * local unicast addresses and interface/link-local multicast addresses. Use
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| 109 | * the zone to find a matching netif. If the address is not zoned, then there
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| 110 | * is technically no "wrong" netif to choose, and we leave routing to other
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| 111 | * rules; in most cases this should be the scoped-source rule below. */
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| 112 | if (ip6_addr_has_zone(dest)) {
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| 113 | IP6_ADDR_ZONECHECK(dest);
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| 114 | /* Find a netif based on the zone. For custom mappings, one zone may map
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| 115 | * to multiple netifs, so find one that can actually send a packet. */
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| 116 | NETIF_FOREACH(netif) {
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| 117 | if (ip6_addr_test_zone(dest, netif) &&
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| 118 | netif_is_up(netif) && netif_is_link_up(netif)) {
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| 119 | return netif;
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| 120 | }
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| 121 | }
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| 122 | /* No matching netif found. Do no try to route to a different netif,
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| 123 | * as that would be a zone violation, resulting in any packets sent to
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| 124 | * that netif being dropped on output. */
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| 125 | return NULL;
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| 126 | }
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| 127 | #endif /* LWIP_IPV6_SCOPES */
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| 128 |
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| 129 | /* Special processing for scoped source and destination addresses. If we get
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| 130 | * here, the destination address does not have a zone, so either way we need
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| 131 | * to look at the source address, which may or may not have a zone. If it
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| 132 | * does, the zone is restrictive: there is (typically) only one matching
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| 133 | * netif for it, and we should avoid routing to any other netif as that would
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| 134 | * result in guaranteed zone violations. For scoped source addresses that do
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| 135 | * not have a zone, use (only) a netif that has that source address locally
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| 136 | * assigned. This case also applies to the loopback source address, which has
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| 137 | * an implied link-local scope. If only the destination address is scoped
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| 138 | * (but, again, not zoned), we still want to use only the source address to
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| 139 | * determine its zone because that's most likely what the user/application
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| 140 | * wants, regardless of whether the source address is scoped. Finally, some
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| 141 | * of this story also applies if scoping is disabled altogether. */
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| 142 | #if LWIP_IPV6_SCOPES
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| 143 | if (ip6_addr_has_scope(dest, IP6_UNKNOWN) ||
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| 144 | ip6_addr_has_scope(src, IP6_UNICAST) ||
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| 145 | #else /* LWIP_IPV6_SCOPES */
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| 146 | if (ip6_addr_islinklocal(dest) || ip6_addr_ismulticast_iflocal(dest) ||
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| 147 | ip6_addr_ismulticast_linklocal(dest) || ip6_addr_islinklocal(src) ||
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| 148 | #endif /* LWIP_IPV6_SCOPES */
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| 149 | ip6_addr_isloopback(src)) {
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| 150 | #if LWIP_IPV6_SCOPES
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| 151 | if (ip6_addr_has_zone(src)) {
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| 152 | /* Find a netif matching the source zone (relatively cheap). */
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| 153 | NETIF_FOREACH(netif) {
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| 154 | if (netif_is_up(netif) && netif_is_link_up(netif) &&
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| 155 | ip6_addr_test_zone(src, netif)) {
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| 156 | return netif;
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| 157 | }
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| 158 | }
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| 159 | } else
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| 160 | #endif /* LWIP_IPV6_SCOPES */
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| 161 | {
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| 162 | /* Find a netif matching the source address (relatively expensive). */
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| 163 | NETIF_FOREACH(netif) {
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| 164 | if (!netif_is_up(netif) || !netif_is_link_up(netif)) {
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| 165 | continue;
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| 166 | }
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| 167 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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| 168 | if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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| 169 | ip6_addr_cmp_zoneless(src, netif_ip6_addr(netif, i))) {
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| 170 | return netif;
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| 171 | }
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| 172 | }
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| 173 | }
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| 174 | }
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| 175 | /* Again, do not use any other netif in this case, as that could result in
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| 176 | * zone boundary violations. */
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| 177 | return NULL;
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| 178 | }
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| 179 |
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| 180 | /* We come here only if neither source nor destination is scoped. */
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| 181 | IP6_ADDR_ZONECHECK(src);
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| 182 |
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| 183 | #ifdef LWIP_HOOK_IP6_ROUTE
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| 184 | netif = LWIP_HOOK_IP6_ROUTE(src, dest);
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| 185 | if (netif != NULL) {
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| 186 | return netif;
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| 187 | }
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| 188 | #endif
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| 189 |
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| 190 | /* See if the destination subnet matches a configured address. In accordance
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| 191 | * with RFC 5942, dynamically configured addresses do not have an implied
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| 192 | * local subnet, and thus should be considered /128 assignments. However, as
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| 193 | * such, the destination address may still match a local address, and so we
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| 194 | * still need to check for exact matches here. By (lwIP) policy, statically
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| 195 | * configured addresses do always have an implied local /64 subnet. */
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| 196 | NETIF_FOREACH(netif) {
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| 197 | if (!netif_is_up(netif) || !netif_is_link_up(netif)) {
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| 198 | continue;
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| 199 | }
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| 200 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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| 201 | if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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| 202 | ip6_addr_netcmp(dest, netif_ip6_addr(netif, i)) &&
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| 203 | (netif_ip6_addr_isstatic(netif, i) ||
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| 204 | ip6_addr_nethostcmp(dest, netif_ip6_addr(netif, i)))) {
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| 205 | return netif;
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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 | /* Get the netif for a suitable router-announced route. */
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| 211 | netif = nd6_find_route(dest);
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| 212 | if (netif != NULL) {
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| 213 | return netif;
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| 214 | }
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| 215 |
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| 216 | /* Try with the netif that matches the source address. Given the earlier rule
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| 217 | * for scoped source addresses, this applies to unscoped addresses only. */
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| 218 | if (!ip6_addr_isany(src)) {
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| 219 | NETIF_FOREACH(netif) {
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| 220 | if (!netif_is_up(netif) || !netif_is_link_up(netif)) {
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| 221 | continue;
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| 222 | }
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| 223 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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| 224 | if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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| 225 | ip6_addr_cmp(src, netif_ip6_addr(netif, i))) {
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| 226 | return netif;
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| 227 | }
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| 228 | }
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| 229 | }
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| 230 | }
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| 231 |
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| 232 | #if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF
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| 233 | /* loopif is disabled, loopback traffic is passed through any netif */
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| 234 | if (ip6_addr_isloopback(dest)) {
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| 235 | /* don't check for link on loopback traffic */
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| 236 | if (netif_default != NULL && netif_is_up(netif_default)) {
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| 237 | return netif_default;
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| 238 | }
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| 239 | /* default netif is not up, just use any netif for loopback traffic */
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| 240 | NETIF_FOREACH(netif) {
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| 241 | if (netif_is_up(netif)) {
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| 242 | return netif;
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| 243 | }
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| 244 | }
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| 245 | return NULL;
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| 246 | }
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| 247 | #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
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| 248 | #endif /* !LWIP_SINGLE_NETIF */
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| 249 |
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| 250 | /* no matching netif found, use default netif, if up */
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| 251 | if ((netif_default == NULL) || !netif_is_up(netif_default) || !netif_is_link_up(netif_default)) {
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| 252 | return NULL;
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| 253 | }
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| 254 | return netif_default;
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| 255 | }
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| 256 |
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| 257 | /**
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| 258 | * @ingroup ip6
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| 259 | * Select the best IPv6 source address for a given destination IPv6 address.
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| 260 | *
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| 261 | * This implementation follows RFC 6724 Sec. 5 to the following extent:
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| 262 | * - Rules 1, 2, 3: fully implemented
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| 263 | * - Rules 4, 5, 5.5: not applicable
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| 264 | * - Rule 6: not implemented
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| 265 | * - Rule 7: not applicable
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| 266 | * - Rule 8: limited to "prefer /64 subnet match over non-match"
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| 267 | *
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| 268 | * For Rule 2, we deliberately deviate from RFC 6724 Sec. 3.1 by considering
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| 269 | * ULAs to be of smaller scope than global addresses, to avoid that a preferred
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| 270 | * ULA is picked over a deprecated global address when given a global address
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| 271 | * as destination, as that would likely result in broken two-way communication.
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| 272 | *
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| 273 | * As long as temporary addresses are not supported (as used in Rule 7), a
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| 274 | * proper implementation of Rule 8 would obviate the need to implement Rule 6.
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| 275 | *
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| 276 | * @param netif the netif on which to send a packet
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| 277 | * @param dest the destination we are trying to reach (possibly not properly
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| 278 | * zoned)
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| 279 | * @return the most suitable source address to use, or NULL if no suitable
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| 280 | * source address is found
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| 281 | */
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| 282 | const ip_addr_t *
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| 283 | ip6_select_source_address(struct netif *netif, const ip6_addr_t *dest)
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| 284 | {
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| 285 | const ip_addr_t *best_addr;
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| 286 | const ip6_addr_t *cand_addr;
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| 287 | s8_t dest_scope, cand_scope;
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| 288 | s8_t best_scope = IP6_MULTICAST_SCOPE_RESERVED;
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| 289 | u8_t i, cand_pref, cand_bits;
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| 290 | u8_t best_pref = 0;
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| 291 | u8_t best_bits = 0;
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| 292 |
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| 293 | /* Start by determining the scope of the given destination address. These
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| 294 | * tests are hopefully (roughly) in order of likeliness to match. */
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| 295 | if (ip6_addr_isglobal(dest)) {
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| 296 | dest_scope = IP6_MULTICAST_SCOPE_GLOBAL;
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| 297 | } else if (ip6_addr_islinklocal(dest) || ip6_addr_isloopback(dest)) {
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| 298 | dest_scope = IP6_MULTICAST_SCOPE_LINK_LOCAL;
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| 299 | } else if (ip6_addr_isuniquelocal(dest)) {
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| 300 | dest_scope = IP6_MULTICAST_SCOPE_ORGANIZATION_LOCAL;
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| 301 | } else if (ip6_addr_ismulticast(dest)) {
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| 302 | dest_scope = ip6_addr_multicast_scope(dest);
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| 303 | } else if (ip6_addr_issitelocal(dest)) {
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| 304 | dest_scope = IP6_MULTICAST_SCOPE_SITE_LOCAL;
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| 305 | } else {
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| 306 | /* no match, consider scope global */
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| 307 | dest_scope = IP6_MULTICAST_SCOPE_GLOBAL;
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| 308 | }
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| 309 |
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| 310 | best_addr = NULL;
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| 311 |
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| 312 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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| 313 | /* Consider only valid (= preferred and deprecated) addresses. */
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| 314 | if (!ip6_addr_isvalid(netif_ip6_addr_state(netif, i))) {
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| 315 | continue;
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| 316 | }
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| 317 | /* Determine the scope of this candidate address. Same ordering idea. */
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| 318 | cand_addr = netif_ip6_addr(netif, i);
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| 319 | if (ip6_addr_isglobal(cand_addr)) {
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| 320 | cand_scope = IP6_MULTICAST_SCOPE_GLOBAL;
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| 321 | } else if (ip6_addr_islinklocal(cand_addr)) {
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| 322 | cand_scope = IP6_MULTICAST_SCOPE_LINK_LOCAL;
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| 323 | } else if (ip6_addr_isuniquelocal(cand_addr)) {
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| 324 | cand_scope = IP6_MULTICAST_SCOPE_ORGANIZATION_LOCAL;
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| 325 | } else if (ip6_addr_issitelocal(cand_addr)) {
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| 326 | cand_scope = IP6_MULTICAST_SCOPE_SITE_LOCAL;
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| 327 | } else {
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| 328 | /* no match, treat as low-priority global scope */
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| 329 | cand_scope = IP6_MULTICAST_SCOPE_RESERVEDF;
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| 330 | }
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| 331 | cand_pref = ip6_addr_ispreferred(netif_ip6_addr_state(netif, i));
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| 332 | /* @todo compute the actual common bits, for longest matching prefix. */
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| 333 | /* We cannot count on the destination address having a proper zone
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| 334 | * assignment, so do not compare zones in this case. */
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| 335 | cand_bits = ip6_addr_netcmp_zoneless(cand_addr, dest); /* just 1 or 0 for now */
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| 336 | if (cand_bits && ip6_addr_nethostcmp(cand_addr, dest)) {
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| 337 | return netif_ip_addr6(netif, i); /* Rule 1 */
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| 338 | }
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| 339 | if ((best_addr == NULL) || /* no alternative yet */
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| 340 | ((cand_scope < best_scope) && (cand_scope >= dest_scope)) ||
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| 341 | ((cand_scope > best_scope) && (best_scope < dest_scope)) || /* Rule 2 */
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| 342 | ((cand_scope == best_scope) && ((cand_pref > best_pref) || /* Rule 3 */
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| 343 | ((cand_pref == best_pref) && (cand_bits > best_bits))))) { /* Rule 8 */
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| 344 | /* We found a new "winning" candidate. */
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| 345 | best_addr = netif_ip_addr6(netif, i);
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| 346 | best_scope = cand_scope;
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| 347 | best_pref = cand_pref;
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| 348 | best_bits = cand_bits;
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| 349 | }
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| 350 | }
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| 351 |
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| 352 | return best_addr; /* may be NULL */
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| 353 | }
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| 354 |
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| 355 | #if LWIP_IPV6_FORWARD
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| 356 | /**
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| 357 | * Forwards an IPv6 packet. It finds an appropriate route for the
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| 358 | * packet, decrements the HL value of the packet, and outputs
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| 359 | * the packet on the appropriate interface.
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| 360 | *
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| 361 | * @param p the packet to forward (p->payload points to IP header)
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| 362 | * @param iphdr the IPv6 header of the input packet
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| 363 | * @param inp the netif on which this packet was received
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| 364 | */
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| 365 | static void
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| 366 | ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp)
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| 367 | {
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| 368 | struct netif *netif;
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| 369 |
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| 370 | /* do not forward link-local or loopback addresses */
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| 371 | if (ip6_addr_islinklocal(ip6_current_dest_addr()) ||
|
---|
| 372 | ip6_addr_isloopback(ip6_current_dest_addr())) {
|
---|
| 373 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding link-local address.\n"));
|
---|
| 374 | IP6_STATS_INC(ip6.rterr);
|
---|
| 375 | IP6_STATS_INC(ip6.drop);
|
---|
| 376 | return;
|
---|
| 377 | }
|
---|
| 378 |
|
---|
| 379 | /* Find network interface where to forward this IP packet to. */
|
---|
| 380 | netif = ip6_route(IP6_ADDR_ANY6, ip6_current_dest_addr());
|
---|
| 381 | if (netif == NULL) {
|
---|
| 382 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
|
---|
| 383 | IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
|
---|
| 384 | IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
|
---|
| 385 | IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
|
---|
| 386 | IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
|
---|
| 387 | IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
|
---|
| 388 | IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
|
---|
| 389 | IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
|
---|
| 390 | IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
|
---|
| 391 | #if LWIP_ICMP6
|
---|
| 392 | /* Don't send ICMP messages in response to ICMP messages */
|
---|
| 393 | if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
|
---|
| 394 | icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE);
|
---|
| 395 | }
|
---|
| 396 | #endif /* LWIP_ICMP6 */
|
---|
| 397 | IP6_STATS_INC(ip6.rterr);
|
---|
| 398 | IP6_STATS_INC(ip6.drop);
|
---|
| 399 | return;
|
---|
| 400 | }
|
---|
| 401 | #if LWIP_IPV6_SCOPES
|
---|
| 402 | /* Do not forward packets with a zoned (e.g., link-local) source address
|
---|
| 403 | * outside of their zone. We determined the zone a bit earlier, so we know
|
---|
| 404 | * that the address is properly zoned here, so we can safely use has_zone.
|
---|
| 405 | * Also skip packets with a loopback source address (link-local implied). */
|
---|
| 406 | if ((ip6_addr_has_zone(ip6_current_src_addr()) &&
|
---|
| 407 | !ip6_addr_test_zone(ip6_current_src_addr(), netif)) ||
|
---|
| 408 | ip6_addr_isloopback(ip6_current_src_addr())) {
|
---|
| 409 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding packet beyond its source address zone.\n"));
|
---|
| 410 | IP6_STATS_INC(ip6.rterr);
|
---|
| 411 | IP6_STATS_INC(ip6.drop);
|
---|
| 412 | return;
|
---|
| 413 | }
|
---|
| 414 | #endif /* LWIP_IPV6_SCOPES */
|
---|
| 415 | /* Do not forward packets onto the same network interface on which
|
---|
| 416 | * they arrived. */
|
---|
| 417 | if (netif == inp) {
|
---|
| 418 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not bouncing packets back on incoming interface.\n"));
|
---|
| 419 | IP6_STATS_INC(ip6.rterr);
|
---|
| 420 | IP6_STATS_INC(ip6.drop);
|
---|
| 421 | return;
|
---|
| 422 | }
|
---|
| 423 |
|
---|
| 424 | /* decrement HL */
|
---|
| 425 | IP6H_HOPLIM_SET(iphdr, IP6H_HOPLIM(iphdr) - 1);
|
---|
| 426 | /* send ICMP6 if HL == 0 */
|
---|
| 427 | if (IP6H_HOPLIM(iphdr) == 0) {
|
---|
| 428 | #if LWIP_ICMP6
|
---|
| 429 | /* Don't send ICMP messages in response to ICMP messages */
|
---|
| 430 | if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
|
---|
| 431 | icmp6_time_exceeded(p, ICMP6_TE_HL);
|
---|
| 432 | }
|
---|
| 433 | #endif /* LWIP_ICMP6 */
|
---|
| 434 | IP6_STATS_INC(ip6.drop);
|
---|
| 435 | return;
|
---|
| 436 | }
|
---|
| 437 |
|
---|
| 438 | if (netif->mtu && (p->tot_len > netif->mtu)) {
|
---|
| 439 | #if LWIP_ICMP6
|
---|
| 440 | /* Don't send ICMP messages in response to ICMP messages */
|
---|
| 441 | if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
|
---|
| 442 | icmp6_packet_too_big(p, netif->mtu);
|
---|
| 443 | }
|
---|
| 444 | #endif /* LWIP_ICMP6 */
|
---|
| 445 | IP6_STATS_INC(ip6.drop);
|
---|
| 446 | return;
|
---|
| 447 | }
|
---|
| 448 |
|
---|
| 449 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: forwarding packet to %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
|
---|
| 450 | IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
|
---|
| 451 | IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
|
---|
| 452 | IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
|
---|
| 453 | IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
|
---|
| 454 | IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
|
---|
| 455 | IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
|
---|
| 456 | IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
|
---|
| 457 | IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
|
---|
| 458 |
|
---|
| 459 | /* transmit pbuf on chosen interface */
|
---|
| 460 | netif->output_ip6(netif, p, ip6_current_dest_addr());
|
---|
| 461 | IP6_STATS_INC(ip6.fw);
|
---|
| 462 | IP6_STATS_INC(ip6.xmit);
|
---|
| 463 | return;
|
---|
| 464 | }
|
---|
| 465 | #endif /* LWIP_IPV6_FORWARD */
|
---|
| 466 |
|
---|
| 467 | /** Return true if the current input packet should be accepted on this netif */
|
---|
| 468 | static int
|
---|
| 469 | ip6_input_accept(struct netif *netif)
|
---|
| 470 | {
|
---|
| 471 | /* interface is up? */
|
---|
| 472 | if (netif_is_up(netif)) {
|
---|
| 473 | u8_t i;
|
---|
| 474 | /* unicast to this interface address? address configured? */
|
---|
| 475 | /* If custom scopes are used, the destination zone will be tested as
|
---|
| 476 | * part of the local-address comparison, but we need to test the source
|
---|
| 477 | * scope as well (e.g., is this interface on the same link?). */
|
---|
| 478 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
|
---|
| 479 | if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
|
---|
| 480 | ip6_addr_cmp(ip6_current_dest_addr(), netif_ip6_addr(netif, i))
|
---|
| 481 | #if IPV6_CUSTOM_SCOPES
|
---|
| 482 | && (!ip6_addr_has_zone(ip6_current_src_addr()) ||
|
---|
| 483 | ip6_addr_test_zone(ip6_current_src_addr(), netif))
|
---|
| 484 | #endif /* IPV6_CUSTOM_SCOPES */
|
---|
| 485 | ) {
|
---|
| 486 | /* accept on this netif */
|
---|
| 487 | return 1;
|
---|
| 488 | }
|
---|
| 489 | }
|
---|
| 490 | }
|
---|
| 491 | return 0;
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | /**
|
---|
| 495 | * This function is called by the network interface device driver when
|
---|
| 496 | * an IPv6 packet is received. The function does the basic checks of the
|
---|
| 497 | * IP header such as packet size being at least larger than the header
|
---|
| 498 | * size etc. If the packet was not destined for us, the packet is
|
---|
| 499 | * forwarded (using ip6_forward).
|
---|
| 500 | *
|
---|
| 501 | * Finally, the packet is sent to the upper layer protocol input function.
|
---|
| 502 | *
|
---|
| 503 | * @param p the received IPv6 packet (p->payload points to IPv6 header)
|
---|
| 504 | * @param inp the netif on which this packet was received
|
---|
| 505 | * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
|
---|
| 506 | * processed, but currently always returns ERR_OK)
|
---|
| 507 | */
|
---|
| 508 | err_t
|
---|
| 509 | ip6_input(struct pbuf *p, struct netif *inp)
|
---|
| 510 | {
|
---|
| 511 | struct ip6_hdr *ip6hdr;
|
---|
| 512 | struct netif *netif;
|
---|
| 513 | const u8_t *nexth;
|
---|
| 514 | u16_t hlen, hlen_tot; /* the current header length */
|
---|
| 515 | #if 0 /*IP_ACCEPT_LINK_LAYER_ADDRESSING*/
|
---|
| 516 | @todo
|
---|
| 517 | int check_ip_src=1;
|
---|
| 518 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
| 519 | #if LWIP_RAW
|
---|
| 520 | raw_input_state_t raw_status;
|
---|
| 521 | #endif /* LWIP_RAW */
|
---|
| 522 |
|
---|
| 523 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 524 |
|
---|
| 525 | IP6_STATS_INC(ip6.recv);
|
---|
| 526 |
|
---|
| 527 | /* identify the IP header */
|
---|
| 528 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 529 | if (IP6H_V(ip6hdr) != 6) {
|
---|
| 530 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IPv6 packet dropped due to bad version number %"U32_F"\n",
|
---|
| 531 | IP6H_V(ip6hdr)));
|
---|
| 532 | pbuf_free(p);
|
---|
| 533 | IP6_STATS_INC(ip6.err);
|
---|
| 534 | IP6_STATS_INC(ip6.drop);
|
---|
| 535 | return ERR_OK;
|
---|
| 536 | }
|
---|
| 537 |
|
---|
| 538 | #ifdef LWIP_HOOK_IP6_INPUT
|
---|
| 539 | if (LWIP_HOOK_IP6_INPUT(p, inp)) {
|
---|
| 540 | /* the packet has been eaten */
|
---|
| 541 | return ERR_OK;
|
---|
| 542 | }
|
---|
| 543 | #endif
|
---|
| 544 |
|
---|
| 545 | /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
|
---|
| 546 | if ((IP6_HLEN > p->len) || (IP6H_PLEN(ip6hdr) > (p->tot_len - IP6_HLEN))) {
|
---|
| 547 | if (IP6_HLEN > p->len) {
|
---|
| 548 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 549 | ("IPv6 header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
|
---|
| 550 | (u16_t)IP6_HLEN, p->len));
|
---|
| 551 | }
|
---|
| 552 | if ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len) {
|
---|
| 553 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 554 | ("IPv6 (plen %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
|
---|
| 555 | (u16_t)(IP6H_PLEN(ip6hdr) + IP6_HLEN), p->tot_len));
|
---|
| 556 | }
|
---|
| 557 | /* free (drop) packet pbufs */
|
---|
| 558 | pbuf_free(p);
|
---|
| 559 | IP6_STATS_INC(ip6.lenerr);
|
---|
| 560 | IP6_STATS_INC(ip6.drop);
|
---|
| 561 | return ERR_OK;
|
---|
| 562 | }
|
---|
| 563 |
|
---|
| 564 | /* Trim pbuf. This should have been done at the netif layer,
|
---|
| 565 | * but we'll do it anyway just to be sure that its done. */
|
---|
| 566 | pbuf_realloc(p, (u16_t)(IP6_HLEN + IP6H_PLEN(ip6hdr)));
|
---|
| 567 |
|
---|
| 568 | /* copy IP addresses to aligned ip6_addr_t */
|
---|
| 569 | ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_dest, ip6hdr->dest);
|
---|
| 570 | ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_src, ip6hdr->src);
|
---|
| 571 |
|
---|
| 572 | /* Don't accept virtual IPv4 mapped IPv6 addresses.
|
---|
| 573 | * Don't accept multicast source addresses. */
|
---|
| 574 | if (ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_dest)) ||
|
---|
| 575 | ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_src)) ||
|
---|
| 576 | ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_src))) {
|
---|
| 577 | /* free (drop) packet pbufs */
|
---|
| 578 | pbuf_free(p);
|
---|
| 579 | IP6_STATS_INC(ip6.err);
|
---|
| 580 | IP6_STATS_INC(ip6.drop);
|
---|
| 581 | return ERR_OK;
|
---|
| 582 | }
|
---|
| 583 |
|
---|
| 584 | /* Set the appropriate zone identifier on the addresses. */
|
---|
| 585 | ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_dest), IP6_UNKNOWN, inp);
|
---|
| 586 | ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_src), IP6_UNICAST, inp);
|
---|
| 587 |
|
---|
| 588 | /* current header pointer. */
|
---|
| 589 | ip_data.current_ip6_header = ip6hdr;
|
---|
| 590 |
|
---|
| 591 | /* In netif, used in case we need to send ICMPv6 packets back. */
|
---|
| 592 | ip_data.current_netif = inp;
|
---|
| 593 | ip_data.current_input_netif = inp;
|
---|
| 594 |
|
---|
| 595 | /* match packet against an interface, i.e. is this packet for us? */
|
---|
| 596 | if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
|
---|
| 597 | /* Always joined to multicast if-local and link-local all-nodes group. */
|
---|
| 598 | if (ip6_addr_isallnodes_iflocal(ip6_current_dest_addr()) ||
|
---|
| 599 | ip6_addr_isallnodes_linklocal(ip6_current_dest_addr())) {
|
---|
| 600 | netif = inp;
|
---|
| 601 | }
|
---|
| 602 | #if LWIP_IPV6_MLD
|
---|
| 603 | else if (mld6_lookfor_group(inp, ip6_current_dest_addr())) {
|
---|
| 604 | netif = inp;
|
---|
| 605 | }
|
---|
| 606 | #else /* LWIP_IPV6_MLD */
|
---|
| 607 | else if (ip6_addr_issolicitednode(ip6_current_dest_addr())) {
|
---|
| 608 | u8_t i;
|
---|
| 609 | /* Filter solicited node packets when MLD is not enabled
|
---|
| 610 | * (for Neighbor discovery). */
|
---|
| 611 | netif = NULL;
|
---|
| 612 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
|
---|
| 613 | if (ip6_addr_isvalid(netif_ip6_addr_state(inp, i)) &&
|
---|
| 614 | ip6_addr_cmp_solicitednode(ip6_current_dest_addr(), netif_ip6_addr(inp, i))) {
|
---|
| 615 | netif = inp;
|
---|
| 616 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: solicited node packet accepted on interface %c%c\n",
|
---|
| 617 | netif->name[0], netif->name[1]));
|
---|
| 618 | break;
|
---|
| 619 | }
|
---|
| 620 | }
|
---|
| 621 | }
|
---|
| 622 | #endif /* LWIP_IPV6_MLD */
|
---|
| 623 | else {
|
---|
| 624 | netif = NULL;
|
---|
| 625 | }
|
---|
| 626 | } else {
|
---|
| 627 | /* start trying with inp. if that's not acceptable, start walking the
|
---|
| 628 | list of configured netifs. */
|
---|
| 629 | if (ip6_input_accept(inp)) {
|
---|
| 630 | netif = inp;
|
---|
| 631 | } else {
|
---|
| 632 | netif = NULL;
|
---|
| 633 | #if !IPV6_CUSTOM_SCOPES
|
---|
| 634 | /* Shortcut: stop looking for other interfaces if either the source or
|
---|
| 635 | * the destination has a scope constrained to this interface. Custom
|
---|
| 636 | * scopes may break the 1:1 link/interface mapping, however. */
|
---|
| 637 | if (ip6_addr_islinklocal(ip6_current_dest_addr()) ||
|
---|
| 638 | ip6_addr_islinklocal(ip6_current_src_addr())) {
|
---|
| 639 | goto netif_found;
|
---|
| 640 | }
|
---|
| 641 | #endif /* !IPV6_CUSTOM_SCOPES */
|
---|
| 642 | #if !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF
|
---|
| 643 | /* The loopback address is to be considered link-local. Packets to it
|
---|
| 644 | * should be dropped on other interfaces, as per RFC 4291 Sec. 2.5.3.
|
---|
| 645 | * Its implied scope means packets *from* the loopback address should
|
---|
| 646 | * not be accepted on other interfaces, either. These requirements
|
---|
| 647 | * cannot be implemented in the case that loopback traffic is sent
|
---|
| 648 | * across a non-loopback interface, however. */
|
---|
| 649 | if (ip6_addr_isloopback(ip6_current_dest_addr()) ||
|
---|
| 650 | ip6_addr_isloopback(ip6_current_src_addr())) {
|
---|
| 651 | goto netif_found;
|
---|
| 652 | }
|
---|
| 653 | #endif /* !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF */
|
---|
| 654 | #if !LWIP_SINGLE_NETIF
|
---|
| 655 | NETIF_FOREACH(netif) {
|
---|
| 656 | if (netif == inp) {
|
---|
| 657 | /* we checked that before already */
|
---|
| 658 | continue;
|
---|
| 659 | }
|
---|
| 660 | if (ip6_input_accept(netif)) {
|
---|
| 661 | break;
|
---|
| 662 | }
|
---|
| 663 | }
|
---|
| 664 | #endif /* !LWIP_SINGLE_NETIF */
|
---|
| 665 | }
|
---|
| 666 | netif_found:
|
---|
| 667 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet accepted on interface %c%c\n",
|
---|
| 668 | netif ? netif->name[0] : 'X', netif? netif->name[1] : 'X'));
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | /* "::" packet source address? (used in duplicate address detection) */
|
---|
| 672 | if (ip6_addr_isany(ip6_current_src_addr()) &&
|
---|
| 673 | (!ip6_addr_issolicitednode(ip6_current_dest_addr()))) {
|
---|
| 674 | /* packet source is not valid */
|
---|
| 675 | /* free (drop) packet pbufs */
|
---|
| 676 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with src ANY_ADDRESS dropped\n"));
|
---|
| 677 | pbuf_free(p);
|
---|
| 678 | IP6_STATS_INC(ip6.drop);
|
---|
| 679 | goto ip6_input_cleanup;
|
---|
| 680 | }
|
---|
| 681 |
|
---|
| 682 | /* packet not for us? */
|
---|
| 683 | if (netif == NULL) {
|
---|
| 684 | /* packet not for us, route or discard */
|
---|
| 685 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_TRACE, ("ip6_input: packet not for us.\n"));
|
---|
| 686 | #if LWIP_IPV6_FORWARD
|
---|
| 687 | /* non-multicast packet? */
|
---|
| 688 | if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
|
---|
| 689 | /* try to forward IP packet on (other) interfaces */
|
---|
| 690 | ip6_forward(p, ip6hdr, inp);
|
---|
| 691 | }
|
---|
| 692 | #endif /* LWIP_IPV6_FORWARD */
|
---|
| 693 | pbuf_free(p);
|
---|
| 694 | goto ip6_input_cleanup;
|
---|
| 695 | }
|
---|
| 696 |
|
---|
| 697 | /* current netif pointer. */
|
---|
| 698 | ip_data.current_netif = netif;
|
---|
| 699 |
|
---|
| 700 | /* Save next header type. */
|
---|
| 701 | nexth = &IP6H_NEXTH(ip6hdr);
|
---|
| 702 |
|
---|
| 703 | /* Init header length. */
|
---|
| 704 | hlen = hlen_tot = IP6_HLEN;
|
---|
| 705 |
|
---|
| 706 | /* Move to payload. */
|
---|
| 707 | pbuf_remove_header(p, IP6_HLEN);
|
---|
| 708 |
|
---|
| 709 | /* Process known option extension headers, if present. */
|
---|
| 710 | while (*nexth != IP6_NEXTH_NONE)
|
---|
| 711 | {
|
---|
| 712 | switch (*nexth) {
|
---|
| 713 | case IP6_NEXTH_HOPBYHOP:
|
---|
| 714 | {
|
---|
| 715 | s32_t opt_offset;
|
---|
| 716 | struct ip6_hbh_hdr *hbh_hdr;
|
---|
| 717 | struct ip6_opt_hdr *opt_hdr;
|
---|
| 718 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header\n"));
|
---|
| 719 |
|
---|
| 720 | /* Get and check the header length, while staying in packet bounds. */
|
---|
| 721 | hbh_hdr = (struct ip6_hbh_hdr *)p->payload;
|
---|
| 722 |
|
---|
| 723 | /* Get next header type. */
|
---|
| 724 | nexth = &IP6_HBH_NEXTH(hbh_hdr);
|
---|
| 725 |
|
---|
| 726 | /* Get the header length. */
|
---|
| 727 | hlen = (u16_t)(8 * (1 + hbh_hdr->_hlen));
|
---|
| 728 |
|
---|
| 729 | if ((p->len < 8) || (hlen > p->len)) {
|
---|
| 730 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 731 | ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
---|
| 732 | hlen, p->len));
|
---|
| 733 | /* free (drop) packet pbufs */
|
---|
| 734 | pbuf_free(p);
|
---|
| 735 | IP6_STATS_INC(ip6.lenerr);
|
---|
| 736 | IP6_STATS_INC(ip6.drop);
|
---|
| 737 | goto ip6_input_cleanup;
|
---|
| 738 | }
|
---|
| 739 |
|
---|
| 740 | hlen_tot = (u16_t)(hlen_tot + hlen);
|
---|
| 741 |
|
---|
| 742 | /* The extended option header starts right after Hop-by-Hop header. */
|
---|
| 743 | opt_offset = IP6_HBH_HLEN;
|
---|
| 744 | while (opt_offset < hlen)
|
---|
| 745 | {
|
---|
| 746 | s32_t opt_dlen = 0;
|
---|
| 747 |
|
---|
| 748 | opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + opt_offset);
|
---|
| 749 |
|
---|
| 750 | switch (IP6_OPT_TYPE(opt_hdr)) {
|
---|
| 751 | /* @todo: process IPV6 Hop-by-Hop option data */
|
---|
| 752 | case IP6_PAD1_OPTION:
|
---|
| 753 | /* PAD1 option doesn't have length and value field */
|
---|
| 754 | opt_dlen = -1;
|
---|
| 755 | break;
|
---|
| 756 | case IP6_PADN_OPTION:
|
---|
| 757 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 758 | break;
|
---|
| 759 | case IP6_ROUTER_ALERT_OPTION:
|
---|
| 760 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 761 | break;
|
---|
| 762 | case IP6_JUMBO_OPTION:
|
---|
| 763 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 764 | break;
|
---|
| 765 | default:
|
---|
| 766 | /* Check 2 MSB of Hop-by-Hop header type. */
|
---|
| 767 | switch (IP6_OPT_TYPE_ACTION(opt_hdr)) {
|
---|
| 768 | case 1:
|
---|
| 769 | /* Discard the packet. */
|
---|
| 770 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n"));
|
---|
| 771 | pbuf_free(p);
|
---|
| 772 | IP6_STATS_INC(ip6.drop);
|
---|
| 773 | goto ip6_input_cleanup;
|
---|
| 774 | case 2:
|
---|
| 775 | /* Send ICMP Parameter Problem */
|
---|
| 776 | icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr);
|
---|
| 777 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n"));
|
---|
| 778 | pbuf_free(p);
|
---|
| 779 | IP6_STATS_INC(ip6.drop);
|
---|
| 780 | goto ip6_input_cleanup;
|
---|
| 781 | case 3:
|
---|
| 782 | /* Send ICMP Parameter Problem if destination address is not a multicast address */
|
---|
| 783 | if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
|
---|
| 784 | icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr);
|
---|
| 785 | }
|
---|
| 786 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n"));
|
---|
| 787 | pbuf_free(p);
|
---|
| 788 | IP6_STATS_INC(ip6.drop);
|
---|
| 789 | goto ip6_input_cleanup;
|
---|
| 790 | default:
|
---|
| 791 | /* Skip over this option. */
|
---|
| 792 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 793 | break;
|
---|
| 794 | }
|
---|
| 795 | break;
|
---|
| 796 | }
|
---|
| 797 |
|
---|
| 798 | /* Adjust the offset to move to the next extended option header */
|
---|
| 799 | opt_offset = opt_offset + IP6_OPT_HLEN + opt_dlen;
|
---|
| 800 | }
|
---|
| 801 | pbuf_remove_header(p, hlen);
|
---|
| 802 | break;
|
---|
| 803 | }
|
---|
| 804 | case IP6_NEXTH_DESTOPTS:
|
---|
| 805 | {
|
---|
| 806 | s32_t opt_offset;
|
---|
| 807 | struct ip6_dest_hdr *dest_hdr;
|
---|
| 808 | struct ip6_opt_hdr *opt_hdr;
|
---|
| 809 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Destination options header\n"));
|
---|
| 810 |
|
---|
| 811 | dest_hdr = (struct ip6_dest_hdr *)p->payload;
|
---|
| 812 |
|
---|
| 813 | /* Get next header type. */
|
---|
| 814 | nexth = &IP6_DEST_NEXTH(dest_hdr);
|
---|
| 815 |
|
---|
| 816 | /* Get the header length. */
|
---|
| 817 | hlen = 8 * (1 + dest_hdr->_hlen);
|
---|
| 818 | if ((p->len < 8) || (hlen > p->len)) {
|
---|
| 819 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 820 | ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
---|
| 821 | hlen, p->len));
|
---|
| 822 | /* free (drop) packet pbufs */
|
---|
| 823 | pbuf_free(p);
|
---|
| 824 | IP6_STATS_INC(ip6.lenerr);
|
---|
| 825 | IP6_STATS_INC(ip6.drop);
|
---|
| 826 | goto ip6_input_cleanup;
|
---|
| 827 | }
|
---|
| 828 |
|
---|
| 829 | hlen_tot = (u16_t)(hlen_tot + hlen);
|
---|
| 830 |
|
---|
| 831 | /* The extended option header starts right after Destination header. */
|
---|
| 832 | opt_offset = IP6_DEST_HLEN;
|
---|
| 833 | while (opt_offset < hlen)
|
---|
| 834 | {
|
---|
| 835 | s32_t opt_dlen = 0;
|
---|
| 836 |
|
---|
| 837 | opt_hdr = (struct ip6_opt_hdr *)((u8_t *)dest_hdr + opt_offset);
|
---|
| 838 |
|
---|
| 839 | switch (IP6_OPT_TYPE(opt_hdr))
|
---|
| 840 | {
|
---|
| 841 | /* @todo: process IPV6 Destination option data */
|
---|
| 842 | case IP6_PAD1_OPTION:
|
---|
| 843 | /* PAD1 option deosn't have length and value field */
|
---|
| 844 | opt_dlen = -1;
|
---|
| 845 | break;
|
---|
| 846 | case IP6_PADN_OPTION:
|
---|
| 847 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 848 | break;
|
---|
| 849 | case IP6_ROUTER_ALERT_OPTION:
|
---|
| 850 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 851 | break;
|
---|
| 852 | case IP6_JUMBO_OPTION:
|
---|
| 853 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 854 | break;
|
---|
| 855 | case IP6_HOME_ADDRESS_OPTION:
|
---|
| 856 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 857 | break;
|
---|
| 858 | default:
|
---|
| 859 | /* Check 2 MSB of Destination header type. */
|
---|
| 860 | switch (IP6_OPT_TYPE_ACTION(opt_hdr))
|
---|
| 861 | {
|
---|
| 862 | case 1:
|
---|
| 863 | /* Discard the packet. */
|
---|
| 864 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n"));
|
---|
| 865 | pbuf_free(p);
|
---|
| 866 | IP6_STATS_INC(ip6.drop);
|
---|
| 867 | goto ip6_input_cleanup;
|
---|
| 868 | case 2:
|
---|
| 869 | /* Send ICMP Parameter Problem */
|
---|
| 870 | icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr);
|
---|
| 871 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n"));
|
---|
| 872 | pbuf_free(p);
|
---|
| 873 | IP6_STATS_INC(ip6.drop);
|
---|
| 874 | goto ip6_input_cleanup;
|
---|
| 875 | case 3:
|
---|
| 876 | /* Send ICMP Parameter Problem if destination address is not a multicast address */
|
---|
| 877 | if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
|
---|
| 878 | icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr);
|
---|
| 879 | }
|
---|
| 880 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n"));
|
---|
| 881 | pbuf_free(p);
|
---|
| 882 | IP6_STATS_INC(ip6.drop);
|
---|
| 883 | goto ip6_input_cleanup;
|
---|
| 884 | default:
|
---|
| 885 | /* Skip over this option. */
|
---|
| 886 | opt_dlen = IP6_OPT_DLEN(opt_hdr);
|
---|
| 887 | break;
|
---|
| 888 | }
|
---|
| 889 | break;
|
---|
| 890 | }
|
---|
| 891 |
|
---|
| 892 | /* Adjust the offset to move to the next extended option header */
|
---|
| 893 | opt_offset = opt_offset + IP6_OPT_HLEN + opt_dlen;
|
---|
| 894 | }
|
---|
| 895 |
|
---|
| 896 | pbuf_remove_header(p, hlen);
|
---|
| 897 | break;
|
---|
| 898 | }
|
---|
| 899 | case IP6_NEXTH_ROUTING:
|
---|
| 900 | {
|
---|
| 901 | struct ip6_rout_hdr *rout_hdr;
|
---|
| 902 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Routing header\n"));
|
---|
| 903 |
|
---|
| 904 | rout_hdr = (struct ip6_rout_hdr *)p->payload;
|
---|
| 905 |
|
---|
| 906 | /* Get next header type. */
|
---|
| 907 | nexth = &IP6_ROUT_NEXTH(rout_hdr);
|
---|
| 908 |
|
---|
| 909 | /* Get the header length. */
|
---|
| 910 | hlen = 8 * (1 + rout_hdr->_hlen);
|
---|
| 911 |
|
---|
| 912 | if ((p->len < 8) || (hlen > p->len)) {
|
---|
| 913 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 914 | ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
---|
| 915 | hlen, p->len));
|
---|
| 916 | /* free (drop) packet pbufs */
|
---|
| 917 | pbuf_free(p);
|
---|
| 918 | IP6_STATS_INC(ip6.lenerr);
|
---|
| 919 | IP6_STATS_INC(ip6.drop);
|
---|
| 920 | goto ip6_input_cleanup;
|
---|
| 921 | }
|
---|
| 922 |
|
---|
| 923 | /* Skip over this header. */
|
---|
| 924 | hlen_tot = (u16_t)(hlen_tot + hlen);
|
---|
| 925 |
|
---|
| 926 | /* if segment left value is 0 in routing header, ignore the option */
|
---|
| 927 | if (IP6_ROUT_SEG_LEFT(rout_hdr)) {
|
---|
| 928 | /* The length field of routing option header must be even */
|
---|
| 929 | if (rout_hdr->_hlen & 0x1) {
|
---|
| 930 | /* Discard and send parameter field error */
|
---|
| 931 | icmp6_param_problem(p, ICMP6_PP_FIELD, &rout_hdr->_hlen);
|
---|
| 932 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid routing type dropped\n"));
|
---|
| 933 | pbuf_free(p);
|
---|
| 934 | IP6_STATS_INC(ip6.drop);
|
---|
| 935 | goto ip6_input_cleanup;
|
---|
| 936 | }
|
---|
| 937 |
|
---|
| 938 | switch (IP6_ROUT_TYPE(rout_hdr))
|
---|
| 939 | {
|
---|
| 940 | /* TODO: process routing by the type */
|
---|
| 941 | case IP6_ROUT_TYPE2:
|
---|
| 942 | break;
|
---|
| 943 | case IP6_ROUT_RPL:
|
---|
| 944 | break;
|
---|
| 945 | default:
|
---|
| 946 | /* Discard unrecognized routing type and send parameter field error */
|
---|
| 947 | icmp6_param_problem(p, ICMP6_PP_FIELD, &IP6_ROUT_TYPE(rout_hdr));
|
---|
| 948 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid routing type dropped\n"));
|
---|
| 949 | pbuf_free(p);
|
---|
| 950 | IP6_STATS_INC(ip6.drop);
|
---|
| 951 | goto ip6_input_cleanup;
|
---|
| 952 | }
|
---|
| 953 | }
|
---|
| 954 |
|
---|
| 955 | pbuf_remove_header(p, hlen);
|
---|
| 956 | break;
|
---|
| 957 | }
|
---|
| 958 | case IP6_NEXTH_FRAGMENT:
|
---|
| 959 | {
|
---|
| 960 | struct ip6_frag_hdr *frag_hdr;
|
---|
| 961 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header\n"));
|
---|
| 962 |
|
---|
| 963 | frag_hdr = (struct ip6_frag_hdr *)p->payload;
|
---|
| 964 |
|
---|
| 965 | /* Get next header type. */
|
---|
| 966 | nexth = &IP6_FRAG_NEXTH(frag_hdr);
|
---|
| 967 |
|
---|
| 968 | /* Fragment Header length. */
|
---|
| 969 | hlen = 8;
|
---|
| 970 |
|
---|
| 971 | /* Make sure this header fits in current pbuf. */
|
---|
| 972 | if (hlen > p->len) {
|
---|
| 973 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 974 | ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
---|
| 975 | hlen, p->len));
|
---|
| 976 | /* free (drop) packet pbufs */
|
---|
| 977 | pbuf_free(p);
|
---|
| 978 | IP6_FRAG_STATS_INC(ip6_frag.lenerr);
|
---|
| 979 | IP6_FRAG_STATS_INC(ip6_frag.drop);
|
---|
| 980 | goto ip6_input_cleanup;
|
---|
| 981 | }
|
---|
| 982 |
|
---|
| 983 | hlen_tot = (u16_t)(hlen_tot + hlen);
|
---|
| 984 |
|
---|
| 985 | /* check payload length is multiple of 8 octets when mbit is set */
|
---|
| 986 | if (IP6_FRAG_MBIT(frag_hdr) && (IP6H_PLEN(ip6hdr) & 0x7)) {
|
---|
| 987 | /* ipv6 payload length is not multiple of 8 octets */
|
---|
| 988 | icmp6_param_problem(p, ICMP6_PP_FIELD, LWIP_PACKED_CAST(const void *, &ip6hdr->_plen));
|
---|
| 989 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid payload length dropped\n"));
|
---|
| 990 | pbuf_free(p);
|
---|
| 991 | IP6_STATS_INC(ip6.drop);
|
---|
| 992 | goto ip6_input_cleanup;
|
---|
| 993 | }
|
---|
| 994 |
|
---|
| 995 | /* Offset == 0 and more_fragments == 0? */
|
---|
| 996 | if ((frag_hdr->_fragment_offset &
|
---|
| 997 | PP_HTONS(IP6_FRAG_OFFSET_MASK | IP6_FRAG_MORE_FLAG)) == 0) {
|
---|
| 998 | /* This is a 1-fragment packet. Skip this header and continue. */
|
---|
| 999 | pbuf_remove_header(p, hlen);
|
---|
| 1000 | } else {
|
---|
| 1001 | #if LWIP_IPV6_REASS
|
---|
| 1002 | /* reassemble the packet */
|
---|
| 1003 | ip_data.current_ip_header_tot_len = hlen_tot;
|
---|
| 1004 | p = ip6_reass(p);
|
---|
| 1005 | /* packet not fully reassembled yet? */
|
---|
| 1006 | if (p == NULL) {
|
---|
| 1007 | goto ip6_input_cleanup;
|
---|
| 1008 | }
|
---|
| 1009 |
|
---|
| 1010 | /* Returned p point to IPv6 header.
|
---|
| 1011 | * Update all our variables and pointers and continue. */
|
---|
| 1012 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1013 | nexth = &IP6H_NEXTH(ip6hdr);
|
---|
| 1014 | hlen = hlen_tot = IP6_HLEN;
|
---|
| 1015 | pbuf_remove_header(p, IP6_HLEN);
|
---|
| 1016 |
|
---|
| 1017 | #else /* LWIP_IPV6_REASS */
|
---|
| 1018 | /* free (drop) packet pbufs */
|
---|
| 1019 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header dropped (with LWIP_IPV6_REASS==0)\n"));
|
---|
| 1020 | pbuf_free(p);
|
---|
| 1021 | IP6_STATS_INC(ip6.opterr);
|
---|
| 1022 | IP6_STATS_INC(ip6.drop);
|
---|
| 1023 | goto ip6_input_cleanup;
|
---|
| 1024 | #endif /* LWIP_IPV6_REASS */
|
---|
| 1025 | }
|
---|
| 1026 | break;
|
---|
| 1027 | }
|
---|
| 1028 | default:
|
---|
| 1029 | goto options_done;
|
---|
| 1030 | }
|
---|
| 1031 |
|
---|
| 1032 | if (*nexth == IP6_NEXTH_HOPBYHOP) {
|
---|
| 1033 | /* Hop-by-Hop header comes only as a first option */
|
---|
| 1034 | icmp6_param_problem(p, ICMP6_PP_HEADER, nexth);
|
---|
| 1035 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header dropped (only valid as a first option)\n"));
|
---|
| 1036 | pbuf_free(p);
|
---|
| 1037 | IP6_STATS_INC(ip6.drop);
|
---|
| 1038 | goto ip6_input_cleanup;
|
---|
| 1039 | }
|
---|
| 1040 | }
|
---|
| 1041 |
|
---|
| 1042 | options_done:
|
---|
| 1043 |
|
---|
| 1044 | /* send to upper layers */
|
---|
| 1045 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: \n"));
|
---|
| 1046 | ip6_debug_print(p);
|
---|
| 1047 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
|
---|
| 1048 |
|
---|
| 1049 | ip_data.current_ip_header_tot_len = hlen_tot;
|
---|
| 1050 |
|
---|
| 1051 | #if LWIP_RAW
|
---|
| 1052 | /* p points to IPv6 header again for raw_input. */
|
---|
| 1053 | pbuf_add_header_force(p, hlen_tot);
|
---|
| 1054 | /* raw input did not eat the packet? */
|
---|
| 1055 | raw_status = raw_input(p, inp);
|
---|
| 1056 | if (raw_status != RAW_INPUT_EATEN)
|
---|
| 1057 | {
|
---|
| 1058 | /* Point to payload. */
|
---|
| 1059 | pbuf_remove_header(p, hlen_tot);
|
---|
| 1060 | #else /* LWIP_RAW */
|
---|
| 1061 | {
|
---|
| 1062 | #endif /* LWIP_RAW */
|
---|
| 1063 | switch (*nexth) {
|
---|
| 1064 | case IP6_NEXTH_NONE:
|
---|
| 1065 | pbuf_free(p);
|
---|
| 1066 | break;
|
---|
| 1067 | #if LWIP_UDP
|
---|
| 1068 | case IP6_NEXTH_UDP:
|
---|
| 1069 | #if LWIP_UDPLITE
|
---|
| 1070 | case IP6_NEXTH_UDPLITE:
|
---|
| 1071 | #endif /* LWIP_UDPLITE */
|
---|
| 1072 | udp_input(p, inp);
|
---|
| 1073 | break;
|
---|
| 1074 | #endif /* LWIP_UDP */
|
---|
| 1075 | #if LWIP_TCP
|
---|
| 1076 | case IP6_NEXTH_TCP:
|
---|
| 1077 | tcp_input(p, inp);
|
---|
| 1078 | break;
|
---|
| 1079 | #endif /* LWIP_TCP */
|
---|
| 1080 | #if LWIP_ICMP6
|
---|
| 1081 | case IP6_NEXTH_ICMP6:
|
---|
| 1082 | icmp6_input(p, inp);
|
---|
| 1083 | break;
|
---|
| 1084 | #endif /* LWIP_ICMP */
|
---|
| 1085 | default:
|
---|
| 1086 | #if LWIP_RAW
|
---|
| 1087 | if (raw_status == RAW_INPUT_DELIVERED) {
|
---|
| 1088 | /* @todo: ipv6 mib in-delivers? */
|
---|
| 1089 | } else
|
---|
| 1090 | #endif /* LWIP_RAW */
|
---|
| 1091 | {
|
---|
| 1092 | #if LWIP_ICMP6
|
---|
| 1093 | /* p points to IPv6 header again for raw_input. */
|
---|
| 1094 | pbuf_add_header_force(p, hlen_tot);
|
---|
| 1095 | /* send ICMP parameter problem unless it was a multicast or ICMPv6 */
|
---|
| 1096 | if ((!ip6_addr_ismulticast(ip6_current_dest_addr())) &&
|
---|
| 1097 | (IP6H_NEXTH(ip6hdr) != IP6_NEXTH_ICMP6)) {
|
---|
| 1098 | icmp6_param_problem(p, ICMP6_PP_HEADER, nexth);
|
---|
| 1099 | }
|
---|
| 1100 | #endif /* LWIP_ICMP */
|
---|
| 1101 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_input: Unsupported transport protocol %"U16_F"\n", (u16_t)IP6H_NEXTH(ip6hdr)));
|
---|
| 1102 | IP6_STATS_INC(ip6.proterr);
|
---|
| 1103 | IP6_STATS_INC(ip6.drop);
|
---|
| 1104 | }
|
---|
| 1105 | pbuf_free(p);
|
---|
| 1106 | break;
|
---|
| 1107 | }
|
---|
| 1108 | }
|
---|
| 1109 |
|
---|
| 1110 | ip6_input_cleanup:
|
---|
| 1111 | ip_data.current_netif = NULL;
|
---|
| 1112 | ip_data.current_input_netif = NULL;
|
---|
| 1113 | ip_data.current_ip6_header = NULL;
|
---|
| 1114 | ip_data.current_ip_header_tot_len = 0;
|
---|
| 1115 | ip6_addr_set_zero(ip6_current_src_addr());
|
---|
| 1116 | ip6_addr_set_zero(ip6_current_dest_addr());
|
---|
| 1117 |
|
---|
| 1118 | return ERR_OK;
|
---|
| 1119 | }
|
---|
| 1120 |
|
---|
| 1121 |
|
---|
| 1122 | /**
|
---|
| 1123 | * Sends an IPv6 packet on a network interface. This function constructs
|
---|
| 1124 | * the IPv6 header. If the source IPv6 address is NULL, the IPv6 "ANY" address is
|
---|
| 1125 | * used as source (usually during network startup). If the source IPv6 address it
|
---|
| 1126 | * IP6_ADDR_ANY, the most appropriate IPv6 address of the outgoing network
|
---|
| 1127 | * interface is filled in as source address. If the destination IPv6 address is
|
---|
| 1128 | * LWIP_IP_HDRINCL, p is assumed to already include an IPv6 header and
|
---|
| 1129 | * p->payload points to it instead of the data.
|
---|
| 1130 | *
|
---|
| 1131 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 1132 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 1133 | IPv6 header and p->payload points to that IPv6 header)
|
---|
| 1134 | * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
---|
| 1135 | * IP address of the netif is selected and used as source address.
|
---|
| 1136 | * if src == NULL, IP6_ADDR_ANY is used as source) (src is possibly not
|
---|
| 1137 | * properly zoned)
|
---|
| 1138 | * @param dest the destination IPv6 address to send the packet to (possibly not
|
---|
| 1139 | * properly zoned)
|
---|
| 1140 | * @param hl the Hop Limit value to be set in the IPv6 header
|
---|
| 1141 | * @param tc the Traffic Class value to be set in the IPv6 header
|
---|
| 1142 | * @param nexth the Next Header to be set in the IPv6 header
|
---|
| 1143 | * @param netif the netif on which to send this packet
|
---|
| 1144 | * @return ERR_OK if the packet was sent OK
|
---|
| 1145 | * ERR_BUF if p doesn't have enough space for IPv6/LINK headers
|
---|
| 1146 | * returns errors returned by netif->output_ip6
|
---|
| 1147 | */
|
---|
| 1148 | err_t
|
---|
| 1149 | ip6_output_if(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
|
---|
| 1150 | u8_t hl, u8_t tc,
|
---|
| 1151 | u8_t nexth, struct netif *netif)
|
---|
| 1152 | {
|
---|
| 1153 | const ip6_addr_t *src_used = src;
|
---|
| 1154 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 1155 | if (src != NULL && ip6_addr_isany(src)) {
|
---|
| 1156 | src_used = ip_2_ip6(ip6_select_source_address(netif, dest));
|
---|
| 1157 | if ((src_used == NULL) || ip6_addr_isany(src_used)) {
|
---|
| 1158 | /* No appropriate source address was found for this packet. */
|
---|
| 1159 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: No suitable source address for packet.\n"));
|
---|
| 1160 | IP6_STATS_INC(ip6.rterr);
|
---|
| 1161 | return ERR_RTE;
|
---|
| 1162 | }
|
---|
| 1163 | }
|
---|
| 1164 | }
|
---|
| 1165 | return ip6_output_if_src(p, src_used, dest, hl, tc, nexth, netif);
|
---|
| 1166 | }
|
---|
| 1167 |
|
---|
| 1168 | /**
|
---|
| 1169 | * Same as ip6_output_if() but 'src' address is not replaced by netif address
|
---|
| 1170 | * when it is 'any'.
|
---|
| 1171 | */
|
---|
| 1172 | err_t
|
---|
| 1173 | ip6_output_if_src(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
|
---|
| 1174 | u8_t hl, u8_t tc,
|
---|
| 1175 | u8_t nexth, struct netif *netif)
|
---|
| 1176 | {
|
---|
| 1177 | struct ip6_hdr *ip6hdr;
|
---|
| 1178 | ip6_addr_t dest_addr;
|
---|
| 1179 |
|
---|
| 1180 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 1181 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 1182 |
|
---|
| 1183 | /* Should the IPv6 header be generated or is it already included in p? */
|
---|
| 1184 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 1185 | #if LWIP_IPV6_SCOPES
|
---|
| 1186 | /* If the destination address is scoped but lacks a zone, add a zone now,
|
---|
| 1187 | * based on the outgoing interface. The lower layers (e.g., nd6) absolutely
|
---|
| 1188 | * require addresses to be properly zoned for correctness. In some cases,
|
---|
| 1189 | * earlier attempts will have been made to add a zone to the destination,
|
---|
| 1190 | * but this function is the only one that is called in all (other) cases,
|
---|
| 1191 | * so we must do this here. */
|
---|
| 1192 | if (ip6_addr_lacks_zone(dest, IP6_UNKNOWN)) {
|
---|
| 1193 | ip6_addr_copy(dest_addr, *dest);
|
---|
| 1194 | ip6_addr_assign_zone(&dest_addr, IP6_UNKNOWN, netif);
|
---|
| 1195 | dest = &dest_addr;
|
---|
| 1196 | }
|
---|
| 1197 | #endif /* LWIP_IPV6_SCOPES */
|
---|
| 1198 |
|
---|
| 1199 | /* generate IPv6 header */
|
---|
| 1200 | if (pbuf_add_header(p, IP6_HLEN)) {
|
---|
| 1201 | LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: not enough room for IPv6 header in pbuf\n"));
|
---|
| 1202 | IP6_STATS_INC(ip6.err);
|
---|
| 1203 | return ERR_BUF;
|
---|
| 1204 | }
|
---|
| 1205 |
|
---|
| 1206 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1207 | LWIP_ASSERT("check that first pbuf can hold struct ip6_hdr",
|
---|
| 1208 | (p->len >= sizeof(struct ip6_hdr)));
|
---|
| 1209 |
|
---|
| 1210 | IP6H_HOPLIM_SET(ip6hdr, hl);
|
---|
| 1211 | IP6H_NEXTH_SET(ip6hdr, nexth);
|
---|
| 1212 |
|
---|
| 1213 | /* dest cannot be NULL here */
|
---|
| 1214 | ip6_addr_copy_to_packed(ip6hdr->dest, *dest);
|
---|
| 1215 |
|
---|
| 1216 | IP6H_VTCFL_SET(ip6hdr, 6, tc, 0);
|
---|
| 1217 | IP6H_PLEN_SET(ip6hdr, (u16_t)(p->tot_len - IP6_HLEN));
|
---|
| 1218 |
|
---|
| 1219 | if (src == NULL) {
|
---|
| 1220 | src = IP6_ADDR_ANY6;
|
---|
| 1221 | }
|
---|
| 1222 | /* src cannot be NULL here */
|
---|
| 1223 | ip6_addr_copy_to_packed(ip6hdr->src, *src);
|
---|
| 1224 |
|
---|
| 1225 | } else {
|
---|
| 1226 | /* IP header already included in p */
|
---|
| 1227 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1228 | ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest);
|
---|
| 1229 | ip6_addr_assign_zone(&dest_addr, IP6_UNKNOWN, netif);
|
---|
| 1230 | dest = &dest_addr;
|
---|
| 1231 | }
|
---|
| 1232 |
|
---|
| 1233 | IP6_STATS_INC(ip6.xmit);
|
---|
| 1234 |
|
---|
| 1235 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num));
|
---|
| 1236 | ip6_debug_print(p);
|
---|
| 1237 |
|
---|
| 1238 | #if ENABLE_LOOPBACK
|
---|
| 1239 | {
|
---|
| 1240 | int i;
|
---|
| 1241 | #if !LWIP_HAVE_LOOPIF
|
---|
| 1242 | if (ip6_addr_isloopback(dest)) {
|
---|
| 1243 | return netif_loop_output(netif, p);
|
---|
| 1244 | }
|
---|
| 1245 | #endif /* !LWIP_HAVE_LOOPIF */
|
---|
| 1246 | for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
|
---|
| 1247 | if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
|
---|
| 1248 | ip6_addr_cmp(dest, netif_ip6_addr(netif, i))) {
|
---|
| 1249 | /* Packet to self, enqueue it for loopback */
|
---|
| 1250 | LWIP_DEBUGF(IP6_DEBUG, ("netif_loop_output()\n"));
|
---|
| 1251 | return netif_loop_output(netif, p);
|
---|
| 1252 | }
|
---|
| 1253 | }
|
---|
| 1254 | }
|
---|
| 1255 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
| 1256 | if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
|
---|
| 1257 | netif_loop_output(netif, p);
|
---|
| 1258 | }
|
---|
| 1259 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 1260 | #endif /* ENABLE_LOOPBACK */
|
---|
| 1261 | #if LWIP_IPV6_FRAG
|
---|
| 1262 | /* don't fragment if interface has mtu set to 0 [loopif] */
|
---|
| 1263 | if (netif_mtu6(netif) && (p->tot_len > nd6_get_destination_mtu(dest, netif))) {
|
---|
| 1264 | return ip6_frag(p, netif, dest);
|
---|
| 1265 | }
|
---|
| 1266 | #endif /* LWIP_IPV6_FRAG */
|
---|
| 1267 |
|
---|
| 1268 | LWIP_DEBUGF(IP6_DEBUG, ("netif->output_ip6()\n"));
|
---|
| 1269 | return netif->output_ip6(netif, p, dest);
|
---|
| 1270 | }
|
---|
| 1271 |
|
---|
| 1272 | /**
|
---|
| 1273 | * Simple interface to ip6_output_if. It finds the outgoing network
|
---|
| 1274 | * interface and calls upon ip6_output_if to do the actual work.
|
---|
| 1275 | *
|
---|
| 1276 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 1277 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 1278 | IPv6 header and p->payload points to that IPv6 header)
|
---|
| 1279 | * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
---|
| 1280 | * IP address of the netif is selected and used as source address.
|
---|
| 1281 | * if src == NULL, IP6_ADDR_ANY is used as source)
|
---|
| 1282 | * @param dest the destination IPv6 address to send the packet to
|
---|
| 1283 | * @param hl the Hop Limit value to be set in the IPv6 header
|
---|
| 1284 | * @param tc the Traffic Class value to be set in the IPv6 header
|
---|
| 1285 | * @param nexth the Next Header to be set in the IPv6 header
|
---|
| 1286 | *
|
---|
| 1287 | * @return ERR_RTE if no route is found
|
---|
| 1288 | * see ip_output_if() for more return values
|
---|
| 1289 | */
|
---|
| 1290 | err_t
|
---|
| 1291 | ip6_output(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
|
---|
| 1292 | u8_t hl, u8_t tc, u8_t nexth)
|
---|
| 1293 | {
|
---|
| 1294 | struct netif *netif;
|
---|
| 1295 | struct ip6_hdr *ip6hdr;
|
---|
| 1296 | ip6_addr_t src_addr, dest_addr;
|
---|
| 1297 |
|
---|
| 1298 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 1299 |
|
---|
| 1300 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 1301 | netif = ip6_route(src, dest);
|
---|
| 1302 | } else {
|
---|
| 1303 | /* IP header included in p, read addresses. */
|
---|
| 1304 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1305 | ip6_addr_copy_from_packed(src_addr, ip6hdr->src);
|
---|
| 1306 | ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest);
|
---|
| 1307 | netif = ip6_route(&src_addr, &dest_addr);
|
---|
| 1308 | }
|
---|
| 1309 |
|
---|
| 1310 | if (netif == NULL) {
|
---|
| 1311 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
|
---|
| 1312 | IP6_ADDR_BLOCK1(dest),
|
---|
| 1313 | IP6_ADDR_BLOCK2(dest),
|
---|
| 1314 | IP6_ADDR_BLOCK3(dest),
|
---|
| 1315 | IP6_ADDR_BLOCK4(dest),
|
---|
| 1316 | IP6_ADDR_BLOCK5(dest),
|
---|
| 1317 | IP6_ADDR_BLOCK6(dest),
|
---|
| 1318 | IP6_ADDR_BLOCK7(dest),
|
---|
| 1319 | IP6_ADDR_BLOCK8(dest)));
|
---|
| 1320 | IP6_STATS_INC(ip6.rterr);
|
---|
| 1321 | return ERR_RTE;
|
---|
| 1322 | }
|
---|
| 1323 |
|
---|
| 1324 | return ip6_output_if(p, src, dest, hl, tc, nexth, netif);
|
---|
| 1325 | }
|
---|
| 1326 |
|
---|
| 1327 |
|
---|
| 1328 | #if LWIP_NETIF_USE_HINTS
|
---|
| 1329 | /** Like ip6_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
|
---|
| 1330 | * before calling ip6_output_if.
|
---|
| 1331 | *
|
---|
| 1332 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 1333 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 1334 | IPv6 header and p->payload points to that IPv6 header)
|
---|
| 1335 | * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
---|
| 1336 | * IP address of the netif is selected and used as source address.
|
---|
| 1337 | * if src == NULL, IP6_ADDR_ANY is used as source)
|
---|
| 1338 | * @param dest the destination IPv6 address to send the packet to
|
---|
| 1339 | * @param hl the Hop Limit value to be set in the IPv6 header
|
---|
| 1340 | * @param tc the Traffic Class value to be set in the IPv6 header
|
---|
| 1341 | * @param nexth the Next Header to be set in the IPv6 header
|
---|
| 1342 | * @param netif_hint netif output hint pointer set to netif->hint before
|
---|
| 1343 | * calling ip_output_if()
|
---|
| 1344 | *
|
---|
| 1345 | * @return ERR_RTE if no route is found
|
---|
| 1346 | * see ip_output_if() for more return values
|
---|
| 1347 | */
|
---|
| 1348 | err_t
|
---|
| 1349 | ip6_output_hinted(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest,
|
---|
| 1350 | u8_t hl, u8_t tc, u8_t nexth, struct netif_hint *netif_hint)
|
---|
| 1351 | {
|
---|
| 1352 | struct netif *netif;
|
---|
| 1353 | struct ip6_hdr *ip6hdr;
|
---|
| 1354 | ip6_addr_t src_addr, dest_addr;
|
---|
| 1355 | err_t err;
|
---|
| 1356 |
|
---|
| 1357 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 1358 |
|
---|
| 1359 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 1360 | netif = ip6_route(src, dest);
|
---|
| 1361 | } else {
|
---|
| 1362 | /* IP header included in p, read addresses. */
|
---|
| 1363 | ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1364 | ip6_addr_copy_from_packed(src_addr, ip6hdr->src);
|
---|
| 1365 | ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest);
|
---|
| 1366 | netif = ip6_route(&src_addr, &dest_addr);
|
---|
| 1367 | }
|
---|
| 1368 |
|
---|
| 1369 | if (netif == NULL) {
|
---|
| 1370 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
|
---|
| 1371 | IP6_ADDR_BLOCK1(dest),
|
---|
| 1372 | IP6_ADDR_BLOCK2(dest),
|
---|
| 1373 | IP6_ADDR_BLOCK3(dest),
|
---|
| 1374 | IP6_ADDR_BLOCK4(dest),
|
---|
| 1375 | IP6_ADDR_BLOCK5(dest),
|
---|
| 1376 | IP6_ADDR_BLOCK6(dest),
|
---|
| 1377 | IP6_ADDR_BLOCK7(dest),
|
---|
| 1378 | IP6_ADDR_BLOCK8(dest)));
|
---|
| 1379 | IP6_STATS_INC(ip6.rterr);
|
---|
| 1380 | return ERR_RTE;
|
---|
| 1381 | }
|
---|
| 1382 |
|
---|
| 1383 | NETIF_SET_HINTS(netif, netif_hint);
|
---|
| 1384 | err = ip6_output_if(p, src, dest, hl, tc, nexth, netif);
|
---|
| 1385 | NETIF_RESET_HINTS(netif);
|
---|
| 1386 |
|
---|
| 1387 | return err;
|
---|
| 1388 | }
|
---|
| 1389 | #endif /* LWIP_NETIF_USE_HINTS*/
|
---|
| 1390 |
|
---|
| 1391 | #if LWIP_IPV6_MLD
|
---|
| 1392 | /**
|
---|
| 1393 | * Add a hop-by-hop options header with a router alert option and padding.
|
---|
| 1394 | *
|
---|
| 1395 | * Used by MLD when sending a Multicast listener report/done message.
|
---|
| 1396 | *
|
---|
| 1397 | * @param p the packet to which we will prepend the options header
|
---|
| 1398 | * @param nexth the next header protocol number (e.g. IP6_NEXTH_ICMP6)
|
---|
| 1399 | * @param value the value of the router alert option data (e.g. IP6_ROUTER_ALERT_VALUE_MLD)
|
---|
| 1400 | * @return ERR_OK if hop-by-hop header was added, ERR_* otherwise
|
---|
| 1401 | */
|
---|
| 1402 | err_t
|
---|
| 1403 | ip6_options_add_hbh_ra(struct pbuf *p, u8_t nexth, u8_t value)
|
---|
| 1404 | {
|
---|
| 1405 | u8_t *opt_data;
|
---|
| 1406 | u32_t offset = 0;
|
---|
| 1407 | struct ip6_hbh_hdr *hbh_hdr;
|
---|
| 1408 | struct ip6_opt_hdr *opt_hdr;
|
---|
| 1409 |
|
---|
| 1410 | /* fixed 4 bytes for router alert option and 2 bytes padding */
|
---|
| 1411 | const u8_t hlen = (sizeof(struct ip6_opt_hdr) * 2) + IP6_ROUTER_ALERT_DLEN;
|
---|
| 1412 | /* Move pointer to make room for hop-by-hop options header. */
|
---|
| 1413 | if (pbuf_add_header(p, sizeof(struct ip6_hbh_hdr) + hlen)) {
|
---|
| 1414 | LWIP_DEBUGF(IP6_DEBUG, ("ip6_options: no space for options header\n"));
|
---|
| 1415 | IP6_STATS_INC(ip6.err);
|
---|
| 1416 | return ERR_BUF;
|
---|
| 1417 | }
|
---|
| 1418 |
|
---|
| 1419 | /* Set fields of Hop-by-Hop header */
|
---|
| 1420 | hbh_hdr = (struct ip6_hbh_hdr *)p->payload;
|
---|
| 1421 | IP6_HBH_NEXTH(hbh_hdr) = nexth;
|
---|
| 1422 | hbh_hdr->_hlen = 0;
|
---|
| 1423 | offset = IP6_HBH_HLEN;
|
---|
| 1424 |
|
---|
| 1425 | /* Set router alert options to Hop-by-Hop extended option header */
|
---|
| 1426 | opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + offset);
|
---|
| 1427 | IP6_OPT_TYPE(opt_hdr) = IP6_ROUTER_ALERT_OPTION;
|
---|
| 1428 | IP6_OPT_DLEN(opt_hdr) = IP6_ROUTER_ALERT_DLEN;
|
---|
| 1429 | offset += IP6_OPT_HLEN;
|
---|
| 1430 |
|
---|
| 1431 | /* Set router alert option data */
|
---|
| 1432 | opt_data = (u8_t *)hbh_hdr + offset;
|
---|
| 1433 | opt_data[0] = value;
|
---|
| 1434 | opt_data[1] = 0;
|
---|
| 1435 | offset += IP6_OPT_DLEN(opt_hdr);
|
---|
| 1436 |
|
---|
| 1437 | /* add 2 bytes padding to make 8 bytes Hop-by-Hop header length */
|
---|
| 1438 | opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + offset);
|
---|
| 1439 | IP6_OPT_TYPE(opt_hdr) = IP6_PADN_OPTION;
|
---|
| 1440 | IP6_OPT_DLEN(opt_hdr) = 0;
|
---|
| 1441 |
|
---|
| 1442 | return ERR_OK;
|
---|
| 1443 | }
|
---|
| 1444 | #endif /* LWIP_IPV6_MLD */
|
---|
| 1445 |
|
---|
| 1446 | #if IP6_DEBUG
|
---|
| 1447 | /* Print an IPv6 header by using LWIP_DEBUGF
|
---|
| 1448 | * @param p an IPv6 packet, p->payload pointing to the IPv6 header
|
---|
| 1449 | */
|
---|
| 1450 | void
|
---|
| 1451 | ip6_debug_print(struct pbuf *p)
|
---|
| 1452 | {
|
---|
| 1453 | struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
|
---|
| 1454 |
|
---|
| 1455 | LWIP_DEBUGF(IP6_DEBUG, ("IPv6 header:\n"));
|
---|
| 1456 | LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1457 | LWIP_DEBUGF(IP6_DEBUG, ("| %2"U16_F" | %3"U16_F" | %7"U32_F" | (ver, class, flow)\n",
|
---|
| 1458 | IP6H_V(ip6hdr),
|
---|
| 1459 | IP6H_TC(ip6hdr),
|
---|
| 1460 | IP6H_FL(ip6hdr)));
|
---|
| 1461 | LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1462 | LWIP_DEBUGF(IP6_DEBUG, ("| %5"U16_F" | %3"U16_F" | %3"U16_F" | (plen, nexth, hopl)\n",
|
---|
| 1463 | IP6H_PLEN(ip6hdr),
|
---|
| 1464 | IP6H_NEXTH(ip6hdr),
|
---|
| 1465 | IP6H_HOPLIM(ip6hdr)));
|
---|
| 1466 | LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1467 | LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (src)\n",
|
---|
| 1468 | IP6_ADDR_BLOCK1(&(ip6hdr->src)),
|
---|
| 1469 | IP6_ADDR_BLOCK2(&(ip6hdr->src)),
|
---|
| 1470 | IP6_ADDR_BLOCK3(&(ip6hdr->src)),
|
---|
| 1471 | IP6_ADDR_BLOCK4(&(ip6hdr->src))));
|
---|
| 1472 | LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
|
---|
| 1473 | IP6_ADDR_BLOCK5(&(ip6hdr->src)),
|
---|
| 1474 | IP6_ADDR_BLOCK6(&(ip6hdr->src)),
|
---|
| 1475 | IP6_ADDR_BLOCK7(&(ip6hdr->src)),
|
---|
| 1476 | IP6_ADDR_BLOCK8(&(ip6hdr->src))));
|
---|
| 1477 | LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1478 | LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (dest)\n",
|
---|
| 1479 | IP6_ADDR_BLOCK1(&(ip6hdr->dest)),
|
---|
| 1480 | IP6_ADDR_BLOCK2(&(ip6hdr->dest)),
|
---|
| 1481 | IP6_ADDR_BLOCK3(&(ip6hdr->dest)),
|
---|
| 1482 | IP6_ADDR_BLOCK4(&(ip6hdr->dest))));
|
---|
| 1483 | LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
|
---|
| 1484 | IP6_ADDR_BLOCK5(&(ip6hdr->dest)),
|
---|
| 1485 | IP6_ADDR_BLOCK6(&(ip6hdr->dest)),
|
---|
| 1486 | IP6_ADDR_BLOCK7(&(ip6hdr->dest)),
|
---|
| 1487 | IP6_ADDR_BLOCK8(&(ip6hdr->dest))));
|
---|
| 1488 | LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1489 | }
|
---|
| 1490 | #endif /* IP6_DEBUG */
|
---|
| 1491 |
|
---|
| 1492 | #endif /* LWIP_IPV6 */
|
---|