327 lines
9.6 KiB
C
327 lines
9.6 KiB
C
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/**
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* @file
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*
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* Implementation of raw protocol PCBs for low-level handling of
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* different types of protocols besides (or overriding) those
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* already available in lwIP.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include <string.h>
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/memp.h"
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#include "lwip/inet.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/raw.h"
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#include "lwip/stats.h"
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#include "arch/perf.h"
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#include "lwip/snmp.h"
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#if LWIP_RAW
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/** The list of RAW PCBs */
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static struct raw_pcb *raw_pcbs = NULL;
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void
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raw_init(void)
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{
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raw_pcbs = NULL;
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}
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/**
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* Determine if in incoming IP packet is covered by a RAW PCB
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* and if so, pass it to a user-provided receive callback function.
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*
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* Given an incoming IP datagram (as a chain of pbufs) this function
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* finds a corresponding RAW PCB and calls the corresponding receive
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* callback function.
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*
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* @param pbuf pbuf to be demultiplexed to a RAW PCB.
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* @param netif network interface on which the datagram was received.
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* @Return - 1 if the packet has been eaten by a RAW PCB receive
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* callback function. The caller MAY NOT not reference the
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* packet any longer, and MAY NOT call pbuf_free().
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* @return - 0 if packet is not eaten (pbuf is still referenced by the
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* caller).
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*
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*/
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u8_t
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raw_input(struct pbuf *p, struct netif *inp)
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{
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struct raw_pcb *pcb;
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struct ip_hdr *iphdr;
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s16_t proto;
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u8_t eaten = 0;
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iphdr = p->payload;
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proto = IPH_PROTO(iphdr);
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pcb = raw_pcbs;
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/* loop through all raw pcbs until the packet is eaten by one */
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/* this allows multiple pcbs to match against the packet by design */
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while ((eaten == 0) && (pcb != NULL)) {
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if (pcb->protocol == proto) {
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/* receive callback function available? */
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if (pcb->recv != NULL) {
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/* the receive callback function did not eat the packet? */
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if (pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src)) != 0)
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{
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/* receive function ate the packet */
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p = NULL;
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eaten = 1;
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}
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}
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/* no receive callback function was set for this raw PCB */
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/* drop the packet */
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}
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pcb = pcb->next;
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}
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return eaten;
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}
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/**
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* Bind a RAW PCB.
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*
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* @param pcb RAW PCB to be bound with a local address ipaddr.
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* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
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* bind to all local interfaces.
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*
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* @return lwIP error code.
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* - ERR_OK. Successful. No error occured.
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* - ERR_USE. The specified IP address is already bound to by
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* another RAW PCB.
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*
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* @see raw_disconnect()
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*/
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err_t
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raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr)
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{
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ip_addr_set(&pcb->local_ip, ipaddr);
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return ERR_OK;
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}
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/**
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* Connect an RAW PCB. This function is required by upper layers
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* of lwip. Using the raw api you could use raw_sendto() instead
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*
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* This will associate the RAW PCB with the remote address.
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*
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* @param pcb RAW PCB to be connected with remote address ipaddr and port.
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* @param ipaddr remote IP address to connect with.
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*
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* @return lwIP error code
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*
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* @see raw_disconnect() and raw_sendto()
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*/
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err_t
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raw_connect(struct raw_pcb *pcb, struct ip_addr *ipaddr)
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{
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ip_addr_set(&pcb->remote_ip, ipaddr);
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return ERR_OK;
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}
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/**
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* Set the callback function for received packets that match the
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* raw PCB's protocol and binding.
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*
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* The callback function MUST either
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* - eat the packet by calling pbuf_free() and returning non-zero. The
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* packet will not be passed to other raw PCBs or other protocol layers.
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* - not free the packet, and return zero. The packet will be matched
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* against further PCBs and/or forwarded to another protocol layers.
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*
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* @return non-zero if the packet was free()d, zero if the packet remains
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* available for others.
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*/
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void
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raw_recv(struct raw_pcb *pcb,
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u8_t (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p,
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struct ip_addr *addr),
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void *recv_arg)
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{
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/* remember recv() callback and user data */
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pcb->recv = recv;
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pcb->recv_arg = recv_arg;
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}
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/**
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* Send the raw IP packet to the given address. Note that actually you cannot
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* modify the IP headers (this is inconsistent with the receive callback where
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* you actually get the IP headers), you can only specify the IP payload here.
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* It requires some more changes in lwIP. (there will be a raw_send() function
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* then.)
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*
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* @param pcb the raw pcb which to send
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* @param p the IP payload to send
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* @param ipaddr the destination address of the IP packet
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*
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*/
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err_t
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raw_sendto(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr)
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{
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err_t err;
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struct netif *netif;
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struct ip_addr *src_ip;
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struct pbuf *q; /* q will be sent down the stack */
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LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_sendto\n"));
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/* not enough space to add an IP header to first pbuf in given p chain? */
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if (pbuf_header(p, IP_HLEN)) {
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/* allocate header in new pbuf */
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q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
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/* new header pbuf could not be allocated? */
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if (q == NULL) {
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LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 2, ("raw_sendto: could not allocate header\n"));
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return ERR_MEM;
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}
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/* chain header q in front of given pbuf p */
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pbuf_chain(q, p);
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/* { first pbuf q points to header pbuf } */
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LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
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} else {
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/* first pbuf q equals given pbuf */
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q = p;
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pbuf_header(q, -IP_HLEN);
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}
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if ((netif = ip_route(ipaddr)) == NULL) {
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LWIP_DEBUGF(RAW_DEBUG | 1, ("raw_sendto: No route to 0x%"X32_F"\n", ipaddr->addr));
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#if RAW_STATS
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/* ++lwip_stats.raw.rterr;*/
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#endif /* RAW_STATS */
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/* free any temporary header pbuf allocated by pbuf_header() */
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if (q != p) {
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pbuf_free(q);
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}
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return ERR_RTE;
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}
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if (ip_addr_isany(&pcb->local_ip)) {
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/* use outgoing network interface IP address as source address */
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src_ip = &(netif->ip_addr);
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} else {
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/* use RAW PCB local IP address as source address */
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src_ip = &(pcb->local_ip);
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}
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err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
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/* did we chain a header earlier? */
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if (q != p) {
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/* free the header */
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pbuf_free(q);
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}
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return err;
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}
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/**
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* Send the raw IP packet to the address given by raw_connect()
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*
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* @param pcb the raw pcb which to send
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* @param p the IP payload to send
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* @param ipaddr the destination address of the IP packet
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*
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*/
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err_t
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raw_send(struct raw_pcb *pcb, struct pbuf *p)
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{
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return raw_sendto(pcb, p, &pcb->remote_ip);
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}
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/**
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* Remove an RAW PCB.
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*
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* @param pcb RAW PCB to be removed. The PCB is removed from the list of
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* RAW PCB's and the data structure is freed from memory.
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*
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* @see raw_new()
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*/
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void
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raw_remove(struct raw_pcb *pcb)
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{
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struct raw_pcb *pcb2;
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/* pcb to be removed is first in list? */
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if (raw_pcbs == pcb) {
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/* make list start at 2nd pcb */
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raw_pcbs = raw_pcbs->next;
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/* pcb not 1st in list */
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} else for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
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/* find pcb in raw_pcbs list */
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if (pcb2->next != NULL && pcb2->next == pcb) {
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/* remove pcb from list */
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pcb2->next = pcb->next;
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}
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}
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memp_free(MEMP_RAW_PCB, pcb);
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}
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/**
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* Create a RAW PCB.
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*
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* @return The RAW PCB which was created. NULL if the PCB data structure
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* could not be allocated.
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*
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* @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
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*
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* @see raw_remove()
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*/
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struct raw_pcb *
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raw_new(u16_t proto) {
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struct raw_pcb *pcb;
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LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_new\n"));
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pcb = memp_malloc(MEMP_RAW_PCB);
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/* could allocate RAW PCB? */
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if (pcb != NULL) {
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/* initialize PCB to all zeroes */
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memset(pcb, 0, sizeof(struct raw_pcb));
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pcb->protocol = proto;
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pcb->ttl = RAW_TTL;
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pcb->next = raw_pcbs;
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raw_pcbs = pcb;
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}
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return pcb;
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}
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#endif /* LWIP_RAW */
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