--- /dev/null
+/**
+ * @file
+ * Implementation of raw protocol PCBs for low-level handling of
+ * different types of protocols besides (or overriding) those
+ * already available in lwIP.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 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 <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/raw.h"
+#include "lwip/stats.h"
+#include "arch/perf.h"
+
+#include <string.h>
+
+/** The list of RAW PCBs */
+static struct raw_pcb *raw_pcbs;
+
+/**
+ * Determine if in incoming IP packet is covered by a RAW PCB
+ * and if so, pass it to a user-provided receive callback function.
+ *
+ * Given an incoming IP datagram (as a chain of pbufs) this function
+ * finds a corresponding RAW PCB and calls the corresponding receive
+ * callback function.
+ *
+ * @param p pbuf to be demultiplexed to a RAW PCB.
+ * @param inp network interface on which the datagram was received.
+ * @return - 1 if the packet has been eaten by a RAW PCB receive
+ * callback function. The caller MAY NOT not reference the
+ * packet any longer, and MAY NOT call pbuf_free().
+ * @return - 0 if packet is not eaten (pbuf is still referenced by the
+ * caller).
+ *
+ */
+u8_t
+raw_input(struct pbuf *p, struct netif *inp)
+{
+ struct raw_pcb *pcb, *prev;
+ struct ip_hdr *iphdr;
+ s16_t proto;
+ u8_t eaten = 0;
+
+ LWIP_UNUSED_ARG(inp);
+
+ iphdr = (struct ip_hdr *)p->payload;
+ proto = IPH_PROTO(iphdr);
+
+ prev = NULL;
+ pcb = raw_pcbs;
+ /* loop through all raw pcbs until the packet is eaten by one */
+ /* this allows multiple pcbs to match against the packet by design */
+ while ((eaten == 0) && (pcb != NULL)) {
+ if ((pcb->protocol == proto) &&
+ (ip_addr_isany(&pcb->local_ip) ||
+ ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest))) {
+#if IP_SOF_BROADCAST_RECV
+ /* broadcast filter? */
+ if (ip_get_option(pcb, SOF_BROADCAST) || !ip_addr_isbroadcast(¤t_iphdr_dest, inp))
+#endif /* IP_SOF_BROADCAST_RECV */
+ {
+ /* receive callback function available? */
+ if (pcb->recv != NULL) {
+ /* the receive callback function did not eat the packet? */
+ if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
+ /* receive function ate the packet */
+ p = NULL;
+ eaten = 1;
+ if (prev != NULL) {
+ /* move the pcb to the front of raw_pcbs so that is
+ found faster next time */
+ prev->next = pcb->next;
+ pcb->next = raw_pcbs;
+ raw_pcbs = pcb;
+ }
+ }
+ }
+ /* no receive callback function was set for this raw PCB */
+ }
+ /* drop the packet */
+ }
+ prev = pcb;
+ pcb = pcb->next;
+ }
+ return eaten;
+}
+
+/**
+ * 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 IP address is already bound to by
+ * another RAW PCB.
+ *
+ * @see raw_disconnect()
+ */
+err_t
+raw_bind(struct raw_pcb *pcb, ip_addr_t *ipaddr)
+{
+ ip_addr_set(&pcb->local_ip, ipaddr);
+ return ERR_OK;
+}
+
+/**
+ * Connect an RAW PCB. This function is required by upper layers
+ * of lwip. Using the raw api you could use raw_sendto() instead
+ *
+ * This will associate the RAW PCB with the remote address.
+ *
+ * @param pcb RAW PCB to be connected with remote address ipaddr and port.
+ * @param ipaddr remote IP address to connect with.
+ *
+ * @return lwIP error code
+ *
+ * @see raw_disconnect() and raw_sendto()
+ */
+err_t
+raw_connect(struct raw_pcb *pcb, ip_addr_t *ipaddr)
+{
+ ip_addr_set(&pcb->remote_ip, ipaddr);
+ return ERR_OK;
+}
+
+
+/**
+ * Set the callback function for received packets that match the
+ * raw PCB's protocol and binding.
+ *
+ * The callback function MUST either
+ * - eat the packet by calling pbuf_free() and returning non-zero. The
+ * packet will not be passed to other raw PCBs or other protocol layers.
+ * - not free the packet, and return zero. The packet will be matched
+ * against further PCBs and/or forwarded to another protocol layers.
+ *
+ * @return non-zero if the packet was free()d, zero if the packet remains
+ * available for others.
+ */
+void
+raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, 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 inconsistent with the receive callback where
+ * you actually get the IP headers), you can only specify 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 IP packet
+ *
+ */
+err_t
+raw_sendto(struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *ipaddr)
+{
+ err_t err;
+ struct netif *netif;
+ ip_addr_t *src_ip;
+ struct pbuf *q; /* q will be sent down the stack */
+
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
+
+ /* not enough space to add an IP header to first pbuf in given p chain? */
+ if (pbuf_header(p, IP_HLEN)) {
+ /* allocate header in new pbuf */
+ q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
+ /* new header pbuf could not be allocated? */
+ if (q == NULL) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
+ return ERR_MEM;
+ }
+ if (p->tot_len != 0) {
+ /* chain header q in front of given pbuf p */
+ pbuf_chain(q, p);
+ }
+ /* { first pbuf q points to header pbuf } */
+ LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
+ } else {
+ /* first pbuf q equals given pbuf */
+ q = p;
+ if(pbuf_header(q, -IP_HLEN)) {
+ LWIP_ASSERT("Can't restore header we just removed!", 0);
+ return ERR_MEM;
+ }
+ }
+
+ if ((netif = ip_route(ipaddr)) == NULL) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
+ /* free any temporary header pbuf allocated by pbuf_header() */
+ if (q != p) {
+ pbuf_free(q);
+ }
+ return ERR_RTE;
+ }
+
+#if IP_SOF_BROADCAST
+ /* broadcast filter? */
+ if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(ipaddr, netif)) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
+ /* free any temporary header pbuf allocated by pbuf_header() */
+ if (q != p) {
+ pbuf_free(q);
+ }
+ return ERR_VAL;
+ }
+#endif /* IP_SOF_BROADCAST */
+
+ if (ip_addr_isany(&pcb->local_ip)) {
+ /* use outgoing network interface IP address as source address */
+ src_ip = &(netif->ip_addr);
+ } else {
+ /* use RAW PCB local IP address as source address */
+ src_ip = &(pcb->local_ip);
+ }
+
+ NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
+ err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
+ NETIF_SET_HWADDRHINT(netif, NULL);
+
+ /* did we chain a header earlier? */
+ if (q != p) {
+ /* free the header */
+ pbuf_free(q);
+ }
+ return err;
+}
+
+/**
+ * Send the raw IP packet to the address given by raw_connect()
+ *
+ * @param pcb the raw pcb which to send
+ * @param p the IP payload to send
+ *
+ */
+err_t
+raw_send(struct raw_pcb *pcb, struct pbuf *p)
+{
+ return raw_sendto(pcb, p, &pcb->remote_ip);
+}
+
+/**
+ * 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 raw_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(u8_t proto)
+{
+ struct raw_pcb *pcb;
+
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
+
+ pcb = (struct raw_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->ttl = RAW_TTL;
+ pcb->next = raw_pcbs;
+ raw_pcbs = pcb;
+ }
+ return pcb;
+}
+
+#endif /* LWIP_RAW */
projects / reactos.git / blobdiff