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author | Lawrence Brakmo | 2017-07-01 05:02:49 +0200 |
---|---|---|
committer | David S. Miller | 2017-07-02 01:15:14 +0200 |
commit | 91b5b21c7c16899abb37f4a9e4388b4e9aae0b9d (patch) | |
tree | ff5989374783d9f11e822906a98e94d08a6f135a /net/core/filter.c | |
parent | bpf: Sample BPF program to set buffer sizes (diff) | |
download | kernel-qcow2-linux-91b5b21c7c16899abb37f4a9e4388b4e9aae0b9d.tar.gz kernel-qcow2-linux-91b5b21c7c16899abb37f4a9e4388b4e9aae0b9d.tar.xz kernel-qcow2-linux-91b5b21c7c16899abb37f4a9e4388b4e9aae0b9d.zip |
bpf: Add support for changing congestion control
Added support for changing congestion control for SOCK_OPS bpf
programs through the setsockopt bpf helper function. It also adds
a new SOCK_OPS op, BPF_SOCK_OPS_NEEDS_ECN, that is needed for
congestion controls, like dctcp, that need to enable ECN in the
SYN packets.
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/filter.c')
-rw-r--r-- | net/core/filter.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index ca033e15d35e..12df52711fe8 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2719,8 +2719,24 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, } } else if (level == SOL_TCP && sk->sk_prot->setsockopt == tcp_setsockopt) { - /* Place holder */ +#ifdef CONFIG_INET + if (optname == TCP_CONGESTION) { + char name[TCP_CA_NAME_MAX]; + + strncpy(name, optval, min_t(long, optlen, + TCP_CA_NAME_MAX-1)); + name[TCP_CA_NAME_MAX-1] = 0; + ret = tcp_set_congestion_control(sk, name, false); + if (!ret && bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN) + /* replacing an existing ca */ + tcp_reinit_congestion_control(sk, + inet_csk(sk)->icsk_ca_ops); + } else { + ret = -EINVAL; + } +#else ret = -EINVAL; +#endif } else { ret = -EINVAL; } |