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bpf: Allow a TCP CC to write sk_pacing_rate and sk_pacing_status

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A CC that implements tcp_congestion_ops.cong_control() should be able to
control sk_pacing_rate and set sk_pacing_status, since
tcp_update_pacing_rate() is never called in this case. A built-in CC or
one from a kernel module is already able to write to both struct sock
members. For a BPF program, write access has not been allowed, yet.

Signed-off-by: Jörn-Thorben Hinz <jthinz@mailbox.tu-berlin.de>
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220622191227.898118-2-jthinz@mailbox.tu-berlin.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jörn-Thorben Hinz 2022-06-22 21:12:23 +02:00 committed by Alexei Starovoitov
parent 9676feccac
commit 41c95dd6a6
1 changed files with 6 additions and 0 deletions
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6
net/ipv4/bpf_tcp_ca.c
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@ -111,6 +111,12 @@ static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
}
switch (off) {
case offsetof(struct sock, sk_pacing_rate):
end = offsetofend(struct sock, sk_pacing_rate);
break;
case offsetof(struct sock, sk_pacing_status):
end = offsetofend(struct sock, sk_pacing_status);
break;
case bpf_ctx_range(struct inet_connection_sock, icsk_ca_priv):
end = offsetofend(struct inet_connection_sock, icsk_ca_priv);
break;