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BACKPORT: bpf: Add tcp_notsent_lowat bpf setsockopt

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Adding support for TCP_NOTSENT_LOWAT sockoption (https://lwn.net/Articles/560082/)
in tcp bpf programs.

Change-Id: Ib5d40f3a5c3b1ba7e0c6f40ca74754a89ba2966e
Signed-off-by: Nikita V. Shirokov <tehnerd@tehnerd.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20201009070325.226855-1-tehnerd@tehnerd.com
This commit is contained in:
Nikita V. Shirokov 2020-10-09 07:03:25 +00:00 • committed by basamaryan
commit f82f8a66a5
No known key found for this signature in database
GPG key ID: 210D5384FB2A5885
3 changed files with 6 additions and 2 deletions
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2
include/uapi/linux/bpf.h
View file

@ -1700,7 +1700,7 @@ union bpf_attr {
* **TCP_CONGESTION**, **TCP_BPF_IW**,
* **TCP_BPF_SNDCWND_CLAMP**, **TCP_SAVE_SYN**,
* **TCP_KEEPIDLE**, **TCP_KEEPINTVL**, **TCP_KEEPCNT**,
* **TCP_SYNCNT**, **TCP_USER_TIMEOUT**.
* **TCP_SYNCNT**, **TCP_USER_TIMEOUT**, **TCP_NOTSENT_LOWAT**.
* * **IPPROTO_IP**, which supports *optname* **IP_TOS**.
* * **IPPROTO_IPV6**, which supports *optname* **IPV6_TCLASS**.
* Return

4
net/core/filter.c
View file

@ -4892,6 +4892,10 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
else
icsk->icsk_user_timeout = val;
break;
case TCP_NOTSENT_LOWAT:
tp->notsent_lowat = val;
sk->sk_write_space(sk);
break;
default:
ret = -EINVAL;
}

2
tools/include/uapi/linux/bpf.h
View file

@ -1676,7 +1676,7 @@ union bpf_attr {
* **TCP_CONGESTION**, **TCP_BPF_IW**,
* **TCP_BPF_SNDCWND_CLAMP**, **TCP_SAVE_SYN**,
* **TCP_KEEPIDLE**, **TCP_KEEPINTVL**, **TCP_KEEPCNT**,
* **TCP_SYNCNT**, **TCP_USER_TIMEOUT**.
* **TCP_SYNCNT**, **TCP_USER_TIMEOUT**, **TCP_NOTSENT_LOWAT**.
* * **IPPROTO_IP**, which supports *optname* **IP_TOS**.
* * **IPPROTO_IPV6**, which supports *optname* **IPV6_TCLASS**.
* Return