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bpf: Change bpf_setsockopt(SOL_TCP) to reuse do_tcp_setsockopt()

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After the prep work in the previous patches,
this patch removes all the dup code from bpf_setsockopt(SOL_TCP)
and reuses the do_tcp_setsockopt().

The existing optname white-list is refactored into a new
function sol_tcp_setsockopt().  The sol_tcp_setsockopt()
also calls the bpf_sol_tcp_setsockopt() to handle
the TCP_BPF_XXX specific optnames.

bpf_setsockopt(TCP_SAVE_SYN) now also allows a value 2 to
save the eth header also and it comes for free from
do_tcp_setsockopt().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061819.4180146-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau
2022-08-16 23:18:19 -07:00
committed by Alexei Starovoitov
parent 57db31a1a3
commit 0c751f7071
3 changed files with 34 additions and 69 deletions
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2
include/net/tcp.h
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@@ -405,6 +405,8 @@ __poll_t tcp_poll(struct file *file, struct socket *sock,
int tcp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
bool tcp_bpf_bypass_getsockopt(int level, int optname);
int do_tcp_setsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, unsigned int optlen);
int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
unsigned int optlen);
void tcp_set_keepalive(struct sock *sk, int val);