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NetStack/lwip/core/raw.c@0:1a61c61d0845, 2012-04-03 (annotated)

Committer:: dcoban
Date:: Tue Apr 03 18:43:13 2012 +0000
Revision:: 0:1a61c61d0845

Who changed what in which revision?

User	Revision	Line number	New contents of line
dcoban	0:1a61c61d0845	1	/**
dcoban	0:1a61c61d0845	2	* @file
dcoban	0:1a61c61d0845	3	* Implementation of raw protocol PCBs for low-level handling of
dcoban	0:1a61c61d0845	4	* different types of protocols besides (or overriding) those
dcoban	0:1a61c61d0845	5	* already available in lwIP.
dcoban	0:1a61c61d0845	6	*
dcoban	0:1a61c61d0845	7	*/
dcoban	0:1a61c61d0845	8
dcoban	0:1a61c61d0845	9	/*
dcoban	0:1a61c61d0845	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
dcoban	0:1a61c61d0845	11	* All rights reserved.
dcoban	0:1a61c61d0845	12	*
dcoban	0:1a61c61d0845	13	* Redistribution and use in source and binary forms, with or without modification,
dcoban	0:1a61c61d0845	14	* are permitted provided that the following conditions are met:
dcoban	0:1a61c61d0845	15	*
dcoban	0:1a61c61d0845	16	* 1. Redistributions of source code must retain the above copyright notice,
dcoban	0:1a61c61d0845	17	* this list of conditions and the following disclaimer.
dcoban	0:1a61c61d0845	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
dcoban	0:1a61c61d0845	19	* this list of conditions and the following disclaimer in the documentation
dcoban	0:1a61c61d0845	20	* and/or other materials provided with the distribution.
dcoban	0:1a61c61d0845	21	* 3. The name of the author may not be used to endorse or promote products
dcoban	0:1a61c61d0845	22	* derived from this software without specific prior written permission.
dcoban	0:1a61c61d0845	23	*
dcoban	0:1a61c61d0845	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
dcoban	0:1a61c61d0845	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
dcoban	0:1a61c61d0845	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
dcoban	0:1a61c61d0845	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
dcoban	0:1a61c61d0845	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
dcoban	0:1a61c61d0845	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dcoban	0:1a61c61d0845	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dcoban	0:1a61c61d0845	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
dcoban	0:1a61c61d0845	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
dcoban	0:1a61c61d0845	33	* OF SUCH DAMAGE.
dcoban	0:1a61c61d0845	34	*
dcoban	0:1a61c61d0845	35	* This file is part of the lwIP TCP/IP stack.
dcoban	0:1a61c61d0845	36	*
dcoban	0:1a61c61d0845	37	* Author: Adam Dunkels <adam@sics.se>
dcoban	0:1a61c61d0845	38	*
dcoban	0:1a61c61d0845	39	*/
dcoban	0:1a61c61d0845	40
dcoban	0:1a61c61d0845	41	#include "lwip/opt.h"
dcoban	0:1a61c61d0845	42
dcoban	0:1a61c61d0845	43	#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
dcoban	0:1a61c61d0845	44
dcoban	0:1a61c61d0845	45	#include "lwip/def.h"
dcoban	0:1a61c61d0845	46	#include "lwip/memp.h"
dcoban	0:1a61c61d0845	47	#include "lwip/ip_addr.h"
dcoban	0:1a61c61d0845	48	#include "lwip/netif.h"
dcoban	0:1a61c61d0845	49	#include "lwip/raw.h"
dcoban	0:1a61c61d0845	50	#include "lwip/stats.h"
dcoban	0:1a61c61d0845	51	#include "arch/perf.h"
dcoban	0:1a61c61d0845	52
dcoban	0:1a61c61d0845	53	#include <string.h>
dcoban	0:1a61c61d0845	54
dcoban	0:1a61c61d0845	55	/** The list of RAW PCBs */
dcoban	0:1a61c61d0845	56	static struct raw_pcb *raw_pcbs;
dcoban	0:1a61c61d0845	57
dcoban	0:1a61c61d0845	58	/**
dcoban	0:1a61c61d0845	59	* Determine if in incoming IP packet is covered by a RAW PCB
dcoban	0:1a61c61d0845	60	* and if so, pass it to a user-provided receive callback function.
dcoban	0:1a61c61d0845	61	*
dcoban	0:1a61c61d0845	62	* Given an incoming IP datagram (as a chain of pbufs) this function
dcoban	0:1a61c61d0845	63	* finds a corresponding RAW PCB and calls the corresponding receive
dcoban	0:1a61c61d0845	64	* callback function.
dcoban	0:1a61c61d0845	65	*
dcoban	0:1a61c61d0845	66	* @param p pbuf to be demultiplexed to a RAW PCB.
dcoban	0:1a61c61d0845	67	* @param inp network interface on which the datagram was received.
dcoban	0:1a61c61d0845	68	* @return - 1 if the packet has been eaten by a RAW PCB receive
dcoban	0:1a61c61d0845	69	* callback function. The caller MAY NOT not reference the
dcoban	0:1a61c61d0845	70	* packet any longer, and MAY NOT call pbuf_free().
dcoban	0:1a61c61d0845	71	* @return - 0 if packet is not eaten (pbuf is still referenced by the
dcoban	0:1a61c61d0845	72	* caller).
dcoban	0:1a61c61d0845	73	*
dcoban	0:1a61c61d0845	74	*/
dcoban	0:1a61c61d0845	75	u8_t
dcoban	0:1a61c61d0845	76	raw_input(struct pbuf p, struct netif inp)
dcoban	0:1a61c61d0845	77	{
dcoban	0:1a61c61d0845	78	struct raw_pcb pcb, prev;
dcoban	0:1a61c61d0845	79	struct ip_hdr *iphdr;
dcoban	0:1a61c61d0845	80	s16_t proto;
dcoban	0:1a61c61d0845	81	u8_t eaten = 0;
dcoban	0:1a61c61d0845	82
dcoban	0:1a61c61d0845	83	LWIP_UNUSED_ARG(inp);
dcoban	0:1a61c61d0845	84
dcoban	0:1a61c61d0845	85	iphdr = (struct ip_hdr *)p->payload;
dcoban	0:1a61c61d0845	86	proto = IPH_PROTO(iphdr);
dcoban	0:1a61c61d0845	87
dcoban	0:1a61c61d0845	88	prev = NULL;
dcoban	0:1a61c61d0845	89	pcb = raw_pcbs;
dcoban	0:1a61c61d0845	90	/* loop through all raw pcbs until the packet is eaten by one */
dcoban	0:1a61c61d0845	91	/* this allows multiple pcbs to match against the packet by design */
dcoban	0:1a61c61d0845	92	while ((eaten == 0) && (pcb != NULL)) {
dcoban	0:1a61c61d0845	93	if ((pcb->protocol == proto) &&
dcoban	0:1a61c61d0845	94	(ip_addr_isany(&pcb->local_ip) \|\|
dcoban	0:1a61c61d0845	95	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest))) {
dcoban	0:1a61c61d0845	96	#if IP_SOF_BROADCAST_RECV
dcoban	0:1a61c61d0845	97	/* broadcast filter? */
dcoban	0:1a61c61d0845	98	if ((pcb->so_options & SOF_BROADCAST) \|\| !ip_addr_isbroadcast(&current_iphdr_dest, inp))
dcoban	0:1a61c61d0845	99	#endif /* IP_SOF_BROADCAST_RECV */
dcoban	0:1a61c61d0845	100	{
dcoban	0:1a61c61d0845	101	/* receive callback function available? */
dcoban	0:1a61c61d0845	102	if (pcb->recv != NULL) {
dcoban	0:1a61c61d0845	103	/* the receive callback function did not eat the packet? */
dcoban	0:1a61c61d0845	104	if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
dcoban	0:1a61c61d0845	105	/* receive function ate the packet */
dcoban	0:1a61c61d0845	106	p = NULL;
dcoban	0:1a61c61d0845	107	eaten = 1;
dcoban	0:1a61c61d0845	108	if (prev != NULL) {
dcoban	0:1a61c61d0845	109	/* move the pcb to the front of raw_pcbs so that is
dcoban	0:1a61c61d0845	110	found faster next time */
dcoban	0:1a61c61d0845	111	prev->next = pcb->next;
dcoban	0:1a61c61d0845	112	pcb->next = raw_pcbs;
dcoban	0:1a61c61d0845	113	raw_pcbs = pcb;
dcoban	0:1a61c61d0845	114	}
dcoban	0:1a61c61d0845	115	}
dcoban	0:1a61c61d0845	116	}
dcoban	0:1a61c61d0845	117	/* no receive callback function was set for this raw PCB */
dcoban	0:1a61c61d0845	118	}
dcoban	0:1a61c61d0845	119	/* drop the packet */
dcoban	0:1a61c61d0845	120	}
dcoban	0:1a61c61d0845	121	prev = pcb;
dcoban	0:1a61c61d0845	122	pcb = pcb->next;
dcoban	0:1a61c61d0845	123	}
dcoban	0:1a61c61d0845	124	return eaten;
dcoban	0:1a61c61d0845	125	}
dcoban	0:1a61c61d0845	126
dcoban	0:1a61c61d0845	127	/**
dcoban	0:1a61c61d0845	128	* Bind a RAW PCB.
dcoban	0:1a61c61d0845	129	*
dcoban	0:1a61c61d0845	130	* @param pcb RAW PCB to be bound with a local address ipaddr.
dcoban	0:1a61c61d0845	131	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
dcoban	0:1a61c61d0845	132	* bind to all local interfaces.
dcoban	0:1a61c61d0845	133	*
dcoban	0:1a61c61d0845	134	* @return lwIP error code.
dcoban	0:1a61c61d0845	135	* - ERR_OK. Successful. No error occured.
dcoban	0:1a61c61d0845	136	* - ERR_USE. The specified IP address is already bound to by
dcoban	0:1a61c61d0845	137	* another RAW PCB.
dcoban	0:1a61c61d0845	138	*
dcoban	0:1a61c61d0845	139	* @see raw_disconnect()
dcoban	0:1a61c61d0845	140	*/
dcoban	0:1a61c61d0845	141	err_t
dcoban	0:1a61c61d0845	142	raw_bind(struct raw_pcb pcb, ip_addr_t ipaddr)
dcoban	0:1a61c61d0845	143	{
dcoban	0:1a61c61d0845	144	ip_addr_set(&pcb->local_ip, ipaddr);
dcoban	0:1a61c61d0845	145	return ERR_OK;
dcoban	0:1a61c61d0845	146	}
dcoban	0:1a61c61d0845	147
dcoban	0:1a61c61d0845	148	/**
dcoban	0:1a61c61d0845	149	* Connect an RAW PCB. This function is required by upper layers
dcoban	0:1a61c61d0845	150	* of lwip. Using the raw api you could use raw_sendto() instead
dcoban	0:1a61c61d0845	151	*
dcoban	0:1a61c61d0845	152	* This will associate the RAW PCB with the remote address.
dcoban	0:1a61c61d0845	153	*
dcoban	0:1a61c61d0845	154	* @param pcb RAW PCB to be connected with remote address ipaddr and port.
dcoban	0:1a61c61d0845	155	* @param ipaddr remote IP address to connect with.
dcoban	0:1a61c61d0845	156	*
dcoban	0:1a61c61d0845	157	* @return lwIP error code
dcoban	0:1a61c61d0845	158	*
dcoban	0:1a61c61d0845	159	* @see raw_disconnect() and raw_sendto()
dcoban	0:1a61c61d0845	160	*/
dcoban	0:1a61c61d0845	161	err_t
dcoban	0:1a61c61d0845	162	raw_connect(struct raw_pcb pcb, ip_addr_t ipaddr)
dcoban	0:1a61c61d0845	163	{
dcoban	0:1a61c61d0845	164	ip_addr_set(&pcb->remote_ip, ipaddr);
dcoban	0:1a61c61d0845	165	return ERR_OK;
dcoban	0:1a61c61d0845	166	}
dcoban	0:1a61c61d0845	167
dcoban	0:1a61c61d0845	168
dcoban	0:1a61c61d0845	169	/**
dcoban	0:1a61c61d0845	170	* Set the callback function for received packets that match the
dcoban	0:1a61c61d0845	171	* raw PCB's protocol and binding.
dcoban	0:1a61c61d0845	172	*
dcoban	0:1a61c61d0845	173	* The callback function MUST either
dcoban	0:1a61c61d0845	174	* - eat the packet by calling pbuf_free() and returning non-zero. The
dcoban	0:1a61c61d0845	175	* packet will not be passed to other raw PCBs or other protocol layers.
dcoban	0:1a61c61d0845	176	* - not free the packet, and return zero. The packet will be matched
dcoban	0:1a61c61d0845	177	* against further PCBs and/or forwarded to another protocol layers.
dcoban	0:1a61c61d0845	178	*
dcoban	0:1a61c61d0845	179	* @return non-zero if the packet was free()d, zero if the packet remains
dcoban	0:1a61c61d0845	180	* available for others.
dcoban	0:1a61c61d0845	181	*/
dcoban	0:1a61c61d0845	182	void
dcoban	0:1a61c61d0845	183	raw_recv(struct raw_pcb pcb, raw_recv_fn recv, void recv_arg)
dcoban	0:1a61c61d0845	184	{
dcoban	0:1a61c61d0845	185	/* remember recv() callback and user data */
dcoban	0:1a61c61d0845	186	pcb->recv = recv;
dcoban	0:1a61c61d0845	187	pcb->recv_arg = recv_arg;
dcoban	0:1a61c61d0845	188	}
dcoban	0:1a61c61d0845	189
dcoban	0:1a61c61d0845	190	/**
dcoban	0:1a61c61d0845	191	* Send the raw IP packet to the given address. Note that actually you cannot
dcoban	0:1a61c61d0845	192	* modify the IP headers (this is inconsistent with the receive callback where
dcoban	0:1a61c61d0845	193	* you actually get the IP headers), you can only specify the IP payload here.
dcoban	0:1a61c61d0845	194	* It requires some more changes in lwIP. (there will be a raw_send() function
dcoban	0:1a61c61d0845	195	* then.)
dcoban	0:1a61c61d0845	196	*
dcoban	0:1a61c61d0845	197	* @param pcb the raw pcb which to send
dcoban	0:1a61c61d0845	198	* @param p the IP payload to send
dcoban	0:1a61c61d0845	199	* @param ipaddr the destination address of the IP packet
dcoban	0:1a61c61d0845	200	*
dcoban	0:1a61c61d0845	201	*/
dcoban	0:1a61c61d0845	202	err_t
dcoban	0:1a61c61d0845	203	raw_sendto(struct raw_pcb pcb, struct pbuf p, ip_addr_t *ipaddr)
dcoban	0:1a61c61d0845	204	{
dcoban	0:1a61c61d0845	205	err_t err;
dcoban	0:1a61c61d0845	206	struct netif *netif;
dcoban	0:1a61c61d0845	207	ip_addr_t *src_ip;
dcoban	0:1a61c61d0845	208	struct pbuf q; / q will be sent down the stack */
dcoban	0:1a61c61d0845	209
dcoban	0:1a61c61d0845	210	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_sendto\n"));
dcoban	0:1a61c61d0845	211
dcoban	0:1a61c61d0845	212	/* not enough space to add an IP header to first pbuf in given p chain? */
dcoban	0:1a61c61d0845	213	if (pbuf_header(p, IP_HLEN)) {
dcoban	0:1a61c61d0845	214	/* allocate header in new pbuf */
dcoban	0:1a61c61d0845	215	q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
dcoban	0:1a61c61d0845	216	/* new header pbuf could not be allocated? */
dcoban	0:1a61c61d0845	217	if (q == NULL) {
dcoban	0:1a61c61d0845	218	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
dcoban	0:1a61c61d0845	219	return ERR_MEM;
dcoban	0:1a61c61d0845	220	}
dcoban	0:1a61c61d0845	221	/* chain header q in front of given pbuf p */
dcoban	0:1a61c61d0845	222	pbuf_chain(q, p);
dcoban	0:1a61c61d0845	223	/* { first pbuf q points to header pbuf } */
dcoban	0:1a61c61d0845	224	LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
dcoban	0:1a61c61d0845	225	} else {
dcoban	0:1a61c61d0845	226	/* first pbuf q equals given pbuf */
dcoban	0:1a61c61d0845	227	q = p;
dcoban	0:1a61c61d0845	228	if(pbuf_header(q, -IP_HLEN)) {
dcoban	0:1a61c61d0845	229	LWIP_ASSERT("Can't restore header we just removed!", 0);
dcoban	0:1a61c61d0845	230	return ERR_MEM;
dcoban	0:1a61c61d0845	231	}
dcoban	0:1a61c61d0845	232	}
dcoban	0:1a61c61d0845	233
dcoban	0:1a61c61d0845	234	if ((netif = ip_route(ipaddr)) == NULL) {
dcoban	0:1a61c61d0845	235	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dcoban	0:1a61c61d0845	236	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
dcoban	0:1a61c61d0845	237	/* free any temporary header pbuf allocated by pbuf_header() */
dcoban	0:1a61c61d0845	238	if (q != p) {
dcoban	0:1a61c61d0845	239	pbuf_free(q);
dcoban	0:1a61c61d0845	240	}
dcoban	0:1a61c61d0845	241	return ERR_RTE;
dcoban	0:1a61c61d0845	242	}
dcoban	0:1a61c61d0845	243
dcoban	0:1a61c61d0845	244	#if IP_SOF_BROADCAST
dcoban	0:1a61c61d0845	245	/* broadcast filter? */
dcoban	0:1a61c61d0845	246	if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
dcoban	0:1a61c61d0845	247	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
dcoban	0:1a61c61d0845	248	/* free any temporary header pbuf allocated by pbuf_header() */
dcoban	0:1a61c61d0845	249	if (q != p) {
dcoban	0:1a61c61d0845	250	pbuf_free(q);
dcoban	0:1a61c61d0845	251	}
dcoban	0:1a61c61d0845	252	return ERR_VAL;
dcoban	0:1a61c61d0845	253	}
dcoban	0:1a61c61d0845	254	#endif /* IP_SOF_BROADCAST */
dcoban	0:1a61c61d0845	255
dcoban	0:1a61c61d0845	256	if (ip_addr_isany(&pcb->local_ip)) {
dcoban	0:1a61c61d0845	257	/* use outgoing network interface IP address as source address */
dcoban	0:1a61c61d0845	258	src_ip = &(netif->ip_addr);
dcoban	0:1a61c61d0845	259	} else {
dcoban	0:1a61c61d0845	260	/* use RAW PCB local IP address as source address */
dcoban	0:1a61c61d0845	261	src_ip = &(pcb->local_ip);
dcoban	0:1a61c61d0845	262	}
dcoban	0:1a61c61d0845	263
dcoban	0:1a61c61d0845	264	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	265	netif->addr_hint = &(pcb->addr_hint);
dcoban	0:1a61c61d0845	266	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	267	err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
dcoban	0:1a61c61d0845	268	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	269	netif->addr_hint = NULL;
dcoban	0:1a61c61d0845	270	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	271
dcoban	0:1a61c61d0845	272	/* did we chain a header earlier? */
dcoban	0:1a61c61d0845	273	if (q != p) {
dcoban	0:1a61c61d0845	274	/* free the header */
dcoban	0:1a61c61d0845	275	pbuf_free(q);
dcoban	0:1a61c61d0845	276	}
dcoban	0:1a61c61d0845	277	return err;
dcoban	0:1a61c61d0845	278	}
dcoban	0:1a61c61d0845	279
dcoban	0:1a61c61d0845	280	/**
dcoban	0:1a61c61d0845	281	* Send the raw IP packet to the address given by raw_connect()
dcoban	0:1a61c61d0845	282	*
dcoban	0:1a61c61d0845	283	* @param pcb the raw pcb which to send
dcoban	0:1a61c61d0845	284	* @param p the IP payload to send
dcoban	0:1a61c61d0845	285	*
dcoban	0:1a61c61d0845	286	*/
dcoban	0:1a61c61d0845	287	err_t
dcoban	0:1a61c61d0845	288	raw_send(struct raw_pcb pcb, struct pbuf p)
dcoban	0:1a61c61d0845	289	{
dcoban	0:1a61c61d0845	290	return raw_sendto(pcb, p, &pcb->remote_ip);
dcoban	0:1a61c61d0845	291	}
dcoban	0:1a61c61d0845	292
dcoban	0:1a61c61d0845	293	/**
dcoban	0:1a61c61d0845	294	* Remove an RAW PCB.
dcoban	0:1a61c61d0845	295	*
dcoban	0:1a61c61d0845	296	* @param pcb RAW PCB to be removed. The PCB is removed from the list of
dcoban	0:1a61c61d0845	297	* RAW PCB's and the data structure is freed from memory.
dcoban	0:1a61c61d0845	298	*
dcoban	0:1a61c61d0845	299	* @see raw_new()
dcoban	0:1a61c61d0845	300	*/
dcoban	0:1a61c61d0845	301	void
dcoban	0:1a61c61d0845	302	raw_remove(struct raw_pcb *pcb)
dcoban	0:1a61c61d0845	303	{
dcoban	0:1a61c61d0845	304	struct raw_pcb *pcb2;
dcoban	0:1a61c61d0845	305	/* pcb to be removed is first in list? */
dcoban	0:1a61c61d0845	306	if (raw_pcbs == pcb) {
dcoban	0:1a61c61d0845	307	/* make list start at 2nd pcb */
dcoban	0:1a61c61d0845	308	raw_pcbs = raw_pcbs->next;
dcoban	0:1a61c61d0845	309	/* pcb not 1st in list */
dcoban	0:1a61c61d0845	310	} else {
dcoban	0:1a61c61d0845	311	for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
dcoban	0:1a61c61d0845	312	/* find pcb in raw_pcbs list */
dcoban	0:1a61c61d0845	313	if (pcb2->next != NULL && pcb2->next == pcb) {
dcoban	0:1a61c61d0845	314	/* remove pcb from list */
dcoban	0:1a61c61d0845	315	pcb2->next = pcb->next;
dcoban	0:1a61c61d0845	316	}
dcoban	0:1a61c61d0845	317	}
dcoban	0:1a61c61d0845	318	}
dcoban	0:1a61c61d0845	319	memp_free(MEMP_RAW_PCB, pcb);
dcoban	0:1a61c61d0845	320	}
dcoban	0:1a61c61d0845	321
dcoban	0:1a61c61d0845	322	/**
dcoban	0:1a61c61d0845	323	* Create a RAW PCB.
dcoban	0:1a61c61d0845	324	*
dcoban	0:1a61c61d0845	325	* @return The RAW PCB which was created. NULL if the PCB data structure
dcoban	0:1a61c61d0845	326	* could not be allocated.
dcoban	0:1a61c61d0845	327	*
dcoban	0:1a61c61d0845	328	* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
dcoban	0:1a61c61d0845	329	*
dcoban	0:1a61c61d0845	330	* @see raw_remove()
dcoban	0:1a61c61d0845	331	*/
dcoban	0:1a61c61d0845	332	struct raw_pcb *
dcoban	0:1a61c61d0845	333	raw_new(u8_t proto)
dcoban	0:1a61c61d0845	334	{
dcoban	0:1a61c61d0845	335	struct raw_pcb *pcb;
dcoban	0:1a61c61d0845	336
dcoban	0:1a61c61d0845	337	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_new\n"));
dcoban	0:1a61c61d0845	338
dcoban	0:1a61c61d0845	339	pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
dcoban	0:1a61c61d0845	340	/* could allocate RAW PCB? */
dcoban	0:1a61c61d0845	341	if (pcb != NULL) {
dcoban	0:1a61c61d0845	342	/* initialize PCB to all zeroes */
dcoban	0:1a61c61d0845	343	memset(pcb, 0, sizeof(struct raw_pcb));
dcoban	0:1a61c61d0845	344	pcb->protocol = proto;
dcoban	0:1a61c61d0845	345	pcb->ttl = RAW_TTL;
dcoban	0:1a61c61d0845	346	pcb->next = raw_pcbs;
dcoban	0:1a61c61d0845	347	raw_pcbs = pcb;
dcoban	0:1a61c61d0845	348	}
dcoban	0:1a61c61d0845	349	return pcb;
dcoban	0:1a61c61d0845	350	}
dcoban	0:1a61c61d0845	351
dcoban	0:1a61c61d0845	352	#endif /* LWIP_RAW */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	03 Apr 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	1

NetStack/lwip/core/raw.c@0:1a61c61d0845, 2012-04-03 (annotated)

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