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Dependencies:   mbed

NetServices/lwip/core/udp.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * User Datagram Protocol module
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 */
Michael J. Spencer 1:f5ac63519541 6
Michael J. Spencer 1:f5ac63519541 7 /*
Michael J. Spencer 1:f5ac63519541 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 9 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 10 *
Michael J. Spencer 1:f5ac63519541 11 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 12 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 13 *
Michael J. Spencer 1:f5ac63519541 14 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 15 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 17 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 18 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 19 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 20 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 21 *
Michael J. Spencer 1:f5ac63519541 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 31 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 32 *
Michael J. Spencer 1:f5ac63519541 33 * This file is part of the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 34 *
Michael J. Spencer 1:f5ac63519541 35 * Author: Adam Dunkels <adam@sics.se>
Michael J. Spencer 1:f5ac63519541 36 *
Michael J. Spencer 1:f5ac63519541 37 */
Michael J. Spencer 1:f5ac63519541 38
Michael J. Spencer 1:f5ac63519541 39
Michael J. Spencer 1:f5ac63519541 40 /* udp.c
Michael J. Spencer 1:f5ac63519541 41 *
Michael J. Spencer 1:f5ac63519541 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
Michael J. Spencer 1:f5ac63519541 43 *
Michael J. Spencer 1:f5ac63519541 44 */
Michael J. Spencer 1:f5ac63519541 45
Michael J. Spencer 1:f5ac63519541 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
Michael J. Spencer 1:f5ac63519541 47 */
Michael J. Spencer 1:f5ac63519541 48
Michael J. Spencer 1:f5ac63519541 49 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 50
Michael J. Spencer 1:f5ac63519541 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
Michael J. Spencer 1:f5ac63519541 52
Michael J. Spencer 1:f5ac63519541 53 #include "lwip/udp.h"
Michael J. Spencer 1:f5ac63519541 54 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 55 #include "lwip/memp.h"
Michael J. Spencer 1:f5ac63519541 56 #include "lwip/inet_chksum.h"
Michael J. Spencer 1:f5ac63519541 57 #include "lwip/ip_addr.h"
Michael J. Spencer 1:f5ac63519541 58 #include "lwip/netif.h"
Michael J. Spencer 1:f5ac63519541 59 #include "lwip/icmp.h"
Michael J. Spencer 1:f5ac63519541 60 #include "lwip/stats.h"
Michael J. Spencer 1:f5ac63519541 61 #include "lwip/snmp.h"
Michael J. Spencer 1:f5ac63519541 62 #include "arch/perf.h"
Michael J. Spencer 1:f5ac63519541 63 #include "lwip/dhcp.h"
Michael J. Spencer 1:f5ac63519541 64
Michael J. Spencer 1:f5ac63519541 65 #include <string.h>
Michael J. Spencer 1:f5ac63519541 66
Michael J. Spencer 1:f5ac63519541 67 /* The list of UDP PCBs */
Michael J. Spencer 1:f5ac63519541 68 /* exported in udp.h (was static) */
Michael J. Spencer 1:f5ac63519541 69 struct udp_pcb *udp_pcbs;
Michael J. Spencer 1:f5ac63519541 70
Michael J. Spencer 1:f5ac63519541 71 /**
Michael J. Spencer 1:f5ac63519541 72 * Process an incoming UDP datagram.
Michael J. Spencer 1:f5ac63519541 73 *
Michael J. Spencer 1:f5ac63519541 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
Michael J. Spencer 1:f5ac63519541 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
Michael J. Spencer 1:f5ac63519541 76 * recv function. If no pcb is found or the datagram is incorrect, the
Michael J. Spencer 1:f5ac63519541 77 * pbuf is freed.
Michael J. Spencer 1:f5ac63519541 78 *
Michael J. Spencer 1:f5ac63519541 79 * @param p pbuf to be demultiplexed to a UDP PCB.
Michael J. Spencer 1:f5ac63519541 80 * @param inp network interface on which the datagram was received.
Michael J. Spencer 1:f5ac63519541 81 *
Michael J. Spencer 1:f5ac63519541 82 */
Michael J. Spencer 1:f5ac63519541 83 void
Michael J. Spencer 1:f5ac63519541 84 udp_input(struct pbuf *p, struct netif *inp)
Michael J. Spencer 1:f5ac63519541 85 {
Michael J. Spencer 1:f5ac63519541 86 struct udp_hdr *udphdr;
Michael J. Spencer 1:f5ac63519541 87 struct udp_pcb *pcb, *prev;
Michael J. Spencer 1:f5ac63519541 88 struct udp_pcb *uncon_pcb;
Michael J. Spencer 1:f5ac63519541 89 struct ip_hdr *iphdr;
Michael J. Spencer 1:f5ac63519541 90 u16_t src, dest;
Michael J. Spencer 1:f5ac63519541 91 u8_t local_match;
Michael J. Spencer 1:f5ac63519541 92 u8_t broadcast;
Michael J. Spencer 1:f5ac63519541 93
Michael J. Spencer 1:f5ac63519541 94 PERF_START;
Michael J. Spencer 1:f5ac63519541 95
Michael J. Spencer 1:f5ac63519541 96 UDP_STATS_INC(udp.recv);
Michael J. Spencer 1:f5ac63519541 97
Michael J. Spencer 1:f5ac63519541 98 iphdr = (struct ip_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 99
Michael J. Spencer 1:f5ac63519541 100 /* Check minimum length (IP header + UDP header)
Michael J. Spencer 1:f5ac63519541 101 * and move payload pointer to UDP header */
Michael J. Spencer 1:f5ac63519541 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
Michael J. Spencer 1:f5ac63519541 103 /* drop short packets */
Michael J. Spencer 1:f5ac63519541 104 LWIP_DEBUGF(UDP_DEBUG,
Michael J. Spencer 1:f5ac63519541 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
Michael J. Spencer 1:f5ac63519541 106 UDP_STATS_INC(udp.lenerr);
Michael J. Spencer 1:f5ac63519541 107 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 108 snmp_inc_udpinerrors();
Michael J. Spencer 1:f5ac63519541 109 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 110 goto end;
Michael J. Spencer 1:f5ac63519541 111 }
Michael J. Spencer 1:f5ac63519541 112
Michael J. Spencer 1:f5ac63519541 113 udphdr = (struct udp_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 114
Michael J. Spencer 1:f5ac63519541 115 /* is broadcast packet ? */
Michael J. Spencer 1:f5ac63519541 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
Michael J. Spencer 1:f5ac63519541 117
Michael J. Spencer 1:f5ac63519541 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
Michael J. Spencer 1:f5ac63519541 119
Michael J. Spencer 1:f5ac63519541 120 /* convert src and dest ports to host byte order */
Michael J. Spencer 1:f5ac63519541 121 src = ntohs(udphdr->src);
Michael J. Spencer 1:f5ac63519541 122 dest = ntohs(udphdr->dest);
Michael J. Spencer 1:f5ac63519541 123
Michael J. Spencer 1:f5ac63519541 124 udp_debug_print(udphdr);
Michael J. Spencer 1:f5ac63519541 125
Michael J. Spencer 1:f5ac63519541 126 /* print the UDP source and destination */
Michael J. Spencer 1:f5ac63519541 127 LWIP_DEBUGF(UDP_DEBUG,
Michael J. Spencer 1:f5ac63519541 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
Michael J. Spencer 1:f5ac63519541 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
Michael J. Spencer 1:f5ac63519541 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
Michael J. Spencer 1:f5ac63519541 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
Michael J. Spencer 1:f5ac63519541 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
Michael J. Spencer 1:f5ac63519541 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
Michael J. Spencer 1:f5ac63519541 134
Michael J. Spencer 1:f5ac63519541 135 #if LWIP_DHCP
Michael J. Spencer 1:f5ac63519541 136 pcb = NULL;
Michael J. Spencer 1:f5ac63519541 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
Michael J. Spencer 1:f5ac63519541 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
Michael J. Spencer 1:f5ac63519541 139 if (dest == DHCP_CLIENT_PORT) {
Michael J. Spencer 1:f5ac63519541 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
Michael J. Spencer 1:f5ac63519541 141 if (src == DHCP_SERVER_PORT) {
Michael J. Spencer 1:f5ac63519541 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
Michael J. Spencer 1:f5ac63519541 143 /* accept the packe if
Michael J. Spencer 1:f5ac63519541 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
Michael J. Spencer 1:f5ac63519541 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
Michael J. Spencer 1:f5ac63519541 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
Michael J. Spencer 1:f5ac63519541 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
Michael J. Spencer 1:f5ac63519541 148 pcb = inp->dhcp->pcb;
Michael J. Spencer 1:f5ac63519541 149 }
Michael J. Spencer 1:f5ac63519541 150 }
Michael J. Spencer 1:f5ac63519541 151 }
Michael J. Spencer 1:f5ac63519541 152 } else
Michael J. Spencer 1:f5ac63519541 153 #endif /* LWIP_DHCP */
Michael J. Spencer 1:f5ac63519541 154 {
Michael J. Spencer 1:f5ac63519541 155 prev = NULL;
Michael J. Spencer 1:f5ac63519541 156 local_match = 0;
Michael J. Spencer 1:f5ac63519541 157 uncon_pcb = NULL;
Michael J. Spencer 1:f5ac63519541 158 /* Iterate through the UDP pcb list for a matching pcb.
Michael J. Spencer 1:f5ac63519541 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
Michael J. Spencer 1:f5ac63519541 160 * preferred. If no perfect match is found, the first unconnected pcb that
Michael J. Spencer 1:f5ac63519541 161 * matches the local port and ip address gets the datagram. */
Michael J. Spencer 1:f5ac63519541 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
Michael J. Spencer 1:f5ac63519541 163 local_match = 0;
Michael J. Spencer 1:f5ac63519541 164 /* print the PCB local and remote address */
Michael J. Spencer 1:f5ac63519541 165 LWIP_DEBUGF(UDP_DEBUG,
Michael J. Spencer 1:f5ac63519541 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
Michael J. Spencer 1:f5ac63519541 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
Michael J. Spencer 1:f5ac63519541 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Michael J. Spencer 1:f5ac63519541 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
Michael J. Spencer 1:f5ac63519541 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
Michael J. Spencer 1:f5ac63519541 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
Michael J. Spencer 1:f5ac63519541 172
Michael J. Spencer 1:f5ac63519541 173 /* compare PCB local addr+port to UDP destination addr+port */
Michael J. Spencer 1:f5ac63519541 174 if ((pcb->local_port == dest) &&
Michael J. Spencer 1:f5ac63519541 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
Michael J. Spencer 1:f5ac63519541 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
Michael J. Spencer 1:f5ac63519541 177 #if LWIP_IGMP
Michael J. Spencer 1:f5ac63519541 178 ip_addr_ismulticast(&current_iphdr_dest) ||
Michael J. Spencer 1:f5ac63519541 179 #endif /* LWIP_IGMP */
Michael J. Spencer 1:f5ac63519541 180 #if IP_SOF_BROADCAST_RECV
Michael J. Spencer 1:f5ac63519541 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
Michael J. Spencer 1:f5ac63519541 182 #else /* IP_SOF_BROADCAST_RECV */
Michael J. Spencer 1:f5ac63519541 183 (broadcast))) {
Michael J. Spencer 1:f5ac63519541 184 #endif /* IP_SOF_BROADCAST_RECV */
Michael J. Spencer 1:f5ac63519541 185 local_match = 1;
Michael J. Spencer 1:f5ac63519541 186 if ((uncon_pcb == NULL) &&
Michael J. Spencer 1:f5ac63519541 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
Michael J. Spencer 1:f5ac63519541 188 /* the first unconnected matching PCB */
Michael J. Spencer 1:f5ac63519541 189 uncon_pcb = pcb;
Michael J. Spencer 1:f5ac63519541 190 }
Michael J. Spencer 1:f5ac63519541 191 }
Michael J. Spencer 1:f5ac63519541 192 /* compare PCB remote addr+port to UDP source addr+port */
Michael J. Spencer 1:f5ac63519541 193 if ((local_match != 0) &&
Michael J. Spencer 1:f5ac63519541 194 (pcb->remote_port == src) &&
Michael J. Spencer 1:f5ac63519541 195 (ip_addr_isany(&pcb->remote_ip) ||
Michael J. Spencer 1:f5ac63519541 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
Michael J. Spencer 1:f5ac63519541 197 /* the first fully matching PCB */
Michael J. Spencer 1:f5ac63519541 198 if (prev != NULL) {
Michael J. Spencer 1:f5ac63519541 199 /* move the pcb to the front of udp_pcbs so that is
Michael J. Spencer 1:f5ac63519541 200 found faster next time */
Michael J. Spencer 1:f5ac63519541 201 prev->next = pcb->next;
Michael J. Spencer 1:f5ac63519541 202 pcb->next = udp_pcbs;
Michael J. Spencer 1:f5ac63519541 203 udp_pcbs = pcb;
Michael J. Spencer 1:f5ac63519541 204 } else {
Michael J. Spencer 1:f5ac63519541 205 UDP_STATS_INC(udp.cachehit);
Michael J. Spencer 1:f5ac63519541 206 }
Michael J. Spencer 1:f5ac63519541 207 break;
Michael J. Spencer 1:f5ac63519541 208 }
Michael J. Spencer 1:f5ac63519541 209 prev = pcb;
Michael J. Spencer 1:f5ac63519541 210 }
Michael J. Spencer 1:f5ac63519541 211 /* no fully matching pcb found? then look for an unconnected pcb */
Michael J. Spencer 1:f5ac63519541 212 if (pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 213 pcb = uncon_pcb;
Michael J. Spencer 1:f5ac63519541 214 }
Michael J. Spencer 1:f5ac63519541 215 }
Michael J. Spencer 1:f5ac63519541 216
Michael J. Spencer 1:f5ac63519541 217 /* Check checksum if this is a match or if it was directed at us. */
Michael J. Spencer 1:f5ac63519541 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
Michael J. Spencer 1:f5ac63519541 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
Michael J. Spencer 1:f5ac63519541 220 #if LWIP_UDPLITE
Michael J. Spencer 1:f5ac63519541 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
Michael J. Spencer 1:f5ac63519541 222 /* Do the UDP Lite checksum */
Michael J. Spencer 1:f5ac63519541 223 #if CHECKSUM_CHECK_UDP
Michael J. Spencer 1:f5ac63519541 224 u16_t chklen = ntohs(udphdr->len);
Michael J. Spencer 1:f5ac63519541 225 if (chklen < sizeof(struct udp_hdr)) {
Michael J. Spencer 1:f5ac63519541 226 if (chklen == 0) {
Michael J. Spencer 1:f5ac63519541 227 /* For UDP-Lite, checksum length of 0 means checksum
Michael J. Spencer 1:f5ac63519541 228 over the complete packet (See RFC 3828 chap. 3.1) */
Michael J. Spencer 1:f5ac63519541 229 chklen = p->tot_len;
Michael J. Spencer 1:f5ac63519541 230 } else {
Michael J. Spencer 1:f5ac63519541 231 /* At least the UDP-Lite header must be covered by the
Michael J. Spencer 1:f5ac63519541 232 checksum! (Again, see RFC 3828 chap. 3.1) */
Michael J. Spencer 1:f5ac63519541 233 UDP_STATS_INC(udp.chkerr);
Michael J. Spencer 1:f5ac63519541 234 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 235 snmp_inc_udpinerrors();
Michael J. Spencer 1:f5ac63519541 236 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 237 goto end;
Michael J. Spencer 1:f5ac63519541 238 }
Michael J. Spencer 1:f5ac63519541 239 }
Michael J. Spencer 1:f5ac63519541 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
Michael J. Spencer 1:f5ac63519541 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
Michael J. Spencer 1:f5ac63519541 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
Michael J. Spencer 1:f5ac63519541 244 UDP_STATS_INC(udp.chkerr);
Michael J. Spencer 1:f5ac63519541 245 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 246 snmp_inc_udpinerrors();
Michael J. Spencer 1:f5ac63519541 247 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 248 goto end;
Michael J. Spencer 1:f5ac63519541 249 }
Michael J. Spencer 1:f5ac63519541 250 #endif /* CHECKSUM_CHECK_UDP */
Michael J. Spencer 1:f5ac63519541 251 } else
Michael J. Spencer 1:f5ac63519541 252 #endif /* LWIP_UDPLITE */
Michael J. Spencer 1:f5ac63519541 253 {
Michael J. Spencer 1:f5ac63519541 254 #if CHECKSUM_CHECK_UDP
Michael J. Spencer 1:f5ac63519541 255 if (udphdr->chksum != 0) {
Michael J. Spencer 1:f5ac63519541 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
Michael J. Spencer 1:f5ac63519541 257 IP_PROTO_UDP, p->tot_len) != 0) {
Michael J. Spencer 1:f5ac63519541 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
Michael J. Spencer 1:f5ac63519541 260 UDP_STATS_INC(udp.chkerr);
Michael J. Spencer 1:f5ac63519541 261 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 262 snmp_inc_udpinerrors();
Michael J. Spencer 1:f5ac63519541 263 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 264 goto end;
Michael J. Spencer 1:f5ac63519541 265 }
Michael J. Spencer 1:f5ac63519541 266 }
Michael J. Spencer 1:f5ac63519541 267 #endif /* CHECKSUM_CHECK_UDP */
Michael J. Spencer 1:f5ac63519541 268 }
Michael J. Spencer 1:f5ac63519541 269 if(pbuf_header(p, -UDP_HLEN)) {
Michael J. Spencer 1:f5ac63519541 270 /* Can we cope with this failing? Just assert for now */
Michael J. Spencer 1:f5ac63519541 271 LWIP_ASSERT("pbuf_header failed\n", 0);
Michael J. Spencer 1:f5ac63519541 272 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 273 snmp_inc_udpinerrors();
Michael J. Spencer 1:f5ac63519541 274 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 275 goto end;
Michael J. Spencer 1:f5ac63519541 276 }
Michael J. Spencer 1:f5ac63519541 277 if (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 278 snmp_inc_udpindatagrams();
Michael J. Spencer 1:f5ac63519541 279 #if SO_REUSE && SO_REUSE_RXTOALL
Michael J. Spencer 1:f5ac63519541 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
Michael J. Spencer 1:f5ac63519541 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
Michael J. Spencer 1:f5ac63519541 282 /* pass broadcast- or multicast packets to all multicast pcbs
Michael J. Spencer 1:f5ac63519541 283 if SOF_REUSEADDR is set on the first match */
Michael J. Spencer 1:f5ac63519541 284 struct udp_pcb *mpcb;
Michael J. Spencer 1:f5ac63519541 285 u8_t p_header_changed = 0;
Michael J. Spencer 1:f5ac63519541 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
Michael J. Spencer 1:f5ac63519541 287 if (mpcb != pcb) {
Michael J. Spencer 1:f5ac63519541 288 /* compare PCB local addr+port to UDP destination addr+port */
Michael J. Spencer 1:f5ac63519541 289 if ((mpcb->local_port == dest) &&
Michael J. Spencer 1:f5ac63519541 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
Michael J. Spencer 1:f5ac63519541 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
Michael J. Spencer 1:f5ac63519541 292 #if LWIP_IGMP
Michael J. Spencer 1:f5ac63519541 293 ip_addr_ismulticast(&current_iphdr_dest) ||
Michael J. Spencer 1:f5ac63519541 294 #endif /* LWIP_IGMP */
Michael J. Spencer 1:f5ac63519541 295 #if IP_SOF_BROADCAST_RECV
Michael J. Spencer 1:f5ac63519541 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
Michael J. Spencer 1:f5ac63519541 297 #else /* IP_SOF_BROADCAST_RECV */
Michael J. Spencer 1:f5ac63519541 298 (broadcast))) {
Michael J. Spencer 1:f5ac63519541 299 #endif /* IP_SOF_BROADCAST_RECV */
Michael J. Spencer 1:f5ac63519541 300 /* pass a copy of the packet to all local matches */
Michael J. Spencer 1:f5ac63519541 301 if (mpcb->recv != NULL) {
Michael J. Spencer 1:f5ac63519541 302 struct pbuf *q;
Michael J. Spencer 1:f5ac63519541 303 /* for that, move payload to IP header again */
Michael J. Spencer 1:f5ac63519541 304 if (p_header_changed == 0) {
Michael J. Spencer 1:f5ac63519541 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Michael J. Spencer 1:f5ac63519541 306 p_header_changed = 1;
Michael J. Spencer 1:f5ac63519541 307 }
Michael J. Spencer 1:f5ac63519541 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
Michael J. Spencer 1:f5ac63519541 309 if (q != NULL) {
Michael J. Spencer 1:f5ac63519541 310 err_t err = pbuf_copy(q, p);
Michael J. Spencer 1:f5ac63519541 311 if (err == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 312 /* move payload to UDP data */
Michael J. Spencer 1:f5ac63519541 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Michael J. Spencer 1:f5ac63519541 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
Michael J. Spencer 1:f5ac63519541 315 }
Michael J. Spencer 1:f5ac63519541 316 }
Michael J. Spencer 1:f5ac63519541 317 }
Michael J. Spencer 1:f5ac63519541 318 }
Michael J. Spencer 1:f5ac63519541 319 }
Michael J. Spencer 1:f5ac63519541 320 }
Michael J. Spencer 1:f5ac63519541 321 if (p_header_changed) {
Michael J. Spencer 1:f5ac63519541 322 /* and move payload to UDP data again */
Michael J. Spencer 1:f5ac63519541 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Michael J. Spencer 1:f5ac63519541 324 }
Michael J. Spencer 1:f5ac63519541 325 }
Michael J. Spencer 1:f5ac63519541 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
Michael J. Spencer 1:f5ac63519541 327 /* callback */
Michael J. Spencer 1:f5ac63519541 328 if (pcb->recv != NULL) {
Michael J. Spencer 1:f5ac63519541 329 /* now the recv function is responsible for freeing p */
Michael J. Spencer 1:f5ac63519541 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
Michael J. Spencer 1:f5ac63519541 331 } else {
Michael J. Spencer 1:f5ac63519541 332 /* no recv function registered? then we have to free the pbuf! */
Michael J. Spencer 1:f5ac63519541 333 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 334 goto end;
Michael J. Spencer 1:f5ac63519541 335 }
Michael J. Spencer 1:f5ac63519541 336 } else {
Michael J. Spencer 1:f5ac63519541 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
Michael J. Spencer 1:f5ac63519541 338
Michael J. Spencer 1:f5ac63519541 339 #if LWIP_ICMP
Michael J. Spencer 1:f5ac63519541 340 /* No match was found, send ICMP destination port unreachable unless
Michael J. Spencer 1:f5ac63519541 341 destination address was broadcast/multicast. */
Michael J. Spencer 1:f5ac63519541 342 if (!broadcast &&
Michael J. Spencer 1:f5ac63519541 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
Michael J. Spencer 1:f5ac63519541 344 /* move payload pointer back to ip header */
Michael J. Spencer 1:f5ac63519541 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
Michael J. Spencer 1:f5ac63519541 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
Michael J. Spencer 1:f5ac63519541 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
Michael J. Spencer 1:f5ac63519541 348 }
Michael J. Spencer 1:f5ac63519541 349 #endif /* LWIP_ICMP */
Michael J. Spencer 1:f5ac63519541 350 UDP_STATS_INC(udp.proterr);
Michael J. Spencer 1:f5ac63519541 351 UDP_STATS_INC(udp.drop);
Michael J. Spencer 1:f5ac63519541 352 snmp_inc_udpnoports();
Michael J. Spencer 1:f5ac63519541 353 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 354 }
Michael J. Spencer 1:f5ac63519541 355 } else {
Michael J. Spencer 1:f5ac63519541 356 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 357 }
Michael J. Spencer 1:f5ac63519541 358 end:
Michael J. Spencer 1:f5ac63519541 359 PERF_STOP("udp_input");
Michael J. Spencer 1:f5ac63519541 360 }
Michael J. Spencer 1:f5ac63519541 361
Michael J. Spencer 1:f5ac63519541 362 /**
Michael J. Spencer 1:f5ac63519541 363 * Send data using UDP.
Michael J. Spencer 1:f5ac63519541 364 *
Michael J. Spencer 1:f5ac63519541 365 * @param pcb UDP PCB used to send the data.
Michael J. Spencer 1:f5ac63519541 366 * @param p chain of pbuf's to be sent.
Michael J. Spencer 1:f5ac63519541 367 *
Michael J. Spencer 1:f5ac63519541 368 * The datagram will be sent to the current remote_ip & remote_port
Michael J. Spencer 1:f5ac63519541 369 * stored in pcb. If the pcb is not bound to a port, it will
Michael J. Spencer 1:f5ac63519541 370 * automatically be bound to a random port.
Michael J. Spencer 1:f5ac63519541 371 *
Michael J. Spencer 1:f5ac63519541 372 * @return lwIP error code.
Michael J. Spencer 1:f5ac63519541 373 * - ERR_OK. Successful. No error occured.
Michael J. Spencer 1:f5ac63519541 374 * - ERR_MEM. Out of memory.
Michael J. Spencer 1:f5ac63519541 375 * - ERR_RTE. Could not find route to destination address.
Michael J. Spencer 1:f5ac63519541 376 * - More errors could be returned by lower protocol layers.
Michael J. Spencer 1:f5ac63519541 377 *
Michael J. Spencer 1:f5ac63519541 378 * @see udp_disconnect() udp_sendto()
Michael J. Spencer 1:f5ac63519541 379 */
Michael J. Spencer 1:f5ac63519541 380 err_t
Michael J. Spencer 1:f5ac63519541 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
Michael J. Spencer 1:f5ac63519541 382 {
Michael J. Spencer 1:f5ac63519541 383 /* send to the packet using remote ip and port stored in the pcb */
Michael J. Spencer 1:f5ac63519541 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
Michael J. Spencer 1:f5ac63519541 385 }
Michael J. Spencer 1:f5ac63519541 386
Michael J. Spencer 1:f5ac63519541 387 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 388 /** Same as udp_send() but with checksum
Michael J. Spencer 1:f5ac63519541 389 */
Michael J. Spencer 1:f5ac63519541 390 err_t
Michael J. Spencer 1:f5ac63519541 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
Michael J. Spencer 1:f5ac63519541 392 u8_t have_chksum, u16_t chksum)
Michael J. Spencer 1:f5ac63519541 393 {
Michael J. Spencer 1:f5ac63519541 394 /* send to the packet using remote ip and port stored in the pcb */
Michael J. Spencer 1:f5ac63519541 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
Michael J. Spencer 1:f5ac63519541 396 have_chksum, chksum);
Michael J. Spencer 1:f5ac63519541 397 }
Michael J. Spencer 1:f5ac63519541 398 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 399
Michael J. Spencer 1:f5ac63519541 400 /**
Michael J. Spencer 1:f5ac63519541 401 * Send data to a specified address using UDP.
Michael J. Spencer 1:f5ac63519541 402 *
Michael J. Spencer 1:f5ac63519541 403 * @param pcb UDP PCB used to send the data.
Michael J. Spencer 1:f5ac63519541 404 * @param p chain of pbuf's to be sent.
Michael J. Spencer 1:f5ac63519541 405 * @param dst_ip Destination IP address.
Michael J. Spencer 1:f5ac63519541 406 * @param dst_port Destination UDP port.
Michael J. Spencer 1:f5ac63519541 407 *
Michael J. Spencer 1:f5ac63519541 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
Michael J. Spencer 1:f5ac63519541 409 *
Michael J. Spencer 1:f5ac63519541 410 * If the PCB already has a remote address association, it will
Michael J. Spencer 1:f5ac63519541 411 * be restored after the data is sent.
Michael J. Spencer 1:f5ac63519541 412 *
Michael J. Spencer 1:f5ac63519541 413 * @return lwIP error code (@see udp_send for possible error codes)
Michael J. Spencer 1:f5ac63519541 414 *
Michael J. Spencer 1:f5ac63519541 415 * @see udp_disconnect() udp_send()
Michael J. Spencer 1:f5ac63519541 416 */
Michael J. Spencer 1:f5ac63519541 417 err_t
Michael J. Spencer 1:f5ac63519541 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
Michael J. Spencer 1:f5ac63519541 419 ip_addr_t *dst_ip, u16_t dst_port)
Michael J. Spencer 1:f5ac63519541 420 {
Michael J. Spencer 1:f5ac63519541 421 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
Michael J. Spencer 1:f5ac63519541 423 }
Michael J. Spencer 1:f5ac63519541 424
Michael J. Spencer 1:f5ac63519541 425 /** Same as udp_sendto(), but with checksum */
Michael J. Spencer 1:f5ac63519541 426 err_t
Michael J. Spencer 1:f5ac63519541 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
Michael J. Spencer 1:f5ac63519541 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
Michael J. Spencer 1:f5ac63519541 429 {
Michael J. Spencer 1:f5ac63519541 430 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 431 struct netif *netif;
Michael J. Spencer 1:f5ac63519541 432
Michael J. Spencer 1:f5ac63519541 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
Michael J. Spencer 1:f5ac63519541 434
Michael J. Spencer 1:f5ac63519541 435 /* find the outgoing network interface for this packet */
Michael J. Spencer 1:f5ac63519541 436 #if LWIP_IGMP
Michael J. Spencer 1:f5ac63519541 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
Michael J. Spencer 1:f5ac63519541 438 #else
Michael J. Spencer 1:f5ac63519541 439 netif = ip_route(dst_ip);
Michael J. Spencer 1:f5ac63519541 440 #endif /* LWIP_IGMP */
Michael J. Spencer 1:f5ac63519541 441
Michael J. Spencer 1:f5ac63519541 442 /* no outgoing network interface could be found? */
Michael J. Spencer 1:f5ac63519541 443 if (netif == NULL) {
Michael J. Spencer 1:f5ac63519541 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
Michael J. Spencer 1:f5ac63519541 446 UDP_STATS_INC(udp.rterr);
Michael J. Spencer 1:f5ac63519541 447 return ERR_RTE;
Michael J. Spencer 1:f5ac63519541 448 }
Michael J. Spencer 1:f5ac63519541 449 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
Michael J. Spencer 1:f5ac63519541 451 #else /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
Michael J. Spencer 1:f5ac63519541 453 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 454 }
Michael J. Spencer 1:f5ac63519541 455
Michael J. Spencer 1:f5ac63519541 456 /**
Michael J. Spencer 1:f5ac63519541 457 * Send data to a specified address using UDP.
Michael J. Spencer 1:f5ac63519541 458 * The netif used for sending can be specified.
Michael J. Spencer 1:f5ac63519541 459 *
Michael J. Spencer 1:f5ac63519541 460 * This function exists mainly for DHCP, to be able to send UDP packets
Michael J. Spencer 1:f5ac63519541 461 * on a netif that is still down.
Michael J. Spencer 1:f5ac63519541 462 *
Michael J. Spencer 1:f5ac63519541 463 * @param pcb UDP PCB used to send the data.
Michael J. Spencer 1:f5ac63519541 464 * @param p chain of pbuf's to be sent.
Michael J. Spencer 1:f5ac63519541 465 * @param dst_ip Destination IP address.
Michael J. Spencer 1:f5ac63519541 466 * @param dst_port Destination UDP port.
Michael J. Spencer 1:f5ac63519541 467 * @param netif the netif used for sending.
Michael J. Spencer 1:f5ac63519541 468 *
Michael J. Spencer 1:f5ac63519541 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
Michael J. Spencer 1:f5ac63519541 470 *
Michael J. Spencer 1:f5ac63519541 471 * @return lwIP error code (@see udp_send for possible error codes)
Michael J. Spencer 1:f5ac63519541 472 *
Michael J. Spencer 1:f5ac63519541 473 * @see udp_disconnect() udp_send()
Michael J. Spencer 1:f5ac63519541 474 */
Michael J. Spencer 1:f5ac63519541 475 err_t
Michael J. Spencer 1:f5ac63519541 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
Michael J. Spencer 1:f5ac63519541 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
Michael J. Spencer 1:f5ac63519541 478 {
Michael J. Spencer 1:f5ac63519541 479 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
Michael J. Spencer 1:f5ac63519541 481 }
Michael J. Spencer 1:f5ac63519541 482
Michael J. Spencer 1:f5ac63519541 483 /** Same as udp_sendto_if(), but with checksum */
Michael J. Spencer 1:f5ac63519541 484 err_t
Michael J. Spencer 1:f5ac63519541 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
Michael J. Spencer 1:f5ac63519541 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
Michael J. Spencer 1:f5ac63519541 487 u16_t chksum)
Michael J. Spencer 1:f5ac63519541 488 {
Michael J. Spencer 1:f5ac63519541 489 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 490 struct udp_hdr *udphdr;
Michael J. Spencer 1:f5ac63519541 491 ip_addr_t *src_ip;
Michael J. Spencer 1:f5ac63519541 492 err_t err;
Michael J. Spencer 1:f5ac63519541 493 struct pbuf *q; /* q will be sent down the stack */
Michael J. Spencer 1:f5ac63519541 494
Michael J. Spencer 1:f5ac63519541 495 #if IP_SOF_BROADCAST
Michael J. Spencer 1:f5ac63519541 496 /* broadcast filter? */
Michael J. Spencer 1:f5ac63519541 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
Michael J. Spencer 1:f5ac63519541 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
Michael J. Spencer 1:f5ac63519541 500 return ERR_VAL;
Michael J. Spencer 1:f5ac63519541 501 }
Michael J. Spencer 1:f5ac63519541 502 #endif /* IP_SOF_BROADCAST */
Michael J. Spencer 1:f5ac63519541 503
Michael J. Spencer 1:f5ac63519541 504 /* if the PCB is not yet bound to a port, bind it here */
Michael J. Spencer 1:f5ac63519541 505 if (pcb->local_port == 0) {
Michael J. Spencer 1:f5ac63519541 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
Michael J. Spencer 1:f5ac63519541 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
Michael J. Spencer 1:f5ac63519541 508 if (err != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
Michael J. Spencer 1:f5ac63519541 510 return err;
Michael J. Spencer 1:f5ac63519541 511 }
Michael J. Spencer 1:f5ac63519541 512 }
Michael J. Spencer 1:f5ac63519541 513
Michael J. Spencer 1:f5ac63519541 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
Michael J. Spencer 1:f5ac63519541 515 if (pbuf_header(p, UDP_HLEN)) {
Michael J. Spencer 1:f5ac63519541 516 /* allocate header in a separate new pbuf */
Michael J. Spencer 1:f5ac63519541 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
Michael J. Spencer 1:f5ac63519541 518 /* new header pbuf could not be allocated? */
Michael J. Spencer 1:f5ac63519541 519 if (q == NULL) {
Michael J. Spencer 1:f5ac63519541 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
Michael J. Spencer 1:f5ac63519541 521 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 522 }
Michael J. Spencer 1:f5ac63519541 523 /* chain header q in front of given pbuf p */
Michael J. Spencer 1:f5ac63519541 524 pbuf_chain(q, p);
Michael J. Spencer 1:f5ac63519541 525 /* first pbuf q points to header pbuf */
Michael J. Spencer 1:f5ac63519541 526 LWIP_DEBUGF(UDP_DEBUG,
Michael J. Spencer 1:f5ac63519541 527 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
Michael J. Spencer 1:f5ac63519541 528 } else {
Michael J. Spencer 1:f5ac63519541 529 /* adding space for header within p succeeded */
Michael J. Spencer 1:f5ac63519541 530 /* first pbuf q equals given pbuf */
Michael J. Spencer 1:f5ac63519541 531 q = p;
Michael J. Spencer 1:f5ac63519541 532 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
Michael J. Spencer 1:f5ac63519541 533 }
Michael J. Spencer 1:f5ac63519541 534 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
Michael J. Spencer 1:f5ac63519541 535 (q->len >= sizeof(struct udp_hdr)));
Michael J. Spencer 1:f5ac63519541 536 /* q now represents the packet to be sent */
Michael J. Spencer 1:f5ac63519541 537 udphdr = (struct udp_hdr *)q->payload;
Michael J. Spencer 1:f5ac63519541 538 udphdr->src = htons(pcb->local_port);
Michael J. Spencer 1:f5ac63519541 539 udphdr->dest = htons(dst_port);
Michael J. Spencer 1:f5ac63519541 540 /* in UDP, 0 checksum means 'no checksum' */
Michael J. Spencer 1:f5ac63519541 541 udphdr->chksum = 0x0000;
Michael J. Spencer 1:f5ac63519541 542
Michael J. Spencer 1:f5ac63519541 543 /* Multicast Loop? */
Michael J. Spencer 1:f5ac63519541 544 #if LWIP_IGMP
Michael J. Spencer 1:f5ac63519541 545 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
Michael J. Spencer 1:f5ac63519541 546 q->flags |= PBUF_FLAG_MCASTLOOP;
Michael J. Spencer 1:f5ac63519541 547 }
Michael J. Spencer 1:f5ac63519541 548 #endif /* LWIP_IGMP */
Michael J. Spencer 1:f5ac63519541 549
Michael J. Spencer 1:f5ac63519541 550
Michael J. Spencer 1:f5ac63519541 551 /* PCB local address is IP_ANY_ADDR? */
Michael J. Spencer 1:f5ac63519541 552 if (ip_addr_isany(&pcb->local_ip)) {
Michael J. Spencer 1:f5ac63519541 553 /* use outgoing network interface IP address as source address */
Michael J. Spencer 1:f5ac63519541 554 src_ip = &(netif->ip_addr);
Michael J. Spencer 1:f5ac63519541 555 } else {
Michael J. Spencer 1:f5ac63519541 556 /* check if UDP PCB local IP address is correct
Michael J. Spencer 1:f5ac63519541 557 * this could be an old address if netif->ip_addr has changed */
Michael J. Spencer 1:f5ac63519541 558 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
Michael J. Spencer 1:f5ac63519541 559 /* local_ip doesn't match, drop the packet */
Michael J. Spencer 1:f5ac63519541 560 if (q != p) {
Michael J. Spencer 1:f5ac63519541 561 /* free the header pbuf */
Michael J. Spencer 1:f5ac63519541 562 pbuf_free(q);
Michael J. Spencer 1:f5ac63519541 563 q = NULL;
Michael J. Spencer 1:f5ac63519541 564 /* p is still referenced by the caller, and will live on */
Michael J. Spencer 1:f5ac63519541 565 }
Michael J. Spencer 1:f5ac63519541 566 return ERR_VAL;
Michael J. Spencer 1:f5ac63519541 567 }
Michael J. Spencer 1:f5ac63519541 568 /* use UDP PCB local IP address as source address */
Michael J. Spencer 1:f5ac63519541 569 src_ip = &(pcb->local_ip);
Michael J. Spencer 1:f5ac63519541 570 }
Michael J. Spencer 1:f5ac63519541 571
Michael J. Spencer 1:f5ac63519541 572 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
Michael J. Spencer 1:f5ac63519541 573
Michael J. Spencer 1:f5ac63519541 574 #if LWIP_UDPLITE
Michael J. Spencer 1:f5ac63519541 575 /* UDP Lite protocol? */
Michael J. Spencer 1:f5ac63519541 576 if (pcb->flags & UDP_FLAGS_UDPLITE) {
Michael J. Spencer 1:f5ac63519541 577 u16_t chklen, chklen_hdr;
Michael J. Spencer 1:f5ac63519541 578 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
Michael J. Spencer 1:f5ac63519541 579 /* set UDP message length in UDP header */
Michael J. Spencer 1:f5ac63519541 580 chklen_hdr = chklen = pcb->chksum_len_tx;
Michael J. Spencer 1:f5ac63519541 581 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
Michael J. Spencer 1:f5ac63519541 582 if (chklen != 0) {
Michael J. Spencer 1:f5ac63519541 583 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
Michael J. Spencer 1:f5ac63519541 584 }
Michael J. Spencer 1:f5ac63519541 585 /* For UDP-Lite, checksum length of 0 means checksum
Michael J. Spencer 1:f5ac63519541 586 over the complete packet. (See RFC 3828 chap. 3.1)
Michael J. Spencer 1:f5ac63519541 587 At least the UDP-Lite header must be covered by the
Michael J. Spencer 1:f5ac63519541 588 checksum, therefore, if chksum_len has an illegal
Michael J. Spencer 1:f5ac63519541 589 value, we generate the checksum over the complete
Michael J. Spencer 1:f5ac63519541 590 packet to be safe. */
Michael J. Spencer 1:f5ac63519541 591 chklen_hdr = 0;
Michael J. Spencer 1:f5ac63519541 592 chklen = q->tot_len;
Michael J. Spencer 1:f5ac63519541 593 }
Michael J. Spencer 1:f5ac63519541 594 udphdr->len = htons(chklen_hdr);
Michael J. Spencer 1:f5ac63519541 595 /* calculate checksum */
Michael J. Spencer 1:f5ac63519541 596 #if CHECKSUM_GEN_UDP
Michael J. Spencer 1:f5ac63519541 597 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
Michael J. Spencer 1:f5ac63519541 598 IP_PROTO_UDPLITE, q->tot_len,
Michael J. Spencer 1:f5ac63519541 599 #if !LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 600 chklen);
Michael J. Spencer 1:f5ac63519541 601 #else /* !LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 602 (have_chksum ? UDP_HLEN : chklen));
Michael J. Spencer 1:f5ac63519541 603 if (have_chksum) {
Michael J. Spencer 1:f5ac63519541 604 u32_t acc;
Michael J. Spencer 1:f5ac63519541 605 acc = udphdr->chksum + (u16_t)~(chksum);
Michael J. Spencer 1:f5ac63519541 606 udphdr->chksum = FOLD_U32T(acc);
Michael J. Spencer 1:f5ac63519541 607 }
Michael J. Spencer 1:f5ac63519541 608 #endif /* !LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 609
Michael J. Spencer 1:f5ac63519541 610 /* chksum zero must become 0xffff, as zero means 'no checksum' */
Michael J. Spencer 1:f5ac63519541 611 if (udphdr->chksum == 0x0000) {
Michael J. Spencer 1:f5ac63519541 612 udphdr->chksum = 0xffff;
Michael J. Spencer 1:f5ac63519541 613 }
Michael J. Spencer 1:f5ac63519541 614 #endif /* CHECKSUM_GEN_UDP */
Michael J. Spencer 1:f5ac63519541 615 /* output to IP */
Michael J. Spencer 1:f5ac63519541 616 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
Michael J. Spencer 1:f5ac63519541 617 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 618 netif->addr_hint = &(pcb->addr_hint);
Michael J. Spencer 1:f5ac63519541 619 #endif /* LWIP_NETIF_HWADDRHINT*/
Michael J. Spencer 1:f5ac63519541 620 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
Michael J. Spencer 1:f5ac63519541 621 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 622 netif->addr_hint = NULL;
Michael J. Spencer 1:f5ac63519541 623 #endif /* LWIP_NETIF_HWADDRHINT*/
Michael J. Spencer 1:f5ac63519541 624 } else
Michael J. Spencer 1:f5ac63519541 625 #endif /* LWIP_UDPLITE */
Michael J. Spencer 1:f5ac63519541 626 { /* UDP */
Michael J. Spencer 1:f5ac63519541 627 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
Michael J. Spencer 1:f5ac63519541 628 udphdr->len = htons(q->tot_len);
Michael J. Spencer 1:f5ac63519541 629 /* calculate checksum */
Michael J. Spencer 1:f5ac63519541 630 #if CHECKSUM_GEN_UDP
Michael J. Spencer 1:f5ac63519541 631 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
Michael J. Spencer 1:f5ac63519541 632 u16_t udpchksum;
Michael J. Spencer 1:f5ac63519541 633 #if LWIP_CHECKSUM_ON_COPY
Michael J. Spencer 1:f5ac63519541 634 if (have_chksum) {
Michael J. Spencer 1:f5ac63519541 635 u32_t acc;
Michael J. Spencer 1:f5ac63519541 636 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
Michael J. Spencer 1:f5ac63519541 637 q->tot_len, UDP_HLEN);
Michael J. Spencer 1:f5ac63519541 638 acc = udpchksum + (u16_t)~(chksum);
Michael J. Spencer 1:f5ac63519541 639 udpchksum = FOLD_U32T(acc);
Michael J. Spencer 1:f5ac63519541 640 } else
Michael J. Spencer 1:f5ac63519541 641 #endif /* LWIP_CHECKSUM_ON_COPY */
Michael J. Spencer 1:f5ac63519541 642 {
Michael J. Spencer 1:f5ac63519541 643 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
Michael J. Spencer 1:f5ac63519541 644 }
Michael J. Spencer 1:f5ac63519541 645
Michael J. Spencer 1:f5ac63519541 646 /* chksum zero must become 0xffff, as zero means 'no checksum' */
Michael J. Spencer 1:f5ac63519541 647 if (udpchksum == 0x0000) {
Michael J. Spencer 1:f5ac63519541 648 udpchksum = 0xffff;
Michael J. Spencer 1:f5ac63519541 649 }
Michael J. Spencer 1:f5ac63519541 650 udphdr->chksum = udpchksum;
Michael J. Spencer 1:f5ac63519541 651 }
Michael J. Spencer 1:f5ac63519541 652 #endif /* CHECKSUM_GEN_UDP */
Michael J. Spencer 1:f5ac63519541 653 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
Michael J. Spencer 1:f5ac63519541 654 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
Michael J. Spencer 1:f5ac63519541 655 /* output to IP */
Michael J. Spencer 1:f5ac63519541 656 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 657 netif->addr_hint = &(pcb->addr_hint);
Michael J. Spencer 1:f5ac63519541 658 #endif /* LWIP_NETIF_HWADDRHINT*/
Michael J. Spencer 1:f5ac63519541 659 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
Michael J. Spencer 1:f5ac63519541 660 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 661 netif->addr_hint = NULL;
Michael J. Spencer 1:f5ac63519541 662 #endif /* LWIP_NETIF_HWADDRHINT*/
Michael J. Spencer 1:f5ac63519541 663 }
Michael J. Spencer 1:f5ac63519541 664 /* TODO: must this be increased even if error occured? */
Michael J. Spencer 1:f5ac63519541 665 snmp_inc_udpoutdatagrams();
Michael J. Spencer 1:f5ac63519541 666
Michael J. Spencer 1:f5ac63519541 667 /* did we chain a separate header pbuf earlier? */
Michael J. Spencer 1:f5ac63519541 668 if (q != p) {
Michael J. Spencer 1:f5ac63519541 669 /* free the header pbuf */
Michael J. Spencer 1:f5ac63519541 670 pbuf_free(q);
Michael J. Spencer 1:f5ac63519541 671 q = NULL;
Michael J. Spencer 1:f5ac63519541 672 /* p is still referenced by the caller, and will live on */
Michael J. Spencer 1:f5ac63519541 673 }
Michael J. Spencer 1:f5ac63519541 674
Michael J. Spencer 1:f5ac63519541 675 UDP_STATS_INC(udp.xmit);
Michael J. Spencer 1:f5ac63519541 676 return err;
Michael J. Spencer 1:f5ac63519541 677 }
Michael J. Spencer 1:f5ac63519541 678
Michael J. Spencer 1:f5ac63519541 679 /**
Michael J. Spencer 1:f5ac63519541 680 * Bind an UDP PCB.
Michael J. Spencer 1:f5ac63519541 681 *
Michael J. Spencer 1:f5ac63519541 682 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
Michael J. Spencer 1:f5ac63519541 683 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
Michael J. Spencer 1:f5ac63519541 684 * bind to all local interfaces.
Michael J. Spencer 1:f5ac63519541 685 * @param port local UDP port to bind with. Use 0 to automatically bind
Michael J. Spencer 1:f5ac63519541 686 * to a random port between UDP_LOCAL_PORT_RANGE_START and
Michael J. Spencer 1:f5ac63519541 687 * UDP_LOCAL_PORT_RANGE_END.
Michael J. Spencer 1:f5ac63519541 688 *
Michael J. Spencer 1:f5ac63519541 689 * ipaddr & port are expected to be in the same byte order as in the pcb.
Michael J. Spencer 1:f5ac63519541 690 *
Michael J. Spencer 1:f5ac63519541 691 * @return lwIP error code.
Michael J. Spencer 1:f5ac63519541 692 * - ERR_OK. Successful. No error occured.
Michael J. Spencer 1:f5ac63519541 693 * - ERR_USE. The specified ipaddr and port are already bound to by
Michael J. Spencer 1:f5ac63519541 694 * another UDP PCB.
Michael J. Spencer 1:f5ac63519541 695 *
Michael J. Spencer 1:f5ac63519541 696 * @see udp_disconnect()
Michael J. Spencer 1:f5ac63519541 697 */
Michael J. Spencer 1:f5ac63519541 698 err_t
Michael J. Spencer 1:f5ac63519541 699 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
Michael J. Spencer 1:f5ac63519541 700 {
Michael J. Spencer 1:f5ac63519541 701 struct udp_pcb *ipcb;
Michael J. Spencer 1:f5ac63519541 702 u8_t rebind;
Michael J. Spencer 1:f5ac63519541 703
Michael J. Spencer 1:f5ac63519541 704 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
Michael J. Spencer 1:f5ac63519541 705 ip_addr_debug_print(UDP_DEBUG, ipaddr);
Michael J. Spencer 1:f5ac63519541 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
Michael J. Spencer 1:f5ac63519541 707
Michael J. Spencer 1:f5ac63519541 708 rebind = 0;
Michael J. Spencer 1:f5ac63519541 709 /* Check for double bind and rebind of the same pcb */
Michael J. Spencer 1:f5ac63519541 710 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
Michael J. Spencer 1:f5ac63519541 711 /* is this UDP PCB already on active list? */
Michael J. Spencer 1:f5ac63519541 712 if (pcb == ipcb) {
Michael J. Spencer 1:f5ac63519541 713 /* pcb may occur at most once in active list */
Michael J. Spencer 1:f5ac63519541 714 LWIP_ASSERT("rebind == 0", rebind == 0);
Michael J. Spencer 1:f5ac63519541 715 /* pcb already in list, just rebind */
Michael J. Spencer 1:f5ac63519541 716 rebind = 1;
Michael J. Spencer 1:f5ac63519541 717 }
Michael J. Spencer 1:f5ac63519541 718
Michael J. Spencer 1:f5ac63519541 719 /* By default, we don't allow to bind to a port that any other udp
Michael J. Spencer 1:f5ac63519541 720 PCB is alread bound to, unless *all* PCBs with that port have tha
Michael J. Spencer 1:f5ac63519541 721 REUSEADDR flag set. */
Michael J. Spencer 1:f5ac63519541 722 #if SO_REUSE
Michael J. Spencer 1:f5ac63519541 723 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
Michael J. Spencer 1:f5ac63519541 724 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
Michael J. Spencer 1:f5ac63519541 725 #else /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 726 /* port matches that of PCB in list and REUSEADDR not set -> reject */
Michael J. Spencer 1:f5ac63519541 727 else {
Michael J. Spencer 1:f5ac63519541 728 #endif /* SO_REUSE */
Michael J. Spencer 1:f5ac63519541 729 if ((ipcb->local_port == port) &&
Michael J. Spencer 1:f5ac63519541 730 /* IP address matches, or one is IP_ADDR_ANY? */
Michael J. Spencer 1:f5ac63519541 731 (ip_addr_isany(&(ipcb->local_ip)) ||
Michael J. Spencer 1:f5ac63519541 732 ip_addr_isany(ipaddr) ||
Michael J. Spencer 1:f5ac63519541 733 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
Michael J. Spencer 1:f5ac63519541 734 /* other PCB already binds to this local IP and port */
Michael J. Spencer 1:f5ac63519541 735 LWIP_DEBUGF(UDP_DEBUG,
Michael J. Spencer 1:f5ac63519541 736 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
Michael J. Spencer 1:f5ac63519541 737 return ERR_USE;
Michael J. Spencer 1:f5ac63519541 738 }
Michael J. Spencer 1:f5ac63519541 739 }
Michael J. Spencer 1:f5ac63519541 740 }
Michael J. Spencer 1:f5ac63519541 741
Michael J. Spencer 1:f5ac63519541 742 ip_addr_set(&pcb->local_ip, ipaddr);
Michael J. Spencer 1:f5ac63519541 743
Michael J. Spencer 1:f5ac63519541 744 /* no port specified? */
Michael J. Spencer 1:f5ac63519541 745 if (port == 0) {
Michael J. Spencer 1:f5ac63519541 746 #ifndef UDP_LOCAL_PORT_RANGE_START
Michael J. Spencer 1:f5ac63519541 747 #define UDP_LOCAL_PORT_RANGE_START 4096
Michael J. Spencer 1:f5ac63519541 748 #define UDP_LOCAL_PORT_RANGE_END 0x7fff
Michael J. Spencer 1:f5ac63519541 749 #endif
Michael J. Spencer 1:f5ac63519541 750 port = UDP_LOCAL_PORT_RANGE_START;
Michael J. Spencer 1:f5ac63519541 751 ipcb = udp_pcbs;
Michael J. Spencer 1:f5ac63519541 752 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
Michael J. Spencer 1:f5ac63519541 753 if (ipcb->local_port == port) {
Michael J. Spencer 1:f5ac63519541 754 /* port is already used by another udp_pcb */
Michael J. Spencer 1:f5ac63519541 755 port++;
Michael J. Spencer 1:f5ac63519541 756 /* restart scanning all udp pcbs */
Michael J. Spencer 1:f5ac63519541 757 ipcb = udp_pcbs;
Michael J. Spencer 1:f5ac63519541 758 } else {
Michael J. Spencer 1:f5ac63519541 759 /* go on with next udp pcb */
Michael J. Spencer 1:f5ac63519541 760 ipcb = ipcb->next;
Michael J. Spencer 1:f5ac63519541 761 }
Michael J. Spencer 1:f5ac63519541 762 }
Michael J. Spencer 1:f5ac63519541 763 if (ipcb != NULL) {
Michael J. Spencer 1:f5ac63519541 764 /* no more ports available in local range */
Michael J. Spencer 1:f5ac63519541 765 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
Michael J. Spencer 1:f5ac63519541 766 return ERR_USE;
Michael J. Spencer 1:f5ac63519541 767 }
Michael J. Spencer 1:f5ac63519541 768 }
Michael J. Spencer 1:f5ac63519541 769 pcb->local_port = port;
Michael J. Spencer 1:f5ac63519541 770 snmp_insert_udpidx_tree(pcb);
Michael J. Spencer 1:f5ac63519541 771 /* pcb not active yet? */
Michael J. Spencer 1:f5ac63519541 772 if (rebind == 0) {
Michael J. Spencer 1:f5ac63519541 773 /* place the PCB on the active list if not already there */
Michael J. Spencer 1:f5ac63519541 774 pcb->next = udp_pcbs;
Michael J. Spencer 1:f5ac63519541 775 udp_pcbs = pcb;
Michael J. Spencer 1:f5ac63519541 776 }
Michael J. Spencer 1:f5ac63519541 777 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Michael J. Spencer 1:f5ac63519541 778 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 779 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Michael J. Spencer 1:f5ac63519541 780 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
Michael J. Spencer 1:f5ac63519541 781 pcb->local_port));
Michael J. Spencer 1:f5ac63519541 782 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 783 }
Michael J. Spencer 1:f5ac63519541 784 /**
Michael J. Spencer 1:f5ac63519541 785 * Connect an UDP PCB.
Michael J. Spencer 1:f5ac63519541 786 *
Michael J. Spencer 1:f5ac63519541 787 * This will associate the UDP PCB with the remote address.
Michael J. Spencer 1:f5ac63519541 788 *
Michael J. Spencer 1:f5ac63519541 789 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
Michael J. Spencer 1:f5ac63519541 790 * @param ipaddr remote IP address to connect with.
Michael J. Spencer 1:f5ac63519541 791 * @param port remote UDP port to connect with.
Michael J. Spencer 1:f5ac63519541 792 *
Michael J. Spencer 1:f5ac63519541 793 * @return lwIP error code
Michael J. Spencer 1:f5ac63519541 794 *
Michael J. Spencer 1:f5ac63519541 795 * ipaddr & port are expected to be in the same byte order as in the pcb.
Michael J. Spencer 1:f5ac63519541 796 *
Michael J. Spencer 1:f5ac63519541 797 * The udp pcb is bound to a random local port if not already bound.
Michael J. Spencer 1:f5ac63519541 798 *
Michael J. Spencer 1:f5ac63519541 799 * @see udp_disconnect()
Michael J. Spencer 1:f5ac63519541 800 */
Michael J. Spencer 1:f5ac63519541 801 err_t
Michael J. Spencer 1:f5ac63519541 802 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
Michael J. Spencer 1:f5ac63519541 803 {
Michael J. Spencer 1:f5ac63519541 804 struct udp_pcb *ipcb;
Michael J. Spencer 1:f5ac63519541 805
Michael J. Spencer 1:f5ac63519541 806 if (pcb->local_port == 0) {
Michael J. Spencer 1:f5ac63519541 807 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
Michael J. Spencer 1:f5ac63519541 808 if (err != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 809 return err;
Michael J. Spencer 1:f5ac63519541 810 }
Michael J. Spencer 1:f5ac63519541 811 }
Michael J. Spencer 1:f5ac63519541 812
Michael J. Spencer 1:f5ac63519541 813 ip_addr_set(&pcb->remote_ip, ipaddr);
Michael J. Spencer 1:f5ac63519541 814 pcb->remote_port = port;
Michael J. Spencer 1:f5ac63519541 815 pcb->flags |= UDP_FLAGS_CONNECTED;
Michael J. Spencer 1:f5ac63519541 816 /** TODO: this functionality belongs in upper layers */
Michael J. Spencer 1:f5ac63519541 817 #ifdef LWIP_UDP_TODO
Michael J. Spencer 1:f5ac63519541 818 /* Nail down local IP for netconn_addr()/getsockname() */
Michael J. Spencer 1:f5ac63519541 819 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
Michael J. Spencer 1:f5ac63519541 820 struct netif *netif;
Michael J. Spencer 1:f5ac63519541 821
Michael J. Spencer 1:f5ac63519541 822 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
Michael J. Spencer 1:f5ac63519541 823 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
Michael J. Spencer 1:f5ac63519541 824 UDP_STATS_INC(udp.rterr);
Michael J. Spencer 1:f5ac63519541 825 return ERR_RTE;
Michael J. Spencer 1:f5ac63519541 826 }
Michael J. Spencer 1:f5ac63519541 827 /** TODO: this will bind the udp pcb locally, to the interface which
Michael J. Spencer 1:f5ac63519541 828 is used to route output packets to the remote address. However, we
Michael J. Spencer 1:f5ac63519541 829 might want to accept incoming packets on any interface! */
Michael J. Spencer 1:f5ac63519541 830 pcb->local_ip = netif->ip_addr;
Michael J. Spencer 1:f5ac63519541 831 } else if (ip_addr_isany(&pcb->remote_ip)) {
Michael J. Spencer 1:f5ac63519541 832 pcb->local_ip.addr = 0;
Michael J. Spencer 1:f5ac63519541 833 }
Michael J. Spencer 1:f5ac63519541 834 #endif
Michael J. Spencer 1:f5ac63519541 835 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Michael J. Spencer 1:f5ac63519541 836 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 837 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Michael J. Spencer 1:f5ac63519541 838 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
Michael J. Spencer 1:f5ac63519541 839 pcb->local_port));
Michael J. Spencer 1:f5ac63519541 840
Michael J. Spencer 1:f5ac63519541 841 /* Insert UDP PCB into the list of active UDP PCBs. */
Michael J. Spencer 1:f5ac63519541 842 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
Michael J. Spencer 1:f5ac63519541 843 if (pcb == ipcb) {
Michael J. Spencer 1:f5ac63519541 844 /* already on the list, just return */
Michael J. Spencer 1:f5ac63519541 845 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 846 }
Michael J. Spencer 1:f5ac63519541 847 }
Michael J. Spencer 1:f5ac63519541 848 /* PCB not yet on the list, add PCB now */
Michael J. Spencer 1:f5ac63519541 849 pcb->next = udp_pcbs;
Michael J. Spencer 1:f5ac63519541 850 udp_pcbs = pcb;
Michael J. Spencer 1:f5ac63519541 851 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 852 }
Michael J. Spencer 1:f5ac63519541 853
Michael J. Spencer 1:f5ac63519541 854 /**
Michael J. Spencer 1:f5ac63519541 855 * Disconnect a UDP PCB
Michael J. Spencer 1:f5ac63519541 856 *
Michael J. Spencer 1:f5ac63519541 857 * @param pcb the udp pcb to disconnect.
Michael J. Spencer 1:f5ac63519541 858 */
Michael J. Spencer 1:f5ac63519541 859 void
Michael J. Spencer 1:f5ac63519541 860 udp_disconnect(struct udp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 861 {
Michael J. Spencer 1:f5ac63519541 862 /* reset remote address association */
Michael J. Spencer 1:f5ac63519541 863 ip_addr_set_any(&pcb->remote_ip);
Michael J. Spencer 1:f5ac63519541 864 pcb->remote_port = 0;
Michael J. Spencer 1:f5ac63519541 865 /* mark PCB as unconnected */
Michael J. Spencer 1:f5ac63519541 866 pcb->flags &= ~UDP_FLAGS_CONNECTED;
Michael J. Spencer 1:f5ac63519541 867 }
Michael J. Spencer 1:f5ac63519541 868
Michael J. Spencer 1:f5ac63519541 869 /**
Michael J. Spencer 1:f5ac63519541 870 * Set a receive callback for a UDP PCB
Michael J. Spencer 1:f5ac63519541 871 *
Michael J. Spencer 1:f5ac63519541 872 * This callback will be called when receiving a datagram for the pcb.
Michael J. Spencer 1:f5ac63519541 873 *
Michael J. Spencer 1:f5ac63519541 874 * @param pcb the pcb for wich to set the recv callback
Michael J. Spencer 1:f5ac63519541 875 * @param recv function pointer of the callback function
Michael J. Spencer 1:f5ac63519541 876 * @param recv_arg additional argument to pass to the callback function
Michael J. Spencer 1:f5ac63519541 877 */
Michael J. Spencer 1:f5ac63519541 878 void
Michael J. Spencer 1:f5ac63519541 879 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
Michael J. Spencer 1:f5ac63519541 880 {
Michael J. Spencer 1:f5ac63519541 881 /* remember recv() callback and user data */
Michael J. Spencer 1:f5ac63519541 882 pcb->recv = recv;
Michael J. Spencer 1:f5ac63519541 883 pcb->recv_arg = recv_arg;
Michael J. Spencer 1:f5ac63519541 884 }
Michael J. Spencer 1:f5ac63519541 885
Michael J. Spencer 1:f5ac63519541 886 /**
Michael J. Spencer 1:f5ac63519541 887 * Remove an UDP PCB.
Michael J. Spencer 1:f5ac63519541 888 *
Michael J. Spencer 1:f5ac63519541 889 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
Michael J. Spencer 1:f5ac63519541 890 * UDP PCB's and the data structure is freed from memory.
Michael J. Spencer 1:f5ac63519541 891 *
Michael J. Spencer 1:f5ac63519541 892 * @see udp_new()
Michael J. Spencer 1:f5ac63519541 893 */
Michael J. Spencer 1:f5ac63519541 894 void
Michael J. Spencer 1:f5ac63519541 895 udp_remove(struct udp_pcb *pcb)
Michael J. Spencer 1:f5ac63519541 896 {
Michael J. Spencer 1:f5ac63519541 897 struct udp_pcb *pcb2;
Michael J. Spencer 1:f5ac63519541 898
Michael J. Spencer 1:f5ac63519541 899 snmp_delete_udpidx_tree(pcb);
Michael J. Spencer 1:f5ac63519541 900 /* pcb to be removed is first in list? */
Michael J. Spencer 1:f5ac63519541 901 if (udp_pcbs == pcb) {
Michael J. Spencer 1:f5ac63519541 902 /* make list start at 2nd pcb */
Michael J. Spencer 1:f5ac63519541 903 udp_pcbs = udp_pcbs->next;
Michael J. Spencer 1:f5ac63519541 904 /* pcb not 1st in list */
Michael J. Spencer 1:f5ac63519541 905 } else {
Michael J. Spencer 1:f5ac63519541 906 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
Michael J. Spencer 1:f5ac63519541 907 /* find pcb in udp_pcbs list */
Michael J. Spencer 1:f5ac63519541 908 if (pcb2->next != NULL && pcb2->next == pcb) {
Michael J. Spencer 1:f5ac63519541 909 /* remove pcb from list */
Michael J. Spencer 1:f5ac63519541 910 pcb2->next = pcb->next;
Michael J. Spencer 1:f5ac63519541 911 }
Michael J. Spencer 1:f5ac63519541 912 }
Michael J. Spencer 1:f5ac63519541 913 }
Michael J. Spencer 1:f5ac63519541 914 memp_free(MEMP_UDP_PCB, pcb);
Michael J. Spencer 1:f5ac63519541 915 }
Michael J. Spencer 1:f5ac63519541 916
Michael J. Spencer 1:f5ac63519541 917 /**
Michael J. Spencer 1:f5ac63519541 918 * Create a UDP PCB.
Michael J. Spencer 1:f5ac63519541 919 *
Michael J. Spencer 1:f5ac63519541 920 * @return The UDP PCB which was created. NULL if the PCB data structure
Michael J. Spencer 1:f5ac63519541 921 * could not be allocated.
Michael J. Spencer 1:f5ac63519541 922 *
Michael J. Spencer 1:f5ac63519541 923 * @see udp_remove()
Michael J. Spencer 1:f5ac63519541 924 */
Michael J. Spencer 1:f5ac63519541 925 struct udp_pcb *
Michael J. Spencer 1:f5ac63519541 926 udp_new(void)
Michael J. Spencer 1:f5ac63519541 927 {
Michael J. Spencer 1:f5ac63519541 928 struct udp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 929 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
Michael J. Spencer 1:f5ac63519541 930 /* could allocate UDP PCB? */
Michael J. Spencer 1:f5ac63519541 931 if (pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 932 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
Michael J. Spencer 1:f5ac63519541 933 * which means checksum is generated over the whole datagram per default
Michael J. Spencer 1:f5ac63519541 934 * (recommended as default by RFC 3828). */
Michael J. Spencer 1:f5ac63519541 935 /* initialize PCB to all zeroes */
Michael J. Spencer 1:f5ac63519541 936 memset(pcb, 0, sizeof(struct udp_pcb));
Michael J. Spencer 1:f5ac63519541 937 pcb->ttl = UDP_TTL;
Michael J. Spencer 1:f5ac63519541 938 }
Michael J. Spencer 1:f5ac63519541 939 return pcb;
Michael J. Spencer 1:f5ac63519541 940 }
Michael J. Spencer 1:f5ac63519541 941
Michael J. Spencer 1:f5ac63519541 942 #if UDP_DEBUG
Michael J. Spencer 1:f5ac63519541 943 /**
Michael J. Spencer 1:f5ac63519541 944 * Print UDP header information for debug purposes.
Michael J. Spencer 1:f5ac63519541 945 *
Michael J. Spencer 1:f5ac63519541 946 * @param udphdr pointer to the udp header in memory.
Michael J. Spencer 1:f5ac63519541 947 */
Michael J. Spencer 1:f5ac63519541 948 void
Michael J. Spencer 1:f5ac63519541 949 udp_debug_print(struct udp_hdr *udphdr)
Michael J. Spencer 1:f5ac63519541 950 {
Michael J. Spencer 1:f5ac63519541 951 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
Michael J. Spencer 1:f5ac63519541 952 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 953 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
Michael J. Spencer 1:f5ac63519541 954 ntohs(udphdr->src), ntohs(udphdr->dest)));
Michael J. Spencer 1:f5ac63519541 955 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 956 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
Michael J. Spencer 1:f5ac63519541 957 ntohs(udphdr->len), ntohs(udphdr->chksum)));
Michael J. Spencer 1:f5ac63519541 958 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Michael J. Spencer 1:f5ac63519541 959 }
Michael J. Spencer 1:f5ac63519541 960 #endif /* UDP_DEBUG */
Michael J. Spencer 1:f5ac63519541 961
Michael J. Spencer 1:f5ac63519541 962 #endif /* LWIP_UDP */