[457] | 1 | /**
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| 2 | * @file
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| 3 | * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
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| 4 | *
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| 5 | * @see ip_frag.c
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| 6 | *
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| 7 | */
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| 8 |
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| 9 | /*
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| 10 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 11 | * All rights reserved.
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| 12 | *
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| 13 | * Redistribution and use in source and binary forms, with or without modification,
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| 14 | * are permitted provided that the following conditions are met:
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| 15 | *
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| 16 | * 1. Redistributions of source code must retain the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer.
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer in the documentation
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| 20 | * and/or other materials provided with the distribution.
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| 21 | * 3. The name of the author may not be used to endorse or promote products
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| 22 | * derived from this software without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 33 | * OF SUCH DAMAGE.
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| 34 | *
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| 35 | * This file is part of the lwIP TCP/IP stack.
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| 36 | *
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| 37 | * Author: Adam Dunkels <adam@sics.se>
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| 38 | *
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| 39 | */
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| 40 |
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| 41 | #include "lwip/opt.h"
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| 42 |
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| 43 | #if LWIP_IPV4
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| 44 |
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| 45 | #include "lwip/ip.h"
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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/ip4_frag.h"
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| 49 | #include "lwip/inet_chksum.h"
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| 50 | #include "lwip/netif.h"
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| 51 | #include "lwip/icmp.h"
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| 52 | #include "lwip/igmp.h"
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| 53 | #include "lwip/priv/raw_priv.h"
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| 54 | #include "lwip/udp.h"
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| 55 | #include "lwip/priv/tcp_priv.h"
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| 56 | #include "lwip/autoip.h"
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| 57 | #include "lwip/stats.h"
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| 58 | #include "lwip/prot/iana.h"
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| 59 |
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| 60 | #include <string.h>
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| 61 |
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| 62 | #ifdef LWIP_HOOK_FILENAME
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| 63 | #include LWIP_HOOK_FILENAME
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| 64 | #endif
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| 65 |
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| 66 | /** Set this to 0 in the rare case of wanting to call an extra function to
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| 67 | * generate the IP checksum (in contrast to calculating it on-the-fly). */
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| 68 | #ifndef LWIP_INLINE_IP_CHKSUM
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| 69 | #if LWIP_CHECKSUM_CTRL_PER_NETIF
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| 70 | #define LWIP_INLINE_IP_CHKSUM 0
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| 71 | #else /* LWIP_CHECKSUM_CTRL_PER_NETIF */
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| 72 | #define LWIP_INLINE_IP_CHKSUM 1
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| 73 | #endif /* LWIP_CHECKSUM_CTRL_PER_NETIF */
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| 74 | #endif
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| 75 |
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| 76 | #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
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| 77 | #define CHECKSUM_GEN_IP_INLINE 1
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| 78 | #else
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| 79 | #define CHECKSUM_GEN_IP_INLINE 0
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| 80 | #endif
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| 81 |
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| 82 | #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
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| 83 | #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
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| 84 |
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| 85 | /** Some defines for DHCP to let link-layer-addressed packets through while the
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| 86 | * netif is down.
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| 87 | * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT(port)
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| 88 | * to return 1 if the port is accepted and 0 if the port is not accepted.
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| 89 | */
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| 90 | #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
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| 91 | /* accept DHCP client port and custom port */
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| 92 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(LWIP_IANA_PORT_DHCP_CLIENT)) \
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| 93 | || (LWIP_IP_ACCEPT_UDP_PORT(port)))
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| 94 | #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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| 95 | /* accept custom port only */
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| 96 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(port))
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| 97 | #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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| 98 | /* accept DHCP client port only */
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| 99 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(LWIP_IANA_PORT_DHCP_CLIENT))
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| 100 | #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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| 101 |
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| 102 | #else /* LWIP_DHCP */
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| 103 | #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
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| 104 | #endif /* LWIP_DHCP */
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| 105 |
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| 106 | /** The IP header ID of the next outgoing IP packet */
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| 107 | static u16_t ip_id;
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| 108 |
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| 109 | #if LWIP_MULTICAST_TX_OPTIONS
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| 110 | /** The default netif used for multicast */
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| 111 | static struct netif *ip4_default_multicast_netif;
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| 112 |
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| 113 | /**
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| 114 | * @ingroup ip4
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| 115 | * Set a default netif for IPv4 multicast. */
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| 116 | void
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| 117 | ip4_set_default_multicast_netif(struct netif *default_multicast_netif)
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| 118 | {
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| 119 | ip4_default_multicast_netif = default_multicast_netif;
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| 120 | }
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| 121 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
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| 122 |
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| 123 | #ifdef LWIP_HOOK_IP4_ROUTE_SRC
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| 124 | /**
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| 125 | * Source based IPv4 routing must be fully implemented in
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| 126 | * LWIP_HOOK_IP4_ROUTE_SRC(). This function only provides the parameters.
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| 127 | */
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| 128 | struct netif *
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| 129 | ip4_route_src(const ip4_addr_t *src, const ip4_addr_t *dest)
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| 130 | {
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| 131 | if (src != NULL) {
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| 132 | /* when src==NULL, the hook is called from ip4_route(dest) */
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| 133 | struct netif *netif = LWIP_HOOK_IP4_ROUTE_SRC(src, dest);
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| 134 | if (netif != NULL) {
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| 135 | return netif;
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| 136 | }
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| 137 | }
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| 138 | return ip4_route(dest);
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| 139 | }
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| 140 | #endif /* LWIP_HOOK_IP4_ROUTE_SRC */
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| 141 |
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| 142 | /**
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| 143 | * Finds the appropriate network interface for a given IP address. It
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| 144 | * searches the list of network interfaces linearly. A match is found
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| 145 | * if the masked IP address of the network interface equals the masked
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| 146 | * IP address given to the function.
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| 147 | *
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| 148 | * @param dest the destination IP address for which to find the route
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| 149 | * @return the netif on which to send to reach dest
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| 150 | */
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| 151 | struct netif *
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| 152 | ip4_route(const ip4_addr_t *dest)
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| 153 | {
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| 154 | #if !LWIP_SINGLE_NETIF
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| 155 | struct netif *netif;
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| 156 |
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| 157 | LWIP_ASSERT_CORE_LOCKED();
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| 158 |
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| 159 | #if LWIP_MULTICAST_TX_OPTIONS
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| 160 | /* Use administratively selected interface for multicast by default */
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| 161 | if (ip4_addr_ismulticast(dest) && ip4_default_multicast_netif) {
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| 162 | return ip4_default_multicast_netif;
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| 163 | }
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| 164 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
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| 165 |
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| 166 | /* bug #54569: in case LWIP_SINGLE_NETIF=1 and LWIP_DEBUGF() disabled, the following loop is optimized away */
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| 167 | LWIP_UNUSED_ARG(dest);
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| 168 |
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| 169 | /* iterate through netifs */
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| 170 | NETIF_FOREACH(netif) {
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| 171 | /* is the netif up, does it have a link and a valid address? */
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| 172 | if (netif_is_up(netif) && netif_is_link_up(netif) && !ip4_addr_isany_val(*netif_ip4_addr(netif))) {
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| 173 | /* network mask matches? */
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| 174 | if (ip4_addr_netcmp(dest, netif_ip4_addr(netif), netif_ip4_netmask(netif))) {
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| 175 | /* return netif on which to forward IP packet */
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| 176 | return netif;
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| 177 | }
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| 178 | /* gateway matches on a non broadcast interface? (i.e. peer in a point to point interface) */
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| 179 | if (((netif->flags & NETIF_FLAG_BROADCAST) == 0) && ip4_addr_cmp(dest, netif_ip4_gw(netif))) {
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| 180 | /* return netif on which to forward IP packet */
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| 181 | return netif;
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| 182 | }
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| 183 | }
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| 184 | }
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| 185 |
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| 186 | #if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF
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| 187 | /* loopif is disabled, looopback traffic is passed through any netif */
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| 188 | if (ip4_addr_isloopback(dest)) {
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| 189 | /* don't check for link on loopback traffic */
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| 190 | if (netif_default != NULL && netif_is_up(netif_default)) {
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| 191 | return netif_default;
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| 192 | }
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| 193 | /* default netif is not up, just use any netif for loopback traffic */
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| 194 | NETIF_FOREACH(netif) {
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| 195 | if (netif_is_up(netif)) {
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| 196 | return netif;
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| 197 | }
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| 198 | }
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| 199 | return NULL;
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| 200 | }
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| 201 | #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
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| 202 |
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| 203 | #ifdef LWIP_HOOK_IP4_ROUTE_SRC
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| 204 | netif = LWIP_HOOK_IP4_ROUTE_SRC(NULL, dest);
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| 205 | if (netif != NULL) {
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| 206 | return netif;
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| 207 | }
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| 208 | #elif defined(LWIP_HOOK_IP4_ROUTE)
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| 209 | netif = LWIP_HOOK_IP4_ROUTE(dest);
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| 210 | if (netif != NULL) {
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| 211 | return netif;
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| 212 | }
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| 213 | #endif
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| 214 | #endif /* !LWIP_SINGLE_NETIF */
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| 215 |
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| 216 | if ((netif_default == NULL) || !netif_is_up(netif_default) || !netif_is_link_up(netif_default) ||
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| 217 | ip4_addr_isany_val(*netif_ip4_addr(netif_default)) || ip4_addr_isloopback(dest)) {
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| 218 | /* No matching netif found and default netif is not usable.
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| 219 | If this is not good enough for you, use LWIP_HOOK_IP4_ROUTE() */
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| 220 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 221 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
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| 222 | IP_STATS_INC(ip.rterr);
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| 223 | MIB2_STATS_INC(mib2.ipoutnoroutes);
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| 224 | return NULL;
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| 225 | }
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| 226 |
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| 227 | return netif_default;
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| 228 | }
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| 229 |
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| 230 | #if IP_FORWARD
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| 231 | /**
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| 232 | * Determine whether an IP address is in a reserved set of addresses
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| 233 | * that may not be forwarded, or whether datagrams to that destination
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| 234 | * may be forwarded.
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| 235 | * @param p the packet to forward
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| 236 | * @return 1: can forward 0: discard
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| 237 | */
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| 238 | static int
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| 239 | ip4_canforward(struct pbuf *p)
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| 240 | {
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| 241 | u32_t addr = lwip_htonl(ip4_addr_get_u32(ip4_current_dest_addr()));
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| 242 |
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| 243 | #ifdef LWIP_HOOK_IP4_CANFORWARD
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| 244 | int ret = LWIP_HOOK_IP4_CANFORWARD(p, addr);
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| 245 | if (ret >= 0) {
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| 246 | return ret;
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| 247 | }
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| 248 | #endif /* LWIP_HOOK_IP4_CANFORWARD */
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| 249 |
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| 250 | if (p->flags & PBUF_FLAG_LLBCAST) {
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| 251 | /* don't route link-layer broadcasts */
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| 252 | return 0;
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| 253 | }
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| 254 | if ((p->flags & PBUF_FLAG_LLMCAST) || IP_MULTICAST(addr)) {
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| 255 | /* don't route link-layer multicasts (use LWIP_HOOK_IP4_CANFORWARD instead) */
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| 256 | return 0;
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| 257 | }
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| 258 | if (IP_EXPERIMENTAL(addr)) {
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| 259 | return 0;
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| 260 | }
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| 261 | if (IP_CLASSA(addr)) {
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| 262 | u32_t net = addr & IP_CLASSA_NET;
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| 263 | if ((net == 0) || (net == ((u32_t)IP_LOOPBACKNET << IP_CLASSA_NSHIFT))) {
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| 264 | /* don't route loopback packets */
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| 265 | return 0;
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| 266 | }
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| 267 | }
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| 268 | return 1;
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| 269 | }
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| 270 |
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| 271 | /**
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| 272 | * Forwards an IP packet. It finds an appropriate route for the
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| 273 | * packet, decrements the TTL value of the packet, adjusts the
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| 274 | * checksum and outputs the packet on the appropriate interface.
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| 275 | *
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| 276 | * @param p the packet to forward (p->payload points to IP header)
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| 277 | * @param iphdr the IP header of the input packet
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| 278 | * @param inp the netif on which this packet was received
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| 279 | */
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| 280 | static void
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| 281 | ip4_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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| 282 | {
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| 283 | struct netif *netif;
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| 284 |
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| 285 | PERF_START;
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| 286 | LWIP_UNUSED_ARG(inp);
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| 287 |
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| 288 | if (!ip4_canforward(p)) {
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| 289 | goto return_noroute;
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| 290 | }
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| 291 |
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| 292 | /* RFC3927 2.7: do not forward link-local addresses */
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| 293 | if (ip4_addr_islinklocal(ip4_current_dest_addr())) {
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| 294 | LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 295 | ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()),
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| 296 | ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr())));
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| 297 | goto return_noroute;
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| 298 | }
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| 299 |
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| 300 | /* Find network interface where to forward this IP packet to. */
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| 301 | netif = ip4_route_src(ip4_current_src_addr(), ip4_current_dest_addr());
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| 302 | if (netif == NULL) {
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| 303 | LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
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| 304 | ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()),
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| 305 | ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr())));
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| 306 | /* @todo: send ICMP_DUR_NET? */
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| 307 | goto return_noroute;
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| 308 | }
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| 309 | #if !IP_FORWARD_ALLOW_TX_ON_RX_NETIF
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| 310 | /* Do not forward packets onto the same network interface on which
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| 311 | * they arrived. */
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| 312 | if (netif == inp) {
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| 313 | LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: not bouncing packets back on incoming interface.\n"));
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| 314 | goto return_noroute;
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| 315 | }
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| 316 | #endif /* IP_FORWARD_ALLOW_TX_ON_RX_NETIF */
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| 317 |
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| 318 | /* decrement TTL */
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| 319 | IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
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| 320 | /* send ICMP if TTL == 0 */
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| 321 | if (IPH_TTL(iphdr) == 0) {
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| 322 | MIB2_STATS_INC(mib2.ipinhdrerrors);
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| 323 | #if LWIP_ICMP
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| 324 | /* Don't send ICMP messages in response to ICMP messages */
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| 325 | if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
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| 326 | icmp_time_exceeded(p, ICMP_TE_TTL);
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| 327 | }
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| 328 | #endif /* LWIP_ICMP */
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| 329 | return;
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| 330 | }
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| 331 |
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| 332 | /* Incrementally update the IP checksum. */
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| 333 | if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
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| 334 | IPH_CHKSUM_SET(iphdr, (u16_t)(IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1));
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| 335 | } else {
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| 336 | IPH_CHKSUM_SET(iphdr, (u16_t)(IPH_CHKSUM(iphdr) + PP_HTONS(0x100)));
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| 337 | }
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| 338 |
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| 339 | LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 340 | ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()),
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| 341 | ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr())));
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| 342 |
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| 343 | IP_STATS_INC(ip.fw);
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| 344 | MIB2_STATS_INC(mib2.ipforwdatagrams);
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| 345 | IP_STATS_INC(ip.xmit);
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| 346 |
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| 347 | PERF_STOP("ip4_forward");
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| 348 | /* don't fragment if interface has mtu set to 0 [loopif] */
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| 349 | if (netif->mtu && (p->tot_len > netif->mtu)) {
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| 350 | if ((IPH_OFFSET(iphdr) & PP_NTOHS(IP_DF)) == 0) {
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| 351 | #if IP_FRAG
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| 352 | ip4_frag(p, netif, ip4_current_dest_addr());
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| 353 | #else /* IP_FRAG */
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| 354 | /* @todo: send ICMP Destination Unreachable code 13 "Communication administratively prohibited"? */
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| 355 | #endif /* IP_FRAG */
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| 356 | } else {
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| 357 | #if LWIP_ICMP
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| 358 | /* send ICMP Destination Unreachable code 4: "Fragmentation Needed and DF Set" */
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| 359 | icmp_dest_unreach(p, ICMP_DUR_FRAG);
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| 360 | #endif /* LWIP_ICMP */
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| 361 | }
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| 362 | return;
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| 363 | }
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| 364 | /* transmit pbuf on chosen interface */
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| 365 | netif->output(netif, p, ip4_current_dest_addr());
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| 366 | return;
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| 367 | return_noroute:
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| 368 | MIB2_STATS_INC(mib2.ipoutnoroutes);
|
---|
| 369 | }
|
---|
| 370 | #endif /* IP_FORWARD */
|
---|
| 371 |
|
---|
| 372 | /** Return true if the current input packet should be accepted on this netif */
|
---|
| 373 | static int
|
---|
| 374 | ip4_input_accept(struct netif *netif)
|
---|
| 375 | {
|
---|
| 376 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
|
---|
| 377 | ip4_addr_get_u32(ip4_current_dest_addr()), ip4_addr_get_u32(netif_ip4_addr(netif)),
|
---|
| 378 | ip4_addr_get_u32(ip4_current_dest_addr()) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
|
---|
| 379 | ip4_addr_get_u32(netif_ip4_addr(netif)) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
|
---|
| 380 | ip4_addr_get_u32(ip4_current_dest_addr()) & ~ip4_addr_get_u32(netif_ip4_netmask(netif))));
|
---|
| 381 |
|
---|
| 382 | /* interface is up and configured? */
|
---|
| 383 | if ((netif_is_up(netif)) && (!ip4_addr_isany_val(*netif_ip4_addr(netif)))) {
|
---|
| 384 | /* unicast to this interface address? */
|
---|
| 385 | if (ip4_addr_cmp(ip4_current_dest_addr(), netif_ip4_addr(netif)) ||
|
---|
| 386 | /* or broadcast on this interface network address? */
|
---|
| 387 | ip4_addr_isbroadcast(ip4_current_dest_addr(), netif)
|
---|
| 388 | #if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF
|
---|
| 389 | || (ip4_addr_get_u32(ip4_current_dest_addr()) == PP_HTONL(IPADDR_LOOPBACK))
|
---|
| 390 | #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
|
---|
| 391 | ) {
|
---|
| 392 | LWIP_DEBUGF(IP_DEBUG, ("ip4_input: packet accepted on interface %c%c\n",
|
---|
| 393 | netif->name[0], netif->name[1]));
|
---|
| 394 | /* accept on this netif */
|
---|
| 395 | return 1;
|
---|
| 396 | }
|
---|
| 397 | #if LWIP_AUTOIP
|
---|
| 398 | /* connections to link-local addresses must persist after changing
|
---|
| 399 | the netif's address (RFC3927 ch. 1.9) */
|
---|
| 400 | if (autoip_accept_packet(netif, ip4_current_dest_addr())) {
|
---|
| 401 | LWIP_DEBUGF(IP_DEBUG, ("ip4_input: LLA packet accepted on interface %c%c\n",
|
---|
| 402 | netif->name[0], netif->name[1]));
|
---|
| 403 | /* accept on this netif */
|
---|
| 404 | return 1;
|
---|
| 405 | }
|
---|
| 406 | #endif /* LWIP_AUTOIP */
|
---|
| 407 | }
|
---|
| 408 | return 0;
|
---|
| 409 | }
|
---|
| 410 |
|
---|
| 411 | /**
|
---|
| 412 | * This function is called by the network interface device driver when
|
---|
| 413 | * an IP packet is received. The function does the basic checks of the
|
---|
| 414 | * IP header such as packet size being at least larger than the header
|
---|
| 415 | * size etc. If the packet was not destined for us, the packet is
|
---|
| 416 | * forwarded (using ip_forward). The IP checksum is always checked.
|
---|
| 417 | *
|
---|
| 418 | * Finally, the packet is sent to the upper layer protocol input function.
|
---|
| 419 | *
|
---|
| 420 | * @param p the received IP packet (p->payload points to IP header)
|
---|
| 421 | * @param inp the netif on which this packet was received
|
---|
| 422 | * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
|
---|
| 423 | * processed, but currently always returns ERR_OK)
|
---|
| 424 | */
|
---|
| 425 | err_t
|
---|
| 426 | ip4_input(struct pbuf *p, struct netif *inp)
|
---|
| 427 | {
|
---|
| 428 | const struct ip_hdr *iphdr;
|
---|
| 429 | struct netif *netif;
|
---|
| 430 | u16_t iphdr_hlen;
|
---|
| 431 | u16_t iphdr_len;
|
---|
| 432 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING || LWIP_IGMP
|
---|
| 433 | int check_ip_src = 1;
|
---|
| 434 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING || LWIP_IGMP */
|
---|
| 435 | #if LWIP_RAW
|
---|
| 436 | raw_input_state_t raw_status;
|
---|
| 437 | #endif /* LWIP_RAW */
|
---|
| 438 | #if ETHARP_SUPPORT_STATIC_ENTRIES && LWIP_DHCP
|
---|
| 439 | struct etharp_hdr *hdr = (struct etharp_hdr *)(p->payload - SIZEOF_ETH_HDR);
|
---|
| 440 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
|
---|
| 441 |
|
---|
| 442 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 443 |
|
---|
| 444 | IP_STATS_INC(ip.recv);
|
---|
| 445 | MIB2_STATS_INC(mib2.ipinreceives);
|
---|
| 446 |
|
---|
| 447 | /* identify the IP header */
|
---|
| 448 | iphdr = (struct ip_hdr *)p->payload;
|
---|
| 449 | if (IPH_V(iphdr) != 4) {
|
---|
| 450 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", (u16_t)IPH_V(iphdr)));
|
---|
| 451 | ip4_debug_print(p);
|
---|
| 452 | pbuf_free(p);
|
---|
| 453 | IP_STATS_INC(ip.err);
|
---|
| 454 | IP_STATS_INC(ip.drop);
|
---|
| 455 | MIB2_STATS_INC(mib2.ipinhdrerrors);
|
---|
| 456 | return ERR_OK;
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | #ifdef LWIP_HOOK_IP4_INPUT
|
---|
| 460 | if (LWIP_HOOK_IP4_INPUT(p, inp)) {
|
---|
| 461 | /* the packet has been eaten */
|
---|
| 462 | return ERR_OK;
|
---|
| 463 | }
|
---|
| 464 | #endif
|
---|
| 465 |
|
---|
| 466 | /* obtain IP header length in bytes */
|
---|
| 467 | iphdr_hlen = IPH_HL_BYTES(iphdr);
|
---|
| 468 | /* obtain ip length in bytes */
|
---|
| 469 | iphdr_len = lwip_ntohs(IPH_LEN(iphdr));
|
---|
| 470 |
|
---|
| 471 | /* Trim pbuf. This is especially required for packets < 60 bytes. */
|
---|
| 472 | if (iphdr_len < p->tot_len) {
|
---|
| 473 | pbuf_realloc(p, iphdr_len);
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
|
---|
| 477 | if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len) || (iphdr_hlen < IP_HLEN)) {
|
---|
| 478 | if (iphdr_hlen < IP_HLEN) {
|
---|
| 479 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 480 | ("ip4_input: short IP header (%"U16_F" bytes) received, IP packet dropped\n", iphdr_hlen));
|
---|
| 481 | }
|
---|
| 482 | if (iphdr_hlen > p->len) {
|
---|
| 483 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 484 | ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
|
---|
| 485 | iphdr_hlen, p->len));
|
---|
| 486 | }
|
---|
| 487 | if (iphdr_len > p->tot_len) {
|
---|
| 488 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 489 | ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
|
---|
| 490 | iphdr_len, p->tot_len));
|
---|
| 491 | }
|
---|
| 492 | /* free (drop) packet pbufs */
|
---|
| 493 | pbuf_free(p);
|
---|
| 494 | IP_STATS_INC(ip.lenerr);
|
---|
| 495 | IP_STATS_INC(ip.drop);
|
---|
| 496 | MIB2_STATS_INC(mib2.ipindiscards);
|
---|
| 497 | return ERR_OK;
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | /* verify checksum */
|
---|
| 501 | #if CHECKSUM_CHECK_IP
|
---|
| 502 | IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_CHECK_IP) {
|
---|
| 503 | if (inet_chksum(iphdr, iphdr_hlen) != 0) {
|
---|
| 504 |
|
---|
| 505 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 506 | ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
|
---|
| 507 | ip4_debug_print(p);
|
---|
| 508 | pbuf_free(p);
|
---|
| 509 | IP_STATS_INC(ip.chkerr);
|
---|
| 510 | IP_STATS_INC(ip.drop);
|
---|
| 511 | MIB2_STATS_INC(mib2.ipinhdrerrors);
|
---|
| 512 | return ERR_OK;
|
---|
| 513 | }
|
---|
| 514 | }
|
---|
| 515 | #endif
|
---|
| 516 |
|
---|
| 517 | /* copy IP addresses to aligned ip_addr_t */
|
---|
| 518 | ip_addr_copy_from_ip4(ip_data.current_iphdr_dest, iphdr->dest);
|
---|
| 519 | ip_addr_copy_from_ip4(ip_data.current_iphdr_src, iphdr->src);
|
---|
| 520 |
|
---|
| 521 | /* match packet against an interface, i.e. is this packet for us? */
|
---|
| 522 | if (ip4_addr_ismulticast(ip4_current_dest_addr())) {
|
---|
| 523 | #if LWIP_IGMP
|
---|
| 524 | if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, ip4_current_dest_addr()))) {
|
---|
| 525 | /* IGMP snooping switches need 0.0.0.0 to be allowed as source address (RFC 4541) */
|
---|
| 526 | ip4_addr_t allsystems;
|
---|
| 527 | IP4_ADDR(&allsystems, 224, 0, 0, 1);
|
---|
| 528 | if (ip4_addr_cmp(ip4_current_dest_addr(), &allsystems) &&
|
---|
| 529 | ip4_addr_isany(ip4_current_src_addr())) {
|
---|
| 530 | check_ip_src = 0;
|
---|
| 531 | }
|
---|
| 532 | netif = inp;
|
---|
| 533 | } else {
|
---|
| 534 | netif = NULL;
|
---|
| 535 | }
|
---|
| 536 | #else /* LWIP_IGMP */
|
---|
| 537 | if ((netif_is_up(inp)) && (!ip4_addr_isany_val(*netif_ip4_addr(inp)))) {
|
---|
| 538 | netif = inp;
|
---|
| 539 | } else {
|
---|
| 540 | netif = NULL;
|
---|
| 541 | }
|
---|
| 542 | #endif /* LWIP_IGMP */
|
---|
| 543 | } else {
|
---|
| 544 | /* start trying with inp. if that's not acceptable, start walking the
|
---|
| 545 | list of configured netifs. */
|
---|
| 546 | if (ip4_input_accept(inp)) {
|
---|
| 547 | netif = inp;
|
---|
| 548 | } else {
|
---|
| 549 | netif = NULL;
|
---|
| 550 | #if !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF
|
---|
| 551 | /* Packets sent to the loopback address must not be accepted on an
|
---|
| 552 | * interface that does not have the loopback address assigned to it,
|
---|
| 553 | * unless a non-loopback interface is used for loopback traffic. */
|
---|
| 554 | if (!ip4_addr_isloopback(ip4_current_dest_addr()))
|
---|
| 555 | #endif /* !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF */
|
---|
| 556 | {
|
---|
| 557 | #if !LWIP_SINGLE_NETIF
|
---|
| 558 | NETIF_FOREACH(netif) {
|
---|
| 559 | if (netif == inp) {
|
---|
| 560 | /* we checked that before already */
|
---|
| 561 | continue;
|
---|
| 562 | }
|
---|
| 563 | if (ip4_input_accept(netif)) {
|
---|
| 564 | break;
|
---|
| 565 | }
|
---|
| 566 | }
|
---|
| 567 | #endif /* !LWIP_SINGLE_NETIF */
|
---|
| 568 | }
|
---|
| 569 | }
|
---|
| 570 | }
|
---|
| 571 |
|
---|
| 572 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING
|
---|
| 573 | /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
|
---|
| 574 | * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
|
---|
| 575 | * According to RFC 1542 section 3.1.1, referred by RFC 2131).
|
---|
| 576 | *
|
---|
| 577 | * If you want to accept private broadcast communication while a netif is down,
|
---|
| 578 | * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
|
---|
| 579 | *
|
---|
| 580 | * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
|
---|
| 581 | */
|
---|
| 582 | if (netif == NULL) {
|
---|
| 583 | /* remote port is DHCP server? */
|
---|
| 584 | if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
|
---|
| 585 | const struct udp_hdr *udphdr = (const struct udp_hdr *)((const u8_t *)iphdr + iphdr_hlen);
|
---|
| 586 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: UDP packet to DHCP client port %"U16_F"\n",
|
---|
| 587 | lwip_ntohs(udphdr->dest)));
|
---|
| 588 | if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
|
---|
| 589 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: DHCP packet accepted.\n"));
|
---|
| 590 | netif = inp;
|
---|
| 591 | check_ip_src = 0;
|
---|
| 592 | }
|
---|
| 593 | }
|
---|
| 594 | }
|
---|
| 595 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
| 596 |
|
---|
| 597 | /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
|
---|
| 598 | #if LWIP_IGMP || IP_ACCEPT_LINK_LAYER_ADDRESSING
|
---|
| 599 | if (check_ip_src
|
---|
| 600 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING
|
---|
| 601 | /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
|
---|
| 602 | && !ip4_addr_isany_val(*ip4_current_src_addr())
|
---|
| 603 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
| 604 | )
|
---|
| 605 | #endif /* LWIP_IGMP || IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
| 606 | {
|
---|
| 607 | if ((ip4_addr_isbroadcast(ip4_current_src_addr(), inp)) ||
|
---|
| 608 | (ip4_addr_ismulticast(ip4_current_src_addr()))) {
|
---|
| 609 | /* packet source is not valid */
|
---|
| 610 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip4_input: packet source is not valid.\n"));
|
---|
| 611 | /* free (drop) packet pbufs */
|
---|
| 612 | pbuf_free(p);
|
---|
| 613 | IP_STATS_INC(ip.drop);
|
---|
| 614 | MIB2_STATS_INC(mib2.ipinaddrerrors);
|
---|
| 615 | MIB2_STATS_INC(mib2.ipindiscards);
|
---|
| 616 | return ERR_OK;
|
---|
| 617 | }
|
---|
| 618 | }
|
---|
| 619 |
|
---|
| 620 | /* packet not for us? */
|
---|
| 621 | if (netif == NULL) {
|
---|
| 622 | /* packet not for us, route or discard */
|
---|
| 623 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: packet not for us.\n"));
|
---|
| 624 | #if IP_FORWARD
|
---|
| 625 | /* non-broadcast packet? */
|
---|
| 626 | if (!ip4_addr_isbroadcast(ip4_current_dest_addr(), inp)) {
|
---|
| 627 | /* try to forward IP packet on (other) interfaces */
|
---|
| 628 | ip4_forward(p, (struct ip_hdr *)p->payload, inp);
|
---|
| 629 | } else
|
---|
| 630 | #endif /* IP_FORWARD */
|
---|
| 631 | {
|
---|
| 632 | IP_STATS_INC(ip.drop);
|
---|
| 633 | MIB2_STATS_INC(mib2.ipinaddrerrors);
|
---|
| 634 | MIB2_STATS_INC(mib2.ipindiscards);
|
---|
| 635 | }
|
---|
| 636 | pbuf_free(p);
|
---|
| 637 | return ERR_OK;
|
---|
| 638 | }
|
---|
| 639 | /* packet consists of multiple fragments? */
|
---|
| 640 | if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
|
---|
| 641 | #if IP_REASSEMBLY /* packet fragment reassembly code present? */
|
---|
| 642 | LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip4_reass()\n",
|
---|
| 643 | lwip_ntohs(IPH_ID(iphdr)), p->tot_len, lwip_ntohs(IPH_LEN(iphdr)), (u16_t)!!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (u16_t)((lwip_ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK) * 8)));
|
---|
| 644 | /* reassemble the packet*/
|
---|
| 645 | p = ip4_reass(p);
|
---|
| 646 | /* packet not fully reassembled yet? */
|
---|
| 647 | if (p == NULL) {
|
---|
| 648 | return ERR_OK;
|
---|
| 649 | }
|
---|
| 650 | iphdr = (const struct ip_hdr *)p->payload;
|
---|
| 651 | #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
|
---|
| 652 | pbuf_free(p);
|
---|
| 653 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
|
---|
| 654 | lwip_ntohs(IPH_OFFSET(iphdr))));
|
---|
| 655 | IP_STATS_INC(ip.opterr);
|
---|
| 656 | IP_STATS_INC(ip.drop);
|
---|
| 657 | /* unsupported protocol feature */
|
---|
| 658 | MIB2_STATS_INC(mib2.ipinunknownprotos);
|
---|
| 659 | return ERR_OK;
|
---|
| 660 | #endif /* IP_REASSEMBLY */
|
---|
| 661 | }
|
---|
| 662 |
|
---|
| 663 | #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
|
---|
| 664 |
|
---|
| 665 | #if LWIP_IGMP
|
---|
| 666 | /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
|
---|
| 667 | if ((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
|
---|
| 668 | #else
|
---|
| 669 | if (iphdr_hlen > IP_HLEN) {
|
---|
| 670 | #endif /* LWIP_IGMP */
|
---|
| 671 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
|
---|
| 672 | pbuf_free(p);
|
---|
| 673 | IP_STATS_INC(ip.opterr);
|
---|
| 674 | IP_STATS_INC(ip.drop);
|
---|
| 675 | /* unsupported protocol feature */
|
---|
| 676 | MIB2_STATS_INC(mib2.ipinunknownprotos);
|
---|
| 677 | return ERR_OK;
|
---|
| 678 | }
|
---|
| 679 | #endif /* IP_OPTIONS_ALLOWED == 0 */
|
---|
| 680 |
|
---|
| 681 | /* send to upper layers */
|
---|
| 682 | LWIP_DEBUGF(IP_DEBUG, ("ip4_input: \n"));
|
---|
| 683 | ip4_debug_print(p);
|
---|
| 684 | LWIP_DEBUGF(IP_DEBUG, ("ip4_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
|
---|
| 685 |
|
---|
| 686 | ip_data.current_netif = netif;
|
---|
| 687 | ip_data.current_input_netif = inp;
|
---|
| 688 | ip_data.current_ip4_header = iphdr;
|
---|
| 689 | ip_data.current_ip_header_tot_len = IPH_HL_BYTES(iphdr);
|
---|
| 690 |
|
---|
| 691 | #if LWIP_RAW
|
---|
| 692 | /* raw input did not eat the packet? */
|
---|
| 693 | raw_status = raw_input(p, inp);
|
---|
| 694 | if (raw_status != RAW_INPUT_EATEN)
|
---|
| 695 | #endif /* LWIP_RAW */
|
---|
| 696 | {
|
---|
| 697 | pbuf_remove_header(p, iphdr_hlen); /* Move to payload, no check necessary. */
|
---|
| 698 |
|
---|
| 699 | switch (IPH_PROTO(iphdr)) {
|
---|
| 700 | #if LWIP_UDP
|
---|
| 701 | case IP_PROTO_UDP:
|
---|
| 702 | #if LWIP_UDPLITE
|
---|
| 703 | case IP_PROTO_UDPLITE:
|
---|
| 704 | #endif /* LWIP_UDPLITE */
|
---|
| 705 | MIB2_STATS_INC(mib2.ipindelivers);
|
---|
| 706 | udp_input(p, inp);
|
---|
| 707 | break;
|
---|
| 708 | #endif /* LWIP_UDP */
|
---|
| 709 | #if LWIP_TCP
|
---|
| 710 | case IP_PROTO_TCP:
|
---|
| 711 | MIB2_STATS_INC(mib2.ipindelivers);
|
---|
| 712 | tcp_input(p, inp);
|
---|
| 713 | break;
|
---|
| 714 | #endif /* LWIP_TCP */
|
---|
| 715 | #if LWIP_ICMP
|
---|
| 716 | case IP_PROTO_ICMP:
|
---|
| 717 | MIB2_STATS_INC(mib2.ipindelivers);
|
---|
| 718 | #if ETHARP_SUPPORT_STATIC_ENTRIES && LWIP_DHCP
|
---|
| 719 | /* FOR PING ERROR WHEN NO ARP PAKCET */
|
---|
| 720 | etharp_add_static_entry(ip4_current_src_addr(), &(hdr->shwaddr));
|
---|
| 721 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
|
---|
| 722 | icmp_input(p, inp);
|
---|
| 723 | break;
|
---|
| 724 | #endif /* LWIP_ICMP */
|
---|
| 725 | #if LWIP_IGMP
|
---|
| 726 | case IP_PROTO_IGMP:
|
---|
| 727 | igmp_input(p, inp, ip4_current_dest_addr());
|
---|
| 728 | break;
|
---|
| 729 | #endif /* LWIP_IGMP */
|
---|
| 730 | default:
|
---|
| 731 | #if LWIP_RAW
|
---|
| 732 | if (raw_status == RAW_INPUT_DELIVERED) {
|
---|
| 733 | MIB2_STATS_INC(mib2.ipindelivers);
|
---|
| 734 | } else
|
---|
| 735 | #endif /* LWIP_RAW */
|
---|
| 736 | {
|
---|
| 737 | #if LWIP_ICMP
|
---|
| 738 | /* send ICMP destination protocol unreachable unless is was a broadcast */
|
---|
| 739 | if (!ip4_addr_isbroadcast(ip4_current_dest_addr(), netif) &&
|
---|
| 740 | !ip4_addr_ismulticast(ip4_current_dest_addr())) {
|
---|
| 741 | pbuf_header_force(p, (s16_t)iphdr_hlen); /* Move to ip header, no check necessary. */
|
---|
| 742 | icmp_dest_unreach(p, ICMP_DUR_PROTO);
|
---|
| 743 | }
|
---|
| 744 | #endif /* LWIP_ICMP */
|
---|
| 745 |
|
---|
| 746 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", (u16_t)IPH_PROTO(iphdr)));
|
---|
| 747 |
|
---|
| 748 | IP_STATS_INC(ip.proterr);
|
---|
| 749 | IP_STATS_INC(ip.drop);
|
---|
| 750 | MIB2_STATS_INC(mib2.ipinunknownprotos);
|
---|
| 751 | }
|
---|
| 752 | pbuf_free(p);
|
---|
| 753 | break;
|
---|
| 754 | }
|
---|
| 755 | }
|
---|
| 756 |
|
---|
| 757 | /* @todo: this is not really necessary... */
|
---|
| 758 | ip_data.current_netif = NULL;
|
---|
| 759 | ip_data.current_input_netif = NULL;
|
---|
| 760 | ip_data.current_ip4_header = NULL;
|
---|
| 761 | ip_data.current_ip_header_tot_len = 0;
|
---|
| 762 | ip4_addr_set_any(ip4_current_src_addr());
|
---|
| 763 | ip4_addr_set_any(ip4_current_dest_addr());
|
---|
| 764 |
|
---|
| 765 | return ERR_OK;
|
---|
| 766 | }
|
---|
| 767 |
|
---|
| 768 | /**
|
---|
| 769 | * Sends an IP packet on a network interface. This function constructs
|
---|
| 770 | * the IP header and calculates the IP header checksum. If the source
|
---|
| 771 | * IP address is NULL, the IP address of the outgoing network
|
---|
| 772 | * interface is filled in as source address.
|
---|
| 773 | * If the destination IP address is LWIP_IP_HDRINCL, p is assumed to already
|
---|
| 774 | * include an IP header and p->payload points to it instead of the data.
|
---|
| 775 | *
|
---|
| 776 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 777 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 778 | IP header and p->payload points to that IP header)
|
---|
| 779 | * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the
|
---|
| 780 | * IP address of the netif used to send is used as source address)
|
---|
| 781 | * @param dest the destination IP address to send the packet to
|
---|
| 782 | * @param ttl the TTL value to be set in the IP header
|
---|
| 783 | * @param tos the TOS value to be set in the IP header
|
---|
| 784 | * @param proto the PROTOCOL to be set in the IP header
|
---|
| 785 | * @param netif the netif on which to send this packet
|
---|
| 786 | * @return ERR_OK if the packet was sent OK
|
---|
| 787 | * ERR_BUF if p doesn't have enough space for IP/LINK headers
|
---|
| 788 | * returns errors returned by netif->output
|
---|
| 789 | *
|
---|
| 790 | * @note ip_id: RFC791 "some host may be able to simply use
|
---|
| 791 | * unique identifiers independent of destination"
|
---|
| 792 | */
|
---|
| 793 | err_t
|
---|
| 794 | ip4_output_if(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 795 | u8_t ttl, u8_t tos,
|
---|
| 796 | u8_t proto, struct netif *netif)
|
---|
| 797 | {
|
---|
| 798 | #if IP_OPTIONS_SEND
|
---|
| 799 | return ip4_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
|
---|
| 800 | }
|
---|
| 801 |
|
---|
| 802 | /**
|
---|
| 803 | * Same as ip_output_if() but with the possibility to include IP options:
|
---|
| 804 | *
|
---|
| 805 | * @ param ip_options pointer to the IP options, copied into the IP header
|
---|
| 806 | * @ param optlen length of ip_options
|
---|
| 807 | */
|
---|
| 808 | err_t
|
---|
| 809 | ip4_output_if_opt(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 810 | u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
|
---|
| 811 | u16_t optlen)
|
---|
| 812 | {
|
---|
| 813 | #endif /* IP_OPTIONS_SEND */
|
---|
| 814 | const ip4_addr_t *src_used = src;
|
---|
| 815 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 816 | if (ip4_addr_isany(src)) {
|
---|
| 817 | src_used = netif_ip4_addr(netif);
|
---|
| 818 | }
|
---|
| 819 | }
|
---|
| 820 |
|
---|
| 821 | #if IP_OPTIONS_SEND
|
---|
| 822 | return ip4_output_if_opt_src(p, src_used, dest, ttl, tos, proto, netif,
|
---|
| 823 | ip_options, optlen);
|
---|
| 824 | #else /* IP_OPTIONS_SEND */
|
---|
| 825 | return ip4_output_if_src(p, src_used, dest, ttl, tos, proto, netif);
|
---|
| 826 | #endif /* IP_OPTIONS_SEND */
|
---|
| 827 | }
|
---|
| 828 |
|
---|
| 829 | /**
|
---|
| 830 | * Same as ip_output_if() but 'src' address is not replaced by netif address
|
---|
| 831 | * when it is 'any'.
|
---|
| 832 | */
|
---|
| 833 | err_t
|
---|
| 834 | ip4_output_if_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 835 | u8_t ttl, u8_t tos,
|
---|
| 836 | u8_t proto, struct netif *netif)
|
---|
| 837 | {
|
---|
| 838 | #if IP_OPTIONS_SEND
|
---|
| 839 | return ip4_output_if_opt_src(p, src, dest, ttl, tos, proto, netif, NULL, 0);
|
---|
| 840 | }
|
---|
| 841 |
|
---|
| 842 | /**
|
---|
| 843 | * Same as ip_output_if_opt() but 'src' address is not replaced by netif address
|
---|
| 844 | * when it is 'any'.
|
---|
| 845 | */
|
---|
| 846 | err_t
|
---|
| 847 | ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 848 | u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
|
---|
| 849 | u16_t optlen)
|
---|
| 850 | {
|
---|
| 851 | #endif /* IP_OPTIONS_SEND */
|
---|
| 852 | struct ip_hdr *iphdr;
|
---|
| 853 | ip4_addr_t dest_addr;
|
---|
| 854 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 855 | u32_t chk_sum = 0;
|
---|
| 856 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 857 |
|
---|
| 858 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 859 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 860 |
|
---|
| 861 | MIB2_STATS_INC(mib2.ipoutrequests);
|
---|
| 862 |
|
---|
| 863 | /* Should the IP header be generated or is it already included in p? */
|
---|
| 864 | if (dest != LWIP_IP_HDRINCL) {
|
---|
| 865 | u16_t ip_hlen = IP_HLEN;
|
---|
| 866 | #if IP_OPTIONS_SEND
|
---|
| 867 | u16_t optlen_aligned = 0;
|
---|
| 868 | if (optlen != 0) {
|
---|
| 869 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 870 | int i;
|
---|
| 871 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 872 | if (optlen > (IP_HLEN_MAX - IP_HLEN)) {
|
---|
| 873 | /* optlen too long */
|
---|
| 874 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output_if_opt: optlen too long\n"));
|
---|
| 875 | IP_STATS_INC(ip.err);
|
---|
| 876 | MIB2_STATS_INC(mib2.ipoutdiscards);
|
---|
| 877 | return ERR_VAL;
|
---|
| 878 | }
|
---|
| 879 | /* round up to a multiple of 4 */
|
---|
| 880 | optlen_aligned = (u16_t)((optlen + 3) & ~3);
|
---|
| 881 | ip_hlen = (u16_t)(ip_hlen + optlen_aligned);
|
---|
| 882 | /* First write in the IP options */
|
---|
| 883 | if (pbuf_add_header(p, optlen_aligned)) {
|
---|
| 884 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output_if_opt: not enough room for IP options in pbuf\n"));
|
---|
| 885 | IP_STATS_INC(ip.err);
|
---|
| 886 | MIB2_STATS_INC(mib2.ipoutdiscards);
|
---|
| 887 | return ERR_BUF;
|
---|
| 888 | }
|
---|
| 889 | MEMCPY(p->payload, ip_options, optlen);
|
---|
| 890 | if (optlen < optlen_aligned) {
|
---|
| 891 | /* zero the remaining bytes */
|
---|
| 892 | memset(((char *)p->payload) + optlen, 0, (size_t)(optlen_aligned - optlen));
|
---|
| 893 | }
|
---|
| 894 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 895 | for (i = 0; i < optlen_aligned / 2; i++) {
|
---|
| 896 | chk_sum += ((u16_t *)p->payload)[i];
|
---|
| 897 | }
|
---|
| 898 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 899 | }
|
---|
| 900 | #endif /* IP_OPTIONS_SEND */
|
---|
| 901 | /* generate IP header */
|
---|
| 902 | if (pbuf_add_header(p, IP_HLEN)) {
|
---|
| 903 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output: not enough room for IP header in pbuf\n"));
|
---|
| 904 |
|
---|
| 905 | IP_STATS_INC(ip.err);
|
---|
| 906 | MIB2_STATS_INC(mib2.ipoutdiscards);
|
---|
| 907 | return ERR_BUF;
|
---|
| 908 | }
|
---|
| 909 |
|
---|
| 910 | iphdr = (struct ip_hdr *)p->payload;
|
---|
| 911 | LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
|
---|
| 912 | (p->len >= sizeof(struct ip_hdr)));
|
---|
| 913 |
|
---|
| 914 | IPH_TTL_SET(iphdr, ttl);
|
---|
| 915 | IPH_PROTO_SET(iphdr, proto);
|
---|
| 916 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 917 | chk_sum += PP_NTOHS(proto | (ttl << 8));
|
---|
| 918 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 919 |
|
---|
| 920 | /* dest cannot be NULL here */
|
---|
| 921 | ip4_addr_copy(iphdr->dest, *dest);
|
---|
| 922 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 923 | chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
|
---|
| 924 | chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
|
---|
| 925 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 926 |
|
---|
| 927 | IPH_VHL_SET(iphdr, 4, ip_hlen / 4);
|
---|
| 928 | IPH_TOS_SET(iphdr, tos);
|
---|
| 929 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 930 | chk_sum += PP_NTOHS(tos | (iphdr->_v_hl << 8));
|
---|
| 931 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 932 | IPH_LEN_SET(iphdr, lwip_htons(p->tot_len));
|
---|
| 933 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 934 | chk_sum += iphdr->_len;
|
---|
| 935 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 936 | IPH_OFFSET_SET(iphdr, 0);
|
---|
| 937 | IPH_ID_SET(iphdr, lwip_htons(ip_id));
|
---|
| 938 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 939 | chk_sum += iphdr->_id;
|
---|
| 940 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 941 | ++ip_id;
|
---|
| 942 |
|
---|
| 943 | if (src == NULL) {
|
---|
| 944 | ip4_addr_copy(iphdr->src, *IP4_ADDR_ANY4);
|
---|
| 945 | } else {
|
---|
| 946 | /* src cannot be NULL here */
|
---|
| 947 | ip4_addr_copy(iphdr->src, *src);
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | #if CHECKSUM_GEN_IP_INLINE
|
---|
| 951 | chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
|
---|
| 952 | chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
|
---|
| 953 | chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
|
---|
| 954 | chk_sum = (chk_sum >> 16) + chk_sum;
|
---|
| 955 | chk_sum = ~chk_sum;
|
---|
| 956 | IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_IP) {
|
---|
| 957 | iphdr->_chksum = (u16_t)chk_sum; /* network order */
|
---|
| 958 | }
|
---|
| 959 | #if LWIP_CHECKSUM_CTRL_PER_NETIF
|
---|
| 960 | else {
|
---|
| 961 | IPH_CHKSUM_SET(iphdr, 0);
|
---|
| 962 | }
|
---|
| 963 | #endif /* LWIP_CHECKSUM_CTRL_PER_NETIF*/
|
---|
| 964 | #else /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 965 | IPH_CHKSUM_SET(iphdr, 0);
|
---|
| 966 | #if CHECKSUM_GEN_IP
|
---|
| 967 | IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_IP) {
|
---|
| 968 | IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
|
---|
| 969 | }
|
---|
| 970 | #endif /* CHECKSUM_GEN_IP */
|
---|
| 971 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
| 972 | } else {
|
---|
| 973 | /* IP header already included in p */
|
---|
| 974 | if (p->len < IP_HLEN) {
|
---|
| 975 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output: LWIP_IP_HDRINCL but pbuf is too short\n"));
|
---|
| 976 | IP_STATS_INC(ip.err);
|
---|
| 977 | MIB2_STATS_INC(mib2.ipoutdiscards);
|
---|
| 978 | return ERR_BUF;
|
---|
| 979 | }
|
---|
| 980 | iphdr = (struct ip_hdr *)p->payload;
|
---|
| 981 | ip4_addr_copy(dest_addr, iphdr->dest);
|
---|
| 982 | dest = &dest_addr;
|
---|
| 983 | }
|
---|
| 984 |
|
---|
| 985 | IP_STATS_INC(ip.xmit);
|
---|
| 986 |
|
---|
| 987 | LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num));
|
---|
| 988 | ip4_debug_print(p);
|
---|
| 989 |
|
---|
| 990 | #if ENABLE_LOOPBACK
|
---|
| 991 | if (ip4_addr_cmp(dest, netif_ip4_addr(netif))
|
---|
| 992 | #if !LWIP_HAVE_LOOPIF
|
---|
| 993 | || ip4_addr_isloopback(dest)
|
---|
| 994 | #endif /* !LWIP_HAVE_LOOPIF */
|
---|
| 995 | ) {
|
---|
| 996 | /* Packet to self, enqueue it for loopback */
|
---|
| 997 | LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
|
---|
| 998 | return netif_loop_output(netif, p);
|
---|
| 999 | }
|
---|
| 1000 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
| 1001 | if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
|
---|
| 1002 | netif_loop_output(netif, p);
|
---|
| 1003 | }
|
---|
| 1004 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 1005 | #endif /* ENABLE_LOOPBACK */
|
---|
| 1006 | #if IP_FRAG
|
---|
| 1007 | /* don't fragment if interface has mtu set to 0 [loopif] */
|
---|
| 1008 | if (netif->mtu && (p->tot_len > netif->mtu)) {
|
---|
| 1009 | return ip4_frag(p, netif, dest);
|
---|
| 1010 | }
|
---|
| 1011 | #endif /* IP_FRAG */
|
---|
| 1012 |
|
---|
| 1013 | LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: call netif->output()\n"));
|
---|
| 1014 | return netif->output(netif, p, dest);
|
---|
| 1015 | }
|
---|
| 1016 |
|
---|
| 1017 | /**
|
---|
| 1018 | * Simple interface to ip_output_if. It finds the outgoing network
|
---|
| 1019 | * interface and calls upon ip_output_if to do the actual work.
|
---|
| 1020 | *
|
---|
| 1021 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 1022 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 1023 | IP header and p->payload points to that IP header)
|
---|
| 1024 | * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the
|
---|
| 1025 | * IP address of the netif used to send is used as source address)
|
---|
| 1026 | * @param dest the destination IP address to send the packet to
|
---|
| 1027 | * @param ttl the TTL value to be set in the IP header
|
---|
| 1028 | * @param tos the TOS value to be set in the IP header
|
---|
| 1029 | * @param proto the PROTOCOL to be set in the IP header
|
---|
| 1030 | *
|
---|
| 1031 | * @return ERR_RTE if no route is found
|
---|
| 1032 | * see ip_output_if() for more return values
|
---|
| 1033 | */
|
---|
| 1034 | err_t
|
---|
| 1035 | ip4_output(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 1036 | u8_t ttl, u8_t tos, u8_t proto)
|
---|
| 1037 | {
|
---|
| 1038 | struct netif *netif;
|
---|
| 1039 |
|
---|
| 1040 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 1041 |
|
---|
| 1042 | if ((netif = ip4_route_src(src, dest)) == NULL) {
|
---|
| 1043 | LWIP_DEBUGF(IP_DEBUG, ("ip4_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
| 1044 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
|
---|
| 1045 | IP_STATS_INC(ip.rterr);
|
---|
| 1046 | return ERR_RTE;
|
---|
| 1047 | }
|
---|
| 1048 |
|
---|
| 1049 | return ip4_output_if(p, src, dest, ttl, tos, proto, netif);
|
---|
| 1050 | }
|
---|
| 1051 |
|
---|
| 1052 | #if LWIP_NETIF_USE_HINTS
|
---|
| 1053 | /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
|
---|
| 1054 | * before calling ip_output_if.
|
---|
| 1055 | *
|
---|
| 1056 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
| 1057 | protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
|
---|
| 1058 | IP header and p->payload points to that IP header)
|
---|
| 1059 | * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the
|
---|
| 1060 | * IP address of the netif used to send is used as source address)
|
---|
| 1061 | * @param dest the destination IP address to send the packet to
|
---|
| 1062 | * @param ttl the TTL value to be set in the IP header
|
---|
| 1063 | * @param tos the TOS value to be set in the IP header
|
---|
| 1064 | * @param proto the PROTOCOL to be set in the IP header
|
---|
| 1065 | * @param netif_hint netif output hint pointer set to netif->hint before
|
---|
| 1066 | * calling ip_output_if()
|
---|
| 1067 | *
|
---|
| 1068 | * @return ERR_RTE if no route is found
|
---|
| 1069 | * see ip_output_if() for more return values
|
---|
| 1070 | */
|
---|
| 1071 | err_t
|
---|
| 1072 | ip4_output_hinted(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
|
---|
| 1073 | u8_t ttl, u8_t tos, u8_t proto, struct netif_hint *netif_hint)
|
---|
| 1074 | {
|
---|
| 1075 | struct netif *netif;
|
---|
| 1076 | err_t err;
|
---|
| 1077 |
|
---|
| 1078 | LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
|
---|
| 1079 |
|
---|
| 1080 | if ((netif = ip4_route_src(src, dest)) == NULL) {
|
---|
| 1081 | LWIP_DEBUGF(IP_DEBUG, ("ip4_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
| 1082 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
|
---|
| 1083 | IP_STATS_INC(ip.rterr);
|
---|
| 1084 | return ERR_RTE;
|
---|
| 1085 | }
|
---|
| 1086 |
|
---|
| 1087 | NETIF_SET_HINTS(netif, netif_hint);
|
---|
| 1088 | err = ip4_output_if(p, src, dest, ttl, tos, proto, netif);
|
---|
| 1089 | NETIF_RESET_HINTS(netif);
|
---|
| 1090 |
|
---|
| 1091 | return err;
|
---|
| 1092 | }
|
---|
| 1093 | #endif /* LWIP_NETIF_USE_HINTS*/
|
---|
| 1094 |
|
---|
| 1095 | #if IP_DEBUG
|
---|
| 1096 | /* Print an IP header by using LWIP_DEBUGF
|
---|
| 1097 | * @param p an IP packet, p->payload pointing to the IP header
|
---|
| 1098 | */
|
---|
| 1099 | void
|
---|
| 1100 | ip4_debug_print(struct pbuf *p)
|
---|
| 1101 | {
|
---|
| 1102 | struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
|
---|
| 1103 |
|
---|
| 1104 | LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
|
---|
| 1105 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1106 | LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
|
---|
| 1107 | (u16_t)IPH_V(iphdr),
|
---|
| 1108 | (u16_t)IPH_HL(iphdr),
|
---|
| 1109 | (u16_t)IPH_TOS(iphdr),
|
---|
| 1110 | lwip_ntohs(IPH_LEN(iphdr))));
|
---|
| 1111 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1112 | LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
|
---|
| 1113 | lwip_ntohs(IPH_ID(iphdr)),
|
---|
| 1114 | (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 15 & 1),
|
---|
| 1115 | (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 14 & 1),
|
---|
| 1116 | (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 13 & 1),
|
---|
| 1117 | (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)));
|
---|
| 1118 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1119 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
|
---|
| 1120 | (u16_t)IPH_TTL(iphdr),
|
---|
| 1121 | (u16_t)IPH_PROTO(iphdr),
|
---|
| 1122 | lwip_ntohs(IPH_CHKSUM(iphdr))));
|
---|
| 1123 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1124 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
|
---|
| 1125 | ip4_addr1_16_val(iphdr->src),
|
---|
| 1126 | ip4_addr2_16_val(iphdr->src),
|
---|
| 1127 | ip4_addr3_16_val(iphdr->src),
|
---|
| 1128 | ip4_addr4_16_val(iphdr->src)));
|
---|
| 1129 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1130 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
|
---|
| 1131 | ip4_addr1_16_val(iphdr->dest),
|
---|
| 1132 | ip4_addr2_16_val(iphdr->dest),
|
---|
| 1133 | ip4_addr3_16_val(iphdr->dest),
|
---|
| 1134 | ip4_addr4_16_val(iphdr->dest)));
|
---|
| 1135 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1136 | }
|
---|
| 1137 | #endif /* IP_DEBUG */
|
---|
| 1138 |
|
---|
| 1139 | #endif /* LWIP_IPV4 */
|
---|