Pehr Hovey
Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
Core/lwIP/core/udp.c@0:a548a085de55, 2010-03-14 (annotated)
- Committer:
- pehrhovey
- Date:
- Sun Mar 14 00:54:12 2010 +0000
- Revision:
- 0:a548a085de55
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pehrhovey | 0:a548a085de55 | 1 | /** |
| pehrhovey | 0:a548a085de55 | 2 | * @file |
| pehrhovey | 0:a548a085de55 | 3 | * User Datagram Protocol module |
| pehrhovey | 0:a548a085de55 | 4 | * |
| pehrhovey | 0:a548a085de55 | 5 | */ |
| pehrhovey | 0:a548a085de55 | 6 | |
| pehrhovey | 0:a548a085de55 | 7 | /* |
| pehrhovey | 0:a548a085de55 | 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| pehrhovey | 0:a548a085de55 | 9 | * All rights reserved. |
| pehrhovey | 0:a548a085de55 | 10 | * |
| pehrhovey | 0:a548a085de55 | 11 | * Redistribution and use in source and binary forms, with or without modification, |
| pehrhovey | 0:a548a085de55 | 12 | * are permitted provided that the following conditions are met: |
| pehrhovey | 0:a548a085de55 | 13 | * |
| pehrhovey | 0:a548a085de55 | 14 | * 1. Redistributions of source code must retain the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 15 | * this list of conditions and the following disclaimer. |
| pehrhovey | 0:a548a085de55 | 16 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 17 | * this list of conditions and the following disclaimer in the documentation |
| pehrhovey | 0:a548a085de55 | 18 | * and/or other materials provided with the distribution. |
| pehrhovey | 0:a548a085de55 | 19 | * 3. The name of the author may not be used to endorse or promote products |
| pehrhovey | 0:a548a085de55 | 20 | * derived from this software without specific prior written permission. |
| pehrhovey | 0:a548a085de55 | 21 | * |
| pehrhovey | 0:a548a085de55 | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| pehrhovey | 0:a548a085de55 | 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| pehrhovey | 0:a548a085de55 | 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| pehrhovey | 0:a548a085de55 | 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| pehrhovey | 0:a548a085de55 | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| pehrhovey | 0:a548a085de55 | 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| pehrhovey | 0:a548a085de55 | 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| pehrhovey | 0:a548a085de55 | 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| pehrhovey | 0:a548a085de55 | 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| pehrhovey | 0:a548a085de55 | 31 | * OF SUCH DAMAGE. |
| pehrhovey | 0:a548a085de55 | 32 | * |
| pehrhovey | 0:a548a085de55 | 33 | * This file is part of the lwIP TCP/IP stack. |
| pehrhovey | 0:a548a085de55 | 34 | * |
| pehrhovey | 0:a548a085de55 | 35 | * Author: Adam Dunkels <adam@sics.se> |
| pehrhovey | 0:a548a085de55 | 36 | * |
| pehrhovey | 0:a548a085de55 | 37 | */ |
| pehrhovey | 0:a548a085de55 | 38 | |
| pehrhovey | 0:a548a085de55 | 39 | |
| pehrhovey | 0:a548a085de55 | 40 | /* udp.c |
| pehrhovey | 0:a548a085de55 | 41 | * |
| pehrhovey | 0:a548a085de55 | 42 | * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828). |
| pehrhovey | 0:a548a085de55 | 43 | * |
| pehrhovey | 0:a548a085de55 | 44 | */ |
| pehrhovey | 0:a548a085de55 | 45 | |
| pehrhovey | 0:a548a085de55 | 46 | /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'! |
| pehrhovey | 0:a548a085de55 | 47 | */ |
| pehrhovey | 0:a548a085de55 | 48 | |
| pehrhovey | 0:a548a085de55 | 49 | #include "lwip/opt.h" |
| pehrhovey | 0:a548a085de55 | 50 | |
| pehrhovey | 0:a548a085de55 | 51 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */ |
| pehrhovey | 0:a548a085de55 | 52 | |
| pehrhovey | 0:a548a085de55 | 53 | #include "lwip/udp.h" |
| pehrhovey | 0:a548a085de55 | 54 | #include "lwip/def.h" |
| pehrhovey | 0:a548a085de55 | 55 | #include "lwip/memp.h" |
| pehrhovey | 0:a548a085de55 | 56 | #include "lwip/inet.h" |
| pehrhovey | 0:a548a085de55 | 57 | #include "lwip/inet_chksum.h" |
| pehrhovey | 0:a548a085de55 | 58 | #include "lwip/ip_addr.h" |
| pehrhovey | 0:a548a085de55 | 59 | #include "lwip/netif.h" |
| pehrhovey | 0:a548a085de55 | 60 | #include "lwip/icmp.h" |
| pehrhovey | 0:a548a085de55 | 61 | #include "lwip/stats.h" |
| pehrhovey | 0:a548a085de55 | 62 | #include "lwip/snmp.h" |
| pehrhovey | 0:a548a085de55 | 63 | #include "arch/perf.h" |
| pehrhovey | 0:a548a085de55 | 64 | #include "lwip/dhcp.h" |
| pehrhovey | 0:a548a085de55 | 65 | |
| pehrhovey | 0:a548a085de55 | 66 | #include <string.h> |
| pehrhovey | 0:a548a085de55 | 67 | |
| pehrhovey | 0:a548a085de55 | 68 | /* The list of UDP PCBs */ |
| pehrhovey | 0:a548a085de55 | 69 | /* exported in udp.h (was static) */ |
| pehrhovey | 0:a548a085de55 | 70 | struct udp_pcb *udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 71 | |
| pehrhovey | 0:a548a085de55 | 72 | /** |
| pehrhovey | 0:a548a085de55 | 73 | * Process an incoming UDP datagram. |
| pehrhovey | 0:a548a085de55 | 74 | * |
| pehrhovey | 0:a548a085de55 | 75 | * Given an incoming UDP datagram (as a chain of pbufs) this function |
| pehrhovey | 0:a548a085de55 | 76 | * finds a corresponding UDP PCB and hands over the pbuf to the pcbs |
| pehrhovey | 0:a548a085de55 | 77 | * recv function. If no pcb is found or the datagram is incorrect, the |
| pehrhovey | 0:a548a085de55 | 78 | * pbuf is freed. |
| pehrhovey | 0:a548a085de55 | 79 | * |
| pehrhovey | 0:a548a085de55 | 80 | * @param p pbuf to be demultiplexed to a UDP PCB. |
| pehrhovey | 0:a548a085de55 | 81 | * @param inp network interface on which the datagram was received. |
| pehrhovey | 0:a548a085de55 | 82 | * |
| pehrhovey | 0:a548a085de55 | 83 | */ |
| pehrhovey | 0:a548a085de55 | 84 | void |
| pehrhovey | 0:a548a085de55 | 85 | udp_input(struct pbuf *p, struct netif *inp) |
| pehrhovey | 0:a548a085de55 | 86 | { |
| pehrhovey | 0:a548a085de55 | 87 | struct udp_hdr *udphdr; |
| pehrhovey | 0:a548a085de55 | 88 | struct udp_pcb *pcb, *prev; |
| pehrhovey | 0:a548a085de55 | 89 | struct udp_pcb *uncon_pcb; |
| pehrhovey | 0:a548a085de55 | 90 | struct ip_hdr *iphdr; |
| pehrhovey | 0:a548a085de55 | 91 | u16_t src, dest; |
| pehrhovey | 0:a548a085de55 | 92 | u8_t local_match; |
| pehrhovey | 0:a548a085de55 | 93 | u8_t broadcast; |
| pehrhovey | 0:a548a085de55 | 94 | |
| pehrhovey | 0:a548a085de55 | 95 | PERF_START; |
| pehrhovey | 0:a548a085de55 | 96 | |
| pehrhovey | 0:a548a085de55 | 97 | UDP_STATS_INC(udp.recv); |
| pehrhovey | 0:a548a085de55 | 98 | |
| pehrhovey | 0:a548a085de55 | 99 | iphdr = (struct ip_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 100 | |
| pehrhovey | 0:a548a085de55 | 101 | /* Check minimum length (IP header + UDP header) |
| pehrhovey | 0:a548a085de55 | 102 | * and move payload pointer to UDP header */ |
| pehrhovey | 0:a548a085de55 | 103 | if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) { |
| pehrhovey | 0:a548a085de55 | 104 | /* drop short packets */ |
| pehrhovey | 0:a548a085de55 | 105 | LWIP_DEBUGF(UDP_DEBUG, |
| pehrhovey | 0:a548a085de55 | 106 | ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len)); |
| pehrhovey | 0:a548a085de55 | 107 | UDP_STATS_INC(udp.lenerr); |
| pehrhovey | 0:a548a085de55 | 108 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 109 | snmp_inc_udpinerrors(); |
| pehrhovey | 0:a548a085de55 | 110 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 111 | goto end; |
| pehrhovey | 0:a548a085de55 | 112 | } |
| pehrhovey | 0:a548a085de55 | 113 | |
| pehrhovey | 0:a548a085de55 | 114 | udphdr = (struct udp_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 115 | |
| pehrhovey | 0:a548a085de55 | 116 | /* is broadcast packet ? */ |
| pehrhovey | 0:a548a085de55 | 117 | broadcast = ip_addr_isbroadcast(&(iphdr->dest), inp); |
| pehrhovey | 0:a548a085de55 | 118 | |
| pehrhovey | 0:a548a085de55 | 119 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len)); |
| pehrhovey | 0:a548a085de55 | 120 | |
| pehrhovey | 0:a548a085de55 | 121 | /* convert src and dest ports to host byte order */ |
| pehrhovey | 0:a548a085de55 | 122 | src = ntohs(udphdr->src); |
| pehrhovey | 0:a548a085de55 | 123 | dest = ntohs(udphdr->dest); |
| pehrhovey | 0:a548a085de55 | 124 | |
| pehrhovey | 0:a548a085de55 | 125 | udp_debug_print(udphdr); |
| pehrhovey | 0:a548a085de55 | 126 | |
| pehrhovey | 0:a548a085de55 | 127 | /* print the UDP source and destination */ |
| pehrhovey | 0:a548a085de55 | 128 | LWIP_DEBUGF(UDP_DEBUG, |
| pehrhovey | 0:a548a085de55 | 129 | ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- " |
| pehrhovey | 0:a548a085de55 | 130 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| pehrhovey | 0:a548a085de55 | 131 | ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 132 | ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest), ntohs(udphdr->dest), |
| pehrhovey | 0:a548a085de55 | 133 | ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src), |
| pehrhovey | 0:a548a085de55 | 134 | ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src))); |
| pehrhovey | 0:a548a085de55 | 135 | |
| pehrhovey | 0:a548a085de55 | 136 | #if LWIP_DHCP |
| pehrhovey | 0:a548a085de55 | 137 | pcb = NULL; |
| pehrhovey | 0:a548a085de55 | 138 | /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by |
| pehrhovey | 0:a548a085de55 | 139 | the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */ |
| pehrhovey | 0:a548a085de55 | 140 | if (dest == DHCP_CLIENT_PORT) { |
| pehrhovey | 0:a548a085de55 | 141 | /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */ |
| pehrhovey | 0:a548a085de55 | 142 | if (src == DHCP_SERVER_PORT) { |
| pehrhovey | 0:a548a085de55 | 143 | if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) { |
| pehrhovey | 0:a548a085de55 | 144 | /* accept the packe if |
| pehrhovey | 0:a548a085de55 | 145 | (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY! |
| pehrhovey | 0:a548a085de55 | 146 | - inp->dhcp->pcb->remote == ANY or iphdr->src */ |
| pehrhovey | 0:a548a085de55 | 147 | if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) || |
| pehrhovey | 0:a548a085de55 | 148 | ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) { |
| pehrhovey | 0:a548a085de55 | 149 | pcb = inp->dhcp->pcb; |
| pehrhovey | 0:a548a085de55 | 150 | } |
| pehrhovey | 0:a548a085de55 | 151 | } |
| pehrhovey | 0:a548a085de55 | 152 | } |
| pehrhovey | 0:a548a085de55 | 153 | } else |
| pehrhovey | 0:a548a085de55 | 154 | #endif /* LWIP_DHCP */ |
| pehrhovey | 0:a548a085de55 | 155 | { |
| pehrhovey | 0:a548a085de55 | 156 | prev = NULL; |
| pehrhovey | 0:a548a085de55 | 157 | local_match = 0; |
| pehrhovey | 0:a548a085de55 | 158 | uncon_pcb = NULL; |
| pehrhovey | 0:a548a085de55 | 159 | /* Iterate through the UDP pcb list for a matching pcb. |
| pehrhovey | 0:a548a085de55 | 160 | * 'Perfect match' pcbs (connected to the remote port & ip address) are |
| pehrhovey | 0:a548a085de55 | 161 | * preferred. If no perfect match is found, the first unconnected pcb that |
| pehrhovey | 0:a548a085de55 | 162 | * matches the local port and ip address gets the datagram. */ |
| pehrhovey | 0:a548a085de55 | 163 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { |
| pehrhovey | 0:a548a085de55 | 164 | local_match = 0; |
| pehrhovey | 0:a548a085de55 | 165 | /* print the PCB local and remote address */ |
| pehrhovey | 0:a548a085de55 | 166 | LWIP_DEBUGF(UDP_DEBUG, |
| pehrhovey | 0:a548a085de55 | 167 | ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- " |
| pehrhovey | 0:a548a085de55 | 168 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| pehrhovey | 0:a548a085de55 | 169 | ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip), |
| pehrhovey | 0:a548a085de55 | 170 | ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port, |
| pehrhovey | 0:a548a085de55 | 171 | ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip), |
| pehrhovey | 0:a548a085de55 | 172 | ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port)); |
| pehrhovey | 0:a548a085de55 | 173 | |
| pehrhovey | 0:a548a085de55 | 174 | /* compare PCB local addr+port to UDP destination addr+port */ |
| pehrhovey | 0:a548a085de55 | 175 | if ((pcb->local_port == dest) && |
| pehrhovey | 0:a548a085de55 | 176 | ((!broadcast && ip_addr_isany(&pcb->local_ip)) || |
| pehrhovey | 0:a548a085de55 | 177 | ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) || |
| pehrhovey | 0:a548a085de55 | 178 | #if LWIP_IGMP |
| pehrhovey | 0:a548a085de55 | 179 | ip_addr_ismulticast(&(iphdr->dest)) || |
| pehrhovey | 0:a548a085de55 | 180 | #endif /* LWIP_IGMP */ |
| pehrhovey | 0:a548a085de55 | 181 | #if IP_SOF_BROADCAST_RECV |
| pehrhovey | 0:a548a085de55 | 182 | (broadcast && (pcb->so_options & SOF_BROADCAST)))) { |
| pehrhovey | 0:a548a085de55 | 183 | #else /* IP_SOF_BROADCAST_RECV */ |
| pehrhovey | 0:a548a085de55 | 184 | (broadcast))) { |
| pehrhovey | 0:a548a085de55 | 185 | #endif /* IP_SOF_BROADCAST_RECV */ |
| pehrhovey | 0:a548a085de55 | 186 | local_match = 1; |
| pehrhovey | 0:a548a085de55 | 187 | if ((uncon_pcb == NULL) && |
| pehrhovey | 0:a548a085de55 | 188 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) { |
| pehrhovey | 0:a548a085de55 | 189 | /* the first unconnected matching PCB */ |
| pehrhovey | 0:a548a085de55 | 190 | uncon_pcb = pcb; |
| pehrhovey | 0:a548a085de55 | 191 | } |
| pehrhovey | 0:a548a085de55 | 192 | } |
| pehrhovey | 0:a548a085de55 | 193 | /* compare PCB remote addr+port to UDP source addr+port */ |
| pehrhovey | 0:a548a085de55 | 194 | if ((local_match != 0) && |
| pehrhovey | 0:a548a085de55 | 195 | (pcb->remote_port == src) && |
| pehrhovey | 0:a548a085de55 | 196 | (ip_addr_isany(&pcb->remote_ip) || |
| pehrhovey | 0:a548a085de55 | 197 | ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) { |
| pehrhovey | 0:a548a085de55 | 198 | /* the first fully matching PCB */ |
| pehrhovey | 0:a548a085de55 | 199 | if (prev != NULL) { |
| pehrhovey | 0:a548a085de55 | 200 | /* move the pcb to the front of udp_pcbs so that is |
| pehrhovey | 0:a548a085de55 | 201 | found faster next time */ |
| pehrhovey | 0:a548a085de55 | 202 | prev->next = pcb->next; |
| pehrhovey | 0:a548a085de55 | 203 | pcb->next = udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 204 | udp_pcbs = pcb; |
| pehrhovey | 0:a548a085de55 | 205 | } else { |
| pehrhovey | 0:a548a085de55 | 206 | UDP_STATS_INC(udp.cachehit); |
| pehrhovey | 0:a548a085de55 | 207 | } |
| pehrhovey | 0:a548a085de55 | 208 | break; |
| pehrhovey | 0:a548a085de55 | 209 | } |
| pehrhovey | 0:a548a085de55 | 210 | prev = pcb; |
| pehrhovey | 0:a548a085de55 | 211 | } |
| pehrhovey | 0:a548a085de55 | 212 | /* no fully matching pcb found? then look for an unconnected pcb */ |
| pehrhovey | 0:a548a085de55 | 213 | if (pcb == NULL) { |
| pehrhovey | 0:a548a085de55 | 214 | pcb = uncon_pcb; |
| pehrhovey | 0:a548a085de55 | 215 | } |
| pehrhovey | 0:a548a085de55 | 216 | } |
| pehrhovey | 0:a548a085de55 | 217 | |
| pehrhovey | 0:a548a085de55 | 218 | /* Check checksum if this is a match or if it was directed at us. */ |
| pehrhovey | 0:a548a085de55 | 219 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) { |
| pehrhovey | 0:a548a085de55 | 220 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n")); |
| pehrhovey | 0:a548a085de55 | 221 | #if LWIP_UDPLITE |
| pehrhovey | 0:a548a085de55 | 222 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) { |
| pehrhovey | 0:a548a085de55 | 223 | /* Do the UDP Lite checksum */ |
| pehrhovey | 0:a548a085de55 | 224 | #if CHECKSUM_CHECK_UDP |
| pehrhovey | 0:a548a085de55 | 225 | u16_t chklen = ntohs(udphdr->len); |
| pehrhovey | 0:a548a085de55 | 226 | if (chklen < sizeof(struct udp_hdr)) { |
| pehrhovey | 0:a548a085de55 | 227 | if (chklen == 0) { |
| pehrhovey | 0:a548a085de55 | 228 | /* For UDP-Lite, checksum length of 0 means checksum |
| pehrhovey | 0:a548a085de55 | 229 | over the complete packet (See RFC 3828 chap. 3.1) */ |
| pehrhovey | 0:a548a085de55 | 230 | chklen = p->tot_len; |
| pehrhovey | 0:a548a085de55 | 231 | } else { |
| pehrhovey | 0:a548a085de55 | 232 | /* At least the UDP-Lite header must be covered by the |
| pehrhovey | 0:a548a085de55 | 233 | checksum! (Again, see RFC 3828 chap. 3.1) */ |
| pehrhovey | 0:a548a085de55 | 234 | UDP_STATS_INC(udp.chkerr); |
| pehrhovey | 0:a548a085de55 | 235 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 236 | snmp_inc_udpinerrors(); |
| pehrhovey | 0:a548a085de55 | 237 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 238 | goto end; |
| pehrhovey | 0:a548a085de55 | 239 | } |
| pehrhovey | 0:a548a085de55 | 240 | } |
| pehrhovey | 0:a548a085de55 | 241 | if (inet_chksum_pseudo_partial(p, (struct ip_addr *)&(iphdr->src), |
| pehrhovey | 0:a548a085de55 | 242 | (struct ip_addr *)&(iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 243 | IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) { |
| pehrhovey | 0:a548a085de55 | 244 | LWIP_DEBUGF(UDP_DEBUG | 2, |
| pehrhovey | 0:a548a085de55 | 245 | ("udp_input: UDP Lite datagram discarded due to failing checksum\n")); |
| pehrhovey | 0:a548a085de55 | 246 | UDP_STATS_INC(udp.chkerr); |
| pehrhovey | 0:a548a085de55 | 247 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 248 | snmp_inc_udpinerrors(); |
| pehrhovey | 0:a548a085de55 | 249 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 250 | goto end; |
| pehrhovey | 0:a548a085de55 | 251 | } |
| pehrhovey | 0:a548a085de55 | 252 | #endif /* CHECKSUM_CHECK_UDP */ |
| pehrhovey | 0:a548a085de55 | 253 | } else |
| pehrhovey | 0:a548a085de55 | 254 | #endif /* LWIP_UDPLITE */ |
| pehrhovey | 0:a548a085de55 | 255 | { |
| pehrhovey | 0:a548a085de55 | 256 | #if CHECKSUM_CHECK_UDP |
| pehrhovey | 0:a548a085de55 | 257 | if (udphdr->chksum != 0) { |
| pehrhovey | 0:a548a085de55 | 258 | if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src), |
| pehrhovey | 0:a548a085de55 | 259 | (struct ip_addr *)&(iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 260 | IP_PROTO_UDP, p->tot_len) != 0) { |
| pehrhovey | 0:a548a085de55 | 261 | LWIP_DEBUGF(UDP_DEBUG | 2, |
| pehrhovey | 0:a548a085de55 | 262 | ("udp_input: UDP datagram discarded due to failing checksum\n")); |
| pehrhovey | 0:a548a085de55 | 263 | UDP_STATS_INC(udp.chkerr); |
| pehrhovey | 0:a548a085de55 | 264 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 265 | snmp_inc_udpinerrors(); |
| pehrhovey | 0:a548a085de55 | 266 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 267 | goto end; |
| pehrhovey | 0:a548a085de55 | 268 | } |
| pehrhovey | 0:a548a085de55 | 269 | } |
| pehrhovey | 0:a548a085de55 | 270 | #endif /* CHECKSUM_CHECK_UDP */ |
| pehrhovey | 0:a548a085de55 | 271 | } |
| pehrhovey | 0:a548a085de55 | 272 | if(pbuf_header(p, -UDP_HLEN)) { |
| pehrhovey | 0:a548a085de55 | 273 | /* Can we cope with this failing? Just assert for now */ |
| pehrhovey | 0:a548a085de55 | 274 | LWIP_ASSERT("pbuf_header failed\n", 0); |
| pehrhovey | 0:a548a085de55 | 275 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 276 | snmp_inc_udpinerrors(); |
| pehrhovey | 0:a548a085de55 | 277 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 278 | goto end; |
| pehrhovey | 0:a548a085de55 | 279 | } |
| pehrhovey | 0:a548a085de55 | 280 | if (pcb != NULL) { |
| pehrhovey | 0:a548a085de55 | 281 | snmp_inc_udpindatagrams(); |
| pehrhovey | 0:a548a085de55 | 282 | /* callback */ |
| pehrhovey | 0:a548a085de55 | 283 | if (pcb->recv != NULL) { |
| pehrhovey | 0:a548a085de55 | 284 | /* now the recv function is responsible for freeing p */ |
| pehrhovey | 0:a548a085de55 | 285 | pcb->recv(pcb->recv_arg, pcb, p, &iphdr->src, src); |
| pehrhovey | 0:a548a085de55 | 286 | } else { |
| pehrhovey | 0:a548a085de55 | 287 | /* no recv function registered? then we have to free the pbuf! */ |
| pehrhovey | 0:a548a085de55 | 288 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 289 | goto end; |
| pehrhovey | 0:a548a085de55 | 290 | } |
| pehrhovey | 0:a548a085de55 | 291 | } else { |
| pehrhovey | 0:a548a085de55 | 292 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n")); |
| pehrhovey | 0:a548a085de55 | 293 | |
| pehrhovey | 0:a548a085de55 | 294 | #if LWIP_ICMP |
| pehrhovey | 0:a548a085de55 | 295 | /* No match was found, send ICMP destination port unreachable unless |
| pehrhovey | 0:a548a085de55 | 296 | destination address was broadcast/multicast. */ |
| pehrhovey | 0:a548a085de55 | 297 | if (!broadcast && |
| pehrhovey | 0:a548a085de55 | 298 | !ip_addr_ismulticast(&iphdr->dest)) { |
| pehrhovey | 0:a548a085de55 | 299 | /* move payload pointer back to ip header */ |
| pehrhovey | 0:a548a085de55 | 300 | pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN); |
| pehrhovey | 0:a548a085de55 | 301 | LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr)); |
| pehrhovey | 0:a548a085de55 | 302 | icmp_dest_unreach(p, ICMP_DUR_PORT); |
| pehrhovey | 0:a548a085de55 | 303 | } |
| pehrhovey | 0:a548a085de55 | 304 | #endif /* LWIP_ICMP */ |
| pehrhovey | 0:a548a085de55 | 305 | UDP_STATS_INC(udp.proterr); |
| pehrhovey | 0:a548a085de55 | 306 | UDP_STATS_INC(udp.drop); |
| pehrhovey | 0:a548a085de55 | 307 | snmp_inc_udpnoports(); |
| pehrhovey | 0:a548a085de55 | 308 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 309 | } |
| pehrhovey | 0:a548a085de55 | 310 | } else { |
| pehrhovey | 0:a548a085de55 | 311 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 312 | } |
| pehrhovey | 0:a548a085de55 | 313 | end: |
| pehrhovey | 0:a548a085de55 | 314 | PERF_STOP("udp_input"); |
| pehrhovey | 0:a548a085de55 | 315 | } |
| pehrhovey | 0:a548a085de55 | 316 | |
| pehrhovey | 0:a548a085de55 | 317 | /** |
| pehrhovey | 0:a548a085de55 | 318 | * Send data using UDP. |
| pehrhovey | 0:a548a085de55 | 319 | * |
| pehrhovey | 0:a548a085de55 | 320 | * @param pcb UDP PCB used to send the data. |
| pehrhovey | 0:a548a085de55 | 321 | * @param p chain of pbuf's to be sent. |
| pehrhovey | 0:a548a085de55 | 322 | * |
| pehrhovey | 0:a548a085de55 | 323 | * The datagram will be sent to the current remote_ip & remote_port |
| pehrhovey | 0:a548a085de55 | 324 | * stored in pcb. If the pcb is not bound to a port, it will |
| pehrhovey | 0:a548a085de55 | 325 | * automatically be bound to a random port. |
| pehrhovey | 0:a548a085de55 | 326 | * |
| pehrhovey | 0:a548a085de55 | 327 | * @return lwIP error code. |
| pehrhovey | 0:a548a085de55 | 328 | * - ERR_OK. Successful. No error occured. |
| pehrhovey | 0:a548a085de55 | 329 | * - ERR_MEM. Out of memory. |
| pehrhovey | 0:a548a085de55 | 330 | * - ERR_RTE. Could not find route to destination address. |
| pehrhovey | 0:a548a085de55 | 331 | * - More errors could be returned by lower protocol layers. |
| pehrhovey | 0:a548a085de55 | 332 | * |
| pehrhovey | 0:a548a085de55 | 333 | * @see udp_disconnect() udp_sendto() |
| pehrhovey | 0:a548a085de55 | 334 | */ |
| pehrhovey | 0:a548a085de55 | 335 | err_t |
| pehrhovey | 0:a548a085de55 | 336 | udp_send(struct udp_pcb *pcb, struct pbuf *p) |
| pehrhovey | 0:a548a085de55 | 337 | { |
| pehrhovey | 0:a548a085de55 | 338 | /* send to the packet using remote ip and port stored in the pcb */ |
| pehrhovey | 0:a548a085de55 | 339 | return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port); |
| pehrhovey | 0:a548a085de55 | 340 | } |
| pehrhovey | 0:a548a085de55 | 341 | |
| pehrhovey | 0:a548a085de55 | 342 | /** |
| pehrhovey | 0:a548a085de55 | 343 | * Send data to a specified address using UDP. |
| pehrhovey | 0:a548a085de55 | 344 | * |
| pehrhovey | 0:a548a085de55 | 345 | * @param pcb UDP PCB used to send the data. |
| pehrhovey | 0:a548a085de55 | 346 | * @param p chain of pbuf's to be sent. |
| pehrhovey | 0:a548a085de55 | 347 | * @param dst_ip Destination IP address. |
| pehrhovey | 0:a548a085de55 | 348 | * @param dst_port Destination UDP port. |
| pehrhovey | 0:a548a085de55 | 349 | * |
| pehrhovey | 0:a548a085de55 | 350 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
| pehrhovey | 0:a548a085de55 | 351 | * |
| pehrhovey | 0:a548a085de55 | 352 | * If the PCB already has a remote address association, it will |
| pehrhovey | 0:a548a085de55 | 353 | * be restored after the data is sent. |
| pehrhovey | 0:a548a085de55 | 354 | * |
| pehrhovey | 0:a548a085de55 | 355 | * @return lwIP error code (@see udp_send for possible error codes) |
| pehrhovey | 0:a548a085de55 | 356 | * |
| pehrhovey | 0:a548a085de55 | 357 | * @see udp_disconnect() udp_send() |
| pehrhovey | 0:a548a085de55 | 358 | */ |
| pehrhovey | 0:a548a085de55 | 359 | err_t |
| pehrhovey | 0:a548a085de55 | 360 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p, |
| pehrhovey | 0:a548a085de55 | 361 | struct ip_addr *dst_ip, u16_t dst_port) |
| pehrhovey | 0:a548a085de55 | 362 | { |
| pehrhovey | 0:a548a085de55 | 363 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 364 | |
| pehrhovey | 0:a548a085de55 | 365 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, ("udp_send\n")); |
| pehrhovey | 0:a548a085de55 | 366 | |
| pehrhovey | 0:a548a085de55 | 367 | /* find the outgoing network interface for this packet */ |
| pehrhovey | 0:a548a085de55 | 368 | #if LWIP_IGMP |
| pehrhovey | 0:a548a085de55 | 369 | netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip)); |
| pehrhovey | 0:a548a085de55 | 370 | #else |
| pehrhovey | 0:a548a085de55 | 371 | netif = ip_route(dst_ip); |
| pehrhovey | 0:a548a085de55 | 372 | #endif /* LWIP_IGMP */ |
| pehrhovey | 0:a548a085de55 | 373 | |
| pehrhovey | 0:a548a085de55 | 374 | /* no outgoing network interface could be found? */ |
| pehrhovey | 0:a548a085de55 | 375 | if (netif == NULL) { |
| pehrhovey | 0:a548a085de55 | 376 | LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%"X32_F"\n", dst_ip->addr)); |
| pehrhovey | 0:a548a085de55 | 377 | UDP_STATS_INC(udp.rterr); |
| pehrhovey | 0:a548a085de55 | 378 | return ERR_RTE; |
| pehrhovey | 0:a548a085de55 | 379 | } |
| pehrhovey | 0:a548a085de55 | 380 | return udp_sendto_if(pcb, p, dst_ip, dst_port, netif); |
| pehrhovey | 0:a548a085de55 | 381 | } |
| pehrhovey | 0:a548a085de55 | 382 | |
| pehrhovey | 0:a548a085de55 | 383 | /** |
| pehrhovey | 0:a548a085de55 | 384 | * Send data to a specified address using UDP. |
| pehrhovey | 0:a548a085de55 | 385 | * The netif used for sending can be specified. |
| pehrhovey | 0:a548a085de55 | 386 | * |
| pehrhovey | 0:a548a085de55 | 387 | * This function exists mainly for DHCP, to be able to send UDP packets |
| pehrhovey | 0:a548a085de55 | 388 | * on a netif that is still down. |
| pehrhovey | 0:a548a085de55 | 389 | * |
| pehrhovey | 0:a548a085de55 | 390 | * @param pcb UDP PCB used to send the data. |
| pehrhovey | 0:a548a085de55 | 391 | * @param p chain of pbuf's to be sent. |
| pehrhovey | 0:a548a085de55 | 392 | * @param dst_ip Destination IP address. |
| pehrhovey | 0:a548a085de55 | 393 | * @param dst_port Destination UDP port. |
| pehrhovey | 0:a548a085de55 | 394 | * @param netif the netif used for sending. |
| pehrhovey | 0:a548a085de55 | 395 | * |
| pehrhovey | 0:a548a085de55 | 396 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
| pehrhovey | 0:a548a085de55 | 397 | * |
| pehrhovey | 0:a548a085de55 | 398 | * @return lwIP error code (@see udp_send for possible error codes) |
| pehrhovey | 0:a548a085de55 | 399 | * |
| pehrhovey | 0:a548a085de55 | 400 | * @see udp_disconnect() udp_send() |
| pehrhovey | 0:a548a085de55 | 401 | */ |
| pehrhovey | 0:a548a085de55 | 402 | err_t |
| pehrhovey | 0:a548a085de55 | 403 | udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p, |
| pehrhovey | 0:a548a085de55 | 404 | struct ip_addr *dst_ip, u16_t dst_port, struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 405 | { |
| pehrhovey | 0:a548a085de55 | 406 | struct udp_hdr *udphdr; |
| pehrhovey | 0:a548a085de55 | 407 | struct ip_addr *src_ip; |
| pehrhovey | 0:a548a085de55 | 408 | err_t err; |
| pehrhovey | 0:a548a085de55 | 409 | struct pbuf *q; /* q will be sent down the stack */ |
| pehrhovey | 0:a548a085de55 | 410 | |
| pehrhovey | 0:a548a085de55 | 411 | #if IP_SOF_BROADCAST |
| pehrhovey | 0:a548a085de55 | 412 | /* broadcast filter? */ |
| pehrhovey | 0:a548a085de55 | 413 | if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) { |
| pehrhovey | 0:a548a085de55 | 414 | LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb)); |
| pehrhovey | 0:a548a085de55 | 415 | return ERR_VAL; |
| pehrhovey | 0:a548a085de55 | 416 | } |
| pehrhovey | 0:a548a085de55 | 417 | #endif /* IP_SOF_BROADCAST */ |
| pehrhovey | 0:a548a085de55 | 418 | |
| pehrhovey | 0:a548a085de55 | 419 | /* if the PCB is not yet bound to a port, bind it here */ |
| pehrhovey | 0:a548a085de55 | 420 | if (pcb->local_port == 0) { |
| pehrhovey | 0:a548a085de55 | 421 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: not yet bound to a port, binding now\n")); |
| pehrhovey | 0:a548a085de55 | 422 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| pehrhovey | 0:a548a085de55 | 423 | if (err != ERR_OK) { |
| pehrhovey | 0:a548a085de55 | 424 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: forced port bind failed\n")); |
| pehrhovey | 0:a548a085de55 | 425 | return err; |
| pehrhovey | 0:a548a085de55 | 426 | } |
| pehrhovey | 0:a548a085de55 | 427 | } |
| pehrhovey | 0:a548a085de55 | 428 | |
| pehrhovey | 0:a548a085de55 | 429 | /* not enough space to add an UDP header to first pbuf in given p chain? */ |
| pehrhovey | 0:a548a085de55 | 430 | if (pbuf_header(p, UDP_HLEN)) { |
| pehrhovey | 0:a548a085de55 | 431 | /* allocate header in a separate new pbuf */ |
| pehrhovey | 0:a548a085de55 | 432 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM); |
| pehrhovey | 0:a548a085de55 | 433 | /* new header pbuf could not be allocated? */ |
| pehrhovey | 0:a548a085de55 | 434 | if (q == NULL) { |
| pehrhovey | 0:a548a085de55 | 435 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: could not allocate header\n")); |
| pehrhovey | 0:a548a085de55 | 436 | return ERR_MEM; |
| pehrhovey | 0:a548a085de55 | 437 | } |
| pehrhovey | 0:a548a085de55 | 438 | /* chain header q in front of given pbuf p */ |
| pehrhovey | 0:a548a085de55 | 439 | pbuf_chain(q, p); |
| pehrhovey | 0:a548a085de55 | 440 | /* first pbuf q points to header pbuf */ |
| pehrhovey | 0:a548a085de55 | 441 | LWIP_DEBUGF(UDP_DEBUG, |
| pehrhovey | 0:a548a085de55 | 442 | ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); |
| pehrhovey | 0:a548a085de55 | 443 | } else { |
| pehrhovey | 0:a548a085de55 | 444 | /* adding space for header within p succeeded */ |
| pehrhovey | 0:a548a085de55 | 445 | /* first pbuf q equals given pbuf */ |
| pehrhovey | 0:a548a085de55 | 446 | q = p; |
| pehrhovey | 0:a548a085de55 | 447 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p)); |
| pehrhovey | 0:a548a085de55 | 448 | } |
| pehrhovey | 0:a548a085de55 | 449 | LWIP_ASSERT("check that first pbuf can hold struct udp_hdr", |
| pehrhovey | 0:a548a085de55 | 450 | (q->len >= sizeof(struct udp_hdr))); |
| pehrhovey | 0:a548a085de55 | 451 | /* q now represents the packet to be sent */ |
| pehrhovey | 0:a548a085de55 | 452 | udphdr = (struct udp_hdr *)q->payload; |
| pehrhovey | 0:a548a085de55 | 453 | udphdr->src = htons(pcb->local_port); |
| pehrhovey | 0:a548a085de55 | 454 | udphdr->dest = htons(dst_port); |
| pehrhovey | 0:a548a085de55 | 455 | /* in UDP, 0 checksum means 'no checksum' */ |
| pehrhovey | 0:a548a085de55 | 456 | udphdr->chksum = 0x0000; |
| pehrhovey | 0:a548a085de55 | 457 | |
| pehrhovey | 0:a548a085de55 | 458 | /* PCB local address is IP_ANY_ADDR? */ |
| pehrhovey | 0:a548a085de55 | 459 | if (ip_addr_isany(&pcb->local_ip)) { |
| pehrhovey | 0:a548a085de55 | 460 | /* use outgoing network interface IP address as source address */ |
| pehrhovey | 0:a548a085de55 | 461 | src_ip = &(netif->ip_addr); |
| pehrhovey | 0:a548a085de55 | 462 | } else { |
| pehrhovey | 0:a548a085de55 | 463 | /* check if UDP PCB local IP address is correct |
| pehrhovey | 0:a548a085de55 | 464 | * this could be an old address if netif->ip_addr has changed */ |
| pehrhovey | 0:a548a085de55 | 465 | if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) { |
| pehrhovey | 0:a548a085de55 | 466 | /* local_ip doesn't match, drop the packet */ |
| pehrhovey | 0:a548a085de55 | 467 | if (q != p) { |
| pehrhovey | 0:a548a085de55 | 468 | /* free the header pbuf */ |
| pehrhovey | 0:a548a085de55 | 469 | pbuf_free(q); |
| pehrhovey | 0:a548a085de55 | 470 | q = NULL; |
| pehrhovey | 0:a548a085de55 | 471 | /* p is still referenced by the caller, and will live on */ |
| pehrhovey | 0:a548a085de55 | 472 | } |
| pehrhovey | 0:a548a085de55 | 473 | return ERR_VAL; |
| pehrhovey | 0:a548a085de55 | 474 | } |
| pehrhovey | 0:a548a085de55 | 475 | /* use UDP PCB local IP address as source address */ |
| pehrhovey | 0:a548a085de55 | 476 | src_ip = &(pcb->local_ip); |
| pehrhovey | 0:a548a085de55 | 477 | } |
| pehrhovey | 0:a548a085de55 | 478 | |
| pehrhovey | 0:a548a085de55 | 479 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len)); |
| pehrhovey | 0:a548a085de55 | 480 | |
| pehrhovey | 0:a548a085de55 | 481 | #if LWIP_UDPLITE |
| pehrhovey | 0:a548a085de55 | 482 | /* UDP Lite protocol? */ |
| pehrhovey | 0:a548a085de55 | 483 | if (pcb->flags & UDP_FLAGS_UDPLITE) { |
| pehrhovey | 0:a548a085de55 | 484 | u16_t chklen, chklen_hdr; |
| pehrhovey | 0:a548a085de55 | 485 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len)); |
| pehrhovey | 0:a548a085de55 | 486 | /* set UDP message length in UDP header */ |
| pehrhovey | 0:a548a085de55 | 487 | chklen_hdr = chklen = pcb->chksum_len_tx; |
| pehrhovey | 0:a548a085de55 | 488 | if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) { |
| pehrhovey | 0:a548a085de55 | 489 | if (chklen != 0) { |
| pehrhovey | 0:a548a085de55 | 490 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen)); |
| pehrhovey | 0:a548a085de55 | 491 | } |
| pehrhovey | 0:a548a085de55 | 492 | /* For UDP-Lite, checksum length of 0 means checksum |
| pehrhovey | 0:a548a085de55 | 493 | over the complete packet. (See RFC 3828 chap. 3.1) |
| pehrhovey | 0:a548a085de55 | 494 | At least the UDP-Lite header must be covered by the |
| pehrhovey | 0:a548a085de55 | 495 | checksum, therefore, if chksum_len has an illegal |
| pehrhovey | 0:a548a085de55 | 496 | value, we generate the checksum over the complete |
| pehrhovey | 0:a548a085de55 | 497 | packet to be safe. */ |
| pehrhovey | 0:a548a085de55 | 498 | chklen_hdr = 0; |
| pehrhovey | 0:a548a085de55 | 499 | chklen = q->tot_len; |
| pehrhovey | 0:a548a085de55 | 500 | } |
| pehrhovey | 0:a548a085de55 | 501 | udphdr->len = htons(chklen_hdr); |
| pehrhovey | 0:a548a085de55 | 502 | /* calculate checksum */ |
| pehrhovey | 0:a548a085de55 | 503 | #if CHECKSUM_GEN_UDP |
| pehrhovey | 0:a548a085de55 | 504 | udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, |
| pehrhovey | 0:a548a085de55 | 505 | IP_PROTO_UDPLITE, q->tot_len, chklen); |
| pehrhovey | 0:a548a085de55 | 506 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| pehrhovey | 0:a548a085de55 | 507 | if (udphdr->chksum == 0x0000) |
| pehrhovey | 0:a548a085de55 | 508 | udphdr->chksum = 0xffff; |
| pehrhovey | 0:a548a085de55 | 509 | #endif /* CHECKSUM_CHECK_UDP */ |
| pehrhovey | 0:a548a085de55 | 510 | /* output to IP */ |
| pehrhovey | 0:a548a085de55 | 511 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n")); |
| pehrhovey | 0:a548a085de55 | 512 | #if LWIP_NETIF_HWADDRHINT |
| pehrhovey | 0:a548a085de55 | 513 | netif->addr_hint = &(pcb->addr_hint); |
| pehrhovey | 0:a548a085de55 | 514 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| pehrhovey | 0:a548a085de55 | 515 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif); |
| pehrhovey | 0:a548a085de55 | 516 | #if LWIP_NETIF_HWADDRHINT |
| pehrhovey | 0:a548a085de55 | 517 | netif->addr_hint = NULL; |
| pehrhovey | 0:a548a085de55 | 518 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| pehrhovey | 0:a548a085de55 | 519 | } else |
| pehrhovey | 0:a548a085de55 | 520 | #endif /* LWIP_UDPLITE */ |
| pehrhovey | 0:a548a085de55 | 521 | { /* UDP */ |
| pehrhovey | 0:a548a085de55 | 522 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len)); |
| pehrhovey | 0:a548a085de55 | 523 | udphdr->len = htons(q->tot_len); |
| pehrhovey | 0:a548a085de55 | 524 | /* calculate checksum */ |
| pehrhovey | 0:a548a085de55 | 525 | #if CHECKSUM_GEN_UDP |
| pehrhovey | 0:a548a085de55 | 526 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) { |
| pehrhovey | 0:a548a085de55 | 527 | udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len); |
| pehrhovey | 0:a548a085de55 | 528 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| pehrhovey | 0:a548a085de55 | 529 | if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff; |
| pehrhovey | 0:a548a085de55 | 530 | } |
| pehrhovey | 0:a548a085de55 | 531 | #endif /* CHECKSUM_CHECK_UDP */ |
| pehrhovey | 0:a548a085de55 | 532 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum)); |
| pehrhovey | 0:a548a085de55 | 533 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n")); |
| pehrhovey | 0:a548a085de55 | 534 | /* output to IP */ |
| pehrhovey | 0:a548a085de55 | 535 | #if LWIP_NETIF_HWADDRHINT |
| pehrhovey | 0:a548a085de55 | 536 | netif->addr_hint = &(pcb->addr_hint); |
| pehrhovey | 0:a548a085de55 | 537 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| pehrhovey | 0:a548a085de55 | 538 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif); |
| pehrhovey | 0:a548a085de55 | 539 | #if LWIP_NETIF_HWADDRHINT |
| pehrhovey | 0:a548a085de55 | 540 | netif->addr_hint = NULL; |
| pehrhovey | 0:a548a085de55 | 541 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| pehrhovey | 0:a548a085de55 | 542 | } |
| pehrhovey | 0:a548a085de55 | 543 | /* TODO: must this be increased even if error occured? */ |
| pehrhovey | 0:a548a085de55 | 544 | snmp_inc_udpoutdatagrams(); |
| pehrhovey | 0:a548a085de55 | 545 | |
| pehrhovey | 0:a548a085de55 | 546 | /* did we chain a separate header pbuf earlier? */ |
| pehrhovey | 0:a548a085de55 | 547 | if (q != p) { |
| pehrhovey | 0:a548a085de55 | 548 | /* free the header pbuf */ |
| pehrhovey | 0:a548a085de55 | 549 | pbuf_free(q); |
| pehrhovey | 0:a548a085de55 | 550 | q = NULL; |
| pehrhovey | 0:a548a085de55 | 551 | /* p is still referenced by the caller, and will live on */ |
| pehrhovey | 0:a548a085de55 | 552 | } |
| pehrhovey | 0:a548a085de55 | 553 | |
| pehrhovey | 0:a548a085de55 | 554 | UDP_STATS_INC(udp.xmit); |
| pehrhovey | 0:a548a085de55 | 555 | return err; |
| pehrhovey | 0:a548a085de55 | 556 | } |
| pehrhovey | 0:a548a085de55 | 557 | |
| pehrhovey | 0:a548a085de55 | 558 | /** |
| pehrhovey | 0:a548a085de55 | 559 | * Bind an UDP PCB. |
| pehrhovey | 0:a548a085de55 | 560 | * |
| pehrhovey | 0:a548a085de55 | 561 | * @param pcb UDP PCB to be bound with a local address ipaddr and port. |
| pehrhovey | 0:a548a085de55 | 562 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to |
| pehrhovey | 0:a548a085de55 | 563 | * bind to all local interfaces. |
| pehrhovey | 0:a548a085de55 | 564 | * @param port local UDP port to bind with. Use 0 to automatically bind |
| pehrhovey | 0:a548a085de55 | 565 | * to a random port between UDP_LOCAL_PORT_RANGE_START and |
| pehrhovey | 0:a548a085de55 | 566 | * UDP_LOCAL_PORT_RANGE_END. |
| pehrhovey | 0:a548a085de55 | 567 | * |
| pehrhovey | 0:a548a085de55 | 568 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
| pehrhovey | 0:a548a085de55 | 569 | * |
| pehrhovey | 0:a548a085de55 | 570 | * @return lwIP error code. |
| pehrhovey | 0:a548a085de55 | 571 | * - ERR_OK. Successful. No error occured. |
| pehrhovey | 0:a548a085de55 | 572 | * - ERR_USE. The specified ipaddr and port are already bound to by |
| pehrhovey | 0:a548a085de55 | 573 | * another UDP PCB. |
| pehrhovey | 0:a548a085de55 | 574 | * |
| pehrhovey | 0:a548a085de55 | 575 | * @see udp_disconnect() |
| pehrhovey | 0:a548a085de55 | 576 | */ |
| pehrhovey | 0:a548a085de55 | 577 | err_t |
| pehrhovey | 0:a548a085de55 | 578 | udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
| pehrhovey | 0:a548a085de55 | 579 | { |
| pehrhovey | 0:a548a085de55 | 580 | struct udp_pcb *ipcb; |
| pehrhovey | 0:a548a085de55 | 581 | u8_t rebind; |
| pehrhovey | 0:a548a085de55 | 582 | |
| pehrhovey | 0:a548a085de55 | 583 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, ("udp_bind(ipaddr = ")); |
| pehrhovey | 0:a548a085de55 | 584 | ip_addr_debug_print(UDP_DEBUG, ipaddr); |
| pehrhovey | 0:a548a085de55 | 585 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, (", port = %"U16_F")\n", port)); |
| pehrhovey | 0:a548a085de55 | 586 | |
| pehrhovey | 0:a548a085de55 | 587 | rebind = 0; |
| pehrhovey | 0:a548a085de55 | 588 | /* Check for double bind and rebind of the same pcb */ |
| pehrhovey | 0:a548a085de55 | 589 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| pehrhovey | 0:a548a085de55 | 590 | /* is this UDP PCB already on active list? */ |
| pehrhovey | 0:a548a085de55 | 591 | if (pcb == ipcb) { |
| pehrhovey | 0:a548a085de55 | 592 | /* pcb may occur at most once in active list */ |
| pehrhovey | 0:a548a085de55 | 593 | LWIP_ASSERT("rebind == 0", rebind == 0); |
| pehrhovey | 0:a548a085de55 | 594 | /* pcb already in list, just rebind */ |
| pehrhovey | 0:a548a085de55 | 595 | rebind = 1; |
| pehrhovey | 0:a548a085de55 | 596 | } |
| pehrhovey | 0:a548a085de55 | 597 | |
| pehrhovey | 0:a548a085de55 | 598 | /* this code does not allow upper layer to share a UDP port for |
| pehrhovey | 0:a548a085de55 | 599 | listening to broadcast or multicast traffic (See SO_REUSE_ADDR and |
| pehrhovey | 0:a548a085de55 | 600 | SO_REUSE_PORT under *BSD). TODO: See where it fits instead, OR |
| pehrhovey | 0:a548a085de55 | 601 | combine with implementation of UDP PCB flags. Leon Woestenberg. */ |
| pehrhovey | 0:a548a085de55 | 602 | #ifdef LWIP_UDP_TODO |
| pehrhovey | 0:a548a085de55 | 603 | /* port matches that of PCB in list? */ |
| pehrhovey | 0:a548a085de55 | 604 | else |
| pehrhovey | 0:a548a085de55 | 605 | if ((ipcb->local_port == port) && |
| pehrhovey | 0:a548a085de55 | 606 | /* IP address matches, or one is IP_ADDR_ANY? */ |
| pehrhovey | 0:a548a085de55 | 607 | (ip_addr_isany(&(ipcb->local_ip)) || |
| pehrhovey | 0:a548a085de55 | 608 | ip_addr_isany(ipaddr) || |
| pehrhovey | 0:a548a085de55 | 609 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) { |
| pehrhovey | 0:a548a085de55 | 610 | /* other PCB already binds to this local IP and port */ |
| pehrhovey | 0:a548a085de55 | 611 | LWIP_DEBUGF(UDP_DEBUG, |
| pehrhovey | 0:a548a085de55 | 612 | ("udp_bind: local port %"U16_F" already bound by another pcb\n", port)); |
| pehrhovey | 0:a548a085de55 | 613 | return ERR_USE; |
| pehrhovey | 0:a548a085de55 | 614 | } |
| pehrhovey | 0:a548a085de55 | 615 | #endif |
| pehrhovey | 0:a548a085de55 | 616 | } |
| pehrhovey | 0:a548a085de55 | 617 | |
| pehrhovey | 0:a548a085de55 | 618 | ip_addr_set(&pcb->local_ip, ipaddr); |
| pehrhovey | 0:a548a085de55 | 619 | |
| pehrhovey | 0:a548a085de55 | 620 | /* no port specified? */ |
| pehrhovey | 0:a548a085de55 | 621 | if (port == 0) { |
| pehrhovey | 0:a548a085de55 | 622 | #ifndef UDP_LOCAL_PORT_RANGE_START |
| pehrhovey | 0:a548a085de55 | 623 | #define UDP_LOCAL_PORT_RANGE_START 4096 |
| pehrhovey | 0:a548a085de55 | 624 | #define UDP_LOCAL_PORT_RANGE_END 0x7fff |
| pehrhovey | 0:a548a085de55 | 625 | #endif |
| pehrhovey | 0:a548a085de55 | 626 | port = UDP_LOCAL_PORT_RANGE_START; |
| pehrhovey | 0:a548a085de55 | 627 | ipcb = udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 628 | while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) { |
| pehrhovey | 0:a548a085de55 | 629 | if (ipcb->local_port == port) { |
| pehrhovey | 0:a548a085de55 | 630 | /* port is already used by another udp_pcb */ |
| pehrhovey | 0:a548a085de55 | 631 | port++; |
| pehrhovey | 0:a548a085de55 | 632 | /* restart scanning all udp pcbs */ |
| pehrhovey | 0:a548a085de55 | 633 | ipcb = udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 634 | } else |
| pehrhovey | 0:a548a085de55 | 635 | /* go on with next udp pcb */ |
| pehrhovey | 0:a548a085de55 | 636 | ipcb = ipcb->next; |
| pehrhovey | 0:a548a085de55 | 637 | } |
| pehrhovey | 0:a548a085de55 | 638 | if (ipcb != NULL) { |
| pehrhovey | 0:a548a085de55 | 639 | /* no more ports available in local range */ |
| pehrhovey | 0:a548a085de55 | 640 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n")); |
| pehrhovey | 0:a548a085de55 | 641 | return ERR_USE; |
| pehrhovey | 0:a548a085de55 | 642 | } |
| pehrhovey | 0:a548a085de55 | 643 | } |
| pehrhovey | 0:a548a085de55 | 644 | pcb->local_port = port; |
| pehrhovey | 0:a548a085de55 | 645 | snmp_insert_udpidx_tree(pcb); |
| pehrhovey | 0:a548a085de55 | 646 | /* pcb not active yet? */ |
| pehrhovey | 0:a548a085de55 | 647 | if (rebind == 0) { |
| pehrhovey | 0:a548a085de55 | 648 | /* place the PCB on the active list if not already there */ |
| pehrhovey | 0:a548a085de55 | 649 | pcb->next = udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 650 | udp_pcbs = pcb; |
| pehrhovey | 0:a548a085de55 | 651 | } |
| pehrhovey | 0:a548a085de55 | 652 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| pehrhovey | 0:a548a085de55 | 653 | ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n", |
| pehrhovey | 0:a548a085de55 | 654 | (u16_t)((ntohl(pcb->local_ip.addr) >> 24) & 0xff), |
| pehrhovey | 0:a548a085de55 | 655 | (u16_t)((ntohl(pcb->local_ip.addr) >> 16) & 0xff), |
| pehrhovey | 0:a548a085de55 | 656 | (u16_t)((ntohl(pcb->local_ip.addr) >> 8) & 0xff), |
| pehrhovey | 0:a548a085de55 | 657 | (u16_t)(ntohl(pcb->local_ip.addr) & 0xff), pcb->local_port)); |
| pehrhovey | 0:a548a085de55 | 658 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 659 | } |
| pehrhovey | 0:a548a085de55 | 660 | /** |
| pehrhovey | 0:a548a085de55 | 661 | * Connect an UDP PCB. |
| pehrhovey | 0:a548a085de55 | 662 | * |
| pehrhovey | 0:a548a085de55 | 663 | * This will associate the UDP PCB with the remote address. |
| pehrhovey | 0:a548a085de55 | 664 | * |
| pehrhovey | 0:a548a085de55 | 665 | * @param pcb UDP PCB to be connected with remote address ipaddr and port. |
| pehrhovey | 0:a548a085de55 | 666 | * @param ipaddr remote IP address to connect with. |
| pehrhovey | 0:a548a085de55 | 667 | * @param port remote UDP port to connect with. |
| pehrhovey | 0:a548a085de55 | 668 | * |
| pehrhovey | 0:a548a085de55 | 669 | * @return lwIP error code |
| pehrhovey | 0:a548a085de55 | 670 | * |
| pehrhovey | 0:a548a085de55 | 671 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
| pehrhovey | 0:a548a085de55 | 672 | * |
| pehrhovey | 0:a548a085de55 | 673 | * The udp pcb is bound to a random local port if not already bound. |
| pehrhovey | 0:a548a085de55 | 674 | * |
| pehrhovey | 0:a548a085de55 | 675 | * @see udp_disconnect() |
| pehrhovey | 0:a548a085de55 | 676 | */ |
| pehrhovey | 0:a548a085de55 | 677 | err_t |
| pehrhovey | 0:a548a085de55 | 678 | udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
| pehrhovey | 0:a548a085de55 | 679 | { |
| pehrhovey | 0:a548a085de55 | 680 | struct udp_pcb *ipcb; |
| pehrhovey | 0:a548a085de55 | 681 | |
| pehrhovey | 0:a548a085de55 | 682 | if (pcb->local_port == 0) { |
| pehrhovey | 0:a548a085de55 | 683 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| pehrhovey | 0:a548a085de55 | 684 | if (err != ERR_OK) |
| pehrhovey | 0:a548a085de55 | 685 | return err; |
| pehrhovey | 0:a548a085de55 | 686 | } |
| pehrhovey | 0:a548a085de55 | 687 | |
| pehrhovey | 0:a548a085de55 | 688 | ip_addr_set(&pcb->remote_ip, ipaddr); |
| pehrhovey | 0:a548a085de55 | 689 | pcb->remote_port = port; |
| pehrhovey | 0:a548a085de55 | 690 | pcb->flags |= UDP_FLAGS_CONNECTED; |
| pehrhovey | 0:a548a085de55 | 691 | /** TODO: this functionality belongs in upper layers */ |
| pehrhovey | 0:a548a085de55 | 692 | #ifdef LWIP_UDP_TODO |
| pehrhovey | 0:a548a085de55 | 693 | /* Nail down local IP for netconn_addr()/getsockname() */ |
| pehrhovey | 0:a548a085de55 | 694 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) { |
| pehrhovey | 0:a548a085de55 | 695 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 696 | |
| pehrhovey | 0:a548a085de55 | 697 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) { |
| pehrhovey | 0:a548a085de55 | 698 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr)); |
| pehrhovey | 0:a548a085de55 | 699 | UDP_STATS_INC(udp.rterr); |
| pehrhovey | 0:a548a085de55 | 700 | return ERR_RTE; |
| pehrhovey | 0:a548a085de55 | 701 | } |
| pehrhovey | 0:a548a085de55 | 702 | /** TODO: this will bind the udp pcb locally, to the interface which |
| pehrhovey | 0:a548a085de55 | 703 | is used to route output packets to the remote address. However, we |
| pehrhovey | 0:a548a085de55 | 704 | might want to accept incoming packets on any interface! */ |
| pehrhovey | 0:a548a085de55 | 705 | pcb->local_ip = netif->ip_addr; |
| pehrhovey | 0:a548a085de55 | 706 | } else if (ip_addr_isany(&pcb->remote_ip)) { |
| pehrhovey | 0:a548a085de55 | 707 | pcb->local_ip.addr = 0; |
| pehrhovey | 0:a548a085de55 | 708 | } |
| pehrhovey | 0:a548a085de55 | 709 | #endif |
| pehrhovey | 0:a548a085de55 | 710 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| pehrhovey | 0:a548a085de55 | 711 | ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n", |
| pehrhovey | 0:a548a085de55 | 712 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 24) & 0xff), |
| pehrhovey | 0:a548a085de55 | 713 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 16) & 0xff), |
| pehrhovey | 0:a548a085de55 | 714 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 8) & 0xff), |
| pehrhovey | 0:a548a085de55 | 715 | (u16_t)(ntohl(pcb->remote_ip.addr) & 0xff), pcb->remote_port)); |
| pehrhovey | 0:a548a085de55 | 716 | |
| pehrhovey | 0:a548a085de55 | 717 | /* Insert UDP PCB into the list of active UDP PCBs. */ |
| pehrhovey | 0:a548a085de55 | 718 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| pehrhovey | 0:a548a085de55 | 719 | if (pcb == ipcb) { |
| pehrhovey | 0:a548a085de55 | 720 | /* already on the list, just return */ |
| pehrhovey | 0:a548a085de55 | 721 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 722 | } |
| pehrhovey | 0:a548a085de55 | 723 | } |
| pehrhovey | 0:a548a085de55 | 724 | /* PCB not yet on the list, add PCB now */ |
| pehrhovey | 0:a548a085de55 | 725 | pcb->next = udp_pcbs; |
| pehrhovey | 0:a548a085de55 | 726 | udp_pcbs = pcb; |
| pehrhovey | 0:a548a085de55 | 727 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 728 | } |
| pehrhovey | 0:a548a085de55 | 729 | |
| pehrhovey | 0:a548a085de55 | 730 | /** |
| pehrhovey | 0:a548a085de55 | 731 | * Disconnect a UDP PCB |
| pehrhovey | 0:a548a085de55 | 732 | * |
| pehrhovey | 0:a548a085de55 | 733 | * @param pcb the udp pcb to disconnect. |
| pehrhovey | 0:a548a085de55 | 734 | */ |
| pehrhovey | 0:a548a085de55 | 735 | void |
| pehrhovey | 0:a548a085de55 | 736 | udp_disconnect(struct udp_pcb *pcb) |
| pehrhovey | 0:a548a085de55 | 737 | { |
| pehrhovey | 0:a548a085de55 | 738 | /* reset remote address association */ |
| pehrhovey | 0:a548a085de55 | 739 | ip_addr_set(&pcb->remote_ip, IP_ADDR_ANY); |
| pehrhovey | 0:a548a085de55 | 740 | pcb->remote_port = 0; |
| pehrhovey | 0:a548a085de55 | 741 | /* mark PCB as unconnected */ |
| pehrhovey | 0:a548a085de55 | 742 | pcb->flags &= ~UDP_FLAGS_CONNECTED; |
| pehrhovey | 0:a548a085de55 | 743 | } |
| pehrhovey | 0:a548a085de55 | 744 | |
| pehrhovey | 0:a548a085de55 | 745 | /** |
| pehrhovey | 0:a548a085de55 | 746 | * Set a receive callback for a UDP PCB |
| pehrhovey | 0:a548a085de55 | 747 | * |
| pehrhovey | 0:a548a085de55 | 748 | * This callback will be called when receiving a datagram for the pcb. |
| pehrhovey | 0:a548a085de55 | 749 | * |
| pehrhovey | 0:a548a085de55 | 750 | * @param pcb the pcb for wich to set the recv callback |
| pehrhovey | 0:a548a085de55 | 751 | * @param recv function pointer of the callback function |
| pehrhovey | 0:a548a085de55 | 752 | * @param recv_arg additional argument to pass to the callback function |
| pehrhovey | 0:a548a085de55 | 753 | */ |
| pehrhovey | 0:a548a085de55 | 754 | void |
| pehrhovey | 0:a548a085de55 | 755 | udp_recv(struct udp_pcb *pcb, |
| pehrhovey | 0:a548a085de55 | 756 | void (* recv)(void *arg, struct udp_pcb *upcb, struct pbuf *p, |
| pehrhovey | 0:a548a085de55 | 757 | struct ip_addr *addr, u16_t port), |
| pehrhovey | 0:a548a085de55 | 758 | void *recv_arg) |
| pehrhovey | 0:a548a085de55 | 759 | { |
| pehrhovey | 0:a548a085de55 | 760 | /* remember recv() callback and user data */ |
| pehrhovey | 0:a548a085de55 | 761 | pcb->recv = recv; |
| pehrhovey | 0:a548a085de55 | 762 | pcb->recv_arg = recv_arg; |
| pehrhovey | 0:a548a085de55 | 763 | } |
| pehrhovey | 0:a548a085de55 | 764 | |
| pehrhovey | 0:a548a085de55 | 765 | /** |
| pehrhovey | 0:a548a085de55 | 766 | * Remove an UDP PCB. |
| pehrhovey | 0:a548a085de55 | 767 | * |
| pehrhovey | 0:a548a085de55 | 768 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of |
| pehrhovey | 0:a548a085de55 | 769 | * UDP PCB's and the data structure is freed from memory. |
| pehrhovey | 0:a548a085de55 | 770 | * |
| pehrhovey | 0:a548a085de55 | 771 | * @see udp_new() |
| pehrhovey | 0:a548a085de55 | 772 | */ |
| pehrhovey | 0:a548a085de55 | 773 | void |
| pehrhovey | 0:a548a085de55 | 774 | udp_remove(struct udp_pcb *pcb) |
| pehrhovey | 0:a548a085de55 | 775 | { |
| pehrhovey | 0:a548a085de55 | 776 | struct udp_pcb *pcb2; |
| pehrhovey | 0:a548a085de55 | 777 | |
| pehrhovey | 0:a548a085de55 | 778 | snmp_delete_udpidx_tree(pcb); |
| pehrhovey | 0:a548a085de55 | 779 | /* pcb to be removed is first in list? */ |
| pehrhovey | 0:a548a085de55 | 780 | if (udp_pcbs == pcb) { |
| pehrhovey | 0:a548a085de55 | 781 | /* make list start at 2nd pcb */ |
| pehrhovey | 0:a548a085de55 | 782 | udp_pcbs = udp_pcbs->next; |
| pehrhovey | 0:a548a085de55 | 783 | /* pcb not 1st in list */ |
| pehrhovey | 0:a548a085de55 | 784 | } else |
| pehrhovey | 0:a548a085de55 | 785 | for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { |
| pehrhovey | 0:a548a085de55 | 786 | /* find pcb in udp_pcbs list */ |
| pehrhovey | 0:a548a085de55 | 787 | if (pcb2->next != NULL && pcb2->next == pcb) { |
| pehrhovey | 0:a548a085de55 | 788 | /* remove pcb from list */ |
| pehrhovey | 0:a548a085de55 | 789 | pcb2->next = pcb->next; |
| pehrhovey | 0:a548a085de55 | 790 | } |
| pehrhovey | 0:a548a085de55 | 791 | } |
| pehrhovey | 0:a548a085de55 | 792 | memp_free(MEMP_UDP_PCB, pcb); |
| pehrhovey | 0:a548a085de55 | 793 | } |
| pehrhovey | 0:a548a085de55 | 794 | |
| pehrhovey | 0:a548a085de55 | 795 | /** |
| pehrhovey | 0:a548a085de55 | 796 | * Create a UDP PCB. |
| pehrhovey | 0:a548a085de55 | 797 | * |
| pehrhovey | 0:a548a085de55 | 798 | * @return The UDP PCB which was created. NULL if the PCB data structure |
| pehrhovey | 0:a548a085de55 | 799 | * could not be allocated. |
| pehrhovey | 0:a548a085de55 | 800 | * |
| pehrhovey | 0:a548a085de55 | 801 | * @see udp_remove() |
| pehrhovey | 0:a548a085de55 | 802 | */ |
| pehrhovey | 0:a548a085de55 | 803 | struct udp_pcb * |
| pehrhovey | 0:a548a085de55 | 804 | udp_new(void) |
| pehrhovey | 0:a548a085de55 | 805 | { |
| pehrhovey | 0:a548a085de55 | 806 | struct udp_pcb *pcb; |
| pehrhovey | 0:a548a085de55 | 807 | pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB); |
| pehrhovey | 0:a548a085de55 | 808 | /* could allocate UDP PCB? */ |
| pehrhovey | 0:a548a085de55 | 809 | if (pcb != NULL) { |
| pehrhovey | 0:a548a085de55 | 810 | /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0 |
| pehrhovey | 0:a548a085de55 | 811 | * which means checksum is generated over the whole datagram per default |
| pehrhovey | 0:a548a085de55 | 812 | * (recommended as default by RFC 3828). */ |
| pehrhovey | 0:a548a085de55 | 813 | /* initialize PCB to all zeroes */ |
| pehrhovey | 0:a548a085de55 | 814 | memset(pcb, 0, sizeof(struct udp_pcb)); |
| pehrhovey | 0:a548a085de55 | 815 | pcb->ttl = UDP_TTL; |
| pehrhovey | 0:a548a085de55 | 816 | } |
| pehrhovey | 0:a548a085de55 | 817 | return pcb; |
| pehrhovey | 0:a548a085de55 | 818 | } |
| pehrhovey | 0:a548a085de55 | 819 | |
| pehrhovey | 0:a548a085de55 | 820 | #if UDP_DEBUG |
| pehrhovey | 0:a548a085de55 | 821 | /** |
| pehrhovey | 0:a548a085de55 | 822 | * Print UDP header information for debug purposes. |
| pehrhovey | 0:a548a085de55 | 823 | * |
| pehrhovey | 0:a548a085de55 | 824 | * @param udphdr pointer to the udp header in memory. |
| pehrhovey | 0:a548a085de55 | 825 | */ |
| pehrhovey | 0:a548a085de55 | 826 | void |
| pehrhovey | 0:a548a085de55 | 827 | udp_debug_print(struct udp_hdr *udphdr) |
| pehrhovey | 0:a548a085de55 | 828 | { |
| pehrhovey | 0:a548a085de55 | 829 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n")); |
| pehrhovey | 0:a548a085de55 | 830 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 831 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n", |
| pehrhovey | 0:a548a085de55 | 832 | ntohs(udphdr->src), ntohs(udphdr->dest))); |
| pehrhovey | 0:a548a085de55 | 833 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 834 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n", |
| pehrhovey | 0:a548a085de55 | 835 | ntohs(udphdr->len), ntohs(udphdr->chksum))); |
| pehrhovey | 0:a548a085de55 | 836 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 837 | } |
| pehrhovey | 0:a548a085de55 | 838 | #endif /* UDP_DEBUG */ |
| pehrhovey | 0:a548a085de55 | 839 | |
| pehrhovey | 0:a548a085de55 | 840 | #endif /* LWIP_UDP */ |