/** * @file * Raw Access module * */ /* * Copyright (c) 2001-2003 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels * */ /*-----------------------------------------------------------------------------------*/ /* raw.c * * The code for the Raw Access to the IP * */ /*-----------------------------------------------------------------------------------*/ #include "lwip/opt.h" #include "lwip/def.h" #include "lwip/memp.h" #include "lwip/inet.h" #include "lwip/netif.h" #include "lwip/ip_addr.h" #include "lwip/raw.h" #include "lwip/stats.h" #include "arch/perf.h" #include "lwip/snmp.h" #if LWIP_RAW /* The list of RAW PCBs */ static struct raw_pcb *raw_pcbs = NULL; /*-----------------------------------------------------------------------------------*/ void raw_init(void) { raw_pcbs = NULL; } /** * Determine if in incoming IP packet is covered by a RAW pcb and * and process it if possible * * Given an incoming UDP datagram (as a chain of pbufs) this function * finds a corresponding UDP PCB and * * @param pbuf pbuf to be demultiplexed to a UDP PCB. * @param netif network interface on which the datagram was received. * @return 0 if packet cannot be handled (pbuf needs to be freed then) * or 1 if the packet has been processed * */ int raw_input(struct pbuf *p, struct netif *inp) { struct raw_pcb *pcb; struct ip_hdr *iphdr; int proto; int rc = 0; iphdr = p->payload; proto = IPH_PROTO(iphdr); for(pcb = raw_pcbs; pcb != NULL; pcb = pcb->next) { if (pcb->protocol == proto) { if (pcb->recv) { pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src)); } pbuf_free(p); rc = 1; break; } } return rc; } /** * Bind a RAW PCB. * * @param pcb RAW PCB to be bound with a local address ipaddr. * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to * bind to all local interfaces. * * @return lwIP error code. * - ERR_OK. Successful. No error occured. * - ERR_USE. The specified ipaddr is already bound to by * another RAW PCB. * * @see raw_disconnect() */ err_t raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr) { ip_addr_set(&pcb->local_ip, ipaddr); return ERR_OK; } /*-----------------------------------------------------------------------------------*/ void raw_recv(struct raw_pcb *pcb, void (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p, struct ip_addr *addr), void *recv_arg) { /* remember recv() callback and user data */ pcb->recv = recv; pcb->recv_arg = recv_arg; } /** * Send the raw IP packet to the given address. Note that actually you cannot * modify the IP headers (this is inconsitent with the receive callback where * you actually get the IP headers), you can only specifiy the ip payload here. * It requires some more changes in LWIP. (there will be a raw_send() function * then) * * @param pcb the raw pcb which to send * @param p the ip payload to send * @param ipaddr the destination address of the whole IP packet * */ err_t raw_send_payload(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr) { err_t err; struct netif *netif; struct ip_addr *src_ip; LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("raw_send_payload\n")); if ((netif = ip_route(ipaddr)) == NULL) { LWIP_DEBUGF(UDP_DEBUG | 1, ("raw_send_payload: No route to 0x%lx\n", ipaddr)); #ifdef RAW_STATS /* ++lwip_stats.raw.rterr;*/ #endif /* UDP_STATS */ return ERR_RTE; } if (ip_addr_isany(&pcb->local_ip)) { /* use outgoing network interface IP address as source address */ src_ip = &(netif->ip_addr); } else { /* use UDP PCB local IP address as source address */ src_ip = &(pcb->local_ip); } err = ip_output_if (p, src_ip, ipaddr, 64, pcb->protocol, netif); return ERR_OK; } /** * Remove an RAW PCB. * * @param pcb RAW PCB to be removed. The PCB is removed from the list of * RAW PCB's and the data structure is freed from memory. * * @see raw_new() */ void raw_remove(struct raw_pcb *pcb) { struct raw_pcb *pcb2; /* pcb to be removed is first in list? */ if (raw_pcbs == pcb) { /* make list start at 2nd pcb */ raw_pcbs = raw_pcbs->next; /* pcb not 1st in list */ } else for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { /* find pcb in udp_pcbs list */ if (pcb2->next != NULL && pcb2->next == pcb) { /* remove pcb from list */ pcb2->next = pcb->next; } } memp_free(MEMP_RAW_PCB, pcb); } /** * Create a RAW PCB. * * @return The RAW PCB which was created. NULL if the PCB data structure * could not be allocated. * * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP) * * @see raw_remove() */ struct raw_pcb * raw_new(u16_t proto) { struct raw_pcb *pcb; LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_new\n")); pcb = memp_malloc(MEMP_RAW_PCB); /* could allocate RAW PCB? */ if (pcb != NULL) { /* initialize PCB to all zeroes */ memset(pcb, 0, sizeof(struct raw_pcb)); pcb->protocol = proto; pcb->next = raw_pcbs; raw_pcbs = pcb; } return pcb; } #endif /* LWIP_RAW */