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dhcp6: add MUD URL implementation

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This commit is contained in:
Jan Romann 2022-06-03 13:42:26 +02:00 committed by Jan Romann
parent b633639621
commit 7f69504bd3
2 changed files with 51 additions and 0 deletions
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44
src/core/ipv6/dhcp6.c
View File

@ -134,6 +134,11 @@ static u8_t dhcp6_pcb_refcount;
/* receive, unfold, parse and free incoming messages */
static void dhcp6_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port);
#if LWIP_DHCP6_MUD_URL
static u16_t dhcp6_option_mud_url(u16_t options_out_len, u8_t *options, char *mud_url, u16_t max_len);
#endif /* LWIP_DHCP6_MUD_URL */
/** Ensure DHCP PCB is allocated and bound */
static err_t
dhcp6_inc_pcb_refcount(void)
@ -411,6 +416,13 @@ dhcp6_create_msg(struct netif *netif, struct dhcp6 *dhcp6, u8_t message_type,
return p_out;
}
static u16_t
dhcp6_option_byte(u16_t options_out_len, u8_t *options, u16_t value)
{
options[options_out_len++] = value;
return options_out_len;
}
static u16_t
dhcp6_option_short(u16_t options_out_len, u8_t *options, u16_t value)
{
@ -438,6 +450,33 @@ dhcp6_option_optionrequest(u16_t options_out_len, u8_t *options, const u16_t *re
return ret;
}
#if LWIP_DHCP6_MUD_URL
static u16_t
dhcp6_option_mud_url(u16_t options_out_len, u8_t *options, char *mud_url, u16_t max_len)
{
size_t i;
u16_t ret;
size_t option_header_len = sizeof(u16_t) * 2;
size_t mud_url_len = strlen(mud_url);
const char *p = mud_url;
LWIP_ASSERT("dhcp6_option_mud_url: options_out_len + sizeof(struct dhcp6_msg) + mud_url_len <= max_len",
sizeof(struct dhcp6_msg) + options_out_len + option_header_len + mud_url_len <= max_len);
LWIP_ASSERT("DHCP: MUD URLs must start with https://",
strncmp(mud_url, "https://", 8) == 0);
LWIP_UNUSED_ARG(max_len);
ret = dhcp6_option_short(options_out_len, options, DHCP6_OPTION_MUD_URL_V6);
ret = dhcp6_option_short(ret, options, mud_url_len);
while (mud_url_len--) {
ret = dhcp6_option_byte(ret, options, *p++);
}
return ret;
}
#endif /* LWIP_DHCP6_MUD_URL */
/* All options are added, shrink the pbuf to the required size */
static void
dhcp6_msg_finalize(u16_t options_out_len, struct pbuf *p_out)
@ -475,6 +514,11 @@ dhcp6_information_request(struct netif *netif, struct dhcp6 *dhcp6)
options_out_len = dhcp6_option_optionrequest(options_out_len, options, requested_options,
LWIP_ARRAYSIZE(requested_options), p_out->len);
#if LWIP_DHCP6_MUD_URL
options_out_len = dhcp6_option_mud_url(options_out_len, options, LWIP_MUD_URL_STRING, p_out->len);
#endif /* LWIP_DHCP6_MUD_URL */
LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, DHCP6_STATE_REQUESTING_CONFIG, msg_out,
DHCP6_INFOREQUEST, options_out_len, p_out->len);
dhcp6_msg_finalize(options_out_len, p_out);

7
src/include/lwip/opt.h
View File

@ -2791,6 +2791,13 @@
#if !defined LWIP_DHCP6_MAX_DNS_SERVERS || defined __DOXYGEN__
#define LWIP_DHCP6_MAX_DNS_SERVERS DNS_MAX_SERVERS
#endif
/**
* LWIP_DHCP6_MUD_URL == 1: Emit Manufacturer Usage Description (MUD) URL (RFC 8520) via DHCPv6.
*/
#if !defined LWIP_DHCP6_MUD_URL || defined __DOXYGEN__
#define LWIP_DHCP6_MUD_URL 0
#endif
/**
* @}
*/