2016-02-18 15:08 GMT+01:00 Felix Fietkau <nbd@xxxxxxxxxxx>: > 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? My setup it is as follows: [laptop1] --eth-- [EA6500 AP] ~~rf~~ [AP148 STA w/ QCA99X0] --eth-- [laptop2]. I run UDP traffic between Laptop1 and Laptop2 using iperf. Laptop1: iperf -s -i1 -u Laptop2: iperf -i1 -c 192.168.1.108 -b 200M -t100 -u -P5 (without -P5, I got similar results) /Grzegorz -- 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
