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Sun, 13 Dec 2020 12:43:49 -0800 (PST) From: Victor Stewart To: io-uring@vger.kernel.org, soheil@google.com, netdev@vger.kernel.org, jannh@google.com Cc: Victor Stewart Subject: [PATCH v3] Allow UDP cmsghdrs through io_uring Date: Sun, 13 Dec 2020 20:43:39 +0000 Message-Id: <20201213204339.24445-2-v@nametag.social> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201213204339.24445-1-v@nametag.social> References: <20201213204339.24445-1-v@nametag.social> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org --- net/ipv4/af_inet.c | 1 + net/ipv6/af_inet6.c | 1 + net/socket.c | 8 +++++--- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index b7260c8cef2e..c9fd5e7cfd6e 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1052,6 +1052,7 @@ EXPORT_SYMBOL(inet_stream_ops); const struct proto_ops inet_dgram_ops = { .family = PF_INET, + .flags = PROTO_CMSG_DATA_ONLY, .owner = THIS_MODULE, .release = inet_release, .bind = inet_bind, diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index e648fbebb167..560f45009d06 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -695,6 +695,7 @@ const struct proto_ops inet6_stream_ops = { const struct proto_ops inet6_dgram_ops = { .family = PF_INET6, + .flags = PROTO_CMSG_DATA_ONLY, .owner = THIS_MODULE, .release = inet6_release, .bind = inet6_bind, diff --git a/net/socket.c b/net/socket.c index 6e6cccc2104f..6995835d6355 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2416,9 +2416,11 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, unsigned int flags) { - /* disallow ancillary data requests from this path */ - if (msg->msg_control || msg->msg_controllen) - return -EINVAL; + if (msg->msg_control || msg->msg_controllen) { + /* disallow ancillary data reqs unless cmsg is plain data */ + if (!(sock->ops->flags & PROTO_CMSG_DATA_ONLY)) + return -EINVAL; + } return ____sys_sendmsg(sock, msg, flags, NULL, 0); } -- 2.26.2