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bpf: Add tcp_notsent_lowat bpf setsockopt 

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

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 Daniel Borkmann
parent c3f01fdced
commit eca43ee6c4
4 changed files with 25 additions and 2 deletions
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2
include/uapi/linux/bpf.h
View File

@ -1698,7 +1698,7 @@ 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

@ -4827,6 +4827,10 @@ 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

@ -1698,7 +1698,7 @@ 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

19
tools/testing/selftests/bpf/progs/connect4_prog.c
View File

@ -23,6 +23,10 @@
#define TCP_CA_NAME_MAX 16
#endif
#ifndef TCP_NOTSENT_LOWAT
#define TCP_NOTSENT_LOWAT 25
#endif
#ifndef IFNAMSIZ
#define IFNAMSIZ 16
#endif
@ -128,6 +132,18 @@ static __inline int set_keepalive(struct bpf_sock_addr *ctx)
return 0;
}
static __inline int set_notsent_lowat(struct bpf_sock_addr *ctx)
{
int lowat = 65535;
if (ctx->type == SOCK_STREAM) {
if (bpf_setsockopt(ctx, SOL_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat)))
return 1;
}
return 0;
}
SEC("cgroup/connect4")
int connect_v4_prog(struct bpf_sock_addr *ctx)
{
@ -148,6 +164,9 @@ int connect_v4_prog(struct bpf_sock_addr *ctx)
if (set_keepalive(ctx))
return 0;
if (set_notsent_lowat(ctx))
return 0;
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
return 0;
else if (ctx->type == SOCK_STREAM)