handle_dhcp() was first trying to learn the IP address of an associated
STA before doing broadcast-to-unicast conversion. This could result in
not converting some DHCPACK messages since the address learning part
aborts processing by returning from the function in various cases.
Reorder these operations to allow broadcast-to-unicast conversion to
happen even if an associated STA entry is not updated based on a
DHCPACK.
Signed-off-by: Jouni Malinen <j@w1.fi>
It was possible to hit a double-free on the l2_packet socket if
initialization of DHCP/NDISC snoop failed on a hostapd interface that
had previously had those enabled successfully. Fix this by clearing the
l2_packet pointers during deinit.
Signed-off-by: Jouni Malinen <j@w1.fi>
Do not depend on undefined behavior with pointer arithmetic when
checking whether there is sufficient room for an option.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
These can be reused for other purposes than just the DHCP snoofing for
Proxy ARP. In addition, use more complete definition of the parameters
based on the current IANA registry.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Use standard numbers-and-dots format for IPv4 in debug logs instead
of hexdump in two different byte orders.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This field needs to be validated in addition to validating the total
length of the received frame to avoid reading beyond the frame buffer.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
There is no point in trying to send the unicast converted version to a
STA that is not in authorized state since the driver would be expected
to drop normal TX Data frames in such state.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
These need to be marked packed to avoid issues with compilers
potentially adding padding between the fields (e.g., gcc on 64-bit
seemed to make struct icmpv6_ndmsg two octets too long which broke IPv6
address discovery).
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This replaces the use of Linux kernel header files (linux/ip.h,
linux/udp.h, linux/ipv6.h, and linux/icmpv6.h) with equivalent header
files from C library. In addition, ndisc_snoop.c is now built
conditionally on CONFIG_IPV6=y so that it is easier to handle hostapd
builds with toolchains that do not support IPv6 even if Hotspot 2.0 is
enabled in the build.
Signed-off-by: Jouni Malinen <j@w1.fi>
When DGAF Disable is on, perform multicast-to-unicast for DHCP packets
and Router Advertisement packets. This is a requirement for Hotspot 2.0.
Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
This allows adding/deleting an IPv6 neighbor entry to/from the bridge,
to which the BSS belongs. This commit adds the needed functionality in
driver_nl80211.c for the Linux bridge implementation. In theory, this
could be shared with multiple Linux driver interfaces, but for now, only
the main nl80211 interface is supported.
Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
Proxy ARP allows the AP devices to keep track of the hardware address to
IP address mapping of the STA devices within the BSS. When a request for
such information is made (i.e., ARP request, Neighbor Solicitation), the
AP will respond on behalf of the STA device within the BSS. Such
requests could originate from a device within the BSS or also from the
bridge. In the process of the AP replying to the request (i.e., ARP
reply, Neighbor Advertisement), the AP will drop the original request
frame. The relevant STA will not even know that such information was
ever requested.
This feature is a requirement for Hotspot 2.0, and is defined in IEEE
Std 802.11-2012, 10.23.13. While the Proxy ARP support code mainly
resides in the kernel bridge code, in order to optimize the performance
and simplify kernel implementation, the DHCP snooping code was added to
the hostapd.
Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
