On 2016-02-18 14:36, Grzegorz Bajorski wrote: > 2016-02-17 17:55 GMT+01:00 Felix Fietkau <nbd@xxxxxxxxxxx>: >> On 2016-02-17 12:55, Grzegorz Bajorski wrote: >>> Client interface briding was only possible when 4addr frames were used with >>> a 4addr/WDS aware AP. It was not possible to do it otherwise due to 3addr >>> frame limitation. >>> >>> The extap logic introduces a smart MAC address masking/translation >>> (including modyfing packets beyond SA/DA, e.g. DHCP broadcast flag is set). >>> >>> There are still some unsolved problems and bugs: >>> - due to bridge port routing and sk_buff payload sharing skb_copy() is >>> performed; this ideally should be reworked >>> - ipv6 support is still not finished >>> - extap is enabled by default currently; it should be configurable via >>> nl80211 the same way 4addr is >>> >>> There's also an idea to move this as a generic link driver (just like >>> macvlan, et al) which would allow unmodified cfg80211 drivers to enjoy the >>> extap functionality. Thoughts? >>> >>> Note: This changes cfg80211 file in this single patch only for reviewing >>> convienence. >>> >>> This is an early draft to solicit comments on the design. >>> >>> Signed-off-by: Grzegorz Bajorski <grzegorz.bajorski@xxxxxxxxx> >> You can get a lot of the same effect (sharing the same subnet between >> hosts behind multiple interfaces and having forwarding between them) >> without any changes to mac80211. >> >> OpenWrt uses a daemon called 'relayd' which I wrote some years ago. It >> does ARP translation, DHCP packet mangling and sets up policy routing to >> forward packets between multiple interfaces. >> >> You can find it here: >> http://git.openwrt.org/?p=project/relayd.git;a=summary >> git://git.openwrt.org/project/relayd.git >> >> Since you can cover the same use cases with user space code, I don't >> think it's a good idea to put bridge emulation hacks in the kernel's >> wireless stack. > > What about performance? Quick test show that is slow ~ 100-120 mbps > (UDP tests) and procesor is overloaded. Am I missing something? I > would expect it to be greater. (4 x 4 antena setup VHT80) What platform are you testing it on, and what kind of UDP test are you running? - Felix -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
