bpf: net: Change do_ip_setsockopt() to use the sockopt's lock_sock() …

…and capable()

Similar to the earlier patch that avoids sk_setsockopt() from
taking sk lock and doing capable test when called by bpf.  This patch
changes do_ip_setsockopt() to use the sockopt_{lock,release}_sock()
and sockopt_[ns_]capable().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061737.4176402-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

net/ipv4/ip_sockglue.c

@@ -944,7 +944,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 	err = 0;
 	if (needs_rtnl)
 		rtnl_lock();
-	lock_sock(sk);
+	sockopt_lock_sock(sk);
 
 	switch (optname) {
 	case IP_OPTIONS:
@@ -1333,14 +1333,14 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 	case IP_IPSEC_POLICY:
 	case IP_XFRM_POLICY:
 		err = -EPERM;
-		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+		if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
 			break;
 		err = xfrm_user_policy(sk, optname, optval, optlen);
 		break;
 
 	case IP_TRANSPARENT:
-		if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
-		    !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+		if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
+		    !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
 			err = -EPERM;
 			break;
 		}
@@ -1368,13 +1368,13 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 		err = -ENOPROTOOPT;
 		break;
 	}
-	release_sock(sk);
+	sockopt_release_sock(sk);
 	if (needs_rtnl)
 		rtnl_unlock();
 	return err;
 
 e_inval:
-	release_sock(sk);
+	sockopt_release_sock(sk);
 	if (needs_rtnl)
 		rtnl_unlock();
 	return -EINVAL;