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Message-Id: <20230817145554.892543-9-leitao@debian.org> Date: Thu, 17 Aug 2023 07:55:53 -0700 From: Breno Leitao <leitao@...ian.org> To: sdf@...gle.com, axboe@...nel.dk, asml.silence@...il.com, willemdebruijn.kernel@...il.com, martin.lau@...ux.dev Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, io-uring@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com, krisman@...e.de Subject: [PATCH v3 8/9] io_uring/cmd: BPF hook for getsockopt cmd Add BPF hook support for getsockopts io_uring command. So, BPF cgroups programs can run when SOCKET_URING_OP_GETSOCKOPT command is executed through io_uring. This implementation follows a similar approach to what __sys_getsockopt() does, but, using USER_SOCKPTR() for optval instead of kernel pointer. Signed-off-by: Breno Leitao <leitao@...ian.org> --- io_uring/uring_cmd.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index a567dd32df00..9e08a14760c3 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -5,6 +5,8 @@ #include <linux/io_uring.h> #include <linux/security.h> #include <linux/nospec.h> +#include <linux/compat.h> +#include <linux/bpf-cgroup.h> #include <uapi/linux/io_uring.h> #include <uapi/asm-generic/ioctls.h> @@ -184,17 +186,23 @@ static inline int io_uring_cmd_getsockopt(struct socket *sock, if (err) return err; - if (level == SOL_SOCKET) { + err = -EOPNOTSUPP; + if (level == SOL_SOCKET) err = sk_getsockopt(sock->sk, level, optname, USER_SOCKPTR(optval), KERNEL_SOCKPTR(&optlen)); - if (err) - return err; + if (!(issue_flags & IO_URING_F_COMPAT)) + err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, + optname, + USER_SOCKPTR(optval), + KERNEL_SOCKPTR(&optlen), + optlen, err); + + if (!err) return optlen; - } - return -EOPNOTSUPP; + return err; } static inline int io_uring_cmd_setsockopt(struct socket *sock, -- 2.34.1
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