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dhcp: Add maximum message size option

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Add maximum message size option to keep some DHCP server implementations
from sending too big messages. See ConnMan commit
0c5c862749c05193cf4c513628328c6db02b5222.
This commit is contained in:
Patrik Flykt
2013-12-09 23:43:28 +02:00
committed by Zbigniew Jędrzejewski-Szmek
parent e2dfc79f06
commit 564ba3b0ef
2 changed files with 13 additions and 0 deletions
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12
src/libsystemd-dhcp/dhcp-client.c
View File

@@ -186,6 +186,7 @@ static int client_packet_init(sd_dhcp_client *client, uint8_t type,
uint8_t **opt, size_t *optlen)
{
int err;
be16_t max_size;
*opt = (uint8_t *)(message + 1);
@@ -229,6 +230,17 @@ static int client_packet_init(sd_dhcp_client *client, uint8_t type,
client->req_opts);
if (err < 0)
return err;
/* Some DHCP servers will send bigger DHCP packets than the
defined default size unless the Maximum Messge Size option
is explicitely set */
max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
DHCP_CLIENT_MIN_OPTIONS_SIZE);
err = dhcp_option_append(opt, optlen,
DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
2, &max_size);
if (err < 0)
return err;
}
return 0;

1
src/libsystemd-dhcp/dhcp-protocol.h
View File

@@ -111,6 +111,7 @@ enum {
DHCP_OPTION_MESSAGE_TYPE = 53,
DHCP_OPTION_SERVER_IDENTIFIER = 54,
DHCP_OPTION_PARAMETER_REQUEST_LIST = 55,
DHCP_OPTION_MAXIMUM_MESSAGE_SIZE = 57,
DHCP_OPTION_CLIENT_IDENTIFIER = 61,
DHCP_OPTION_END = 255,
};