commit a4a41b9023ef5b3a7c4a1cd82fb167fc63e706df Author: goldsimon <goldsimon@gmx.de> Date: Wed Sep 26 21:50:42 2012 +0200 - This also brings in LwIP's IPv6 codebase Signed-off-by: Tomas Hruby <tom@minix3.org>
1028 lines
35 KiB
C
1028 lines
35 KiB
C
/**
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* @file
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*
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* IPv6 layer.
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*/
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/*
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* Copyright (c) 2010 Inico Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Ivan Delamer <delamer@inicotech.com>
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*
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*
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* Please coordinate changes and requests with Ivan Delamer
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* <delamer@inicotech.com>
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*/
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#include "lwip/opt.h"
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#if LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/netif.h"
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#include "lwip/ip6.h"
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#include "lwip/ip6_addr.h"
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#include "lwip/ip6_frag.h"
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#include "lwip/icmp6.h"
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#include "lwip/raw.h"
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#include "lwip/udp.h"
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#include "lwip/tcp_impl.h"
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#include "lwip/dhcp6.h"
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#include "lwip/nd6.h"
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#include "lwip/mld6.h"
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#include "lwip/debug.h"
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#include "lwip/stats.h"
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/**
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* Finds the appropriate network interface for a given IPv6 address. It tries to select
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* a netif following a sequence of heuristics:
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* 1) if there is only 1 netif, return it
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* 2) if the destination is a link-local address, try to match the src address to a netif.
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* this is a tricky case because with multiple netifs, link-local addresses only have
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* meaning within a particular subnet/link.
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* 3) tries to match the destination subnet to a configured address
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* 4) tries to find a router
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* 5) tries to match the source address to the netif
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* 6) returns the default netif, if configured
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*
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* @param src the source IPv6 address, if known
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* @param dest the destination IPv6 address for which to find the route
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* @return the netif on which to send to reach dest
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*/
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struct netif *
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ip6_route(struct ip6_addr *src, struct ip6_addr *dest)
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{
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struct netif *netif;
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s8_t i;
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/* If single netif configuration, fast return. */
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if ((netif_list != NULL) && (netif_list->next == NULL)) {
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return netif_list;
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}
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/* Special processing for link-local addresses. */
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if (ip6_addr_islinklocal(dest)) {
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if (ip6_addr_isany(src)) {
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/* Use default netif. */
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return netif_default;
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}
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/* Try to find the netif for the source address. */
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_cmp(src, netif_ip6_addr(netif, i))) {
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return netif;
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}
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}
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}
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/* netif not found, use default netif */
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return netif_default;
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}
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/* See if the destination subnet matches a configured address. */
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
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return netif;
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}
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}
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}
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/* Get the netif for a suitable router. */
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i = nd6_select_router(dest, NULL);
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if (i >= 0) {
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if (default_router_list[i].neighbor_entry != NULL) {
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if (default_router_list[i].neighbor_entry->netif != NULL) {
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return default_router_list[i].neighbor_entry->netif;
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}
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}
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}
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/* try with the netif that matches the source address. */
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if (!ip6_addr_isany(src)) {
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_cmp(src, netif_ip6_addr(netif, i))) {
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return netif;
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}
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}
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}
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}
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/* no matching netif found, use default netif */
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return netif_default;
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}
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/**
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* Select the best IPv6 source address for a given destination
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* IPv6 address. Loosely follows RFC 3484. "Strong host" behavior
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* is assumed.
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*
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* @param netif the netif on which to send a packet
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* @param dest the destination we are trying to reach
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* @return the most suitable source address to use, or NULL if no suitable
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* source address is found
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*/
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ip6_addr_t *
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ip6_select_source_address(struct netif *netif, ip6_addr_t * dest)
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{
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ip6_addr_t * src = NULL;
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u8_t i;
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/* If dest is link-local, choose a link-local source. */
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if (ip6_addr_islinklocal(dest) || ip6_addr_ismulticast_linklocal(dest) || ip6_addr_ismulticast_iflocal(dest)) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_islinklocal(netif_ip6_addr(netif, i))) {
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return netif_ip6_addr(netif, i);
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}
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}
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}
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/* Choose a site-local with matching prefix. */
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if (ip6_addr_issitelocal(dest) || ip6_addr_ismulticast_sitelocal(dest)) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_issitelocal(netif_ip6_addr(netif, i)) &&
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ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
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return netif_ip6_addr(netif, i);
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}
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}
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}
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/* Choose a unique-local with matching prefix. */
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if (ip6_addr_isuniquelocal(dest) || ip6_addr_ismulticast_orglocal(dest)) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_isuniquelocal(netif_ip6_addr(netif, i)) &&
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ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
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return netif_ip6_addr(netif, i);
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}
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}
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}
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/* Choose a global with best matching prefix. */
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if (ip6_addr_isglobal(dest) || ip6_addr_ismulticast_global(dest)) {
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_isglobal(netif_ip6_addr(netif, i))) {
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if (src == NULL) {
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src = netif_ip6_addr(netif, i);
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}
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else {
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/* Replace src only if we find a prefix match. */
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/* TODO find longest matching prefix. */
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if ((!(ip6_addr_netcmp(src, dest))) &&
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ip6_addr_netcmp(netif_ip6_addr(netif, i), dest)) {
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src = netif_ip6_addr(netif, i);
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}
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}
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}
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}
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if (src != NULL) {
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return src;
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}
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}
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/* Last resort: see if arbitrary prefix matches. */
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
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ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
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return netif_ip6_addr(netif, i);
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}
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}
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return NULL;
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}
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#if LWIP_IPV6_FORWARD
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/**
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* Forwards an IPv6 packet. It finds an appropriate route for the
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* packet, decrements the HL value of the packet, and outputs
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* the packet on the appropriate interface.
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*
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* @param p the packet to forward (p->payload points to IP header)
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* @param iphdr the IPv6 header of the input packet
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* @param inp the netif on which this packet was received
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*/
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static void
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ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp)
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{
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struct netif *netif;
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/* do not forward link-local addresses */
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if (ip6_addr_islinklocal(ip6_current_dest_addr())) {
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LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding link-local address.\n"));
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IP6_STATS_INC(ip6.rterr);
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IP6_STATS_INC(ip6.drop);
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return;
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}
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/* Find network interface where to forward this IP packet to. */
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netif = ip6_route(IP6_ADDR_ANY, ip6_current_dest_addr());
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if (netif == NULL) {
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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",
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IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
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#if LWIP_ICMP6
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/* Don't send ICMP messages in response to ICMP messages */
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if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
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icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE);
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}
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#endif /* LWIP_ICMP6 */
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IP6_STATS_INC(ip6.rterr);
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IP6_STATS_INC(ip6.drop);
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return;
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}
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/* Do not forward packets onto the same network interface on which
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* they arrived. */
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if (netif == inp) {
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LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not bouncing packets back on incoming interface.\n"));
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IP6_STATS_INC(ip6.rterr);
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IP6_STATS_INC(ip6.drop);
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return;
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}
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/* decrement HL */
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IP6H_HOPLIM_SET(iphdr, IP6H_HOPLIM(iphdr) - 1);
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/* send ICMP6 if HL == 0 */
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if (IP6H_HOPLIM(iphdr) == 0) {
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#if LWIP_ICMP6
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/* Don't send ICMP messages in response to ICMP messages */
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if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
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icmp6_time_exceeded(p, ICMP6_TE_HL);
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}
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#endif /* LWIP_ICMP6 */
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IP6_STATS_INC(ip6.drop);
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return;
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}
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if (netif->mtu && (p->tot_len > netif->mtu)) {
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#if LWIP_ICMP6
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/* Don't send ICMP messages in response to ICMP messages */
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if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
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icmp6_packet_too_big(p, netif->mtu);
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}
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#endif /* LWIP_ICMP6 */
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IP6_STATS_INC(ip6.drop);
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return;
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}
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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",
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IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
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IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
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/* transmit pbuf on chosen interface */
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netif->output_ip6(netif, p, ip6_current_dest_addr());
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IP6_STATS_INC(ip6.fw);
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IP6_STATS_INC(ip6.xmit);
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return;
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}
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#endif /* LWIP_IPV6_FORWARD */
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/**
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* This function is called by the network interface device driver when
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* an IPv6 packet is received. The function does the basic checks of the
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* IP header such as packet size being at least larger than the header
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* size etc. If the packet was not destined for us, the packet is
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* forwarded (using ip6_forward).
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*
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* Finally, the packet is sent to the upper layer protocol input function.
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*
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* @param p the received IPv6 packet (p->payload points to IPv6 header)
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* @param inp the netif on which this packet was received
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* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
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* processed, but currently always returns ERR_OK)
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*/
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err_t
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ip6_input(struct pbuf *p, struct netif *inp)
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{
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struct ip6_hdr *ip6hdr;
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struct netif *netif;
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u8_t nexth;
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u16_t hlen; /* the current header length */
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u8_t i;
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#if 0 /*IP_ACCEPT_LINK_LAYER_ADDRESSING*/
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@todo
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int check_ip_src=1;
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#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
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IP6_STATS_INC(ip6.recv);
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/* identify the IP header */
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ip6hdr = (struct ip6_hdr *)p->payload;
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if (IP6H_V(ip6hdr) != 6) {
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LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IPv6 packet dropped due to bad version number %"U16_F"\n",
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IP6H_V(ip6hdr)));
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pbuf_free(p);
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IP6_STATS_INC(ip6.err);
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IP6_STATS_INC(ip6.drop);
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return ERR_OK;
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}
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/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
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if ((IP6_HLEN > p->len) || ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len)) {
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if (IP6_HLEN > p->len) {
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LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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("IPv6 header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
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IP6_HLEN, p->len));
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}
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if ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len) {
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LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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("IPv6 (plen %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
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IP6H_PLEN(ip6hdr) + IP6_HLEN, p->tot_len));
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}
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/* free (drop) packet pbufs */
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pbuf_free(p);
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IP6_STATS_INC(ip6.lenerr);
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IP6_STATS_INC(ip6.drop);
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return ERR_OK;
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}
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/* Trim pbuf. This should have been done at the netif layer,
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* but we'll do it anyway just to be sure that its done. */
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pbuf_realloc(p, IP6_HLEN + IP6H_PLEN(ip6hdr));
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/* copy IP addresses to aligned ip6_addr_t */
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ip6_addr_copy(ip_data.current_iphdr_dest.ip6, ip6hdr->dest);
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ip6_addr_copy(ip_data.current_iphdr_src.ip6, ip6hdr->src);
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/* current header pointer. */
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ip_data.current_ip6_header = ip6hdr;
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/* In netif, used in case we need to send ICMPv6 packets back. */
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ip_data.current_netif = inp;
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/* match packet against an interface, i.e. is this packet for us? */
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if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
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/* Always joined to multicast if-local and link-local all-nodes group. */
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if (ip6_addr_isallnodes_iflocal(ip6_current_dest_addr()) ||
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ip6_addr_isallnodes_linklocal(ip6_current_dest_addr())) {
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netif = inp;
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}
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#if LWIP_IPV6_MLD
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else if (mld6_lookfor_group(inp, ip6_current_dest_addr())) {
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netif = inp;
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}
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#else /* LWIP_IPV6_MLD */
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else if (ip6_addr_issolicitednode(ip6_current_dest_addr())) {
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/* Filter solicited node packets when MLD is not enabled
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* (for Neighbor discovery). */
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netif = NULL;
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for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
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if (ip6_addr_isvalid(netif_ip6_addr_state(inp, i)) &&
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ip6_addr_cmp_solicitednode(ip6_current_dest_addr(), netif_ip6_addr(inp, i))) {
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netif = inp;
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LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: solicited node packet accepted on interface %c%c\n",
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netif->name[0], netif->name[1]));
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break;
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}
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}
|
|
}
|
|
#endif /* LWIP_IPV6_MLD */
|
|
else {
|
|
netif = NULL;
|
|
}
|
|
}
|
|
else {
|
|
/* start trying with inp. if that's not acceptable, start walking the
|
|
list of configured netifs.
|
|
'first' is used as a boolean to mark whether we started walking the list */
|
|
int first = 1;
|
|
netif = inp;
|
|
do {
|
|
/* interface is up? */
|
|
if (netif_is_up(netif)) {
|
|
/* unicast to this interface address? address configured? */
|
|
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
|
|
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
|
|
ip6_addr_cmp(ip6_current_dest_addr(), netif_ip6_addr(netif, i))) {
|
|
/* exit outer loop */
|
|
goto netif_found;
|
|
}
|
|
}
|
|
}
|
|
if (ip6_addr_islinklocal(ip6_current_dest_addr())) {
|
|
/* Do not match link-local addresses to other netifs. */
|
|
netif = NULL;
|
|
break;
|
|
}
|
|
if (first) {
|
|
first = 0;
|
|
netif = netif_list;
|
|
} else {
|
|
netif = netif->next;
|
|
}
|
|
if (netif == inp) {
|
|
netif = netif->next;
|
|
}
|
|
} while(netif != NULL);
|
|
netif_found:
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet accepted on interface %c%c\n",
|
|
netif ? netif->name[0] : 'X', netif? netif->name[1] : 'X'));
|
|
}
|
|
|
|
/* "::" packet source address? (used in duplicate address detection) */
|
|
if (ip6_addr_isany(ip6_current_src_addr()) &&
|
|
(!ip6_addr_issolicitednode(ip6_current_dest_addr()))) {
|
|
/* packet source is not valid */
|
|
/* free (drop) packet pbufs */
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with src ANY_ADDRESS dropped\n"));
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.drop);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
/* packet not for us? */
|
|
if (netif == NULL) {
|
|
/* packet not for us, route or discard */
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_TRACE, ("ip6_input: packet not for us.\n"));
|
|
#if LWIP_IPV6_FORWARD
|
|
/* non-multicast packet? */
|
|
if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
|
|
/* try to forward IP packet on (other) interfaces */
|
|
ip6_forward(p, ip6hdr, inp);
|
|
}
|
|
#endif /* LWIP_IPV6_FORWARD */
|
|
pbuf_free(p);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
/* current netif pointer. */
|
|
ip_data.current_netif = netif;
|
|
|
|
/* Save next header type. */
|
|
nexth = IP6H_NEXTH(ip6hdr);
|
|
|
|
/* Init header length. */
|
|
hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
|
|
|
|
/* Move to payload. */
|
|
pbuf_header(p, -IP6_HLEN);
|
|
|
|
/* Process known option extension headers, if present. */
|
|
while (nexth != IP6_NEXTH_NONE)
|
|
{
|
|
switch (nexth) {
|
|
case IP6_NEXTH_HOPBYHOP:
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header\n"));
|
|
/* Get next header type. */
|
|
nexth = *((u8_t *)p->payload);
|
|
|
|
/* Get the header length. */
|
|
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
|
|
ip_data.current_ip_header_tot_len += hlen;
|
|
|
|
/* Skip over this header. */
|
|
if (hlen > p->len) {
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
|
hlen, p->len));
|
|
/* free (drop) packet pbufs */
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.lenerr);
|
|
IP6_STATS_INC(ip6.drop);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
pbuf_header(p, -hlen);
|
|
break;
|
|
case IP6_NEXTH_DESTOPTS:
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Destination options header\n"));
|
|
/* Get next header type. */
|
|
nexth = *((u8_t *)p->payload);
|
|
|
|
/* Get the header length. */
|
|
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
|
|
ip_data.current_ip_header_tot_len += hlen;
|
|
|
|
/* Skip over this header. */
|
|
if (hlen > p->len) {
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
|
hlen, p->len));
|
|
/* free (drop) packet pbufs */
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.lenerr);
|
|
IP6_STATS_INC(ip6.drop);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
pbuf_header(p, -hlen);
|
|
break;
|
|
case IP6_NEXTH_ROUTING:
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Routing header\n"));
|
|
/* Get next header type. */
|
|
nexth = *((u8_t *)p->payload);
|
|
|
|
/* Get the header length. */
|
|
hlen = 8 * (1 + *((u8_t *)p->payload + 1));
|
|
ip_data.current_ip_header_tot_len += hlen;
|
|
|
|
/* Skip over this header. */
|
|
if (hlen > p->len) {
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
|
hlen, p->len));
|
|
/* free (drop) packet pbufs */
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.lenerr);
|
|
IP6_STATS_INC(ip6.drop);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
pbuf_header(p, -hlen);
|
|
break;
|
|
|
|
case IP6_NEXTH_FRAGMENT:
|
|
{
|
|
struct ip6_frag_hdr * frag_hdr;
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header\n"));
|
|
|
|
frag_hdr = (struct ip6_frag_hdr *)p->payload;
|
|
|
|
/* Get next header type. */
|
|
nexth = frag_hdr->_nexth;
|
|
|
|
/* Fragment Header length. */
|
|
hlen = 8;
|
|
ip_data.current_ip_header_tot_len += hlen;
|
|
|
|
/* Make sure this header fits in current pbuf. */
|
|
if (hlen > p->len) {
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
|
|
hlen, p->len));
|
|
/* free (drop) packet pbufs */
|
|
pbuf_free(p);
|
|
IP6_FRAG_STATS_INC(ip6_frag.lenerr);
|
|
IP6_FRAG_STATS_INC(ip6_frag.drop);
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
/* Offset == 0 and more_fragments == 0? */
|
|
if (((frag_hdr->_fragment_offset & IP6_FRAG_OFFSET_MASK) == 0) &&
|
|
((frag_hdr->_fragment_offset & IP6_FRAG_MORE_FLAG) == 0)) {
|
|
|
|
/* This is a 1-fragment packet, usually a packet that we have
|
|
* already reassembled. Skip this header anc continue. */
|
|
pbuf_header(p, -hlen);
|
|
}
|
|
else {
|
|
#if LWIP_IPV6_REASS
|
|
|
|
/* reassemble the packet */
|
|
p = ip6_reass(p);
|
|
/* packet not fully reassembled yet? */
|
|
if (p == NULL) {
|
|
goto ip6_input_cleanup;
|
|
}
|
|
|
|
/* Returned p point to IPv6 header.
|
|
* Update all our variables and pointers and continue. */
|
|
ip6hdr = (struct ip6_hdr *)p->payload;
|
|
nexth = IP6H_NEXTH(ip6hdr);
|
|
hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
|
|
pbuf_header(p, -IP6_HLEN);
|
|
|
|
#else /* LWIP_IPV6_REASS */
|
|
/* free (drop) packet pbufs */
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header dropped (with LWIP_IPV6_REASS==0)\n"));
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.opterr);
|
|
IP6_STATS_INC(ip6.drop);
|
|
goto ip6_input_cleanup;
|
|
#endif /* LWIP_IPV6_REASS */
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
goto options_done;
|
|
break;
|
|
}
|
|
}
|
|
options_done:
|
|
|
|
/* p points to IPv6 header again. */
|
|
pbuf_header(p, ip_data.current_ip_header_tot_len);
|
|
|
|
/* send to upper layers */
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: \n"));
|
|
ip6_debug_print(p);
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
|
|
|
|
#if LWIP_RAW
|
|
/* raw input did not eat the packet? */
|
|
if (raw_input(p, inp) == 0)
|
|
#endif /* LWIP_RAW */
|
|
{
|
|
switch (nexth) {
|
|
case IP6_NEXTH_NONE:
|
|
pbuf_free(p);
|
|
break;
|
|
#if LWIP_UDP
|
|
case IP6_NEXTH_UDP:
|
|
#if LWIP_UDPLITE
|
|
case IP6_NEXTH_UDPLITE:
|
|
#endif /* LWIP_UDPLITE */
|
|
/* Point to payload. */
|
|
pbuf_header(p, -ip_data.current_ip_header_tot_len);
|
|
udp_input(p, inp);
|
|
break;
|
|
#endif /* LWIP_UDP */
|
|
#if LWIP_TCP
|
|
case IP6_NEXTH_TCP:
|
|
/* Point to payload. */
|
|
pbuf_header(p, -ip_data.current_ip_header_tot_len);
|
|
tcp_input(p, inp);
|
|
break;
|
|
#endif /* LWIP_TCP */
|
|
#if LWIP_ICMP6
|
|
case IP6_NEXTH_ICMP6:
|
|
/* Point to payload. */
|
|
pbuf_header(p, -ip_data.current_ip_header_tot_len);
|
|
icmp6_input(p, inp);
|
|
break;
|
|
#endif /* LWIP_ICMP */
|
|
default:
|
|
#if LWIP_ICMP6
|
|
/* send ICMP parameter problem unless it was a multicast or ICMPv6 */
|
|
if ((!ip6_addr_ismulticast(ip6_current_dest_addr())) &&
|
|
(IP6H_NEXTH(ip6hdr) != IP6_NEXTH_ICMP6)) {
|
|
icmp6_param_problem(p, ICMP6_PP_HEADER, ip_data.current_ip_header_tot_len - hlen);
|
|
}
|
|
#endif /* LWIP_ICMP */
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_input: Unsupported transport protocol %"U16_F"\n", IP6H_NEXTH(ip6hdr)));
|
|
pbuf_free(p);
|
|
IP6_STATS_INC(ip6.proterr);
|
|
IP6_STATS_INC(ip6.drop);
|
|
break;
|
|
}
|
|
}
|
|
|
|
ip6_input_cleanup:
|
|
ip_data.current_netif = NULL;
|
|
ip_data.current_ip6_header = NULL;
|
|
ip_data.current_ip_header_tot_len = 0;
|
|
ip6_addr_set_any(&ip_data.current_iphdr_src.ip6);
|
|
ip6_addr_set_any(&ip_data.current_iphdr_dest.ip6);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* Sends an IPv6 packet on a network interface. This function constructs
|
|
* the IPv6 header. If the source IPv6 address is NULL, the IPv6 "ANY" address is
|
|
* used as source (usually during network startup). If the source IPv6 address it
|
|
* IP6_ADDR_ANY, the most appropriate IPv6 address of the outgoing network
|
|
* interface is filled in as source address. If the destination IPv6 address is
|
|
* IP_HDRINCL, p is assumed to already include an IPv6 header and p->payload points
|
|
* to it instead of the data.
|
|
*
|
|
* @param p the packet to send (p->payload points to the data, e.g. next
|
|
protocol header; if dest == IP_HDRINCL, p already includes an
|
|
IPv6 header and p->payload points to that IPv6 header)
|
|
* @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
|
* IP address of the netif is selected and used as source address.
|
|
* if src == NULL, IP6_ADDR_ANY is used as source)
|
|
* @param dest the destination IPv6 address to send the packet to
|
|
* @param hl the Hop Limit value to be set in the IPv6 header
|
|
* @param tc the Traffic Class value to be set in the IPv6 header
|
|
* @param nexth the Next Header to be set in the IPv6 header
|
|
* @param netif the netif on which to send this packet
|
|
* @return ERR_OK if the packet was sent OK
|
|
* ERR_BUF if p doesn't have enough space for IPv6/LINK headers
|
|
* returns errors returned by netif->output
|
|
*/
|
|
err_t
|
|
ip6_output_if(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
|
|
u8_t hl, u8_t tc,
|
|
u8_t nexth, struct netif *netif)
|
|
{
|
|
struct ip6_hdr *ip6hdr;
|
|
ip6_addr_t dest_addr;
|
|
|
|
/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
|
|
gets altered as the packet is passed down the stack */
|
|
LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
|
|
|
/* Should the IPv6 header be generated or is it already included in p? */
|
|
if (dest != IP_HDRINCL) {
|
|
/* generate IPv6 header */
|
|
if (pbuf_header(p, IP6_HLEN)) {
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: not enough room for IPv6 header in pbuf\n"));
|
|
IP6_STATS_INC(ip6.err);
|
|
return ERR_BUF;
|
|
}
|
|
|
|
ip6hdr = (struct ip6_hdr *)p->payload;
|
|
LWIP_ASSERT("check that first pbuf can hold struct ip6_hdr",
|
|
(p->len >= sizeof(struct ip6_hdr)));
|
|
|
|
IP6H_HOPLIM_SET(ip6hdr, hl);
|
|
IP6H_NEXTH_SET(ip6hdr, nexth);
|
|
|
|
/* dest cannot be NULL here */
|
|
ip6_addr_copy(ip6hdr->dest, *dest);
|
|
|
|
IP6H_VTCFL_SET(ip6hdr, 6, tc, 0);
|
|
IP6H_PLEN_SET(ip6hdr, p->tot_len - IP6_HLEN);
|
|
|
|
if (src == NULL) {
|
|
src = IP6_ADDR_ANY;
|
|
}
|
|
else if (ip6_addr_isany(src)) {
|
|
src = ip6_select_source_address(netif, dest);
|
|
if ((src == NULL) || ip6_addr_isany(src)) {
|
|
/* No appropriate source address was found for this packet. */
|
|
LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: No suitable source address for packet.\n"));
|
|
IP6_STATS_INC(ip6.rterr);
|
|
return ERR_RTE;
|
|
}
|
|
}
|
|
/* src cannot be NULL here */
|
|
ip6_addr_copy(ip6hdr->src, *src);
|
|
|
|
} else {
|
|
/* IP header already included in p */
|
|
ip6hdr = (struct ip6_hdr *)p->payload;
|
|
ip6_addr_copy(dest_addr, ip6hdr->dest);
|
|
dest = &dest_addr;
|
|
}
|
|
|
|
IP6_STATS_INC(ip6.xmit);
|
|
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
|
|
ip6_debug_print(p);
|
|
|
|
#if ENABLE_LOOPBACK
|
|
/* TODO implement loopback for v6
|
|
if (ip6_addr_cmp(dest, netif_ip6_addr(0))) {
|
|
return netif_loop_output(netif, p, dest);
|
|
}*/
|
|
#endif /* ENABLE_LOOPBACK */
|
|
#if LWIP_IPV6_FRAG
|
|
/* don't fragment if interface has mtu set to 0 [loopif] */
|
|
if (netif->mtu && (p->tot_len > nd6_get_destination_mtu(dest, netif))) {
|
|
return ip6_frag(p, netif, dest);
|
|
}
|
|
#endif /* LWIP_IPV6_FRAG */
|
|
|
|
LWIP_DEBUGF(IP6_DEBUG, ("netif->output_ip6()"));
|
|
return netif->output_ip6(netif, p, dest);
|
|
}
|
|
|
|
/**
|
|
* Simple interface to ip6_output_if. It finds the outgoing network
|
|
* interface and calls upon ip6_output_if to do the actual work.
|
|
*
|
|
* @param p the packet to send (p->payload points to the data, e.g. next
|
|
protocol header; if dest == IP_HDRINCL, p already includes an
|
|
IPv6 header and p->payload points to that IPv6 header)
|
|
* @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
|
* IP address of the netif is selected and used as source address.
|
|
* if src == NULL, IP6_ADDR_ANY is used as source)
|
|
* @param dest the destination IPv6 address to send the packet to
|
|
* @param hl the Hop Limit value to be set in the IPv6 header
|
|
* @param tc the Traffic Class value to be set in the IPv6 header
|
|
* @param nexth the Next Header to be set in the IPv6 header
|
|
*
|
|
* @return ERR_RTE if no route is found
|
|
* see ip_output_if() for more return values
|
|
*/
|
|
err_t
|
|
ip6_output(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
|
|
u8_t hl, u8_t tc, u8_t nexth)
|
|
{
|
|
struct netif *netif;
|
|
struct ip6_hdr *ip6hdr;
|
|
ip6_addr_t src_addr, dest_addr;
|
|
|
|
/* pbufs passed to IPv6 must have a ref-count of 1 as their payload pointer
|
|
gets altered as the packet is passed down the stack */
|
|
LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
|
|
|
if (dest != IP_HDRINCL) {
|
|
netif = ip6_route(src, dest);
|
|
} else {
|
|
/* IP header included in p, read addresses. */
|
|
ip6hdr = (struct ip6_hdr *)p->payload;
|
|
ip6_addr_copy(src_addr, ip6hdr->src);
|
|
ip6_addr_copy(dest_addr, ip6hdr->dest);
|
|
netif = ip6_route(&src_addr, &dest_addr);
|
|
}
|
|
|
|
if (netif == NULL) {
|
|
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",
|
|
IP6_ADDR_BLOCK1(dest),
|
|
IP6_ADDR_BLOCK2(dest),
|
|
IP6_ADDR_BLOCK3(dest),
|
|
IP6_ADDR_BLOCK4(dest),
|
|
IP6_ADDR_BLOCK5(dest),
|
|
IP6_ADDR_BLOCK6(dest),
|
|
IP6_ADDR_BLOCK7(dest),
|
|
IP6_ADDR_BLOCK8(dest)));
|
|
IP6_STATS_INC(ip6.rterr);
|
|
return ERR_RTE;
|
|
}
|
|
|
|
return ip6_output_if(p, src, dest, hl, tc, nexth, netif);
|
|
}
|
|
|
|
|
|
#if LWIP_NETIF_HWADDRHINT
|
|
/** Like ip6_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
|
|
* before calling ip6_output_if.
|
|
*
|
|
* @param p the packet to send (p->payload points to the data, e.g. next
|
|
protocol header; if dest == IP_HDRINCL, p already includes an
|
|
IPv6 header and p->payload points to that IPv6 header)
|
|
* @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
|
|
* IP address of the netif is selected and used as source address.
|
|
* if src == NULL, IP6_ADDR_ANY is used as source)
|
|
* @param dest the destination IPv6 address to send the packet to
|
|
* @param hl the Hop Limit value to be set in the IPv6 header
|
|
* @param tc the Traffic Class value to be set in the IPv6 header
|
|
* @param nexth the Next Header to be set in the IPv6 header
|
|
* @param addr_hint address hint pointer set to netif->addr_hint before
|
|
* calling ip_output_if()
|
|
*
|
|
* @return ERR_RTE if no route is found
|
|
* see ip_output_if() for more return values
|
|
*/
|
|
err_t
|
|
ip6_output_hinted(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
|
|
u8_t hl, u8_t tc, u8_t nexth, u8_t *addr_hint)
|
|
{
|
|
struct netif *netif;
|
|
struct ip6_hdr *ip6hdr;
|
|
ip6_addr_t src_addr, dest_addr;
|
|
err_t err;
|
|
|
|
/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
|
|
gets altered as the packet is passed down the stack */
|
|
LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
|
|
|
if (dest != IP_HDRINCL) {
|
|
netif = ip6_route(src, dest);
|
|
} else {
|
|
/* IP header included in p, read addresses. */
|
|
ip6hdr = (struct ip6_hdr *)p->payload;
|
|
ip6_addr_copy(src_addr, ip6hdr->src);
|
|
ip6_addr_copy(dest_addr, ip6hdr->dest);
|
|
netif = ip6_route(&src_addr, &dest_addr);
|
|
}
|
|
|
|
if (netif == NULL) {
|
|
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",
|
|
IP6_ADDR_BLOCK1(dest),
|
|
IP6_ADDR_BLOCK2(dest),
|
|
IP6_ADDR_BLOCK3(dest),
|
|
IP6_ADDR_BLOCK4(dest),
|
|
IP6_ADDR_BLOCK5(dest),
|
|
IP6_ADDR_BLOCK6(dest),
|
|
IP6_ADDR_BLOCK7(dest),
|
|
IP6_ADDR_BLOCK8(dest)));
|
|
IP6_STATS_INC(ip6.rterr);
|
|
return ERR_RTE;
|
|
}
|
|
|
|
NETIF_SET_HWADDRHINT(netif, addr_hint);
|
|
err = ip6_output_if(p, src, dest, hl, tc, nexth, netif);
|
|
NETIF_SET_HWADDRHINT(netif, NULL);
|
|
|
|
return err;
|
|
}
|
|
#endif /* LWIP_NETIF_HWADDRHINT*/
|
|
|
|
#if LWIP_IPV6_MLD
|
|
/**
|
|
* Add a hop-by-hop options header with a router alert option and padding.
|
|
*
|
|
* Used by MLD when sending a Multicast listener report/done message.
|
|
*
|
|
* @param p the packet to which we will prepend the options header
|
|
* @param nexth the next header protocol number (e.g. IP6_NEXTH_ICMP6)
|
|
* @param value the value of the router alert option data (e.g. IP6_ROUTER_ALERT_VALUE_MLD)
|
|
* @return ERR_OK if hop-by-hop header was added, ERR_* otherwise
|
|
*/
|
|
err_t
|
|
ip6_options_add_hbh_ra(struct pbuf * p, u8_t nexth, u8_t value)
|
|
{
|
|
struct ip6_hbh_hdr * hbh_hdr;
|
|
|
|
/* Move pointer to make room for hop-by-hop options header. */
|
|
if (pbuf_header(p, sizeof(struct ip6_hbh_hdr))) {
|
|
LWIP_DEBUGF(IP6_DEBUG, ("ip6_options: no space for options header\n"));
|
|
IP6_STATS_INC(ip6.err);
|
|
return ERR_BUF;
|
|
}
|
|
|
|
hbh_hdr = (struct ip6_hbh_hdr *)p->payload;
|
|
|
|
/* Set fields. */
|
|
hbh_hdr->_nexth = nexth;
|
|
hbh_hdr->_hlen = 0;
|
|
hbh_hdr->_ra_opt_type = IP6_ROUTER_ALERT_OPTION;
|
|
hbh_hdr->_ra_opt_dlen = 2;
|
|
hbh_hdr->_ra_opt_data = value;
|
|
hbh_hdr->_padn_opt_type = IP6_PADN_ALERT_OPTION;
|
|
hbh_hdr->_padn_opt_dlen = 0;
|
|
|
|
return ERR_OK;
|
|
}
|
|
#endif /* LWIP_IPV6_MLD */
|
|
|
|
#if IP6_DEBUG
|
|
/* Print an IPv6 header by using LWIP_DEBUGF
|
|
* @param p an IPv6 packet, p->payload pointing to the IPv6 header
|
|
*/
|
|
void
|
|
ip6_debug_print(struct pbuf *p)
|
|
{
|
|
struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
|
|
|
|
LWIP_DEBUGF(IP6_DEBUG, ("IPv6 header:\n"));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %2"U16_F" | %3"U16_F" | %7"U32_F" | (ver, class, flow)\n",
|
|
IP6H_V(ip6hdr),
|
|
IP6H_TC(ip6hdr),
|
|
IP6H_FL(ip6hdr)));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %5"U16_F" | %3"U16_F" | %3"U16_F" | (plen, nexth, hopl)\n",
|
|
ntohs(IP6H_PLEN(ip6hdr)),
|
|
ntohs(IP6H_NEXTH(ip6hdr)),
|
|
ntohs(IP6H_HOPLIM(ip6hdr))));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (src)\n",
|
|
IP6_ADDR_BLOCK1(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK2(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK3(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK4(&(ip6hdr->src))));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
|
|
IP6_ADDR_BLOCK5(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK6(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK7(&(ip6hdr->src)),
|
|
IP6_ADDR_BLOCK8(&(ip6hdr->src))));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (dest)\n",
|
|
IP6_ADDR_BLOCK1(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK2(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK3(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK4(&(ip6hdr->dest))));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
|
|
IP6_ADDR_BLOCK5(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK6(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK7(&(ip6hdr->dest)),
|
|
IP6_ADDR_BLOCK8(&(ip6hdr->dest))));
|
|
LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
|
|
}
|
|
#endif /* IP6_DEBUG */
|
|
|
|
#endif /* LWIP_IPV6 */
|