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net/dhcp: Actually send out DHCPv4 DISCOVER and REQUEST messages

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Even though we were parsing some DHCP options sent by the server, so far
we are only using the BOOTP 2-way handshake, even when talking to a DHCP
server.

Change this by actually sending out DHCP DISCOVER packets instead of the
generic (mostly empty) BOOTP BOOTREQUEST packets.

A pure BOOTP server would ignore the extra DHCP options in the DISCOVER
packet and would just reply with a BOOTREPLY packet, which we also
handle in the code.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Andrei Borzenkov 2019-03-07 15:14:15 +00:00 • committed by Vincent Batts
parent ada2f6d40c
commit 723c3174e4
2 changed files with 123 additions and 18 deletions
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2
include/grub/net.h
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@ -463,9 +463,11 @@ enum
GRUB_NET_BOOTP_DOMAIN = 0x0f,
GRUB_NET_BOOTP_ROOT_PATH = 0x11,
GRUB_NET_BOOTP_EXTENSIONS_PATH = 0x12,
GRUB_NET_DHCP_REQUESTED_IP_ADDRESS = 50,
GRUB_NET_DHCP_OVERLOAD = 52,
GRUB_NET_DHCP_MESSAGE_TYPE = 53,
GRUB_NET_DHCP_SERVER_IDENTIFIER = 54,
GRUB_NET_DHCP_PARAMETER_REQUEST_LIST = 55,
GRUB_NET_DHCP_TFTP_SERVER_NAME = 66,
GRUB_NET_DHCP_BOOTFILE_NAME = 67,
GRUB_NET_BOOTP_END = 0xff