A version of LWIP, provided for backwards compatibility.
Dependents: AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more
raw.c
00001 /** 00002 * @file 00003 * Implementation of raw protocol PCBs for low-level handling of 00004 * different types of protocols besides (or overriding) those 00005 * already available in lwIP. 00006 * 00007 */ 00008 00009 /* 00010 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00011 * All rights reserved. 00012 * 00013 * Redistribution and use in source and binary forms, with or without modification, 00014 * are permitted provided that the following conditions are met: 00015 * 00016 * 1. Redistributions of source code must retain the above copyright notice, 00017 * this list of conditions and the following disclaimer. 00018 * 2. Redistributions in binary form must reproduce the above copyright notice, 00019 * this list of conditions and the following disclaimer in the documentation 00020 * and/or other materials provided with the distribution. 00021 * 3. The name of the author may not be used to endorse or promote products 00022 * derived from this software without specific prior written permission. 00023 * 00024 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00025 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00026 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00027 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00028 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00029 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00030 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00031 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00032 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00033 * OF SUCH DAMAGE. 00034 * 00035 * This file is part of the lwIP TCP/IP stack. 00036 * 00037 * Author: Adam Dunkels <adam@sics.se> 00038 * 00039 */ 00040 00041 #include "lwip/opt.h" 00042 00043 #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */ 00044 00045 #include "lwip/def.h" 00046 #include "lwip/memp.h" 00047 #include "lwip/inet.h" 00048 #include "lwip/ip_addr.h" 00049 #include "lwip/netif.h" 00050 #include "lwip/raw.h" 00051 #include "lwip/stats.h" 00052 #include "lwip/snmp.h" 00053 #include "arch/perf.h" 00054 00055 #include <string.h> 00056 00057 /** The list of RAW PCBs */ 00058 static struct raw_pcb *raw_pcbs; 00059 00060 /** 00061 * Determine if in incoming IP packet is covered by a RAW PCB 00062 * and if so, pass it to a user-provided receive callback function. 00063 * 00064 * Given an incoming IP datagram (as a chain of pbufs) this function 00065 * finds a corresponding RAW PCB and calls the corresponding receive 00066 * callback function. 00067 * 00068 * @param p pbuf to be demultiplexed to a RAW PCB. 00069 * @param inp network interface on which the datagram was received. 00070 * @return - 1 if the packet has been eaten by a RAW PCB receive 00071 * callback function. The caller MAY NOT not reference the 00072 * packet any longer, and MAY NOT call pbuf_free(). 00073 * @return - 0 if packet is not eaten (pbuf is still referenced by the 00074 * caller). 00075 * 00076 */ 00077 u8_t 00078 raw_input(struct pbuf *p, struct netif *inp) 00079 { 00080 struct raw_pcb *pcb, *prev; 00081 struct ip_hdr *iphdr; 00082 s16_t proto; 00083 u8_t eaten = 0; 00084 00085 LWIP_UNUSED_ARG(inp); 00086 00087 iphdr = static_cast<struct ip_hdr *>(p->payload); 00088 proto = IPH_PROTO(iphdr); 00089 00090 prev = NULL; 00091 pcb = raw_pcbs; 00092 /* loop through all raw pcbs until the packet is eaten by one */ 00093 /* this allows multiple pcbs to match against the packet by design */ 00094 while ((eaten == 0) && (pcb != NULL)) { 00095 if (pcb->protocol == proto) { 00096 /* receive callback function available? */ 00097 if (pcb->recv != NULL) { 00098 /* the receive callback function did not eat the packet? */ 00099 struct ip_addr iphdrsrc; 00100 iphdrsrc.addr = iphdr->src.addr; 00101 if (pcb->recv(pcb->recv_arg, pcb, p, &(iphdrsrc)) != 0) 00102 { 00103 /* receive function ate the packet */ 00104 p = NULL; 00105 eaten = 1; 00106 if (prev != NULL) { 00107 /* move the pcb to the front of raw_pcbs so that is 00108 found faster next time */ 00109 prev->next = pcb->next; 00110 pcb->next = raw_pcbs; 00111 raw_pcbs = pcb; 00112 } 00113 } 00114 } 00115 /* no receive callback function was set for this raw PCB */ 00116 /* drop the packet */ 00117 } 00118 prev = pcb; 00119 pcb = pcb->next; 00120 } 00121 return eaten; 00122 } 00123 00124 /** 00125 * Bind a RAW PCB. 00126 * 00127 * @param pcb RAW PCB to be bound with a local address ipaddr. 00128 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to 00129 * bind to all local interfaces. 00130 * 00131 * @return lwIP error code. 00132 * - ERR_OK. Successful. No error occured. 00133 * - ERR_USE. The specified IP address is already bound to by 00134 * another RAW PCB. 00135 * 00136 * @see raw_disconnect() 00137 */ 00138 err_t 00139 raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr) 00140 { 00141 ip_addr_set(&pcb->local_ip, ipaddr); 00142 return ERR_OK; 00143 } 00144 00145 /** 00146 * Connect an RAW PCB. This function is required by upper layers 00147 * of lwip. Using the raw api you could use raw_sendto() instead 00148 * 00149 * This will associate the RAW PCB with the remote address. 00150 * 00151 * @param pcb RAW PCB to be connected with remote address ipaddr and port. 00152 * @param ipaddr remote IP address to connect with. 00153 * 00154 * @return lwIP error code 00155 * 00156 * @see raw_disconnect() and raw_sendto() 00157 */ 00158 err_t 00159 raw_connect(struct raw_pcb *pcb, struct ip_addr *ipaddr) 00160 { 00161 ip_addr_set(&pcb->remote_ip, ipaddr); 00162 return ERR_OK; 00163 } 00164 00165 00166 /** 00167 * Set the callback function for received packets that match the 00168 * raw PCB's protocol and binding. 00169 * 00170 * The callback function MUST either 00171 * - eat the packet by calling pbuf_free() and returning non-zero. The 00172 * packet will not be passed to other raw PCBs or other protocol layers. 00173 * - not free the packet, and return zero. The packet will be matched 00174 * against further PCBs and/or forwarded to another protocol layers. 00175 * 00176 * @return non-zero if the packet was free()d, zero if the packet remains 00177 * available for others. 00178 */ 00179 void 00180 raw_recv(struct raw_pcb *pcb, 00181 u8_t (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p, 00182 struct ip_addr *addr), 00183 void *recv_arg) 00184 { 00185 /* remember recv() callback and user data */ 00186 pcb->recv = recv; 00187 pcb->recv_arg = recv_arg; 00188 } 00189 00190 /** 00191 * Send the raw IP packet to the given address. Note that actually you cannot 00192 * modify the IP headers (this is inconsistent with the receive callback where 00193 * you actually get the IP headers), you can only specify the IP payload here. 00194 * It requires some more changes in lwIP. (there will be a raw_send() function 00195 * then.) 00196 * 00197 * @param pcb the raw pcb which to send 00198 * @param p the IP payload to send 00199 * @param ipaddr the destination address of the IP packet 00200 * 00201 */ 00202 err_t 00203 raw_sendto(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr) 00204 { 00205 err_t err; 00206 struct netif *netif; 00207 struct ip_addr *src_ip; 00208 struct pbuf *q; /* q will be sent down the stack */ 00209 00210 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 3, ("raw_sendto\n")); 00211 00212 /* not enough space to add an IP header to first pbuf in given p chain? */ 00213 if (pbuf_header(p, IP_HLEN)) { 00214 /* allocate header in new pbuf */ 00215 q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM); 00216 /* new header pbuf could not be allocated? */ 00217 if (q == NULL) { 00218 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 2, ("raw_sendto: could not allocate header\n")); 00219 return ERR_MEM; 00220 } 00221 /* chain header q in front of given pbuf p */ 00222 pbuf_chain(q, p); 00223 /* { first pbuf q points to header pbuf } */ 00224 LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); 00225 } else { 00226 /* first pbuf q equals given pbuf */ 00227 q = p; 00228 if(pbuf_header(q, -IP_HLEN)) { 00229 LWIP_ASSERT("Can't restore header we just removed!", 0); 00230 return ERR_MEM; 00231 } 00232 } 00233 00234 if ((netif = ip_route(ipaddr)) == NULL) { 00235 LWIP_DEBUGF(RAW_DEBUG | 1, ("raw_sendto: No route to 0x%"X32_F"\n", ipaddr->addr)); 00236 /* free any temporary header pbuf allocated by pbuf_header() */ 00237 if (q != p) { 00238 pbuf_free(q); 00239 } 00240 return ERR_RTE; 00241 } 00242 00243 if (ip_addr_isany(&pcb->local_ip)) { 00244 /* use outgoing network interface IP address as source address */ 00245 src_ip = &(netif->ip_addr); 00246 } else { 00247 /* use RAW PCB local IP address as source address */ 00248 src_ip = &(pcb->local_ip); 00249 } 00250 00251 #if LWIP_NETIF_HWADDRHINT 00252 netif->addr_hint = &(pcb->addr_hint); 00253 #endif /* LWIP_NETIF_HWADDRHINT*/ 00254 err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif); 00255 #if LWIP_NETIF_HWADDRHINT 00256 netif->addr_hint = NULL; 00257 #endif /* LWIP_NETIF_HWADDRHINT*/ 00258 00259 /* did we chain a header earlier? */ 00260 if (q != p) { 00261 /* free the header */ 00262 pbuf_free(q); 00263 } 00264 return err; 00265 } 00266 00267 /** 00268 * Send the raw IP packet to the address given by raw_connect() 00269 * 00270 * @param pcb the raw pcb which to send 00271 * @param p the IP payload to send 00272 * 00273 */ 00274 err_t 00275 raw_send(struct raw_pcb *pcb, struct pbuf *p) 00276 { 00277 return raw_sendto(pcb, p, &pcb->remote_ip); 00278 } 00279 00280 /** 00281 * Remove an RAW PCB. 00282 * 00283 * @param pcb RAW PCB to be removed. The PCB is removed from the list of 00284 * RAW PCB's and the data structure is freed from memory. 00285 * 00286 * @see raw_new() 00287 */ 00288 void 00289 raw_remove(struct raw_pcb *pcb) 00290 { 00291 struct raw_pcb *pcb2; 00292 /* pcb to be removed is first in list? */ 00293 if (raw_pcbs == pcb) { 00294 /* make list start at 2nd pcb */ 00295 raw_pcbs = raw_pcbs->next; 00296 /* pcb not 1st in list */ 00297 } else { 00298 for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { 00299 /* find pcb in raw_pcbs list */ 00300 if (pcb2->next != NULL && pcb2->next == pcb) { 00301 /* remove pcb from list */ 00302 pcb2->next = pcb->next; 00303 } 00304 } 00305 } 00306 memp_free(MEMP_RAW_PCB, pcb); 00307 } 00308 00309 /** 00310 * Create a RAW PCB. 00311 * 00312 * @return The RAW PCB which was created. NULL if the PCB data structure 00313 * could not be allocated. 00314 * 00315 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP) 00316 * 00317 * @see raw_remove() 00318 */ 00319 struct raw_pcb * 00320 raw_new(u8_t proto) { 00321 struct raw_pcb *pcb; 00322 00323 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 3, ("raw_new\n")); 00324 00325 pcb = static_cast<struct raw_pcb *>(memp_malloc(MEMP_RAW_PCB)); 00326 /* could allocate RAW PCB? */ 00327 if (pcb != NULL) { 00328 /* initialize PCB to all zeroes */ 00329 memset(pcb, 0, sizeof(struct raw_pcb)); 00330 pcb->protocol = proto; 00331 pcb->ttl = RAW_TTL; 00332 pcb->next = raw_pcbs; 00333 raw_pcbs = pcb; 00334 } 00335 return pcb; 00336 } 00337 00338 #endif /* LWIP_RAW */
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