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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [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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 *
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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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 */
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/*
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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 <string.h>
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#include "lwip/opt.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 "arch/perf.h"
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#include "lwip/snmp.h"
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#if LWIP_RAW
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/** The list of RAW PCBs */
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static struct raw_pcb *raw_pcbs = NULL;
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void
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raw_init(void)
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{
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  raw_pcbs = NULL;
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}
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/**
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 * 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 pbuf pbuf to be demultiplexed to a RAW PCB.
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 * @param netif 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;
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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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  iphdr = p->payload;
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  proto = IPH_PROTO(iphdr);
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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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        }
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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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    pcb = pcb->next;
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  }
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  return eaten;
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}
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119
/**
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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
134
raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr)
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{
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  ip_addr_set(&pcb->local_ip, ipaddr);
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  return ERR_OK;
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}
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/**
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 * Connect an RAW PCB. This function is required by upper layers
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 * of lwip. Using the raw api you could use raw_sendto() instead
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 *
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 * This will associate the RAW PCB with the remote address.
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 *
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 * @param pcb RAW PCB to be connected with remote address ipaddr and port.
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 * @param ipaddr remote IP address to connect with.
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 *
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 * @return lwIP error code
150
 *
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 * @see raw_disconnect() and raw_sendto()
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 */
153
err_t
154
raw_connect(struct raw_pcb *pcb, struct ip_addr *ipaddr)
155
{
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  ip_addr_set(&pcb->remote_ip, ipaddr);
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  return ERR_OK;
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}
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160
 
161
/**
162
 * 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
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 * - eat the packet by calling pbuf_free() and returning non-zero. The
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 *   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
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 *   against further PCBs and/or forwarded to another protocol layers.
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 *
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 * @return non-zero if the packet was free()d, zero if the packet remains
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 * available for others.
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 */
174
void
175
raw_recv(struct raw_pcb *pcb,
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         u8_t (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p,
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                      struct ip_addr *addr),
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         void *recv_arg)
179
{
180
  /* remember recv() callback and user data */
181
  pcb->recv = recv;
182
  pcb->recv_arg = recv_arg;
183
}
184
 
185
/**
186
 * Send the raw IP packet to the given address. Note that actually you cannot
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 * modify the IP headers (this is inconsistent with the receive callback where
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 * you actually get the IP headers), you can only specify the IP payload here.
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 * It requires some more changes in lwIP. (there will be a raw_send() function
190
 * then.)
191
 *
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 * @param pcb the raw pcb which to send
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 * @param p the IP payload to send
194
 * @param ipaddr the destination address of the IP packet
195
 *
196
 */
197
err_t
198
raw_sendto(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr)
199
{
200
  err_t err;
201
  struct netif *netif;
202
  struct ip_addr *src_ip;
203
  struct pbuf *q; /* q will be sent down the stack */
204
 
205
  LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_sendto\n"));
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207
  /* not enough space to add an IP header to first pbuf in given p chain? */
208
  if (pbuf_header(p, IP_HLEN)) {
209
    /* allocate header in new pbuf */
210
    q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
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    /* new header pbuf could not be allocated? */
212
    if (q == NULL) {
213
      LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 2, ("raw_sendto: could not allocate header\n"));
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      return ERR_MEM;
215
    }
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    /* chain header q in front of given pbuf p */
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    pbuf_chain(q, p);
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    /* { first pbuf q points to header pbuf } */
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    LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
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  }  else {
221
    /* first pbuf q equals given pbuf */
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    q = p;
223
    pbuf_header(q, -IP_HLEN);
224
  }
225
 
226
  if ((netif = ip_route(ipaddr)) == NULL) {
227
    LWIP_DEBUGF(RAW_DEBUG | 1, ("raw_sendto: No route to 0x%"X32_F"\n", ipaddr->addr));
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#if RAW_STATS
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    /*    ++lwip_stats.raw.rterr;*/
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#endif /* RAW_STATS */
231
    /* free any temporary header pbuf allocated by pbuf_header() */
232
    if (q != p) {
233
      pbuf_free(q);
234
    }
235
    return ERR_RTE;
236
  }
237
 
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  if (ip_addr_isany(&pcb->local_ip)) {
239
    /* use outgoing network interface IP address as source address */
240
    src_ip = &(netif->ip_addr);
241
  } else {
242
    /* use RAW PCB local IP address as source address */
243
    src_ip = &(pcb->local_ip);
244
  }
245
 
246
  err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
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248
  /* did we chain a header earlier? */
249
  if (q != p) {
250
    /* free the header */
251
    pbuf_free(q);
252
  }
253
  return err;
254
}
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/**
257
 * Send the raw IP packet to the address given by raw_connect()
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 *
259
 * @param pcb the raw pcb which to send
260
 * @param p the IP payload to send
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 * @param ipaddr the destination address of the IP packet
262
 *
263
 */
264
err_t
265
raw_send(struct raw_pcb *pcb, struct pbuf *p)
266
{
267
  return raw_sendto(pcb, p, &pcb->remote_ip);
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}
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/**
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 * Remove an RAW PCB.
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 *
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 * @param pcb RAW PCB to be removed. The PCB is removed from the list of
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 * RAW PCB's and the data structure is freed from memory.
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 *
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 * @see raw_new()
277
 */
278
void
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raw_remove(struct raw_pcb *pcb)
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{
281
  struct raw_pcb *pcb2;
282
  /* pcb to be removed is first in list? */
283
  if (raw_pcbs == pcb) {
284
    /* make list start at 2nd pcb */
285
    raw_pcbs = raw_pcbs->next;
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    /* pcb not 1st in list */
287
  } else for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
288
    /* find pcb in raw_pcbs list */
289
    if (pcb2->next != NULL && pcb2->next == pcb) {
290
      /* remove pcb from list */
291
      pcb2->next = pcb->next;
292
    }
293
  }
294
  memp_free(MEMP_RAW_PCB, pcb);
295
}
296
 
297
/**
298
 * Create a RAW PCB.
299
 *
300
 * @return The RAW PCB which was created. NULL if the PCB data structure
301
 * could not be allocated.
302
 *
303
 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
304
 *
305
 * @see raw_remove()
306
 */
307
struct raw_pcb *
308
raw_new(u16_t proto) {
309
  struct raw_pcb *pcb;
310
 
311
  LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_new\n"));
312
 
313
  pcb = memp_malloc(MEMP_RAW_PCB);
314
  /* could allocate RAW PCB? */
315
  if (pcb != NULL) {
316
    /* initialize PCB to all zeroes */
317
    memset(pcb, 0, sizeof(struct raw_pcb));
318
    pcb->protocol = proto;
319
    pcb->ttl = RAW_TTL;
320
    pcb->next = raw_pcbs;
321
    raw_pcbs = pcb;
322
  }
323
  return pcb;
324
}
325
 
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#endif /* LWIP_RAW */

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