Re: [PATCH v1] Support DHCPv6 and UEFI IPv6 PXE

[Andrei Borzenkov <arvidjaar@gmail.com>]

В Tue, 12 May 2015 16:49:47 +0800
Michael Chang <mchang@suse.com> пишет:

> This patch set tries to make support of configuring IPv6 network interface
> through the DHCPv6 protocol. A new command, net_bootp6, is therefore introduced
> to serve the purpose. You can think it as DHCPv6/IPv6 version of the existing
> net_bootp command.
> 

Note that spec actually suggests (requires?) that DHCPv6 transaction is
triggered by receiving Router Advertisement with M/O bits set.

> In addition to that, the UEFI IPv6 PXE support can be easily done by sharing
> the same routine with net_bootp6 to parse DHCPv6 Reply packet cached in the
> firmware.
> 

Looking in EFI spec I do not see it explaining what content this
dhcp_ack packet has for IPv6. I mean, DHCPv6 has neither Discover not
Acknowledge, and full DHCPv6 transaction requires *two* packets - one
for getting address and one for getting other options (DNS/boot
server). Let's see how it works in real world :)

> changes in v1:
> - Added upper boundary check in find_dhcpv6_option
> - Fix memory leak and freeing NULL pointer
> - Improved error message logging to not get lost
> - Use grub_cpu_to_be16_compile_time for endianess conversion when appropriate
> - Removed grub_dhcpv6_dns_servers structure and use 16 bytes blocks
> - Avoud magic numbers and use more descriptive sizeof when populating netbuff
> - Move include/grub/efi/api.h to UEFI IPv6 PXE support patch
> - Document the net_bootp6 command
> 
> 
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