CODEWITHSUNDEEP
androidclinuxtcpandroid-ndk
the structure
the structure

Reputation: 89

TCP FAST OPEN on Android

Has anyone succeded to use TCP Fast Open Option on Android?

I use this code inside an Android NDK C program:

sfd = socket(AF_INET, SOCK_STREAM, 0); sendto(sfd, data, data_len, MSG_FASTOPEN, (struct sockaddr *) &server_addr, addr_len);

as suggested at http://lwn.net/Articles/508865/

It compiles fine both on Linux and Android.

It works flawlessy on Linux but on Android when it calls sendto() the program exits.

I tried it on Android 4.* and 5.1 (devices) and even on Android 6 (emulator only for now).

PS I noticed that on Android 4.* at /proc/sys/net/ipv4/ there's no tcp_fastopen file, on Android 5.1 the file is there but it contains 0.

Upvotes: 2

Views: 1803

Answers (1)

Mygod
Mygod

Reputation: 2180

TCP fast open requires Linux kernel 3.7+. Check the kernel version first.

Here's a sheet of kernel versions in AOSP. Note that it might to represent the real kernel version on your device.

If it's supported, you need to enable it using echo 3 > /proc/sys/net/ipv4/tcp_fastopen. It requires root permission.

Upvotes: 2

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