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lwip/core/raw.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * Implementation of raw protocol PCBs for low-level handling of
grzemich 0:d7bd7384a37c 4 * different types of protocols besides (or overriding) those
grzemich 0:d7bd7384a37c 5 * already available in lwIP.
grzemich 0:d7bd7384a37c 6 *
grzemich 0:d7bd7384a37c 7 */
grzemich 0:d7bd7384a37c 8
grzemich 0:d7bd7384a37c 9 /*
grzemich 0:d7bd7384a37c 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
grzemich 0:d7bd7384a37c 11 * All rights reserved.
grzemich 0:d7bd7384a37c 12 *
grzemich 0:d7bd7384a37c 13 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 14 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 15 *
grzemich 0:d7bd7384a37c 16 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 17 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 19 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 20 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 21 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 22 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 23 *
grzemich 0:d7bd7384a37c 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 33 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 34 *
grzemich 0:d7bd7384a37c 35 * This file is part of the lwIP TCP/IP stack.
grzemich 0:d7bd7384a37c 36 *
grzemich 0:d7bd7384a37c 37 * Author: Adam Dunkels <adam@sics.se>
grzemich 0:d7bd7384a37c 38 *
grzemich 0:d7bd7384a37c 39 */
grzemich 0:d7bd7384a37c 40
grzemich 0:d7bd7384a37c 41 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 42
grzemich 0:d7bd7384a37c 43 #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 44
grzemich 0:d7bd7384a37c 45 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 46 #include "lwip/memp.h"
grzemich 0:d7bd7384a37c 47 #include "lwip/ip_addr.h"
grzemich 0:d7bd7384a37c 48 #include "lwip/netif.h"
grzemich 0:d7bd7384a37c 49 #include "lwip/raw.h"
grzemich 0:d7bd7384a37c 50 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 51 #include "arch/perf.h"
grzemich 0:d7bd7384a37c 52
grzemich 0:d7bd7384a37c 53 #include <string.h>
grzemich 0:d7bd7384a37c 54
grzemich 0:d7bd7384a37c 55 /** The list of RAW PCBs */
grzemich 0:d7bd7384a37c 56 static struct raw_pcb *raw_pcbs;
grzemich 0:d7bd7384a37c 57
grzemich 0:d7bd7384a37c 58 /**
grzemich 0:d7bd7384a37c 59 * Determine if in incoming IP packet is covered by a RAW PCB
grzemich 0:d7bd7384a37c 60 * and if so, pass it to a user-provided receive callback function.
grzemich 0:d7bd7384a37c 61 *
grzemich 0:d7bd7384a37c 62 * Given an incoming IP datagram (as a chain of pbufs) this function
grzemich 0:d7bd7384a37c 63 * finds a corresponding RAW PCB and calls the corresponding receive
grzemich 0:d7bd7384a37c 64 * callback function.
grzemich 0:d7bd7384a37c 65 *
grzemich 0:d7bd7384a37c 66 * @param p pbuf to be demultiplexed to a RAW PCB.
grzemich 0:d7bd7384a37c 67 * @param inp network interface on which the datagram was received.
grzemich 0:d7bd7384a37c 68 * @return - 1 if the packet has been eaten by a RAW PCB receive
grzemich 0:d7bd7384a37c 69 * callback function. The caller MAY NOT not reference the
grzemich 0:d7bd7384a37c 70 * packet any longer, and MAY NOT call pbuf_free().
grzemich 0:d7bd7384a37c 71 * @return - 0 if packet is not eaten (pbuf is still referenced by the
grzemich 0:d7bd7384a37c 72 * caller).
grzemich 0:d7bd7384a37c 73 *
grzemich 0:d7bd7384a37c 74 */
grzemich 0:d7bd7384a37c 75 u8_t
grzemich 0:d7bd7384a37c 76 raw_input(struct pbuf *p, struct netif *inp)
grzemich 0:d7bd7384a37c 77 {
grzemich 0:d7bd7384a37c 78 struct raw_pcb *pcb, *prev;
grzemich 0:d7bd7384a37c 79 struct ip_hdr *iphdr;
grzemich 0:d7bd7384a37c 80 s16_t proto;
grzemich 0:d7bd7384a37c 81 u8_t eaten = 0;
grzemich 0:d7bd7384a37c 82
grzemich 0:d7bd7384a37c 83 LWIP_UNUSED_ARG(inp);
grzemich 0:d7bd7384a37c 84
grzemich 0:d7bd7384a37c 85 iphdr = (struct ip_hdr *)p->payload;
grzemich 0:d7bd7384a37c 86 proto = IPH_PROTO(iphdr);
grzemich 0:d7bd7384a37c 87
grzemich 0:d7bd7384a37c 88 prev = NULL;
grzemich 0:d7bd7384a37c 89 pcb = raw_pcbs;
grzemich 0:d7bd7384a37c 90 /* loop through all raw pcbs until the packet is eaten by one */
grzemich 0:d7bd7384a37c 91 /* this allows multiple pcbs to match against the packet by design */
grzemich 0:d7bd7384a37c 92 while ((eaten == 0) && (pcb != NULL)) {
grzemich 0:d7bd7384a37c 93 if ((pcb->protocol == proto) &&
grzemich 0:d7bd7384a37c 94 (ip_addr_isany(&pcb->local_ip) ||
grzemich 0:d7bd7384a37c 95 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest))) {
grzemich 0:d7bd7384a37c 96 #if IP_SOF_BROADCAST_RECV
grzemich 0:d7bd7384a37c 97 /* broadcast filter? */
grzemich 0:d7bd7384a37c 98 if ((pcb->so_options & SOF_BROADCAST) || !ip_addr_isbroadcast(&current_iphdr_dest, inp))
grzemich 0:d7bd7384a37c 99 #endif /* IP_SOF_BROADCAST_RECV */
grzemich 0:d7bd7384a37c 100 {
grzemich 0:d7bd7384a37c 101 /* receive callback function available? */
grzemich 0:d7bd7384a37c 102 if (pcb->recv != NULL) {
grzemich 0:d7bd7384a37c 103 /* the receive callback function did not eat the packet? */
grzemich 0:d7bd7384a37c 104 if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
grzemich 0:d7bd7384a37c 105 /* receive function ate the packet */
grzemich 0:d7bd7384a37c 106 p = NULL;
grzemich 0:d7bd7384a37c 107 eaten = 1;
grzemich 0:d7bd7384a37c 108 if (prev != NULL) {
grzemich 0:d7bd7384a37c 109 /* move the pcb to the front of raw_pcbs so that is
grzemich 0:d7bd7384a37c 110 found faster next time */
grzemich 0:d7bd7384a37c 111 prev->next = pcb->next;
grzemich 0:d7bd7384a37c 112 pcb->next = raw_pcbs;
grzemich 0:d7bd7384a37c 113 raw_pcbs = pcb;
grzemich 0:d7bd7384a37c 114 }
grzemich 0:d7bd7384a37c 115 }
grzemich 0:d7bd7384a37c 116 }
grzemich 0:d7bd7384a37c 117 /* no receive callback function was set for this raw PCB */
grzemich 0:d7bd7384a37c 118 }
grzemich 0:d7bd7384a37c 119 /* drop the packet */
grzemich 0:d7bd7384a37c 120 }
grzemich 0:d7bd7384a37c 121 prev = pcb;
grzemich 0:d7bd7384a37c 122 pcb = pcb->next;
grzemich 0:d7bd7384a37c 123 }
grzemich 0:d7bd7384a37c 124 return eaten;
grzemich 0:d7bd7384a37c 125 }
grzemich 0:d7bd7384a37c 126
grzemich 0:d7bd7384a37c 127 /**
grzemich 0:d7bd7384a37c 128 * Bind a RAW PCB.
grzemich 0:d7bd7384a37c 129 *
grzemich 0:d7bd7384a37c 130 * @param pcb RAW PCB to be bound with a local address ipaddr.
grzemich 0:d7bd7384a37c 131 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
grzemich 0:d7bd7384a37c 132 * bind to all local interfaces.
grzemich 0:d7bd7384a37c 133 *
grzemich 0:d7bd7384a37c 134 * @return lwIP error code.
grzemich 0:d7bd7384a37c 135 * - ERR_OK. Successful. No error occured.
grzemich 0:d7bd7384a37c 136 * - ERR_USE. The specified IP address is already bound to by
grzemich 0:d7bd7384a37c 137 * another RAW PCB.
grzemich 0:d7bd7384a37c 138 *
grzemich 0:d7bd7384a37c 139 * @see raw_disconnect()
grzemich 0:d7bd7384a37c 140 */
grzemich 0:d7bd7384a37c 141 err_t
grzemich 0:d7bd7384a37c 142 raw_bind(struct raw_pcb *pcb, ip_addr_t *ipaddr)
grzemich 0:d7bd7384a37c 143 {
grzemich 0:d7bd7384a37c 144 ip_addr_set(&pcb->local_ip, ipaddr);
grzemich 0:d7bd7384a37c 145 return ERR_OK;
grzemich 0:d7bd7384a37c 146 }
grzemich 0:d7bd7384a37c 147
grzemich 0:d7bd7384a37c 148 /**
grzemich 0:d7bd7384a37c 149 * Connect an RAW PCB. This function is required by upper layers
grzemich 0:d7bd7384a37c 150 * of lwip. Using the raw api you could use raw_sendto() instead
grzemich 0:d7bd7384a37c 151 *
grzemich 0:d7bd7384a37c 152 * This will associate the RAW PCB with the remote address.
grzemich 0:d7bd7384a37c 153 *
grzemich 0:d7bd7384a37c 154 * @param pcb RAW PCB to be connected with remote address ipaddr and port.
grzemich 0:d7bd7384a37c 155 * @param ipaddr remote IP address to connect with.
grzemich 0:d7bd7384a37c 156 *
grzemich 0:d7bd7384a37c 157 * @return lwIP error code
grzemich 0:d7bd7384a37c 158 *
grzemich 0:d7bd7384a37c 159 * @see raw_disconnect() and raw_sendto()
grzemich 0:d7bd7384a37c 160 */
grzemich 0:d7bd7384a37c 161 err_t
grzemich 0:d7bd7384a37c 162 raw_connect(struct raw_pcb *pcb, ip_addr_t *ipaddr)
grzemich 0:d7bd7384a37c 163 {
grzemich 0:d7bd7384a37c 164 ip_addr_set(&pcb->remote_ip, ipaddr);
grzemich 0:d7bd7384a37c 165 return ERR_OK;
grzemich 0:d7bd7384a37c 166 }
grzemich 0:d7bd7384a37c 167
grzemich 0:d7bd7384a37c 168
grzemich 0:d7bd7384a37c 169 /**
grzemich 0:d7bd7384a37c 170 * Set the callback function for received packets that match the
grzemich 0:d7bd7384a37c 171 * raw PCB's protocol and binding.
grzemich 0:d7bd7384a37c 172 *
grzemich 0:d7bd7384a37c 173 * The callback function MUST either
grzemich 0:d7bd7384a37c 174 * - eat the packet by calling pbuf_free() and returning non-zero. The
grzemich 0:d7bd7384a37c 175 * packet will not be passed to other raw PCBs or other protocol layers.
grzemich 0:d7bd7384a37c 176 * - not free the packet, and return zero. The packet will be matched
grzemich 0:d7bd7384a37c 177 * against further PCBs and/or forwarded to another protocol layers.
grzemich 0:d7bd7384a37c 178 *
grzemich 0:d7bd7384a37c 179 * @return non-zero if the packet was free()d, zero if the packet remains
grzemich 0:d7bd7384a37c 180 * available for others.
grzemich 0:d7bd7384a37c 181 */
grzemich 0:d7bd7384a37c 182 void
grzemich 0:d7bd7384a37c 183 raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
grzemich 0:d7bd7384a37c 184 {
grzemich 0:d7bd7384a37c 185 /* remember recv() callback and user data */
grzemich 0:d7bd7384a37c 186 pcb->recv = recv;
grzemich 0:d7bd7384a37c 187 pcb->recv_arg = recv_arg;
grzemich 0:d7bd7384a37c 188 }
grzemich 0:d7bd7384a37c 189
grzemich 0:d7bd7384a37c 190 /**
grzemich 0:d7bd7384a37c 191 * Send the raw IP packet to the given address. Note that actually you cannot
grzemich 0:d7bd7384a37c 192 * modify the IP headers (this is inconsistent with the receive callback where
grzemich 0:d7bd7384a37c 193 * you actually get the IP headers), you can only specify the IP payload here.
grzemich 0:d7bd7384a37c 194 * It requires some more changes in lwIP. (there will be a raw_send() function
grzemich 0:d7bd7384a37c 195 * then.)
grzemich 0:d7bd7384a37c 196 *
grzemich 0:d7bd7384a37c 197 * @param pcb the raw pcb which to send
grzemich 0:d7bd7384a37c 198 * @param p the IP payload to send
grzemich 0:d7bd7384a37c 199 * @param ipaddr the destination address of the IP packet
grzemich 0:d7bd7384a37c 200 *
grzemich 0:d7bd7384a37c 201 */
grzemich 0:d7bd7384a37c 202 err_t
grzemich 0:d7bd7384a37c 203 raw_sendto(struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *ipaddr)
grzemich 0:d7bd7384a37c 204 {
grzemich 0:d7bd7384a37c 205 err_t err;
grzemich 0:d7bd7384a37c 206 struct netif *netif;
grzemich 0:d7bd7384a37c 207 ip_addr_t *src_ip;
grzemich 0:d7bd7384a37c 208 struct pbuf *q; /* q will be sent down the stack */
grzemich 0:d7bd7384a37c 209
grzemich 0:d7bd7384a37c 210 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
grzemich 0:d7bd7384a37c 211
grzemich 0:d7bd7384a37c 212 /* not enough space to add an IP header to first pbuf in given p chain? */
grzemich 0:d7bd7384a37c 213 if (pbuf_header(p, IP_HLEN)) {
grzemich 0:d7bd7384a37c 214 /* allocate header in new pbuf */
grzemich 0:d7bd7384a37c 215 q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
grzemich 0:d7bd7384a37c 216 /* new header pbuf could not be allocated? */
grzemich 0:d7bd7384a37c 217 if (q == NULL) {
grzemich 0:d7bd7384a37c 218 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
grzemich 0:d7bd7384a37c 219 return ERR_MEM;
grzemich 0:d7bd7384a37c 220 }
grzemich 0:d7bd7384a37c 221 if (p->tot_len != 0) {
grzemich 0:d7bd7384a37c 222 /* chain header q in front of given pbuf p */
grzemich 0:d7bd7384a37c 223 pbuf_chain(q, p);
grzemich 0:d7bd7384a37c 224 }
grzemich 0:d7bd7384a37c 225 /* { first pbuf q points to header pbuf } */
grzemich 0:d7bd7384a37c 226 LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
grzemich 0:d7bd7384a37c 227 } else {
grzemich 0:d7bd7384a37c 228 /* first pbuf q equals given pbuf */
grzemich 0:d7bd7384a37c 229 q = p;
grzemich 0:d7bd7384a37c 230 if(pbuf_header(q, -IP_HLEN)) {
grzemich 0:d7bd7384a37c 231 LWIP_ASSERT("Can't restore header we just removed!", 0);
grzemich 0:d7bd7384a37c 232 return ERR_MEM;
grzemich 0:d7bd7384a37c 233 }
grzemich 0:d7bd7384a37c 234 }
grzemich 0:d7bd7384a37c 235
grzemich 0:d7bd7384a37c 236 if ((netif = ip_route(ipaddr)) == NULL) {
grzemich 0:d7bd7384a37c 237 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 238 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
grzemich 0:d7bd7384a37c 239 /* free any temporary header pbuf allocated by pbuf_header() */
grzemich 0:d7bd7384a37c 240 if (q != p) {
grzemich 0:d7bd7384a37c 241 pbuf_free(q);
grzemich 0:d7bd7384a37c 242 }
grzemich 0:d7bd7384a37c 243 return ERR_RTE;
grzemich 0:d7bd7384a37c 244 }
grzemich 0:d7bd7384a37c 245
grzemich 0:d7bd7384a37c 246 #if IP_SOF_BROADCAST
grzemich 0:d7bd7384a37c 247 /* broadcast filter? */
grzemich 0:d7bd7384a37c 248 if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
grzemich 0:d7bd7384a37c 249 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
grzemich 0:d7bd7384a37c 250 /* free any temporary header pbuf allocated by pbuf_header() */
grzemich 0:d7bd7384a37c 251 if (q != p) {
grzemich 0:d7bd7384a37c 252 pbuf_free(q);
grzemich 0:d7bd7384a37c 253 }
grzemich 0:d7bd7384a37c 254 return ERR_VAL;
grzemich 0:d7bd7384a37c 255 }
grzemich 0:d7bd7384a37c 256 #endif /* IP_SOF_BROADCAST */
grzemich 0:d7bd7384a37c 257
grzemich 0:d7bd7384a37c 258 if (ip_addr_isany(&pcb->local_ip)) {
grzemich 0:d7bd7384a37c 259 /* use outgoing network interface IP address as source address */
grzemich 0:d7bd7384a37c 260 src_ip = &(netif->ip_addr);
grzemich 0:d7bd7384a37c 261 } else {
grzemich 0:d7bd7384a37c 262 /* use RAW PCB local IP address as source address */
grzemich 0:d7bd7384a37c 263 src_ip = &(pcb->local_ip);
grzemich 0:d7bd7384a37c 264 }
grzemich 0:d7bd7384a37c 265
grzemich 0:d7bd7384a37c 266 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 267 netif->addr_hint = &(pcb->addr_hint);
grzemich 0:d7bd7384a37c 268 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 269 err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
grzemich 0:d7bd7384a37c 270 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 271 netif->addr_hint = NULL;
grzemich 0:d7bd7384a37c 272 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 273
grzemich 0:d7bd7384a37c 274 /* did we chain a header earlier? */
grzemich 0:d7bd7384a37c 275 if (q != p) {
grzemich 0:d7bd7384a37c 276 /* free the header */
grzemich 0:d7bd7384a37c 277 pbuf_free(q);
grzemich 0:d7bd7384a37c 278 }
grzemich 0:d7bd7384a37c 279 return err;
grzemich 0:d7bd7384a37c 280 }
grzemich 0:d7bd7384a37c 281
grzemich 0:d7bd7384a37c 282 /**
grzemich 0:d7bd7384a37c 283 * Send the raw IP packet to the address given by raw_connect()
grzemich 0:d7bd7384a37c 284 *
grzemich 0:d7bd7384a37c 285 * @param pcb the raw pcb which to send
grzemich 0:d7bd7384a37c 286 * @param p the IP payload to send
grzemich 0:d7bd7384a37c 287 *
grzemich 0:d7bd7384a37c 288 */
grzemich 0:d7bd7384a37c 289 err_t
grzemich 0:d7bd7384a37c 290 raw_send(struct raw_pcb *pcb, struct pbuf *p)
grzemich 0:d7bd7384a37c 291 {
grzemich 0:d7bd7384a37c 292 return raw_sendto(pcb, p, &pcb->remote_ip);
grzemich 0:d7bd7384a37c 293 }
grzemich 0:d7bd7384a37c 294
grzemich 0:d7bd7384a37c 295 /**
grzemich 0:d7bd7384a37c 296 * Remove an RAW PCB.
grzemich 0:d7bd7384a37c 297 *
grzemich 0:d7bd7384a37c 298 * @param pcb RAW PCB to be removed. The PCB is removed from the list of
grzemich 0:d7bd7384a37c 299 * RAW PCB's and the data structure is freed from memory.
grzemich 0:d7bd7384a37c 300 *
grzemich 0:d7bd7384a37c 301 * @see raw_new()
grzemich 0:d7bd7384a37c 302 */
grzemich 0:d7bd7384a37c 303 void
grzemich 0:d7bd7384a37c 304 raw_remove(struct raw_pcb *pcb)
grzemich 0:d7bd7384a37c 305 {
grzemich 0:d7bd7384a37c 306 struct raw_pcb *pcb2;
grzemich 0:d7bd7384a37c 307 /* pcb to be removed is first in list? */
grzemich 0:d7bd7384a37c 308 if (raw_pcbs == pcb) {
grzemich 0:d7bd7384a37c 309 /* make list start at 2nd pcb */
grzemich 0:d7bd7384a37c 310 raw_pcbs = raw_pcbs->next;
grzemich 0:d7bd7384a37c 311 /* pcb not 1st in list */
grzemich 0:d7bd7384a37c 312 } else {
grzemich 0:d7bd7384a37c 313 for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
grzemich 0:d7bd7384a37c 314 /* find pcb in raw_pcbs list */
grzemich 0:d7bd7384a37c 315 if (pcb2->next != NULL && pcb2->next == pcb) {
grzemich 0:d7bd7384a37c 316 /* remove pcb from list */
grzemich 0:d7bd7384a37c 317 pcb2->next = pcb->next;
grzemich 0:d7bd7384a37c 318 }
grzemich 0:d7bd7384a37c 319 }
grzemich 0:d7bd7384a37c 320 }
grzemich 0:d7bd7384a37c 321 memp_free(MEMP_RAW_PCB, pcb);
grzemich 0:d7bd7384a37c 322 }
grzemich 0:d7bd7384a37c 323
grzemich 0:d7bd7384a37c 324 /**
grzemich 0:d7bd7384a37c 325 * Create a RAW PCB.
grzemich 0:d7bd7384a37c 326 *
grzemich 0:d7bd7384a37c 327 * @return The RAW PCB which was created. NULL if the PCB data structure
grzemich 0:d7bd7384a37c 328 * could not be allocated.
grzemich 0:d7bd7384a37c 329 *
grzemich 0:d7bd7384a37c 330 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
grzemich 0:d7bd7384a37c 331 *
grzemich 0:d7bd7384a37c 332 * @see raw_remove()
grzemich 0:d7bd7384a37c 333 */
grzemich 0:d7bd7384a37c 334 struct raw_pcb *
grzemich 0:d7bd7384a37c 335 raw_new(u8_t proto)
grzemich 0:d7bd7384a37c 336 {
grzemich 0:d7bd7384a37c 337 struct raw_pcb *pcb;
grzemich 0:d7bd7384a37c 338
grzemich 0:d7bd7384a37c 339 LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
grzemich 0:d7bd7384a37c 340
grzemich 0:d7bd7384a37c 341 pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
grzemich 0:d7bd7384a37c 342 /* could allocate RAW PCB? */
grzemich 0:d7bd7384a37c 343 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 344 /* initialize PCB to all zeroes */
grzemich 0:d7bd7384a37c 345 memset(pcb, 0, sizeof(struct raw_pcb));
grzemich 0:d7bd7384a37c 346 pcb->protocol = proto;
grzemich 0:d7bd7384a37c 347 pcb->ttl = RAW_TTL;
grzemich 0:d7bd7384a37c 348 pcb->next = raw_pcbs;
grzemich 0:d7bd7384a37c 349 raw_pcbs = pcb;
grzemich 0:d7bd7384a37c 350 }
grzemich 0:d7bd7384a37c 351 return pcb;
grzemich 0:d7bd7384a37c 352 }
grzemich 0:d7bd7384a37c 353
grzemich 0:d7bd7384a37c 354 #endif /* LWIP_RAW */