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contrib/addons: Add example of using DHCP extra options hooks
This commit is contained in:
David Cermak
Simon Goldschmidt
parent
f50c87da6f
commit
187e4ededd
5
contrib/addons/dhcp_extra_opts/README
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5
contrib/addons/dhcp_extra_opts/README
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A simple example of using LWIP_HOOK_DHCP_PARSE/APPEND_OPTION hooks to implement:
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* DHCP_OPTION_MTU (option 26) to update the netif's MTU
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* DHCP_OPTION_CLIENT_ID (option 61) to advertize client's HW id of LWIP_IANA_HWTYPE_ETHERNET type
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Please follow the instructions in dhcp_extra_opts.h to add the hooks, definitions in lwipopts.h and enabling the extra options.
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91
contrib/addons/dhcp_extra_opts/dhcp_extra_opts.c
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91
contrib/addons/dhcp_extra_opts/dhcp_extra_opts.c
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/*
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* Copyright (c) Espressif Systems (Shanghai) CO LTD
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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. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "lwip/prot/dhcp.h"
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#include "lwip/dhcp.h"
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#include "lwip/netif.h"
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#include "lwip/prot/iana.h"
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void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset)
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{
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LWIP_UNUSED_ARG(dhcp);
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LWIP_UNUSED_ARG(state);
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LWIP_UNUSED_ARG(option);
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LWIP_UNUSED_ARG(len);
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LWIP_UNUSED_ARG(p);
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LWIP_UNUSED_ARG(offset);
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#if LWIP_DHCP_ENABLE_MTU_UPDATE
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if ((option == DHCP_OPTION_MTU) &&
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(state == DHCP_STATE_REBOOTING || state == DHCP_STATE_REBINDING ||
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state == DHCP_STATE_RENEWING || state == DHCP_STATE_REQUESTING)) {
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u32_t mtu = 0;
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struct netif *netif;
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LWIP_ERROR("dhcp_parse_extra_opts(): MTU option's len != 2", len == 2, return;);
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LWIP_ERROR("dhcp_parse_extra_opts(): extracting MTU option failed",
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pbuf_copy_partial(p, &mtu, 2, offset) == 2, return;);
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mtu = lwip_htons((u16_t)mtu);
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NETIF_FOREACH(netif) {
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/* find the netif related to this dhcp */
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if (dhcp == netif_dhcp_data(netif)) {
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if (mtu < netif->mtu) {
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netif->mtu = mtu;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_parse_extra_opts(): Negotiated netif MTU is %d\n", netif->mtu));
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}
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return;
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}
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}
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} /* DHCP_OPTION_MTU */
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#endif /* LWIP_DHCP_ENABLE_MTU_UPDATE */
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}
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void dhcp_append_extra_opts(struct netif *netif, uint8_t state, struct dhcp_msg *msg_out, uint16_t *options_out_len)
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{
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LWIP_UNUSED_ARG(netif);
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LWIP_UNUSED_ARG(state);
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LWIP_UNUSED_ARG(msg_out);
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LWIP_UNUSED_ARG(options_out_len);
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#if LWIP_DHCP_ENABLE_CLIENT_ID
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if (state == DHCP_STATE_RENEWING || state == DHCP_STATE_REBINDING ||
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state == DHCP_STATE_REBOOTING || state == DHCP_STATE_OFF ||
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state == DHCP_STATE_REQUESTING || state == DHCP_STATE_BACKING_OFF || state == DHCP_STATE_SELECTING) {
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size_t i;
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u8_t *options = msg_out->options + *options_out_len;
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LWIP_ERROR("dhcp_append(client_id): options_out_len + 3 + netif->hwaddr_len <= DHCP_OPTIONS_LEN",
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*options_out_len + 3U + netif->hwaddr_len <= DHCP_OPTIONS_LEN, return;);
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*options_out_len = *options_out_len + netif->hwaddr_len + 3;
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*options++ = DHCP_OPTION_CLIENT_ID;
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*options++ = netif->hwaddr_len + 1; /* option size */
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*options++ = LWIP_IANA_HWTYPE_ETHERNET;
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for (i = 0; i < netif->hwaddr_len; i++) {
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*options++ = netif->hwaddr[i];
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}
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}
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#endif /* LWIP_DHCP_ENABLE_CLIENT_ID */
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}
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61
contrib/addons/dhcp_extra_opts/dhcp_extra_opts.h
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61
contrib/addons/dhcp_extra_opts/dhcp_extra_opts.h
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@ -0,0 +1,61 @@
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/*
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* Copyright (c) Espressif Systems (Shanghai) CO LTD
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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. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* To use these additional DHCP options, make sure this file is included in LWIP_HOOK_FILENAME
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* and define these hooks:
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*
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* #define LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, offset) \
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* do { LWIP_UNUSED_ARG(msg); \
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* dhcp_parse_extra_opts(dhcp, state, option, len, pbuf, offset); \
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* } while(0)
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*
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* #define LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type, options_len_ptr) \
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* dhcp_append_extra_opts(netif, state, msg, options_len_ptr);
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*
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* To enable (disable) these option, please set one or both of the below macros to 1 (0)
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* #define LWIP_DHCP_ENABLE_MTU_UPDATE 1
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* #define LWIP_DHCP_ENABLE_CLIENT_ID 1
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*/
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#ifndef LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H
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#define LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H
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/* Add standard integers so the header could be included before lwip */
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#include <stdint.h>
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/* Forward declare lwip structs */
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struct dhcp;
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struct pbuf;
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struct dhcp;
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struct netif;
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struct dhcp_msg;
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/* Internal hook functions */
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void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset);
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void dhcp_append_extra_opts(struct netif *netif, uint8_t state, struct dhcp_msg *msg_out, uint16_t *options_out_len);
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#endif /* LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H */
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