371 lines
13 KiB
C
371 lines
13 KiB
C
/****************************************************************************
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* net/ipforward/ipforward.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __NET_IPFORWARD_IPFORWARD_H
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#define __NET_IPFORWARD_IPFORWARD_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <stdint.h>
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#undef HAVE_FWDALLOC
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#ifdef CONFIG_NET_IPFORWARD
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define HAVE_FWDALLOC 1
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#ifndef CONFIG_NET_IPFORWARD_NSTRUCT
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# define CONFIG_NET_IPFORWARD_NSTRUCT 4
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#endif
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static_assert(CONFIG_IOB_NBUFFERS > CONFIG_NET_IPFORWARD_NSTRUCT,
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"IP forward may consume all the IOB and break netdev logic");
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/* Allocate a new IP forwarding data callback */
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#define ipfwd_callback_alloc(dev) devif_callback_alloc(dev, \
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&(dev)->d_conncb, \
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&(dev)->d_conncb_tail)
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#define ipfwd_callback_free(dev,cb) devif_dev_callback_free(dev, cb)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is the send state structure */
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struct devif_callback_s; /* Forward reference */
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struct net_driver_s; /* Forward reference */
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struct iob_s; /* Forward reference */
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struct forward_s
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{
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FAR struct forward_s *f_flink; /* Supports a singly linked list */
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FAR struct net_driver_s *f_dev; /* Forwarding device */
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FAR struct iob_s *f_iob; /* IOB chain containing the packet */
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FAR struct devif_callback_s *f_cb; /* Reference to callback instance */
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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uint8_t f_domain; /* Domain: PF_INET or PF_INET6 */
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#endif
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct ipv4_hdr_s; /* Forward reference */
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struct ipv6_hdr_s; /* Forward reference */
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/****************************************************************************
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* Name: ipfwd_initialize
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*
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* Description:
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* Initialize the struct forward_s allocator.
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*
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* Assumptions:
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* Called early in system initialization.
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*
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****************************************************************************/
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void ipfwd_initialize(void);
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/****************************************************************************
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* Name: ipfwd_alloc
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*
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* Description:
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* Allocate a forwarding structure by removing a pre-allocated entry from
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* a free list.
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*
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* Assumptions:
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* Caller holds the network lock. Mutually excluvive access to the free
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* list is assured by this lock.
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*
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****************************************************************************/
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FAR struct forward_s *ipfwd_alloc(void);
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/****************************************************************************
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* Name: ipfwd_free
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*
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* Description:
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* Free a forwarding structure by adding it to a free list.
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*
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* Assumptions:
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* Caller holds the network lock. Mutually excluvive access to the free
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* list is assured by this lock.
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*
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****************************************************************************/
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void ipfwd_free(FAR struct forward_s *fwd);
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/****************************************************************************
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* Name: ipv4_forward_broadcast
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*
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* Description:
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* This function is called from ipv4_input when a broadcast or multicast
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* packet is received. If CONFIG_NET_IPFORWARD_BROADCAST is enabled, this
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* function will forward the broadcast packet to other networks through
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* other network devices.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv4 packet.
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* ipv4 - A convenience pointer to the IPv4 header in within the IPv4
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* packet
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*
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* On input:
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* - dev->d_buf holds the received packet.
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* - dev->d_len holds the length of the received packet MINUS the
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* size of the L1 header. That was subtracted out by ipv4_input.
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* - ipv4 points to the IPv4 header with dev->d_buf.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPFORWARD_BROADCAST
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void ipv4_forward_broadcast(FAR struct net_driver_s *dev,
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FAR struct ipv4_hdr_s *ipv4);
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#endif
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/****************************************************************************
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* Name: ipv6_forward_broadcast
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*
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* Description:
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* This function is called from ipv6_input when a broadcast or multicast
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* packet is received. If CONFIG_NET_IPFORWARD_BROADCAST is enabled, this
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* function will forward the broadcast packet to other networks through
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* other network devices.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv6 packet.
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* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
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* packet
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*
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* On input:
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* - dev->d_buf holds the received packet.
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* - dev->d_len holds the length of the received packet MINUS the
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* size of the L1 header. That was subtracted out by ipv6_input.
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* - ipv6 points to the IPv6 header with dev->d_buf.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPFORWARD_BROADCAST
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void ipv6_forward_broadcast(FAR struct net_driver_s *dev,
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FAR struct ipv6_hdr_s *ipv6);
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#endif
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/****************************************************************************
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* Name: devif_forward
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*
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* Description:
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* Called from protocol-specific IP forwarding logic to re-send a packet.
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*
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* Input Parameters:
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* fwd - An initialized instance of the common forwarding structure that
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* includes everything needed to perform the forwarding operation.
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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void devif_forward(FAR struct forward_s *fwd);
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/****************************************************************************
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* Name: ipfwd_forward
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*
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* Description:
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* Called by the IP forwarding logic when a packet is received on one
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* network device, but must be forwarded on another network device.
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*
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* Set up to forward the packet on the specified device. This function
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* will set up a send event handler that will perform the actual send
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* asynchronously and must return without waiting for the send to
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* complete.
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*
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* Input Parameters:
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* fwd - An initialized instance of the common forwarding structure that
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* includes everything needed to perform the forwarding operation.
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*
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* Returned Value:
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* Zero is returned if the packet was successfully forwarded; A negated
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* errno value is returned if the packet is not forwardable. In that
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* latter case, the caller should free the IOB list and drop the packet.
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*
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****************************************************************************/
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int ipfwd_forward(FAR struct forward_s *fwd);
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/****************************************************************************
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* Name: ipfwd_poll
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*
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* Description:
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* Poll all pending transfer for ARP requests to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver indirectly through
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* devif_poll().
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*
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****************************************************************************/
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void ipfwd_poll(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: ipfwd_dropstats
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*
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* Description:
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* Update statistics for a dropped packet.
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*
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* Input Parameters:
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* fwd - The forwarding state structure
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_NET_STATISTICS
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void ipfwd_dropstats(FAR struct forward_s *fwd);
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#else
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# define ipfwd_dropstats(fwd)
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#endif
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/****************************************************************************
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* Name: ipv4_forward
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*
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* Description:
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* This function is called from ipv4_input when a packet is received that
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* is not destined for us. In this case, the packet may need to be
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* forwarded to another device (or sent back out the same device)
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* depending configuration, routing table information, and the IPv4
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* networks served by various network devices.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv4 packet.
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* ipv4 - A convenience pointer to the IPv4 header in within the IPv4
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* packet
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*
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* On input:
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* - dev->d_buf holds the received packet.
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* - dev->d_len holds the length of the received packet MINUS the
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* size of the L1 header. That was subtracted out by ipv4_input.
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* - ipv4 points to the IPv4 header with dev->d_buf.
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*
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* Returned Value:
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* Zero is returned if the packet was successfully forward; A negated
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* errno value is returned if the packet is not forwardable. In that
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* latter case, the caller (ipv4_input()) should drop the packet.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int ipv4_forward(FAR struct net_driver_s *dev, FAR struct ipv4_hdr_s *ipv4);
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#endif
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/****************************************************************************
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* Name: ipv6_forward
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*
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* Description:
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* This function is called from ipv6_input when a packet is received that
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* is not destined for us. In this case, the packet may need to be
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* forwarded to another device (or sent back out the same device)
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* depending configuration, routing table information, and the IPv6
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* networks served by various network devices.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv6 packet.
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* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
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* packet
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*
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* Returned Value:
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* Zero is returned if the packet was successfully forward; A negated
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* errno value is returned if the packet is not forwardable. In that
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* latter case, the caller (ipv6_input()) should drop the packet.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int ipv6_forward(FAR struct net_driver_s *dev, FAR struct ipv6_hdr_s *ipv6);
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#endif
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/****************************************************************************
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* Name: ipv6_dropstats
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*
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* Description:
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* Update statistics for a dropped Ipv6 packet.
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*
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* Input Parameters:
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* ipv6 - A pointer to the IPv6 header in within the IPv6 packet to be
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* dropped.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#if defined(CONFIG_NET_STATISTICS) && defined(CONFIG_NET_IPv6)
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void ipv6_dropstats(FAR struct ipv6_hdr_s *ipv6);
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#else
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# define ipv6_dropstats(ipv6)
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#endif
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/****************************************************************************
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* Name: ipv4_dropstats
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*
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* Description:
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* Update statistics for a dropped Ipv4 packet.
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*
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* Input Parameters:
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* ipv4 - A pointer to the IPv4 header in within the IPv4 packet to be
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* dropped.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#if defined(CONFIG_NET_STATISTICS) && defined(CONFIG_NET_IPv4)
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void ipv4_dropstats(FAR struct ipv4_hdr_s *ipv4);
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#else
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# define ipv4_dropstats(ipv4)
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#endif
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#endif /* CONFIG_NET_IPFORWARD */
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#endif /* __NET_IPFORWARD_IPFORWARD_H */
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