WebSockets2 - Embedded WebSockets Experiment

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John Lowe / Mbed 2 deprecated WebSockets2

Embedded WebSockets Experiment

Core/lwIP/core/raw.c@0:6dee052a3fa4, 2011-07-26 (annotated)

Committer:: nandgate
Date:: Tue Jul 26 05:30:53 2011 +0000
Revision:: 0:6dee052a3fa4

Who changed what in which revision?

User	Revision	Line number	New contents of line
nandgate	0:6dee052a3fa4	1	/**
nandgate	0:6dee052a3fa4	2	* @file
nandgate	0:6dee052a3fa4	3	* Implementation of raw protocol PCBs for low-level handling of
nandgate	0:6dee052a3fa4	4	* different types of protocols besides (or overriding) those
nandgate	0:6dee052a3fa4	5	* already available in lwIP.
nandgate	0:6dee052a3fa4	6	*
nandgate	0:6dee052a3fa4	7	*/
nandgate	0:6dee052a3fa4	8
nandgate	0:6dee052a3fa4	9	/*
nandgate	0:6dee052a3fa4	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
nandgate	0:6dee052a3fa4	11	* All rights reserved.
nandgate	0:6dee052a3fa4	12	*
nandgate	0:6dee052a3fa4	13	* Redistribution and use in source and binary forms, with or without modification,
nandgate	0:6dee052a3fa4	14	* are permitted provided that the following conditions are met:
nandgate	0:6dee052a3fa4	15	*
nandgate	0:6dee052a3fa4	16	* 1. Redistributions of source code must retain the above copyright notice,
nandgate	0:6dee052a3fa4	17	* this list of conditions and the following disclaimer.
nandgate	0:6dee052a3fa4	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
nandgate	0:6dee052a3fa4	19	* this list of conditions and the following disclaimer in the documentation
nandgate	0:6dee052a3fa4	20	* and/or other materials provided with the distribution.
nandgate	0:6dee052a3fa4	21	* 3. The name of the author may not be used to endorse or promote products
nandgate	0:6dee052a3fa4	22	* derived from this software without specific prior written permission.
nandgate	0:6dee052a3fa4	23	*
nandgate	0:6dee052a3fa4	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
nandgate	0:6dee052a3fa4	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
nandgate	0:6dee052a3fa4	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
nandgate	0:6dee052a3fa4	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
nandgate	0:6dee052a3fa4	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
nandgate	0:6dee052a3fa4	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
nandgate	0:6dee052a3fa4	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
nandgate	0:6dee052a3fa4	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
nandgate	0:6dee052a3fa4	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
nandgate	0:6dee052a3fa4	33	* OF SUCH DAMAGE.
nandgate	0:6dee052a3fa4	34	*
nandgate	0:6dee052a3fa4	35	* This file is part of the lwIP TCP/IP stack.
nandgate	0:6dee052a3fa4	36	*
nandgate	0:6dee052a3fa4	37	* Author: Adam Dunkels <adam@sics.se>
nandgate	0:6dee052a3fa4	38	*
nandgate	0:6dee052a3fa4	39	*/
nandgate	0:6dee052a3fa4	40
nandgate	0:6dee052a3fa4	41	#include "lwip/opt.h"
nandgate	0:6dee052a3fa4	42
nandgate	0:6dee052a3fa4	43	#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
nandgate	0:6dee052a3fa4	44
nandgate	0:6dee052a3fa4	45	#include "lwip/def.h"
nandgate	0:6dee052a3fa4	46	#include "lwip/memp.h"
nandgate	0:6dee052a3fa4	47	#include "lwip/inet.h"
nandgate	0:6dee052a3fa4	48	#include "lwip/ip_addr.h"
nandgate	0:6dee052a3fa4	49	#include "lwip/netif.h"
nandgate	0:6dee052a3fa4	50	#include "lwip/raw.h"
nandgate	0:6dee052a3fa4	51	#include "lwip/stats.h"
nandgate	0:6dee052a3fa4	52	#include "lwip/snmp.h"
nandgate	0:6dee052a3fa4	53	#include "arch/perf.h"
nandgate	0:6dee052a3fa4	54
nandgate	0:6dee052a3fa4	55	#include <string.h>
nandgate	0:6dee052a3fa4	56
nandgate	0:6dee052a3fa4	57	/** The list of RAW PCBs */
nandgate	0:6dee052a3fa4	58	static struct raw_pcb *raw_pcbs;
nandgate	0:6dee052a3fa4	59
nandgate	0:6dee052a3fa4	60	/**
nandgate	0:6dee052a3fa4	61	* Determine if in incoming IP packet is covered by a RAW PCB
nandgate	0:6dee052a3fa4	62	* and if so, pass it to a user-provided receive callback function.
nandgate	0:6dee052a3fa4	63	*
nandgate	0:6dee052a3fa4	64	* Given an incoming IP datagram (as a chain of pbufs) this function
nandgate	0:6dee052a3fa4	65	* finds a corresponding RAW PCB and calls the corresponding receive
nandgate	0:6dee052a3fa4	66	* callback function.
nandgate	0:6dee052a3fa4	67	*
nandgate	0:6dee052a3fa4	68	* @param p pbuf to be demultiplexed to a RAW PCB.
nandgate	0:6dee052a3fa4	69	* @param inp network interface on which the datagram was received.
nandgate	0:6dee052a3fa4	70	* @return - 1 if the packet has been eaten by a RAW PCB receive
nandgate	0:6dee052a3fa4	71	* callback function. The caller MAY NOT not reference the
nandgate	0:6dee052a3fa4	72	* packet any longer, and MAY NOT call pbuf_free().
nandgate	0:6dee052a3fa4	73	* @return - 0 if packet is not eaten (pbuf is still referenced by the
nandgate	0:6dee052a3fa4	74	* caller).
nandgate	0:6dee052a3fa4	75	*
nandgate	0:6dee052a3fa4	76	*/
nandgate	0:6dee052a3fa4	77	u8_t
nandgate	0:6dee052a3fa4	78	raw_input(struct pbuf p, struct netif inp)
nandgate	0:6dee052a3fa4	79	{
nandgate	0:6dee052a3fa4	80	struct raw_pcb pcb, prev;
nandgate	0:6dee052a3fa4	81	struct ip_hdr *iphdr;
nandgate	0:6dee052a3fa4	82	s16_t proto;
nandgate	0:6dee052a3fa4	83	u8_t eaten = 0;
nandgate	0:6dee052a3fa4	84
nandgate	0:6dee052a3fa4	85	LWIP_UNUSED_ARG(inp);
nandgate	0:6dee052a3fa4	86
nandgate	0:6dee052a3fa4	87	iphdr = p->payload;
nandgate	0:6dee052a3fa4	88	proto = IPH_PROTO(iphdr);
nandgate	0:6dee052a3fa4	89
nandgate	0:6dee052a3fa4	90	prev = NULL;
nandgate	0:6dee052a3fa4	91	pcb = raw_pcbs;
nandgate	0:6dee052a3fa4	92	/* loop through all raw pcbs until the packet is eaten by one */
nandgate	0:6dee052a3fa4	93	/* this allows multiple pcbs to match against the packet by design */
nandgate	0:6dee052a3fa4	94	while ((eaten == 0) && (pcb != NULL)) {
nandgate	0:6dee052a3fa4	95	if (pcb->protocol == proto) {
nandgate	0:6dee052a3fa4	96	#if IP_SOF_BROADCAST_RECV
nandgate	0:6dee052a3fa4	97	/* broadcast filter? */
nandgate	0:6dee052a3fa4	98	if ((pcb->so_options & SOF_BROADCAST) \|\| !ip_addr_isbroadcast(&(iphdr->dest), inp))
nandgate	0:6dee052a3fa4	99	#endif /* IP_SOF_BROADCAST_RECV */
nandgate	0:6dee052a3fa4	100	{
nandgate	0:6dee052a3fa4	101	/* receive callback function available? */
nandgate	0:6dee052a3fa4	102	if (pcb->recv != NULL) {
nandgate	0:6dee052a3fa4	103	/* the receive callback function did not eat the packet? */
nandgate	0:6dee052a3fa4	104	if (pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src)) != 0) {
nandgate	0:6dee052a3fa4	105	/* receive function ate the packet */
nandgate	0:6dee052a3fa4	106	p = NULL;
nandgate	0:6dee052a3fa4	107	eaten = 1;
nandgate	0:6dee052a3fa4	108	if (prev != NULL) {
nandgate	0:6dee052a3fa4	109	/* move the pcb to the front of raw_pcbs so that is
nandgate	0:6dee052a3fa4	110	found faster next time */
nandgate	0:6dee052a3fa4	111	prev->next = pcb->next;
nandgate	0:6dee052a3fa4	112	pcb->next = raw_pcbs;
nandgate	0:6dee052a3fa4	113	raw_pcbs = pcb;
nandgate	0:6dee052a3fa4	114	}
nandgate	0:6dee052a3fa4	115	}
nandgate	0:6dee052a3fa4	116	}
nandgate	0:6dee052a3fa4	117	/* no receive callback function was set for this raw PCB */
nandgate	0:6dee052a3fa4	118	}
nandgate	0:6dee052a3fa4	119	/* drop the packet */
nandgate	0:6dee052a3fa4	120	}
nandgate	0:6dee052a3fa4	121	prev = pcb;
nandgate	0:6dee052a3fa4	122	pcb = pcb->next;
nandgate	0:6dee052a3fa4	123	}
nandgate	0:6dee052a3fa4	124	return eaten;
nandgate	0:6dee052a3fa4	125	}
nandgate	0:6dee052a3fa4	126
nandgate	0:6dee052a3fa4	127	/**
nandgate	0:6dee052a3fa4	128	* Bind a RAW PCB.
nandgate	0:6dee052a3fa4	129	*
nandgate	0:6dee052a3fa4	130	* @param pcb RAW PCB to be bound with a local address ipaddr.
nandgate	0:6dee052a3fa4	131	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
nandgate	0:6dee052a3fa4	132	* bind to all local interfaces.
nandgate	0:6dee052a3fa4	133	*
nandgate	0:6dee052a3fa4	134	* @return lwIP error code.
nandgate	0:6dee052a3fa4	135	* - ERR_OK. Successful. No error occured.
nandgate	0:6dee052a3fa4	136	* - ERR_USE. The specified IP address is already bound to by
nandgate	0:6dee052a3fa4	137	* another RAW PCB.
nandgate	0:6dee052a3fa4	138	*
nandgate	0:6dee052a3fa4	139	* @see raw_disconnect()
nandgate	0:6dee052a3fa4	140	*/
nandgate	0:6dee052a3fa4	141	err_t
nandgate	0:6dee052a3fa4	142	raw_bind(struct raw_pcb pcb, struct ip_addr ipaddr)
nandgate	0:6dee052a3fa4	143	{
nandgate	0:6dee052a3fa4	144	ip_addr_set(&pcb->local_ip, ipaddr);
nandgate	0:6dee052a3fa4	145	return ERR_OK;
nandgate	0:6dee052a3fa4	146	}
nandgate	0:6dee052a3fa4	147
nandgate	0:6dee052a3fa4	148	/**
nandgate	0:6dee052a3fa4	149	* Connect an RAW PCB. This function is required by upper layers
nandgate	0:6dee052a3fa4	150	* of lwip. Using the raw api you could use raw_sendto() instead
nandgate	0:6dee052a3fa4	151	*
nandgate	0:6dee052a3fa4	152	* This will associate the RAW PCB with the remote address.
nandgate	0:6dee052a3fa4	153	*
nandgate	0:6dee052a3fa4	154	* @param pcb RAW PCB to be connected with remote address ipaddr and port.
nandgate	0:6dee052a3fa4	155	* @param ipaddr remote IP address to connect with.
nandgate	0:6dee052a3fa4	156	*
nandgate	0:6dee052a3fa4	157	* @return lwIP error code
nandgate	0:6dee052a3fa4	158	*
nandgate	0:6dee052a3fa4	159	* @see raw_disconnect() and raw_sendto()
nandgate	0:6dee052a3fa4	160	*/
nandgate	0:6dee052a3fa4	161	err_t
nandgate	0:6dee052a3fa4	162	raw_connect(struct raw_pcb pcb, struct ip_addr ipaddr)
nandgate	0:6dee052a3fa4	163	{
nandgate	0:6dee052a3fa4	164	ip_addr_set(&pcb->remote_ip, ipaddr);
nandgate	0:6dee052a3fa4	165	return ERR_OK;
nandgate	0:6dee052a3fa4	166	}
nandgate	0:6dee052a3fa4	167
nandgate	0:6dee052a3fa4	168
nandgate	0:6dee052a3fa4	169	/**
nandgate	0:6dee052a3fa4	170	* Set the callback function for received packets that match the
nandgate	0:6dee052a3fa4	171	* raw PCB's protocol and binding.
nandgate	0:6dee052a3fa4	172	*
nandgate	0:6dee052a3fa4	173	* The callback function MUST either
nandgate	0:6dee052a3fa4	174	* - eat the packet by calling pbuf_free() and returning non-zero. The
nandgate	0:6dee052a3fa4	175	* packet will not be passed to other raw PCBs or other protocol layers.
nandgate	0:6dee052a3fa4	176	* - not free the packet, and return zero. The packet will be matched
nandgate	0:6dee052a3fa4	177	* against further PCBs and/or forwarded to another protocol layers.
nandgate	0:6dee052a3fa4	178	*
nandgate	0:6dee052a3fa4	179	* @return non-zero if the packet was free()d, zero if the packet remains
nandgate	0:6dee052a3fa4	180	* available for others.
nandgate	0:6dee052a3fa4	181	*/
nandgate	0:6dee052a3fa4	182	void
nandgate	0:6dee052a3fa4	183	raw_recv(struct raw_pcb *pcb,
nandgate	0:6dee052a3fa4	184	u8_t (* recv)(void arg, struct raw_pcb upcb, struct pbuf *p,
nandgate	0:6dee052a3fa4	185	struct ip_addr *addr),
nandgate	0:6dee052a3fa4	186	void *recv_arg)
nandgate	0:6dee052a3fa4	187	{
nandgate	0:6dee052a3fa4	188	/* remember recv() callback and user data */
nandgate	0:6dee052a3fa4	189	pcb->recv = recv;
nandgate	0:6dee052a3fa4	190	pcb->recv_arg = recv_arg;
nandgate	0:6dee052a3fa4	191	}
nandgate	0:6dee052a3fa4	192
nandgate	0:6dee052a3fa4	193	/**
nandgate	0:6dee052a3fa4	194	* Send the raw IP packet to the given address. Note that actually you cannot
nandgate	0:6dee052a3fa4	195	* modify the IP headers (this is inconsistent with the receive callback where
nandgate	0:6dee052a3fa4	196	* you actually get the IP headers), you can only specify the IP payload here.
nandgate	0:6dee052a3fa4	197	* It requires some more changes in lwIP. (there will be a raw_send() function
nandgate	0:6dee052a3fa4	198	* then.)
nandgate	0:6dee052a3fa4	199	*
nandgate	0:6dee052a3fa4	200	* @param pcb the raw pcb which to send
nandgate	0:6dee052a3fa4	201	* @param p the IP payload to send
nandgate	0:6dee052a3fa4	202	* @param ipaddr the destination address of the IP packet
nandgate	0:6dee052a3fa4	203	*
nandgate	0:6dee052a3fa4	204	*/
nandgate	0:6dee052a3fa4	205	err_t
nandgate	0:6dee052a3fa4	206	raw_sendto(struct raw_pcb pcb, struct pbuf p, struct ip_addr *ipaddr)
nandgate	0:6dee052a3fa4	207	{
nandgate	0:6dee052a3fa4	208	err_t err;
nandgate	0:6dee052a3fa4	209	struct netif *netif;
nandgate	0:6dee052a3fa4	210	struct ip_addr *src_ip;
nandgate	0:6dee052a3fa4	211	struct pbuf q; / q will be sent down the stack */
nandgate	0:6dee052a3fa4	212
nandgate	0:6dee052a3fa4	213	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| 3, ("raw_sendto\n"));
nandgate	0:6dee052a3fa4	214
nandgate	0:6dee052a3fa4	215	/* not enough space to add an IP header to first pbuf in given p chain? */
nandgate	0:6dee052a3fa4	216	if (pbuf_header(p, IP_HLEN)) {
nandgate	0:6dee052a3fa4	217	/* allocate header in new pbuf */
nandgate	0:6dee052a3fa4	218	q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
nandgate	0:6dee052a3fa4	219	/* new header pbuf could not be allocated? */
nandgate	0:6dee052a3fa4	220	if (q == NULL) {
nandgate	0:6dee052a3fa4	221	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| 2, ("raw_sendto: could not allocate header\n"));
nandgate	0:6dee052a3fa4	222	return ERR_MEM;
nandgate	0:6dee052a3fa4	223	}
nandgate	0:6dee052a3fa4	224	/* chain header q in front of given pbuf p */
nandgate	0:6dee052a3fa4	225	pbuf_chain(q, p);
nandgate	0:6dee052a3fa4	226	/* { first pbuf q points to header pbuf } */
nandgate	0:6dee052a3fa4	227	LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
nandgate	0:6dee052a3fa4	228	} else {
nandgate	0:6dee052a3fa4	229	/* first pbuf q equals given pbuf */
nandgate	0:6dee052a3fa4	230	q = p;
nandgate	0:6dee052a3fa4	231	if(pbuf_header(q, -IP_HLEN)) {
nandgate	0:6dee052a3fa4	232	LWIP_ASSERT("Can't restore header we just removed!", 0);
nandgate	0:6dee052a3fa4	233	return ERR_MEM;
nandgate	0:6dee052a3fa4	234	}
nandgate	0:6dee052a3fa4	235	}
nandgate	0:6dee052a3fa4	236
nandgate	0:6dee052a3fa4	237	if ((netif = ip_route(ipaddr)) == NULL) {
nandgate	0:6dee052a3fa4	238	LWIP_DEBUGF(RAW_DEBUG \| 1, ("raw_sendto: No route to 0x%"X32_F"\n", ipaddr->addr));
nandgate	0:6dee052a3fa4	239	/* free any temporary header pbuf allocated by pbuf_header() */
nandgate	0:6dee052a3fa4	240	if (q != p) {
nandgate	0:6dee052a3fa4	241	pbuf_free(q);
nandgate	0:6dee052a3fa4	242	}
nandgate	0:6dee052a3fa4	243	return ERR_RTE;
nandgate	0:6dee052a3fa4	244	}
nandgate	0:6dee052a3fa4	245
nandgate	0:6dee052a3fa4	246	#if IP_SOF_BROADCAST
nandgate	0:6dee052a3fa4	247	/* broadcast filter? */
nandgate	0:6dee052a3fa4	248	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif) ) {
nandgate	0:6dee052a3fa4	249	LWIP_DEBUGF(RAW_DEBUG \| 1, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
nandgate	0:6dee052a3fa4	250	/* free any temporary header pbuf allocated by pbuf_header() */
nandgate	0:6dee052a3fa4	251	if (q != p) {
nandgate	0:6dee052a3fa4	252	pbuf_free(q);
nandgate	0:6dee052a3fa4	253	}
nandgate	0:6dee052a3fa4	254	return ERR_VAL;
nandgate	0:6dee052a3fa4	255	}
nandgate	0:6dee052a3fa4	256	#endif /* IP_SOF_BROADCAST */
nandgate	0:6dee052a3fa4	257
nandgate	0:6dee052a3fa4	258	if (ip_addr_isany(&pcb->local_ip)) {
nandgate	0:6dee052a3fa4	259	/* use outgoing network interface IP address as source address */
nandgate	0:6dee052a3fa4	260	src_ip = &(netif->ip_addr);
nandgate	0:6dee052a3fa4	261	} else {
nandgate	0:6dee052a3fa4	262	/* use RAW PCB local IP address as source address */
nandgate	0:6dee052a3fa4	263	src_ip = &(pcb->local_ip);
nandgate	0:6dee052a3fa4	264	}
nandgate	0:6dee052a3fa4	265
nandgate	0:6dee052a3fa4	266	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	267	netif->addr_hint = &(pcb->addr_hint);
nandgate	0:6dee052a3fa4	268	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	269	err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
nandgate	0:6dee052a3fa4	270	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	271	netif->addr_hint = NULL;
nandgate	0:6dee052a3fa4	272	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	273
nandgate	0:6dee052a3fa4	274	/* did we chain a header earlier? */
nandgate	0:6dee052a3fa4	275	if (q != p) {
nandgate	0:6dee052a3fa4	276	/* free the header */
nandgate	0:6dee052a3fa4	277	pbuf_free(q);
nandgate	0:6dee052a3fa4	278	}
nandgate	0:6dee052a3fa4	279	return err;
nandgate	0:6dee052a3fa4	280	}
nandgate	0:6dee052a3fa4	281
nandgate	0:6dee052a3fa4	282	/**
nandgate	0:6dee052a3fa4	283	* Send the raw IP packet to the address given by raw_connect()
nandgate	0:6dee052a3fa4	284	*
nandgate	0:6dee052a3fa4	285	* @param pcb the raw pcb which to send
nandgate	0:6dee052a3fa4	286	* @param p the IP payload to send
nandgate	0:6dee052a3fa4	287	*
nandgate	0:6dee052a3fa4	288	*/
nandgate	0:6dee052a3fa4	289	err_t
nandgate	0:6dee052a3fa4	290	raw_send(struct raw_pcb pcb, struct pbuf p)
nandgate	0:6dee052a3fa4	291	{
nandgate	0:6dee052a3fa4	292	return raw_sendto(pcb, p, &pcb->remote_ip);
nandgate	0:6dee052a3fa4	293	}
nandgate	0:6dee052a3fa4	294
nandgate	0:6dee052a3fa4	295	/**
nandgate	0:6dee052a3fa4	296	* Remove an RAW PCB.
nandgate	0:6dee052a3fa4	297	*
nandgate	0:6dee052a3fa4	298	* @param pcb RAW PCB to be removed. The PCB is removed from the list of
nandgate	0:6dee052a3fa4	299	* RAW PCB's and the data structure is freed from memory.
nandgate	0:6dee052a3fa4	300	*
nandgate	0:6dee052a3fa4	301	* @see raw_new()
nandgate	0:6dee052a3fa4	302	*/
nandgate	0:6dee052a3fa4	303	void
nandgate	0:6dee052a3fa4	304	raw_remove(struct raw_pcb *pcb)
nandgate	0:6dee052a3fa4	305	{
nandgate	0:6dee052a3fa4	306	struct raw_pcb *pcb2;
nandgate	0:6dee052a3fa4	307	/* pcb to be removed is first in list? */
nandgate	0:6dee052a3fa4	308	if (raw_pcbs == pcb) {
nandgate	0:6dee052a3fa4	309	/* make list start at 2nd pcb */
nandgate	0:6dee052a3fa4	310	raw_pcbs = raw_pcbs->next;
nandgate	0:6dee052a3fa4	311	/* pcb not 1st in list */
nandgate	0:6dee052a3fa4	312	} else {
nandgate	0:6dee052a3fa4	313	for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
nandgate	0:6dee052a3fa4	314	/* find pcb in raw_pcbs list */
nandgate	0:6dee052a3fa4	315	if (pcb2->next != NULL && pcb2->next == pcb) {
nandgate	0:6dee052a3fa4	316	/* remove pcb from list */
nandgate	0:6dee052a3fa4	317	pcb2->next = pcb->next;
nandgate	0:6dee052a3fa4	318	}
nandgate	0:6dee052a3fa4	319	}
nandgate	0:6dee052a3fa4	320	}
nandgate	0:6dee052a3fa4	321	memp_free(MEMP_RAW_PCB, pcb);
nandgate	0:6dee052a3fa4	322	}
nandgate	0:6dee052a3fa4	323
nandgate	0:6dee052a3fa4	324	/**
nandgate	0:6dee052a3fa4	325	* Create a RAW PCB.
nandgate	0:6dee052a3fa4	326	*
nandgate	0:6dee052a3fa4	327	* @return The RAW PCB which was created. NULL if the PCB data structure
nandgate	0:6dee052a3fa4	328	* could not be allocated.
nandgate	0:6dee052a3fa4	329	*
nandgate	0:6dee052a3fa4	330	* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
nandgate	0:6dee052a3fa4	331	*
nandgate	0:6dee052a3fa4	332	* @see raw_remove()
nandgate	0:6dee052a3fa4	333	*/
nandgate	0:6dee052a3fa4	334	struct raw_pcb *
nandgate	0:6dee052a3fa4	335	raw_new(u8_t proto) {
nandgate	0:6dee052a3fa4	336	struct raw_pcb *pcb;
nandgate	0:6dee052a3fa4	337
nandgate	0:6dee052a3fa4	338	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| 3, ("raw_new\n"));
nandgate	0:6dee052a3fa4	339
nandgate	0:6dee052a3fa4	340	pcb = memp_malloc(MEMP_RAW_PCB);
nandgate	0:6dee052a3fa4	341	/* could allocate RAW PCB? */
nandgate	0:6dee052a3fa4	342	if (pcb != NULL) {
nandgate	0:6dee052a3fa4	343	/* initialize PCB to all zeroes */
nandgate	0:6dee052a3fa4	344	memset(pcb, 0, sizeof(struct raw_pcb));
nandgate	0:6dee052a3fa4	345	pcb->protocol = proto;
nandgate	0:6dee052a3fa4	346	pcb->ttl = RAW_TTL;
nandgate	0:6dee052a3fa4	347	pcb->next = raw_pcbs;
nandgate	0:6dee052a3fa4	348	raw_pcbs = pcb;
nandgate	0:6dee052a3fa4	349	}
nandgate	0:6dee052a3fa4	350	return pcb;
nandgate	0:6dee052a3fa4	351	}
nandgate	0:6dee052a3fa4	352
nandgate	0:6dee052a3fa4	353	#endif /* LWIP_RAW */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Jul 2011
Imports:	159
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	9

Core/lwIP/core/raw.c@0:6dee052a3fa4, 2011-07-26 (annotated)

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