[457] | 1 | /**
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| 2 | * @file
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| 3 | * Implementation of raw protocol PCBs for low-level handling of
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| 4 | * different types of protocols besides (or overriding) those
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| 5 | * already available in lwIP.\n
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| 6 | * See also @ref raw_raw
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| 7 | *
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| 8 | * @defgroup raw_raw RAW
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| 9 | * @ingroup callbackstyle_api
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| 10 | * Implementation of raw protocol PCBs for low-level handling of
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| 11 | * different types of protocols besides (or overriding) those
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| 12 | * already available in lwIP.\n
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| 13 | * @see @ref api
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 18 | * All rights reserved.
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| 19 | *
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| 20 | * Redistribution and use in source and binary forms, with or without modification,
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| 21 | * are permitted provided that the following conditions are met:
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| 22 | *
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| 23 | * 1. Redistributions of source code must retain the above copyright notice,
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| 24 | * this list of conditions and the following disclaimer.
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| 25 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 26 | * this list of conditions and the following disclaimer in the documentation
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| 27 | * and/or other materials provided with the distribution.
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| 28 | * 3. The name of the author may not be used to endorse or promote products
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| 29 | * derived from this software without specific prior written permission.
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| 30 | *
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| 31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 32 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 33 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 34 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 35 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 36 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 39 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 40 | * OF SUCH DAMAGE.
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| 41 | *
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| 42 | * This file is part of the lwIP TCP/IP stack.
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| 43 | *
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| 44 | * Author: Adam Dunkels <adam@sics.se>
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| 45 | *
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| 46 | */
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| 47 |
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| 48 | #include "lwip/opt.h"
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| 49 |
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| 50 | #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
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| 51 |
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| 52 | #include "lwip/def.h"
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| 53 | #include "lwip/memp.h"
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| 54 | #include "lwip/ip_addr.h"
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| 55 | #include "lwip/netif.h"
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| 56 | #include "lwip/raw.h"
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| 57 | #include "lwip/priv/raw_priv.h"
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| 58 | #include "lwip/stats.h"
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| 59 | #include "lwip/ip6.h"
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| 60 | #include "lwip/ip6_addr.h"
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| 61 | #include "lwip/inet_chksum.h"
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| 62 |
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| 63 | #include <string.h>
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| 64 |
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| 65 | /** The list of RAW PCBs */
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| 66 | static struct raw_pcb *raw_pcbs;
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| 67 |
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| 68 | static u8_t
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| 69 | raw_input_local_match(struct raw_pcb *pcb, u8_t broadcast)
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| 70 | {
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| 71 | LWIP_UNUSED_ARG(broadcast); /* in IPv6 only case */
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| 72 |
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| 73 | /* check if PCB is bound to specific netif */
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| 74 | if ((pcb->netif_idx != NETIF_NO_INDEX) &&
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| 75 | (pcb->netif_idx != netif_get_index(ip_data.current_input_netif))) {
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | #if LWIP_IPV4 && LWIP_IPV6
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| 80 | /* Dual-stack: PCBs listening to any IP type also listen to any IP address */
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| 81 | if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
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| 82 | #if IP_SOF_BROADCAST_RECV
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| 83 | if ((broadcast != 0) && !ip_get_option(pcb, SOF_BROADCAST)) {
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| 84 | return 0;
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| 85 | }
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| 86 | #endif /* IP_SOF_BROADCAST_RECV */
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| 87 | return 1;
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| 88 | }
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| 89 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
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| 90 |
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| 91 | /* Only need to check PCB if incoming IP version matches PCB IP version */
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| 92 | if (IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ip_current_dest_addr())) {
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| 93 | #if LWIP_IPV4
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| 94 | /* Special case: IPv4 broadcast: receive all broadcasts
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| 95 | * Note: broadcast variable can only be 1 if it is an IPv4 broadcast */
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| 96 | if (broadcast != 0) {
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| 97 | #if IP_SOF_BROADCAST_RECV
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| 98 | if (ip_get_option(pcb, SOF_BROADCAST))
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| 99 | #endif /* IP_SOF_BROADCAST_RECV */
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| 100 | {
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| 101 | if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) {
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| 102 | return 1;
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| 103 | }
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| 104 | }
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| 105 | } else
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| 106 | #endif /* LWIP_IPV4 */
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| 107 | /* Handle IPv4 and IPv6: catch all or exact match */
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| 108 | if (ip_addr_isany(&pcb->local_ip) ||
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| 109 | ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) {
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| 110 | return 1;
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| 111 | }
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| 112 | }
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| 113 |
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| 114 | return 0;
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| 115 | }
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| 116 |
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| 117 | /**
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| 118 | * Determine if in incoming IP packet is covered by a RAW PCB
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| 119 | * and if so, pass it to a user-provided receive callback function.
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| 120 | *
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| 121 | * Given an incoming IP datagram (as a chain of pbufs) this function
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| 122 | * finds a corresponding RAW PCB and calls the corresponding receive
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| 123 | * callback function.
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| 124 | *
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| 125 | * @param p pbuf to be demultiplexed to a RAW PCB.
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| 126 | * @param inp network interface on which the datagram was received.
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| 127 | * @return - 1 if the packet has been eaten by a RAW PCB receive
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| 128 | * callback function. The caller MAY NOT not reference the
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| 129 | * packet any longer, and MAY NOT call pbuf_free().
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| 130 | * @return - 0 if packet is not eaten (pbuf is still referenced by the
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| 131 | * caller).
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| 132 | *
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| 133 | */
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| 134 | raw_input_state_t
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| 135 | raw_input(struct pbuf *p, struct netif *inp)
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| 136 | {
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| 137 | struct raw_pcb *pcb, *prev;
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| 138 | s16_t proto;
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| 139 | raw_input_state_t ret = RAW_INPUT_NONE;
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| 140 | u8_t broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), ip_current_netif());
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| 141 |
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| 142 | LWIP_UNUSED_ARG(inp);
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| 143 |
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| 144 | #if LWIP_IPV6
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| 145 | #if LWIP_IPV4
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| 146 | if (IP_HDR_GET_VERSION(p->payload) == 6)
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| 147 | #endif /* LWIP_IPV4 */
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| 148 | {
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| 149 | struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
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| 150 | proto = IP6H_NEXTH(ip6hdr);
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| 151 | }
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| 152 | #if LWIP_IPV4
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| 153 | else
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| 154 | #endif /* LWIP_IPV4 */
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| 155 | #endif /* LWIP_IPV6 */
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| 156 | #if LWIP_IPV4
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| 157 | {
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| 158 | proto = IPH_PROTO((struct ip_hdr *)p->payload);
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| 159 | }
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| 160 | #endif /* LWIP_IPV4 */
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| 161 |
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| 162 | prev = NULL;
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| 163 | pcb = raw_pcbs;
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| 164 | /* loop through all raw pcbs until the packet is eaten by one */
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| 165 | /* this allows multiple pcbs to match against the packet by design */
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| 166 | while (pcb != NULL) {
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| 167 | if ((pcb->protocol == proto) && raw_input_local_match(pcb, broadcast) &&
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| 168 | (((pcb->flags & RAW_FLAGS_CONNECTED) == 0) ||
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| 169 | ip_addr_cmp(&pcb->remote_ip, ip_current_src_addr()))) {
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| 170 | /* receive callback function available? */
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| 171 | if (pcb->recv != NULL) {
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| 172 | u8_t eaten;
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| 173 | #ifndef LWIP_NOASSERT
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| 174 | void *old_payload = p->payload;
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| 175 | #endif
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| 176 | ret = RAW_INPUT_DELIVERED;
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| 177 | /* the receive callback function did not eat the packet? */
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| 178 | eaten = pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr());
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| 179 | if (eaten != 0) {
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| 180 | /* receive function ate the packet */
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| 181 | p = NULL;
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| 182 | if (prev != NULL) {
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| 183 | /* move the pcb to the front of raw_pcbs so that is
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| 184 | found faster next time */
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| 185 | prev->next = pcb->next;
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| 186 | pcb->next = raw_pcbs;
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| 187 | raw_pcbs = pcb;
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| 188 | }
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| 189 | return RAW_INPUT_EATEN;
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| 190 | } else {
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| 191 | /* sanity-check that the receive callback did not alter the pbuf */
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| 192 | LWIP_ASSERT("raw pcb recv callback altered pbuf payload pointer without eating packet",
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| 193 | p->payload == old_payload);
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| 194 | }
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| 195 | }
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| 196 | /* no receive callback function was set for this raw PCB */
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| 197 | }
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| 198 | /* drop the packet */
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| 199 | prev = pcb;
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| 200 | pcb = pcb->next;
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| 201 | }
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| 202 | return ret;
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| 203 | }
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| 204 |
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| 205 | /**
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| 206 | * @ingroup raw_raw
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| 207 | * Bind a RAW PCB.
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| 208 | *
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| 209 | * @param pcb RAW PCB to be bound with a local address ipaddr.
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| 210 | * @param ipaddr local IP address to bind with. Use IP4_ADDR_ANY to
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| 211 | * bind to all local interfaces.
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| 212 | *
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| 213 | * @return lwIP error code.
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| 214 | * - ERR_OK. Successful. No error occurred.
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| 215 | * - ERR_USE. The specified IP address is already bound to by
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| 216 | * another RAW PCB.
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| 217 | *
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| 218 | * @see raw_disconnect()
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| 219 | */
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| 220 | err_t
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| 221 | raw_bind(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
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| 222 | {
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| 223 | LWIP_ASSERT_CORE_LOCKED();
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| 224 | if ((pcb == NULL) || (ipaddr == NULL)) {
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| 225 | return ERR_VAL;
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| 226 | }
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| 227 | ip_addr_set_ipaddr(&pcb->local_ip, ipaddr);
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| 228 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
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| 229 | /* If the given IP address should have a zone but doesn't, assign one now.
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| 230 | * This is legacy support: scope-aware callers should always provide properly
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| 231 | * zoned source addresses. */
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| 232 | if (IP_IS_V6(&pcb->local_ip) &&
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| 233 | ip6_addr_lacks_zone(ip_2_ip6(&pcb->local_ip), IP6_UNKNOWN)) {
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| 234 | ip6_addr_select_zone(ip_2_ip6(&pcb->local_ip), ip_2_ip6(&pcb->local_ip));
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| 235 | }
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| 236 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
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| 237 | return ERR_OK;
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| 238 | }
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| 239 |
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| 240 | /**
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| 241 | * @ingroup raw_raw
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| 242 | * Bind an RAW PCB to a specific netif.
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| 243 | * After calling this function, all packets received via this PCB
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| 244 | * are guaranteed to have come in via the specified netif, and all
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| 245 | * outgoing packets will go out via the specified netif.
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| 246 | *
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| 247 | * @param pcb RAW PCB to be bound with netif.
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| 248 | * @param netif netif to bind to. Can be NULL.
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| 249 | *
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| 250 | * @see raw_disconnect()
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| 251 | */
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| 252 | void
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| 253 | raw_bind_netif(struct raw_pcb *pcb, const struct netif *netif)
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| 254 | {
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| 255 | LWIP_ASSERT_CORE_LOCKED();
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| 256 | if (netif != NULL) {
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| 257 | pcb->netif_idx = netif_get_index(netif);
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| 258 | } else {
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| 259 | pcb->netif_idx = NETIF_NO_INDEX;
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| 260 | }
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| 261 | }
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| 262 |
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| 263 | /**
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| 264 | * @ingroup raw_raw
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| 265 | * Connect an RAW PCB. This function is required by upper layers
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| 266 | * of lwip. Using the raw api you could use raw_sendto() instead
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| 267 | *
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| 268 | * This will associate the RAW PCB with the remote address.
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| 269 | *
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| 270 | * @param pcb RAW PCB to be connected with remote address ipaddr and port.
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| 271 | * @param ipaddr remote IP address to connect with.
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| 272 | *
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| 273 | * @return lwIP error code
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| 274 | *
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| 275 | * @see raw_disconnect() and raw_sendto()
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| 276 | */
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| 277 | err_t
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| 278 | raw_connect(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
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| 279 | {
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| 280 | LWIP_ASSERT_CORE_LOCKED();
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| 281 | if ((pcb == NULL) || (ipaddr == NULL)) {
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| 282 | return ERR_VAL;
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| 283 | }
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| 284 | ip_addr_set_ipaddr(&pcb->remote_ip, ipaddr);
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| 285 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
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| 286 | /* If the given IP address should have a zone but doesn't, assign one now,
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| 287 | * using the bound address to make a more informed decision when possible. */
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| 288 | if (IP_IS_V6(&pcb->remote_ip) &&
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| 289 | ip6_addr_lacks_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNKNOWN)) {
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| 290 | ip6_addr_select_zone(ip_2_ip6(&pcb->remote_ip), ip_2_ip6(&pcb->local_ip));
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| 291 | }
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| 292 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
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| 293 | raw_set_flags(pcb, RAW_FLAGS_CONNECTED);
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| 294 | return ERR_OK;
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| 295 | }
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| 296 |
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| 297 | /**
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| 298 | * @ingroup raw_raw
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| 299 | * Disconnect a RAW PCB.
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| 300 | *
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| 301 | * @param pcb the raw pcb to disconnect.
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| 302 | */
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| 303 | void
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| 304 | raw_disconnect(struct raw_pcb *pcb)
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| 305 | {
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| 306 | LWIP_ASSERT_CORE_LOCKED();
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| 307 | /* reset remote address association */
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| 308 | #if LWIP_IPV4 && LWIP_IPV6
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| 309 | if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
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| 310 | ip_addr_copy(pcb->remote_ip, *IP_ANY_TYPE);
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| 311 | } else {
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| 312 | #endif
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| 313 | ip_addr_set_any(IP_IS_V6_VAL(pcb->remote_ip), &pcb->remote_ip);
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| 314 | #if LWIP_IPV4 && LWIP_IPV6
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| 315 | }
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| 316 | #endif
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| 317 | pcb->netif_idx = NETIF_NO_INDEX;
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| 318 | /* mark PCB as unconnected */
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| 319 | raw_clear_flags(pcb, RAW_FLAGS_CONNECTED);
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| 320 | }
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| 321 |
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| 322 | /**
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| 323 | * @ingroup raw_raw
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| 324 | * Set the callback function for received packets that match the
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| 325 | * raw PCB's protocol and binding.
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| 326 | *
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| 327 | * The callback function MUST either
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| 328 | * - eat the packet by calling pbuf_free() and returning non-zero. The
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| 329 | * packet will not be passed to other raw PCBs or other protocol layers.
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| 330 | * - not free the packet, and return zero. The packet will be matched
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| 331 | * against further PCBs and/or forwarded to another protocol layers.
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| 332 | */
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| 333 | void
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| 334 | raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
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| 335 | {
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| 336 | LWIP_ASSERT_CORE_LOCKED();
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| 337 | /* remember recv() callback and user data */
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| 338 | pcb->recv = recv;
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| 339 | pcb->recv_arg = recv_arg;
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| 340 | }
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| 341 |
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| 342 | /**
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| 343 | * @ingroup raw_raw
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| 344 | * Send the raw IP packet to the given address. An IP header will be prepended
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| 345 | * to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that
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| 346 | * case, the packet must include an IP header, which will then be sent as is.
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| 347 | *
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| 348 | * @param pcb the raw pcb which to send
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| 349 | * @param p the IP payload to send
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| 350 | * @param ipaddr the destination address of the IP packet
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| 351 | *
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| 352 | */
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| 353 | err_t
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| 354 | raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr)
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| 355 | {
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| 356 | struct netif *netif;
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| 357 | const ip_addr_t *src_ip;
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| 358 |
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| 359 | if ((pcb == NULL) || (ipaddr == NULL) || !IP_ADDR_PCB_VERSION_MATCH(pcb, ipaddr)) {
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| 360 | return ERR_VAL;
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| 361 | }
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| 362 |
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| 363 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
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| 364 |
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| 365 | if (pcb->netif_idx != NETIF_NO_INDEX) {
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| 366 | netif = netif_get_by_index(pcb->netif_idx);
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| 367 | } else {
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| 368 | #if LWIP_MULTICAST_TX_OPTIONS
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| 369 | netif = NULL;
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| 370 | if (ip_addr_ismulticast(ipaddr)) {
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| 371 | /* For multicast-destined packets, use the user-provided interface index to
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| 372 | * determine the outgoing interface, if an interface index is set and a
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| 373 | * matching netif can be found. Otherwise, fall back to regular routing. */
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| 374 | netif = netif_get_by_index(pcb->mcast_ifindex);
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| 375 | }
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| 376 |
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| 377 | if (netif == NULL)
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| 378 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
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| 379 | {
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| 380 | netif = ip_route(&pcb->local_ip, ipaddr);
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| 381 | }
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| 382 | }
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| 383 |
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| 384 | if (netif == NULL) {
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| 385 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to "));
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| 386 | ip_addr_debug_print(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ipaddr);
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| 387 | return ERR_RTE;
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| 388 | }
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| 389 |
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| 390 | if (ip_addr_isany(&pcb->local_ip) || ip_addr_ismulticast(&pcb->local_ip)) {
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| 391 | /* use outgoing network interface IP address as source address */
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| 392 | src_ip = ip_netif_get_local_ip(netif, ipaddr);
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| 393 | #if LWIP_IPV6
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| 394 | if (src_ip == NULL) {
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| 395 | return ERR_RTE;
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| 396 | }
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| 397 | #endif /* LWIP_IPV6 */
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| 398 | } else {
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| 399 | /* use RAW PCB local IP address as source address */
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| 400 | src_ip = &pcb->local_ip;
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| 401 | }
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| 402 |
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| 403 | return raw_sendto_if_src(pcb, p, ipaddr, netif, src_ip);
|
---|
| 404 | }
|
---|
| 405 |
|
---|
| 406 | /**
|
---|
| 407 | * @ingroup raw_raw
|
---|
| 408 | * Send the raw IP packet to the given address, using a particular outgoing
|
---|
| 409 | * netif and source IP address. An IP header will be prepended to the packet,
|
---|
| 410 | * unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the
|
---|
| 411 | * packet must include an IP header, which will then be sent as is.
|
---|
| 412 | *
|
---|
| 413 | * @param pcb RAW PCB used to send the data
|
---|
| 414 | * @param p chain of pbufs to be sent
|
---|
| 415 | * @param dst_ip destination IP address
|
---|
| 416 | * @param netif the netif used for sending
|
---|
| 417 | * @param src_ip source IP address
|
---|
| 418 | */
|
---|
| 419 | err_t
|
---|
| 420 | raw_sendto_if_src(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip,
|
---|
| 421 | struct netif *netif, const ip_addr_t *src_ip)
|
---|
| 422 | {
|
---|
| 423 | err_t err;
|
---|
| 424 | struct pbuf *q; /* q will be sent down the stack */
|
---|
| 425 | u16_t header_size;
|
---|
| 426 | u8_t ttl;
|
---|
| 427 |
|
---|
| 428 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 429 |
|
---|
| 430 | if ((pcb == NULL) || (dst_ip == NULL) || (netif == NULL) || (src_ip == NULL) ||
|
---|
| 431 | !IP_ADDR_PCB_VERSION_MATCH(pcb, src_ip) || !IP_ADDR_PCB_VERSION_MATCH(pcb, dst_ip)) {
|
---|
| 432 | return ERR_VAL;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | header_size = (
|
---|
| 436 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
| 437 | IP_IS_V6(dst_ip) ? IP6_HLEN : IP_HLEN);
|
---|
| 438 | #elif LWIP_IPV4
|
---|
| 439 | IP_HLEN);
|
---|
| 440 | #else
|
---|
| 441 | IP6_HLEN);
|
---|
| 442 | #endif
|
---|
| 443 |
|
---|
| 444 | /* Handle the HDRINCL option as an exception: none of the code below applies
|
---|
| 445 | * to this case, and sending the packet needs to be done differently too. */
|
---|
| 446 | if (pcb->flags & RAW_FLAGS_HDRINCL) {
|
---|
| 447 | /* A full header *must* be present in the first pbuf of the chain, as the
|
---|
| 448 | * output routines may access its fields directly. */
|
---|
| 449 | if (p->len < header_size) {
|
---|
| 450 | return ERR_VAL;
|
---|
| 451 | }
|
---|
| 452 | /* @todo multicast loop support, if at all desired for this scenario.. */
|
---|
| 453 | NETIF_SET_HINTS(netif, &pcb->netif_hints);
|
---|
| 454 | err = ip_output_if_hdrincl(p, src_ip, dst_ip, netif);
|
---|
| 455 | NETIF_RESET_HINTS(netif);
|
---|
| 456 | return err;
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | /* packet too large to add an IP header without causing an overflow? */
|
---|
| 460 | if ((u16_t)(p->tot_len + header_size) < p->tot_len) {
|
---|
| 461 | return ERR_MEM;
|
---|
| 462 | }
|
---|
| 463 | /* not enough space to add an IP header to first pbuf in given p chain? */
|
---|
| 464 | if (pbuf_add_header(p, header_size)) {
|
---|
| 465 | /* allocate header in new pbuf */
|
---|
| 466 | q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
|
---|
| 467 | /* new header pbuf could not be allocated? */
|
---|
| 468 | if (q == NULL) {
|
---|
| 469 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
|
---|
| 470 | return ERR_MEM;
|
---|
| 471 | }
|
---|
| 472 | if (p->tot_len != 0) {
|
---|
| 473 | /* chain header q in front of given pbuf p */
|
---|
| 474 | pbuf_chain(q, p);
|
---|
| 475 | }
|
---|
| 476 | /* { first pbuf q points to header pbuf } */
|
---|
| 477 | LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
|
---|
| 478 | } else {
|
---|
| 479 | /* first pbuf q equals given pbuf */
|
---|
| 480 | q = p;
|
---|
| 481 | if (pbuf_remove_header(q, header_size)) {
|
---|
| 482 | LWIP_ASSERT("Can't restore header we just removed!", 0);
|
---|
| 483 | return ERR_MEM;
|
---|
| 484 | }
|
---|
| 485 | }
|
---|
| 486 |
|
---|
| 487 | #if IP_SOF_BROADCAST
|
---|
| 488 | if (IP_IS_V4(dst_ip)) {
|
---|
| 489 | /* broadcast filter? */
|
---|
| 490 | if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
|
---|
| 491 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
|
---|
| 492 | /* free any temporary header pbuf allocated by pbuf_header() */
|
---|
| 493 | if (q != p) {
|
---|
| 494 | pbuf_free(q);
|
---|
| 495 | }
|
---|
| 496 | return ERR_VAL;
|
---|
| 497 | }
|
---|
| 498 | }
|
---|
| 499 | #endif /* IP_SOF_BROADCAST */
|
---|
| 500 |
|
---|
| 501 | /* Multicast Loop? */
|
---|
| 502 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
| 503 | if (((pcb->flags & RAW_FLAGS_MULTICAST_LOOP) != 0) && ip_addr_ismulticast(dst_ip)) {
|
---|
| 504 | q->flags |= PBUF_FLAG_MCASTLOOP;
|
---|
| 505 | }
|
---|
| 506 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 507 |
|
---|
| 508 | #if LWIP_IPV6
|
---|
| 509 | /* If requested, based on the IPV6_CHECKSUM socket option per RFC3542,
|
---|
| 510 | compute the checksum and update the checksum in the payload. */
|
---|
| 511 | if (IP_IS_V6(dst_ip) && pcb->chksum_reqd) {
|
---|
| 512 | u16_t chksum = ip6_chksum_pseudo(p, pcb->protocol, p->tot_len, ip_2_ip6(src_ip), ip_2_ip6(dst_ip));
|
---|
| 513 | LWIP_ASSERT("Checksum must fit into first pbuf", p->len >= (pcb->chksum_offset + 2));
|
---|
| 514 | SMEMCPY(((u8_t *)p->payload) + pcb->chksum_offset, &chksum, sizeof(u16_t));
|
---|
| 515 | }
|
---|
| 516 | #endif
|
---|
| 517 |
|
---|
| 518 | /* Determine TTL to use */
|
---|
| 519 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
| 520 | ttl = (ip_addr_ismulticast(dst_ip) ? raw_get_multicast_ttl(pcb) : pcb->ttl);
|
---|
| 521 | #else /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 522 | ttl = pcb->ttl;
|
---|
| 523 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 524 |
|
---|
| 525 | NETIF_SET_HINTS(netif, &pcb->netif_hints);
|
---|
| 526 | err = ip_output_if(q, src_ip, dst_ip, ttl, pcb->tos, pcb->protocol, netif);
|
---|
| 527 | NETIF_RESET_HINTS(netif);
|
---|
| 528 |
|
---|
| 529 | /* did we chain a header earlier? */
|
---|
| 530 | if (q != p) {
|
---|
| 531 | /* free the header */
|
---|
| 532 | pbuf_free(q);
|
---|
| 533 | }
|
---|
| 534 | return err;
|
---|
| 535 | }
|
---|
| 536 |
|
---|
| 537 | /**
|
---|
| 538 | * @ingroup raw_raw
|
---|
| 539 | * Send the raw IP packet to the address given by raw_connect()
|
---|
| 540 | *
|
---|
| 541 | * @param pcb the raw pcb which to send
|
---|
| 542 | * @param p the IP payload to send
|
---|
| 543 | *
|
---|
| 544 | */
|
---|
| 545 | err_t
|
---|
| 546 | raw_send(struct raw_pcb *pcb, struct pbuf *p)
|
---|
| 547 | {
|
---|
| 548 | return raw_sendto(pcb, p, &pcb->remote_ip);
|
---|
| 549 | }
|
---|
| 550 |
|
---|
| 551 | /**
|
---|
| 552 | * @ingroup raw_raw
|
---|
| 553 | * Remove an RAW PCB.
|
---|
| 554 | *
|
---|
| 555 | * @param pcb RAW PCB to be removed. The PCB is removed from the list of
|
---|
| 556 | * RAW PCB's and the data structure is freed from memory.
|
---|
| 557 | *
|
---|
| 558 | * @see raw_new()
|
---|
| 559 | */
|
---|
| 560 | void
|
---|
| 561 | raw_remove(struct raw_pcb *pcb)
|
---|
| 562 | {
|
---|
| 563 | struct raw_pcb *pcb2;
|
---|
| 564 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 565 | /* pcb to be removed is first in list? */
|
---|
| 566 | if (raw_pcbs == pcb) {
|
---|
| 567 | /* make list start at 2nd pcb */
|
---|
| 568 | raw_pcbs = raw_pcbs->next;
|
---|
| 569 | /* pcb not 1st in list */
|
---|
| 570 | } else {
|
---|
| 571 | for (pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
|
---|
| 572 | /* find pcb in raw_pcbs list */
|
---|
| 573 | if (pcb2->next != NULL && pcb2->next == pcb) {
|
---|
| 574 | /* remove pcb from list */
|
---|
| 575 | pcb2->next = pcb->next;
|
---|
| 576 | break;
|
---|
| 577 | }
|
---|
| 578 | }
|
---|
| 579 | }
|
---|
| 580 | memp_free(MEMP_RAW_PCB, pcb);
|
---|
| 581 | }
|
---|
| 582 |
|
---|
| 583 | /**
|
---|
| 584 | * @ingroup raw_raw
|
---|
| 585 | * Create a RAW PCB.
|
---|
| 586 | *
|
---|
| 587 | * @return The RAW PCB which was created. NULL if the PCB data structure
|
---|
| 588 | * could not be allocated.
|
---|
| 589 | *
|
---|
| 590 | * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
|
---|
| 591 | *
|
---|
| 592 | * @see raw_remove()
|
---|
| 593 | */
|
---|
| 594 | struct raw_pcb *
|
---|
| 595 | raw_new(u8_t proto)
|
---|
| 596 | {
|
---|
| 597 | struct raw_pcb *pcb;
|
---|
| 598 |
|
---|
| 599 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
|
---|
| 600 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 601 |
|
---|
| 602 | pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
|
---|
| 603 | /* could allocate RAW PCB? */
|
---|
| 604 | if (pcb != NULL) {
|
---|
| 605 | /* initialize PCB to all zeroes */
|
---|
| 606 | memset(pcb, 0, sizeof(struct raw_pcb));
|
---|
| 607 | pcb->protocol = proto;
|
---|
| 608 | pcb->ttl = RAW_TTL;
|
---|
| 609 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
| 610 | raw_set_multicast_ttl(pcb, RAW_TTL);
|
---|
| 611 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
| 612 | pcb->next = raw_pcbs;
|
---|
| 613 | raw_pcbs = pcb;
|
---|
| 614 | }
|
---|
| 615 | return pcb;
|
---|
| 616 | }
|
---|
| 617 |
|
---|
| 618 | /**
|
---|
| 619 | * @ingroup raw_raw
|
---|
| 620 | * Create a RAW PCB for specific IP type.
|
---|
| 621 | *
|
---|
| 622 | * @return The RAW PCB which was created. NULL if the PCB data structure
|
---|
| 623 | * could not be allocated.
|
---|
| 624 | *
|
---|
| 625 | * @param type IP address type, see @ref lwip_ip_addr_type definitions.
|
---|
| 626 | * If you want to listen to IPv4 and IPv6 (dual-stack) packets,
|
---|
| 627 | * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE.
|
---|
| 628 | * @param proto the protocol number (next header) of the IPv6 packet payload
|
---|
| 629 | * (e.g. IP6_NEXTH_ICMP6)
|
---|
| 630 | *
|
---|
| 631 | * @see raw_remove()
|
---|
| 632 | */
|
---|
| 633 | struct raw_pcb *
|
---|
| 634 | raw_new_ip_type(u8_t type, u8_t proto)
|
---|
| 635 | {
|
---|
| 636 | struct raw_pcb *pcb;
|
---|
| 637 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 638 | pcb = raw_new(proto);
|
---|
| 639 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
| 640 | if (pcb != NULL) {
|
---|
| 641 | IP_SET_TYPE_VAL(pcb->local_ip, type);
|
---|
| 642 | IP_SET_TYPE_VAL(pcb->remote_ip, type);
|
---|
| 643 | }
|
---|
| 644 | #else /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
| 645 | LWIP_UNUSED_ARG(type);
|
---|
| 646 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
| 647 | return pcb;
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | /** This function is called from netif.c when address is changed
|
---|
| 651 | *
|
---|
| 652 | * @param old_addr IP address of the netif before change
|
---|
| 653 | * @param new_addr IP address of the netif after change
|
---|
| 654 | */
|
---|
| 655 | void raw_netif_ip_addr_changed(const ip_addr_t *old_addr, const ip_addr_t *new_addr)
|
---|
| 656 | {
|
---|
| 657 | struct raw_pcb *rpcb;
|
---|
| 658 |
|
---|
| 659 | if (!ip_addr_isany(old_addr) && !ip_addr_isany(new_addr)) {
|
---|
| 660 | for (rpcb = raw_pcbs; rpcb != NULL; rpcb = rpcb->next) {
|
---|
| 661 | /* PCB bound to current local interface address? */
|
---|
| 662 | if (ip_addr_cmp(&rpcb->local_ip, old_addr)) {
|
---|
| 663 | /* The PCB is bound to the old ipaddr and
|
---|
| 664 | * is set to bound to the new one instead */
|
---|
| 665 | ip_addr_copy(rpcb->local_ip, *new_addr);
|
---|
| 666 | }
|
---|
| 667 | }
|
---|
| 668 | }
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | #endif /* LWIP_RAW */
|
---|