diff options
| author | Martin KaFai Lau <martin.lau@kernel.org> | 2022-09-01 17:28:21 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-02 20:34:31 -0700 |
| commit | d51bbff2aba7880c669e3ed1b4a5a64fed684bf0 (patch) | |
| tree | 9c69a298f91a5f6056782c9b35bd4f5218e32b5e /net/ipv4/tcp.c | |
| parent | 34704ef024ae6167c7ae9e67f671eb6bc1962c90 (diff) | |
| download | lwn-d51bbff2aba7880c669e3ed1b4a5a64fed684bf0.tar.gz lwn-d51bbff2aba7880c669e3ed1b4a5a64fed684bf0.zip | |
bpf: net: Avoid do_tcp_getsockopt() taking sk lock when called from bpf
Similar to the earlier commit that changed sk_setsockopt() to
use sockopt_{lock,release}_sock() such that it can avoid taking
lock when called from bpf. This patch also changes do_tcp_getsockopt()
to use sockopt_{lock,release}_sock() such that a latter patch can
make bpf_getsockopt(SOL_TCP) to reuse do_tcp_getsockopt().
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002821.2889765-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 108c430a2a11..45c737ee95a1 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4265,30 +4265,30 @@ static int do_tcp_getsockopt(struct sock *sk, int level, if (copy_from_sockptr(&len, optlen, sizeof(int))) return -EFAULT; - lock_sock(sk); + sockopt_lock_sock(sk); if (tp->saved_syn) { if (len < tcp_saved_syn_len(tp->saved_syn)) { len = tcp_saved_syn_len(tp->saved_syn); if (copy_to_sockptr(optlen, &len, sizeof(int))) { - release_sock(sk); + sockopt_release_sock(sk); return -EFAULT; } - release_sock(sk); + sockopt_release_sock(sk); return -EINVAL; } len = tcp_saved_syn_len(tp->saved_syn); if (copy_to_sockptr(optlen, &len, sizeof(int))) { - release_sock(sk); + sockopt_release_sock(sk); return -EFAULT; } if (copy_to_sockptr(optval, tp->saved_syn->data, len)) { - release_sock(sk); + sockopt_release_sock(sk); return -EFAULT; } tcp_saved_syn_free(tp); - release_sock(sk); + sockopt_release_sock(sk); } else { - release_sock(sk); + sockopt_release_sock(sk); len = 0; if (copy_to_sockptr(optlen, &len, sizeof(int))) return -EFAULT; @@ -4321,11 +4321,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level, return -EINVAL; if (zc.msg_flags & ~(TCP_VALID_ZC_MSG_FLAGS)) return -EINVAL; - lock_sock(sk); + sockopt_lock_sock(sk); err = tcp_zerocopy_receive(sk, &zc, &tss); err = BPF_CGROUP_RUN_PROG_GETSOCKOPT_KERN(sk, level, optname, &zc, &len, err); - release_sock(sk); + sockopt_release_sock(sk); if (len >= offsetofend(struct tcp_zerocopy_receive, msg_flags)) goto zerocopy_rcv_cmsg; switch (len) { |