WeatherStation - Web server based weather station using Sparkfun W…

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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/core/raw.c@0:616601bde9fb, 2012-02-23 (annotated)

Committer:: AdamGreen
Date:: Thu Feb 23 21:38:39 2012 +0000
Revision:: 0:616601bde9fb

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* Implementation of raw protocol PCBs for low-level handling of
AdamGreen	0:616601bde9fb	4	* different types of protocols besides (or overriding) those
AdamGreen	0:616601bde9fb	5	* already available in lwIP.
AdamGreen	0:616601bde9fb	6	*
AdamGreen	0:616601bde9fb	7	*/
AdamGreen	0:616601bde9fb	8
AdamGreen	0:616601bde9fb	9	/*
AdamGreen	0:616601bde9fb	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen	0:616601bde9fb	11	* All rights reserved.
AdamGreen	0:616601bde9fb	12	*
AdamGreen	0:616601bde9fb	13	* Redistribution and use in source and binary forms, with or without modification,
AdamGreen	0:616601bde9fb	14	* are permitted provided that the following conditions are met:
AdamGreen	0:616601bde9fb	15	*
AdamGreen	0:616601bde9fb	16	* 1. Redistributions of source code must retain the above copyright notice,
AdamGreen	0:616601bde9fb	17	* this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen	0:616601bde9fb	19	* this list of conditions and the following disclaimer in the documentation
AdamGreen	0:616601bde9fb	20	* and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	21	* 3. The name of the author may not be used to endorse or promote products
AdamGreen	0:616601bde9fb	22	* derived from this software without specific prior written permission.
AdamGreen	0:616601bde9fb	23	*
AdamGreen	0:616601bde9fb	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen	0:616601bde9fb	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen	0:616601bde9fb	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen	0:616601bde9fb	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen	0:616601bde9fb	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen	0:616601bde9fb	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen	0:616601bde9fb	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen	0:616601bde9fb	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen	0:616601bde9fb	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen	0:616601bde9fb	33	* OF SUCH DAMAGE.
AdamGreen	0:616601bde9fb	34	*
AdamGreen	0:616601bde9fb	35	* This file is part of the lwIP TCP/IP stack.
AdamGreen	0:616601bde9fb	36	*
AdamGreen	0:616601bde9fb	37	* Author: Adam Dunkels <adam@sics.se>
AdamGreen	0:616601bde9fb	38	*
AdamGreen	0:616601bde9fb	39	*/
AdamGreen	0:616601bde9fb	40
AdamGreen	0:616601bde9fb	41	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	42
AdamGreen	0:616601bde9fb	43	#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
AdamGreen	0:616601bde9fb	44
AdamGreen	0:616601bde9fb	45	#include "lwip/def.h"
AdamGreen	0:616601bde9fb	46	#include "lwip/memp.h"
AdamGreen	0:616601bde9fb	47	#include "lwip/ip_addr.h"
AdamGreen	0:616601bde9fb	48	#include "lwip/netif.h"
AdamGreen	0:616601bde9fb	49	#include "lwip/raw.h"
AdamGreen	0:616601bde9fb	50	#include "lwip/stats.h"
AdamGreen	0:616601bde9fb	51	#include "arch/perf.h"
AdamGreen	0:616601bde9fb	52
AdamGreen	0:616601bde9fb	53	#include <string.h>
AdamGreen	0:616601bde9fb	54
AdamGreen	0:616601bde9fb	55	/** The list of RAW PCBs */
AdamGreen	0:616601bde9fb	56	static struct raw_pcb *raw_pcbs;
AdamGreen	0:616601bde9fb	57
AdamGreen	0:616601bde9fb	58	/**
AdamGreen	0:616601bde9fb	59	* Determine if in incoming IP packet is covered by a RAW PCB
AdamGreen	0:616601bde9fb	60	* and if so, pass it to a user-provided receive callback function.
AdamGreen	0:616601bde9fb	61	*
AdamGreen	0:616601bde9fb	62	* Given an incoming IP datagram (as a chain of pbufs) this function
AdamGreen	0:616601bde9fb	63	* finds a corresponding RAW PCB and calls the corresponding receive
AdamGreen	0:616601bde9fb	64	* callback function.
AdamGreen	0:616601bde9fb	65	*
AdamGreen	0:616601bde9fb	66	* @param p pbuf to be demultiplexed to a RAW PCB.
AdamGreen	0:616601bde9fb	67	* @param inp network interface on which the datagram was received.
AdamGreen	0:616601bde9fb	68	* @return - 1 if the packet has been eaten by a RAW PCB receive
AdamGreen	0:616601bde9fb	69	* callback function. The caller MAY NOT not reference the
AdamGreen	0:616601bde9fb	70	* packet any longer, and MAY NOT call pbuf_free().
AdamGreen	0:616601bde9fb	71	* @return - 0 if packet is not eaten (pbuf is still referenced by the
AdamGreen	0:616601bde9fb	72	* caller).
AdamGreen	0:616601bde9fb	73	*
AdamGreen	0:616601bde9fb	74	*/
AdamGreen	0:616601bde9fb	75	u8_t
AdamGreen	0:616601bde9fb	76	raw_input(struct pbuf p, struct netif inp)
AdamGreen	0:616601bde9fb	77	{
AdamGreen	0:616601bde9fb	78	struct raw_pcb pcb, prev;
AdamGreen	0:616601bde9fb	79	struct ip_hdr *iphdr;
AdamGreen	0:616601bde9fb	80	s16_t proto;
AdamGreen	0:616601bde9fb	81	u8_t eaten = 0;
AdamGreen	0:616601bde9fb	82
AdamGreen	0:616601bde9fb	83	LWIP_UNUSED_ARG(inp);
AdamGreen	0:616601bde9fb	84
AdamGreen	0:616601bde9fb	85	iphdr = (struct ip_hdr *)p->payload;
AdamGreen	0:616601bde9fb	86	proto = IPH_PROTO(iphdr);
AdamGreen	0:616601bde9fb	87
AdamGreen	0:616601bde9fb	88	prev = NULL;
AdamGreen	0:616601bde9fb	89	pcb = raw_pcbs;
AdamGreen	0:616601bde9fb	90	/* loop through all raw pcbs until the packet is eaten by one */
AdamGreen	0:616601bde9fb	91	/* this allows multiple pcbs to match against the packet by design */
AdamGreen	0:616601bde9fb	92	while ((eaten == 0) && (pcb != NULL)) {
AdamGreen	0:616601bde9fb	93	if ((pcb->protocol == proto) &&
AdamGreen	0:616601bde9fb	94	(ip_addr_isany(&pcb->local_ip) \|\|
AdamGreen	0:616601bde9fb	95	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest))) {
AdamGreen	0:616601bde9fb	96	#if IP_SOF_BROADCAST_RECV
AdamGreen	0:616601bde9fb	97	/* broadcast filter? */
AdamGreen	0:616601bde9fb	98	if ((pcb->so_options & SOF_BROADCAST) \|\| !ip_addr_isbroadcast(&current_iphdr_dest, inp))
AdamGreen	0:616601bde9fb	99	#endif /* IP_SOF_BROADCAST_RECV */
AdamGreen	0:616601bde9fb	100	{
AdamGreen	0:616601bde9fb	101	/* receive callback function available? */
AdamGreen	0:616601bde9fb	102	if (pcb->recv != NULL) {
AdamGreen	0:616601bde9fb	103	/* the receive callback function did not eat the packet? */
AdamGreen	0:616601bde9fb	104	if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
AdamGreen	0:616601bde9fb	105	/* receive function ate the packet */
AdamGreen	0:616601bde9fb	106	p = NULL;
AdamGreen	0:616601bde9fb	107	eaten = 1;
AdamGreen	0:616601bde9fb	108	if (prev != NULL) {
AdamGreen	0:616601bde9fb	109	/* move the pcb to the front of raw_pcbs so that is
AdamGreen	0:616601bde9fb	110	found faster next time */
AdamGreen	0:616601bde9fb	111	prev->next = pcb->next;
AdamGreen	0:616601bde9fb	112	pcb->next = raw_pcbs;
AdamGreen	0:616601bde9fb	113	raw_pcbs = pcb;
AdamGreen	0:616601bde9fb	114	}
AdamGreen	0:616601bde9fb	115	}
AdamGreen	0:616601bde9fb	116	}
AdamGreen	0:616601bde9fb	117	/* no receive callback function was set for this raw PCB */
AdamGreen	0:616601bde9fb	118	}
AdamGreen	0:616601bde9fb	119	/* drop the packet */
AdamGreen	0:616601bde9fb	120	}
AdamGreen	0:616601bde9fb	121	prev = pcb;
AdamGreen	0:616601bde9fb	122	pcb = pcb->next;
AdamGreen	0:616601bde9fb	123	}
AdamGreen	0:616601bde9fb	124	return eaten;
AdamGreen	0:616601bde9fb	125	}
AdamGreen	0:616601bde9fb	126
AdamGreen	0:616601bde9fb	127	/**
AdamGreen	0:616601bde9fb	128	* Bind a RAW PCB.
AdamGreen	0:616601bde9fb	129	*
AdamGreen	0:616601bde9fb	130	* @param pcb RAW PCB to be bound with a local address ipaddr.
AdamGreen	0:616601bde9fb	131	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
AdamGreen	0:616601bde9fb	132	* bind to all local interfaces.
AdamGreen	0:616601bde9fb	133	*
AdamGreen	0:616601bde9fb	134	* @return lwIP error code.
AdamGreen	0:616601bde9fb	135	* - ERR_OK. Successful. No error occured.
AdamGreen	0:616601bde9fb	136	* - ERR_USE. The specified IP address is already bound to by
AdamGreen	0:616601bde9fb	137	* another RAW PCB.
AdamGreen	0:616601bde9fb	138	*
AdamGreen	0:616601bde9fb	139	* @see raw_disconnect()
AdamGreen	0:616601bde9fb	140	*/
AdamGreen	0:616601bde9fb	141	err_t
AdamGreen	0:616601bde9fb	142	raw_bind(struct raw_pcb pcb, ip_addr_t ipaddr)
AdamGreen	0:616601bde9fb	143	{
AdamGreen	0:616601bde9fb	144	ip_addr_set(&pcb->local_ip, ipaddr);
AdamGreen	0:616601bde9fb	145	return ERR_OK;
AdamGreen	0:616601bde9fb	146	}
AdamGreen	0:616601bde9fb	147
AdamGreen	0:616601bde9fb	148	/**
AdamGreen	0:616601bde9fb	149	* Connect an RAW PCB. This function is required by upper layers
AdamGreen	0:616601bde9fb	150	* of lwip. Using the raw api you could use raw_sendto() instead
AdamGreen	0:616601bde9fb	151	*
AdamGreen	0:616601bde9fb	152	* This will associate the RAW PCB with the remote address.
AdamGreen	0:616601bde9fb	153	*
AdamGreen	0:616601bde9fb	154	* @param pcb RAW PCB to be connected with remote address ipaddr and port.
AdamGreen	0:616601bde9fb	155	* @param ipaddr remote IP address to connect with.
AdamGreen	0:616601bde9fb	156	*
AdamGreen	0:616601bde9fb	157	* @return lwIP error code
AdamGreen	0:616601bde9fb	158	*
AdamGreen	0:616601bde9fb	159	* @see raw_disconnect() and raw_sendto()
AdamGreen	0:616601bde9fb	160	*/
AdamGreen	0:616601bde9fb	161	err_t
AdamGreen	0:616601bde9fb	162	raw_connect(struct raw_pcb pcb, ip_addr_t ipaddr)
AdamGreen	0:616601bde9fb	163	{
AdamGreen	0:616601bde9fb	164	ip_addr_set(&pcb->remote_ip, ipaddr);
AdamGreen	0:616601bde9fb	165	return ERR_OK;
AdamGreen	0:616601bde9fb	166	}
AdamGreen	0:616601bde9fb	167
AdamGreen	0:616601bde9fb	168
AdamGreen	0:616601bde9fb	169	/**
AdamGreen	0:616601bde9fb	170	* Set the callback function for received packets that match the
AdamGreen	0:616601bde9fb	171	* raw PCB's protocol and binding.
AdamGreen	0:616601bde9fb	172	*
AdamGreen	0:616601bde9fb	173	* The callback function MUST either
AdamGreen	0:616601bde9fb	174	* - eat the packet by calling pbuf_free() and returning non-zero. The
AdamGreen	0:616601bde9fb	175	* packet will not be passed to other raw PCBs or other protocol layers.
AdamGreen	0:616601bde9fb	176	* - not free the packet, and return zero. The packet will be matched
AdamGreen	0:616601bde9fb	177	* against further PCBs and/or forwarded to another protocol layers.
AdamGreen	0:616601bde9fb	178	*
AdamGreen	0:616601bde9fb	179	* @return non-zero if the packet was free()d, zero if the packet remains
AdamGreen	0:616601bde9fb	180	* available for others.
AdamGreen	0:616601bde9fb	181	*/
AdamGreen	0:616601bde9fb	182	void
AdamGreen	0:616601bde9fb	183	raw_recv(struct raw_pcb pcb, raw_recv_fn recv, void recv_arg)
AdamGreen	0:616601bde9fb	184	{
AdamGreen	0:616601bde9fb	185	/* remember recv() callback and user data */
AdamGreen	0:616601bde9fb	186	pcb->recv = recv;
AdamGreen	0:616601bde9fb	187	pcb->recv_arg = recv_arg;
AdamGreen	0:616601bde9fb	188	}
AdamGreen	0:616601bde9fb	189
AdamGreen	0:616601bde9fb	190	/**
AdamGreen	0:616601bde9fb	191	* Send the raw IP packet to the given address. Note that actually you cannot
AdamGreen	0:616601bde9fb	192	* modify the IP headers (this is inconsistent with the receive callback where
AdamGreen	0:616601bde9fb	193	* you actually get the IP headers), you can only specify the IP payload here.
AdamGreen	0:616601bde9fb	194	* It requires some more changes in lwIP. (there will be a raw_send() function
AdamGreen	0:616601bde9fb	195	* then.)
AdamGreen	0:616601bde9fb	196	*
AdamGreen	0:616601bde9fb	197	* @param pcb the raw pcb which to send
AdamGreen	0:616601bde9fb	198	* @param p the IP payload to send
AdamGreen	0:616601bde9fb	199	* @param ipaddr the destination address of the IP packet
AdamGreen	0:616601bde9fb	200	*
AdamGreen	0:616601bde9fb	201	*/
AdamGreen	0:616601bde9fb	202	err_t
AdamGreen	0:616601bde9fb	203	raw_sendto(struct raw_pcb pcb, struct pbuf p, ip_addr_t *ipaddr)
AdamGreen	0:616601bde9fb	204	{
AdamGreen	0:616601bde9fb	205	err_t err;
AdamGreen	0:616601bde9fb	206	struct netif *netif;
AdamGreen	0:616601bde9fb	207	ip_addr_t *src_ip;
AdamGreen	0:616601bde9fb	208	struct pbuf q; / q will be sent down the stack */
AdamGreen	0:616601bde9fb	209
AdamGreen	0:616601bde9fb	210	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_sendto\n"));
AdamGreen	0:616601bde9fb	211
AdamGreen	0:616601bde9fb	212	/* not enough space to add an IP header to first pbuf in given p chain? */
AdamGreen	0:616601bde9fb	213	if (pbuf_header(p, IP_HLEN)) {
AdamGreen	0:616601bde9fb	214	/* allocate header in new pbuf */
AdamGreen	0:616601bde9fb	215	q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
AdamGreen	0:616601bde9fb	216	/* new header pbuf could not be allocated? */
AdamGreen	0:616601bde9fb	217	if (q == NULL) {
AdamGreen	0:616601bde9fb	218	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
AdamGreen	0:616601bde9fb	219	return ERR_MEM;
AdamGreen	0:616601bde9fb	220	}
AdamGreen	0:616601bde9fb	221	/* chain header q in front of given pbuf p */
AdamGreen	0:616601bde9fb	222	pbuf_chain(q, p);
AdamGreen	0:616601bde9fb	223	/* { first pbuf q points to header pbuf } */
AdamGreen	0:616601bde9fb	224	LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
AdamGreen	0:616601bde9fb	225	} else {
AdamGreen	0:616601bde9fb	226	/* first pbuf q equals given pbuf */
AdamGreen	0:616601bde9fb	227	q = p;
AdamGreen	0:616601bde9fb	228	if(pbuf_header(q, -IP_HLEN)) {
AdamGreen	0:616601bde9fb	229	LWIP_ASSERT("Can't restore header we just removed!", 0);
AdamGreen	0:616601bde9fb	230	return ERR_MEM;
AdamGreen	0:616601bde9fb	231	}
AdamGreen	0:616601bde9fb	232	}
AdamGreen	0:616601bde9fb	233
AdamGreen	0:616601bde9fb	234	if ((netif = ip_route(ipaddr)) == NULL) {
AdamGreen	0:616601bde9fb	235	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	236	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
AdamGreen	0:616601bde9fb	237	/* free any temporary header pbuf allocated by pbuf_header() */
AdamGreen	0:616601bde9fb	238	if (q != p) {
AdamGreen	0:616601bde9fb	239	pbuf_free(q);
AdamGreen	0:616601bde9fb	240	}
AdamGreen	0:616601bde9fb	241	return ERR_RTE;
AdamGreen	0:616601bde9fb	242	}
AdamGreen	0:616601bde9fb	243
AdamGreen	0:616601bde9fb	244	#if IP_SOF_BROADCAST
AdamGreen	0:616601bde9fb	245	/* broadcast filter? */
AdamGreen	0:616601bde9fb	246	if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
AdamGreen	0:616601bde9fb	247	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
AdamGreen	0:616601bde9fb	248	/* free any temporary header pbuf allocated by pbuf_header() */
AdamGreen	0:616601bde9fb	249	if (q != p) {
AdamGreen	0:616601bde9fb	250	pbuf_free(q);
AdamGreen	0:616601bde9fb	251	}
AdamGreen	0:616601bde9fb	252	return ERR_VAL;
AdamGreen	0:616601bde9fb	253	}
AdamGreen	0:616601bde9fb	254	#endif /* IP_SOF_BROADCAST */
AdamGreen	0:616601bde9fb	255
AdamGreen	0:616601bde9fb	256	if (ip_addr_isany(&pcb->local_ip)) {
AdamGreen	0:616601bde9fb	257	/* use outgoing network interface IP address as source address */
AdamGreen	0:616601bde9fb	258	src_ip = &(netif->ip_addr);
AdamGreen	0:616601bde9fb	259	} else {
AdamGreen	0:616601bde9fb	260	/* use RAW PCB local IP address as source address */
AdamGreen	0:616601bde9fb	261	src_ip = &(pcb->local_ip);
AdamGreen	0:616601bde9fb	262	}
AdamGreen	0:616601bde9fb	263
AdamGreen	0:616601bde9fb	264	#if LWIP_NETIF_HWADDRHINT
AdamGreen	0:616601bde9fb	265	netif->addr_hint = &(pcb->addr_hint);
AdamGreen	0:616601bde9fb	266	#endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen	0:616601bde9fb	267	err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
AdamGreen	0:616601bde9fb	268	#if LWIP_NETIF_HWADDRHINT
AdamGreen	0:616601bde9fb	269	netif->addr_hint = NULL;
AdamGreen	0:616601bde9fb	270	#endif /* LWIP_NETIF_HWADDRHINT*/
AdamGreen	0:616601bde9fb	271
AdamGreen	0:616601bde9fb	272	/* did we chain a header earlier? */
AdamGreen	0:616601bde9fb	273	if (q != p) {
AdamGreen	0:616601bde9fb	274	/* free the header */
AdamGreen	0:616601bde9fb	275	pbuf_free(q);
AdamGreen	0:616601bde9fb	276	}
AdamGreen	0:616601bde9fb	277	return err;
AdamGreen	0:616601bde9fb	278	}
AdamGreen	0:616601bde9fb	279
AdamGreen	0:616601bde9fb	280	/**
AdamGreen	0:616601bde9fb	281	* Send the raw IP packet to the address given by raw_connect()
AdamGreen	0:616601bde9fb	282	*
AdamGreen	0:616601bde9fb	283	* @param pcb the raw pcb which to send
AdamGreen	0:616601bde9fb	284	* @param p the IP payload to send
AdamGreen	0:616601bde9fb	285	*
AdamGreen	0:616601bde9fb	286	*/
AdamGreen	0:616601bde9fb	287	err_t
AdamGreen	0:616601bde9fb	288	raw_send(struct raw_pcb pcb, struct pbuf p)
AdamGreen	0:616601bde9fb	289	{
AdamGreen	0:616601bde9fb	290	return raw_sendto(pcb, p, &pcb->remote_ip);
AdamGreen	0:616601bde9fb	291	}
AdamGreen	0:616601bde9fb	292
AdamGreen	0:616601bde9fb	293	/**
AdamGreen	0:616601bde9fb	294	* Remove an RAW PCB.
AdamGreen	0:616601bde9fb	295	*
AdamGreen	0:616601bde9fb	296	* @param pcb RAW PCB to be removed. The PCB is removed from the list of
AdamGreen	0:616601bde9fb	297	* RAW PCB's and the data structure is freed from memory.
AdamGreen	0:616601bde9fb	298	*
AdamGreen	0:616601bde9fb	299	* @see raw_new()
AdamGreen	0:616601bde9fb	300	*/
AdamGreen	0:616601bde9fb	301	void
AdamGreen	0:616601bde9fb	302	raw_remove(struct raw_pcb *pcb)
AdamGreen	0:616601bde9fb	303	{
AdamGreen	0:616601bde9fb	304	struct raw_pcb *pcb2;
AdamGreen	0:616601bde9fb	305	/* pcb to be removed is first in list? */
AdamGreen	0:616601bde9fb	306	if (raw_pcbs == pcb) {
AdamGreen	0:616601bde9fb	307	/* make list start at 2nd pcb */
AdamGreen	0:616601bde9fb	308	raw_pcbs = raw_pcbs->next;
AdamGreen	0:616601bde9fb	309	/* pcb not 1st in list */
AdamGreen	0:616601bde9fb	310	} else {
AdamGreen	0:616601bde9fb	311	for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
AdamGreen	0:616601bde9fb	312	/* find pcb in raw_pcbs list */
AdamGreen	0:616601bde9fb	313	if (pcb2->next != NULL && pcb2->next == pcb) {
AdamGreen	0:616601bde9fb	314	/* remove pcb from list */
AdamGreen	0:616601bde9fb	315	pcb2->next = pcb->next;
AdamGreen	0:616601bde9fb	316	}
AdamGreen	0:616601bde9fb	317	}
AdamGreen	0:616601bde9fb	318	}
AdamGreen	0:616601bde9fb	319	memp_free(MEMP_RAW_PCB, pcb);
AdamGreen	0:616601bde9fb	320	}
AdamGreen	0:616601bde9fb	321
AdamGreen	0:616601bde9fb	322	/**
AdamGreen	0:616601bde9fb	323	* Create a RAW PCB.
AdamGreen	0:616601bde9fb	324	*
AdamGreen	0:616601bde9fb	325	* @return The RAW PCB which was created. NULL if the PCB data structure
AdamGreen	0:616601bde9fb	326	* could not be allocated.
AdamGreen	0:616601bde9fb	327	*
AdamGreen	0:616601bde9fb	328	* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
AdamGreen	0:616601bde9fb	329	*
AdamGreen	0:616601bde9fb	330	* @see raw_remove()
AdamGreen	0:616601bde9fb	331	*/
AdamGreen	0:616601bde9fb	332	struct raw_pcb *
AdamGreen	0:616601bde9fb	333	raw_new(u8_t proto)
AdamGreen	0:616601bde9fb	334	{
AdamGreen	0:616601bde9fb	335	struct raw_pcb *pcb;
AdamGreen	0:616601bde9fb	336
AdamGreen	0:616601bde9fb	337	LWIP_DEBUGF(RAW_DEBUG \| LWIP_DBG_TRACE, ("raw_new\n"));
AdamGreen	0:616601bde9fb	338
AdamGreen	0:616601bde9fb	339	pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
AdamGreen	0:616601bde9fb	340	/* could allocate RAW PCB? */
AdamGreen	0:616601bde9fb	341	if (pcb != NULL) {
AdamGreen	0:616601bde9fb	342	/* initialize PCB to all zeroes */
AdamGreen	0:616601bde9fb	343	memset(pcb, 0, sizeof(struct raw_pcb));
AdamGreen	0:616601bde9fb	344	pcb->protocol = proto;
AdamGreen	0:616601bde9fb	345	pcb->ttl = RAW_TTL;
AdamGreen	0:616601bde9fb	346	pcb->next = raw_pcbs;
AdamGreen	0:616601bde9fb	347	raw_pcbs = pcb;
AdamGreen	0:616601bde9fb	348	}
AdamGreen	0:616601bde9fb	349	return pcb;
AdamGreen	0:616601bde9fb	350	}
AdamGreen	0:616601bde9fb	351
AdamGreen	0:616601bde9fb	352	#endif /* LWIP_RAW */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/core/raw.c@0:616601bde9fb, 2012-02-23 (annotated)

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