Adam Green / EthernetInterface

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lwip/core/udp.c@0:3b00827bb0b7, 2013-09-07 (annotated)

Committer:
AdamGreen
Date:
Sat Sep 07 21:38:42 2013 +0000
Revision:
0:3b00827bb0b7
Sync to latest network stack source from github.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * User Datagram Protocol module
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 */
AdamGreen 0:3b00827bb0b7 6
AdamGreen 0:3b00827bb0b7 7 /*
AdamGreen 0:3b00827bb0b7 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen 0:3b00827bb0b7 9 * All rights reserved.
AdamGreen 0:3b00827bb0b7 10 *
AdamGreen 0:3b00827bb0b7 11 * Redistribution and use in source and binary forms, with or without modification,
AdamGreen 0:3b00827bb0b7 12 * are permitted provided that the following conditions are met:
AdamGreen 0:3b00827bb0b7 13 *
AdamGreen 0:3b00827bb0b7 14 * 1. Redistributions of source code must retain the above copyright notice,
AdamGreen 0:3b00827bb0b7 15 * this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen 0:3b00827bb0b7 17 * this list of conditions and the following disclaimer in the documentation
AdamGreen 0:3b00827bb0b7 18 * and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 19 * 3. The name of the author may not be used to endorse or promote products
AdamGreen 0:3b00827bb0b7 20 * derived from this software without specific prior written permission.
AdamGreen 0:3b00827bb0b7 21 *
AdamGreen 0:3b00827bb0b7 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen 0:3b00827bb0b7 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen 0:3b00827bb0b7 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen 0:3b00827bb0b7 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen 0:3b00827bb0b7 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen 0:3b00827bb0b7 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen 0:3b00827bb0b7 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen 0:3b00827bb0b7 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen 0:3b00827bb0b7 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen 0:3b00827bb0b7 31 * OF SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 32 *
AdamGreen 0:3b00827bb0b7 33 * This file is part of the lwIP TCP/IP stack.
AdamGreen 0:3b00827bb0b7 34 *
AdamGreen 0:3b00827bb0b7 35 * Author: Adam Dunkels <adam@sics.se>
AdamGreen 0:3b00827bb0b7 36 *
AdamGreen 0:3b00827bb0b7 37 */
AdamGreen 0:3b00827bb0b7 38
AdamGreen 0:3b00827bb0b7 39
AdamGreen 0:3b00827bb0b7 40 /* udp.c
AdamGreen 0:3b00827bb0b7 41 *
AdamGreen 0:3b00827bb0b7 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
AdamGreen 0:3b00827bb0b7 43 *
AdamGreen 0:3b00827bb0b7 44 */
AdamGreen 0:3b00827bb0b7 45
AdamGreen 0:3b00827bb0b7 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
AdamGreen 0:3b00827bb0b7 47 */
AdamGreen 0:3b00827bb0b7 48
AdamGreen 0:3b00827bb0b7 49 #include "lwip/opt.h"
AdamGreen 0:3b00827bb0b7 50
AdamGreen 0:3b00827bb0b7 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
AdamGreen 0:3b00827bb0b7 52
AdamGreen 0:3b00827bb0b7 53 #include "lwip/udp.h"
AdamGreen 0:3b00827bb0b7 54 #include "lwip/def.h"
AdamGreen 0:3b00827bb0b7 55 #include "lwip/memp.h"
AdamGreen 0:3b00827bb0b7 56 #include "lwip/inet_chksum.h"
AdamGreen 0:3b00827bb0b7 57 #include "lwip/ip_addr.h"
AdamGreen 0:3b00827bb0b7 58 #include "lwip/netif.h"
AdamGreen 0:3b00827bb0b7 59 #include "lwip/icmp.h"
AdamGreen 0:3b00827bb0b7 60 #include "lwip/stats.h"
AdamGreen 0:3b00827bb0b7 61 #include "lwip/snmp.h"
AdamGreen 0:3b00827bb0b7 62 #include "arch/perf.h"
AdamGreen 0:3b00827bb0b7 63 #include "lwip/dhcp.h"
AdamGreen 0:3b00827bb0b7 64
AdamGreen 0:3b00827bb0b7 65 #include <string.h>
AdamGreen 0:3b00827bb0b7 66
AdamGreen 0:3b00827bb0b7 67 /* The list of UDP PCBs */
AdamGreen 0:3b00827bb0b7 68 /* exported in udp.h (was static) */
AdamGreen 0:3b00827bb0b7 69 struct udp_pcb *udp_pcbs;
AdamGreen 0:3b00827bb0b7 70
AdamGreen 0:3b00827bb0b7 71 /**
AdamGreen 0:3b00827bb0b7 72 * Process an incoming UDP datagram.
AdamGreen 0:3b00827bb0b7 73 *
AdamGreen 0:3b00827bb0b7 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
AdamGreen 0:3b00827bb0b7 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
AdamGreen 0:3b00827bb0b7 76 * recv function. If no pcb is found or the datagram is incorrect, the
AdamGreen 0:3b00827bb0b7 77 * pbuf is freed.
AdamGreen 0:3b00827bb0b7 78 *
AdamGreen 0:3b00827bb0b7 79 * @param p pbuf to be demultiplexed to a UDP PCB.
AdamGreen 0:3b00827bb0b7 80 * @param inp network interface on which the datagram was received.
AdamGreen 0:3b00827bb0b7 81 *
AdamGreen 0:3b00827bb0b7 82 */
AdamGreen 0:3b00827bb0b7 83 void
AdamGreen 0:3b00827bb0b7 84 udp_input(struct pbuf *p, struct netif *inp)
AdamGreen 0:3b00827bb0b7 85 {
AdamGreen 0:3b00827bb0b7 86 struct udp_hdr *udphdr;
AdamGreen 0:3b00827bb0b7 87 struct udp_pcb *pcb, *prev;
AdamGreen 0:3b00827bb0b7 88 struct udp_pcb *uncon_pcb;
AdamGreen 0:3b00827bb0b7 89 struct ip_hdr *iphdr;
AdamGreen 0:3b00827bb0b7 90 u16_t src, dest;
AdamGreen 0:3b00827bb0b7 91 u8_t local_match;
AdamGreen 0:3b00827bb0b7 92 u8_t broadcast;
AdamGreen 0:3b00827bb0b7 93
AdamGreen 0:3b00827bb0b7 94 PERF_START;
AdamGreen 0:3b00827bb0b7 95
AdamGreen 0:3b00827bb0b7 96 UDP_STATS_INC(udp.recv);
AdamGreen 0:3b00827bb0b7 97
AdamGreen 0:3b00827bb0b7 98 iphdr = (struct ip_hdr *)p->payload;
AdamGreen 0:3b00827bb0b7 99
AdamGreen 0:3b00827bb0b7 100 /* Check minimum length (IP header + UDP header)
AdamGreen 0:3b00827bb0b7 101 * and move payload pointer to UDP header */
AdamGreen 0:3b00827bb0b7 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
AdamGreen 0:3b00827bb0b7 103 /* drop short packets */
AdamGreen 0:3b00827bb0b7 104 LWIP_DEBUGF(UDP_DEBUG,
AdamGreen 0:3b00827bb0b7 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
AdamGreen 0:3b00827bb0b7 106 UDP_STATS_INC(udp.lenerr);
AdamGreen 0:3b00827bb0b7 107 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 108 snmp_inc_udpinerrors();
AdamGreen 0:3b00827bb0b7 109 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 110 goto end;
AdamGreen 0:3b00827bb0b7 111 }
AdamGreen 0:3b00827bb0b7 112
AdamGreen 0:3b00827bb0b7 113 udphdr = (struct udp_hdr *)p->payload;
AdamGreen 0:3b00827bb0b7 114
AdamGreen 0:3b00827bb0b7 115 /* is broadcast packet ? */
AdamGreen 0:3b00827bb0b7 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
AdamGreen 0:3b00827bb0b7 117
AdamGreen 0:3b00827bb0b7 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
AdamGreen 0:3b00827bb0b7 119
AdamGreen 0:3b00827bb0b7 120 /* convert src and dest ports to host byte order */
AdamGreen 0:3b00827bb0b7 121 src = ntohs(udphdr->src);
AdamGreen 0:3b00827bb0b7 122 dest = ntohs(udphdr->dest);
AdamGreen 0:3b00827bb0b7 123
AdamGreen 0:3b00827bb0b7 124 udp_debug_print(udphdr);
AdamGreen 0:3b00827bb0b7 125
AdamGreen 0:3b00827bb0b7 126 /* print the UDP source and destination */
AdamGreen 0:3b00827bb0b7 127 LWIP_DEBUGF(UDP_DEBUG,
AdamGreen 0:3b00827bb0b7 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
AdamGreen 0:3b00827bb0b7 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
AdamGreen 0:3b00827bb0b7 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
AdamGreen 0:3b00827bb0b7 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
AdamGreen 0:3b00827bb0b7 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
AdamGreen 0:3b00827bb0b7 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
AdamGreen 0:3b00827bb0b7 134
AdamGreen 0:3b00827bb0b7 135 #if LWIP_DHCP
AdamGreen 0:3b00827bb0b7 136 pcb = NULL;
AdamGreen 0:3b00827bb0b7 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
AdamGreen 0:3b00827bb0b7 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
AdamGreen 0:3b00827bb0b7 139 if (dest == DHCP_CLIENT_PORT) {
AdamGreen 0:3b00827bb0b7 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
AdamGreen 0:3b00827bb0b7 141 if (src == DHCP_SERVER_PORT) {
AdamGreen 0:3b00827bb0b7 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
AdamGreen 0:3b00827bb0b7 143 /* accept the packe if
AdamGreen 0:3b00827bb0b7 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
AdamGreen 0:3b00827bb0b7 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
AdamGreen 0:3b00827bb0b7 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
AdamGreen 0:3b00827bb0b7 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
AdamGreen 0:3b00827bb0b7 148 pcb = inp->dhcp->pcb;
AdamGreen 0:3b00827bb0b7 149 }
AdamGreen 0:3b00827bb0b7 150 }
AdamGreen 0:3b00827bb0b7 151 }
AdamGreen 0:3b00827bb0b7 152 } else
AdamGreen 0:3b00827bb0b7 153 #endif /* LWIP_DHCP */
AdamGreen 0:3b00827bb0b7 154 {
AdamGreen 0:3b00827bb0b7 155 prev = NULL;
AdamGreen 0:3b00827bb0b7 156 local_match = 0;
AdamGreen 0:3b00827bb0b7 157 uncon_pcb = NULL;
AdamGreen 0:3b00827bb0b7 158 /* Iterate through the UDP pcb list for a matching pcb.
AdamGreen 0:3b00827bb0b7 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
AdamGreen 0:3b00827bb0b7 160 * preferred. If no perfect match is found, the first unconnected pcb that
AdamGreen 0:3b00827bb0b7 161 * matches the local port and ip address gets the datagram. */
AdamGreen 0:3b00827bb0b7 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
AdamGreen 0:3b00827bb0b7 163 local_match = 0;
AdamGreen 0:3b00827bb0b7 164 /* print the PCB local and remote address */
AdamGreen 0:3b00827bb0b7 165 LWIP_DEBUGF(UDP_DEBUG,
AdamGreen 0:3b00827bb0b7 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
AdamGreen 0:3b00827bb0b7 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
AdamGreen 0:3b00827bb0b7 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
AdamGreen 0:3b00827bb0b7 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
AdamGreen 0:3b00827bb0b7 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
AdamGreen 0:3b00827bb0b7 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
AdamGreen 0:3b00827bb0b7 172
AdamGreen 0:3b00827bb0b7 173 /* compare PCB local addr+port to UDP destination addr+port */
AdamGreen 0:3b00827bb0b7 174 if ((pcb->local_port == dest) &&
AdamGreen 0:3b00827bb0b7 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
AdamGreen 0:3b00827bb0b7 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
AdamGreen 0:3b00827bb0b7 177 #if LWIP_IGMP
AdamGreen 0:3b00827bb0b7 178 ip_addr_ismulticast(&current_iphdr_dest) ||
AdamGreen 0:3b00827bb0b7 179 #endif /* LWIP_IGMP */
AdamGreen 0:3b00827bb0b7 180 #if IP_SOF_BROADCAST_RECV
AdamGreen 0:3b00827bb0b7 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
AdamGreen 0:3b00827bb0b7 182 #else /* IP_SOF_BROADCAST_RECV */
AdamGreen 0:3b00827bb0b7 183 (broadcast))) {
AdamGreen 0:3b00827bb0b7 184 #endif /* IP_SOF_BROADCAST_RECV */
AdamGreen 0:3b00827bb0b7 185 local_match = 1;
AdamGreen 0:3b00827bb0b7 186 if ((uncon_pcb == NULL) &&
AdamGreen 0:3b00827bb0b7 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
AdamGreen 0:3b00827bb0b7 188 /* the first unconnected matching PCB */
AdamGreen 0:3b00827bb0b7 189 uncon_pcb = pcb;
AdamGreen 0:3b00827bb0b7 190 }
AdamGreen 0:3b00827bb0b7 191 }
AdamGreen 0:3b00827bb0b7 192 /* compare PCB remote addr+port to UDP source addr+port */
AdamGreen 0:3b00827bb0b7 193 if ((local_match != 0) &&
AdamGreen 0:3b00827bb0b7 194 (pcb->remote_port == src) &&
AdamGreen 0:3b00827bb0b7 195 (ip_addr_isany(&pcb->remote_ip) ||
AdamGreen 0:3b00827bb0b7 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
AdamGreen 0:3b00827bb0b7 197 /* the first fully matching PCB */
AdamGreen 0:3b00827bb0b7 198 if (prev != NULL) {
AdamGreen 0:3b00827bb0b7 199 /* move the pcb to the front of udp_pcbs so that is
AdamGreen 0:3b00827bb0b7 200 found faster next time */
AdamGreen 0:3b00827bb0b7 201 prev->next = pcb->next;
AdamGreen 0:3b00827bb0b7 202 pcb->next = udp_pcbs;
AdamGreen 0:3b00827bb0b7 203 udp_pcbs = pcb;
AdamGreen 0:3b00827bb0b7 204 } else {
AdamGreen 0:3b00827bb0b7 205 UDP_STATS_INC(udp.cachehit);
AdamGreen 0:3b00827bb0b7 206 }
AdamGreen 0:3b00827bb0b7 207 break;
AdamGreen 0:3b00827bb0b7 208 }
AdamGreen 0:3b00827bb0b7 209 prev = pcb;
AdamGreen 0:3b00827bb0b7 210 }
AdamGreen 0:3b00827bb0b7 211 /* no fully matching pcb found? then look for an unconnected pcb */
AdamGreen 0:3b00827bb0b7 212 if (pcb == NULL) {
AdamGreen 0:3b00827bb0b7 213 pcb = uncon_pcb;
AdamGreen 0:3b00827bb0b7 214 }
AdamGreen 0:3b00827bb0b7 215 }
AdamGreen 0:3b00827bb0b7 216
AdamGreen 0:3b00827bb0b7 217 /* Check checksum if this is a match or if it was directed at us. */
AdamGreen 0:3b00827bb0b7 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
AdamGreen 0:3b00827bb0b7 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
AdamGreen 0:3b00827bb0b7 220 #if LWIP_UDPLITE
AdamGreen 0:3b00827bb0b7 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
AdamGreen 0:3b00827bb0b7 222 /* Do the UDP Lite checksum */
AdamGreen 0:3b00827bb0b7 223 #if CHECKSUM_CHECK_UDP
AdamGreen 0:3b00827bb0b7 224 u16_t chklen = ntohs(udphdr->len);
AdamGreen 0:3b00827bb0b7 225 if (chklen < sizeof(struct udp_hdr)) {
AdamGreen 0:3b00827bb0b7 226 if (chklen == 0) {
AdamGreen 0:3b00827bb0b7 227 /* For UDP-Lite, checksum length of 0 means checksum
AdamGreen 0:3b00827bb0b7 228 over the complete packet (See RFC 3828 chap. 3.1) */
AdamGreen 0:3b00827bb0b7 229 chklen = p->tot_len;
AdamGreen 0:3b00827bb0b7 230 } else {
AdamGreen 0:3b00827bb0b7 231 /* At least the UDP-Lite header must be covered by the
AdamGreen 0:3b00827bb0b7 232 checksum! (Again, see RFC 3828 chap. 3.1) */
AdamGreen 0:3b00827bb0b7 233 UDP_STATS_INC(udp.chkerr);
AdamGreen 0:3b00827bb0b7 234 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 235 snmp_inc_udpinerrors();
AdamGreen 0:3b00827bb0b7 236 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 237 goto end;
AdamGreen 0:3b00827bb0b7 238 }
AdamGreen 0:3b00827bb0b7 239 }
AdamGreen 0:3b00827bb0b7 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
AdamGreen 0:3b00827bb0b7 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
AdamGreen 0:3b00827bb0b7 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
AdamGreen 0:3b00827bb0b7 244 UDP_STATS_INC(udp.chkerr);
AdamGreen 0:3b00827bb0b7 245 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 246 snmp_inc_udpinerrors();
AdamGreen 0:3b00827bb0b7 247 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 248 goto end;
AdamGreen 0:3b00827bb0b7 249 }
AdamGreen 0:3b00827bb0b7 250 #endif /* CHECKSUM_CHECK_UDP */
AdamGreen 0:3b00827bb0b7 251 } else
AdamGreen 0:3b00827bb0b7 252 #endif /* LWIP_UDPLITE */
AdamGreen 0:3b00827bb0b7 253 {
AdamGreen 0:3b00827bb0b7 254 #if CHECKSUM_CHECK_UDP
AdamGreen 0:3b00827bb0b7 255 if (udphdr->chksum != 0) {
AdamGreen 0:3b00827bb0b7 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
AdamGreen 0:3b00827bb0b7 257 IP_PROTO_UDP, p->tot_len) != 0) {
AdamGreen 0:3b00827bb0b7 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
AdamGreen 0:3b00827bb0b7 260 UDP_STATS_INC(udp.chkerr);
AdamGreen 0:3b00827bb0b7 261 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 262 snmp_inc_udpinerrors();
AdamGreen 0:3b00827bb0b7 263 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 264 goto end;
AdamGreen 0:3b00827bb0b7 265 }
AdamGreen 0:3b00827bb0b7 266 }
AdamGreen 0:3b00827bb0b7 267 #endif /* CHECKSUM_CHECK_UDP */
AdamGreen 0:3b00827bb0b7 268 }
AdamGreen 0:3b00827bb0b7 269 if(pbuf_header(p, -UDP_HLEN)) {
AdamGreen 0:3b00827bb0b7 270 /* Can we cope with this failing? Just assert for now */
AdamGreen 0:3b00827bb0b7 271 LWIP_ASSERT("pbuf_header failed\n", 0);
AdamGreen 0:3b00827bb0b7 272 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 273 snmp_inc_udpinerrors();
AdamGreen 0:3b00827bb0b7 274 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 275 goto end;
AdamGreen 0:3b00827bb0b7 276 }
AdamGreen 0:3b00827bb0b7 277 if (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 278 snmp_inc_udpindatagrams();
AdamGreen 0:3b00827bb0b7 279 #if SO_REUSE && SO_REUSE_RXTOALL
AdamGreen 0:3b00827bb0b7 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
AdamGreen 0:3b00827bb0b7 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
AdamGreen 0:3b00827bb0b7 282 /* pass broadcast- or multicast packets to all multicast pcbs
AdamGreen 0:3b00827bb0b7 283 if SOF_REUSEADDR is set on the first match */
AdamGreen 0:3b00827bb0b7 284 struct udp_pcb *mpcb;
AdamGreen 0:3b00827bb0b7 285 u8_t p_header_changed = 0;
AdamGreen 0:3b00827bb0b7 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
AdamGreen 0:3b00827bb0b7 287 if (mpcb != pcb) {
AdamGreen 0:3b00827bb0b7 288 /* compare PCB local addr+port to UDP destination addr+port */
AdamGreen 0:3b00827bb0b7 289 if ((mpcb->local_port == dest) &&
AdamGreen 0:3b00827bb0b7 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
AdamGreen 0:3b00827bb0b7 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
AdamGreen 0:3b00827bb0b7 292 #if LWIP_IGMP
AdamGreen 0:3b00827bb0b7 293 ip_addr_ismulticast(&current_iphdr_dest) ||
AdamGreen 0:3b00827bb0b7 294 #endif /* LWIP_IGMP */
AdamGreen 0:3b00827bb0b7 295 #if IP_SOF_BROADCAST_RECV
AdamGreen 0:3b00827bb0b7 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
AdamGreen 0:3b00827bb0b7 297 #else /* IP_SOF_BROADCAST_RECV */
AdamGreen 0:3b00827bb0b7 298 (broadcast))) {
AdamGreen 0:3b00827bb0b7 299 #endif /* IP_SOF_BROADCAST_RECV */
AdamGreen 0:3b00827bb0b7 300 /* pass a copy of the packet to all local matches */
AdamGreen 0:3b00827bb0b7 301 if (mpcb->recv != NULL) {
AdamGreen 0:3b00827bb0b7 302 struct pbuf *q;
AdamGreen 0:3b00827bb0b7 303 /* for that, move payload to IP header again */
AdamGreen 0:3b00827bb0b7 304 if (p_header_changed == 0) {
AdamGreen 0:3b00827bb0b7 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
AdamGreen 0:3b00827bb0b7 306 p_header_changed = 1;
AdamGreen 0:3b00827bb0b7 307 }
AdamGreen 0:3b00827bb0b7 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
AdamGreen 0:3b00827bb0b7 309 if (q != NULL) {
AdamGreen 0:3b00827bb0b7 310 err_t err = pbuf_copy(q, p);
AdamGreen 0:3b00827bb0b7 311 if (err == ERR_OK) {
AdamGreen 0:3b00827bb0b7 312 /* move payload to UDP data */
AdamGreen 0:3b00827bb0b7 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
AdamGreen 0:3b00827bb0b7 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
AdamGreen 0:3b00827bb0b7 315 }
AdamGreen 0:3b00827bb0b7 316 }
AdamGreen 0:3b00827bb0b7 317 }
AdamGreen 0:3b00827bb0b7 318 }
AdamGreen 0:3b00827bb0b7 319 }
AdamGreen 0:3b00827bb0b7 320 }
AdamGreen 0:3b00827bb0b7 321 if (p_header_changed) {
AdamGreen 0:3b00827bb0b7 322 /* and move payload to UDP data again */
AdamGreen 0:3b00827bb0b7 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
AdamGreen 0:3b00827bb0b7 324 }
AdamGreen 0:3b00827bb0b7 325 }
AdamGreen 0:3b00827bb0b7 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
AdamGreen 0:3b00827bb0b7 327 /* callback */
AdamGreen 0:3b00827bb0b7 328 if (pcb->recv != NULL) {
AdamGreen 0:3b00827bb0b7 329 /* now the recv function is responsible for freeing p */
AdamGreen 0:3b00827bb0b7 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
AdamGreen 0:3b00827bb0b7 331 } else {
AdamGreen 0:3b00827bb0b7 332 /* no recv function registered? then we have to free the pbuf! */
AdamGreen 0:3b00827bb0b7 333 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 334 goto end;
AdamGreen 0:3b00827bb0b7 335 }
AdamGreen 0:3b00827bb0b7 336 } else {
AdamGreen 0:3b00827bb0b7 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
AdamGreen 0:3b00827bb0b7 338
AdamGreen 0:3b00827bb0b7 339 #if LWIP_ICMP
AdamGreen 0:3b00827bb0b7 340 /* No match was found, send ICMP destination port unreachable unless
AdamGreen 0:3b00827bb0b7 341 destination address was broadcast/multicast. */
AdamGreen 0:3b00827bb0b7 342 if (!broadcast &&
AdamGreen 0:3b00827bb0b7 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
AdamGreen 0:3b00827bb0b7 344 /* move payload pointer back to ip header */
AdamGreen 0:3b00827bb0b7 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
AdamGreen 0:3b00827bb0b7 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
AdamGreen 0:3b00827bb0b7 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
AdamGreen 0:3b00827bb0b7 348 }
AdamGreen 0:3b00827bb0b7 349 #endif /* LWIP_ICMP */
AdamGreen 0:3b00827bb0b7 350 UDP_STATS_INC(udp.proterr);
AdamGreen 0:3b00827bb0b7 351 UDP_STATS_INC(udp.drop);
AdamGreen 0:3b00827bb0b7 352 snmp_inc_udpnoports();
AdamGreen 0:3b00827bb0b7 353 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 354 }
AdamGreen 0:3b00827bb0b7 355 } else {
AdamGreen 0:3b00827bb0b7 356 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 357 }
AdamGreen 0:3b00827bb0b7 358 end:
AdamGreen 0:3b00827bb0b7 359 PERF_STOP("udp_input");
AdamGreen 0:3b00827bb0b7 360 }
AdamGreen 0:3b00827bb0b7 361
AdamGreen 0:3b00827bb0b7 362 /**
AdamGreen 0:3b00827bb0b7 363 * Send data using UDP.
AdamGreen 0:3b00827bb0b7 364 *
AdamGreen 0:3b00827bb0b7 365 * @param pcb UDP PCB used to send the data.
AdamGreen 0:3b00827bb0b7 366 * @param p chain of pbuf's to be sent.
AdamGreen 0:3b00827bb0b7 367 *
AdamGreen 0:3b00827bb0b7 368 * The datagram will be sent to the current remote_ip & remote_port
AdamGreen 0:3b00827bb0b7 369 * stored in pcb. If the pcb is not bound to a port, it will
AdamGreen 0:3b00827bb0b7 370 * automatically be bound to a random port.
AdamGreen 0:3b00827bb0b7 371 *
AdamGreen 0:3b00827bb0b7 372 * @return lwIP error code.
AdamGreen 0:3b00827bb0b7 373 * - ERR_OK. Successful. No error occured.
AdamGreen 0:3b00827bb0b7 374 * - ERR_MEM. Out of memory.
AdamGreen 0:3b00827bb0b7 375 * - ERR_RTE. Could not find route to destination address.
AdamGreen 0:3b00827bb0b7 376 * - More errors could be returned by lower protocol layers.
AdamGreen 0:3b00827bb0b7 377 *
AdamGreen 0:3b00827bb0b7 378 * @see udp_disconnect() udp_sendto()
AdamGreen 0:3b00827bb0b7 379 */
AdamGreen 0:3b00827bb0b7 380 err_t
AdamGreen 0:3b00827bb0b7 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
AdamGreen 0:3b00827bb0b7 382 {
AdamGreen 0:3b00827bb0b7 383 /* send to the packet using remote ip and port stored in the pcb */
AdamGreen 0:3b00827bb0b7 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
AdamGreen 0:3b00827bb0b7 385 }
AdamGreen 0:3b00827bb0b7 386
AdamGreen 0:3b00827bb0b7 387 #if LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 388 /** Same as udp_send() but with checksum
AdamGreen 0:3b00827bb0b7 389 */
AdamGreen 0:3b00827bb0b7 390 err_t
AdamGreen 0:3b00827bb0b7 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
AdamGreen 0:3b00827bb0b7 392 u8_t have_chksum, u16_t chksum)
AdamGreen 0:3b00827bb0b7 393 {
AdamGreen 0:3b00827bb0b7 394 /* send to the packet using remote ip and port stored in the pcb */
AdamGreen 0:3b00827bb0b7 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
AdamGreen 0:3b00827bb0b7 396 have_chksum, chksum);
AdamGreen 0:3b00827bb0b7 397 }
AdamGreen 0:3b00827bb0b7 398 #endif /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 399
AdamGreen 0:3b00827bb0b7 400 /**
AdamGreen 0:3b00827bb0b7 401 * Send data to a specified address using UDP.
AdamGreen 0:3b00827bb0b7 402 *
AdamGreen 0:3b00827bb0b7 403 * @param pcb UDP PCB used to send the data.
AdamGreen 0:3b00827bb0b7 404 * @param p chain of pbuf's to be sent.
AdamGreen 0:3b00827bb0b7 405 * @param dst_ip Destination IP address.
AdamGreen 0:3b00827bb0b7 406 * @param dst_port Destination UDP port.
AdamGreen 0:3b00827bb0b7 407 *
AdamGreen 0:3b00827bb0b7 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
AdamGreen 0:3b00827bb0b7 409 *
AdamGreen 0:3b00827bb0b7 410 * If the PCB already has a remote address association, it will
AdamGreen 0:3b00827bb0b7 411 * be restored after the data is sent.
AdamGreen 0:3b00827bb0b7 412 *
AdamGreen 0:3b00827bb0b7 413 * @return lwIP error code (@see udp_send for possible error codes)
AdamGreen 0:3b00827bb0b7 414 *
AdamGreen 0:3b00827bb0b7 415 * @see udp_disconnect() udp_send()
AdamGreen 0:3b00827bb0b7 416 */
AdamGreen 0:3b00827bb0b7 417 err_t
AdamGreen 0:3b00827bb0b7 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
AdamGreen 0:3b00827bb0b7 419 ip_addr_t *dst_ip, u16_t dst_port)
AdamGreen 0:3b00827bb0b7 420 {
AdamGreen 0:3b00827bb0b7 421 #if LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
AdamGreen 0:3b00827bb0b7 423 }
AdamGreen 0:3b00827bb0b7 424
AdamGreen 0:3b00827bb0b7 425 /** Same as udp_sendto(), but with checksum */
AdamGreen 0:3b00827bb0b7 426 err_t
AdamGreen 0:3b00827bb0b7 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
AdamGreen 0:3b00827bb0b7 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
AdamGreen 0:3b00827bb0b7 429 {
AdamGreen 0:3b00827bb0b7 430 #endif /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 431 struct netif *netif;
AdamGreen 0:3b00827bb0b7 432
AdamGreen 0:3b00827bb0b7 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
AdamGreen 0:3b00827bb0b7 434
AdamGreen 0:3b00827bb0b7 435 /* find the outgoing network interface for this packet */
AdamGreen 0:3b00827bb0b7 436 #if LWIP_IGMP
AdamGreen 0:3b00827bb0b7 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
AdamGreen 0:3b00827bb0b7 438 #else
AdamGreen 0:3b00827bb0b7 439 netif = ip_route(dst_ip);
AdamGreen 0:3b00827bb0b7 440 #endif /* LWIP_IGMP */
AdamGreen 0:3b00827bb0b7 441
AdamGreen 0:3b00827bb0b7 442 /* no outgoing network interface could be found? */
AdamGreen 0:3b00827bb0b7 443 if (netif == NULL) {
AdamGreen 0:3b00827bb0b7 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen 0:3b00827bb0b7 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
AdamGreen 0:3b00827bb0b7 446 UDP_STATS_INC(udp.rterr);
AdamGreen 0:3b00827bb0b7 447 return ERR_RTE;
AdamGreen 0:3b00827bb0b7 448 }
AdamGreen 0:3b00827bb0b7 449 #if LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
AdamGreen 0:3b00827bb0b7 451 #else /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
AdamGreen 0:3b00827bb0b7 453 #endif /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 454 }
AdamGreen 0:3b00827bb0b7 455
AdamGreen 0:3b00827bb0b7 456 /**
AdamGreen 0:3b00827bb0b7 457 * Send data to a specified address using UDP.
AdamGreen 0:3b00827bb0b7 458 * The netif used for sending can be specified.
AdamGreen 0:3b00827bb0b7 459 *
AdamGreen 0:3b00827bb0b7 460 * This function exists mainly for DHCP, to be able to send UDP packets
AdamGreen 0:3b00827bb0b7 461 * on a netif that is still down.
AdamGreen 0:3b00827bb0b7 462 *
AdamGreen 0:3b00827bb0b7 463 * @param pcb UDP PCB used to send the data.
AdamGreen 0:3b00827bb0b7 464 * @param p chain of pbuf's to be sent.
AdamGreen 0:3b00827bb0b7 465 * @param dst_ip Destination IP address.
AdamGreen 0:3b00827bb0b7 466 * @param dst_port Destination UDP port.
AdamGreen 0:3b00827bb0b7 467 * @param netif the netif used for sending.
AdamGreen 0:3b00827bb0b7 468 *
AdamGreen 0:3b00827bb0b7 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
AdamGreen 0:3b00827bb0b7 470 *
AdamGreen 0:3b00827bb0b7 471 * @return lwIP error code (@see udp_send for possible error codes)
AdamGreen 0:3b00827bb0b7 472 *
AdamGreen 0:3b00827bb0b7 473 * @see udp_disconnect() udp_send()
AdamGreen 0:3b00827bb0b7 474 */
AdamGreen 0:3b00827bb0b7 475 err_t
AdamGreen 0:3b00827bb0b7 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
AdamGreen 0:3b00827bb0b7 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
AdamGreen 0:3b00827bb0b7 478 {
AdamGreen 0:3b00827bb0b7 479 #if LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
AdamGreen 0:3b00827bb0b7 481 }
AdamGreen 0:3b00827bb0b7 482
AdamGreen 0:3b00827bb0b7 483 /** Same as udp_sendto_if(), but with checksum */
AdamGreen 0:3b00827bb0b7 484 err_t
AdamGreen 0:3b00827bb0b7 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
AdamGreen 0:3b00827bb0b7 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
AdamGreen 0:3b00827bb0b7 487 u16_t chksum)
AdamGreen 0:3b00827bb0b7 488 {
AdamGreen 0:3b00827bb0b7 489 #endif /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 490 struct udp_hdr *udphdr;
AdamGreen 0:3b00827bb0b7 491 ip_addr_t *src_ip;
AdamGreen 0:3b00827bb0b7 492 err_t err;
AdamGreen 0:3b00827bb0b7 493 struct pbuf *q; /* q will be sent down the stack */
AdamGreen 0:3b00827bb0b7 494
AdamGreen 0:3b00827bb0b7 495 #if IP_SOF_BROADCAST
AdamGreen 0:3b00827bb0b7 496 /* broadcast filter? */
AdamGreen 0:3b00827bb0b7 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
AdamGreen 0:3b00827bb0b7 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
AdamGreen 0:3b00827bb0b7 500 return ERR_VAL;
AdamGreen 0:3b00827bb0b7 501 }
AdamGreen 0:3b00827bb0b7 502 #endif /* IP_SOF_BROADCAST */
AdamGreen 0:3b00827bb0b7 503
AdamGreen 0:3b00827bb0b7 504 /* if the PCB is not yet bound to a port, bind it here */
AdamGreen 0:3b00827bb0b7 505 if (pcb->local_port == 0) {
AdamGreen 0:3b00827bb0b7 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
AdamGreen 0:3b00827bb0b7 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
AdamGreen 0:3b00827bb0b7 508 if (err != ERR_OK) {
AdamGreen 0:3b00827bb0b7 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
AdamGreen 0:3b00827bb0b7 510 return err;
AdamGreen 0:3b00827bb0b7 511 }
AdamGreen 0:3b00827bb0b7 512 }
AdamGreen 0:3b00827bb0b7 513
AdamGreen 0:3b00827bb0b7 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
AdamGreen 0:3b00827bb0b7 515 if (pbuf_header(p, UDP_HLEN)) {
AdamGreen 0:3b00827bb0b7 516 /* allocate header in a separate new pbuf */
AdamGreen 0:3b00827bb0b7 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
AdamGreen 0:3b00827bb0b7 518 /* new header pbuf could not be allocated? */
AdamGreen 0:3b00827bb0b7 519 if (q == NULL) {
AdamGreen 0:3b00827bb0b7 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
AdamGreen 0:3b00827bb0b7 521 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 522 }
AdamGreen 0:3b00827bb0b7 523 if (p->tot_len != 0) {
AdamGreen 0:3b00827bb0b7 524 /* chain header q in front of given pbuf p (only if p contains data) */
AdamGreen 0:3b00827bb0b7 525 pbuf_chain(q, p);
AdamGreen 0:3b00827bb0b7 526 }
AdamGreen 0:3b00827bb0b7 527 /* first pbuf q points to header pbuf */
AdamGreen 0:3b00827bb0b7 528 LWIP_DEBUGF(UDP_DEBUG,
AdamGreen 0:3b00827bb0b7 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
AdamGreen 0:3b00827bb0b7 530 } else {
AdamGreen 0:3b00827bb0b7 531 /* adding space for header within p succeeded */
AdamGreen 0:3b00827bb0b7 532 /* first pbuf q equals given pbuf */
AdamGreen 0:3b00827bb0b7 533 q = p;
AdamGreen 0:3b00827bb0b7 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
AdamGreen 0:3b00827bb0b7 535 }
AdamGreen 0:3b00827bb0b7 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
AdamGreen 0:3b00827bb0b7 537 (q->len >= sizeof(struct udp_hdr)));
AdamGreen 0:3b00827bb0b7 538 /* q now represents the packet to be sent */
AdamGreen 0:3b00827bb0b7 539 udphdr = (struct udp_hdr *)q->payload;
AdamGreen 0:3b00827bb0b7 540 udphdr->src = htons(pcb->local_port);
AdamGreen 0:3b00827bb0b7 541 udphdr->dest = htons(dst_port);
AdamGreen 0:3b00827bb0b7 542 /* in UDP, 0 checksum means 'no checksum' */
AdamGreen 0:3b00827bb0b7 543 udphdr->chksum = 0x0000;
AdamGreen 0:3b00827bb0b7 544
AdamGreen 0:3b00827bb0b7 545 /* Multicast Loop? */
AdamGreen 0:3b00827bb0b7 546 #if LWIP_IGMP
AdamGreen 0:3b00827bb0b7 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
AdamGreen 0:3b00827bb0b7 548 q->flags |= PBUF_FLAG_MCASTLOOP;
AdamGreen 0:3b00827bb0b7 549 }
AdamGreen 0:3b00827bb0b7 550 #endif /* LWIP_IGMP */
AdamGreen 0:3b00827bb0b7 551
AdamGreen 0:3b00827bb0b7 552
AdamGreen 0:3b00827bb0b7 553 /* PCB local address is IP_ANY_ADDR? */
AdamGreen 0:3b00827bb0b7 554 if (ip_addr_isany(&pcb->local_ip)) {
AdamGreen 0:3b00827bb0b7 555 /* use outgoing network interface IP address as source address */
AdamGreen 0:3b00827bb0b7 556 src_ip = &(netif->ip_addr);
AdamGreen 0:3b00827bb0b7 557 } else {
AdamGreen 0:3b00827bb0b7 558 /* check if UDP PCB local IP address is correct
AdamGreen 0:3b00827bb0b7 559 * this could be an old address if netif->ip_addr has changed */
AdamGreen 0:3b00827bb0b7 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
AdamGreen 0:3b00827bb0b7 561 /* local_ip doesn't match, drop the packet */
AdamGreen 0:3b00827bb0b7 562 if (q != p) {
AdamGreen 0:3b00827bb0b7 563 /* free the header pbuf */
AdamGreen 0:3b00827bb0b7 564 pbuf_free(q);
AdamGreen 0:3b00827bb0b7 565 q = NULL;
AdamGreen 0:3b00827bb0b7 566 /* p is still referenced by the caller, and will live on */
AdamGreen 0:3b00827bb0b7 567 }
AdamGreen 0:3b00827bb0b7 568 return ERR_VAL;
AdamGreen 0:3b00827bb0b7 569 }
AdamGreen 0:3b00827bb0b7 570 /* use UDP PCB local IP address as source address */
AdamGreen 0:3b00827bb0b7 571 src_ip = &(pcb->local_ip);
AdamGreen 0:3b00827bb0b7 572 }
AdamGreen 0:3b00827bb0b7 573
AdamGreen 0:3b00827bb0b7 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
AdamGreen 0:3b00827bb0b7 575
AdamGreen 0:3b00827bb0b7 576 #if LWIP_UDPLITE
AdamGreen 0:3b00827bb0b7 577 /* UDP Lite protocol? */
AdamGreen 0:3b00827bb0b7 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
AdamGreen 0:3b00827bb0b7 579 u16_t chklen, chklen_hdr;
AdamGreen 0:3b00827bb0b7 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
AdamGreen 0:3b00827bb0b7 581 /* set UDP message length in UDP header */
AdamGreen 0:3b00827bb0b7 582 chklen_hdr = chklen = pcb->chksum_len_tx;
AdamGreen 0:3b00827bb0b7 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
AdamGreen 0:3b00827bb0b7 584 if (chklen != 0) {
AdamGreen 0:3b00827bb0b7 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
AdamGreen 0:3b00827bb0b7 586 }
AdamGreen 0:3b00827bb0b7 587 /* For UDP-Lite, checksum length of 0 means checksum
AdamGreen 0:3b00827bb0b7 588 over the complete packet. (See RFC 3828 chap. 3.1)
AdamGreen 0:3b00827bb0b7 589 At least the UDP-Lite header must be covered by the
AdamGreen 0:3b00827bb0b7 590 checksum, therefore, if chksum_len has an illegal
AdamGreen 0:3b00827bb0b7 591 value, we generate the checksum over the complete
AdamGreen 0:3b00827bb0b7 592 packet to be safe. */
AdamGreen 0:3b00827bb0b7 593 chklen_hdr = 0;
AdamGreen 0:3b00827bb0b7 594 chklen = q->tot_len;
AdamGreen 0:3b00827bb0b7 595 }
AdamGreen 0:3b00827bb0b7 596 udphdr->len = htons(chklen_hdr);
AdamGreen 0:3b00827bb0b7 597 /* calculate checksum */
AdamGreen 0:3b00827bb0b7 598 #if CHECKSUM_GEN_UDP
AdamGreen 0:3b00827bb0b7 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
AdamGreen 0:3b00827bb0b7 600 IP_PROTO_UDPLITE, q->tot_len,
AdamGreen 0:3b00827bb0b7 601 #if !LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 602 chklen);
AdamGreen 0:3b00827bb0b7 603 #else /* !LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 604 (have_chksum ? UDP_HLEN : chklen));
AdamGreen 0:3b00827bb0b7 605 if (have_chksum) {
AdamGreen 0:3b00827bb0b7 606 u32_t acc;
AdamGreen 0:3b00827bb0b7 607 acc = udphdr->chksum + (u16_t)~(chksum);
AdamGreen 0:3b00827bb0b7 608 udphdr->chksum = FOLD_U32T(acc);
AdamGreen 0:3b00827bb0b7 609 }
AdamGreen 0:3b00827bb0b7 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 611
AdamGreen 0:3b00827bb0b7 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
AdamGreen 0:3b00827bb0b7 613 if (udphdr->chksum == 0x0000) {
AdamGreen 0:3b00827bb0b7 614 udphdr->chksum = 0xffff;
AdamGreen 0:3b00827bb0b7 615 }
AdamGreen 0:3b00827bb0b7 616 #endif /* CHECKSUM_GEN_UDP */
AdamGreen 0:3b00827bb0b7 617 /* output to IP */
AdamGreen 0:3b00827bb0b7 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
AdamGreen 0:3b00827bb0b7 619 #if LWIP_NETIF_HWADDRHINT
AdamGreen 0:3b00827bb0b7 620 netif->addr_hint = &(pcb->addr_hint);
AdamGreen 0:3b00827bb0b7 621 #endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen 0:3b00827bb0b7 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
AdamGreen 0:3b00827bb0b7 623 #if LWIP_NETIF_HWADDRHINT
AdamGreen 0:3b00827bb0b7 624 netif->addr_hint = NULL;
AdamGreen 0:3b00827bb0b7 625 #endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen 0:3b00827bb0b7 626 } else
AdamGreen 0:3b00827bb0b7 627 #endif /* LWIP_UDPLITE */
AdamGreen 0:3b00827bb0b7 628 { /* UDP */
AdamGreen 0:3b00827bb0b7 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
AdamGreen 0:3b00827bb0b7 630 udphdr->len = htons(q->tot_len);
AdamGreen 0:3b00827bb0b7 631 /* calculate checksum */
AdamGreen 0:3b00827bb0b7 632 #if CHECKSUM_GEN_UDP
AdamGreen 0:3b00827bb0b7 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
AdamGreen 0:3b00827bb0b7 634 u16_t udpchksum;
AdamGreen 0:3b00827bb0b7 635 #if LWIP_CHECKSUM_ON_COPY
AdamGreen 0:3b00827bb0b7 636 if (have_chksum) {
AdamGreen 0:3b00827bb0b7 637 u32_t acc;
AdamGreen 0:3b00827bb0b7 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
AdamGreen 0:3b00827bb0b7 639 q->tot_len, UDP_HLEN);
AdamGreen 0:3b00827bb0b7 640 acc = udpchksum + (u16_t)~(chksum);
AdamGreen 0:3b00827bb0b7 641 udpchksum = FOLD_U32T(acc);
AdamGreen 0:3b00827bb0b7 642 } else
AdamGreen 0:3b00827bb0b7 643 #endif /* LWIP_CHECKSUM_ON_COPY */
AdamGreen 0:3b00827bb0b7 644 {
AdamGreen 0:3b00827bb0b7 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
AdamGreen 0:3b00827bb0b7 646 }
AdamGreen 0:3b00827bb0b7 647
AdamGreen 0:3b00827bb0b7 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
AdamGreen 0:3b00827bb0b7 649 if (udpchksum == 0x0000) {
AdamGreen 0:3b00827bb0b7 650 udpchksum = 0xffff;
AdamGreen 0:3b00827bb0b7 651 }
AdamGreen 0:3b00827bb0b7 652 udphdr->chksum = udpchksum;
AdamGreen 0:3b00827bb0b7 653 }
AdamGreen 0:3b00827bb0b7 654 #endif /* CHECKSUM_GEN_UDP */
AdamGreen 0:3b00827bb0b7 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
AdamGreen 0:3b00827bb0b7 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
AdamGreen 0:3b00827bb0b7 657 /* output to IP */
AdamGreen 0:3b00827bb0b7 658 #if LWIP_NETIF_HWADDRHINT
AdamGreen 0:3b00827bb0b7 659 netif->addr_hint = &(pcb->addr_hint);
AdamGreen 0:3b00827bb0b7 660 #endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen 0:3b00827bb0b7 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
AdamGreen 0:3b00827bb0b7 662 #if LWIP_NETIF_HWADDRHINT
AdamGreen 0:3b00827bb0b7 663 netif->addr_hint = NULL;
AdamGreen 0:3b00827bb0b7 664 #endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen 0:3b00827bb0b7 665 }
AdamGreen 0:3b00827bb0b7 666 /* TODO: must this be increased even if error occured? */
AdamGreen 0:3b00827bb0b7 667 snmp_inc_udpoutdatagrams();
AdamGreen 0:3b00827bb0b7 668
AdamGreen 0:3b00827bb0b7 669 /* did we chain a separate header pbuf earlier? */
AdamGreen 0:3b00827bb0b7 670 if (q != p) {
AdamGreen 0:3b00827bb0b7 671 /* free the header pbuf */
AdamGreen 0:3b00827bb0b7 672 pbuf_free(q);
AdamGreen 0:3b00827bb0b7 673 q = NULL;
AdamGreen 0:3b00827bb0b7 674 /* p is still referenced by the caller, and will live on */
AdamGreen 0:3b00827bb0b7 675 }
AdamGreen 0:3b00827bb0b7 676
AdamGreen 0:3b00827bb0b7 677 UDP_STATS_INC(udp.xmit);
AdamGreen 0:3b00827bb0b7 678 return err;
AdamGreen 0:3b00827bb0b7 679 }
AdamGreen 0:3b00827bb0b7 680
AdamGreen 0:3b00827bb0b7 681 /**
AdamGreen 0:3b00827bb0b7 682 * Bind an UDP PCB.
AdamGreen 0:3b00827bb0b7 683 *
AdamGreen 0:3b00827bb0b7 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
AdamGreen 0:3b00827bb0b7 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
AdamGreen 0:3b00827bb0b7 686 * bind to all local interfaces.
AdamGreen 0:3b00827bb0b7 687 * @param port local UDP port to bind with. Use 0 to automatically bind
AdamGreen 0:3b00827bb0b7 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
AdamGreen 0:3b00827bb0b7 689 * UDP_LOCAL_PORT_RANGE_END.
AdamGreen 0:3b00827bb0b7 690 *
AdamGreen 0:3b00827bb0b7 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
AdamGreen 0:3b00827bb0b7 692 *
AdamGreen 0:3b00827bb0b7 693 * @return lwIP error code.
AdamGreen 0:3b00827bb0b7 694 * - ERR_OK. Successful. No error occured.
AdamGreen 0:3b00827bb0b7 695 * - ERR_USE. The specified ipaddr and port are already bound to by
AdamGreen 0:3b00827bb0b7 696 * another UDP PCB.
AdamGreen 0:3b00827bb0b7 697 *
AdamGreen 0:3b00827bb0b7 698 * @see udp_disconnect()
AdamGreen 0:3b00827bb0b7 699 */
AdamGreen 0:3b00827bb0b7 700 err_t
AdamGreen 0:3b00827bb0b7 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
AdamGreen 0:3b00827bb0b7 702 {
AdamGreen 0:3b00827bb0b7 703 struct udp_pcb *ipcb;
AdamGreen 0:3b00827bb0b7 704 u8_t rebind;
AdamGreen 0:3b00827bb0b7 705
AdamGreen 0:3b00827bb0b7 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
AdamGreen 0:3b00827bb0b7 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
AdamGreen 0:3b00827bb0b7 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
AdamGreen 0:3b00827bb0b7 709
AdamGreen 0:3b00827bb0b7 710 rebind = 0;
AdamGreen 0:3b00827bb0b7 711 /* Check for double bind and rebind of the same pcb */
AdamGreen 0:3b00827bb0b7 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
AdamGreen 0:3b00827bb0b7 713 /* is this UDP PCB already on active list? */
AdamGreen 0:3b00827bb0b7 714 if (pcb == ipcb) {
AdamGreen 0:3b00827bb0b7 715 /* pcb may occur at most once in active list */
AdamGreen 0:3b00827bb0b7 716 LWIP_ASSERT("rebind == 0", rebind == 0);
AdamGreen 0:3b00827bb0b7 717 /* pcb already in list, just rebind */
AdamGreen 0:3b00827bb0b7 718 rebind = 1;
AdamGreen 0:3b00827bb0b7 719 }
AdamGreen 0:3b00827bb0b7 720
AdamGreen 0:3b00827bb0b7 721 /* By default, we don't allow to bind to a port that any other udp
AdamGreen 0:3b00827bb0b7 722 PCB is alread bound to, unless *all* PCBs with that port have tha
AdamGreen 0:3b00827bb0b7 723 REUSEADDR flag set. */
AdamGreen 0:3b00827bb0b7 724 #if SO_REUSE
AdamGreen 0:3b00827bb0b7 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
AdamGreen 0:3b00827bb0b7 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
AdamGreen 0:3b00827bb0b7 727 #else /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
AdamGreen 0:3b00827bb0b7 729 else {
AdamGreen 0:3b00827bb0b7 730 #endif /* SO_REUSE */
AdamGreen 0:3b00827bb0b7 731 if ((ipcb->local_port == port) &&
AdamGreen 0:3b00827bb0b7 732 /* IP address matches, or one is IP_ADDR_ANY? */
AdamGreen 0:3b00827bb0b7 733 (ip_addr_isany(&(ipcb->local_ip)) ||
AdamGreen 0:3b00827bb0b7 734 ip_addr_isany(ipaddr) ||
AdamGreen 0:3b00827bb0b7 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
AdamGreen 0:3b00827bb0b7 736 /* other PCB already binds to this local IP and port */
AdamGreen 0:3b00827bb0b7 737 LWIP_DEBUGF(UDP_DEBUG,
AdamGreen 0:3b00827bb0b7 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
AdamGreen 0:3b00827bb0b7 739 return ERR_USE;
AdamGreen 0:3b00827bb0b7 740 }
AdamGreen 0:3b00827bb0b7 741 }
AdamGreen 0:3b00827bb0b7 742 }
AdamGreen 0:3b00827bb0b7 743
AdamGreen 0:3b00827bb0b7 744 ip_addr_set(&pcb->local_ip, ipaddr);
AdamGreen 0:3b00827bb0b7 745
AdamGreen 0:3b00827bb0b7 746 /* no port specified? */
AdamGreen 0:3b00827bb0b7 747 if (port == 0) {
AdamGreen 0:3b00827bb0b7 748 #ifndef UDP_LOCAL_PORT_RANGE_START
AdamGreen 0:3b00827bb0b7 749 /* From http://www.iana.org/assignments/port-numbers:
AdamGreen 0:3b00827bb0b7 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
AdamGreen 0:3b00827bb0b7 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
AdamGreen 0:3b00827bb0b7 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
AdamGreen 0:3b00827bb0b7 753 #endif
AdamGreen 0:3b00827bb0b7 754 port = UDP_LOCAL_PORT_RANGE_START;
AdamGreen 0:3b00827bb0b7 755 ipcb = udp_pcbs;
AdamGreen 0:3b00827bb0b7 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
AdamGreen 0:3b00827bb0b7 757 if (ipcb->local_port == port) {
AdamGreen 0:3b00827bb0b7 758 /* port is already used by another udp_pcb */
AdamGreen 0:3b00827bb0b7 759 port++;
AdamGreen 0:3b00827bb0b7 760 /* restart scanning all udp pcbs */
AdamGreen 0:3b00827bb0b7 761 ipcb = udp_pcbs;
AdamGreen 0:3b00827bb0b7 762 } else {
AdamGreen 0:3b00827bb0b7 763 /* go on with next udp pcb */
AdamGreen 0:3b00827bb0b7 764 ipcb = ipcb->next;
AdamGreen 0:3b00827bb0b7 765 }
AdamGreen 0:3b00827bb0b7 766 }
AdamGreen 0:3b00827bb0b7 767 if (ipcb != NULL) {
AdamGreen 0:3b00827bb0b7 768 /* no more ports available in local range */
AdamGreen 0:3b00827bb0b7 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
AdamGreen 0:3b00827bb0b7 770 return ERR_USE;
AdamGreen 0:3b00827bb0b7 771 }
AdamGreen 0:3b00827bb0b7 772 }
AdamGreen 0:3b00827bb0b7 773 pcb->local_port = port;
AdamGreen 0:3b00827bb0b7 774 snmp_insert_udpidx_tree(pcb);
AdamGreen 0:3b00827bb0b7 775 /* pcb not active yet? */
AdamGreen 0:3b00827bb0b7 776 if (rebind == 0) {
AdamGreen 0:3b00827bb0b7 777 /* place the PCB on the active list if not already there */
AdamGreen 0:3b00827bb0b7 778 pcb->next = udp_pcbs;
AdamGreen 0:3b00827bb0b7 779 udp_pcbs = pcb;
AdamGreen 0:3b00827bb0b7 780 }
AdamGreen 0:3b00827bb0b7 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
AdamGreen 0:3b00827bb0b7 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
AdamGreen 0:3b00827bb0b7 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
AdamGreen 0:3b00827bb0b7 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
AdamGreen 0:3b00827bb0b7 785 pcb->local_port));
AdamGreen 0:3b00827bb0b7 786 return ERR_OK;
AdamGreen 0:3b00827bb0b7 787 }
AdamGreen 0:3b00827bb0b7 788 /**
AdamGreen 0:3b00827bb0b7 789 * Connect an UDP PCB.
AdamGreen 0:3b00827bb0b7 790 *
AdamGreen 0:3b00827bb0b7 791 * This will associate the UDP PCB with the remote address.
AdamGreen 0:3b00827bb0b7 792 *
AdamGreen 0:3b00827bb0b7 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
AdamGreen 0:3b00827bb0b7 794 * @param ipaddr remote IP address to connect with.
AdamGreen 0:3b00827bb0b7 795 * @param port remote UDP port to connect with.
AdamGreen 0:3b00827bb0b7 796 *
AdamGreen 0:3b00827bb0b7 797 * @return lwIP error code
AdamGreen 0:3b00827bb0b7 798 *
AdamGreen 0:3b00827bb0b7 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
AdamGreen 0:3b00827bb0b7 800 *
AdamGreen 0:3b00827bb0b7 801 * The udp pcb is bound to a random local port if not already bound.
AdamGreen 0:3b00827bb0b7 802 *
AdamGreen 0:3b00827bb0b7 803 * @see udp_disconnect()
AdamGreen 0:3b00827bb0b7 804 */
AdamGreen 0:3b00827bb0b7 805 err_t
AdamGreen 0:3b00827bb0b7 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
AdamGreen 0:3b00827bb0b7 807 {
AdamGreen 0:3b00827bb0b7 808 struct udp_pcb *ipcb;
AdamGreen 0:3b00827bb0b7 809
AdamGreen 0:3b00827bb0b7 810 if (pcb->local_port == 0) {
AdamGreen 0:3b00827bb0b7 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
AdamGreen 0:3b00827bb0b7 812 if (err != ERR_OK) {
AdamGreen 0:3b00827bb0b7 813 return err;
AdamGreen 0:3b00827bb0b7 814 }
AdamGreen 0:3b00827bb0b7 815 }
AdamGreen 0:3b00827bb0b7 816
AdamGreen 0:3b00827bb0b7 817 ip_addr_set(&pcb->remote_ip, ipaddr);
AdamGreen 0:3b00827bb0b7 818 pcb->remote_port = port;
AdamGreen 0:3b00827bb0b7 819 pcb->flags |= UDP_FLAGS_CONNECTED;
AdamGreen 0:3b00827bb0b7 820 /** TODO: this functionality belongs in upper layers */
AdamGreen 0:3b00827bb0b7 821 #ifdef LWIP_UDP_TODO
AdamGreen 0:3b00827bb0b7 822 /* Nail down local IP for netconn_addr()/getsockname() */
AdamGreen 0:3b00827bb0b7 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
AdamGreen 0:3b00827bb0b7 824 struct netif *netif;
AdamGreen 0:3b00827bb0b7 825
AdamGreen 0:3b00827bb0b7 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
AdamGreen 0:3b00827bb0b7 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
AdamGreen 0:3b00827bb0b7 828 UDP_STATS_INC(udp.rterr);
AdamGreen 0:3b00827bb0b7 829 return ERR_RTE;
AdamGreen 0:3b00827bb0b7 830 }
AdamGreen 0:3b00827bb0b7 831 /** TODO: this will bind the udp pcb locally, to the interface which
AdamGreen 0:3b00827bb0b7 832 is used to route output packets to the remote address. However, we
AdamGreen 0:3b00827bb0b7 833 might want to accept incoming packets on any interface! */
AdamGreen 0:3b00827bb0b7 834 pcb->local_ip = netif->ip_addr;
AdamGreen 0:3b00827bb0b7 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
AdamGreen 0:3b00827bb0b7 836 pcb->local_ip.addr = 0;
AdamGreen 0:3b00827bb0b7 837 }
AdamGreen 0:3b00827bb0b7 838 #endif
AdamGreen 0:3b00827bb0b7 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
AdamGreen 0:3b00827bb0b7 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
AdamGreen 0:3b00827bb0b7 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
AdamGreen 0:3b00827bb0b7 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
AdamGreen 0:3b00827bb0b7 843 pcb->local_port));
AdamGreen 0:3b00827bb0b7 844
AdamGreen 0:3b00827bb0b7 845 /* Insert UDP PCB into the list of active UDP PCBs. */
AdamGreen 0:3b00827bb0b7 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
AdamGreen 0:3b00827bb0b7 847 if (pcb == ipcb) {
AdamGreen 0:3b00827bb0b7 848 /* already on the list, just return */
AdamGreen 0:3b00827bb0b7 849 return ERR_OK;
AdamGreen 0:3b00827bb0b7 850 }
AdamGreen 0:3b00827bb0b7 851 }
AdamGreen 0:3b00827bb0b7 852 /* PCB not yet on the list, add PCB now */
AdamGreen 0:3b00827bb0b7 853 pcb->next = udp_pcbs;
AdamGreen 0:3b00827bb0b7 854 udp_pcbs = pcb;
AdamGreen 0:3b00827bb0b7 855 return ERR_OK;
AdamGreen 0:3b00827bb0b7 856 }
AdamGreen 0:3b00827bb0b7 857
AdamGreen 0:3b00827bb0b7 858 /**
AdamGreen 0:3b00827bb0b7 859 * Disconnect a UDP PCB
AdamGreen 0:3b00827bb0b7 860 *
AdamGreen 0:3b00827bb0b7 861 * @param pcb the udp pcb to disconnect.
AdamGreen 0:3b00827bb0b7 862 */
AdamGreen 0:3b00827bb0b7 863 void
AdamGreen 0:3b00827bb0b7 864 udp_disconnect(struct udp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 865 {
AdamGreen 0:3b00827bb0b7 866 /* reset remote address association */
AdamGreen 0:3b00827bb0b7 867 ip_addr_set_any(&pcb->remote_ip);
AdamGreen 0:3b00827bb0b7 868 pcb->remote_port = 0;
AdamGreen 0:3b00827bb0b7 869 /* mark PCB as unconnected */
AdamGreen 0:3b00827bb0b7 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
AdamGreen 0:3b00827bb0b7 871 }
AdamGreen 0:3b00827bb0b7 872
AdamGreen 0:3b00827bb0b7 873 /**
AdamGreen 0:3b00827bb0b7 874 * Set a receive callback for a UDP PCB
AdamGreen 0:3b00827bb0b7 875 *
AdamGreen 0:3b00827bb0b7 876 * This callback will be called when receiving a datagram for the pcb.
AdamGreen 0:3b00827bb0b7 877 *
AdamGreen 0:3b00827bb0b7 878 * @param pcb the pcb for wich to set the recv callback
AdamGreen 0:3b00827bb0b7 879 * @param recv function pointer of the callback function
AdamGreen 0:3b00827bb0b7 880 * @param recv_arg additional argument to pass to the callback function
AdamGreen 0:3b00827bb0b7 881 */
AdamGreen 0:3b00827bb0b7 882 void
AdamGreen 0:3b00827bb0b7 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
AdamGreen 0:3b00827bb0b7 884 {
AdamGreen 0:3b00827bb0b7 885 /* remember recv() callback and user data */
AdamGreen 0:3b00827bb0b7 886 pcb->recv = recv;
AdamGreen 0:3b00827bb0b7 887 pcb->recv_arg = recv_arg;
AdamGreen 0:3b00827bb0b7 888 }
AdamGreen 0:3b00827bb0b7 889
AdamGreen 0:3b00827bb0b7 890 /**
AdamGreen 0:3b00827bb0b7 891 * Remove an UDP PCB.
AdamGreen 0:3b00827bb0b7 892 *
AdamGreen 0:3b00827bb0b7 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
AdamGreen 0:3b00827bb0b7 894 * UDP PCB's and the data structure is freed from memory.
AdamGreen 0:3b00827bb0b7 895 *
AdamGreen 0:3b00827bb0b7 896 * @see udp_new()
AdamGreen 0:3b00827bb0b7 897 */
AdamGreen 0:3b00827bb0b7 898 void
AdamGreen 0:3b00827bb0b7 899 udp_remove(struct udp_pcb *pcb)
AdamGreen 0:3b00827bb0b7 900 {
AdamGreen 0:3b00827bb0b7 901 struct udp_pcb *pcb2;
AdamGreen 0:3b00827bb0b7 902
AdamGreen 0:3b00827bb0b7 903 snmp_delete_udpidx_tree(pcb);
AdamGreen 0:3b00827bb0b7 904 /* pcb to be removed is first in list? */
AdamGreen 0:3b00827bb0b7 905 if (udp_pcbs == pcb) {
AdamGreen 0:3b00827bb0b7 906 /* make list start at 2nd pcb */
AdamGreen 0:3b00827bb0b7 907 udp_pcbs = udp_pcbs->next;
AdamGreen 0:3b00827bb0b7 908 /* pcb not 1st in list */
AdamGreen 0:3b00827bb0b7 909 } else {
AdamGreen 0:3b00827bb0b7 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
AdamGreen 0:3b00827bb0b7 911 /* find pcb in udp_pcbs list */
AdamGreen 0:3b00827bb0b7 912 if (pcb2->next != NULL && pcb2->next == pcb) {
AdamGreen 0:3b00827bb0b7 913 /* remove pcb from list */
AdamGreen 0:3b00827bb0b7 914 pcb2->next = pcb->next;
AdamGreen 0:3b00827bb0b7 915 }
AdamGreen 0:3b00827bb0b7 916 }
AdamGreen 0:3b00827bb0b7 917 }
AdamGreen 0:3b00827bb0b7 918 memp_free(MEMP_UDP_PCB, pcb);
AdamGreen 0:3b00827bb0b7 919 }
AdamGreen 0:3b00827bb0b7 920
AdamGreen 0:3b00827bb0b7 921 /**
AdamGreen 0:3b00827bb0b7 922 * Create a UDP PCB.
AdamGreen 0:3b00827bb0b7 923 *
AdamGreen 0:3b00827bb0b7 924 * @return The UDP PCB which was created. NULL if the PCB data structure
AdamGreen 0:3b00827bb0b7 925 * could not be allocated.
AdamGreen 0:3b00827bb0b7 926 *
AdamGreen 0:3b00827bb0b7 927 * @see udp_remove()
AdamGreen 0:3b00827bb0b7 928 */
AdamGreen 0:3b00827bb0b7 929 struct udp_pcb *
AdamGreen 0:3b00827bb0b7 930 udp_new(void)
AdamGreen 0:3b00827bb0b7 931 {
AdamGreen 0:3b00827bb0b7 932 struct udp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
AdamGreen 0:3b00827bb0b7 934 /* could allocate UDP PCB? */
AdamGreen 0:3b00827bb0b7 935 if (pcb != NULL) {
AdamGreen 0:3b00827bb0b7 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
AdamGreen 0:3b00827bb0b7 937 * which means checksum is generated over the whole datagram per default
AdamGreen 0:3b00827bb0b7 938 * (recommended as default by RFC 3828). */
AdamGreen 0:3b00827bb0b7 939 /* initialize PCB to all zeroes */
AdamGreen 0:3b00827bb0b7 940 memset(pcb, 0, sizeof(struct udp_pcb));
AdamGreen 0:3b00827bb0b7 941 pcb->ttl = UDP_TTL;
AdamGreen 0:3b00827bb0b7 942 }
AdamGreen 0:3b00827bb0b7 943 return pcb;
AdamGreen 0:3b00827bb0b7 944 }
AdamGreen 0:3b00827bb0b7 945
AdamGreen 0:3b00827bb0b7 946 #if UDP_DEBUG
AdamGreen 0:3b00827bb0b7 947 /**
AdamGreen 0:3b00827bb0b7 948 * Print UDP header information for debug purposes.
AdamGreen 0:3b00827bb0b7 949 *
AdamGreen 0:3b00827bb0b7 950 * @param udphdr pointer to the udp header in memory.
AdamGreen 0:3b00827bb0b7 951 */
AdamGreen 0:3b00827bb0b7 952 void
AdamGreen 0:3b00827bb0b7 953 udp_debug_print(struct udp_hdr *udphdr)
AdamGreen 0:3b00827bb0b7 954 {
AdamGreen 0:3b00827bb0b7 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
AdamGreen 0:3b00827bb0b7 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
AdamGreen 0:3b00827bb0b7 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
AdamGreen 0:3b00827bb0b7 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
AdamGreen 0:3b00827bb0b7 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
AdamGreen 0:3b00827bb0b7 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
AdamGreen 0:3b00827bb0b7 963 }
AdamGreen 0:3b00827bb0b7 964 #endif /* UDP_DEBUG */
AdamGreen 0:3b00827bb0b7 965
AdamGreen 0:3b00827bb0b7 966 #endif /* LWIP_UDP */