1 /*
2 * Copyright (c) Espressif Systems (Shanghai) CO LTD
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holder nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #include <string.h>
29
30 #include "lwip/prot/dhcp.h"
31 #include "lwip/dhcp.h"
32 #include "lwip/netif.h"
33 #include "lwip/prot/iana.h"
34
35
dhcp_parse_extra_opts(struct dhcp * dhcp,uint8_t state,uint8_t option,uint8_t len,struct pbuf * p,uint16_t offset)36 void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset)
37 {
38 LWIP_UNUSED_ARG(dhcp);
39 LWIP_UNUSED_ARG(state);
40 LWIP_UNUSED_ARG(option);
41 LWIP_UNUSED_ARG(len);
42 LWIP_UNUSED_ARG(p);
43 LWIP_UNUSED_ARG(offset);
44 #if LWIP_DHCP_ENABLE_MTU_UPDATE
45 if ((option == DHCP_OPTION_MTU) &&
46 (state == DHCP_STATE_REBOOTING || state == DHCP_STATE_REBINDING ||
47 state == DHCP_STATE_RENEWING || state == DHCP_STATE_REQUESTING)) {
48 u32_t mtu = 0;
49 struct netif *netif;
50 LWIP_ERROR("dhcp_parse_extra_opts(): MTU option's len != 2", len == 2, return;);
51 LWIP_ERROR("dhcp_parse_extra_opts(): extracting MTU option failed",
52 pbuf_copy_partial(p, &mtu, 2, offset) == 2, return;);
53 mtu = lwip_htons((u16_t)mtu);
54 NETIF_FOREACH(netif) {
55 /* find the netif related to this dhcp */
56 if (dhcp == netif_dhcp_data(netif)) {
57 if (mtu < netif->mtu) {
58 netif->mtu = mtu;
59 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_parse_extra_opts(): Negotiated netif MTU is %d\n", netif->mtu));
60 }
61 return;
62 }
63 }
64 } /* DHCP_OPTION_MTU */
65 #endif /* LWIP_DHCP_ENABLE_MTU_UPDATE */
66 }
67
dhcp_append_extra_opts(struct netif * netif,uint8_t state,struct dhcp_msg * msg_out,uint16_t * options_out_len)68 void dhcp_append_extra_opts(struct netif *netif, uint8_t state, struct dhcp_msg *msg_out, uint16_t *options_out_len)
69 {
70 LWIP_UNUSED_ARG(netif);
71 LWIP_UNUSED_ARG(state);
72 LWIP_UNUSED_ARG(msg_out);
73 LWIP_UNUSED_ARG(options_out_len);
74 #if LWIP_DHCP_ENABLE_CLIENT_ID
75 if (state == DHCP_STATE_RENEWING || state == DHCP_STATE_REBINDING ||
76 state == DHCP_STATE_REBOOTING || state == DHCP_STATE_OFF ||
77 state == DHCP_STATE_REQUESTING || state == DHCP_STATE_BACKING_OFF || state == DHCP_STATE_SELECTING) {
78 size_t i;
79 u8_t *options = msg_out->options + *options_out_len;
80 LWIP_ERROR("dhcp_append(client_id): options_out_len + 3 + netif->hwaddr_len <= DHCP_OPTIONS_LEN",
81 *options_out_len + 3U + netif->hwaddr_len <= DHCP_OPTIONS_LEN, return;);
82 *options_out_len = *options_out_len + netif->hwaddr_len + 3;
83 *options++ = DHCP_OPTION_CLIENT_ID;
84 *options++ = netif->hwaddr_len + 1; /* option size */
85 *options++ = LWIP_IANA_HWTYPE_ETHERNET;
86 for (i = 0; i < netif->hwaddr_len; i++) {
87 *options++ = netif->hwaddr[i];
88 }
89 }
90 #endif /* LWIP_DHCP_ENABLE_CLIENT_ID */
91 }
92