[164] | 1 | /**
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| 2 | * @file
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| 3 | * User Datagram Protocol module
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| 4 | *
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Adam Dunkels <adam@sics.se>
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| 36 | *
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| 37 | */
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| 38 |
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| 39 |
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| 40 | /* udp.c
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| 41 | *
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| 42 | * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
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| 43 | *
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| 44 | */
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| 45 |
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| 46 | /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
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| 47 | */
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| 48 |
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| 49 | #include "lwip/opt.h"
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| 50 |
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| 51 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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| 52 |
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| 53 | #include "lwip/udp.h"
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| 54 | #include "lwip/def.h"
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| 55 | #include "lwip/memp.h"
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| 56 | #include "lwip/inet_chksum.h"
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| 57 | #include "lwip/ip_addr.h"
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| 58 | #include "lwip/netif.h"
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| 59 | #include "lwip/icmp.h"
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| 60 | #include "lwip/stats.h"
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| 61 | #include "lwip/snmp.h"
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| 62 | #include "arch/perf.h"
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| 63 | #include "lwip/dhcp.h"
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| 64 |
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| 65 | #include <string.h>
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| 66 |
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| 67 | #ifndef UDP_LOCAL_PORT_RANGE_START
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| 68 | /* From http://www.iana.org/assignments/port-numbers:
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| 69 | "The Dynamic and/or Private Ports are those from 49152 through 65535" */
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| 70 | #define UDP_LOCAL_PORT_RANGE_START 0xc000
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| 71 | #define UDP_LOCAL_PORT_RANGE_END 0xffff
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| 72 | #define UDP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~UDP_LOCAL_PORT_RANGE_START) + UDP_LOCAL_PORT_RANGE_START)
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| 73 | #endif
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| 74 |
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| 75 | /* last local UDP port */
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| 76 | static u16_t udp_port = UDP_LOCAL_PORT_RANGE_START;
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| 77 |
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| 78 | /* The list of UDP PCBs */
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| 79 | /* exported in udp.h (was static) */
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| 80 | struct udp_pcb *udp_pcbs;
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| 81 |
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| 82 | /**
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| 83 | * Initialize this module.
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| 84 | */
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| 85 | void
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| 86 | udp_init(void)
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| 87 | {
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| 88 | #if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
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| 89 | udp_port = UDP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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| 90 | #endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
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| 91 | }
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| 92 |
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| 93 | /**
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| 94 | * Allocate a new local UDP port.
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| 95 | *
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| 96 | * @return a new (free) local UDP port number
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| 97 | */
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| 98 | static u16_t
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| 99 | udp_new_port(void)
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| 100 | {
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| 101 | u16_t n = 0;
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| 102 | struct udp_pcb *pcb;
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| 103 |
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| 104 | again:
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| 105 | if (udp_port++ == UDP_LOCAL_PORT_RANGE_END) {
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| 106 | udp_port = UDP_LOCAL_PORT_RANGE_START;
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| 107 | }
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| 108 | /* Check all PCBs. */
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| 109 | for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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| 110 | if (pcb->local_port == udp_port) {
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| 111 | if (++n > (UDP_LOCAL_PORT_RANGE_END - UDP_LOCAL_PORT_RANGE_START)) {
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| 112 | return 0;
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| 113 | }
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| 114 | goto again;
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| 115 | }
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| 116 | }
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| 117 | return udp_port;
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| 118 | #if 0
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| 119 | struct udp_pcb *ipcb = udp_pcbs;
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| 120 | while ((ipcb != NULL) && (udp_port != UDP_LOCAL_PORT_RANGE_END)) {
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| 121 | if (ipcb->local_port == udp_port) {
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| 122 | /* port is already used by another udp_pcb */
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| 123 | udp_port++;
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| 124 | /* restart scanning all udp pcbs */
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| 125 | ipcb = udp_pcbs;
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| 126 | } else {
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| 127 | /* go on with next udp pcb */
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| 128 | ipcb = ipcb->next;
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| 129 | }
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| 130 | }
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| 131 | if (ipcb != NULL) {
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| 132 | return 0;
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| 133 | }
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| 134 | return udp_port;
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| 135 | #endif
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| 136 | }
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| 137 |
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| 138 | /**
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| 139 | * Process an incoming UDP datagram.
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| 140 | *
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| 141 | * Given an incoming UDP datagram (as a chain of pbufs) this function
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| 142 | * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
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| 143 | * recv function. If no pcb is found or the datagram is incorrect, the
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| 144 | * pbuf is freed.
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| 145 | *
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| 146 | * @param p pbuf to be demultiplexed to a UDP PCB.
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| 147 | * @param inp network interface on which the datagram was received.
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| 148 | *
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| 149 | */
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| 150 | void
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| 151 | udp_input(struct pbuf *p, struct netif *inp)
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| 152 | {
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| 153 | struct udp_hdr *udphdr;
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| 154 | struct udp_pcb *pcb, *prev;
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| 155 | struct udp_pcb *uncon_pcb;
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| 156 | struct ip_hdr *iphdr;
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| 157 | u16_t src, dest;
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| 158 | u8_t local_match;
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| 159 | u8_t broadcast;
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| 160 |
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| 161 | PERF_START;
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| 162 |
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| 163 | UDP_STATS_INC(udp.recv);
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| 164 |
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| 165 | iphdr = (struct ip_hdr *)p->payload;
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| 166 |
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| 167 | /* Check minimum length (IP header + UDP header)
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| 168 | * and move payload pointer to UDP header */
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| 169 | if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
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| 170 | /* drop short packets */
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| 171 | LWIP_DEBUGF(UDP_DEBUG,
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| 172 | ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
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| 173 | UDP_STATS_INC(udp.lenerr);
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| 174 | UDP_STATS_INC(udp.drop);
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| 175 | snmp_inc_udpinerrors();
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| 176 | pbuf_free(p);
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| 177 | goto end;
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| 178 | }
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| 179 |
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| 180 | udphdr = (struct udp_hdr *)p->payload;
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| 181 |
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| 182 | /* is broadcast packet ? */
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| 183 | broadcast = ip_addr_isbroadcast(¤t_iphdr_dest, inp);
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| 184 |
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| 185 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
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| 186 |
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| 187 | /* convert src and dest ports to host byte order */
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| 188 | src = ntohs(udphdr->src);
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| 189 | dest = ntohs(udphdr->dest);
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| 190 |
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| 191 | udp_debug_print(udphdr);
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| 192 |
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| 193 | /* print the UDP source and destination */
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| 194 | LWIP_DEBUGF(UDP_DEBUG,
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| 195 | ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
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| 196 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
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| 197 | ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
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| 198 | ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
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| 199 | ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
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| 200 | ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
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| 201 |
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| 202 | #if LWIP_DHCP
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| 203 | pcb = NULL;
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| 204 | /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
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| 205 | the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
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| 206 | if (dest == DHCP_CLIENT_PORT) {
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| 207 | /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
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| 208 | if (src == DHCP_SERVER_PORT) {
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| 209 | if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
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| 210 | /* accept the packe if
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| 211 | (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
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| 212 | - inp->dhcp->pcb->remote == ANY or iphdr->src */
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| 213 | if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
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| 214 | ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), ¤t_iphdr_src))) {
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| 215 | pcb = inp->dhcp->pcb;
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| 216 | }
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| 217 | }
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| 218 | }
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| 219 | } else
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| 220 | #endif /* LWIP_DHCP */
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| 221 | {
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| 222 | prev = NULL;
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| 223 | local_match = 0;
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| 224 | uncon_pcb = NULL;
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| 225 | /* Iterate through the UDP pcb list for a matching pcb.
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| 226 | * 'Perfect match' pcbs (connected to the remote port & ip address) are
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| 227 | * preferred. If no perfect match is found, the first unconnected pcb that
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| 228 | * matches the local port and ip address gets the datagram. */
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| 229 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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| 230 | local_match = 0;
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| 231 | /* print the PCB local and remote address */
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| 232 | LWIP_DEBUGF(UDP_DEBUG,
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| 233 | ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
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| 234 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
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| 235 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
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| 236 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
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| 237 | ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
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| 238 | ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
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| 239 |
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| 240 | /* compare PCB local addr+port to UDP destination addr+port */
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| 241 | if (pcb->local_port == dest) {
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| 242 | if (
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| 243 | (!broadcast && ip_addr_isany(&pcb->local_ip)) ||
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| 244 | ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest) ||
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| 245 | #if LWIP_IGMP
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| 246 | ip_addr_ismulticast(¤t_iphdr_dest) ||
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| 247 | #endif /* LWIP_IGMP */
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| 248 | #if IP_SOF_BROADCAST_RECV
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| 249 | (broadcast && ip_get_option(pcb, SOF_BROADCAST) &&
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| 250 | (ip_addr_isany(&pcb->local_ip) ||
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| 251 | ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
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| 252 | #else /* IP_SOF_BROADCAST_RECV */
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| 253 | (broadcast &&
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| 254 | (ip_addr_isany(&pcb->local_ip) ||
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| 255 | ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
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| 256 | #endif /* IP_SOF_BROADCAST_RECV */
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| 257 | local_match = 1;
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| 258 | if ((uncon_pcb == NULL) &&
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| 259 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
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| 260 | /* the first unconnected matching PCB */
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| 261 | uncon_pcb = pcb;
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| 262 | }
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| 263 | }
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| 264 | }
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| 265 | /* compare PCB remote addr+port to UDP source addr+port */
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| 266 | if ((local_match != 0) &&
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| 267 | (pcb->remote_port == src) &&
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| 268 | (ip_addr_isany(&pcb->remote_ip) ||
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| 269 | ip_addr_cmp(&(pcb->remote_ip), ¤t_iphdr_src))) {
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| 270 | /* the first fully matching PCB */
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| 271 | if (prev != NULL) {
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| 272 | /* move the pcb to the front of udp_pcbs so that is
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| 273 | found faster next time */
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| 274 | prev->next = pcb->next;
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| 275 | pcb->next = udp_pcbs;
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| 276 | udp_pcbs = pcb;
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| 277 | } else {
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| 278 | UDP_STATS_INC(udp.cachehit);
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| 279 | }
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| 280 | break;
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| 281 | }
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| 282 | prev = pcb;
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| 283 | }
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| 284 | /* no fully matching pcb found? then look for an unconnected pcb */
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| 285 | if (pcb == NULL) {
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| 286 | pcb = uncon_pcb;
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| 287 | }
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| 288 | }
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| 289 |
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| 290 | /* Check checksum if this is a match or if it was directed at us. */
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| 291 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, ¤t_iphdr_dest)) {
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| 292 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
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| 293 | #if LWIP_UDPLITE
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| 294 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
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| 295 | /* Do the UDP Lite checksum */
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| 296 | #if CHECKSUM_CHECK_UDP
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| 297 | u16_t chklen = ntohs(udphdr->len);
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| 298 | if (chklen < sizeof(struct udp_hdr)) {
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| 299 | if (chklen == 0) {
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| 300 | /* For UDP-Lite, checksum length of 0 means checksum
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| 301 | over the complete packet (See RFC 3828 chap. 3.1) */
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| 302 | chklen = p->tot_len;
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| 303 | } else {
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| 304 | /* At least the UDP-Lite header must be covered by the
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| 305 | checksum! (Again, see RFC 3828 chap. 3.1) */
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| 306 | UDP_STATS_INC(udp.chkerr);
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| 307 | UDP_STATS_INC(udp.drop);
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| 308 | snmp_inc_udpinerrors();
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| 309 | pbuf_free(p);
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| 310 | goto end;
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| 311 | }
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| 312 | }
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| 313 | if (inet_chksum_pseudo_partial(p, ¤t_iphdr_src, ¤t_iphdr_dest,
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| 314 | IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
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| 315 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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| 316 | ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
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| 317 | UDP_STATS_INC(udp.chkerr);
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| 318 | UDP_STATS_INC(udp.drop);
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| 319 | snmp_inc_udpinerrors();
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| 320 | pbuf_free(p);
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| 321 | goto end;
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| 322 | }
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| 323 | #endif /* CHECKSUM_CHECK_UDP */
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| 324 | } else
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| 325 | #endif /* LWIP_UDPLITE */
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| 326 | {
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| 327 | #if CHECKSUM_CHECK_UDP
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| 328 | if (udphdr->chksum != 0) {
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| 329 | if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
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| 330 | IP_PROTO_UDP, p->tot_len) != 0) {
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| 331 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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| 332 | ("udp_input: UDP datagram discarded due to failing checksum\n"));
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| 333 | UDP_STATS_INC(udp.chkerr);
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| 334 | UDP_STATS_INC(udp.drop);
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| 335 | snmp_inc_udpinerrors();
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| 336 | pbuf_free(p);
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| 337 | goto end;
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| 338 | }
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| 339 | }
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| 340 | #endif /* CHECKSUM_CHECK_UDP */
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| 341 | }
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| 342 | if(pbuf_header(p, -UDP_HLEN)) {
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| 343 | /* Can we cope with this failing? Just assert for now */
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| 344 | LWIP_ASSERT("pbuf_header failed\n", 0);
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| 345 | UDP_STATS_INC(udp.drop);
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| 346 | snmp_inc_udpinerrors();
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| 347 | pbuf_free(p);
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| 348 | goto end;
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| 349 | }
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| 350 | if (pcb != NULL) {
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| 351 | snmp_inc_udpindatagrams();
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| 352 | #if SO_REUSE && SO_REUSE_RXTOALL
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| 353 | if ((broadcast || ip_addr_ismulticast(¤t_iphdr_dest)) &&
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| 354 | ip_get_option(pcb, SOF_REUSEADDR)) {
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| 355 | /* pass broadcast- or multicast packets to all multicast pcbs
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| 356 | if SOF_REUSEADDR is set on the first match */
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| 357 | struct udp_pcb *mpcb;
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| 358 | u8_t p_header_changed = 0;
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| 359 | for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
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| 360 | if (mpcb != pcb) {
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| 361 | /* compare PCB local addr+port to UDP destination addr+port */
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| 362 | if ((mpcb->local_port == dest) &&
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| 363 | ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
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| 364 | ip_addr_cmp(&(mpcb->local_ip), ¤t_iphdr_dest) ||
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| 365 | #if LWIP_IGMP
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| 366 | ip_addr_ismulticast(¤t_iphdr_dest) ||
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| 367 | #endif /* LWIP_IGMP */
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| 368 | #if IP_SOF_BROADCAST_RECV
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| 369 | (broadcast && ip_get_option(mpcb, SOF_BROADCAST)))) {
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| 370 | #else /* IP_SOF_BROADCAST_RECV */
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| 371 | (broadcast))) {
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| 372 | #endif /* IP_SOF_BROADCAST_RECV */
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| 373 | /* pass a copy of the packet to all local matches */
|
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| 374 | if (mpcb->recv != NULL) {
|
---|
| 375 | struct pbuf *q;
|
---|
| 376 | /* for that, move payload to IP header again */
|
---|
| 377 | if (p_header_changed == 0) {
|
---|
| 378 | pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
|
---|
| 379 | p_header_changed = 1;
|
---|
| 380 | }
|
---|
| 381 | q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
|
---|
| 382 | if (q != NULL) {
|
---|
| 383 | err_t err = pbuf_copy(q, p);
|
---|
| 384 | if (err == ERR_OK) {
|
---|
| 385 | /* move payload to UDP data */
|
---|
| 386 | pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
|
---|
| 387 | mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
|
---|
| 388 | }
|
---|
| 389 | }
|
---|
| 390 | }
|
---|
| 391 | }
|
---|
| 392 | }
|
---|
| 393 | }
|
---|
| 394 | if (p_header_changed) {
|
---|
| 395 | /* and move payload to UDP data again */
|
---|
| 396 | pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
|
---|
| 397 | }
|
---|
| 398 | }
|
---|
| 399 | #endif /* SO_REUSE && SO_REUSE_RXTOALL */
|
---|
| 400 | /* callback */
|
---|
| 401 | if (pcb->recv != NULL) {
|
---|
| 402 | /* now the recv function is responsible for freeing p */
|
---|
| 403 | pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
|
---|
| 404 | } else {
|
---|
| 405 | /* no recv function registered? then we have to free the pbuf! */
|
---|
| 406 | pbuf_free(p);
|
---|
| 407 | goto end;
|
---|
| 408 | }
|
---|
| 409 | } else {
|
---|
| 410 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
|
---|
| 411 |
|
---|
| 412 | #if LWIP_ICMP
|
---|
| 413 | /* No match was found, send ICMP destination port unreachable unless
|
---|
| 414 | destination address was broadcast/multicast. */
|
---|
| 415 | if (!broadcast &&
|
---|
| 416 | !ip_addr_ismulticast(¤t_iphdr_dest)) {
|
---|
| 417 | /* move payload pointer back to ip header */
|
---|
| 418 | pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
|
---|
| 419 | LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
|
---|
| 420 | icmp_dest_unreach(p, ICMP_DUR_PORT);
|
---|
| 421 | }
|
---|
| 422 | #endif /* LWIP_ICMP */
|
---|
| 423 | UDP_STATS_INC(udp.proterr);
|
---|
| 424 | UDP_STATS_INC(udp.drop);
|
---|
| 425 | snmp_inc_udpnoports();
|
---|
| 426 | pbuf_free(p);
|
---|
| 427 | }
|
---|
| 428 | } else {
|
---|
| 429 | pbuf_free(p);
|
---|
| 430 | }
|
---|
| 431 | end:
|
---|
| 432 | PERF_STOP("udp_input");
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | /**
|
---|
| 436 | * Send data using UDP.
|
---|
| 437 | *
|
---|
| 438 | * @param pcb UDP PCB used to send the data.
|
---|
| 439 | * @param p chain of pbuf's to be sent.
|
---|
| 440 | *
|
---|
| 441 | * The datagram will be sent to the current remote_ip & remote_port
|
---|
| 442 | * stored in pcb. If the pcb is not bound to a port, it will
|
---|
| 443 | * automatically be bound to a random port.
|
---|
| 444 | *
|
---|
| 445 | * @return lwIP error code.
|
---|
| 446 | * - ERR_OK. Successful. No error occured.
|
---|
| 447 | * - ERR_MEM. Out of memory.
|
---|
| 448 | * - ERR_RTE. Could not find route to destination address.
|
---|
| 449 | * - More errors could be returned by lower protocol layers.
|
---|
| 450 | *
|
---|
| 451 | * @see udp_disconnect() udp_sendto()
|
---|
| 452 | */
|
---|
| 453 | err_t
|
---|
| 454 | udp_send(struct udp_pcb *pcb, struct pbuf *p)
|
---|
| 455 | {
|
---|
| 456 | /* send to the packet using remote ip and port stored in the pcb */
|
---|
| 457 | return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
|
---|
| 458 | }
|
---|
| 459 |
|
---|
| 460 | #if LWIP_CHECKSUM_ON_COPY
|
---|
| 461 | /** Same as udp_send() but with checksum
|
---|
| 462 | */
|
---|
| 463 | err_t
|
---|
| 464 | udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
|
---|
| 465 | u8_t have_chksum, u16_t chksum)
|
---|
| 466 | {
|
---|
| 467 | /* send to the packet using remote ip and port stored in the pcb */
|
---|
| 468 | return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
|
---|
| 469 | have_chksum, chksum);
|
---|
| 470 | }
|
---|
| 471 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 472 |
|
---|
| 473 | /**
|
---|
| 474 | * Send data to a specified address using UDP.
|
---|
| 475 | *
|
---|
| 476 | * @param pcb UDP PCB used to send the data.
|
---|
| 477 | * @param p chain of pbuf's to be sent.
|
---|
| 478 | * @param dst_ip Destination IP address.
|
---|
| 479 | * @param dst_port Destination UDP port.
|
---|
| 480 | *
|
---|
| 481 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
---|
| 482 | *
|
---|
| 483 | * If the PCB already has a remote address association, it will
|
---|
| 484 | * be restored after the data is sent.
|
---|
| 485 | *
|
---|
| 486 | * @return lwIP error code (@see udp_send for possible error codes)
|
---|
| 487 | *
|
---|
| 488 | * @see udp_disconnect() udp_send()
|
---|
| 489 | */
|
---|
| 490 | err_t
|
---|
| 491 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
|
---|
| 492 | ip_addr_t *dst_ip, u16_t dst_port)
|
---|
| 493 | {
|
---|
| 494 | #if LWIP_CHECKSUM_ON_COPY
|
---|
| 495 | return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
|
---|
| 496 | }
|
---|
| 497 |
|
---|
| 498 | /** Same as udp_sendto(), but with checksum */
|
---|
| 499 | err_t
|
---|
| 500 | udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
---|
| 501 | u16_t dst_port, u8_t have_chksum, u16_t chksum)
|
---|
| 502 | {
|
---|
| 503 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 504 | struct netif *netif;
|
---|
| 505 |
|
---|
| 506 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
|
---|
| 507 |
|
---|
| 508 | /* find the outgoing network interface for this packet */
|
---|
| 509 | #if LWIP_IGMP
|
---|
| 510 | netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
|
---|
| 511 | #else
|
---|
| 512 | netif = ip_route(dst_ip);
|
---|
| 513 | #endif /* LWIP_IGMP */
|
---|
| 514 |
|
---|
| 515 | /* no outgoing network interface could be found? */
|
---|
| 516 | if (netif == NULL) {
|
---|
| 517 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
| 518 | ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
|
---|
| 519 | UDP_STATS_INC(udp.rterr);
|
---|
| 520 | return ERR_RTE;
|
---|
| 521 | }
|
---|
| 522 | #if LWIP_CHECKSUM_ON_COPY
|
---|
| 523 | return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
|
---|
| 524 | #else /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 525 | return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
|
---|
| 526 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 527 | }
|
---|
| 528 |
|
---|
| 529 | /**
|
---|
| 530 | * Send data to a specified address using UDP.
|
---|
| 531 | * The netif used for sending can be specified.
|
---|
| 532 | *
|
---|
| 533 | * This function exists mainly for DHCP, to be able to send UDP packets
|
---|
| 534 | * on a netif that is still down.
|
---|
| 535 | *
|
---|
| 536 | * @param pcb UDP PCB used to send the data.
|
---|
| 537 | * @param p chain of pbuf's to be sent.
|
---|
| 538 | * @param dst_ip Destination IP address.
|
---|
| 539 | * @param dst_port Destination UDP port.
|
---|
| 540 | * @param netif the netif used for sending.
|
---|
| 541 | *
|
---|
| 542 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
---|
| 543 | *
|
---|
| 544 | * @return lwIP error code (@see udp_send for possible error codes)
|
---|
| 545 | *
|
---|
| 546 | * @see udp_disconnect() udp_send()
|
---|
| 547 | */
|
---|
| 548 | err_t
|
---|
| 549 | udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
|
---|
| 550 | ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
|
---|
| 551 | {
|
---|
| 552 | #if LWIP_CHECKSUM_ON_COPY
|
---|
| 553 | return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
|
---|
| 554 | }
|
---|
| 555 |
|
---|
| 556 | /** Same as udp_sendto_if(), but with checksum */
|
---|
| 557 | err_t
|
---|
| 558 | udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
---|
| 559 | u16_t dst_port, struct netif *netif, u8_t have_chksum,
|
---|
| 560 | u16_t chksum)
|
---|
| 561 | {
|
---|
| 562 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 563 | struct udp_hdr *udphdr;
|
---|
| 564 | ip_addr_t *src_ip;
|
---|
| 565 | err_t err;
|
---|
| 566 | struct pbuf *q; /* q will be sent down the stack */
|
---|
| 567 |
|
---|
| 568 | #if IP_SOF_BROADCAST
|
---|
| 569 | /* broadcast filter? */
|
---|
| 570 | if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
|
---|
| 571 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 572 | ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
|
---|
| 573 | return ERR_VAL;
|
---|
| 574 | }
|
---|
| 575 | #endif /* IP_SOF_BROADCAST */
|
---|
| 576 |
|
---|
| 577 | /* if the PCB is not yet bound to a port, bind it here */
|
---|
| 578 | if (pcb->local_port == 0) {
|
---|
| 579 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
|
---|
| 580 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
|
---|
| 581 | if (err != ERR_OK) {
|
---|
| 582 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
|
---|
| 583 | return err;
|
---|
| 584 | }
|
---|
| 585 | }
|
---|
| 586 |
|
---|
| 587 | /* not enough space to add an UDP header to first pbuf in given p chain? */
|
---|
| 588 | if (pbuf_header(p, UDP_HLEN)) {
|
---|
| 589 | /* allocate header in a separate new pbuf */
|
---|
| 590 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
|
---|
| 591 | /* new header pbuf could not be allocated? */
|
---|
| 592 | if (q == NULL) {
|
---|
| 593 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
|
---|
| 594 | return ERR_MEM;
|
---|
| 595 | }
|
---|
| 596 | if (p->tot_len != 0) {
|
---|
| 597 | /* chain header q in front of given pbuf p (only if p contains data) */
|
---|
| 598 | pbuf_chain(q, p);
|
---|
| 599 | }
|
---|
| 600 | /* first pbuf q points to header pbuf */
|
---|
| 601 | LWIP_DEBUGF(UDP_DEBUG,
|
---|
| 602 | ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
|
---|
| 603 | } else {
|
---|
| 604 | /* adding space for header within p succeeded */
|
---|
| 605 | /* first pbuf q equals given pbuf */
|
---|
| 606 | q = p;
|
---|
| 607 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
|
---|
| 608 | }
|
---|
| 609 | LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
|
---|
| 610 | (q->len >= sizeof(struct udp_hdr)));
|
---|
| 611 | /* q now represents the packet to be sent */
|
---|
| 612 | udphdr = (struct udp_hdr *)q->payload;
|
---|
| 613 | udphdr->src = htons(pcb->local_port);
|
---|
| 614 | udphdr->dest = htons(dst_port);
|
---|
| 615 | /* in UDP, 0 checksum means 'no checksum' */
|
---|
| 616 | udphdr->chksum = 0x0000;
|
---|
| 617 |
|
---|
| 618 | /* Multicast Loop? */
|
---|
| 619 | #if LWIP_IGMP
|
---|
| 620 | if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
|
---|
| 621 | q->flags |= PBUF_FLAG_MCASTLOOP;
|
---|
| 622 | }
|
---|
| 623 | #endif /* LWIP_IGMP */
|
---|
| 624 |
|
---|
| 625 |
|
---|
| 626 | /* PCB local address is IP_ANY_ADDR? */
|
---|
| 627 | if (ip_addr_isany(&pcb->local_ip)) {
|
---|
| 628 | /* use outgoing network interface IP address as source address */
|
---|
| 629 | src_ip = &(netif->ip_addr);
|
---|
| 630 | } else {
|
---|
| 631 | /* check if UDP PCB local IP address is correct
|
---|
| 632 | * this could be an old address if netif->ip_addr has changed */
|
---|
| 633 | if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
|
---|
| 634 | /* local_ip doesn't match, drop the packet */
|
---|
| 635 | if (q != p) {
|
---|
| 636 | /* free the header pbuf */
|
---|
| 637 | pbuf_free(q);
|
---|
| 638 | q = NULL;
|
---|
| 639 | /* p is still referenced by the caller, and will live on */
|
---|
| 640 | }
|
---|
| 641 | return ERR_VAL;
|
---|
| 642 | }
|
---|
| 643 | /* use UDP PCB local IP address as source address */
|
---|
| 644 | src_ip = &(pcb->local_ip);
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
|
---|
| 648 |
|
---|
| 649 | #if LWIP_UDPLITE
|
---|
| 650 | /* UDP Lite protocol? */
|
---|
| 651 | if (pcb->flags & UDP_FLAGS_UDPLITE) {
|
---|
| 652 | u16_t chklen, chklen_hdr;
|
---|
| 653 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
|
---|
| 654 | /* set UDP message length in UDP header */
|
---|
| 655 | chklen_hdr = chklen = pcb->chksum_len_tx;
|
---|
| 656 | if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
|
---|
| 657 | if (chklen != 0) {
|
---|
| 658 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
|
---|
| 659 | }
|
---|
| 660 | /* For UDP-Lite, checksum length of 0 means checksum
|
---|
| 661 | over the complete packet. (See RFC 3828 chap. 3.1)
|
---|
| 662 | At least the UDP-Lite header must be covered by the
|
---|
| 663 | checksum, therefore, if chksum_len has an illegal
|
---|
| 664 | value, we generate the checksum over the complete
|
---|
| 665 | packet to be safe. */
|
---|
| 666 | chklen_hdr = 0;
|
---|
| 667 | chklen = q->tot_len;
|
---|
| 668 | }
|
---|
| 669 | udphdr->len = htons(chklen_hdr);
|
---|
| 670 | /* calculate checksum */
|
---|
| 671 | #if CHECKSUM_GEN_UDP
|
---|
| 672 | udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
|
---|
| 673 | IP_PROTO_UDPLITE, q->tot_len,
|
---|
| 674 | #if !LWIP_CHECKSUM_ON_COPY
|
---|
| 675 | chklen);
|
---|
| 676 | #else /* !LWIP_CHECKSUM_ON_COPY */
|
---|
| 677 | (have_chksum ? UDP_HLEN : chklen));
|
---|
| 678 | if (have_chksum) {
|
---|
| 679 | u32_t acc;
|
---|
| 680 | acc = udphdr->chksum + (u16_t)~(chksum);
|
---|
| 681 | udphdr->chksum = FOLD_U32T(acc);
|
---|
| 682 | }
|
---|
| 683 | #endif /* !LWIP_CHECKSUM_ON_COPY */
|
---|
| 684 |
|
---|
| 685 | /* chksum zero must become 0xffff, as zero means 'no checksum' */
|
---|
| 686 | if (udphdr->chksum == 0x0000) {
|
---|
| 687 | udphdr->chksum = 0xffff;
|
---|
| 688 | }
|
---|
| 689 | #endif /* CHECKSUM_GEN_UDP */
|
---|
| 690 | /* output to IP */
|
---|
| 691 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
|
---|
| 692 | NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
|
---|
| 693 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
|
---|
| 694 | NETIF_SET_HWADDRHINT(netif, NULL);
|
---|
| 695 | } else
|
---|
| 696 | #endif /* LWIP_UDPLITE */
|
---|
| 697 | { /* UDP */
|
---|
| 698 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
|
---|
| 699 | udphdr->len = htons(q->tot_len);
|
---|
| 700 | /* calculate checksum */
|
---|
| 701 | #if CHECKSUM_GEN_UDP
|
---|
| 702 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
|
---|
| 703 | u16_t udpchksum;
|
---|
| 704 | #if LWIP_CHECKSUM_ON_COPY
|
---|
| 705 | if (have_chksum) {
|
---|
| 706 | u32_t acc;
|
---|
| 707 | udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
|
---|
| 708 | q->tot_len, UDP_HLEN);
|
---|
| 709 | acc = udpchksum + (u16_t)~(chksum);
|
---|
| 710 | udpchksum = FOLD_U32T(acc);
|
---|
| 711 | } else
|
---|
| 712 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
| 713 | {
|
---|
| 714 | udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
|
---|
| 715 | }
|
---|
| 716 |
|
---|
| 717 | /* chksum zero must become 0xffff, as zero means 'no checksum' */
|
---|
| 718 | if (udpchksum == 0x0000) {
|
---|
| 719 | udpchksum = 0xffff;
|
---|
| 720 | }
|
---|
| 721 | udphdr->chksum = udpchksum;
|
---|
| 722 | }
|
---|
| 723 | #endif /* CHECKSUM_GEN_UDP */
|
---|
| 724 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
|
---|
| 725 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
|
---|
| 726 | /* output to IP */
|
---|
| 727 | NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
|
---|
| 728 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
|
---|
| 729 | NETIF_SET_HWADDRHINT(netif, NULL);
|
---|
| 730 | }
|
---|
| 731 | /* TODO: must this be increased even if error occured? */
|
---|
| 732 | snmp_inc_udpoutdatagrams();
|
---|
| 733 |
|
---|
| 734 | /* did we chain a separate header pbuf earlier? */
|
---|
| 735 | if (q != p) {
|
---|
| 736 | /* free the header pbuf */
|
---|
| 737 | pbuf_free(q);
|
---|
| 738 | q = NULL;
|
---|
| 739 | /* p is still referenced by the caller, and will live on */
|
---|
| 740 | }
|
---|
| 741 |
|
---|
| 742 | UDP_STATS_INC(udp.xmit);
|
---|
| 743 | return err;
|
---|
| 744 | }
|
---|
| 745 |
|
---|
| 746 | /**
|
---|
| 747 | * Bind an UDP PCB.
|
---|
| 748 | *
|
---|
| 749 | * @param pcb UDP PCB to be bound with a local address ipaddr and port.
|
---|
| 750 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
|
---|
| 751 | * bind to all local interfaces.
|
---|
| 752 | * @param port local UDP port to bind with. Use 0 to automatically bind
|
---|
| 753 | * to a random port between UDP_LOCAL_PORT_RANGE_START and
|
---|
| 754 | * UDP_LOCAL_PORT_RANGE_END.
|
---|
| 755 | *
|
---|
| 756 | * ipaddr & port are expected to be in the same byte order as in the pcb.
|
---|
| 757 | *
|
---|
| 758 | * @return lwIP error code.
|
---|
| 759 | * - ERR_OK. Successful. No error occured.
|
---|
| 760 | * - ERR_USE. The specified ipaddr and port are already bound to by
|
---|
| 761 | * another UDP PCB.
|
---|
| 762 | *
|
---|
| 763 | * @see udp_disconnect()
|
---|
| 764 | */
|
---|
| 765 | err_t
|
---|
| 766 | udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
| 767 | {
|
---|
| 768 | struct udp_pcb *ipcb;
|
---|
| 769 | u8_t rebind;
|
---|
| 770 |
|
---|
| 771 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
|
---|
| 772 | ip_addr_debug_print(UDP_DEBUG, ipaddr);
|
---|
| 773 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
|
---|
| 774 |
|
---|
| 775 | rebind = 0;
|
---|
| 776 | /* Check for double bind and rebind of the same pcb */
|
---|
| 777 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
|
---|
| 778 | /* is this UDP PCB already on active list? */
|
---|
| 779 | if (pcb == ipcb) {
|
---|
| 780 | /* pcb may occur at most once in active list */
|
---|
| 781 | LWIP_ASSERT("rebind == 0", rebind == 0);
|
---|
| 782 | /* pcb already in list, just rebind */
|
---|
| 783 | rebind = 1;
|
---|
| 784 | }
|
---|
| 785 |
|
---|
| 786 | /* By default, we don't allow to bind to a port that any other udp
|
---|
| 787 | PCB is alread bound to, unless *all* PCBs with that port have tha
|
---|
| 788 | REUSEADDR flag set. */
|
---|
| 789 | #if SO_REUSE
|
---|
| 790 | else if (!ip_get_option(pcb, SOF_REUSEADDR) &&
|
---|
| 791 | !ip_get_option(ipcb, SOF_REUSEADDR)) {
|
---|
| 792 | #else /* SO_REUSE */
|
---|
| 793 | /* port matches that of PCB in list and REUSEADDR not set -> reject */
|
---|
| 794 | else {
|
---|
| 795 | #endif /* SO_REUSE */
|
---|
| 796 | if ((ipcb->local_port == port) &&
|
---|
| 797 | /* IP address matches, or one is IP_ADDR_ANY? */
|
---|
| 798 | (ip_addr_isany(&(ipcb->local_ip)) ||
|
---|
| 799 | ip_addr_isany(ipaddr) ||
|
---|
| 800 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
|
---|
| 801 | /* other PCB already binds to this local IP and port */
|
---|
| 802 | LWIP_DEBUGF(UDP_DEBUG,
|
---|
| 803 | ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
|
---|
| 804 | return ERR_USE;
|
---|
| 805 | }
|
---|
| 806 | }
|
---|
| 807 | }
|
---|
| 808 |
|
---|
| 809 | ip_addr_set(&pcb->local_ip, ipaddr);
|
---|
| 810 |
|
---|
| 811 | /* no port specified? */
|
---|
| 812 | if (port == 0) {
|
---|
| 813 | port = udp_new_port();
|
---|
| 814 | if (port == 0) {
|
---|
| 815 | /* no more ports available in local range */
|
---|
| 816 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
|
---|
| 817 | return ERR_USE;
|
---|
| 818 | }
|
---|
| 819 | }
|
---|
| 820 | pcb->local_port = port;
|
---|
| 821 | snmp_insert_udpidx_tree(pcb);
|
---|
| 822 | /* pcb not active yet? */
|
---|
| 823 | if (rebind == 0) {
|
---|
| 824 | /* place the PCB on the active list if not already there */
|
---|
| 825 | pcb->next = udp_pcbs;
|
---|
| 826 | udp_pcbs = pcb;
|
---|
| 827 | }
|
---|
| 828 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 829 | ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
|
---|
| 830 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
|
---|
| 831 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
|
---|
| 832 | pcb->local_port));
|
---|
| 833 | return ERR_OK;
|
---|
| 834 | }
|
---|
| 835 | /**
|
---|
| 836 | * Connect an UDP PCB.
|
---|
| 837 | *
|
---|
| 838 | * This will associate the UDP PCB with the remote address.
|
---|
| 839 | *
|
---|
| 840 | * @param pcb UDP PCB to be connected with remote address ipaddr and port.
|
---|
| 841 | * @param ipaddr remote IP address to connect with.
|
---|
| 842 | * @param port remote UDP port to connect with.
|
---|
| 843 | *
|
---|
| 844 | * @return lwIP error code
|
---|
| 845 | *
|
---|
| 846 | * ipaddr & port are expected to be in the same byte order as in the pcb.
|
---|
| 847 | *
|
---|
| 848 | * The udp pcb is bound to a random local port if not already bound.
|
---|
| 849 | *
|
---|
| 850 | * @see udp_disconnect()
|
---|
| 851 | */
|
---|
| 852 | err_t
|
---|
| 853 | udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
| 854 | {
|
---|
| 855 | struct udp_pcb *ipcb;
|
---|
| 856 |
|
---|
| 857 | if (pcb->local_port == 0) {
|
---|
| 858 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
|
---|
| 859 | if (err != ERR_OK) {
|
---|
| 860 | return err;
|
---|
| 861 | }
|
---|
| 862 | }
|
---|
| 863 |
|
---|
| 864 | ip_addr_set(&pcb->remote_ip, ipaddr);
|
---|
| 865 | pcb->remote_port = port;
|
---|
| 866 | pcb->flags |= UDP_FLAGS_CONNECTED;
|
---|
| 867 | /** TODO: this functionality belongs in upper layers */
|
---|
| 868 | #ifdef LWIP_UDP_TODO
|
---|
| 869 | /* Nail down local IP for netconn_addr()/getsockname() */
|
---|
| 870 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
|
---|
| 871 | struct netif *netif;
|
---|
| 872 |
|
---|
| 873 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
|
---|
| 874 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
|
---|
| 875 | UDP_STATS_INC(udp.rterr);
|
---|
| 876 | return ERR_RTE;
|
---|
| 877 | }
|
---|
| 878 | /** TODO: this will bind the udp pcb locally, to the interface which
|
---|
| 879 | is used to route output packets to the remote address. However, we
|
---|
| 880 | might want to accept incoming packets on any interface! */
|
---|
| 881 | pcb->local_ip = netif->ip_addr;
|
---|
| 882 | } else if (ip_addr_isany(&pcb->remote_ip)) {
|
---|
| 883 | pcb->local_ip.addr = 0;
|
---|
| 884 | }
|
---|
| 885 | #endif
|
---|
| 886 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 887 | ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
|
---|
| 888 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
|
---|
| 889 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
|
---|
| 890 | pcb->local_port));
|
---|
| 891 |
|
---|
| 892 | /* Insert UDP PCB into the list of active UDP PCBs. */
|
---|
| 893 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
|
---|
| 894 | if (pcb == ipcb) {
|
---|
| 895 | /* already on the list, just return */
|
---|
| 896 | return ERR_OK;
|
---|
| 897 | }
|
---|
| 898 | }
|
---|
| 899 | /* PCB not yet on the list, add PCB now */
|
---|
| 900 | pcb->next = udp_pcbs;
|
---|
| 901 | udp_pcbs = pcb;
|
---|
| 902 | return ERR_OK;
|
---|
| 903 | }
|
---|
| 904 |
|
---|
| 905 | /**
|
---|
| 906 | * Disconnect a UDP PCB
|
---|
| 907 | *
|
---|
| 908 | * @param pcb the udp pcb to disconnect.
|
---|
| 909 | */
|
---|
| 910 | void
|
---|
| 911 | udp_disconnect(struct udp_pcb *pcb)
|
---|
| 912 | {
|
---|
| 913 | /* reset remote address association */
|
---|
| 914 | ip_addr_set_any(&pcb->remote_ip);
|
---|
| 915 | pcb->remote_port = 0;
|
---|
| 916 | /* mark PCB as unconnected */
|
---|
| 917 | pcb->flags &= ~UDP_FLAGS_CONNECTED;
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 | /**
|
---|
| 921 | * Set a receive callback for a UDP PCB
|
---|
| 922 | *
|
---|
| 923 | * This callback will be called when receiving a datagram for the pcb.
|
---|
| 924 | *
|
---|
| 925 | * @param pcb the pcb for wich to set the recv callback
|
---|
| 926 | * @param recv function pointer of the callback function
|
---|
| 927 | * @param recv_arg additional argument to pass to the callback function
|
---|
| 928 | */
|
---|
| 929 | void
|
---|
| 930 | udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
|
---|
| 931 | {
|
---|
| 932 | /* remember recv() callback and user data */
|
---|
| 933 | pcb->recv = recv;
|
---|
| 934 | pcb->recv_arg = recv_arg;
|
---|
| 935 | }
|
---|
| 936 |
|
---|
| 937 | /**
|
---|
| 938 | * Remove an UDP PCB.
|
---|
| 939 | *
|
---|
| 940 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of
|
---|
| 941 | * UDP PCB's and the data structure is freed from memory.
|
---|
| 942 | *
|
---|
| 943 | * @see udp_new()
|
---|
| 944 | */
|
---|
| 945 | void
|
---|
| 946 | udp_remove(struct udp_pcb *pcb)
|
---|
| 947 | {
|
---|
| 948 | struct udp_pcb *pcb2;
|
---|
| 949 |
|
---|
| 950 | snmp_delete_udpidx_tree(pcb);
|
---|
| 951 | /* pcb to be removed is first in list? */
|
---|
| 952 | if (udp_pcbs == pcb) {
|
---|
| 953 | /* make list start at 2nd pcb */
|
---|
| 954 | udp_pcbs = udp_pcbs->next;
|
---|
| 955 | /* pcb not 1st in list */
|
---|
| 956 | } else {
|
---|
| 957 | for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
|
---|
| 958 | /* find pcb in udp_pcbs list */
|
---|
| 959 | if (pcb2->next != NULL && pcb2->next == pcb) {
|
---|
| 960 | /* remove pcb from list */
|
---|
| 961 | pcb2->next = pcb->next;
|
---|
| 962 | }
|
---|
| 963 | }
|
---|
| 964 | }
|
---|
| 965 | memp_free(MEMP_UDP_PCB, pcb);
|
---|
| 966 | }
|
---|
| 967 |
|
---|
| 968 | /**
|
---|
| 969 | * Create a UDP PCB.
|
---|
| 970 | *
|
---|
| 971 | * @return The UDP PCB which was created. NULL if the PCB data structure
|
---|
| 972 | * could not be allocated.
|
---|
| 973 | *
|
---|
| 974 | * @see udp_remove()
|
---|
| 975 | */
|
---|
| 976 | struct udp_pcb *
|
---|
| 977 | udp_new(void)
|
---|
| 978 | {
|
---|
| 979 | struct udp_pcb *pcb;
|
---|
| 980 | pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
|
---|
| 981 | /* could allocate UDP PCB? */
|
---|
| 982 | if (pcb != NULL) {
|
---|
| 983 | /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
|
---|
| 984 | * which means checksum is generated over the whole datagram per default
|
---|
| 985 | * (recommended as default by RFC 3828). */
|
---|
| 986 | /* initialize PCB to all zeroes */
|
---|
| 987 | memset(pcb, 0, sizeof(struct udp_pcb));
|
---|
| 988 | pcb->ttl = UDP_TTL;
|
---|
| 989 | }
|
---|
| 990 | return pcb;
|
---|
| 991 | }
|
---|
| 992 |
|
---|
| 993 | #if UDP_DEBUG
|
---|
| 994 | /**
|
---|
| 995 | * Print UDP header information for debug purposes.
|
---|
| 996 | *
|
---|
| 997 | * @param udphdr pointer to the udp header in memory.
|
---|
| 998 | */
|
---|
| 999 | void
|
---|
| 1000 | udp_debug_print(struct udp_hdr *udphdr)
|
---|
| 1001 | {
|
---|
| 1002 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
|
---|
| 1003 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1004 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
---|
| 1005 | ntohs(udphdr->src), ntohs(udphdr->dest)));
|
---|
| 1006 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1007 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
|
---|
| 1008 | ntohs(udphdr->len), ntohs(udphdr->chksum)));
|
---|
| 1009 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1010 | }
|
---|
| 1011 | #endif /* UDP_DEBUG */
|
---|
| 1012 |
|
---|
| 1013 | #endif /* LWIP_UDP */
|
---|