diff options
| author | Martin KaFai Lau <martin.lau@kernel.org> | 2022-09-02 03:29:18 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-03 06:34:32 +0300 |
| commit | 273b7f0fb44847c41814a59901977be284daa447 (patch) | |
| tree | 5df174c0d3aa19ded01d74a70d305574e6237c80 /net/ipv4/tcp.c | |
| parent | 65ddc82d3b96be5555a36de4e2b4547433a00532 (diff) | |
| download | linux-273b7f0fb44847c41814a59901977be284daa447.tar.xz | |
bpf: Change bpf_getsockopt(SOL_TCP) to reuse do_tcp_getsockopt()
This patch changes bpf_getsockopt(SOL_TCP) to reuse
do_tcp_getsockopt(). It removes the duplicated code from
bpf_getsockopt(SOL_TCP).
Before this patch, there were some optnames available to
bpf_setsockopt(SOL_TCP) but missing in bpf_getsockopt(SOL_TCP).
For example, TCP_NODELAY, TCP_MAXSEG, TCP_KEEPIDLE, TCP_KEEPINTVL,
and a few more. It surprises users from time to time. This patch
automatically closes this gap without duplicating more code.
bpf_getsockopt(TCP_SAVED_SYN) does not free the saved_syn,
so it stays in sol_tcp_sockopt().
For string name value like TCP_CONGESTION, bpf expects it
is always null terminated, so sol_tcp_sockopt() decrements
optlen by one before calling do_tcp_getsockopt() and
the 'if (optlen < saved_optlen) memset(..,0,..);'
in __bpf_getsockopt() will always do a null termination.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002918.2894511-1-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 | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 45c737ee95a1..a822cc627e2a 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4043,8 +4043,8 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk, return stats; } -static int do_tcp_getsockopt(struct sock *sk, int level, - int optname, sockptr_t optval, sockptr_t optlen) +int do_tcp_getsockopt(struct sock *sk, int level, + int optname, sockptr_t optval, sockptr_t optlen) { struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); |