ipv6 routing in grub2 is broken, we cannot talk to anything outside our local
network or anything that doesn't route in our global namespace.  This patch
fixes this by doing a couple of things

1) Read the router information off of the router advertisement.  If we have a
router lifetime we need to take the source address and create a route from it.

2) Changes the routing stuff slightly to allow you to specify a gateway _and_ an
interface.  Since the router advertisements come in on the link local address we
need to associate it with the global address on the card.  So when we are
processing the router advertisement, either use the SLAAC interface we create
and add the route to that interface, or loop through the global addresses we
currently have on our interface and associate it with one of those addresses.
We need to have a special case here for the default route so that it gets used,
we do this by setting the masksize to 0 to mean it encompasses all networks.
The routing code will automatically select the best route so if there is a
closer match we will use that.

With this patch I can now talk to ipv6 addresses outside of my local network.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>

* grub-core/net/bootp.c: Remove set_env_limn_ro.
* grub-core/net/net.c: Add grub_env_set_net_property.
* include/grub/net.h: Likewise.

* grub-core/net/arp.c (grub_net_arp_send_request): Increase network try
interval gradually.
* grub-core/net/icmp6.c (grub_net_icmp6_send_request): Likewise.
* grub-core/net/net.c (grub_net_fs_read_real): Likewise.
* grub-core/net/tftp.c (tftp_open): Likewise.
* include/grub/net.h (GRUB_NET_INTERVAL_ADDITION): New define.

	Just "packed" doesn't always pack the way we expect.

Adding multiple questions on a single DNS query is not supportted by
most DNS servers. This patch issues two separate DNS queries
sequentially for ipv4 and then for ipv6.

Fixes: https://savannah.gnu.org/bugs/?39710

 * grub-core/net/bootp.c (parse_dhcp_vendor): Add DNS option.
 * grub-core/net/dns.c (grub_dns_qtype_id): New enum.
 * (grub_net_dns_lookup): Now using separated dns packages.
 * (grub_cmd_nslookup): Add error condition.
 * (grub_cmd_list_dns): Print DNS option.
 * (grub_cmd_add_dns): Add four parameters: --only-ipv4,
 * --only-ipv6, --prefer-ipv4, and --prefer-ipv6.
 * include/grub/net.h (grub_dns_option_t): New enum.
 * (grub_net_network_level_address): option added.
Also-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>

	* grub-core/net/net.c (receive_packets): Decrease the stop to 10
	packets but stop only if stop condition is satisfied.
	(grub_net_fs_read_real): Call packets_pulled after real read. Use
	`stall' instead of `eof' as stop condition.
	* grub-core/net/http.c (parse_line): Set `stall' on EOF.
	(http_err): Likewise.
	* grub-core/net/tftp.c (ack): Replace the first argument with data
	instead of socket.
	(tftp_receive): Stall if too many packets are in wait queue.
	(tftp_packets_pulled): New function.
	(grub_tftp_protocol): Set packets_pulled.
	* include/grub/net.h (grub_net_packets): New field count.
	(grub_net_put_packet): Increment count.
	(grub_net_remove_packet): Likewise.
	(grub_net_app_protocol): New field `packets_pulled'.
	(grub_net): New field `stall'.

	* grub-core/net/bootp.c (parse_dhcp_vendor): Parse mask.
	(grub_net_configure_by_dhcp_ack): Use mask and grub_net_add_ipv4_local.
	* grub-core/net/net.c (grub_net_add_addr): Split creating local route
	into ...
	(grub_net_add_ipv4_local): ... this.
	(grub_cmd_addaddr): Use grub_net_add_ipv4_local.
	* include/grub/net.h (GRUB_NET_BOOTP_NETMASK): New enum value.
	(grub_net_add_ipv4_local): New proto.

	* include/grub/ieee1275/ieee1275.h (grub_ieee1275_flag): New enum values
	GRUB_IEEE1275_FLAG_NO_OFNET_SUFFIX and
	GRUB_IEEE1275_FLAG_VIRT_TO_REAL_BROKEN.
	* grub-core/net/drivers/efi/efinet.c (grub_efinet_findcards): Use
	txbufsize.
	* grub-core/kern/ieee1275/cmain.c (grub_ieee1275_find_options): Use
	compatible property to check for macs. Set
	GRUB_IEEE1275_FLAG_NO_OFNET_SUFFIX and
	GRUB_IEEE1275_FLAG_VIRT_TO_REAL_BROKEN on macs.
	* grub-core/net/drivers/ieee1275/ofnet.c (card_open): Don't add suffix
	if GRUB_IEEE1275_FLAG_NO_OFNET_SUFFIX is set.
	(send_card_buffer): Use txbuf.
	(grub_ofnet_findcards): Allocate txbuf. Simplify code flow and move
	nested function out of the parent while on it.

	* include/grub/net.h (grub_net_poll_cards): New argument stop_condition.
	All users updated.
	* grub-core/net/arp.c (have_pending): New var.
	(pending_req): Likewise.
	(grub_net_arp_send_request): Fill pending_req and use have_pending as
	stop indicator.
	(grub_net_arp_receive): Set have_pending.
	* grub-core/net/dns.c (recv_data): New field stop.
	(recv_hook): Set stop.
	(grub_net_dns_lookup): Init stop and use as stop condition.
	* grub-core/net/http.c (http_establish): Use headers_recv as stop
	condition.
	* grub-core/net/net.c (grub_net_poll_cards): New argument
	stop_condition. Stop when it goes true.
	* grub-core/net/tcp.c (grub_net_tcp_open): Use `established' as stop
	indicator.
	* grub-core/net/tftp.c (tftp_open): Use `have_oack' as stop indicator.

	* include/grub/net.h (grub_net_card_driver): Allow driver to modify
	card. All users updated.
	(grub_net_card): New members txbuf, rcvbuf, rcvbufsize and txbusy.
	* grub-core/net/drivers/efi/efinet.c (send_card_buffer): Reuse buffer.
	(get_card_packet): Likewise.
	(grub_efinet_findcards): Init new fields.

	compact and more efficient code.

	* grub-core/kern/list.c (grub_list_push): Moved from here ...
	* include/grub/list.h (grub_list_push): ... to here. Set prev.
	(grub_list_remove): Moved from here ...
	* include/grub/list.h (grub_list_remove): ... here. Use and set prev.
	(grub_prio_list_insert): Set prev.
	* include/grub/list.h (grub_list): Add prev. All users updated.

	redundant declaration.
	(FOR_NET_NETWORK_LEVEL_INTERFACES): Move to appropriate place.

	* grub-core/commands/i386/pc/sendkey.c (keysym): Add missing const.
	* grub-core/commands/lspci.c (grub_pci_classname): Likewise.
	* grub-core/commands/menuentry.c (hotkey_aliases): Likewise.
	* grub-core/disk/lvm.c (grub_lvm_getvalue): Likewise.
	(grub_lvm_check_flag): Likewise.
	* grub-core/efiemu/i386/coredetect.c
	(grub_efiemu_get_default_core_name): Likewise
	* grub-core/efiemu/main.c (grub_efiemu_autocore): Likewise.
	* grub-core/fs/hfsplus.c (grub_hfsplus_catkey_internal): Likewise.
	* grub-core/fs/ntfs.c (fixup): Likewise.
	* grub-core/fs/xfs.c (grub_xfs_iterate_dir): Likewise.
	* grub-core/fs/zfs/zfs.c (decomp_entry): Likewise.
	(fzap_lookup): Likewise.
	(zap_lookup): Likewise.
	* grub-core/gnulib/regcomp.c (init_dfa): Likewise.
	* grub-core/lib/legacy_parse.c (check_option): Likewise.
	* grub-core/lib/posix_wrap/langinfo.h (nl_langinfo): Likewise.
	* grub-core/loader/i386/bsd.c (grub_bsd_add_meta): Likewise.
	(grub_freebsd_add_meta_module): Likewise.
	(grub_cmd_freebsd_module): Likewise.
	* grub-core/loader/i386/xnu.c (tbl_alias): Likewise.
	* grub-core/loader/xnu.c (grub_xnu_register_memory): Likewise.
	(grub_xnu_writetree_get_size): Likewise.
	(grub_xnu_writetree_toheap_real): Likewise.
	(grub_xnu_find_key): Likewise.
	(grub_xnu_create_key): Likewise.
	(grub_xnu_create_value): Likewise.
	(grub_xnu_register_memory): Likewise.
	(grub_xnu_check_os_bundle_required): Likewise.
	(grub_xnu_scan_dir_for_kexts): Likewise.
	(grub_xnu_load_kext_from_dir): Likewise.
	* grub-core/normal/color.c (color_list): Likewise.
	* grub-core/normal/completion.c (current_word): Likewise.
	* grub-core/normal/menu_entry.c (insert_string): Likewise.
	* grub-core/term/serial.c (grub_serial_find): Likewise.
	* grub-core/term/tparm.c (grub_terminfo_tparm): Likewise.
	* include/grub/efiemu/efiemu.h (grub_efiemu_get_default_core_name):
	Likewise.
	* include/grub/i386/bsd.h (grub_bsd_add_meta): Likewise.
	(grub_freebsd_add_meta_module): Likewise.
	* include/grub/lib/arg.h (grub_arg_option): Likewise.
	* include/grub/net.h (grub_net_card_driver): Likewise.
	(grub_net_card): Likewise.
	(grub_net_app_protocol): Likewise.
	* include/grub/parttool.h (grub_parttool_argdesc): Likewise.
	* include/grub/serial.h (grub_serial_find): Likewise.
	* include/grub/tparm.h (grub_terminfo_tparm): Likewise.
	* include/grub/xnu.h (grub_xnu_create_key): Likewise.
	(grub_xnu_create_value): Likewise.
	(grub_xnu_find_key): Likewise.
	(grub_xnu_scan_dir_for_kexts): Likewise.
	(grub_xnu_load_kext_from_dir): Likewise.

	* include/grub/zfs/zio_checksum.h (zio_checksum_t): Moved from here ...
	* grub-core/fs/zfs/zfs.c (zio_checksum_t): ...here.
	* include/grub/zfs/zio_checksum.h (zio_checksum_info):
	Moved from here ...
	* grub-core/fs/zfs/zfs.c (zio_checksum_info): ... here. Added missing const.