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lwip/core/raw.c@7:4e2468d7d5cb, 2010-12-15 (annotated)

Committer:: segundo
Date:: Wed Dec 15 18:01:30 2010 +0000
Revision:: 7:4e2468d7d5cb
Parent:: 0:ac1725ba162c

Who changed what in which revision?

User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	/**
segundo	0:ac1725ba162c	2	* @file
segundo	0:ac1725ba162c	3	* Implementation of raw protocol PCBs for low-level handling of
segundo	0:ac1725ba162c	4	* different types of protocols besides (or overriding) those
segundo	0:ac1725ba162c	5	* already available in lwIP.
segundo	0:ac1725ba162c	6	*
segundo	0:ac1725ba162c	7	*/
segundo	0:ac1725ba162c	8
segundo	0:ac1725ba162c	9	/*
segundo	0:ac1725ba162c	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
segundo	0:ac1725ba162c	11	* All rights reserved.
segundo	0:ac1725ba162c	12	*
segundo	0:ac1725ba162c	13	* Redistribution and use in source and binary forms, with or without modification,
segundo	0:ac1725ba162c	14	* are permitted provided that the following conditions are met:
segundo	0:ac1725ba162c	15	*
segundo	0:ac1725ba162c	16	* 1. Redistributions of source code must retain the above copyright notice,
segundo	0:ac1725ba162c	17	* this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
segundo	0:ac1725ba162c	19	* this list of conditions and the following disclaimer in the documentation
segundo	0:ac1725ba162c	20	* and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	21	* 3. The name of the author may not be used to endorse or promote products
segundo	0:ac1725ba162c	22	* derived from this software without specific prior written permission.
segundo	0:ac1725ba162c	23	*
segundo	0:ac1725ba162c	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo	0:ac1725ba162c	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo	0:ac1725ba162c	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo	0:ac1725ba162c	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo	0:ac1725ba162c	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo	0:ac1725ba162c	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo	0:ac1725ba162c	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo	0:ac1725ba162c	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo	0:ac1725ba162c	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo	0:ac1725ba162c	33	* OF SUCH DAMAGE.
segundo	0:ac1725ba162c	34	*
segundo	0:ac1725ba162c	35	* This file is part of the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	36	*
segundo	0:ac1725ba162c	37	* Author: Adam Dunkels <adam@sics.se>
segundo	0:ac1725ba162c	38	*
segundo	0:ac1725ba162c	39	*/
segundo	0:ac1725ba162c	40
segundo	0:ac1725ba162c	41	#include "lwip/opt.h"
segundo	0:ac1725ba162c	42
segundo	0:ac1725ba162c	43	#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
segundo	0:ac1725ba162c	44
segundo	0:ac1725ba162c	45	#include "lwip/def.h"
segundo	0:ac1725ba162c	46	#include "lwip/memp.h"
segundo	0:ac1725ba162c	47	#include "lwip/ip_addr.h"
segundo	0:ac1725ba162c	48	#include "lwip/netif.h"
segundo	0:ac1725ba162c	49	#include "lwip/raw.h"
segundo	0:ac1725ba162c	50	#include "lwip/stats.h"
segundo	0:ac1725ba162c	51	#include "arch/perf.h"
segundo	0:ac1725ba162c	52
segundo	0:ac1725ba162c	53	#include <string.h>
segundo	0:ac1725ba162c	54
segundo	0:ac1725ba162c	55	/** The list of RAW PCBs */
segundo	0:ac1725ba162c	56	static struct raw_pcb *raw_pcbs;
segundo	0:ac1725ba162c	57
segundo	0:ac1725ba162c	58	/**
segundo	0:ac1725ba162c	59	* Determine if in incoming IP packet is covered by a RAW PCB
segundo	0:ac1725ba162c	60	* and if so, pass it to a user-provided receive callback function.
segundo	0:ac1725ba162c	61	*
segundo	0:ac1725ba162c	62	* Given an incoming IP datagram (as a chain of pbufs) this function
segundo	0:ac1725ba162c	63	* finds a corresponding RAW PCB and calls the corresponding receive
segundo	0:ac1725ba162c	64	* callback function.
segundo	0:ac1725ba162c	65	*
segundo	0:ac1725ba162c	66	* @param p pbuf to be demultiplexed to a RAW PCB.
segundo	0:ac1725ba162c	67	* @param inp network interface on which the datagram was received.
segundo	0:ac1725ba162c	68	* @return - 1 if the packet has been eaten by a RAW PCB receive
segundo	0:ac1725ba162c	69	* callback function. The caller MAY NOT not reference the
segundo	0:ac1725ba162c	70	* packet any longer, and MAY NOT call pbuf_free().
segundo	0:ac1725ba162c	71	* @return - 0 if packet is not eaten (pbuf is still referenced by the
segundo	0:ac1725ba162c	72	* caller).
segundo	0:ac1725ba162c	73	*
segundo	0:ac1725ba162c	74	*/
segundo	0:ac1725ba162c	75	u8_t
segundo	0:ac1725ba162c	76	raw_input(struct pbuf p, struct netif inp)
segundo	0:ac1725ba162c	77	{
segundo	0:ac1725ba162c	78	struct raw_pcb pcb, prev;
segundo	0:ac1725ba162c	79	struct ip_hdr *iphdr;
segundo	0:ac1725ba162c	80	s16_t proto;
segundo	0:ac1725ba162c	81	u8_t eaten = 0;
segundo	0:ac1725ba162c	82
segundo	0:ac1725ba162c	83	LWIP_UNUSED_ARG(inp);
segundo	0:ac1725ba162c	84
segundo	0:ac1725ba162c	85	iphdr = (struct ip_hdr *)p->payload;
segundo	0:ac1725ba162c	86	proto = IPH_PROTO(iphdr);
segundo	0:ac1725ba162c	87
segundo	0:ac1725ba162c	88	prev = NULL;
segundo	0:ac1725ba162c	89	pcb = raw_pcbs;
segundo	0:ac1725ba162c	90	/* loop through all raw pcbs until the packet is eaten by one */
segundo	0:ac1725ba162c	91	/* this allows multiple pcbs to match against the packet by design */
segundo	0:ac1725ba162c	92	while ((eaten == 0) && (pcb != NULL)) {
segundo	0:ac1725ba162c	93	if ((pcb->protocol == proto) &&
segundo	0:ac1725ba162c	94	(ip_addr_isany(&pcb->local_ip) \|\|
segundo	0:ac1725ba162c	95	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest))) {
segundo	0:ac1725ba162c	96	#if IP_SOF_BROADCAST_RECV
segundo	0:ac1725ba162c	97	/* broadcast filter? */
segundo	0:ac1725ba162c	98	if ((pcb->so_options & SOF_BROADCAST) \|\| !ip_addr_isbroadcast(&current_iphdr_dest, inp))
segundo	0:ac1725ba162c	99	#endif /* IP_SOF_BROADCAST_RECV */
segundo	0:ac1725ba162c	100	{
segundo	0:ac1725ba162c	101	/* receive callback function available? */
segundo	0:ac1725ba162c	102	if (pcb->recv != NULL) {
segundo	0:ac1725ba162c	103	/* the receive callback function did not eat the packet? */
segundo	0:ac1725ba162c	104	if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
segundo	0:ac1725ba162c	105	/* receive function ate the packet */
segundo	0:ac1725ba162c	106	p = NULL;
segundo	0:ac1725ba162c	107	eaten = 1;
segundo	0:ac1725ba162c	108	if (prev != NULL) {
segundo	0:ac1725ba162c	109	/* move the pcb to the front of raw_pcbs so that is
segundo	0:ac1725ba162c	110	found faster next time */
segundo	0:ac1725ba162c	111	prev->next = pcb->next;
segundo	0:ac1725ba162c	112	pcb->next = raw_pcbs;
segundo	0:ac1725ba162c	113	raw_pcbs = pcb;
segundo	0:ac1725ba162c	114	}
segundo	0:ac1725ba162c	115	}
segundo	0:ac1725ba162c	116	}
segundo	0:ac1725ba162c	117	/* no receive callback function was set for this raw PCB */
segundo	0:ac1725ba162c	118	}
segundo	0:ac1725ba162c	119	/* drop the packet */
segundo	0:ac1725ba162c	120	}
segundo	0:ac1725ba162c	121	prev = pcb;
segundo	0:ac1725ba162c	122	pcb = pcb->next;
segundo	0:ac1725ba162c	123	}
segundo	0:ac1725ba162c	124	return eaten;
segundo	0:ac1725ba162c	125	}
segundo	0:ac1725ba162c	126
segundo	0:ac1725ba162c	127	/**
segundo	0:ac1725ba162c	128	* Bind a RAW PCB.
segundo	0:ac1725ba162c	129	*
segundo	0:ac1725ba162c	130	* @param pcb RAW PCB to be bound with a local address ipaddr.
segundo	0:ac1725ba162c	131	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
segundo	0:ac1725ba162c	132	* bind to all local interfaces.
segundo	0:ac1725ba162c	133	*
segundo	0:ac1725ba162c	134	* @return lwIP error code.
segundo	0:ac1725ba162c	135	* - ERR_OK. Successful. No error occured.
segundo	0:ac1725ba162c	136	* - ERR_USE. The specified IP address is already bound to by
segundo	0:ac1725ba162c	137	* another RAW PCB.
segundo	0:ac1725ba162c	138	*
segundo	0:ac1725ba162c	139	* @see raw_disconnect()
segundo	0:ac1725ba162c	140	*/
segundo	0:ac1725ba162c	141	err_t
segundo	0:ac1725ba162c	142	raw_bind(struct raw_pcb pcb, ip_addr_t ipaddr)
segundo	0:ac1725ba162c	143	{
segundo	0:ac1725ba162c	144	ip_addr_set(&pcb->local_ip, ipaddr);
segundo	0:ac1725ba162c	145	return ERR_OK;
segundo	0:ac1725ba162c	146	}
segundo	0:ac1725ba162c	147
segundo	0:ac1725ba162c	148	/**
segundo	0:ac1725ba162c	149	* Connect an RAW PCB. This function is required by upper layers
segundo	0:ac1725ba162c	150	* of lwip. Using the raw api you could use raw_sendto() instead
segundo	0:ac1725ba162c	151	*
segundo	0:ac1725ba162c	152	* This will associate the RAW PCB with the remote address.
segundo	0:ac1725ba162c	153	*
segundo	0:ac1725ba162c	154	* @param pcb RAW PCB to be connected with remote address ipaddr and port.
segundo	0:ac1725ba162c	155	* @param ipaddr remote IP address to connect with.
segundo	0:ac1725ba162c	156	*
segundo	0:ac1725ba162c	157	* @return lwIP error code
segundo	0:ac1725ba162c	158	*
segundo	0:ac1725ba162c	159	* @see raw_disconnect() and raw_sendto()
segundo	0:ac1725ba162c	160	*/
segundo	0:ac1725ba162c	161	err_t
segundo	0:ac1725ba162c	162	raw_connect(struct raw_pcb pcb, ip_addr_t ipaddr)
segundo	0:ac1725ba162c	163	{
segundo	0:ac1725ba162c	164	ip_addr_set(&pcb->remote_ip, ipaddr);
segundo	0:ac1725ba162c	165	return ERR_OK;
segundo	0:ac1725ba162c	166	}
segundo	0:ac1725ba162c	167
segundo	0:ac1725ba162c	168
segundo	0:ac1725ba162c	169	/**
segundo	0:ac1725ba162c	170	* Set the callback function for received packets that match the
segundo	0:ac1725ba162c	171	* raw PCB's protocol and binding.
segundo	0:ac1725ba162c	172	*
segundo	0:ac1725ba162c	173	* The callback function MUST either
segundo	0:ac1725ba162c	174	* - eat the packet by calling pbuf_free() and returning non-zero. The
segundo	0:ac1725ba162c	175	* packet will not be passed to other raw PCBs or other protocol layers.
segundo	0:ac1725ba162c	176	* - not free the packet, and return zero. The packet will be matched
segundo	0:ac1725ba162c	177	* against further PCBs and/or forwarded to another protocol layers.
segundo	0:ac1725ba162c	178	*
segundo	0:ac1725ba162c	179	* @return non-zero if the packet was free()d, zero if the packet remains
segundo	0:ac1725ba162c	180	* available for others.
segundo	0:ac1725ba162c	181	*/
segundo	0:ac1725ba162c	182	void
segundo	0:ac1725ba162c	183	raw_recv(struct raw_pcb pcb, raw_recv_fn recv, void recv_arg)
segundo	0:ac1725ba162c	184	{
segundo	0:ac1725ba162c	185	/* remember recv() callback and user data */
segundo	0:ac1725ba162c	186	pcb->recv = recv;
segundo	0:ac1725ba162c	187	pcb->recv_arg = recv_arg;
segundo	0:ac1725ba162c	188	}
segundo	0:ac1725ba162c	189
segundo	0:ac1725ba162c	190	/**
segundo	0:ac1725ba162c	191	* Send the raw IP packet to the given address. Note that actually you cannot
segundo	0:ac1725ba162c	192	* modify the IP headers (this is inconsistent with the receive callback where
segundo	0:ac1725ba162c	193	* you actually get the IP headers), you can only specify the IP payload here.
segundo	0:ac1725ba162c	194	* It requires some more changes in lwIP. (there will be a raw_send() function
segundo	0:ac1725ba162c	195	* then.)
segundo	0:ac1725ba162c	196	*
segundo	0:ac1725ba162c	197	* @param pcb the raw pcb which to send
segundo	0:ac1725ba162c	198	* @param p the IP payload to send
segundo	0:ac1725ba162c	199	* @param ipaddr the destination address of the IP packet
segundo	0:ac1725ba162c	200	*
segundo	0:ac1725ba162c	201	*/
segundo	0:ac1725ba162c	202	err_t
segundo	0:ac1725ba162c	203	raw_sendto(struct raw_pcb pcb, struct pbuf p, ip_addr_t *ipaddr)
segundo	0:ac1725ba162c	204	{
segundo	0:ac1725ba162c	205	err_t err;
segundo	0:ac1725ba162c	206	struct netif *netif;
segundo	0:ac1725ba162c	207	ip_addr_t *src_ip;
segundo	0:ac1725ba162c	208	struct pbuf q; / q will be sent down the stack */
segundo	0:ac1725ba162c	209
segundo	0:ac1725ba162c	210	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_sendto\n"));
segundo	0:ac1725ba162c	211
segundo	0:ac1725ba162c	212	/* not enough space to add an IP header to first pbuf in given p chain? */
segundo	0:ac1725ba162c	213	if (pbuf_header(p, IP_HLEN)) {
segundo	0:ac1725ba162c	214	/* allocate header in new pbuf */
segundo	0:ac1725ba162c	215	q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
segundo	0:ac1725ba162c	216	/* new header pbuf could not be allocated? */
segundo	0:ac1725ba162c	217	if (q == NULL) {
segundo	0:ac1725ba162c	218	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
segundo	0:ac1725ba162c	219	return ERR_MEM;
segundo	0:ac1725ba162c	220	}
segundo	0:ac1725ba162c	221	/* chain header q in front of given pbuf p */
segundo	0:ac1725ba162c	222	pbuf_chain(q, p);
segundo	0:ac1725ba162c	223	/* { first pbuf q points to header pbuf } */
segundo	0:ac1725ba162c	224	LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
segundo	0:ac1725ba162c	225	} else {
segundo	0:ac1725ba162c	226	/* first pbuf q equals given pbuf */
segundo	0:ac1725ba162c	227	q = p;
segundo	0:ac1725ba162c	228	if(pbuf_header(q, -IP_HLEN)) {
segundo	0:ac1725ba162c	229	LWIP_ASSERT("Can't restore header we just removed!", 0);
segundo	0:ac1725ba162c	230	return ERR_MEM;
segundo	0:ac1725ba162c	231	}
segundo	0:ac1725ba162c	232	}
segundo	0:ac1725ba162c	233
segundo	0:ac1725ba162c	234	if ((netif = ip_route(ipaddr)) == NULL) {
segundo	0:ac1725ba162c	235	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
segundo	0:ac1725ba162c	236	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
segundo	0:ac1725ba162c	237	/* free any temporary header pbuf allocated by pbuf_header() */
segundo	0:ac1725ba162c	238	if (q != p) {
segundo	0:ac1725ba162c	239	pbuf_free(q);
segundo	0:ac1725ba162c	240	}
segundo	0:ac1725ba162c	241	return ERR_RTE;
segundo	0:ac1725ba162c	242	}
segundo	0:ac1725ba162c	243
segundo	0:ac1725ba162c	244	#if IP_SOF_BROADCAST
segundo	0:ac1725ba162c	245	/* broadcast filter? */
segundo	0:ac1725ba162c	246	if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
segundo	0:ac1725ba162c	247	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
segundo	0:ac1725ba162c	248	/* free any temporary header pbuf allocated by pbuf_header() */
segundo	0:ac1725ba162c	249	if (q != p) {
segundo	0:ac1725ba162c	250	pbuf_free(q);
segundo	0:ac1725ba162c	251	}
segundo	0:ac1725ba162c	252	return ERR_VAL;
segundo	0:ac1725ba162c	253	}
segundo	0:ac1725ba162c	254	#endif /* IP_SOF_BROADCAST */
segundo	0:ac1725ba162c	255
segundo	0:ac1725ba162c	256	if (ip_addr_isany(&pcb->local_ip)) {
segundo	0:ac1725ba162c	257	/* use outgoing network interface IP address as source address */
segundo	0:ac1725ba162c	258	src_ip = &(netif->ip_addr);
segundo	0:ac1725ba162c	259	} else {
segundo	0:ac1725ba162c	260	/* use RAW PCB local IP address as source address */
segundo	0:ac1725ba162c	261	src_ip = &(pcb->local_ip);
segundo	0:ac1725ba162c	262	}
segundo	0:ac1725ba162c	263
segundo	0:ac1725ba162c	264	#if LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	265	netif->addr_hint = &(pcb->addr_hint);
segundo	0:ac1725ba162c	266	#endif /* LWIP_NETIF_HWADDRHINT*/
segundo	0:ac1725ba162c	267	err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
segundo	0:ac1725ba162c	268	#if LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	269	netif->addr_hint = NULL;
segundo	0:ac1725ba162c	270	#endif /* LWIP_NETIF_HWADDRHINT*/
segundo	0:ac1725ba162c	271
segundo	0:ac1725ba162c	272	/* did we chain a header earlier? */
segundo	0:ac1725ba162c	273	if (q != p) {
segundo	0:ac1725ba162c	274	/* free the header */
segundo	0:ac1725ba162c	275	pbuf_free(q);
segundo	0:ac1725ba162c	276	}
segundo	0:ac1725ba162c	277	return err;
segundo	0:ac1725ba162c	278	}
segundo	0:ac1725ba162c	279
segundo	0:ac1725ba162c	280	/**
segundo	0:ac1725ba162c	281	* Send the raw IP packet to the address given by raw_connect()
segundo	0:ac1725ba162c	282	*
segundo	0:ac1725ba162c	283	* @param pcb the raw pcb which to send
segundo	0:ac1725ba162c	284	* @param p the IP payload to send
segundo	0:ac1725ba162c	285	*
segundo	0:ac1725ba162c	286	*/
segundo	0:ac1725ba162c	287	err_t
segundo	0:ac1725ba162c	288	raw_send(struct raw_pcb pcb, struct pbuf p)
segundo	0:ac1725ba162c	289	{
segundo	0:ac1725ba162c	290	return raw_sendto(pcb, p, &pcb->remote_ip);
segundo	0:ac1725ba162c	291	}
segundo	0:ac1725ba162c	292
segundo	0:ac1725ba162c	293	/**
segundo	0:ac1725ba162c	294	* Remove an RAW PCB.
segundo	0:ac1725ba162c	295	*
segundo	0:ac1725ba162c	296	* @param pcb RAW PCB to be removed. The PCB is removed from the list of
segundo	0:ac1725ba162c	297	* RAW PCB's and the data structure is freed from memory.
segundo	0:ac1725ba162c	298	*
segundo	0:ac1725ba162c	299	* @see raw_new()
segundo	0:ac1725ba162c	300	*/
segundo	0:ac1725ba162c	301	void
segundo	0:ac1725ba162c	302	raw_remove(struct raw_pcb *pcb)
segundo	0:ac1725ba162c	303	{
segundo	0:ac1725ba162c	304	struct raw_pcb *pcb2;
segundo	0:ac1725ba162c	305	/* pcb to be removed is first in list? */
segundo	0:ac1725ba162c	306	if (raw_pcbs == pcb) {
segundo	0:ac1725ba162c	307	/* make list start at 2nd pcb */
segundo	0:ac1725ba162c	308	raw_pcbs = raw_pcbs->next;
segundo	0:ac1725ba162c	309	/* pcb not 1st in list */
segundo	0:ac1725ba162c	310	} else {
segundo	0:ac1725ba162c	311	for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
segundo	0:ac1725ba162c	312	/* find pcb in raw_pcbs list */
segundo	0:ac1725ba162c	313	if (pcb2->next != NULL && pcb2->next == pcb) {
segundo	0:ac1725ba162c	314	/* remove pcb from list */
segundo	0:ac1725ba162c	315	pcb2->next = pcb->next;
segundo	0:ac1725ba162c	316	}
segundo	0:ac1725ba162c	317	}
segundo	0:ac1725ba162c	318	}
segundo	0:ac1725ba162c	319	memp_free(MEMP_RAW_PCB, pcb);
segundo	0:ac1725ba162c	320	}
segundo	0:ac1725ba162c	321
segundo	0:ac1725ba162c	322	/**
segundo	0:ac1725ba162c	323	* Create a RAW PCB.
segundo	0:ac1725ba162c	324	*
segundo	0:ac1725ba162c	325	* @return The RAW PCB which was created. NULL if the PCB data structure
segundo	0:ac1725ba162c	326	* could not be allocated.
segundo	0:ac1725ba162c	327	*
segundo	0:ac1725ba162c	328	* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
segundo	0:ac1725ba162c	329	*
segundo	0:ac1725ba162c	330	* @see raw_remove()
segundo	0:ac1725ba162c	331	*/
segundo	0:ac1725ba162c	332	struct raw_pcb *
segundo	0:ac1725ba162c	333	raw_new(u8_t proto)
segundo	0:ac1725ba162c	334	{
segundo	0:ac1725ba162c	335	struct raw_pcb *pcb;
segundo	0:ac1725ba162c	336
segundo	0:ac1725ba162c	337	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_new\n"));
segundo	0:ac1725ba162c	338
segundo	0:ac1725ba162c	339	pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
segundo	0:ac1725ba162c	340	/* could allocate RAW PCB? */
segundo	0:ac1725ba162c	341	if (pcb != NULL) {
segundo	0:ac1725ba162c	342	/* initialize PCB to all zeroes */
segundo	0:ac1725ba162c	343	memset(pcb, 0, sizeof(struct raw_pcb));
segundo	0:ac1725ba162c	344	pcb->protocol = proto;
segundo	0:ac1725ba162c	345	pcb->ttl = RAW_TTL;
segundo	0:ac1725ba162c	346	pcb->next = raw_pcbs;
segundo	0:ac1725ba162c	347	raw_pcbs = pcb;
segundo	0:ac1725ba162c	348	}
segundo	0:ac1725ba162c	349	return pcb;
segundo	0:ac1725ba162c	350	}
segundo	0:ac1725ba162c	351
segundo	0:ac1725ba162c	352	#endif /* LWIP_RAW */

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Type:	Library
Created:	09 Nov 2010
Imports:	3034
Forks:	1
Commits:	8
Dependents:	42
Dependencies:	0
Followers:	27

lwip/core/raw.c@7:4e2468d7d5cb, 2010-12-15 (annotated)

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