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lwip/core/raw.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/**
mbed714	0:d616ece2d859	2	* @file
mbed714	0:d616ece2d859	3	* Implementation of raw protocol PCBs for low-level handling of
mbed714	0:d616ece2d859	4	* different types of protocols besides (or overriding) those
mbed714	0:d616ece2d859	5	* already available in lwIP.
mbed714	0:d616ece2d859	6	*
mbed714	0:d616ece2d859	7	*/
mbed714	0:d616ece2d859	8
mbed714	0:d616ece2d859	9	/*
mbed714	0:d616ece2d859	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:d616ece2d859	11	* All rights reserved.
mbed714	0:d616ece2d859	12	*
mbed714	0:d616ece2d859	13	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	14	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	15	*
mbed714	0:d616ece2d859	16	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	17	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	19	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	20	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	21	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	22	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	23	*
mbed714	0:d616ece2d859	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	33	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	34	*
mbed714	0:d616ece2d859	35	* This file is part of the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	36	*
mbed714	0:d616ece2d859	37	* Author: Adam Dunkels <adam@sics.se>
mbed714	0:d616ece2d859	38	*
mbed714	0:d616ece2d859	39	*/
mbed714	0:d616ece2d859	40
mbed714	0:d616ece2d859	41	#include "lwip/opt.h"
mbed714	0:d616ece2d859	42
mbed714	0:d616ece2d859	43	#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	44
mbed714	0:d616ece2d859	45	#include "lwip/def.h"
mbed714	0:d616ece2d859	46	#include "lwip/memp.h"
mbed714	0:d616ece2d859	47	#include "lwip/ip_addr.h"
mbed714	0:d616ece2d859	48	#include "lwip/netif.h"
mbed714	0:d616ece2d859	49	#include "lwip/raw.h"
mbed714	0:d616ece2d859	50	#include "lwip/stats.h"
mbed714	0:d616ece2d859	51	#include "arch/perf.h"
mbed714	0:d616ece2d859	52
mbed714	0:d616ece2d859	53	#include <string.h>
mbed714	0:d616ece2d859	54
mbed714	0:d616ece2d859	55	/** The list of RAW PCBs */
mbed714	0:d616ece2d859	56	static struct raw_pcb *raw_pcbs;
mbed714	0:d616ece2d859	57
mbed714	0:d616ece2d859	58	/**
mbed714	0:d616ece2d859	59	* Determine if in incoming IP packet is covered by a RAW PCB
mbed714	0:d616ece2d859	60	* and if so, pass it to a user-provided receive callback function.
mbed714	0:d616ece2d859	61	*
mbed714	0:d616ece2d859	62	* Given an incoming IP datagram (as a chain of pbufs) this function
mbed714	0:d616ece2d859	63	* finds a corresponding RAW PCB and calls the corresponding receive
mbed714	0:d616ece2d859	64	* callback function.
mbed714	0:d616ece2d859	65	*
mbed714	0:d616ece2d859	66	* @param p pbuf to be demultiplexed to a RAW PCB.
mbed714	0:d616ece2d859	67	* @param inp network interface on which the datagram was received.
mbed714	0:d616ece2d859	68	* @return - 1 if the packet has been eaten by a RAW PCB receive
mbed714	0:d616ece2d859	69	* callback function. The caller MAY NOT not reference the
mbed714	0:d616ece2d859	70	* packet any longer, and MAY NOT call pbuf_free().
mbed714	0:d616ece2d859	71	* @return - 0 if packet is not eaten (pbuf is still referenced by the
mbed714	0:d616ece2d859	72	* caller).
mbed714	0:d616ece2d859	73	*
mbed714	0:d616ece2d859	74	*/
mbed714	0:d616ece2d859	75	u8_t
mbed714	0:d616ece2d859	76	raw_input(struct pbuf p, struct netif inp)
mbed714	0:d616ece2d859	77	{
mbed714	0:d616ece2d859	78	struct raw_pcb pcb, prev;
mbed714	0:d616ece2d859	79	struct ip_hdr *iphdr;
mbed714	0:d616ece2d859	80	s16_t proto;
mbed714	0:d616ece2d859	81	u8_t eaten = 0;
mbed714	0:d616ece2d859	82
mbed714	0:d616ece2d859	83	LWIP_UNUSED_ARG(inp);
mbed714	0:d616ece2d859	84
mbed714	0:d616ece2d859	85	iphdr = (struct ip_hdr *)p->payload;
mbed714	0:d616ece2d859	86	proto = IPH_PROTO(iphdr);
mbed714	0:d616ece2d859	87
mbed714	0:d616ece2d859	88	prev = NULL;
mbed714	0:d616ece2d859	89	pcb = raw_pcbs;
mbed714	0:d616ece2d859	90	/* loop through all raw pcbs until the packet is eaten by one */
mbed714	0:d616ece2d859	91	/* this allows multiple pcbs to match against the packet by design */
mbed714	0:d616ece2d859	92	while ((eaten == 0) && (pcb != NULL)) {
mbed714	0:d616ece2d859	93	if ((pcb->protocol == proto) &&
mbed714	0:d616ece2d859	94	(ip_addr_isany(&pcb->local_ip) \|\|
mbed714	0:d616ece2d859	95	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest))) {
mbed714	0:d616ece2d859	96	#if IP_SOF_BROADCAST_RECV
mbed714	0:d616ece2d859	97	/* broadcast filter? */
mbed714	0:d616ece2d859	98	if ((pcb->so_options & SOF_BROADCAST) \|\| !ip_addr_isbroadcast(&current_iphdr_dest, inp))
mbed714	0:d616ece2d859	99	#endif /* IP_SOF_BROADCAST_RECV */
mbed714	0:d616ece2d859	100	{
mbed714	0:d616ece2d859	101	/* receive callback function available? */
mbed714	0:d616ece2d859	102	if (pcb->recv != NULL) {
mbed714	0:d616ece2d859	103	/* the receive callback function did not eat the packet? */
mbed714	0:d616ece2d859	104	if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
mbed714	0:d616ece2d859	105	/* receive function ate the packet */
mbed714	0:d616ece2d859	106	p = NULL;
mbed714	0:d616ece2d859	107	eaten = 1;
mbed714	0:d616ece2d859	108	if (prev != NULL) {
mbed714	0:d616ece2d859	109	/* move the pcb to the front of raw_pcbs so that is
mbed714	0:d616ece2d859	110	found faster next time */
mbed714	0:d616ece2d859	111	prev->next = pcb->next;
mbed714	0:d616ece2d859	112	pcb->next = raw_pcbs;
mbed714	0:d616ece2d859	113	raw_pcbs = pcb;
mbed714	0:d616ece2d859	114	}
mbed714	0:d616ece2d859	115	}
mbed714	0:d616ece2d859	116	}
mbed714	0:d616ece2d859	117	/* no receive callback function was set for this raw PCB */
mbed714	0:d616ece2d859	118	}
mbed714	0:d616ece2d859	119	/* drop the packet */
mbed714	0:d616ece2d859	120	}
mbed714	0:d616ece2d859	121	prev = pcb;
mbed714	0:d616ece2d859	122	pcb = pcb->next;
mbed714	0:d616ece2d859	123	}
mbed714	0:d616ece2d859	124	return eaten;
mbed714	0:d616ece2d859	125	}
mbed714	0:d616ece2d859	126
mbed714	0:d616ece2d859	127	/**
mbed714	0:d616ece2d859	128	* Bind a RAW PCB.
mbed714	0:d616ece2d859	129	*
mbed714	0:d616ece2d859	130	* @param pcb RAW PCB to be bound with a local address ipaddr.
mbed714	0:d616ece2d859	131	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
mbed714	0:d616ece2d859	132	* bind to all local interfaces.
mbed714	0:d616ece2d859	133	*
mbed714	0:d616ece2d859	134	* @return lwIP error code.
mbed714	0:d616ece2d859	135	* - ERR_OK. Successful. No error occured.
mbed714	0:d616ece2d859	136	* - ERR_USE. The specified IP address is already bound to by
mbed714	0:d616ece2d859	137	* another RAW PCB.
mbed714	0:d616ece2d859	138	*
mbed714	0:d616ece2d859	139	* @see raw_disconnect()
mbed714	0:d616ece2d859	140	*/
mbed714	0:d616ece2d859	141	err_t
mbed714	0:d616ece2d859	142	raw_bind(struct raw_pcb pcb, ip_addr_t ipaddr)
mbed714	0:d616ece2d859	143	{
mbed714	0:d616ece2d859	144	ip_addr_set(&pcb->local_ip, ipaddr);
mbed714	0:d616ece2d859	145	return ERR_OK;
mbed714	0:d616ece2d859	146	}
mbed714	0:d616ece2d859	147
mbed714	0:d616ece2d859	148	/**
mbed714	0:d616ece2d859	149	* Connect an RAW PCB. This function is required by upper layers
mbed714	0:d616ece2d859	150	* of lwip. Using the raw api you could use raw_sendto() instead
mbed714	0:d616ece2d859	151	*
mbed714	0:d616ece2d859	152	* This will associate the RAW PCB with the remote address.
mbed714	0:d616ece2d859	153	*
mbed714	0:d616ece2d859	154	* @param pcb RAW PCB to be connected with remote address ipaddr and port.
mbed714	0:d616ece2d859	155	* @param ipaddr remote IP address to connect with.
mbed714	0:d616ece2d859	156	*
mbed714	0:d616ece2d859	157	* @return lwIP error code
mbed714	0:d616ece2d859	158	*
mbed714	0:d616ece2d859	159	* @see raw_disconnect() and raw_sendto()
mbed714	0:d616ece2d859	160	*/
mbed714	0:d616ece2d859	161	err_t
mbed714	0:d616ece2d859	162	raw_connect(struct raw_pcb pcb, ip_addr_t ipaddr)
mbed714	0:d616ece2d859	163	{
mbed714	0:d616ece2d859	164	ip_addr_set(&pcb->remote_ip, ipaddr);
mbed714	0:d616ece2d859	165	return ERR_OK;
mbed714	0:d616ece2d859	166	}
mbed714	0:d616ece2d859	167
mbed714	0:d616ece2d859	168
mbed714	0:d616ece2d859	169	/**
mbed714	0:d616ece2d859	170	* Set the callback function for received packets that match the
mbed714	0:d616ece2d859	171	* raw PCB's protocol and binding.
mbed714	0:d616ece2d859	172	*
mbed714	0:d616ece2d859	173	* The callback function MUST either
mbed714	0:d616ece2d859	174	* - eat the packet by calling pbuf_free() and returning non-zero. The
mbed714	0:d616ece2d859	175	* packet will not be passed to other raw PCBs or other protocol layers.
mbed714	0:d616ece2d859	176	* - not free the packet, and return zero. The packet will be matched
mbed714	0:d616ece2d859	177	* against further PCBs and/or forwarded to another protocol layers.
mbed714	0:d616ece2d859	178	*
mbed714	0:d616ece2d859	179	* @return non-zero if the packet was free()d, zero if the packet remains
mbed714	0:d616ece2d859	180	* available for others.
mbed714	0:d616ece2d859	181	*/
mbed714	0:d616ece2d859	182	void
mbed714	0:d616ece2d859	183	raw_recv(struct raw_pcb pcb, raw_recv_fn recv, void recv_arg)
mbed714	0:d616ece2d859	184	{
mbed714	0:d616ece2d859	185	/* remember recv() callback and user data */
mbed714	0:d616ece2d859	186	pcb->recv = recv;
mbed714	0:d616ece2d859	187	pcb->recv_arg = recv_arg;
mbed714	0:d616ece2d859	188	}
mbed714	0:d616ece2d859	189
mbed714	0:d616ece2d859	190	/**
mbed714	0:d616ece2d859	191	* Send the raw IP packet to the given address. Note that actually you cannot
mbed714	0:d616ece2d859	192	* modify the IP headers (this is inconsistent with the receive callback where
mbed714	0:d616ece2d859	193	* you actually get the IP headers), you can only specify the IP payload here.
mbed714	0:d616ece2d859	194	* It requires some more changes in lwIP. (there will be a raw_send() function
mbed714	0:d616ece2d859	195	* then.)
mbed714	0:d616ece2d859	196	*
mbed714	0:d616ece2d859	197	* @param pcb the raw pcb which to send
mbed714	0:d616ece2d859	198	* @param p the IP payload to send
mbed714	0:d616ece2d859	199	* @param ipaddr the destination address of the IP packet
mbed714	0:d616ece2d859	200	*
mbed714	0:d616ece2d859	201	*/
mbed714	0:d616ece2d859	202	err_t
mbed714	0:d616ece2d859	203	raw_sendto(struct raw_pcb pcb, struct pbuf p, ip_addr_t *ipaddr)
mbed714	0:d616ece2d859	204	{
mbed714	0:d616ece2d859	205	err_t err;
mbed714	0:d616ece2d859	206	struct netif *netif;
mbed714	0:d616ece2d859	207	ip_addr_t *src_ip;
mbed714	0:d616ece2d859	208	struct pbuf q; / q will be sent down the stack */
mbed714	0:d616ece2d859	209
mbed714	0:d616ece2d859	210	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_sendto\n"));
mbed714	0:d616ece2d859	211
mbed714	0:d616ece2d859	212	/* not enough space to add an IP header to first pbuf in given p chain? */
mbed714	0:d616ece2d859	213	if (pbuf_header(p, IP_HLEN)) {
mbed714	0:d616ece2d859	214	/* allocate header in new pbuf */
mbed714	0:d616ece2d859	215	q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
mbed714	0:d616ece2d859	216	/* new header pbuf could not be allocated? */
mbed714	0:d616ece2d859	217	if (q == NULL) {
mbed714	0:d616ece2d859	218	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
mbed714	0:d616ece2d859	219	return ERR_MEM;
mbed714	0:d616ece2d859	220	}
mbed714	0:d616ece2d859	221	/* chain header q in front of given pbuf p */
mbed714	0:d616ece2d859	222	pbuf_chain(q, p);
mbed714	0:d616ece2d859	223	/* { first pbuf q points to header pbuf } */
mbed714	0:d616ece2d859	224	LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
mbed714	0:d616ece2d859	225	} else {
mbed714	0:d616ece2d859	226	/* first pbuf q equals given pbuf */
mbed714	0:d616ece2d859	227	q = p;
mbed714	0:d616ece2d859	228	if(pbuf_header(q, -IP_HLEN)) {
mbed714	0:d616ece2d859	229	LWIP_ASSERT("Can't restore header we just removed!", 0);
mbed714	0:d616ece2d859	230	return ERR_MEM;
mbed714	0:d616ece2d859	231	}
mbed714	0:d616ece2d859	232	}
mbed714	0:d616ece2d859	233
mbed714	0:d616ece2d859	234	if ((netif = ip_route(ipaddr)) == NULL) {
mbed714	0:d616ece2d859	235	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed714	0:d616ece2d859	236	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
mbed714	0:d616ece2d859	237	/* free any temporary header pbuf allocated by pbuf_header() */
mbed714	0:d616ece2d859	238	if (q != p) {
mbed714	0:d616ece2d859	239	pbuf_free(q);
mbed714	0:d616ece2d859	240	}
mbed714	0:d616ece2d859	241	return ERR_RTE;
mbed714	0:d616ece2d859	242	}
mbed714	0:d616ece2d859	243
mbed714	0:d616ece2d859	244	#if IP_SOF_BROADCAST
mbed714	0:d616ece2d859	245	/* broadcast filter? */
mbed714	0:d616ece2d859	246	if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
mbed714	0:d616ece2d859	247	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
mbed714	0:d616ece2d859	248	/* free any temporary header pbuf allocated by pbuf_header() */
mbed714	0:d616ece2d859	249	if (q != p) {
mbed714	0:d616ece2d859	250	pbuf_free(q);
mbed714	0:d616ece2d859	251	}
mbed714	0:d616ece2d859	252	return ERR_VAL;
mbed714	0:d616ece2d859	253	}
mbed714	0:d616ece2d859	254	#endif /* IP_SOF_BROADCAST */
mbed714	0:d616ece2d859	255
mbed714	0:d616ece2d859	256	if (ip_addr_isany(&pcb->local_ip)) {
mbed714	0:d616ece2d859	257	/* use outgoing network interface IP address as source address */
mbed714	0:d616ece2d859	258	src_ip = &(netif->ip_addr);
mbed714	0:d616ece2d859	259	} else {
mbed714	0:d616ece2d859	260	/* use RAW PCB local IP address as source address */
mbed714	0:d616ece2d859	261	src_ip = &(pcb->local_ip);
mbed714	0:d616ece2d859	262	}
mbed714	0:d616ece2d859	263
mbed714	0:d616ece2d859	264	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	265	netif->addr_hint = &(pcb->addr_hint);
mbed714	0:d616ece2d859	266	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	267	err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
mbed714	0:d616ece2d859	268	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	269	netif->addr_hint = NULL;
mbed714	0:d616ece2d859	270	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	271
mbed714	0:d616ece2d859	272	/* did we chain a header earlier? */
mbed714	0:d616ece2d859	273	if (q != p) {
mbed714	0:d616ece2d859	274	/* free the header */
mbed714	0:d616ece2d859	275	pbuf_free(q);
mbed714	0:d616ece2d859	276	}
mbed714	0:d616ece2d859	277	return err;
mbed714	0:d616ece2d859	278	}
mbed714	0:d616ece2d859	279
mbed714	0:d616ece2d859	280	/**
mbed714	0:d616ece2d859	281	* Send the raw IP packet to the address given by raw_connect()
mbed714	0:d616ece2d859	282	*
mbed714	0:d616ece2d859	283	* @param pcb the raw pcb which to send
mbed714	0:d616ece2d859	284	* @param p the IP payload to send
mbed714	0:d616ece2d859	285	*
mbed714	0:d616ece2d859	286	*/
mbed714	0:d616ece2d859	287	err_t
mbed714	0:d616ece2d859	288	raw_send(struct raw_pcb pcb, struct pbuf p)
mbed714	0:d616ece2d859	289	{
mbed714	0:d616ece2d859	290	return raw_sendto(pcb, p, &pcb->remote_ip);
mbed714	0:d616ece2d859	291	}
mbed714	0:d616ece2d859	292
mbed714	0:d616ece2d859	293	/**
mbed714	0:d616ece2d859	294	* Remove an RAW PCB.
mbed714	0:d616ece2d859	295	*
mbed714	0:d616ece2d859	296	* @param pcb RAW PCB to be removed. The PCB is removed from the list of
mbed714	0:d616ece2d859	297	* RAW PCB's and the data structure is freed from memory.
mbed714	0:d616ece2d859	298	*
mbed714	0:d616ece2d859	299	* @see raw_new()
mbed714	0:d616ece2d859	300	*/
mbed714	0:d616ece2d859	301	void
mbed714	0:d616ece2d859	302	raw_remove(struct raw_pcb *pcb)
mbed714	0:d616ece2d859	303	{
mbed714	0:d616ece2d859	304	struct raw_pcb *pcb2;
mbed714	0:d616ece2d859	305	/* pcb to be removed is first in list? */
mbed714	0:d616ece2d859	306	if (raw_pcbs == pcb) {
mbed714	0:d616ece2d859	307	/* make list start at 2nd pcb */
mbed714	0:d616ece2d859	308	raw_pcbs = raw_pcbs->next;
mbed714	0:d616ece2d859	309	/* pcb not 1st in list */
mbed714	0:d616ece2d859	310	} else {
mbed714	0:d616ece2d859	311	for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
mbed714	0:d616ece2d859	312	/* find pcb in raw_pcbs list */
mbed714	0:d616ece2d859	313	if (pcb2->next != NULL && pcb2->next == pcb) {
mbed714	0:d616ece2d859	314	/* remove pcb from list */
mbed714	0:d616ece2d859	315	pcb2->next = pcb->next;
mbed714	0:d616ece2d859	316	}
mbed714	0:d616ece2d859	317	}
mbed714	0:d616ece2d859	318	}
mbed714	0:d616ece2d859	319	memp_free(MEMP_RAW_PCB, pcb);
mbed714	0:d616ece2d859	320	}
mbed714	0:d616ece2d859	321
mbed714	0:d616ece2d859	322	/**
mbed714	0:d616ece2d859	323	* Create a RAW PCB.
mbed714	0:d616ece2d859	324	*
mbed714	0:d616ece2d859	325	* @return The RAW PCB which was created. NULL if the PCB data structure
mbed714	0:d616ece2d859	326	* could not be allocated.
mbed714	0:d616ece2d859	327	*
mbed714	0:d616ece2d859	328	* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
mbed714	0:d616ece2d859	329	*
mbed714	0:d616ece2d859	330	* @see raw_remove()
mbed714	0:d616ece2d859	331	*/
mbed714	0:d616ece2d859	332	struct raw_pcb *
mbed714	0:d616ece2d859	333	raw_new(u8_t proto)
mbed714	0:d616ece2d859	334	{
mbed714	0:d616ece2d859	335	struct raw_pcb *pcb;
mbed714	0:d616ece2d859	336
mbed714	0:d616ece2d859	337	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_new\n"));
mbed714	0:d616ece2d859	338
mbed714	0:d616ece2d859	339	pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
mbed714	0:d616ece2d859	340	/* could allocate RAW PCB? */
mbed714	0:d616ece2d859	341	if (pcb != NULL) {
mbed714	0:d616ece2d859	342	/* initialize PCB to all zeroes */
mbed714	0:d616ece2d859	343	memset(pcb, 0, sizeof(struct raw_pcb));
mbed714	0:d616ece2d859	344	pcb->protocol = proto;
mbed714	0:d616ece2d859	345	pcb->ttl = RAW_TTL;
mbed714	0:d616ece2d859	346	pcb->next = raw_pcbs;
mbed714	0:d616ece2d859	347	raw_pcbs = pcb;
mbed714	0:d616ece2d859	348	}
mbed714	0:d616ece2d859	349	return pcb;
mbed714	0:d616ece2d859	350	}
mbed714	0:d616ece2d859	351
mbed714	0:d616ece2d859	352	#endif /* LWIP_RAW */

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/core/raw.c@0:d616ece2d859, 2010-09-18 (annotated)

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