Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /** |
| 2 | * @file |
| 3 | * User Datagram Protocol module |
| 4 | * |
| 5 | */ |
| 6 | /* |
| 7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without modification, |
| 11 | * are permitted provided that the following conditions are met: |
| 12 | * |
| 13 | * 1. Redistributions of source code must retain the above copyright notice, |
| 14 | * this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 16 | * this list of conditions and the following disclaimer in the documentation |
| 17 | * and/or other materials provided with the distribution. |
| 18 | * 3. The name of the author may not be used to endorse or promote products |
| 19 | * derived from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| 30 | * OF SUCH DAMAGE. |
| 31 | * |
| 32 | * This file is part of the lwIP TCP/IP stack. |
| 33 | * |
| 34 | * Author: Adam Dunkels <adam@sics.se> |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | |
| 39 | /* udp.c |
| 40 | * |
| 41 | * The code for the User Datagram Protocol UDP. |
| 42 | * |
| 43 | */ |
| 44 | |
| 45 | #include <string.h> |
| 46 | |
| 47 | #include "lwip/opt.h" |
| 48 | |
| 49 | #include "lwip/def.h" |
| 50 | #include "lwip/memp.h" |
| 51 | #include "lwip/inet.h" |
| 52 | #include "lwip/ip_addr.h" |
| 53 | #include "lwip/netif.h" |
| 54 | #include "lwip/udp.h" |
| 55 | #include "lwip/icmp.h" |
| 56 | |
| 57 | #include "lwip/stats.h" |
| 58 | |
| 59 | #include "arch/perf.h" |
| 60 | #include "lwip/snmp.h" |
| 61 | |
| 62 | /* The list of UDP PCBs */ |
| 63 | #if LWIP_UDP |
| 64 | /* was static, but we may want to access this from a socket layer */ |
| 65 | struct udp_pcb *udp_pcbs = NULL; |
| 66 | |
| 67 | static struct udp_pcb *pcb_cache = NULL; |
| 68 | |
| 69 | void |
| 70 | udp_init(void) |
| 71 | { |
| 72 | udp_pcbs = pcb_cache = NULL; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Process an incoming UDP datagram. |
| 77 | * |
| 78 | * Given an incoming UDP datagram (as a chain of pbufs) this function |
| 79 | * finds a corresponding UDP PCB and |
| 80 | * |
| 81 | * @param pbuf pbuf to be demultiplexed to a UDP PCB. |
| 82 | * @param netif network interface on which the datagram was received. |
| 83 | * |
| 84 | */ |
| 85 | void |
| 86 | udp_input(struct pbuf *p, struct netif *inp) |
| 87 | { |
| 88 | struct udp_hdr *udphdr; |
| 89 | struct udp_pcb *pcb; |
| 90 | struct udp_pcb *uncon_pcb; |
| 91 | struct ip_hdr *iphdr; |
| 92 | u16_t src, dest; |
| 93 | u8_t local_match; |
| 94 | |
| 95 | PERF_START; |
| 96 | |
| 97 | UDP_STATS_INC(udp.recv); |
| 98 | |
| 99 | iphdr = p->payload; |
| 100 | |
| 101 | if (pbuf_header(p, -((s16_t)(UDP_HLEN + IPH_HL(iphdr) * 4)))) { |
| 102 | /* drop short packets */ |
| 103 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len)); |
| 104 | UDP_STATS_INC(udp.lenerr); |
| 105 | UDP_STATS_INC(udp.drop); |
| 106 | snmp_inc_udpinerrors(); |
| 107 | pbuf_free(p); |
| 108 | goto end; |
| 109 | } |
| 110 | |
| 111 | udphdr = (struct udp_hdr *)((u8_t *)p->payload - UDP_HLEN); |
| 112 | |
| 113 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len)); |
| 114 | |
| 115 | src = ntohs(udphdr->src); |
| 116 | dest = ntohs(udphdr->dest); |
| 117 | |
| 118 | udp_debug_print(udphdr); |
| 119 | |
| 120 | /* print the UDP source and destination */ |
| 121 | LWIP_DEBUGF(UDP_DEBUG, ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| 122 | ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest), |
| 123 | ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest), ntohs(udphdr->dest), |
| 124 | ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src), |
| 125 | ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src))); |
| 126 | |
| 127 | local_match = 0; |
| 128 | uncon_pcb = NULL; |
| 129 | /* Iterate through the UDP pcb list for a matching pcb */ |
| 130 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { |
| 131 | /* print the PCB local and remote address */ |
| 132 | LWIP_DEBUGF(UDP_DEBUG, ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| 133 | ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip), |
| 134 | ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port, |
| 135 | ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip), |
| 136 | ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port)); |
| 137 | |
| 138 | /* compare PCB local addr+port to UDP destination addr+port */ |
| 139 | if ((pcb->local_port == dest) && |
| 140 | (ip_addr_isany(&pcb->local_ip) || |
| 141 | ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) { |
| 142 | local_match = 1; |
| 143 | if ((uncon_pcb == NULL) && |
| 144 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) { |
| 145 | /* the first unconnected matching PCB */ |
| 146 | uncon_pcb = pcb; |
| 147 | } |
| 148 | } |
| 149 | /* compare PCB remote addr+port to UDP source addr+port */ |
| 150 | if ((local_match != 0) && |
| 151 | (pcb->remote_port == src) && |
| 152 | (ip_addr_isany(&pcb->remote_ip) || |
| 153 | ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) { |
| 154 | /* the first fully matching PCB */ |
| 155 | break; |
| 156 | } |
| 157 | } |
| 158 | /* no fully matching pcb found? then look for an unconnected pcb */ |
| 159 | if (pcb == NULL) { |
| 160 | pcb = uncon_pcb; |
| 161 | } |
| 162 | |
| 163 | /* Check checksum if this is a match or if it was directed at us. */ |
| 164 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) |
| 165 | { |
| 166 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: calculating checksum\n")); |
| 167 | pbuf_header(p, UDP_HLEN); |
| 168 | #ifdef IPv6 |
| 169 | if (iphdr->nexthdr == IP_PROTO_UDPLITE) { |
| 170 | #else |
| 171 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) { |
| 172 | #endif /* IPv4 */ |
| 173 | /* Do the UDP Lite checksum */ |
| 174 | #if CHECKSUM_CHECK_UDP |
| 175 | if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src), |
| 176 | (struct ip_addr *)&(iphdr->dest), |
| 177 | IP_PROTO_UDPLITE, ntohs(udphdr->len)) != 0) { |
| 178 | LWIP_DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP Lite datagram discarded due to failing checksum\n")); |
| 179 | UDP_STATS_INC(udp.chkerr); |
| 180 | UDP_STATS_INC(udp.drop); |
| 181 | snmp_inc_udpinerrors(); |
| 182 | pbuf_free(p); |
| 183 | goto end; |
| 184 | } |
| 185 | #endif |
| 186 | } else { |
| 187 | #if CHECKSUM_CHECK_UDP |
| 188 | if (udphdr->chksum != 0) { |
| 189 | if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src), |
| 190 | (struct ip_addr *)&(iphdr->dest), |
| 191 | IP_PROTO_UDP, p->tot_len) != 0) { |
| 192 | LWIP_DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP datagram discarded due to failing checksum\n")); |
| 193 | |
| 194 | UDP_STATS_INC(udp.chkerr); |
| 195 | UDP_STATS_INC(udp.drop); |
| 196 | snmp_inc_udpinerrors(); |
| 197 | pbuf_free(p); |
| 198 | goto end; |
| 199 | } |
| 200 | } |
| 201 | #endif |
| 202 | } |
| 203 | pbuf_header(p, -UDP_HLEN); |
| 204 | if (pcb != NULL) { |
| 205 | snmp_inc_udpindatagrams(); |
| 206 | /* callback */ |
| 207 | if (pcb->recv != NULL) |
| 208 | { |
| 209 | pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src); |
| 210 | } |
| 211 | } else { |
| 212 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: not for us.\n")); |
| 213 | |
| 214 | /* No match was found, send ICMP destination port unreachable unless |
| 215 | destination address was broadcast/multicast. */ |
| 216 | |
| 217 | if (!ip_addr_isbroadcast(&iphdr->dest, inp) && |
| 218 | !ip_addr_ismulticast(&iphdr->dest)) { |
| 219 | |
| 220 | /* adjust pbuf pointer */ |
| 221 | p->payload = iphdr; |
| 222 | icmp_dest_unreach(p, ICMP_DUR_PORT); |
| 223 | } |
| 224 | UDP_STATS_INC(udp.proterr); |
| 225 | UDP_STATS_INC(udp.drop); |
| 226 | snmp_inc_udpnoports(); |
| 227 | pbuf_free(p); |
| 228 | } |
| 229 | } else { |
| 230 | pbuf_free(p); |
| 231 | } |
| 232 | end: |
| 233 | |
| 234 | PERF_STOP("udp_input"); |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Send data to a specified address using UDP. |
| 239 | * |
| 240 | * @param pcb UDP PCB used to send the data. |
| 241 | * @param pbuf chain of pbuf's to be sent. |
| 242 | * @param dst_ip Destination IP address. |
| 243 | * @param dst_port Destination UDP port. |
| 244 | * |
| 245 | * If the PCB already has a remote address association, it will |
| 246 | * be restored after the data is sent. |
| 247 | * |
| 248 | * @return lwIP error code. |
| 249 | * - ERR_OK. Successful. No error occured. |
| 250 | * - ERR_MEM. Out of memory. |
| 251 | * - ERR_RTE. Could not find route to destination address. |
| 252 | * |
| 253 | * @see udp_disconnect() udp_send() |
| 254 | */ |
| 255 | err_t |
| 256 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p, |
| 257 | struct ip_addr *dst_ip, u16_t dst_port) |
| 258 | { |
| 259 | err_t err; |
| 260 | /* temporary space for current PCB remote address */ |
| 261 | struct ip_addr pcb_remote_ip; |
| 262 | u16_t pcb_remote_port; |
| 263 | /* remember current remote peer address of PCB */ |
| 264 | pcb_remote_ip.addr = pcb->remote_ip.addr; |
| 265 | pcb_remote_port = pcb->remote_port; |
| 266 | /* copy packet destination address to PCB remote peer address */ |
| 267 | pcb->remote_ip.addr = dst_ip->addr; |
| 268 | pcb->remote_port = dst_port; |
| 269 | /* send to the packet destination address */ |
| 270 | err = udp_send(pcb, p); |
| 271 | /* restore PCB remote peer address */ |
| 272 | pcb->remote_ip.addr = pcb_remote_ip.addr; |
| 273 | pcb->remote_port = pcb_remote_port; |
| 274 | return err; |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Send data using UDP. |
| 279 | * |
| 280 | * @param pcb UDP PCB used to send the data. |
| 281 | * @param pbuf chain of pbuf's to be sent. |
| 282 | * |
| 283 | * @return lwIP error code. |
| 284 | * - ERR_OK. Successful. No error occured. |
| 285 | * - ERR_MEM. Out of memory. |
| 286 | * - ERR_RTE. Could not find route to destination address. |
| 287 | * |
| 288 | * @see udp_disconnect() udp_sendto() |
| 289 | */ |
| 290 | err_t |
| 291 | udp_send(struct udp_pcb *pcb, struct pbuf *p) |
| 292 | { |
| 293 | struct udp_hdr *udphdr; |
| 294 | struct netif *netif; |
| 295 | struct ip_addr *src_ip; |
| 296 | err_t err; |
| 297 | struct pbuf *q; /* q will be sent down the stack */ |
| 298 | |
| 299 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("udp_send\n")); |
| 300 | |
| 301 | /* if the PCB is not yet bound to a port, bind it here */ |
| 302 | if (pcb->local_port == 0) { |
| 303 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: not yet bound to a port, binding now\n")); |
| 304 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| 305 | if (err != ERR_OK) { |
| 306 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: forced port bind failed\n")); |
| 307 | return err; |
| 308 | } |
| 309 | } |
| 310 | /* find the outgoing network interface for this packet */ |
| 311 | netif = ip_route(&(pcb->remote_ip)); |
| 312 | /* no outgoing network interface could be found? */ |
| 313 | if (netif == NULL) { |
| 314 | LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%"X32_F"\n", pcb->remote_ip.addr)); |
| 315 | UDP_STATS_INC(udp.rterr); |
| 316 | return ERR_RTE; |
| 317 | } |
| 318 | |
| 319 | /* not enough space to add an UDP header to first pbuf in given p chain? */ |
| 320 | if (pbuf_header(p, UDP_HLEN)) { |
| 321 | /* allocate header in a seperate new pbuf */ |
| 322 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM); |
| 323 | /* new header pbuf could not be allocated? */ |
| 324 | if (q == NULL) { |
| 325 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: could not allocate header\n")); |
| 326 | return ERR_MEM; |
| 327 | } |
| 328 | /* chain header q in front of given pbuf p */ |
| 329 | pbuf_chain(q, p); |
| 330 | /* { first pbuf q points to header pbuf } */ |
| 331 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); |
| 332 | /* adding a header within p succeeded */ |
| 333 | } else { |
| 334 | /* first pbuf q equals given pbuf */ |
| 335 | q = p; |
| 336 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p)); |
| 337 | } |
| 338 | /* { q now represents the packet to be sent } */ |
| 339 | udphdr = q->payload; |
| 340 | udphdr->src = htons(pcb->local_port); |
| 341 | udphdr->dest = htons(pcb->remote_port); |
| 342 | /* in UDP, 0 checksum means 'no checksum' */ |
| 343 | udphdr->chksum = 0x0000; |
| 344 | |
| 345 | /* PCB local address is IP_ANY_ADDR? */ |
| 346 | if (ip_addr_isany(&pcb->local_ip)) { |
| 347 | /* use outgoing network interface IP address as source address */ |
| 348 | src_ip = &(netif->ip_addr); |
| 349 | } else { |
| 350 | /* use UDP PCB local IP address as source address */ |
| 351 | src_ip = &(pcb->local_ip); |
| 352 | } |
| 353 | |
| 354 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len)); |
| 355 | |
| 356 | /* UDP Lite protocol? */ |
| 357 | if (pcb->flags & UDP_FLAGS_UDPLITE) { |
| 358 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len)); |
| 359 | /* set UDP message length in UDP header */ |
| 360 | udphdr->len = htons(pcb->chksum_len); |
| 361 | /* calculate checksum */ |
| 362 | #if CHECKSUM_GEN_UDP |
| 363 | udphdr->chksum = inet_chksum_pseudo(q, src_ip, &(pcb->remote_ip), |
| 364 | IP_PROTO_UDP, pcb->chksum_len); |
| 365 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| 366 | if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff; |
| 367 | #else |
| 368 | udphdr->chksum = 0x0000; |
| 369 | #endif |
| 370 | /* output to IP */ |
| 371 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n")); |
| 372 | err = ip_output_if (q, src_ip, &pcb->remote_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif); |
| 373 | /* UDP */ |
| 374 | } else { |
| 375 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len)); |
| 376 | udphdr->len = htons(q->tot_len); |
| 377 | /* calculate checksum */ |
| 378 | #if CHECKSUM_GEN_UDP |
| 379 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) { |
| 380 | udphdr->chksum = inet_chksum_pseudo(q, src_ip, &pcb->remote_ip, IP_PROTO_UDP, q->tot_len); |
| 381 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| 382 | if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff; |
| 383 | } |
| 384 | #else |
| 385 | udphdr->chksum = 0x0000; |
| 386 | #endif |
| 387 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum)); |
| 388 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n")); |
| 389 | /* output to IP */ |
| 390 | err = ip_output_if(q, src_ip, &pcb->remote_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif); |
| 391 | } |
| 392 | /* TODO: must this be increased even if error occured? */ |
| 393 | snmp_inc_udpoutdatagrams(); |
| 394 | |
| 395 | /* did we chain a seperate header pbuf earlier? */ |
| 396 | if (q != p) { |
| 397 | /* free the header pbuf */ |
| 398 | pbuf_free(q); q = NULL; |
| 399 | /* { p is still referenced by the caller, and will live on } */ |
| 400 | } |
| 401 | |
| 402 | UDP_STATS_INC(udp.xmit); |
| 403 | return err; |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * Bind an UDP PCB. |
| 408 | * |
| 409 | * @param pcb UDP PCB to be bound with a local address ipaddr and port. |
| 410 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to |
| 411 | * bind to all local interfaces. |
| 412 | * @param port local UDP port to bind with. |
| 413 | * |
| 414 | * @return lwIP error code. |
| 415 | * - ERR_OK. Successful. No error occured. |
| 416 | * - ERR_USE. The specified ipaddr and port are already bound to by |
| 417 | * another UDP PCB. |
| 418 | * |
| 419 | * @see udp_disconnect() |
| 420 | */ |
| 421 | err_t |
| 422 | udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
| 423 | { |
| 424 | struct udp_pcb *ipcb; |
| 425 | u8_t rebind; |
| 426 | |
| 427 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("udp_bind(ipaddr = ")); |
| 428 | ip_addr_debug_print(UDP_DEBUG, ipaddr); |
| 429 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, (", port = %"U16_F")\n", port)); |
| 430 | |
| 431 | rebind = 0; |
| 432 | /* Check for double bind and rebind of the same pcb */ |
| 433 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| 434 | /* is this UDP PCB already on active list? */ |
| 435 | if (pcb == ipcb) { |
| 436 | /* pcb may occur at most once in active list */ |
| 437 | LWIP_ASSERT("rebind == 0", rebind == 0); |
| 438 | /* pcb already in list, just rebind */ |
| 439 | rebind = 1; |
| 440 | } |
| 441 | |
| 442 | /* this code does not allow upper layer to share a UDP port for |
| 443 | listening to broadcast or multicast traffic (See SO_REUSE_ADDR and |
| 444 | SO_REUSE_PORT under *BSD). TODO: See where it fits instead, OR |
| 445 | combine with implementation of UDP PCB flags. Leon Woestenberg. */ |
| 446 | #ifdef LWIP_UDP_TODO |
| 447 | /* port matches that of PCB in list? */ |
| 448 | else if ((ipcb->local_port == port) && |
| 449 | /* IP address matches, or one is IP_ADDR_ANY? */ |
| 450 | (ip_addr_isany(&(ipcb->local_ip)) || |
| 451 | ip_addr_isany(ipaddr) || |
| 452 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) { |
| 453 | /* other PCB already binds to this local IP and port */ |
| 454 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: local port %"U16_F" already bound by another pcb\n", port)); |
| 455 | return ERR_USE; |
| 456 | } |
| 457 | #endif |
| 458 | |
| 459 | } |
| 460 | |
| 461 | ip_addr_set(&pcb->local_ip, ipaddr); |
| 462 | /* no port specified? */ |
| 463 | if (port == 0) { |
| 464 | #ifndef UDP_LOCAL_PORT_RANGE_START |
| 465 | #define UDP_LOCAL_PORT_RANGE_START 4096 |
| 466 | #define UDP_LOCAL_PORT_RANGE_END 0x7fff |
| 467 | #endif |
| 468 | port = UDP_LOCAL_PORT_RANGE_START; |
| 469 | ipcb = udp_pcbs; |
| 470 | while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) { |
| 471 | if (ipcb->local_port == port) { |
| 472 | port++; |
| 473 | ipcb = udp_pcbs; |
| 474 | } else |
| 475 | ipcb = ipcb->next; |
| 476 | } |
| 477 | if (ipcb != NULL) { |
| 478 | /* no more ports available in local range */ |
| 479 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n")); |
| 480 | return ERR_USE; |
| 481 | } |
| 482 | } |
| 483 | pcb->local_port = port; |
| 484 | /* pcb not active yet? */ |
| 485 | if (rebind == 0) { |
| 486 | /* place the PCB on the active list if not already there */ |
| 487 | pcb->next = udp_pcbs; |
| 488 | udp_pcbs = pcb; |
| 489 | } |
| 490 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | DBG_STATE, ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n", |
| 491 | (u16_t)(ntohl(pcb->local_ip.addr) >> 24 & 0xff), |
| 492 | (u16_t)(ntohl(pcb->local_ip.addr) >> 16 & 0xff), |
| 493 | (u16_t)(ntohl(pcb->local_ip.addr) >> 8 & 0xff), |
| 494 | (u16_t)(ntohl(pcb->local_ip.addr) & 0xff), pcb->local_port)); |
| 495 | return ERR_OK; |
| 496 | } |
| 497 | /** |
| 498 | * Connect an UDP PCB. |
| 499 | * |
| 500 | * This will associate the UDP PCB with the remote address. |
| 501 | * |
| 502 | * @param pcb UDP PCB to be connected with remote address ipaddr and port. |
| 503 | * @param ipaddr remote IP address to connect with. |
| 504 | * @param port remote UDP port to connect with. |
| 505 | * |
| 506 | * @return lwIP error code |
| 507 | * |
| 508 | * @see udp_disconnect() |
| 509 | */ |
| 510 | err_t |
| 511 | udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
| 512 | { |
| 513 | struct udp_pcb *ipcb; |
| 514 | |
| 515 | if (pcb->local_port == 0) { |
| 516 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| 517 | if (err != ERR_OK) |
| 518 | return err; |
| 519 | } |
| 520 | |
| 521 | ip_addr_set(&pcb->remote_ip, ipaddr); |
| 522 | pcb->remote_port = port; |
| 523 | pcb->flags |= UDP_FLAGS_CONNECTED; |
| 524 | /** TODO: this functionality belongs in upper layers */ |
| 525 | #ifdef LWIP_UDP_TODO |
| 526 | /* Nail down local IP for netconn_addr()/getsockname() */ |
| 527 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) { |
| 528 | struct netif *netif; |
| 529 | |
| 530 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) { |
| 531 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr)); |
| 532 | UDP_STATS_INC(udp.rterr); |
| 533 | return ERR_RTE; |
| 534 | } |
| 535 | /** TODO: this will bind the udp pcb locally, to the interface which |
| 536 | is used to route output packets to the remote address. However, we |
| 537 | might want to accept incoming packets on any interface! */ |
| 538 | pcb->local_ip = netif->ip_addr; |
| 539 | } else if (ip_addr_isany(&pcb->remote_ip)) { |
| 540 | pcb->local_ip.addr = 0; |
| 541 | } |
| 542 | #endif |
| 543 | LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | DBG_STATE, ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n", |
| 544 | (u16_t)(ntohl(pcb->remote_ip.addr) >> 24 & 0xff), |
| 545 | (u16_t)(ntohl(pcb->remote_ip.addr) >> 16 & 0xff), |
| 546 | (u16_t)(ntohl(pcb->remote_ip.addr) >> 8 & 0xff), |
| 547 | (u16_t)(ntohl(pcb->remote_ip.addr) & 0xff), pcb->remote_port)); |
| 548 | |
| 549 | /* Insert UDP PCB into the list of active UDP PCBs. */ |
| 550 | for(ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| 551 | if (pcb == ipcb) { |
| 552 | /* already on the list, just return */ |
| 553 | return ERR_OK; |
| 554 | } |
| 555 | } |
| 556 | /* PCB not yet on the list, add PCB now */ |
| 557 | pcb->next = udp_pcbs; |
| 558 | udp_pcbs = pcb; |
| 559 | return ERR_OK; |
| 560 | } |
| 561 | |
| 562 | void |
| 563 | udp_disconnect(struct udp_pcb *pcb) |
| 564 | { |
| 565 | /* reset remote address association */ |
| 566 | ip_addr_set(&pcb->remote_ip, IP_ADDR_ANY); |
| 567 | pcb->remote_port = 0; |
| 568 | /* mark PCB as unconnected */ |
| 569 | pcb->flags &= ~UDP_FLAGS_CONNECTED; |
| 570 | } |
| 571 | |
| 572 | void |
| 573 | udp_recv(struct udp_pcb *pcb, |
| 574 | void (* recv)(void *arg, struct udp_pcb *upcb, struct pbuf *p, |
| 575 | struct ip_addr *addr, u16_t port), |
| 576 | void *recv_arg) |
| 577 | { |
| 578 | /* remember recv() callback and user data */ |
| 579 | pcb->recv = recv; |
| 580 | pcb->recv_arg = recv_arg; |
| 581 | } |
| 582 | /** |
| 583 | * Remove an UDP PCB. |
| 584 | * |
| 585 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of |
| 586 | * UDP PCB's and the data structure is freed from memory. |
| 587 | * |
| 588 | * @see udp_new() |
| 589 | */ |
| 590 | void |
| 591 | udp_remove(struct udp_pcb *pcb) |
| 592 | { |
| 593 | struct udp_pcb *pcb2; |
| 594 | /* pcb to be removed is first in list? */ |
| 595 | if (udp_pcbs == pcb) { |
| 596 | /* make list start at 2nd pcb */ |
| 597 | udp_pcbs = udp_pcbs->next; |
| 598 | /* pcb not 1st in list */ |
| 599 | } else for(pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { |
| 600 | /* find pcb in udp_pcbs list */ |
| 601 | if (pcb2->next != NULL && pcb2->next == pcb) { |
| 602 | /* remove pcb from list */ |
| 603 | pcb2->next = pcb->next; |
| 604 | } |
| 605 | } |
| 606 | memp_free(MEMP_UDP_PCB, pcb); |
| 607 | } |
| 608 | /** |
| 609 | * Create a UDP PCB. |
| 610 | * |
| 611 | * @return The UDP PCB which was created. NULL if the PCB data structure |
| 612 | * could not be allocated. |
| 613 | * |
| 614 | * @see udp_remove() |
| 615 | */ |
| 616 | struct udp_pcb * |
| 617 | udp_new(void) { |
| 618 | struct udp_pcb *pcb; |
| 619 | pcb = memp_malloc(MEMP_UDP_PCB); |
| 620 | /* could allocate UDP PCB? */ |
| 621 | if (pcb != NULL) { |
| 622 | /* initialize PCB to all zeroes */ |
| 623 | memset(pcb, 0, sizeof(struct udp_pcb)); |
| 624 | pcb->ttl = UDP_TTL; |
| 625 | } |
| 626 | |
| 627 | |
| 628 | return pcb; |
| 629 | } |
| 630 | |
| 631 | #if UDP_DEBUG |
| 632 | void |
| 633 | udp_debug_print(struct udp_hdr *udphdr) |
| 634 | { |
| 635 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n")); |
| 636 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| 637 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n", |
| 638 | ntohs(udphdr->src), ntohs(udphdr->dest))); |
| 639 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| 640 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n", |
| 641 | ntohs(udphdr->len), ntohs(udphdr->chksum))); |
| 642 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| 643 | } |
| 644 | #endif /* UDP_DEBUG */ |
| 645 | |
| 646 | #endif /* LWIP_UDP */ |
| 647 | |
| 648 | |
| 649 | |
| 650 | |
| 651 | |
| 652 | |
| 653 | |
| 654 | |
| 655 | |