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////////////////////////////////////////////////////////////////////////////////
///
/// @file iface.c
///
/// @project
///
/// @brief Ethtool-based network interface APIs.
///
////////////////////////////////////////////////////////////////////////////////
///
////////////////////////////////////////////////////////////////////////////////
///
/// @copyright Copyright (c) 2018-2020, Evan Lojewski
/// @cond
///
/// 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. Neither the name of the copyright holder nor the
/// names of its contributors may be used to endorse or promote products
/// derived from this software without specific prior written permission.
///
////////////////////////////////////////////////////////////////////////////////
///
/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
/// @endcond
////////////////////////////////////////////////////////////////////////////////
#include <errno.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>
#include <malloc.h>
#include <net/if.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <types.h>
#define BCM_NVRAM_MAGIC (0x669955AAu)
/* Context for sub-commands */
struct cmd_context
{
int fd; /* socket for ethtool ioctl */
struct ifreq ifr; /* ifreq for ethtool ioctl */
};
static int do_ioctl(struct cmd_context *ctx, void *cmd)
{
ctx->ifr.ifr_data = (char *)cmd;
return ioctl(ctx->fd, SIOCETHTOOL, &ctx->ifr);
}
size_t bcmflash_ethtool_size(const char *name)
{
struct cmd_context ctx = { 0 };
strcpy(ctx.ifr.ifr_name, name);
ctx.fd = socket(AF_INET, SOCK_DGRAM, 0);
struct ethtool_drvinfo drvinfo;
drvinfo.cmd = ETHTOOL_GDRVINFO;
if (do_ioctl(&ctx, &drvinfo) < 0)
{
const char *errstr = strerror(errno);
printf("Cannot get driver information, %d: %s\n", errno, errstr);
return 0;
}
return drvinfo.eedump_len;
}
bool bcmflash_ethtool_read(const char *name, void *buffer, size_t len)
{
uint32_t address = 0;
uint32_t bytes = len;
uint32_t eeprom_size = bcmflash_ethtool_size(name);
struct cmd_context ctx = { 0 };
strcpy(ctx.ifr.ifr_name, name);
ctx.fd = socket(AF_INET, SOCK_DGRAM, 0);
// Limit reads to valid ranges. the ioctl will fail if we try to read past the end.
uint32_t end_address = address + bytes;
end_address = MIN(end_address, eeprom_size);
bytes = end_address - address;
struct ethtool_eeprom *eeprom;
eeprom = (struct ethtool_eeprom *)calloc(1, sizeof(struct ethtool_eeprom) + eeprom_size);
eeprom->cmd = ETHTOOL_GEEPROM;
eeprom->len = bytes;
eeprom->offset = address;
if (do_ioctl(&ctx, eeprom) < 0)
{
const char *errstr = strerror(errno);
printf("Cannot read eeprom, %d: %s\n", errno, errstr);
free(eeprom);
return false;
}
memcpy(buffer, &eeprom->data[0], bytes);
free(eeprom);
return true;
}
bool bcmflash_ethtool_write(const char *name, void *buffer, size_t len)
{
uint32_t address = 0;
uint32_t bytes = len;
uint32_t eeprom_size = bcmflash_ethtool_size(name);
struct cmd_context ctx = { 0 };
strcpy(ctx.ifr.ifr_name, name);
ctx.fd = socket(AF_INET, SOCK_DGRAM, 0);
uint32_t end_address = address + bytes;
bytes = end_address - address;
if (end_address > eeprom_size)
{
printf("Cannot write past the end of eeprom.\n");
return false;
}
struct ethtool_eeprom *eeprom;
eeprom = (struct ethtool_eeprom *)calloc(1, sizeof(struct ethtool_eeprom) + eeprom_size);
eeprom->cmd = ETHTOOL_SEEPROM;
eeprom->magic = BCM_NVRAM_MAGIC;
eeprom->len = bytes;
eeprom->offset = address;
memcpy(&eeprom->data[0], buffer, bytes);
if (do_ioctl(&ctx, eeprom) < 0)
{
printf("Cannot write eeprom");
free(eeprom);
return false;
}
free(eeprom);
return true;
}
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