564 lines
19 KiB
C
564 lines
19 KiB
C
/**
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* @file
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* lwIP netif implementing an IEEE 802.1D MAC Bridge
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*/
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/*
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* Copyright (c) 2017 Simon Goldschmidt.
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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: Simon Goldschmidt <goldsimon@gmx.de>
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*
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*/
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/**
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* @defgroup bridgeif IEEE 802.1D bridge
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* @ingroup netifs
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* This file implements an IEEE 802.1D bridge by using a multilayer netif approach
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* (one hardware-independent netif for the bridge that uses hardware netifs for its ports).
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* On transmit, the bridge selects the outgoing port(s).
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* On receive, the port netif calls into the bridge (via its netif->input function) and
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* the bridge selects the port(s) (and/or its netif->input function) to pass the received pbuf to.
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*
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* Usage:
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* - add the port netifs just like you would when using them as dedicated netif without a bridge
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* - only NETIF_FLAG_ETHARP/NETIF_FLAG_ETHERNET netifs are supported as bridge ports
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* - add the bridge port netifs without IPv4 addresses (i.e. pass 'NULL, NULL, NULL')
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* - don't add IPv6 addresses to the port netifs!
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* - set up the bridge configuration in a global variable of type 'bridgeif_initdata_t' that contains
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* - the MAC address of the bridge
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* - some configuration options controlling the memory consumption (maximum number of ports
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* and FDB entries)
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* - e.g. for a bridge MAC address 00-01-02-03-04-05, 2 bridge ports, 1024 FDB entries + 16 static MAC entries:
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* bridgeif_initdata_t mybridge_initdata = BRIDGEIF_INITDATA1(2, 1024, 16, ETH_ADDR(0, 1, 2, 3, 4, 5));
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* - add the bridge netif (with IPv4 config):
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* struct netif bridge_netif;
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* netif_add(&bridge_netif, &my_ip, &my_netmask, &my_gw, &mybridge_initdata, bridgeif_init, tcpip_input);
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* NOTE: the passed 'input' function depends on BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT setting,
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* which controls where the forwarding is done (netif low level input context vs. tcpip_thread)
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* - set up all ports netifs and the bridge netif
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*
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* - When adding a port netif, NETIF_FLAG_ETHARP flag will be removed from a port
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* to prevent ETHARP working on that port netif (we only want one IP per bridge not per port).
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* - When adding a port netif, its input function is changed to call into the bridge.
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*
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*
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* @todo:
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* - compact static FDB entries (instead of walking the whole array)
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* - add FDB query/read access
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* - add FDB change callback (when learning or dropping auto-learned entries)
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* - prefill FDB with MAC classes that should never be forwarded
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* - multicast snooping? (and only forward group addresses to interested ports)
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* - support removing ports
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* - check SNMP integration
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* - VLAN handling / trunk ports
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* - priority handling? (although that largely depends on TX queue limitations and lwIP doesn't provide tx-done handling)
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*/
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#include "netif/bridgeif.h"
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#include "lwip/netif.h"
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#include "lwip/sys.h"
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#include "lwip/etharp.h"
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#include "lwip/ethip6.h"
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#include "lwip/snmp.h"
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#include "lwip/timeouts.h"
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#include <string.h>
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#if LWIP_NUM_NETIF_CLIENT_DATA
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/* Define those to better describe your network interface. */
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#define IFNAME0 'b'
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#define IFNAME1 'r'
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struct bridgeif_private_s;
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typedef struct bridgeif_port_private_s {
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struct bridgeif_private_s *bridge;
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struct netif *port_netif;
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u8_t port_num;
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} bridgeif_port_t;
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typedef struct bridgeif_fdb_static_entry_s {
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u8_t used;
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bridgeif_portmask_t dst_ports;
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struct eth_addr addr;
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} bridgeif_fdb_static_entry_t;
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typedef struct bridgeif_private_s {
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struct netif *netif;
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struct eth_addr ethaddr;
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u8_t max_ports;
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u8_t num_ports;
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bridgeif_port_t *ports;
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u16_t max_fdbs_entries;
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bridgeif_fdb_static_entry_t *fdbs;
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u16_t max_fdbd_entries;
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void *fdbd;
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} bridgeif_private_t;
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/* netif data index to get the bridge on input */
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u8_t bridgeif_netif_client_id = 0xff;
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/**
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* @ingroup bridgeif
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* Add a static entry to the forwarding database.
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* A static entry marks where frames to a specific eth address (unicast or group address) are
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* forwarded.
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* bits [0..(BRIDGEIF_MAX_PORTS-1)]: hw ports
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* bit [BRIDGEIF_MAX_PORTS]: cpu port
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* 0: drop
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*/
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err_t
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bridgeif_fdb_add(struct netif *bridgeif, const struct eth_addr *addr, bridgeif_portmask_t ports)
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{
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int i;
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bridgeif_private_t *br;
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BRIDGEIF_DECL_PROTECT(lev);
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LWIP_ASSERT("invalid netif", bridgeif != NULL);
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br = (bridgeif_private_t *)bridgeif->state;
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LWIP_ASSERT("invalid state", br != NULL);
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BRIDGEIF_READ_PROTECT(lev);
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for (i = 0; i < br->max_fdbs_entries; i++) {
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if (!br->fdbs[i].used) {
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BRIDGEIF_WRITE_PROTECT(lev);
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if (!br->fdbs[i].used) {
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br->fdbs[i].used = 1;
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br->fdbs[i].dst_ports = ports;
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memcpy(&br->fdbs[i].addr, addr, sizeof(struct eth_addr));
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BRIDGEIF_WRITE_UNPROTECT(lev);
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BRIDGEIF_READ_UNPROTECT(lev);
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return ERR_OK;
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}
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BRIDGEIF_WRITE_UNPROTECT(lev);
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}
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}
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BRIDGEIF_READ_UNPROTECT(lev);
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return ERR_MEM;
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}
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/**
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* @ingroup bridgeif
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* Remove a static entry from the forwarding database
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*/
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err_t
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bridgeif_fdb_remove(struct netif *bridgeif, const struct eth_addr *addr)
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{
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int i;
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bridgeif_private_t *br;
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BRIDGEIF_DECL_PROTECT(lev);
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LWIP_ASSERT("invalid netif", bridgeif != NULL);
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br = (bridgeif_private_t *)bridgeif->state;
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LWIP_ASSERT("invalid state", br != NULL);
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BRIDGEIF_READ_PROTECT(lev);
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for (i = 0; i < br->max_fdbs_entries; i++) {
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if (br->fdbs[i].used && !memcmp(&br->fdbs[i].addr, addr, sizeof(struct eth_addr))) {
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BRIDGEIF_WRITE_PROTECT(lev);
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if (br->fdbs[i].used && !memcmp(&br->fdbs[i].addr, addr, sizeof(struct eth_addr))) {
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memset(&br->fdbs[i], 0, sizeof(bridgeif_fdb_static_entry_t));
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BRIDGEIF_WRITE_UNPROTECT(lev);
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BRIDGEIF_READ_UNPROTECT(lev);
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return ERR_OK;
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}
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BRIDGEIF_WRITE_UNPROTECT(lev);
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}
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}
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BRIDGEIF_READ_UNPROTECT(lev);
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return ERR_VAL;
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}
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/** Get the forwarding port(s) (as bit mask) for the specified destination mac address */
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static bridgeif_portmask_t
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bridgeif_find_dst_ports(bridgeif_private_t *br, struct eth_addr *dst_addr)
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{
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int i;
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BRIDGEIF_DECL_PROTECT(lev);
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BRIDGEIF_READ_PROTECT(lev);
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/* first check for static entries */
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for (i = 0; i < br->max_fdbs_entries; i++) {
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if (br->fdbs[i].used) {
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if (!memcmp(&br->fdbs[i].addr, dst_addr, sizeof(struct eth_addr))) {
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bridgeif_portmask_t ret = br->fdbs[i].dst_ports;
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BRIDGEIF_READ_UNPROTECT(lev);
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return ret;
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}
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}
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}
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if (dst_addr->addr[0] & 1) {
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/* no match found: flood remaining group address */
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BRIDGEIF_READ_UNPROTECT(lev);
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return BR_FLOOD;
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}
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BRIDGEIF_READ_UNPROTECT(lev);
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/* no match found: check dynamic fdb for port or fall back to flooding */
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return bridgeif_fdb_get_dst_ports(br->fdbd, dst_addr);
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}
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/** Helper function to see if a destination mac belongs to the bridge
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* (bridge netif or one of the port netifs), in which case the frame
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* is sent to the cpu only.
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*/
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static int
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bridgeif_is_local_mac(bridgeif_private_t *br, struct eth_addr *addr)
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{
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int i;
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BRIDGEIF_DECL_PROTECT(lev);
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if (!memcmp(br->netif->hwaddr, addr, sizeof(struct eth_addr))) {
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return 1;
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}
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BRIDGEIF_READ_PROTECT(lev);
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for (i = 0; i < br->num_ports; i++) {
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struct netif *portif = br->ports[i].port_netif;
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if (portif != NULL) {
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if (!memcmp(portif->hwaddr, addr, sizeof(struct eth_addr))) {
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BRIDGEIF_READ_UNPROTECT(lev);
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return 1;
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}
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}
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}
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BRIDGEIF_READ_UNPROTECT(lev);
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return 0;
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}
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/* Output helper function */
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static err_t
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bridgeif_send_to_port(bridgeif_private_t *br, struct pbuf *p, u8_t dstport_idx)
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{
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if (dstport_idx < BRIDGEIF_MAX_PORTS) {
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/* possibly an external port */
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if (dstport_idx < br->max_ports) {
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struct netif *portif = br->ports[dstport_idx].port_netif;
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if ((portif != NULL) && (portif->linkoutput != NULL)) {
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/* prevent sending out to rx port */
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if (netif_get_index(portif) != p->if_idx) {
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if (netif_is_link_up(portif)) {
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LWIP_DEBUGF(BRIDGEIF_FW_DEBUG, ("br -> flood(%p:%d) -> %d\n", (void *)p, p->if_idx, netif_get_index(portif)));
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return portif->linkoutput(portif, p);
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}
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}
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}
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}
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} else {
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LWIP_ASSERT("invalid port index", dstport_idx == BRIDGEIF_MAX_PORTS);
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}
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return ERR_OK;
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}
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/** Helper function to pass a pbuf to all ports marked in 'dstports'
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*/
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static err_t
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bridgeif_send_to_ports(bridgeif_private_t *br, struct pbuf *p, bridgeif_portmask_t dstports)
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{
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err_t err, ret_err = ERR_OK;
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u8_t i;
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bridgeif_portmask_t mask = 1;
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BRIDGEIF_DECL_PROTECT(lev);
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BRIDGEIF_READ_PROTECT(lev);
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for (i = 0; i < BRIDGEIF_MAX_PORTS; i++, mask = (bridgeif_portmask_t)(mask << 1)) {
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if (dstports & mask) {
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err = bridgeif_send_to_port(br, p, i);
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if (err != ERR_OK) {
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ret_err = err;
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}
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}
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}
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BRIDGEIF_READ_UNPROTECT(lev);
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return ret_err;
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}
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/** Output function of the application port of the bridge (the one with an ip address).
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* The forwarding port(s) where this pbuf is sent on is/are automatically selected
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* from the FDB.
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*/
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static err_t
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bridgeif_output(struct netif *netif, struct pbuf *p)
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{
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err_t err;
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bridgeif_private_t *br = (bridgeif_private_t *)netif->state;
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struct eth_addr *dst = (struct eth_addr *)(p->payload);
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bridgeif_portmask_t dstports = bridgeif_find_dst_ports(br, dst);
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err = bridgeif_send_to_ports(br, p, dstports);
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MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p->tot_len);
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if (((u8_t *)p->payload)[0] & 1) {
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/* broadcast or multicast packet*/
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MIB2_STATS_NETIF_INC(netif, ifoutnucastpkts);
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} else {
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/* unicast packet */
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MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
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}
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/* increase ifoutdiscards or ifouterrors on error */
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LINK_STATS_INC(link.xmit);
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return err;
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}
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/** The actual bridge input function. Port netif's input is changed to call
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* here. This function decides where the frame is forwarded.
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*/
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static err_t
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bridgeif_input(struct pbuf *p, struct netif *netif)
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{
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u8_t rx_idx;
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bridgeif_portmask_t dstports;
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struct eth_addr *src, *dst;
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bridgeif_private_t *br;
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bridgeif_port_t *port;
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if (p == NULL || netif == NULL) {
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return ERR_VAL;
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}
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port = (bridgeif_port_t *)netif_get_client_data(netif, bridgeif_netif_client_id);
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LWIP_ASSERT("port data not set", port != NULL);
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if (port == NULL || port->bridge == NULL) {
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return ERR_VAL;
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}
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br = (bridgeif_private_t *)port->bridge;
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rx_idx = netif_get_index(netif);
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/* store receive index in pbuf */
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p->if_idx = rx_idx;
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dst = (struct eth_addr *)p->payload;
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src = (struct eth_addr *)(((u8_t *)p->payload) + sizeof(struct eth_addr));
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if ((src->addr[0] & 1) == 0) {
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/* update src for all non-group addresses */
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bridgeif_fdb_update_src(br->fdbd, src, port->port_num);
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}
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if (dst->addr[0] & 1) {
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/* group address -> flood + cpu? */
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dstports = bridgeif_find_dst_ports(br, dst);
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bridgeif_send_to_ports(br, p, dstports);
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if (dstports & (1 << BRIDGEIF_MAX_PORTS)) {
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/* we pass the reference to ->input or have to free it */
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LWIP_DEBUGF(BRIDGEIF_FW_DEBUG, ("br -> input(%p)\n", (void *)p));
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if (br->netif->input(p, br->netif) != ERR_OK) {
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pbuf_free(p);
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}
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} else {
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/* all references done */
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pbuf_free(p);
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}
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/* always return ERR_OK here to prevent the caller freeing the pbuf */
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return ERR_OK;
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} else {
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/* is this for one of the local ports? */
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if (bridgeif_is_local_mac(br, dst)) {
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/* yes, send to cpu port only */
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LWIP_DEBUGF(BRIDGEIF_FW_DEBUG, ("br -> input(%p)\n", (void *)p));
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return br->netif->input(p, br->netif);
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}
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/* get dst port */
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dstports = bridgeif_find_dst_ports(br, dst);
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bridgeif_send_to_ports(br, p, dstports);
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/* no need to send to cpu, flooding is for external ports only */
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/* by this, we consumed the pbuf */
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pbuf_free(p);
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/* always return ERR_OK here to prevent the caller freeing the pbuf */
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return ERR_OK;
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}
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}
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#if !BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT
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/** Input function for port netifs used to synchronize into tcpip_thread.
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*/
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static err_t
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bridgeif_tcpip_input(struct pbuf *p, struct netif *netif)
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{
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return tcpip_inpkt(p, netif, bridgeif_input);
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}
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#endif /* BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT */
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/**
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* @ingroup bridgeif
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* Initialization function passed to netif_add().
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*
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* ATTENTION: A pointer to a @ref bridgeif_initdata_t must be passed as 'state'
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* to @ref netif_add when adding the bridge. I supplies MAC address
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* and controls memory allocation (number of ports, FDB size).
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return ERR_OK if the loopif is initialized
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* ERR_MEM if private data couldn't be allocated
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* any other err_t on error
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*/
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err_t
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bridgeif_init(struct netif *netif)
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{
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bridgeif_initdata_t *init_data;
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bridgeif_private_t *br;
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size_t alloc_len_sizet;
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mem_size_t alloc_len;
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LWIP_ASSERT("netif != NULL", (netif != NULL));
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LWIP_ASSERT("bridgeif needs an input callback", (netif->input != NULL));
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#if !BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT
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if (netif->input == tcpip_input) {
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LWIP_DEBUGF(BRIDGEIF_DEBUG | LWIP_DBG_ON, ("bridgeif does not need tcpip_input, use netif_input/ethernet_input instead"));
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}
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#endif
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if (bridgeif_netif_client_id == 0xFF) {
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bridgeif_netif_client_id = netif_alloc_client_data_id();
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}
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init_data = (bridgeif_initdata_t *)netif->state;
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LWIP_ASSERT("init_data != NULL", (init_data != NULL));
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LWIP_ASSERT("init_data->max_ports <= BRIDGEIF_MAX_PORTS",
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init_data->max_ports <= BRIDGEIF_MAX_PORTS);
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alloc_len_sizet = sizeof(bridgeif_private_t) + (init_data->max_ports * sizeof(bridgeif_port_t) + (init_data->max_fdb_static_entries * sizeof(bridgeif_fdb_static_entry_t)));
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alloc_len = (mem_size_t)alloc_len_sizet;
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LWIP_ASSERT("alloc_len == alloc_len_sizet", alloc_len == alloc_len_sizet);
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LWIP_DEBUGF(BRIDGEIF_DEBUG, ("bridgeif_init: allocating %d bytes for private data\n", (int)alloc_len));
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br = (bridgeif_private_t *)mem_calloc(1, alloc_len);
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if (br == NULL) {
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LWIP_DEBUGF(NETIF_DEBUG, ("bridgeif_init: out of memory\n"));
|
|
return ERR_MEM;
|
|
}
|
|
memcpy(&br->ethaddr, &init_data->ethaddr, sizeof(br->ethaddr));
|
|
br->netif = netif;
|
|
|
|
br->max_ports = init_data->max_ports;
|
|
br->ports = (bridgeif_port_t *)(br + 1);
|
|
|
|
br->max_fdbs_entries = init_data->max_fdb_static_entries;
|
|
br->fdbs = (bridgeif_fdb_static_entry_t *)(((u8_t *)(br + 1)) + (init_data->max_ports * sizeof(bridgeif_port_t)));
|
|
|
|
br->max_fdbd_entries = init_data->max_fdb_dynamic_entries;
|
|
br->fdbd = bridgeif_fdb_init(init_data->max_fdb_dynamic_entries);
|
|
if (br->fdbd == NULL) {
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("bridgeif_init: out of memory in fdb_init\n"));
|
|
mem_free(br);
|
|
return ERR_MEM;
|
|
}
|
|
|
|
#if LWIP_NETIF_HOSTNAME
|
|
/* Initialize interface hostname */
|
|
netif->hostname = "lwip";
|
|
#endif /* LWIP_NETIF_HOSTNAME */
|
|
|
|
/*
|
|
* Initialize the snmp variables and counters inside the struct netif.
|
|
* The last argument should be replaced with your link speed, in units
|
|
* of bits per second.
|
|
*/
|
|
MIB2_INIT_NETIF(netif, snmp_ifType_ethernet_csmacd, 0);
|
|
|
|
netif->state = br;
|
|
netif->name[0] = IFNAME0;
|
|
netif->name[1] = IFNAME1;
|
|
/* We directly use etharp_output() here to save a function call.
|
|
* You can instead declare your own function an call etharp_output()
|
|
* from it if you have to do some checks before sending (e.g. if link
|
|
* is available...) */
|
|
#if LWIP_IPV4
|
|
netif->output = etharp_output;
|
|
#endif /* LWIP_IPV4 */
|
|
#if LWIP_IPV6
|
|
netif->output_ip6 = ethip6_output;
|
|
#endif /* LWIP_IPV6 */
|
|
netif->linkoutput = bridgeif_output;
|
|
|
|
/* set MAC hardware address length */
|
|
netif->hwaddr_len = ETH_HWADDR_LEN;
|
|
|
|
/* set MAC hardware address */
|
|
memcpy(netif->hwaddr, &br->ethaddr, ETH_HWADDR_LEN);
|
|
|
|
/* maximum transfer unit */
|
|
netif->mtu = 1500;
|
|
|
|
/* device capabilities */
|
|
/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
|
|
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP | NETIF_FLAG_MLD6 | NETIF_FLAG_LINK_UP;
|
|
|
|
#if LWIP_IPV6 && LWIP_IPV6_MLD
|
|
/*
|
|
* For hardware/netifs that implement MAC filtering.
|
|
* All-nodes link-local is handled by default, so we must let the hardware know
|
|
* to allow multicast packets in.
|
|
* Should set mld_mac_filter previously. */
|
|
if (netif->mld_mac_filter != NULL) {
|
|
ip6_addr_t ip6_allnodes_ll;
|
|
ip6_addr_set_allnodes_linklocal(&ip6_allnodes_ll);
|
|
netif->mld_mac_filter(netif, &ip6_allnodes_ll, NETIF_ADD_MAC_FILTER);
|
|
}
|
|
#endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* @ingroup bridgeif
|
|
* Add a port to the bridge
|
|
*/
|
|
err_t
|
|
bridgeif_add_port(struct netif *bridgeif, struct netif *portif)
|
|
{
|
|
bridgeif_private_t *br;
|
|
bridgeif_port_t *port;
|
|
|
|
LWIP_ASSERT("bridgeif != NULL", bridgeif != NULL);
|
|
LWIP_ASSERT("bridgeif->state != NULL", bridgeif->state != NULL);
|
|
LWIP_ASSERT("portif != NULL", portif != NULL);
|
|
|
|
if (!(portif->flags & NETIF_FLAG_ETHARP) || !(portif->flags & NETIF_FLAG_ETHERNET)) {
|
|
/* can only add ETHERNET/ETHARP interfaces */
|
|
return ERR_VAL;
|
|
}
|
|
|
|
br = (bridgeif_private_t *)bridgeif->state;
|
|
|
|
if (br->num_ports >= br->max_ports) {
|
|
return ERR_VAL;
|
|
}
|
|
port = &br->ports[br->num_ports];
|
|
port->port_netif = portif;
|
|
port->port_num = br->num_ports;
|
|
port->bridge = br;
|
|
br->num_ports++;
|
|
|
|
/* let the port call us on input */
|
|
#if BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT
|
|
portif->input = bridgeif_input;
|
|
#else
|
|
portif->input = bridgeif_tcpip_input;
|
|
#endif
|
|
/* store pointer to bridge in netif */
|
|
netif_set_client_data(portif, bridgeif_netif_client_id, port);
|
|
/* remove ETHARP flag to prevent sending report events on netif-up */
|
|
netif_clear_flags(portif, NETIF_FLAG_ETHARP);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
#endif /* LWIP_NUM_NETIF_CLIENT_DATA */
|