diff options
Diffstat (limited to 'networking/udhcp/clientpacket.c')
| -rw-r--r-- | networking/udhcp/clientpacket.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/networking/udhcp/clientpacket.c b/networking/udhcp/clientpacket.c index 1ab17321d..3f9522ff8 100644 --- a/networking/udhcp/clientpacket.c +++ b/networking/udhcp/clientpacket.c @@ -78,6 +78,23 @@ static void add_param_req_option(struct dhcpMessage *packet) } } +/* RFC 2131 + * 4.4.4 Use of broadcast and unicast + * + * The DHCP client broadcasts DHCPDISCOVER, DHCPREQUEST and DHCPINFORM + * messages, unless the client knows the address of a DHCP server. + * The client unicasts DHCPRELEASE messages to the server. Because + * the client is declining the use of the IP address supplied by the server, + * the client broadcasts DHCPDECLINE messages. + * + * When the DHCP client knows the address of a DHCP server, in either + * INIT or REBOOTING state, the client may use that address + * in the DHCPDISCOVER or DHCPREQUEST rather than the IP broadcast address. + * The client may also use unicast to send DHCPINFORM messages + * to a known DHCP server. If the client receives no response to DHCP + * messages sent to the IP address of a known DHCP server, the DHCP + * client reverts to using the IP broadcast address. + */ static int raw_bcast_from_client_config_ifindex(struct dhcpMessage *packet) { @@ -90,7 +107,6 @@ static int raw_bcast_from_client_config_ifindex(struct dhcpMessage *packet) #if ENABLE_FEATURE_UDHCPC_ARPING /* Broadcast a DHCP decline message */ -//FIXME: maybe it should be unicast? int FAST_FUNC send_decline(uint32_t xid, uint32_t server, uint32_t requested) { struct dhcpMessage packet; @@ -128,7 +144,9 @@ int FAST_FUNC send_discover(uint32_t xid, uint32_t requested) /* Broadcasts a DHCP request message */ -//FIXME: maybe it should be unicast? +/* RFC 2131 3.1 paragraph 3: + * "The client _broadcasts_ a DHCPREQUEST message..." + */ int FAST_FUNC send_select(uint32_t xid, uint32_t server, uint32_t requested) { struct dhcpMessage packet; |