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[2a03:2880:31ff:10::face:b00c]) by smtp.gmail.com with ESMTPSA id n13-20020a170906b30d00b0099cc36c4681sm8596578ejz.157.2023.09.13.08.28.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Sep 2023 08:28:19 -0700 (PDT) From: Breno Leitao To: sdf@google.com, axboe@kernel.dk, asml.silence@gmail.com, willemdebruijn.kernel@gmail.com, kuba@kernel.org, pabeni@redhat.com, martin.lau@linux.dev, krisman@suse.de, "David S. Miller" , Eric Dumazet Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH v6 2/8] net/socket: Break down __sys_getsockopt Date: Wed, 13 Sep 2023 08:27:38 -0700 Message-Id: <20230913152744.2333228-3-leitao@debian.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230913152744.2333228-1-leitao@debian.org> References: <20230913152744.2333228-1-leitao@debian.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Split __sys_getsockopt() into two functions by removing the core logic into a sub-function (do_sock_getsockopt()). This will avoid code duplication when executing the same operation in other callers, for instance. do_sock_getsockopt() will be called by io_uring getsockopt() command operation in the following patch. Suggested-by: Martin KaFai Lau Signed-off-by: Breno Leitao --- include/net/sock.h | 3 +++ net/socket.c | 48 +++++++++++++++++++++++++++++----------------- 2 files changed, 33 insertions(+), 18 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index aa8fb54ad0af..fbd568a43d28 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1863,6 +1863,9 @@ int sock_setsockopt(struct socket *sock, int level, int op, sockptr_t optval, unsigned int optlen); int do_sock_setsockopt(struct socket *sock, bool compat, int level, int optname, char __user *user_optval, int optlen); +int do_sock_getsockopt(struct socket *sock, bool compat, int level, + int optname, char __user *user_optval, + int __user *user_optlen); int sk_getsockopt(struct sock *sk, int level, int optname, sockptr_t optval, sockptr_t optlen); diff --git a/net/socket.c b/net/socket.c index 360332e098d4..fb943602186e 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2333,28 +2333,17 @@ SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, int optname)); -/* - * Get a socket option. Because we don't know the option lengths we have - * to pass a user mode parameter for the protocols to sort out. - */ -int __sys_getsockopt(int fd, int level, int optname, char __user *optval, - int __user *optlen) +int do_sock_getsockopt(struct socket *sock, bool compat, int level, + int optname, char __user *optval, + int __user *optlen) { int max_optlen __maybe_unused; const struct proto_ops *ops; - int err, fput_needed; - struct socket *sock; - - sock = sockfd_lookup_light(fd, &err, &fput_needed); - if (!sock) - return err; + int err; err = security_socket_getsockopt(sock, level, optname); if (err) - goto out_put; - - if (!in_compat_syscall()) - max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); + return err; ops = READ_ONCE(sock->ops); if (level == SOL_SOCKET) @@ -2365,11 +2354,34 @@ int __sys_getsockopt(int fd, int level, int optname, char __user *optval, err = ops->getsockopt(sock, level, optname, optval, optlen); - if (!in_compat_syscall()) + if (!compat) { + max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, optval, optlen, max_optlen, err); -out_put: + } + + return err; +} +EXPORT_SYMBOL(do_sock_getsockopt); + +/* Get a socket option. Because we don't know the option lengths we have + * to pass a user mode parameter for the protocols to sort out. + */ +int __sys_getsockopt(int fd, int level, int optname, char __user *optval, + int __user *optlen) +{ + bool compat = in_compat_syscall(); + int err, fput_needed; + struct socket *sock; + + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (!sock) + return err; + + err = do_sock_getsockopt(sock, compat, level, optname, optval, + optlen); + fput_light(sock->file, fput_needed); return err; } -- 2.34.1