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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP_130/] [src/] [core/] [raw.c] - Blame information for rev 606

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Line No. Rev Author Line
1 606 jeremybenn
/**
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 * @file
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 * Implementation of raw protocol PCBs for low-level handling of
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 * different types of protocols besides (or overriding) those
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 * already available in lwIP.
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 *
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 */
8
 
9
/*
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 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without modification,
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 * are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. The name of the author may not be used to endorse or promote products
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 *    derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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 * OF SUCH DAMAGE.
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 *
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 * This file is part of the lwIP TCP/IP stack.
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 *
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 * Author: Adam Dunkels <adam@sics.se>
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 *
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 */
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#include "lwip/opt.h"
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#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
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#include "lwip/def.h"
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#include "lwip/memp.h"
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#include "lwip/inet.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/raw.h"
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#include "lwip/stats.h"
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#include "lwip/snmp.h"
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#include "arch/perf.h"
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55
#include <string.h>
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57
/** The list of RAW PCBs */
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static struct raw_pcb *raw_pcbs;
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60
/**
61
 * Determine if in incoming IP packet is covered by a RAW PCB
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 * and if so, pass it to a user-provided receive callback function.
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 *
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 * Given an incoming IP datagram (as a chain of pbufs) this function
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 * finds a corresponding RAW PCB and calls the corresponding receive
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 * callback function.
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 *
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 * @param p pbuf to be demultiplexed to a RAW PCB.
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 * @param inp network interface on which the datagram was received.
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 * @return - 1 if the packet has been eaten by a RAW PCB receive
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 *           callback function. The caller MAY NOT not reference the
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 *           packet any longer, and MAY NOT call pbuf_free().
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 * @return - 0 if packet is not eaten (pbuf is still referenced by the
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 *           caller).
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 *
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 */
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u8_t
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raw_input(struct pbuf *p, struct netif *inp)
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{
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  struct raw_pcb *pcb, *prev;
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  struct ip_hdr *iphdr;
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  s16_t proto;
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  u8_t eaten = 0;
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  LWIP_UNUSED_ARG(inp);
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87
  iphdr = p->payload;
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  proto = IPH_PROTO(iphdr);
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90
  prev = NULL;
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  pcb = raw_pcbs;
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  /* loop through all raw pcbs until the packet is eaten by one */
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  /* this allows multiple pcbs to match against the packet by design */
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  while ((eaten == 0) && (pcb != NULL)) {
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    if (pcb->protocol == proto) {
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      /* receive callback function available? */
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      if (pcb->recv != NULL) {
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        /* the receive callback function did not eat the packet? */
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        if (pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src)) != 0)
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        {
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          /* receive function ate the packet */
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          p = NULL;
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          eaten = 1;
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          if (prev != NULL) {
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          /* move the pcb to the front of raw_pcbs so that is
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             found faster next time */
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            prev->next = pcb->next;
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            pcb->next = raw_pcbs;
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            raw_pcbs = pcb;
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          }
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        }
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      }
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      /* no receive callback function was set for this raw PCB */
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      /* drop the packet */
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    }
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    prev = pcb;
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    pcb = pcb->next;
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  }
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  return eaten;
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}
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122
/**
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 * Bind a RAW PCB.
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 *
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 * @param pcb RAW PCB to be bound with a local address ipaddr.
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 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
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 * bind to all local interfaces.
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 *
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 * @return lwIP error code.
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 * - ERR_OK. Successful. No error occured.
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 * - ERR_USE. The specified IP address is already bound to by
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 * another RAW PCB.
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 *
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 * @see raw_disconnect()
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 */
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err_t
137
raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr)
138
{
139
  ip_addr_set(&pcb->local_ip, ipaddr);
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  return ERR_OK;
141
}
142
 
143
/**
144
 * Connect an RAW PCB. This function is required by upper layers
145
 * of lwip. Using the raw api you could use raw_sendto() instead
146
 *
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 * This will associate the RAW PCB with the remote address.
148
 *
149
 * @param pcb RAW PCB to be connected with remote address ipaddr and port.
150
 * @param ipaddr remote IP address to connect with.
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 *
152
 * @return lwIP error code
153
 *
154
 * @see raw_disconnect() and raw_sendto()
155
 */
156
err_t
157
raw_connect(struct raw_pcb *pcb, struct ip_addr *ipaddr)
158
{
159
  ip_addr_set(&pcb->remote_ip, ipaddr);
160
  return ERR_OK;
161
}
162
 
163
 
164
/**
165
 * Set the callback function for received packets that match the
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 * raw PCB's protocol and binding.
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 *
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 * The callback function MUST either
169
 * - eat the packet by calling pbuf_free() and returning non-zero. The
170
 *   packet will not be passed to other raw PCBs or other protocol layers.
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 * - not free the packet, and return zero. The packet will be matched
172
 *   against further PCBs and/or forwarded to another protocol layers.
173
 *
174
 * @return non-zero if the packet was free()d, zero if the packet remains
175
 * available for others.
176
 */
177
void
178
raw_recv(struct raw_pcb *pcb,
179
         u8_t (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p,
180
                      struct ip_addr *addr),
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         void *recv_arg)
182
{
183
  /* remember recv() callback and user data */
184
  pcb->recv = recv;
185
  pcb->recv_arg = recv_arg;
186
}
187
 
188
/**
189
 * Send the raw IP packet to the given address. Note that actually you cannot
190
 * modify the IP headers (this is inconsistent with the receive callback where
191
 * you actually get the IP headers), you can only specify the IP payload here.
192
 * It requires some more changes in lwIP. (there will be a raw_send() function
193
 * then.)
194
 *
195
 * @param pcb the raw pcb which to send
196
 * @param p the IP payload to send
197
 * @param ipaddr the destination address of the IP packet
198
 *
199
 */
200
err_t
201
raw_sendto(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr)
202
{
203
  err_t err;
204
  struct netif *netif;
205
  struct ip_addr *src_ip;
206
  struct pbuf *q; /* q will be sent down the stack */
207
 
208
  LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 3, ("raw_sendto\n"));
209
 
210
  /* not enough space to add an IP header to first pbuf in given p chain? */
211
  if (pbuf_header(p, IP_HLEN)) {
212
    /* allocate header in new pbuf */
213
    q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
214
    /* new header pbuf could not be allocated? */
215
    if (q == NULL) {
216
      LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 2, ("raw_sendto: could not allocate header\n"));
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      return ERR_MEM;
218
    }
219
    /* chain header q in front of given pbuf p */
220
    pbuf_chain(q, p);
221
    /* { first pbuf q points to header pbuf } */
222
    LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
223
  }  else {
224
    /* first pbuf q equals given pbuf */
225
    q = p;
226
    if(pbuf_header(q, -IP_HLEN)) {
227
      LWIP_ASSERT("Can't restore header we just removed!", 0);
228
      return ERR_MEM;
229
    }
230
  }
231
 
232
  if ((netif = ip_route(ipaddr)) == NULL) {
233
    LWIP_DEBUGF(RAW_DEBUG | 1, ("raw_sendto: No route to 0x%"X32_F"\n", ipaddr->addr));
234
    /* free any temporary header pbuf allocated by pbuf_header() */
235
    if (q != p) {
236
      pbuf_free(q);
237
    }
238
    return ERR_RTE;
239
  }
240
 
241
  if (ip_addr_isany(&pcb->local_ip)) {
242
    /* use outgoing network interface IP address as source address */
243
    src_ip = &(netif->ip_addr);
244
  } else {
245
    /* use RAW PCB local IP address as source address */
246
    src_ip = &(pcb->local_ip);
247
  }
248
 
249
#if LWIP_NETIF_HWADDRHINT
250
  netif->addr_hint = &(pcb->addr_hint);
251
#endif /* LWIP_NETIF_HWADDRHINT*/
252
  err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
253
#if LWIP_NETIF_HWADDRHINT
254
  netif->addr_hint = NULL;
255
#endif /* LWIP_NETIF_HWADDRHINT*/
256
 
257
  /* did we chain a header earlier? */
258
  if (q != p) {
259
    /* free the header */
260
    pbuf_free(q);
261
  }
262
  return err;
263
}
264
 
265
/**
266
 * Send the raw IP packet to the address given by raw_connect()
267
 *
268
 * @param pcb the raw pcb which to send
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 * @param p the IP payload to send
270
 *
271
 */
272
err_t
273
raw_send(struct raw_pcb *pcb, struct pbuf *p)
274
{
275
  return raw_sendto(pcb, p, &pcb->remote_ip);
276
}
277
 
278
/**
279
 * Remove an RAW PCB.
280
 *
281
 * @param pcb RAW PCB to be removed. The PCB is removed from the list of
282
 * RAW PCB's and the data structure is freed from memory.
283
 *
284
 * @see raw_new()
285
 */
286
void
287
raw_remove(struct raw_pcb *pcb)
288
{
289
  struct raw_pcb *pcb2;
290
  /* pcb to be removed is first in list? */
291
  if (raw_pcbs == pcb) {
292
    /* make list start at 2nd pcb */
293
    raw_pcbs = raw_pcbs->next;
294
    /* pcb not 1st in list */
295
  } else {
296
    for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
297
      /* find pcb in raw_pcbs list */
298
      if (pcb2->next != NULL && pcb2->next == pcb) {
299
        /* remove pcb from list */
300
        pcb2->next = pcb->next;
301
      }
302
    }
303
  }
304
  memp_free(MEMP_RAW_PCB, pcb);
305
}
306
 
307
/**
308
 * Create a RAW PCB.
309
 *
310
 * @return The RAW PCB which was created. NULL if the PCB data structure
311
 * could not be allocated.
312
 *
313
 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
314
 *
315
 * @see raw_remove()
316
 */
317
struct raw_pcb *
318
raw_new(u8_t proto) {
319
  struct raw_pcb *pcb;
320
 
321
  LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | 3, ("raw_new\n"));
322
 
323
  pcb = memp_malloc(MEMP_RAW_PCB);
324
  /* could allocate RAW PCB? */
325
  if (pcb != NULL) {
326
    /* initialize PCB to all zeroes */
327
    memset(pcb, 0, sizeof(struct raw_pcb));
328
    pcb->protocol = proto;
329
    pcb->ttl = RAW_TTL;
330
    pcb->next = raw_pcbs;
331
    raw_pcbs = pcb;
332
  }
333
  return pcb;
334
}
335
 
336
#endif /* LWIP_RAW */

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