CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/udp.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * User Datagram Protocol module
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 */
GordonSin 0:0ed2a7c7190c 6
GordonSin 0:0ed2a7c7190c 7 /*
GordonSin 0:0ed2a7c7190c 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
GordonSin 0:0ed2a7c7190c 9 * All rights reserved.
GordonSin 0:0ed2a7c7190c 10 *
GordonSin 0:0ed2a7c7190c 11 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 12 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 13 *
GordonSin 0:0ed2a7c7190c 14 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 15 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 17 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 18 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 19 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 20 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 21 *
GordonSin 0:0ed2a7c7190c 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 31 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 32 *
GordonSin 0:0ed2a7c7190c 33 * This file is part of the lwIP TCP/IP stack.
GordonSin 0:0ed2a7c7190c 34 *
GordonSin 0:0ed2a7c7190c 35 * Author: Adam Dunkels <adam@sics.se>
GordonSin 0:0ed2a7c7190c 36 *
GordonSin 0:0ed2a7c7190c 37 */
GordonSin 0:0ed2a7c7190c 38
GordonSin 0:0ed2a7c7190c 39
GordonSin 0:0ed2a7c7190c 40 /* udp.c
GordonSin 0:0ed2a7c7190c 41 *
GordonSin 0:0ed2a7c7190c 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
GordonSin 0:0ed2a7c7190c 43 *
GordonSin 0:0ed2a7c7190c 44 */
GordonSin 0:0ed2a7c7190c 45
GordonSin 0:0ed2a7c7190c 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
GordonSin 0:0ed2a7c7190c 47 */
GordonSin 0:0ed2a7c7190c 48
GordonSin 0:0ed2a7c7190c 49 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 50
GordonSin 0:0ed2a7c7190c 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
GordonSin 0:0ed2a7c7190c 52
GordonSin 0:0ed2a7c7190c 53 #include "lwip/udp.h"
GordonSin 0:0ed2a7c7190c 54 #include "lwip/def.h"
GordonSin 0:0ed2a7c7190c 55 #include "lwip/memp.h"
GordonSin 0:0ed2a7c7190c 56 #include "lwip/inet_chksum.h"
GordonSin 0:0ed2a7c7190c 57 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 58 #include "lwip/netif.h"
GordonSin 0:0ed2a7c7190c 59 #include "lwip/icmp.h"
GordonSin 0:0ed2a7c7190c 60 #include "lwip/stats.h"
GordonSin 0:0ed2a7c7190c 61 #include "lwip/snmp.h"
GordonSin 0:0ed2a7c7190c 62 #include "arch/perf.h"
GordonSin 0:0ed2a7c7190c 63 #include "lwip/dhcp.h"
GordonSin 0:0ed2a7c7190c 64
GordonSin 0:0ed2a7c7190c 65 #include <string.h>
GordonSin 0:0ed2a7c7190c 66
GordonSin 0:0ed2a7c7190c 67 /* The list of UDP PCBs */
GordonSin 0:0ed2a7c7190c 68 /* exported in udp.h (was static) */
GordonSin 0:0ed2a7c7190c 69 struct udp_pcb *udp_pcbs;
GordonSin 0:0ed2a7c7190c 70
GordonSin 0:0ed2a7c7190c 71 /**
GordonSin 0:0ed2a7c7190c 72 * Process an incoming UDP datagram.
GordonSin 0:0ed2a7c7190c 73 *
GordonSin 0:0ed2a7c7190c 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
GordonSin 0:0ed2a7c7190c 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
GordonSin 0:0ed2a7c7190c 76 * recv function. If no pcb is found or the datagram is incorrect, the
GordonSin 0:0ed2a7c7190c 77 * pbuf is freed.
GordonSin 0:0ed2a7c7190c 78 *
GordonSin 0:0ed2a7c7190c 79 * @param p pbuf to be demultiplexed to a UDP PCB.
GordonSin 0:0ed2a7c7190c 80 * @param inp network interface on which the datagram was received.
GordonSin 0:0ed2a7c7190c 81 *
GordonSin 0:0ed2a7c7190c 82 */
GordonSin 0:0ed2a7c7190c 83 void
GordonSin 0:0ed2a7c7190c 84 udp_input(struct pbuf *p, struct netif *inp)
GordonSin 0:0ed2a7c7190c 85 {
GordonSin 0:0ed2a7c7190c 86 struct udp_hdr *udphdr;
GordonSin 0:0ed2a7c7190c 87 struct udp_pcb *pcb, *prev;
GordonSin 0:0ed2a7c7190c 88 struct udp_pcb *uncon_pcb;
GordonSin 0:0ed2a7c7190c 89 struct ip_hdr *iphdr;
GordonSin 0:0ed2a7c7190c 90 u16_t src, dest;
GordonSin 0:0ed2a7c7190c 91 u8_t local_match;
GordonSin 0:0ed2a7c7190c 92 u8_t broadcast;
GordonSin 0:0ed2a7c7190c 93
GordonSin 0:0ed2a7c7190c 94 PERF_START;
GordonSin 0:0ed2a7c7190c 95
GordonSin 0:0ed2a7c7190c 96 UDP_STATS_INC(udp.recv);
GordonSin 0:0ed2a7c7190c 97
GordonSin 0:0ed2a7c7190c 98 iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 99
GordonSin 0:0ed2a7c7190c 100 /* Check minimum length (IP header + UDP header)
GordonSin 0:0ed2a7c7190c 101 * and move payload pointer to UDP header */
GordonSin 0:0ed2a7c7190c 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
GordonSin 0:0ed2a7c7190c 103 /* drop short packets */
GordonSin 0:0ed2a7c7190c 104 LWIP_DEBUGF(UDP_DEBUG,
GordonSin 0:0ed2a7c7190c 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
GordonSin 0:0ed2a7c7190c 106 UDP_STATS_INC(udp.lenerr);
GordonSin 0:0ed2a7c7190c 107 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 108 snmp_inc_udpinerrors();
GordonSin 0:0ed2a7c7190c 109 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 110 goto end;
GordonSin 0:0ed2a7c7190c 111 }
GordonSin 0:0ed2a7c7190c 112
GordonSin 0:0ed2a7c7190c 113 udphdr = (struct udp_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 114
GordonSin 0:0ed2a7c7190c 115 /* is broadcast packet ? */
GordonSin 0:0ed2a7c7190c 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
GordonSin 0:0ed2a7c7190c 117
GordonSin 0:0ed2a7c7190c 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
GordonSin 0:0ed2a7c7190c 119
GordonSin 0:0ed2a7c7190c 120 /* convert src and dest ports to host byte order */
GordonSin 0:0ed2a7c7190c 121 src = ntohs(udphdr->src);
GordonSin 0:0ed2a7c7190c 122 dest = ntohs(udphdr->dest);
GordonSin 0:0ed2a7c7190c 123
GordonSin 0:0ed2a7c7190c 124 udp_debug_print(udphdr);
GordonSin 0:0ed2a7c7190c 125
GordonSin 0:0ed2a7c7190c 126 /* print the UDP source and destination */
GordonSin 0:0ed2a7c7190c 127 LWIP_DEBUGF(UDP_DEBUG,
GordonSin 0:0ed2a7c7190c 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
GordonSin 0:0ed2a7c7190c 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
GordonSin 0:0ed2a7c7190c 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
GordonSin 0:0ed2a7c7190c 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
GordonSin 0:0ed2a7c7190c 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
GordonSin 0:0ed2a7c7190c 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
GordonSin 0:0ed2a7c7190c 134
GordonSin 0:0ed2a7c7190c 135 #if LWIP_DHCP
GordonSin 0:0ed2a7c7190c 136 pcb = NULL;
GordonSin 0:0ed2a7c7190c 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
GordonSin 0:0ed2a7c7190c 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
GordonSin 0:0ed2a7c7190c 139 if (dest == DHCP_CLIENT_PORT) {
GordonSin 0:0ed2a7c7190c 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
GordonSin 0:0ed2a7c7190c 141 if (src == DHCP_SERVER_PORT) {
GordonSin 0:0ed2a7c7190c 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
GordonSin 0:0ed2a7c7190c 143 /* accept the packe if
GordonSin 0:0ed2a7c7190c 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
GordonSin 0:0ed2a7c7190c 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
GordonSin 0:0ed2a7c7190c 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
GordonSin 0:0ed2a7c7190c 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
GordonSin 0:0ed2a7c7190c 148 pcb = inp->dhcp->pcb;
GordonSin 0:0ed2a7c7190c 149 }
GordonSin 0:0ed2a7c7190c 150 }
GordonSin 0:0ed2a7c7190c 151 }
GordonSin 0:0ed2a7c7190c 152 } else
GordonSin 0:0ed2a7c7190c 153 #endif /* LWIP_DHCP */
GordonSin 0:0ed2a7c7190c 154 {
GordonSin 0:0ed2a7c7190c 155 prev = NULL;
GordonSin 0:0ed2a7c7190c 156 local_match = 0;
GordonSin 0:0ed2a7c7190c 157 uncon_pcb = NULL;
GordonSin 0:0ed2a7c7190c 158 /* Iterate through the UDP pcb list for a matching pcb.
GordonSin 0:0ed2a7c7190c 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
GordonSin 0:0ed2a7c7190c 160 * preferred. If no perfect match is found, the first unconnected pcb that
GordonSin 0:0ed2a7c7190c 161 * matches the local port and ip address gets the datagram. */
GordonSin 0:0ed2a7c7190c 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
GordonSin 0:0ed2a7c7190c 163 local_match = 0;
GordonSin 0:0ed2a7c7190c 164 /* print the PCB local and remote address */
GordonSin 0:0ed2a7c7190c 165 LWIP_DEBUGF(UDP_DEBUG,
GordonSin 0:0ed2a7c7190c 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
GordonSin 0:0ed2a7c7190c 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
GordonSin 0:0ed2a7c7190c 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
GordonSin 0:0ed2a7c7190c 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
GordonSin 0:0ed2a7c7190c 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
GordonSin 0:0ed2a7c7190c 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
GordonSin 0:0ed2a7c7190c 172
GordonSin 0:0ed2a7c7190c 173 /* compare PCB local addr+port to UDP destination addr+port */
GordonSin 0:0ed2a7c7190c 174 if ((pcb->local_port == dest) &&
GordonSin 0:0ed2a7c7190c 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
GordonSin 0:0ed2a7c7190c 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
GordonSin 0:0ed2a7c7190c 177 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 178 ip_addr_ismulticast(&current_iphdr_dest) ||
GordonSin 0:0ed2a7c7190c 179 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 180 #if IP_SOF_BROADCAST_RECV
GordonSin 0:0ed2a7c7190c 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
GordonSin 0:0ed2a7c7190c 182 #else /* IP_SOF_BROADCAST_RECV */
GordonSin 0:0ed2a7c7190c 183 (broadcast))) {
GordonSin 0:0ed2a7c7190c 184 #endif /* IP_SOF_BROADCAST_RECV */
GordonSin 0:0ed2a7c7190c 185 local_match = 1;
GordonSin 0:0ed2a7c7190c 186 if ((uncon_pcb == NULL) &&
GordonSin 0:0ed2a7c7190c 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
GordonSin 0:0ed2a7c7190c 188 /* the first unconnected matching PCB */
GordonSin 0:0ed2a7c7190c 189 uncon_pcb = pcb;
GordonSin 0:0ed2a7c7190c 190 }
GordonSin 0:0ed2a7c7190c 191 }
GordonSin 0:0ed2a7c7190c 192 /* compare PCB remote addr+port to UDP source addr+port */
GordonSin 0:0ed2a7c7190c 193 if ((local_match != 0) &&
GordonSin 0:0ed2a7c7190c 194 (pcb->remote_port == src) &&
GordonSin 0:0ed2a7c7190c 195 (ip_addr_isany(&pcb->remote_ip) ||
GordonSin 0:0ed2a7c7190c 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
GordonSin 0:0ed2a7c7190c 197 /* the first fully matching PCB */
GordonSin 0:0ed2a7c7190c 198 if (prev != NULL) {
GordonSin 0:0ed2a7c7190c 199 /* move the pcb to the front of udp_pcbs so that is
GordonSin 0:0ed2a7c7190c 200 found faster next time */
GordonSin 0:0ed2a7c7190c 201 prev->next = pcb->next;
GordonSin 0:0ed2a7c7190c 202 pcb->next = udp_pcbs;
GordonSin 0:0ed2a7c7190c 203 udp_pcbs = pcb;
GordonSin 0:0ed2a7c7190c 204 } else {
GordonSin 0:0ed2a7c7190c 205 UDP_STATS_INC(udp.cachehit);
GordonSin 0:0ed2a7c7190c 206 }
GordonSin 0:0ed2a7c7190c 207 break;
GordonSin 0:0ed2a7c7190c 208 }
GordonSin 0:0ed2a7c7190c 209 prev = pcb;
GordonSin 0:0ed2a7c7190c 210 }
GordonSin 0:0ed2a7c7190c 211 /* no fully matching pcb found? then look for an unconnected pcb */
GordonSin 0:0ed2a7c7190c 212 if (pcb == NULL) {
GordonSin 0:0ed2a7c7190c 213 pcb = uncon_pcb;
GordonSin 0:0ed2a7c7190c 214 }
GordonSin 0:0ed2a7c7190c 215 }
GordonSin 0:0ed2a7c7190c 216
GordonSin 0:0ed2a7c7190c 217 /* Check checksum if this is a match or if it was directed at us. */
GordonSin 0:0ed2a7c7190c 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
GordonSin 0:0ed2a7c7190c 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
GordonSin 0:0ed2a7c7190c 220 #if LWIP_UDPLITE
GordonSin 0:0ed2a7c7190c 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
GordonSin 0:0ed2a7c7190c 222 /* Do the UDP Lite checksum */
GordonSin 0:0ed2a7c7190c 223 #if CHECKSUM_CHECK_UDP
GordonSin 0:0ed2a7c7190c 224 u16_t chklen = ntohs(udphdr->len);
GordonSin 0:0ed2a7c7190c 225 if (chklen < sizeof(struct udp_hdr)) {
GordonSin 0:0ed2a7c7190c 226 if (chklen == 0) {
GordonSin 0:0ed2a7c7190c 227 /* For UDP-Lite, checksum length of 0 means checksum
GordonSin 0:0ed2a7c7190c 228 over the complete packet (See RFC 3828 chap. 3.1) */
GordonSin 0:0ed2a7c7190c 229 chklen = p->tot_len;
GordonSin 0:0ed2a7c7190c 230 } else {
GordonSin 0:0ed2a7c7190c 231 /* At least the UDP-Lite header must be covered by the
GordonSin 0:0ed2a7c7190c 232 checksum! (Again, see RFC 3828 chap. 3.1) */
GordonSin 0:0ed2a7c7190c 233 UDP_STATS_INC(udp.chkerr);
GordonSin 0:0ed2a7c7190c 234 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 235 snmp_inc_udpinerrors();
GordonSin 0:0ed2a7c7190c 236 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 237 goto end;
GordonSin 0:0ed2a7c7190c 238 }
GordonSin 0:0ed2a7c7190c 239 }
GordonSin 0:0ed2a7c7190c 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
GordonSin 0:0ed2a7c7190c 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
GordonSin 0:0ed2a7c7190c 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
GordonSin 0:0ed2a7c7190c 244 UDP_STATS_INC(udp.chkerr);
GordonSin 0:0ed2a7c7190c 245 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 246 snmp_inc_udpinerrors();
GordonSin 0:0ed2a7c7190c 247 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 248 goto end;
GordonSin 0:0ed2a7c7190c 249 }
GordonSin 0:0ed2a7c7190c 250 #endif /* CHECKSUM_CHECK_UDP */
GordonSin 0:0ed2a7c7190c 251 } else
GordonSin 0:0ed2a7c7190c 252 #endif /* LWIP_UDPLITE */
GordonSin 0:0ed2a7c7190c 253 {
GordonSin 0:0ed2a7c7190c 254 #if CHECKSUM_CHECK_UDP
GordonSin 0:0ed2a7c7190c 255 if (udphdr->chksum != 0) {
GordonSin 0:0ed2a7c7190c 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
GordonSin 0:0ed2a7c7190c 257 IP_PROTO_UDP, p->tot_len) != 0) {
GordonSin 0:0ed2a7c7190c 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
GordonSin 0:0ed2a7c7190c 260 UDP_STATS_INC(udp.chkerr);
GordonSin 0:0ed2a7c7190c 261 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 262 snmp_inc_udpinerrors();
GordonSin 0:0ed2a7c7190c 263 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 264 goto end;
GordonSin 0:0ed2a7c7190c 265 }
GordonSin 0:0ed2a7c7190c 266 }
GordonSin 0:0ed2a7c7190c 267 #endif /* CHECKSUM_CHECK_UDP */
GordonSin 0:0ed2a7c7190c 268 }
GordonSin 0:0ed2a7c7190c 269 if(pbuf_header(p, -UDP_HLEN)) {
GordonSin 0:0ed2a7c7190c 270 /* Can we cope with this failing? Just assert for now */
GordonSin 0:0ed2a7c7190c 271 LWIP_ASSERT("pbuf_header failed\n", 0);
GordonSin 0:0ed2a7c7190c 272 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 273 snmp_inc_udpinerrors();
GordonSin 0:0ed2a7c7190c 274 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 275 goto end;
GordonSin 0:0ed2a7c7190c 276 }
GordonSin 0:0ed2a7c7190c 277 if (pcb != NULL) {
GordonSin 0:0ed2a7c7190c 278 snmp_inc_udpindatagrams();
GordonSin 0:0ed2a7c7190c 279 #if SO_REUSE && SO_REUSE_RXTOALL
GordonSin 0:0ed2a7c7190c 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
GordonSin 0:0ed2a7c7190c 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
GordonSin 0:0ed2a7c7190c 282 /* pass broadcast- or multicast packets to all multicast pcbs
GordonSin 0:0ed2a7c7190c 283 if SOF_REUSEADDR is set on the first match */
GordonSin 0:0ed2a7c7190c 284 struct udp_pcb *mpcb;
GordonSin 0:0ed2a7c7190c 285 u8_t p_header_changed = 0;
GordonSin 0:0ed2a7c7190c 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
GordonSin 0:0ed2a7c7190c 287 if (mpcb != pcb) {
GordonSin 0:0ed2a7c7190c 288 /* compare PCB local addr+port to UDP destination addr+port */
GordonSin 0:0ed2a7c7190c 289 if ((mpcb->local_port == dest) &&
GordonSin 0:0ed2a7c7190c 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
GordonSin 0:0ed2a7c7190c 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
GordonSin 0:0ed2a7c7190c 292 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 293 ip_addr_ismulticast(&current_iphdr_dest) ||
GordonSin 0:0ed2a7c7190c 294 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 295 #if IP_SOF_BROADCAST_RECV
GordonSin 0:0ed2a7c7190c 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
GordonSin 0:0ed2a7c7190c 297 #else /* IP_SOF_BROADCAST_RECV */
GordonSin 0:0ed2a7c7190c 298 (broadcast))) {
GordonSin 0:0ed2a7c7190c 299 #endif /* IP_SOF_BROADCAST_RECV */
GordonSin 0:0ed2a7c7190c 300 /* pass a copy of the packet to all local matches */
GordonSin 0:0ed2a7c7190c 301 if (mpcb->recv != NULL) {
GordonSin 0:0ed2a7c7190c 302 struct pbuf *q;
GordonSin 0:0ed2a7c7190c 303 /* for that, move payload to IP header again */
GordonSin 0:0ed2a7c7190c 304 if (p_header_changed == 0) {
GordonSin 0:0ed2a7c7190c 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
GordonSin 0:0ed2a7c7190c 306 p_header_changed = 1;
GordonSin 0:0ed2a7c7190c 307 }
GordonSin 0:0ed2a7c7190c 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
GordonSin 0:0ed2a7c7190c 309 if (q != NULL) {
GordonSin 0:0ed2a7c7190c 310 err_t err = pbuf_copy(q, p);
GordonSin 0:0ed2a7c7190c 311 if (err == ERR_OK) {
GordonSin 0:0ed2a7c7190c 312 /* move payload to UDP data */
GordonSin 0:0ed2a7c7190c 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
GordonSin 0:0ed2a7c7190c 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
GordonSin 0:0ed2a7c7190c 315 }
GordonSin 0:0ed2a7c7190c 316 }
GordonSin 0:0ed2a7c7190c 317 }
GordonSin 0:0ed2a7c7190c 318 }
GordonSin 0:0ed2a7c7190c 319 }
GordonSin 0:0ed2a7c7190c 320 }
GordonSin 0:0ed2a7c7190c 321 if (p_header_changed) {
GordonSin 0:0ed2a7c7190c 322 /* and move payload to UDP data again */
GordonSin 0:0ed2a7c7190c 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
GordonSin 0:0ed2a7c7190c 324 }
GordonSin 0:0ed2a7c7190c 325 }
GordonSin 0:0ed2a7c7190c 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
GordonSin 0:0ed2a7c7190c 327 /* callback */
GordonSin 0:0ed2a7c7190c 328 if (pcb->recv != NULL) {
GordonSin 0:0ed2a7c7190c 329 /* now the recv function is responsible for freeing p */
GordonSin 0:0ed2a7c7190c 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
GordonSin 0:0ed2a7c7190c 331 } else {
GordonSin 0:0ed2a7c7190c 332 /* no recv function registered? then we have to free the pbuf! */
GordonSin 0:0ed2a7c7190c 333 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 334 goto end;
GordonSin 0:0ed2a7c7190c 335 }
GordonSin 0:0ed2a7c7190c 336 } else {
GordonSin 0:0ed2a7c7190c 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
GordonSin 0:0ed2a7c7190c 338
GordonSin 0:0ed2a7c7190c 339 #if LWIP_ICMP
GordonSin 0:0ed2a7c7190c 340 /* No match was found, send ICMP destination port unreachable unless
GordonSin 0:0ed2a7c7190c 341 destination address was broadcast/multicast. */
GordonSin 0:0ed2a7c7190c 342 if (!broadcast &&
GordonSin 0:0ed2a7c7190c 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
GordonSin 0:0ed2a7c7190c 344 /* move payload pointer back to ip header */
GordonSin 0:0ed2a7c7190c 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
GordonSin 0:0ed2a7c7190c 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
GordonSin 0:0ed2a7c7190c 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
GordonSin 0:0ed2a7c7190c 348 }
GordonSin 0:0ed2a7c7190c 349 #endif /* LWIP_ICMP */
GordonSin 0:0ed2a7c7190c 350 UDP_STATS_INC(udp.proterr);
GordonSin 0:0ed2a7c7190c 351 UDP_STATS_INC(udp.drop);
GordonSin 0:0ed2a7c7190c 352 snmp_inc_udpnoports();
GordonSin 0:0ed2a7c7190c 353 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 354 }
GordonSin 0:0ed2a7c7190c 355 } else {
GordonSin 0:0ed2a7c7190c 356 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 357 }
GordonSin 0:0ed2a7c7190c 358 end:
GordonSin 0:0ed2a7c7190c 359 PERF_STOP("udp_input");
GordonSin 0:0ed2a7c7190c 360 }
GordonSin 0:0ed2a7c7190c 361
GordonSin 0:0ed2a7c7190c 362 /**
GordonSin 0:0ed2a7c7190c 363 * Send data using UDP.
GordonSin 0:0ed2a7c7190c 364 *
GordonSin 0:0ed2a7c7190c 365 * @param pcb UDP PCB used to send the data.
GordonSin 0:0ed2a7c7190c 366 * @param p chain of pbuf's to be sent.
GordonSin 0:0ed2a7c7190c 367 *
GordonSin 0:0ed2a7c7190c 368 * The datagram will be sent to the current remote_ip & remote_port
GordonSin 0:0ed2a7c7190c 369 * stored in pcb. If the pcb is not bound to a port, it will
GordonSin 0:0ed2a7c7190c 370 * automatically be bound to a random port.
GordonSin 0:0ed2a7c7190c 371 *
GordonSin 0:0ed2a7c7190c 372 * @return lwIP error code.
GordonSin 0:0ed2a7c7190c 373 * - ERR_OK. Successful. No error occured.
GordonSin 0:0ed2a7c7190c 374 * - ERR_MEM. Out of memory.
GordonSin 0:0ed2a7c7190c 375 * - ERR_RTE. Could not find route to destination address.
GordonSin 0:0ed2a7c7190c 376 * - More errors could be returned by lower protocol layers.
GordonSin 0:0ed2a7c7190c 377 *
GordonSin 0:0ed2a7c7190c 378 * @see udp_disconnect() udp_sendto()
GordonSin 0:0ed2a7c7190c 379 */
GordonSin 0:0ed2a7c7190c 380 err_t
GordonSin 0:0ed2a7c7190c 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
GordonSin 0:0ed2a7c7190c 382 {
GordonSin 0:0ed2a7c7190c 383 /* send to the packet using remote ip and port stored in the pcb */
GordonSin 0:0ed2a7c7190c 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
GordonSin 0:0ed2a7c7190c 385 }
GordonSin 0:0ed2a7c7190c 386
GordonSin 0:0ed2a7c7190c 387 #if LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 388 /** Same as udp_send() but with checksum
GordonSin 0:0ed2a7c7190c 389 */
GordonSin 0:0ed2a7c7190c 390 err_t
GordonSin 0:0ed2a7c7190c 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
GordonSin 0:0ed2a7c7190c 392 u8_t have_chksum, u16_t chksum)
GordonSin 0:0ed2a7c7190c 393 {
GordonSin 0:0ed2a7c7190c 394 /* send to the packet using remote ip and port stored in the pcb */
GordonSin 0:0ed2a7c7190c 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
GordonSin 0:0ed2a7c7190c 396 have_chksum, chksum);
GordonSin 0:0ed2a7c7190c 397 }
GordonSin 0:0ed2a7c7190c 398 #endif /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 399
GordonSin 0:0ed2a7c7190c 400 /**
GordonSin 0:0ed2a7c7190c 401 * Send data to a specified address using UDP.
GordonSin 0:0ed2a7c7190c 402 *
GordonSin 0:0ed2a7c7190c 403 * @param pcb UDP PCB used to send the data.
GordonSin 0:0ed2a7c7190c 404 * @param p chain of pbuf's to be sent.
GordonSin 0:0ed2a7c7190c 405 * @param dst_ip Destination IP address.
GordonSin 0:0ed2a7c7190c 406 * @param dst_port Destination UDP port.
GordonSin 0:0ed2a7c7190c 407 *
GordonSin 0:0ed2a7c7190c 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
GordonSin 0:0ed2a7c7190c 409 *
GordonSin 0:0ed2a7c7190c 410 * If the PCB already has a remote address association, it will
GordonSin 0:0ed2a7c7190c 411 * be restored after the data is sent.
GordonSin 0:0ed2a7c7190c 412 *
GordonSin 0:0ed2a7c7190c 413 * @return lwIP error code (@see udp_send for possible error codes)
GordonSin 0:0ed2a7c7190c 414 *
GordonSin 0:0ed2a7c7190c 415 * @see udp_disconnect() udp_send()
GordonSin 0:0ed2a7c7190c 416 */
GordonSin 0:0ed2a7c7190c 417 err_t
GordonSin 0:0ed2a7c7190c 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
GordonSin 0:0ed2a7c7190c 419 ip_addr_t *dst_ip, u16_t dst_port)
GordonSin 0:0ed2a7c7190c 420 {
GordonSin 0:0ed2a7c7190c 421 #if LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
GordonSin 0:0ed2a7c7190c 423 }
GordonSin 0:0ed2a7c7190c 424
GordonSin 0:0ed2a7c7190c 425 /** Same as udp_sendto(), but with checksum */
GordonSin 0:0ed2a7c7190c 426 err_t
GordonSin 0:0ed2a7c7190c 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
GordonSin 0:0ed2a7c7190c 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
GordonSin 0:0ed2a7c7190c 429 {
GordonSin 0:0ed2a7c7190c 430 #endif /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 431 struct netif *netif;
GordonSin 0:0ed2a7c7190c 432
GordonSin 0:0ed2a7c7190c 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
GordonSin 0:0ed2a7c7190c 434
GordonSin 0:0ed2a7c7190c 435 /* find the outgoing network interface for this packet */
GordonSin 0:0ed2a7c7190c 436 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
GordonSin 0:0ed2a7c7190c 438 #else
GordonSin 0:0ed2a7c7190c 439 netif = ip_route(dst_ip);
GordonSin 0:0ed2a7c7190c 440 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 441
GordonSin 0:0ed2a7c7190c 442 /* no outgoing network interface could be found? */
GordonSin 0:0ed2a7c7190c 443 if (netif == NULL) {
GordonSin 0:0ed2a7c7190c 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
GordonSin 0:0ed2a7c7190c 446 UDP_STATS_INC(udp.rterr);
GordonSin 0:0ed2a7c7190c 447 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 448 }
GordonSin 0:0ed2a7c7190c 449 #if LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
GordonSin 0:0ed2a7c7190c 451 #else /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
GordonSin 0:0ed2a7c7190c 453 #endif /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 454 }
GordonSin 0:0ed2a7c7190c 455
GordonSin 0:0ed2a7c7190c 456 /**
GordonSin 0:0ed2a7c7190c 457 * Send data to a specified address using UDP.
GordonSin 0:0ed2a7c7190c 458 * The netif used for sending can be specified.
GordonSin 0:0ed2a7c7190c 459 *
GordonSin 0:0ed2a7c7190c 460 * This function exists mainly for DHCP, to be able to send UDP packets
GordonSin 0:0ed2a7c7190c 461 * on a netif that is still down.
GordonSin 0:0ed2a7c7190c 462 *
GordonSin 0:0ed2a7c7190c 463 * @param pcb UDP PCB used to send the data.
GordonSin 0:0ed2a7c7190c 464 * @param p chain of pbuf's to be sent.
GordonSin 0:0ed2a7c7190c 465 * @param dst_ip Destination IP address.
GordonSin 0:0ed2a7c7190c 466 * @param dst_port Destination UDP port.
GordonSin 0:0ed2a7c7190c 467 * @param netif the netif used for sending.
GordonSin 0:0ed2a7c7190c 468 *
GordonSin 0:0ed2a7c7190c 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
GordonSin 0:0ed2a7c7190c 470 *
GordonSin 0:0ed2a7c7190c 471 * @return lwIP error code (@see udp_send for possible error codes)
GordonSin 0:0ed2a7c7190c 472 *
GordonSin 0:0ed2a7c7190c 473 * @see udp_disconnect() udp_send()
GordonSin 0:0ed2a7c7190c 474 */
GordonSin 0:0ed2a7c7190c 475 err_t
GordonSin 0:0ed2a7c7190c 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
GordonSin 0:0ed2a7c7190c 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
GordonSin 0:0ed2a7c7190c 478 {
GordonSin 0:0ed2a7c7190c 479 #if LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
GordonSin 0:0ed2a7c7190c 481 }
GordonSin 0:0ed2a7c7190c 482
GordonSin 0:0ed2a7c7190c 483 /** Same as udp_sendto_if(), but with checksum */
GordonSin 0:0ed2a7c7190c 484 err_t
GordonSin 0:0ed2a7c7190c 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
GordonSin 0:0ed2a7c7190c 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
GordonSin 0:0ed2a7c7190c 487 u16_t chksum)
GordonSin 0:0ed2a7c7190c 488 {
GordonSin 0:0ed2a7c7190c 489 #endif /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 490 struct udp_hdr *udphdr;
GordonSin 0:0ed2a7c7190c 491 ip_addr_t *src_ip;
GordonSin 0:0ed2a7c7190c 492 err_t err;
GordonSin 0:0ed2a7c7190c 493 struct pbuf *q; /* q will be sent down the stack */
GordonSin 0:0ed2a7c7190c 494
GordonSin 0:0ed2a7c7190c 495 #if IP_SOF_BROADCAST
GordonSin 0:0ed2a7c7190c 496 /* broadcast filter? */
GordonSin 0:0ed2a7c7190c 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
GordonSin 0:0ed2a7c7190c 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
GordonSin 0:0ed2a7c7190c 500 return ERR_VAL;
GordonSin 0:0ed2a7c7190c 501 }
GordonSin 0:0ed2a7c7190c 502 #endif /* IP_SOF_BROADCAST */
GordonSin 0:0ed2a7c7190c 503
GordonSin 0:0ed2a7c7190c 504 /* if the PCB is not yet bound to a port, bind it here */
GordonSin 0:0ed2a7c7190c 505 if (pcb->local_port == 0) {
GordonSin 0:0ed2a7c7190c 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
GordonSin 0:0ed2a7c7190c 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
GordonSin 0:0ed2a7c7190c 508 if (err != ERR_OK) {
GordonSin 0:0ed2a7c7190c 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
GordonSin 0:0ed2a7c7190c 510 return err;
GordonSin 0:0ed2a7c7190c 511 }
GordonSin 0:0ed2a7c7190c 512 }
GordonSin 0:0ed2a7c7190c 513
GordonSin 0:0ed2a7c7190c 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
GordonSin 0:0ed2a7c7190c 515 if (pbuf_header(p, UDP_HLEN)) {
GordonSin 0:0ed2a7c7190c 516 /* allocate header in a separate new pbuf */
GordonSin 0:0ed2a7c7190c 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
GordonSin 0:0ed2a7c7190c 518 /* new header pbuf could not be allocated? */
GordonSin 0:0ed2a7c7190c 519 if (q == NULL) {
GordonSin 0:0ed2a7c7190c 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
GordonSin 0:0ed2a7c7190c 521 return ERR_MEM;
GordonSin 0:0ed2a7c7190c 522 }
GordonSin 0:0ed2a7c7190c 523 if (p->tot_len != 0) {
GordonSin 0:0ed2a7c7190c 524 /* chain header q in front of given pbuf p (only if p contains data) */
GordonSin 0:0ed2a7c7190c 525 pbuf_chain(q, p);
GordonSin 0:0ed2a7c7190c 526 }
GordonSin 0:0ed2a7c7190c 527 /* first pbuf q points to header pbuf */
GordonSin 0:0ed2a7c7190c 528 LWIP_DEBUGF(UDP_DEBUG,
GordonSin 0:0ed2a7c7190c 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
GordonSin 0:0ed2a7c7190c 530 } else {
GordonSin 0:0ed2a7c7190c 531 /* adding space for header within p succeeded */
GordonSin 0:0ed2a7c7190c 532 /* first pbuf q equals given pbuf */
GordonSin 0:0ed2a7c7190c 533 q = p;
GordonSin 0:0ed2a7c7190c 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
GordonSin 0:0ed2a7c7190c 535 }
GordonSin 0:0ed2a7c7190c 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
GordonSin 0:0ed2a7c7190c 537 (q->len >= sizeof(struct udp_hdr)));
GordonSin 0:0ed2a7c7190c 538 /* q now represents the packet to be sent */
GordonSin 0:0ed2a7c7190c 539 udphdr = (struct udp_hdr *)q->payload;
GordonSin 0:0ed2a7c7190c 540 udphdr->src = htons(pcb->local_port);
GordonSin 0:0ed2a7c7190c 541 udphdr->dest = htons(dst_port);
GordonSin 0:0ed2a7c7190c 542 /* in UDP, 0 checksum means 'no checksum' */
GordonSin 0:0ed2a7c7190c 543 udphdr->chksum = 0x0000;
GordonSin 0:0ed2a7c7190c 544
GordonSin 0:0ed2a7c7190c 545 /* Multicast Loop? */
GordonSin 0:0ed2a7c7190c 546 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
GordonSin 0:0ed2a7c7190c 548 q->flags |= PBUF_FLAG_MCASTLOOP;
GordonSin 0:0ed2a7c7190c 549 }
GordonSin 0:0ed2a7c7190c 550 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 551
GordonSin 0:0ed2a7c7190c 552
GordonSin 0:0ed2a7c7190c 553 /* PCB local address is IP_ANY_ADDR? */
GordonSin 0:0ed2a7c7190c 554 if (ip_addr_isany(&pcb->local_ip)) {
GordonSin 0:0ed2a7c7190c 555 /* use outgoing network interface IP address as source address */
GordonSin 0:0ed2a7c7190c 556 src_ip = &(netif->ip_addr);
GordonSin 0:0ed2a7c7190c 557 } else {
GordonSin 0:0ed2a7c7190c 558 /* check if UDP PCB local IP address is correct
GordonSin 0:0ed2a7c7190c 559 * this could be an old address if netif->ip_addr has changed */
GordonSin 0:0ed2a7c7190c 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
GordonSin 0:0ed2a7c7190c 561 /* local_ip doesn't match, drop the packet */
GordonSin 0:0ed2a7c7190c 562 if (q != p) {
GordonSin 0:0ed2a7c7190c 563 /* free the header pbuf */
GordonSin 0:0ed2a7c7190c 564 pbuf_free(q);
GordonSin 0:0ed2a7c7190c 565 q = NULL;
GordonSin 0:0ed2a7c7190c 566 /* p is still referenced by the caller, and will live on */
GordonSin 0:0ed2a7c7190c 567 }
GordonSin 0:0ed2a7c7190c 568 return ERR_VAL;
GordonSin 0:0ed2a7c7190c 569 }
GordonSin 0:0ed2a7c7190c 570 /* use UDP PCB local IP address as source address */
GordonSin 0:0ed2a7c7190c 571 src_ip = &(pcb->local_ip);
GordonSin 0:0ed2a7c7190c 572 }
GordonSin 0:0ed2a7c7190c 573
GordonSin 0:0ed2a7c7190c 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
GordonSin 0:0ed2a7c7190c 575
GordonSin 0:0ed2a7c7190c 576 #if LWIP_UDPLITE
GordonSin 0:0ed2a7c7190c 577 /* UDP Lite protocol? */
GordonSin 0:0ed2a7c7190c 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
GordonSin 0:0ed2a7c7190c 579 u16_t chklen, chklen_hdr;
GordonSin 0:0ed2a7c7190c 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
GordonSin 0:0ed2a7c7190c 581 /* set UDP message length in UDP header */
GordonSin 0:0ed2a7c7190c 582 chklen_hdr = chklen = pcb->chksum_len_tx;
GordonSin 0:0ed2a7c7190c 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
GordonSin 0:0ed2a7c7190c 584 if (chklen != 0) {
GordonSin 0:0ed2a7c7190c 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
GordonSin 0:0ed2a7c7190c 586 }
GordonSin 0:0ed2a7c7190c 587 /* For UDP-Lite, checksum length of 0 means checksum
GordonSin 0:0ed2a7c7190c 588 over the complete packet. (See RFC 3828 chap. 3.1)
GordonSin 0:0ed2a7c7190c 589 At least the UDP-Lite header must be covered by the
GordonSin 0:0ed2a7c7190c 590 checksum, therefore, if chksum_len has an illegal
GordonSin 0:0ed2a7c7190c 591 value, we generate the checksum over the complete
GordonSin 0:0ed2a7c7190c 592 packet to be safe. */
GordonSin 0:0ed2a7c7190c 593 chklen_hdr = 0;
GordonSin 0:0ed2a7c7190c 594 chklen = q->tot_len;
GordonSin 0:0ed2a7c7190c 595 }
GordonSin 0:0ed2a7c7190c 596 udphdr->len = htons(chklen_hdr);
GordonSin 0:0ed2a7c7190c 597 /* calculate checksum */
GordonSin 0:0ed2a7c7190c 598 #if CHECKSUM_GEN_UDP
GordonSin 0:0ed2a7c7190c 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
GordonSin 0:0ed2a7c7190c 600 IP_PROTO_UDPLITE, q->tot_len,
GordonSin 0:0ed2a7c7190c 601 #if !LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 602 chklen);
GordonSin 0:0ed2a7c7190c 603 #else /* !LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 604 (have_chksum ? UDP_HLEN : chklen));
GordonSin 0:0ed2a7c7190c 605 if (have_chksum) {
GordonSin 0:0ed2a7c7190c 606 u32_t acc;
GordonSin 0:0ed2a7c7190c 607 acc = udphdr->chksum + (u16_t)~(chksum);
GordonSin 0:0ed2a7c7190c 608 udphdr->chksum = FOLD_U32T(acc);
GordonSin 0:0ed2a7c7190c 609 }
GordonSin 0:0ed2a7c7190c 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 611
GordonSin 0:0ed2a7c7190c 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
GordonSin 0:0ed2a7c7190c 613 if (udphdr->chksum == 0x0000) {
GordonSin 0:0ed2a7c7190c 614 udphdr->chksum = 0xffff;
GordonSin 0:0ed2a7c7190c 615 }
GordonSin 0:0ed2a7c7190c 616 #endif /* CHECKSUM_GEN_UDP */
GordonSin 0:0ed2a7c7190c 617 /* output to IP */
GordonSin 0:0ed2a7c7190c 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
GordonSin 0:0ed2a7c7190c 619 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 620 netif->addr_hint = &(pcb->addr_hint);
GordonSin 0:0ed2a7c7190c 621 #endif /* LWIP_NETIF_HWADDRHINT*/
GordonSin 0:0ed2a7c7190c 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
GordonSin 0:0ed2a7c7190c 623 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 624 netif->addr_hint = NULL;
GordonSin 0:0ed2a7c7190c 625 #endif /* LWIP_NETIF_HWADDRHINT*/
GordonSin 0:0ed2a7c7190c 626 } else
GordonSin 0:0ed2a7c7190c 627 #endif /* LWIP_UDPLITE */
GordonSin 0:0ed2a7c7190c 628 { /* UDP */
GordonSin 0:0ed2a7c7190c 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
GordonSin 0:0ed2a7c7190c 630 udphdr->len = htons(q->tot_len);
GordonSin 0:0ed2a7c7190c 631 /* calculate checksum */
GordonSin 0:0ed2a7c7190c 632 #if CHECKSUM_GEN_UDP
GordonSin 0:0ed2a7c7190c 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
GordonSin 0:0ed2a7c7190c 634 u16_t udpchksum;
GordonSin 0:0ed2a7c7190c 635 #if LWIP_CHECKSUM_ON_COPY
GordonSin 0:0ed2a7c7190c 636 if (have_chksum) {
GordonSin 0:0ed2a7c7190c 637 u32_t acc;
GordonSin 0:0ed2a7c7190c 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
GordonSin 0:0ed2a7c7190c 639 q->tot_len, UDP_HLEN);
GordonSin 0:0ed2a7c7190c 640 acc = udpchksum + (u16_t)~(chksum);
GordonSin 0:0ed2a7c7190c 641 udpchksum = FOLD_U32T(acc);
GordonSin 0:0ed2a7c7190c 642 } else
GordonSin 0:0ed2a7c7190c 643 #endif /* LWIP_CHECKSUM_ON_COPY */
GordonSin 0:0ed2a7c7190c 644 {
GordonSin 0:0ed2a7c7190c 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
GordonSin 0:0ed2a7c7190c 646 }
GordonSin 0:0ed2a7c7190c 647
GordonSin 0:0ed2a7c7190c 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
GordonSin 0:0ed2a7c7190c 649 if (udpchksum == 0x0000) {
GordonSin 0:0ed2a7c7190c 650 udpchksum = 0xffff;
GordonSin 0:0ed2a7c7190c 651 }
GordonSin 0:0ed2a7c7190c 652 udphdr->chksum = udpchksum;
GordonSin 0:0ed2a7c7190c 653 }
GordonSin 0:0ed2a7c7190c 654 #endif /* CHECKSUM_GEN_UDP */
GordonSin 0:0ed2a7c7190c 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
GordonSin 0:0ed2a7c7190c 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
GordonSin 0:0ed2a7c7190c 657 /* output to IP */
GordonSin 0:0ed2a7c7190c 658 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 659 netif->addr_hint = &(pcb->addr_hint);
GordonSin 0:0ed2a7c7190c 660 #endif /* LWIP_NETIF_HWADDRHINT*/
GordonSin 0:0ed2a7c7190c 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
GordonSin 0:0ed2a7c7190c 662 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 663 netif->addr_hint = NULL;
GordonSin 0:0ed2a7c7190c 664 #endif /* LWIP_NETIF_HWADDRHINT*/
GordonSin 0:0ed2a7c7190c 665 }
GordonSin 0:0ed2a7c7190c 666 /* TODO: must this be increased even if error occured? */
GordonSin 0:0ed2a7c7190c 667 snmp_inc_udpoutdatagrams();
GordonSin 0:0ed2a7c7190c 668
GordonSin 0:0ed2a7c7190c 669 /* did we chain a separate header pbuf earlier? */
GordonSin 0:0ed2a7c7190c 670 if (q != p) {
GordonSin 0:0ed2a7c7190c 671 /* free the header pbuf */
GordonSin 0:0ed2a7c7190c 672 pbuf_free(q);
GordonSin 0:0ed2a7c7190c 673 q = NULL;
GordonSin 0:0ed2a7c7190c 674 /* p is still referenced by the caller, and will live on */
GordonSin 0:0ed2a7c7190c 675 }
GordonSin 0:0ed2a7c7190c 676
GordonSin 0:0ed2a7c7190c 677 UDP_STATS_INC(udp.xmit);
GordonSin 0:0ed2a7c7190c 678 return err;
GordonSin 0:0ed2a7c7190c 679 }
GordonSin 0:0ed2a7c7190c 680
GordonSin 0:0ed2a7c7190c 681 /**
GordonSin 0:0ed2a7c7190c 682 * Bind an UDP PCB.
GordonSin 0:0ed2a7c7190c 683 *
GordonSin 0:0ed2a7c7190c 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
GordonSin 0:0ed2a7c7190c 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
GordonSin 0:0ed2a7c7190c 686 * bind to all local interfaces.
GordonSin 0:0ed2a7c7190c 687 * @param port local UDP port to bind with. Use 0 to automatically bind
GordonSin 0:0ed2a7c7190c 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
GordonSin 0:0ed2a7c7190c 689 * UDP_LOCAL_PORT_RANGE_END.
GordonSin 0:0ed2a7c7190c 690 *
GordonSin 0:0ed2a7c7190c 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
GordonSin 0:0ed2a7c7190c 692 *
GordonSin 0:0ed2a7c7190c 693 * @return lwIP error code.
GordonSin 0:0ed2a7c7190c 694 * - ERR_OK. Successful. No error occured.
GordonSin 0:0ed2a7c7190c 695 * - ERR_USE. The specified ipaddr and port are already bound to by
GordonSin 0:0ed2a7c7190c 696 * another UDP PCB.
GordonSin 0:0ed2a7c7190c 697 *
GordonSin 0:0ed2a7c7190c 698 * @see udp_disconnect()
GordonSin 0:0ed2a7c7190c 699 */
GordonSin 0:0ed2a7c7190c 700 err_t
GordonSin 0:0ed2a7c7190c 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
GordonSin 0:0ed2a7c7190c 702 {
GordonSin 0:0ed2a7c7190c 703 struct udp_pcb *ipcb;
GordonSin 0:0ed2a7c7190c 704 u8_t rebind;
GordonSin 0:0ed2a7c7190c 705
GordonSin 0:0ed2a7c7190c 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
GordonSin 0:0ed2a7c7190c 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
GordonSin 0:0ed2a7c7190c 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
GordonSin 0:0ed2a7c7190c 709
GordonSin 0:0ed2a7c7190c 710 rebind = 0;
GordonSin 0:0ed2a7c7190c 711 /* Check for double bind and rebind of the same pcb */
GordonSin 0:0ed2a7c7190c 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
GordonSin 0:0ed2a7c7190c 713 /* is this UDP PCB already on active list? */
GordonSin 0:0ed2a7c7190c 714 if (pcb == ipcb) {
GordonSin 0:0ed2a7c7190c 715 /* pcb may occur at most once in active list */
GordonSin 0:0ed2a7c7190c 716 LWIP_ASSERT("rebind == 0", rebind == 0);
GordonSin 0:0ed2a7c7190c 717 /* pcb already in list, just rebind */
GordonSin 0:0ed2a7c7190c 718 rebind = 1;
GordonSin 0:0ed2a7c7190c 719 }
GordonSin 0:0ed2a7c7190c 720
GordonSin 0:0ed2a7c7190c 721 /* By default, we don't allow to bind to a port that any other udp
GordonSin 0:0ed2a7c7190c 722 PCB is alread bound to, unless *all* PCBs with that port have tha
GordonSin 0:0ed2a7c7190c 723 REUSEADDR flag set. */
GordonSin 0:0ed2a7c7190c 724 #if SO_REUSE
GordonSin 0:0ed2a7c7190c 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
GordonSin 0:0ed2a7c7190c 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
GordonSin 0:0ed2a7c7190c 727 #else /* SO_REUSE */
GordonSin 0:0ed2a7c7190c 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
GordonSin 0:0ed2a7c7190c 729 else {
GordonSin 0:0ed2a7c7190c 730 #endif /* SO_REUSE */
GordonSin 0:0ed2a7c7190c 731 if ((ipcb->local_port == port) &&
GordonSin 0:0ed2a7c7190c 732 /* IP address matches, or one is IP_ADDR_ANY? */
GordonSin 0:0ed2a7c7190c 733 (ip_addr_isany(&(ipcb->local_ip)) ||
GordonSin 0:0ed2a7c7190c 734 ip_addr_isany(ipaddr) ||
GordonSin 0:0ed2a7c7190c 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
GordonSin 0:0ed2a7c7190c 736 /* other PCB already binds to this local IP and port */
GordonSin 0:0ed2a7c7190c 737 LWIP_DEBUGF(UDP_DEBUG,
GordonSin 0:0ed2a7c7190c 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
GordonSin 0:0ed2a7c7190c 739 return ERR_USE;
GordonSin 0:0ed2a7c7190c 740 }
GordonSin 0:0ed2a7c7190c 741 }
GordonSin 0:0ed2a7c7190c 742 }
GordonSin 0:0ed2a7c7190c 743
GordonSin 0:0ed2a7c7190c 744 ip_addr_set(&pcb->local_ip, ipaddr);
GordonSin 0:0ed2a7c7190c 745
GordonSin 0:0ed2a7c7190c 746 /* no port specified? */
GordonSin 0:0ed2a7c7190c 747 if (port == 0) {
GordonSin 0:0ed2a7c7190c 748 #ifndef UDP_LOCAL_PORT_RANGE_START
GordonSin 0:0ed2a7c7190c 749 /* From http://www.iana.org/assignments/port-numbers:
GordonSin 0:0ed2a7c7190c 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
GordonSin 0:0ed2a7c7190c 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
GordonSin 0:0ed2a7c7190c 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
GordonSin 0:0ed2a7c7190c 753 #endif
GordonSin 0:0ed2a7c7190c 754 port = UDP_LOCAL_PORT_RANGE_START;
GordonSin 0:0ed2a7c7190c 755 ipcb = udp_pcbs;
GordonSin 0:0ed2a7c7190c 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
GordonSin 0:0ed2a7c7190c 757 if (ipcb->local_port == port) {
GordonSin 0:0ed2a7c7190c 758 /* port is already used by another udp_pcb */
GordonSin 0:0ed2a7c7190c 759 port++;
GordonSin 0:0ed2a7c7190c 760 /* restart scanning all udp pcbs */
GordonSin 0:0ed2a7c7190c 761 ipcb = udp_pcbs;
GordonSin 0:0ed2a7c7190c 762 } else {
GordonSin 0:0ed2a7c7190c 763 /* go on with next udp pcb */
GordonSin 0:0ed2a7c7190c 764 ipcb = ipcb->next;
GordonSin 0:0ed2a7c7190c 765 }
GordonSin 0:0ed2a7c7190c 766 }
GordonSin 0:0ed2a7c7190c 767 if (ipcb != NULL) {
GordonSin 0:0ed2a7c7190c 768 /* no more ports available in local range */
GordonSin 0:0ed2a7c7190c 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
GordonSin 0:0ed2a7c7190c 770 return ERR_USE;
GordonSin 0:0ed2a7c7190c 771 }
GordonSin 0:0ed2a7c7190c 772 }
GordonSin 0:0ed2a7c7190c 773 pcb->local_port = port;
GordonSin 0:0ed2a7c7190c 774 snmp_insert_udpidx_tree(pcb);
GordonSin 0:0ed2a7c7190c 775 /* pcb not active yet? */
GordonSin 0:0ed2a7c7190c 776 if (rebind == 0) {
GordonSin 0:0ed2a7c7190c 777 /* place the PCB on the active list if not already there */
GordonSin 0:0ed2a7c7190c 778 pcb->next = udp_pcbs;
GordonSin 0:0ed2a7c7190c 779 udp_pcbs = pcb;
GordonSin 0:0ed2a7c7190c 780 }
GordonSin 0:0ed2a7c7190c 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
GordonSin 0:0ed2a7c7190c 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
GordonSin 0:0ed2a7c7190c 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
GordonSin 0:0ed2a7c7190c 785 pcb->local_port));
GordonSin 0:0ed2a7c7190c 786 return ERR_OK;
GordonSin 0:0ed2a7c7190c 787 }
GordonSin 0:0ed2a7c7190c 788 /**
GordonSin 0:0ed2a7c7190c 789 * Connect an UDP PCB.
GordonSin 0:0ed2a7c7190c 790 *
GordonSin 0:0ed2a7c7190c 791 * This will associate the UDP PCB with the remote address.
GordonSin 0:0ed2a7c7190c 792 *
GordonSin 0:0ed2a7c7190c 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
GordonSin 0:0ed2a7c7190c 794 * @param ipaddr remote IP address to connect with.
GordonSin 0:0ed2a7c7190c 795 * @param port remote UDP port to connect with.
GordonSin 0:0ed2a7c7190c 796 *
GordonSin 0:0ed2a7c7190c 797 * @return lwIP error code
GordonSin 0:0ed2a7c7190c 798 *
GordonSin 0:0ed2a7c7190c 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
GordonSin 0:0ed2a7c7190c 800 *
GordonSin 0:0ed2a7c7190c 801 * The udp pcb is bound to a random local port if not already bound.
GordonSin 0:0ed2a7c7190c 802 *
GordonSin 0:0ed2a7c7190c 803 * @see udp_disconnect()
GordonSin 0:0ed2a7c7190c 804 */
GordonSin 0:0ed2a7c7190c 805 err_t
GordonSin 0:0ed2a7c7190c 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
GordonSin 0:0ed2a7c7190c 807 {
GordonSin 0:0ed2a7c7190c 808 struct udp_pcb *ipcb;
GordonSin 0:0ed2a7c7190c 809
GordonSin 0:0ed2a7c7190c 810 if (pcb->local_port == 0) {
GordonSin 0:0ed2a7c7190c 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
GordonSin 0:0ed2a7c7190c 812 if (err != ERR_OK) {
GordonSin 0:0ed2a7c7190c 813 return err;
GordonSin 0:0ed2a7c7190c 814 }
GordonSin 0:0ed2a7c7190c 815 }
GordonSin 0:0ed2a7c7190c 816
GordonSin 0:0ed2a7c7190c 817 ip_addr_set(&pcb->remote_ip, ipaddr);
GordonSin 0:0ed2a7c7190c 818 pcb->remote_port = port;
GordonSin 0:0ed2a7c7190c 819 pcb->flags |= UDP_FLAGS_CONNECTED;
GordonSin 0:0ed2a7c7190c 820 /** TODO: this functionality belongs in upper layers */
GordonSin 0:0ed2a7c7190c 821 #ifdef LWIP_UDP_TODO
GordonSin 0:0ed2a7c7190c 822 /* Nail down local IP for netconn_addr()/getsockname() */
GordonSin 0:0ed2a7c7190c 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
GordonSin 0:0ed2a7c7190c 824 struct netif *netif;
GordonSin 0:0ed2a7c7190c 825
GordonSin 0:0ed2a7c7190c 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
GordonSin 0:0ed2a7c7190c 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
GordonSin 0:0ed2a7c7190c 828 UDP_STATS_INC(udp.rterr);
GordonSin 0:0ed2a7c7190c 829 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 830 }
GordonSin 0:0ed2a7c7190c 831 /** TODO: this will bind the udp pcb locally, to the interface which
GordonSin 0:0ed2a7c7190c 832 is used to route output packets to the remote address. However, we
GordonSin 0:0ed2a7c7190c 833 might want to accept incoming packets on any interface! */
GordonSin 0:0ed2a7c7190c 834 pcb->local_ip = netif->ip_addr;
GordonSin 0:0ed2a7c7190c 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
GordonSin 0:0ed2a7c7190c 836 pcb->local_ip.addr = 0;
GordonSin 0:0ed2a7c7190c 837 }
GordonSin 0:0ed2a7c7190c 838 #endif
GordonSin 0:0ed2a7c7190c 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
GordonSin 0:0ed2a7c7190c 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
GordonSin 0:0ed2a7c7190c 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
GordonSin 0:0ed2a7c7190c 843 pcb->local_port));
GordonSin 0:0ed2a7c7190c 844
GordonSin 0:0ed2a7c7190c 845 /* Insert UDP PCB into the list of active UDP PCBs. */
GordonSin 0:0ed2a7c7190c 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
GordonSin 0:0ed2a7c7190c 847 if (pcb == ipcb) {
GordonSin 0:0ed2a7c7190c 848 /* already on the list, just return */
GordonSin 0:0ed2a7c7190c 849 return ERR_OK;
GordonSin 0:0ed2a7c7190c 850 }
GordonSin 0:0ed2a7c7190c 851 }
GordonSin 0:0ed2a7c7190c 852 /* PCB not yet on the list, add PCB now */
GordonSin 0:0ed2a7c7190c 853 pcb->next = udp_pcbs;
GordonSin 0:0ed2a7c7190c 854 udp_pcbs = pcb;
GordonSin 0:0ed2a7c7190c 855 return ERR_OK;
GordonSin 0:0ed2a7c7190c 856 }
GordonSin 0:0ed2a7c7190c 857
GordonSin 0:0ed2a7c7190c 858 /**
GordonSin 0:0ed2a7c7190c 859 * Disconnect a UDP PCB
GordonSin 0:0ed2a7c7190c 860 *
GordonSin 0:0ed2a7c7190c 861 * @param pcb the udp pcb to disconnect.
GordonSin 0:0ed2a7c7190c 862 */
GordonSin 0:0ed2a7c7190c 863 void
GordonSin 0:0ed2a7c7190c 864 udp_disconnect(struct udp_pcb *pcb)
GordonSin 0:0ed2a7c7190c 865 {
GordonSin 0:0ed2a7c7190c 866 /* reset remote address association */
GordonSin 0:0ed2a7c7190c 867 ip_addr_set_any(&pcb->remote_ip);
GordonSin 0:0ed2a7c7190c 868 pcb->remote_port = 0;
GordonSin 0:0ed2a7c7190c 869 /* mark PCB as unconnected */
GordonSin 0:0ed2a7c7190c 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
GordonSin 0:0ed2a7c7190c 871 }
GordonSin 0:0ed2a7c7190c 872
GordonSin 0:0ed2a7c7190c 873 /**
GordonSin 0:0ed2a7c7190c 874 * Set a receive callback for a UDP PCB
GordonSin 0:0ed2a7c7190c 875 *
GordonSin 0:0ed2a7c7190c 876 * This callback will be called when receiving a datagram for the pcb.
GordonSin 0:0ed2a7c7190c 877 *
GordonSin 0:0ed2a7c7190c 878 * @param pcb the pcb for wich to set the recv callback
GordonSin 0:0ed2a7c7190c 879 * @param recv function pointer of the callback function
GordonSin 0:0ed2a7c7190c 880 * @param recv_arg additional argument to pass to the callback function
GordonSin 0:0ed2a7c7190c 881 */
GordonSin 0:0ed2a7c7190c 882 void
GordonSin 0:0ed2a7c7190c 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
GordonSin 0:0ed2a7c7190c 884 {
GordonSin 0:0ed2a7c7190c 885 /* remember recv() callback and user data */
GordonSin 0:0ed2a7c7190c 886 pcb->recv = recv;
GordonSin 0:0ed2a7c7190c 887 pcb->recv_arg = recv_arg;
GordonSin 0:0ed2a7c7190c 888 }
GordonSin 0:0ed2a7c7190c 889
GordonSin 0:0ed2a7c7190c 890 /**
GordonSin 0:0ed2a7c7190c 891 * Remove an UDP PCB.
GordonSin 0:0ed2a7c7190c 892 *
GordonSin 0:0ed2a7c7190c 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
GordonSin 0:0ed2a7c7190c 894 * UDP PCB's and the data structure is freed from memory.
GordonSin 0:0ed2a7c7190c 895 *
GordonSin 0:0ed2a7c7190c 896 * @see udp_new()
GordonSin 0:0ed2a7c7190c 897 */
GordonSin 0:0ed2a7c7190c 898 void
GordonSin 0:0ed2a7c7190c 899 udp_remove(struct udp_pcb *pcb)
GordonSin 0:0ed2a7c7190c 900 {
GordonSin 0:0ed2a7c7190c 901 struct udp_pcb *pcb2;
GordonSin 0:0ed2a7c7190c 902
GordonSin 0:0ed2a7c7190c 903 snmp_delete_udpidx_tree(pcb);
GordonSin 0:0ed2a7c7190c 904 /* pcb to be removed is first in list? */
GordonSin 0:0ed2a7c7190c 905 if (udp_pcbs == pcb) {
GordonSin 0:0ed2a7c7190c 906 /* make list start at 2nd pcb */
GordonSin 0:0ed2a7c7190c 907 udp_pcbs = udp_pcbs->next;
GordonSin 0:0ed2a7c7190c 908 /* pcb not 1st in list */
GordonSin 0:0ed2a7c7190c 909 } else {
GordonSin 0:0ed2a7c7190c 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
GordonSin 0:0ed2a7c7190c 911 /* find pcb in udp_pcbs list */
GordonSin 0:0ed2a7c7190c 912 if (pcb2->next != NULL && pcb2->next == pcb) {
GordonSin 0:0ed2a7c7190c 913 /* remove pcb from list */
GordonSin 0:0ed2a7c7190c 914 pcb2->next = pcb->next;
GordonSin 0:0ed2a7c7190c 915 }
GordonSin 0:0ed2a7c7190c 916 }
GordonSin 0:0ed2a7c7190c 917 }
GordonSin 0:0ed2a7c7190c 918 memp_free(MEMP_UDP_PCB, pcb);
GordonSin 0:0ed2a7c7190c 919 }
GordonSin 0:0ed2a7c7190c 920
GordonSin 0:0ed2a7c7190c 921 /**
GordonSin 0:0ed2a7c7190c 922 * Create a UDP PCB.
GordonSin 0:0ed2a7c7190c 923 *
GordonSin 0:0ed2a7c7190c 924 * @return The UDP PCB which was created. NULL if the PCB data structure
GordonSin 0:0ed2a7c7190c 925 * could not be allocated.
GordonSin 0:0ed2a7c7190c 926 *
GordonSin 0:0ed2a7c7190c 927 * @see udp_remove()
GordonSin 0:0ed2a7c7190c 928 */
GordonSin 0:0ed2a7c7190c 929 struct udp_pcb *
GordonSin 0:0ed2a7c7190c 930 udp_new(void)
GordonSin 0:0ed2a7c7190c 931 {
GordonSin 0:0ed2a7c7190c 932 struct udp_pcb *pcb;
GordonSin 0:0ed2a7c7190c 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
GordonSin 0:0ed2a7c7190c 934 /* could allocate UDP PCB? */
GordonSin 0:0ed2a7c7190c 935 if (pcb != NULL) {
GordonSin 0:0ed2a7c7190c 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
GordonSin 0:0ed2a7c7190c 937 * which means checksum is generated over the whole datagram per default
GordonSin 0:0ed2a7c7190c 938 * (recommended as default by RFC 3828). */
GordonSin 0:0ed2a7c7190c 939 /* initialize PCB to all zeroes */
GordonSin 0:0ed2a7c7190c 940 memset(pcb, 0, sizeof(struct udp_pcb));
GordonSin 0:0ed2a7c7190c 941 pcb->ttl = UDP_TTL;
GordonSin 0:0ed2a7c7190c 942 }
GordonSin 0:0ed2a7c7190c 943 return pcb;
GordonSin 0:0ed2a7c7190c 944 }
GordonSin 0:0ed2a7c7190c 945
GordonSin 0:0ed2a7c7190c 946 #if UDP_DEBUG
GordonSin 0:0ed2a7c7190c 947 /**
GordonSin 0:0ed2a7c7190c 948 * Print UDP header information for debug purposes.
GordonSin 0:0ed2a7c7190c 949 *
GordonSin 0:0ed2a7c7190c 950 * @param udphdr pointer to the udp header in memory.
GordonSin 0:0ed2a7c7190c 951 */
GordonSin 0:0ed2a7c7190c 952 void
GordonSin 0:0ed2a7c7190c 953 udp_debug_print(struct udp_hdr *udphdr)
GordonSin 0:0ed2a7c7190c 954 {
GordonSin 0:0ed2a7c7190c 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
GordonSin 0:0ed2a7c7190c 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
GordonSin 0:0ed2a7c7190c 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
GordonSin 0:0ed2a7c7190c 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
GordonSin 0:0ed2a7c7190c 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
GordonSin 0:0ed2a7c7190c 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 963 }
GordonSin 0:0ed2a7c7190c 964 #endif /* UDP_DEBUG */
GordonSin 0:0ed2a7c7190c 965
GordonSin 0:0ed2a7c7190c 966 #endif /* LWIP_UDP */