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/*
* Copyright (c) Espressif Systems (Shanghai) CO LTD
* 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.
*/
#include <string.h>
#include "lwip/prot/dhcp.h"
#include "lwip/dhcp.h"
#include "lwip/netif.h"
#include "lwip/prot/iana.h"
void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset)
{
LWIP_UNUSED_ARG(dhcp);
LWIP_UNUSED_ARG(state);
LWIP_UNUSED_ARG(option);
LWIP_UNUSED_ARG(len);
LWIP_UNUSED_ARG(p);
LWIP_UNUSED_ARG(offset);
#if LWIP_DHCP_ENABLE_MTU_UPDATE
if ((option == DHCP_OPTION_MTU) &&
(state == DHCP_STATE_REBOOTING || state == DHCP_STATE_REBINDING ||
state == DHCP_STATE_RENEWING || state == DHCP_STATE_REQUESTING)) {
u32_t mtu = 0;
struct netif *netif;
LWIP_ERROR("dhcp_parse_extra_opts(): MTU option's len != 2", len == 2, return;);
LWIP_ERROR("dhcp_parse_extra_opts(): extracting MTU option failed",
pbuf_copy_partial(p, &mtu, 2, offset) == 2, return;);
mtu = lwip_htons((u16_t)mtu);
NETIF_FOREACH(netif) {
/* find the netif related to this dhcp */
if (dhcp == netif_dhcp_data(netif)) {
if (mtu < netif->mtu) {
netif->mtu = mtu;
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_parse_extra_opts(): Negotiated netif MTU is %d\n", netif->mtu));
}
return;
}
}
} /* DHCP_OPTION_MTU */
#endif /* LWIP_DHCP_ENABLE_MTU_UPDATE */
}
void dhcp_append_extra_opts(struct netif *netif, uint8_t state, struct dhcp_msg *msg_out, uint16_t *options_out_len)
{
LWIP_UNUSED_ARG(netif);
LWIP_UNUSED_ARG(state);
LWIP_UNUSED_ARG(msg_out);
LWIP_UNUSED_ARG(options_out_len);
#if LWIP_DHCP_ENABLE_CLIENT_ID
if (state == DHCP_STATE_RENEWING || state == DHCP_STATE_REBINDING ||
state == DHCP_STATE_REBOOTING || state == DHCP_STATE_OFF ||
state == DHCP_STATE_REQUESTING || state == DHCP_STATE_BACKING_OFF || state == DHCP_STATE_SELECTING) {
size_t i;
u8_t *options = msg_out->options + *options_out_len;
LWIP_ERROR("dhcp_append(client_id): options_out_len + 3 + netif->hwaddr_len <= DHCP_OPTIONS_LEN",
*options_out_len + 3U + netif->hwaddr_len <= DHCP_OPTIONS_LEN, return;);
*options_out_len = *options_out_len + netif->hwaddr_len + 3;
*options++ = DHCP_OPTION_CLIENT_ID;
*options++ = netif->hwaddr_len + 1; /* option size */
*options++ = LWIP_IANA_HWTYPE_ETHERNET;
for (i = 0; i < netif->hwaddr_len; i++) {
*options++ = netif->hwaddr[i];
}
}
#endif /* LWIP_DHCP_ENABLE_CLIENT_ID */
}
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