1 /** 2 * @file 3 * Implementation of raw protocol PCBs for low-level handling of 4 * different types of protocols besides (or overriding) those 5 * already available in lwIP.\n 6 * See also @ref raw_raw 7 * 8 * @defgroup raw_raw RAW 9 * @ingroup callbackstyle_api 10 * Implementation of raw protocol PCBs for low-level handling of 11 * different types of protocols besides (or overriding) those 12 * already available in lwIP.\n 13 * @see @ref raw_api 14 */ 15 16 /* 17 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 18 * All rights reserved. 19 * 20 * Redistribution and use in source and binary forms, with or without modification, 21 * are permitted provided that the following conditions are met: 22 * 23 * 1. Redistributions of source code must retain the above copyright notice, 24 * this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright notice, 26 * this list of conditions and the following disclaimer in the documentation 27 * and/or other materials provided with the distribution. 28 * 3. The name of the author may not be used to endorse or promote products 29 * derived from this software without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 40 * OF SUCH DAMAGE. 41 * 42 * This file is part of the lwIP TCP/IP stack. 43 * 44 * Author: Adam Dunkels <adam@sics.se> 45 * 46 */ 47 48 #include "lwip/opt.h" 49 50 #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */ 51 52 #include "lwip/def.h" 53 #include "lwip/memp.h" 54 #include "lwip/ip_addr.h" 55 #include "lwip/netif.h" 56 #include "lwip/raw.h" 57 #include "lwip/stats.h" 58 #include "lwip/ip6.h" 59 #include "lwip/ip6_addr.h" 60 #include "lwip/inet_chksum.h" 61 62 #include <string.h> 63 64 /** The list of RAW PCBs */ 65 static struct raw_pcb *raw_pcbs; 66 67 static u8_t 68 raw_input_local_match(struct raw_pcb *pcb, u8_t broadcast) 69 { 70 LWIP_UNUSED_ARG(broadcast); /* in IPv6 only case */ 71 72 #if LWIP_IPV4 && LWIP_IPV6 73 /* Dual-stack: PCBs listening to any IP type also listen to any IP address */ 74 if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) { 75 #if IP_SOF_BROADCAST_RECV 76 if ((broadcast != 0) && !ip_get_option(pcb, SOF_BROADCAST)) { 77 return 0; 78 } 79 #endif /* IP_SOF_BROADCAST_RECV */ 80 return 1; 81 } 82 #endif /* LWIP_IPV4 && LWIP_IPV6 */ 83 84 /* Only need to check PCB if incoming IP version matches PCB IP version */ 85 if (IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ip_current_dest_addr())) { 86 #if LWIP_IPV4 87 /* Special case: IPv4 broadcast: receive all broadcasts 88 * Note: broadcast variable can only be 1 if it is an IPv4 broadcast */ 89 if (broadcast != 0) { 90 #if IP_SOF_BROADCAST_RECV 91 if (ip_get_option(pcb, SOF_BROADCAST)) 92 #endif /* IP_SOF_BROADCAST_RECV */ 93 { 94 if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) { 95 return 1; 96 } 97 } 98 } else 99 #endif /* LWIP_IPV4 */ 100 /* Handle IPv4 and IPv6: catch all or exact match */ 101 if (ip_addr_isany(&pcb->local_ip) || 102 ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) { 103 return 1; 104 } 105 } 106 107 return 0; 108 } 109 110 /** 111 * Determine if in incoming IP packet is covered by a RAW PCB 112 * and if so, pass it to a user-provided receive callback function. 113 * 114 * Given an incoming IP datagram (as a chain of pbufs) this function 115 * finds a corresponding RAW PCB and calls the corresponding receive 116 * callback function. 117 * 118 * @param p pbuf to be demultiplexed to a RAW PCB. 119 * @param inp network interface on which the datagram was received. 120 * @return - 1 if the packet has been eaten by a RAW PCB receive 121 * callback function. The caller MAY NOT not reference the 122 * packet any longer, and MAY NOT call pbuf_free(). 123 * @return - 0 if packet is not eaten (pbuf is still referenced by the 124 * caller). 125 * 126 */ 127 u8_t 128 raw_input(struct pbuf *p, struct netif *inp) 129 { 130 struct raw_pcb *pcb, *prev; 131 s16_t proto; 132 u8_t eaten = 0; 133 u8_t broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), ip_current_netif()); 134 135 LWIP_UNUSED_ARG(inp); 136 137 #if LWIP_IPV6 138 #if LWIP_IPV4 139 if (IP_HDR_GET_VERSION(p->payload) == 6) 140 #endif /* LWIP_IPV4 */ 141 { 142 struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload; 143 proto = IP6H_NEXTH(ip6hdr); 144 } 145 #if LWIP_IPV4 146 else 147 #endif /* LWIP_IPV4 */ 148 #endif /* LWIP_IPV6 */ 149 #if LWIP_IPV4 150 { 151 proto = IPH_PROTO((struct ip_hdr *)p->payload); 152 } 153 #endif /* LWIP_IPV4 */ 154 155 prev = NULL; 156 pcb = raw_pcbs; 157 /* loop through all raw pcbs until the packet is eaten by one */ 158 /* this allows multiple pcbs to match against the packet by design */ 159 while ((eaten == 0) && (pcb != NULL)) { 160 if ((pcb->protocol == proto) && raw_input_local_match(pcb, broadcast) && 161 (((pcb->flags & RAW_FLAGS_CONNECTED) == 0) || 162 ip_addr_cmp(&pcb->remote_ip, ip_current_src_addr()))) { 163 /* receive callback function available? */ 164 if (pcb->recv != NULL) { 165 #ifndef LWIP_NOASSERT 166 void* old_payload = p->payload; 167 #endif 168 /* the receive callback function did not eat the packet? */ 169 eaten = pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()); 170 if (eaten != 0) { 171 /* receive function ate the packet */ 172 p = NULL; 173 eaten = 1; 174 if (prev != NULL) { 175 /* move the pcb to the front of raw_pcbs so that is 176 found faster next time */ 177 prev->next = pcb->next; 178 pcb->next = raw_pcbs; 179 raw_pcbs = pcb; 180 } 181 } else { 182 /* sanity-check that the receive callback did not alter the pbuf */ 183 LWIP_ASSERT("raw pcb recv callback altered pbuf payload pointer without eating packet", 184 p->payload == old_payload); 185 } 186 } 187 /* no receive callback function was set for this raw PCB */ 188 } 189 /* drop the packet */ 190 prev = pcb; 191 pcb = pcb->next; 192 } 193 return eaten; 194 } 195 196 /** 197 * @ingroup raw_raw 198 * Bind a RAW PCB. 199 * 200 * @param pcb RAW PCB to be bound with a local address ipaddr. 201 * @param ipaddr local IP address to bind with. Use IP4_ADDR_ANY to 202 * bind to all local interfaces. 203 * 204 * @return lwIP error code. 205 * - ERR_OK. Successful. No error occurred. 206 * - ERR_USE. The specified IP address is already bound to by 207 * another RAW PCB. 208 * 209 * @see raw_disconnect() 210 */ 211 err_t 212 raw_bind(struct raw_pcb *pcb, const ip_addr_t *ipaddr) 213 { 214 if ((pcb == NULL) || (ipaddr == NULL)) { 215 return ERR_VAL; 216 } 217 ip_addr_set_ipaddr(&pcb->local_ip, ipaddr); 218 #if LWIP_IPV6 && LWIP_IPV6_SCOPES 219 /* If the given IP address should have a zone but doesn't, assign one now. 220 * This is legacy support: scope-aware callers should always provide properly 221 * zoned source addresses. */ 222 if (IP_IS_V6(&pcb->local_ip) && 223 ip6_addr_lacks_zone(ip_2_ip6(&pcb->local_ip), IP6_UNKNOWN)) { 224 ip6_addr_select_zone(ip_2_ip6(&pcb->local_ip), ip_2_ip6(&pcb->local_ip)); 225 } 226 #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */ 227 return ERR_OK; 228 } 229 230 /** 231 * @ingroup raw_raw 232 * Connect an RAW PCB. This function is required by upper layers 233 * of lwip. Using the raw api you could use raw_sendto() instead 234 * 235 * This will associate the RAW PCB with the remote address. 236 * 237 * @param pcb RAW PCB to be connected with remote address ipaddr and port. 238 * @param ipaddr remote IP address to connect with. 239 * 240 * @return lwIP error code 241 * 242 * @see raw_disconnect() and raw_sendto() 243 */ 244 err_t 245 raw_connect(struct raw_pcb *pcb, const ip_addr_t *ipaddr) 246 { 247 if ((pcb == NULL) || (ipaddr == NULL)) { 248 return ERR_VAL; 249 } 250 ip_addr_set_ipaddr(&pcb->remote_ip, ipaddr); 251 #if LWIP_IPV6 && LWIP_IPV6_SCOPES 252 /* If the given IP address should have a zone but doesn't, assign one now, 253 * using the bound address to make a more informed decision when possible. */ 254 if (IP_IS_V6(&pcb->remote_ip) && 255 ip6_addr_lacks_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNKNOWN)) { 256 ip6_addr_select_zone(ip_2_ip6(&pcb->remote_ip), ip_2_ip6(&pcb->local_ip)); 257 } 258 #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */ 259 pcb->flags |= RAW_FLAGS_CONNECTED; 260 return ERR_OK; 261 } 262 263 /** 264 * @ingroup raw_raw 265 * Disconnect a RAW PCB. 266 * 267 * @param pcb the raw pcb to disconnect. 268 */ 269 void 270 raw_disconnect(struct raw_pcb *pcb) 271 { 272 /* reset remote address association */ 273 #if LWIP_IPV4 && LWIP_IPV6 274 if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) { 275 ip_addr_copy(pcb->remote_ip, *IP_ANY_TYPE); 276 } else { 277 #endif 278 ip_addr_set_any(IP_IS_V6_VAL(pcb->remote_ip), &pcb->remote_ip); 279 #if LWIP_IPV4 && LWIP_IPV6 280 } 281 #endif 282 /* mark PCB as unconnected */ 283 pcb->flags &= ~RAW_FLAGS_CONNECTED; 284 } 285 286 /** 287 * @ingroup raw_raw 288 * Set the callback function for received packets that match the 289 * raw PCB's protocol and binding. 290 * 291 * The callback function MUST either 292 * - eat the packet by calling pbuf_free() and returning non-zero. The 293 * packet will not be passed to other raw PCBs or other protocol layers. 294 * - not free the packet, and return zero. The packet will be matched 295 * against further PCBs and/or forwarded to another protocol layers. 296 */ 297 void 298 raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg) 299 { 300 /* remember recv() callback and user data */ 301 pcb->recv = recv; 302 pcb->recv_arg = recv_arg; 303 } 304 305 /** 306 * @ingroup raw_raw 307 * Send the raw IP packet to the given address. An IP header will be prepended 308 * to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that 309 * case, the packet must include an IP header, which will then be sent as is. 310 * 311 * @param pcb the raw pcb which to send 312 * @param p the IP payload to send 313 * @param ipaddr the destination address of the IP packet 314 * 315 */ 316 err_t 317 raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr) 318 { 319 struct netif *netif; 320 const ip_addr_t *src_ip; 321 322 if ((pcb == NULL) || (ipaddr == NULL) || !IP_ADDR_PCB_VERSION_MATCH(pcb, ipaddr)) { 323 return ERR_VAL; 324 } 325 326 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n")); 327 328 #if LWIP_MULTICAST_TX_OPTIONS 329 netif = NULL; 330 if (ip_addr_ismulticast(ipaddr)) { 331 /* For multicast-destined packets, use the user-provided interface index to 332 * determine the outgoing interface, if an interface index is set and a 333 * matching netif can be found. Otherwise, fall back to regular routing. */ 334 netif = netif_get_by_index(pcb->mcast_ifindex); 335 } 336 337 if (netif == NULL) 338 #endif /* LWIP_MULTICAST_TX_OPTIONS */ 339 { 340 if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) { 341 /* Don't call ip_route() with IP_ANY_TYPE */ 342 netif = ip_route(IP46_ADDR_ANY(IP_GET_TYPE(ipaddr)), ipaddr); 343 } else { 344 netif = ip_route(&pcb->local_ip, ipaddr); 345 } 346 } 347 348 if (netif == NULL) { 349 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to ")); 350 ip_addr_debug_print(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ipaddr); 351 return ERR_RTE; 352 } 353 354 if (ip_addr_isany(&pcb->local_ip) || ip_addr_ismulticast(&pcb->local_ip)) { 355 /* use outgoing network interface IP address as source address */ 356 src_ip = ip_netif_get_local_ip(netif, ipaddr); 357 #if LWIP_IPV6 358 if (src_ip == NULL) { 359 return ERR_RTE; 360 } 361 #endif /* LWIP_IPV6 */ 362 } else { 363 /* use RAW PCB local IP address as source address */ 364 src_ip = &pcb->local_ip; 365 } 366 367 return raw_sendto_if_src(pcb, p, ipaddr, netif, src_ip); 368 } 369 370 /** 371 * @ingroup raw_raw 372 * Send the raw IP packet to the given address, using a particular outgoing 373 * netif and source IP address. An IP header will be prepended to the packet, 374 * unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the 375 * packet must include an IP header, which will then be sent as is. 376 * 377 * @param pcb RAW PCB used to send the data 378 * @param p chain of pbufs to be sent 379 * @param dst_ip destination IP address 380 * @param netif the netif used for sending 381 * @param src_ip source IP address 382 */ 383 err_t 384 raw_sendto_if_src(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, 385 struct netif *netif, const ip_addr_t *src_ip) 386 { 387 err_t err; 388 struct pbuf *q; /* q will be sent down the stack */ 389 s16_t header_size; 390 u8_t ttl; 391 392 if ((pcb == NULL) || (dst_ip == NULL) || (netif == NULL) || (src_ip == NULL) || 393 !IP_ADDR_PCB_VERSION_MATCH(pcb, src_ip) || !IP_ADDR_PCB_VERSION_MATCH(pcb, dst_ip)) { 394 return ERR_VAL; 395 } 396 397 header_size = ( 398 #if LWIP_IPV4 && LWIP_IPV6 399 IP_IS_V6(dst_ip) ? IP6_HLEN : IP_HLEN); 400 #elif LWIP_IPV4 401 IP_HLEN); 402 #else 403 IP6_HLEN); 404 #endif 405 406 /* Handle the HDRINCL option as an exception: none of the code below applies 407 * to this case, and sending the packet needs to be done differently too. */ 408 if (pcb->flags & RAW_FLAGS_HDRINCL) { 409 /* A full header *must* be present in the first pbuf of the chain, as the 410 * output routines may access its fields directly. */ 411 if (p->len < header_size) { 412 return ERR_VAL; 413 } 414 /* @todo multicast loop support, if at all desired for this scenario.. */ 415 NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint); 416 err = ip_output_if_hdrincl(p, src_ip, dst_ip, netif); 417 NETIF_SET_HWADDRHINT(netif, NULL); 418 return err; 419 } 420 421 /* packet too large to add an IP header without causing an overflow? */ 422 if ((u16_t)(p->tot_len + header_size) < p->tot_len) { 423 return ERR_MEM; 424 } 425 /* not enough space to add an IP header to first pbuf in given p chain? */ 426 if (pbuf_header(p, header_size)) { 427 /* allocate header in new pbuf */ 428 q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM); 429 /* new header pbuf could not be allocated? */ 430 if (q == NULL) { 431 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n")); 432 return ERR_MEM; 433 } 434 if (p->tot_len != 0) { 435 /* chain header q in front of given pbuf p */ 436 pbuf_chain(q, p); 437 } 438 /* { first pbuf q points to header pbuf } */ 439 LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); 440 } else { 441 /* first pbuf q equals given pbuf */ 442 q = p; 443 if (pbuf_header(q, -header_size)) { 444 LWIP_ASSERT("Can't restore header we just removed!", 0); 445 return ERR_MEM; 446 } 447 } 448 449 #if IP_SOF_BROADCAST 450 if (IP_IS_V4(dst_ip)) 451 { 452 /* broadcast filter? */ 453 if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) { 454 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb)); 455 /* free any temporary header pbuf allocated by pbuf_header() */ 456 if (q != p) { 457 pbuf_free(q); 458 } 459 return ERR_VAL; 460 } 461 } 462 #endif /* IP_SOF_BROADCAST */ 463 464 /* Multicast Loop? */ 465 #if LWIP_MULTICAST_TX_OPTIONS 466 if (((pcb->flags & RAW_FLAGS_MULTICAST_LOOP) != 0) && ip_addr_ismulticast(dst_ip)) { 467 q->flags |= PBUF_FLAG_MCASTLOOP; 468 } 469 #endif /* LWIP_MULTICAST_TX_OPTIONS */ 470 471 #if LWIP_IPV6 472 /* If requested, based on the IPV6_CHECKSUM socket option per RFC3542, 473 compute the checksum and update the checksum in the payload. */ 474 if (IP_IS_V6(dst_ip) && pcb->chksum_reqd) { 475 u16_t chksum = ip6_chksum_pseudo(p, pcb->protocol, p->tot_len, ip_2_ip6(src_ip), ip_2_ip6(dst_ip)); 476 LWIP_ASSERT("Checksum must fit into first pbuf", p->len >= (pcb->chksum_offset + 2)); 477 SMEMCPY(((u8_t *)p->payload) + pcb->chksum_offset, &chksum, sizeof(u16_t)); 478 } 479 #endif 480 481 /* Determine TTL to use */ 482 #if LWIP_MULTICAST_TX_OPTIONS 483 ttl = (ip_addr_ismulticast(dst_ip) ? raw_get_multicast_ttl(pcb) : pcb->ttl); 484 #else /* LWIP_MULTICAST_TX_OPTIONS */ 485 ttl = pcb->ttl; 486 #endif /* LWIP_MULTICAST_TX_OPTIONS */ 487 488 NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint); 489 err = ip_output_if(q, src_ip, dst_ip, ttl, pcb->tos, pcb->protocol, netif); 490 NETIF_SET_HWADDRHINT(netif, NULL); 491 492 /* did we chain a header earlier? */ 493 if (q != p) { 494 /* free the header */ 495 pbuf_free(q); 496 } 497 return err; 498 } 499 500 /** 501 * @ingroup raw_raw 502 * Send the raw IP packet to the address given by raw_connect() 503 * 504 * @param pcb the raw pcb which to send 505 * @param p the IP payload to send 506 * 507 */ 508 err_t 509 raw_send(struct raw_pcb *pcb, struct pbuf *p) 510 { 511 return raw_sendto(pcb, p, &pcb->remote_ip); 512 } 513 514 /** 515 * @ingroup raw_raw 516 * Remove an RAW PCB. 517 * 518 * @param pcb RAW PCB to be removed. The PCB is removed from the list of 519 * RAW PCB's and the data structure is freed from memory. 520 * 521 * @see raw_new() 522 */ 523 void 524 raw_remove(struct raw_pcb *pcb) 525 { 526 struct raw_pcb *pcb2; 527 /* pcb to be removed is first in list? */ 528 if (raw_pcbs == pcb) { 529 /* make list start at 2nd pcb */ 530 raw_pcbs = raw_pcbs->next; 531 /* pcb not 1st in list */ 532 } else { 533 for (pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { 534 /* find pcb in raw_pcbs list */ 535 if (pcb2->next != NULL && pcb2->next == pcb) { 536 /* remove pcb from list */ 537 pcb2->next = pcb->next; 538 break; 539 } 540 } 541 } 542 memp_free(MEMP_RAW_PCB, pcb); 543 } 544 545 /** 546 * @ingroup raw_raw 547 * Create a RAW PCB. 548 * 549 * @return The RAW PCB which was created. NULL if the PCB data structure 550 * could not be allocated. 551 * 552 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP) 553 * 554 * @see raw_remove() 555 */ 556 struct raw_pcb * 557 raw_new(u8_t proto) 558 { 559 struct raw_pcb *pcb; 560 561 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n")); 562 563 pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB); 564 /* could allocate RAW PCB? */ 565 if (pcb != NULL) { 566 /* initialize PCB to all zeroes */ 567 memset(pcb, 0, sizeof(struct raw_pcb)); 568 pcb->protocol = proto; 569 pcb->ttl = RAW_TTL; 570 #if LWIP_MULTICAST_TX_OPTIONS 571 raw_set_multicast_ttl(pcb, RAW_TTL); 572 #endif /* LWIP_MULTICAST_TX_OPTIONS */ 573 pcb->next = raw_pcbs; 574 raw_pcbs = pcb; 575 } 576 return pcb; 577 } 578 579 /** 580 * @ingroup raw_raw 581 * Create a RAW PCB for specific IP type. 582 * 583 * @return The RAW PCB which was created. NULL if the PCB data structure 584 * could not be allocated. 585 * 586 * @param type IP address type, see @ref lwip_ip_addr_type definitions. 587 * If you want to listen to IPv4 and IPv6 (dual-stack) packets, 588 * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE. 589 * @param proto the protocol number (next header) of the IPv6 packet payload 590 * (e.g. IP6_NEXTH_ICMP6) 591 * 592 * @see raw_remove() 593 */ 594 struct raw_pcb * 595 raw_new_ip_type(u8_t type, u8_t proto) 596 { 597 struct raw_pcb *pcb; 598 pcb = raw_new(proto); 599 #if LWIP_IPV4 && LWIP_IPV6 600 if (pcb != NULL) { 601 IP_SET_TYPE_VAL(pcb->local_ip, type); 602 IP_SET_TYPE_VAL(pcb->remote_ip, type); 603 } 604 #else /* LWIP_IPV4 && LWIP_IPV6 */ 605 LWIP_UNUSED_ARG(type); 606 #endif /* LWIP_IPV4 && LWIP_IPV6 */ 607 return pcb; 608 } 609 610 /** This function is called from netif.c when address is changed 611 * 612 * @param old_addr IP address of the netif before change 613 * @param new_addr IP address of the netif after change 614 */ 615 void raw_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr) 616 { 617 struct raw_pcb* rpcb; 618 619 if (!ip_addr_isany(old_addr) && !ip_addr_isany(new_addr)) { 620 for (rpcb = raw_pcbs; rpcb != NULL; rpcb = rpcb->next) { 621 /* PCB bound to current local interface address? */ 622 if (ip_addr_cmp(&rpcb->local_ip, old_addr)) { 623 /* The PCB is bound to the old ipaddr and 624 * is set to bound to the new one instead */ 625 ip_addr_copy(rpcb->local_ip, *new_addr); 626 } 627 } 628 } 629 } 630 631 #endif /* LWIP_RAW */ 632