[PATCH net-next 01/35] rxrpc: Implement an in-kernel rxperf server for testing purposes
From: David Howells
Date: Wed Nov 30 2022 - 11:55:46 EST
Implement an in-kernel rxperf server to allow kernel-based rxrpc services
to be tested directly, unlike with AFS where they're accessed by the
fileserver when the latter decides it wants to.
This is implemented as a module that, if loaded, opens UDP port 7009
(afs3-rmtsys) and listens on it for incoming calls. Calls can be generated
using the rxperf command shipped with OpenAFS, for example.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
---
include/net/af_rxrpc.h | 1
net/rxrpc/Kconfig | 7 +
net/rxrpc/Makefile | 3
net/rxrpc/rxperf.c | 619 ++++++++++++++++++++++++++++++++++++++++++++++++
net/rxrpc/server_key.c | 25 ++
5 files changed, 655 insertions(+)
create mode 100644 net/rxrpc/rxperf.c
diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
index b69ca695935c..dc033f08191e 100644
--- a/include/net/af_rxrpc.h
+++ b/include/net/af_rxrpc.h
@@ -71,5 +71,6 @@ void rxrpc_kernel_set_max_life(struct socket *, struct rxrpc_call *,
unsigned long);
int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val);
+int rxrpc_sock_set_security_keyring(struct sock *, struct key *);
#endif /* _NET_RXRPC_H */
diff --git a/net/rxrpc/Kconfig b/net/rxrpc/Kconfig
index accd35c05577..7ae023b37a83 100644
--- a/net/rxrpc/Kconfig
+++ b/net/rxrpc/Kconfig
@@ -58,4 +58,11 @@ config RXKAD
See Documentation/networking/rxrpc.rst.
+config RXPERF
+ tristate "RxRPC test service"
+ help
+ Provide an rxperf service tester. This listens on UDP port 7009 for
+ incoming calls from the rxperf program (an example of which can be
+ found in OpenAFS).
+
endif
diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
index fdeba488fc6e..79687477d93c 100644
--- a/net/rxrpc/Makefile
+++ b/net/rxrpc/Makefile
@@ -36,3 +36,6 @@ rxrpc-y := \
rxrpc-$(CONFIG_PROC_FS) += proc.o
rxrpc-$(CONFIG_RXKAD) += rxkad.o
rxrpc-$(CONFIG_SYSCTL) += sysctl.o
+
+
+obj-$(CONFIG_RXPERF) += rxperf.o
diff --git a/net/rxrpc/rxperf.c b/net/rxrpc/rxperf.c
new file mode 100644
index 000000000000..277ba18f575d
--- /dev/null
+++ b/net/rxrpc/rxperf.c
@@ -0,0 +1,619 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* In-kernel rxperf server for testing purposes.
+ *
+ * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@xxxxxxxxxx)
+ */
+
+#define pr_fmt(fmt) "rxperf: " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+
+MODULE_DESCRIPTION("rxperf test server (afs)");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+#define RXPERF_PORT 7009
+#define RX_PERF_SERVICE 147
+#define RX_PERF_VERSION 3
+#define RX_PERF_SEND 0
+#define RX_PERF_RECV 1
+#define RX_PERF_RPC 3
+#define RX_PERF_FILE 4
+#define RX_PERF_MAGIC_COOKIE 0x4711
+
+struct rxperf_proto_params {
+ __be32 version;
+ __be32 type;
+ __be32 rsize;
+ __be32 wsize;
+} __packed;
+
+static const u8 rxperf_magic_cookie[] = { 0x00, 0x00, 0x47, 0x11 };
+static const u8 secret[8] = { 0xa7, 0x83, 0x8a, 0xcb, 0xc7, 0x83, 0xec, 0x94 };
+
+enum rxperf_call_state {
+ RXPERF_CALL_SV_AWAIT_PARAMS, /* Server: Awaiting parameter block */
+ RXPERF_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
+ RXPERF_CALL_SV_REPLYING, /* Server: Replying */
+ RXPERF_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
+ RXPERF_CALL_COMPLETE, /* Completed or failed */
+};
+
+struct rxperf_call {
+ struct rxrpc_call *rxcall;
+ struct iov_iter iter;
+ struct kvec kvec[1];
+ struct work_struct work;
+ const char *type;
+ size_t iov_len;
+ size_t req_len; /* Size of request blob */
+ size_t reply_len; /* Size of reply blob */
+ unsigned int debug_id;
+ unsigned int operation_id;
+ struct rxperf_proto_params params;
+ __be32 tmp[2];
+ s32 abort_code;
+ enum rxperf_call_state state;
+ short error;
+ unsigned short unmarshal;
+ u16 service_id;
+ int (*deliver)(struct rxperf_call *call);
+ void (*processor)(struct work_struct *work);
+};
+
+static struct socket *rxperf_socket;
+static struct key *rxperf_sec_keyring; /* Ring of security/crypto keys */
+static struct workqueue_struct *rxperf_workqueue;
+
+static void rxperf_deliver_to_call(struct work_struct *work);
+static int rxperf_deliver_param_block(struct rxperf_call *call);
+static int rxperf_deliver_request(struct rxperf_call *call);
+static int rxperf_process_call(struct rxperf_call *call);
+static void rxperf_charge_preallocation(struct work_struct *work);
+
+static DECLARE_WORK(rxperf_charge_preallocation_work,
+ rxperf_charge_preallocation);
+
+static inline void rxperf_set_call_state(struct rxperf_call *call,
+ enum rxperf_call_state to)
+{
+ call->state = to;
+}
+
+static inline void rxperf_set_call_complete(struct rxperf_call *call,
+ int error, s32 remote_abort)
+{
+ if (call->state != RXPERF_CALL_COMPLETE) {
+ call->abort_code = remote_abort;
+ call->error = error;
+ call->state = RXPERF_CALL_COMPLETE;
+ }
+}
+
+static void rxperf_rx_discard_new_call(struct rxrpc_call *rxcall,
+ unsigned long user_call_ID)
+{
+ kfree((struct rxperf_call *)user_call_ID);
+}
+
+static void rxperf_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long user_call_ID)
+{
+ queue_work(rxperf_workqueue, &rxperf_charge_preallocation_work);
+}
+
+static void rxperf_queue_call_work(struct rxperf_call *call)
+{
+ queue_work(rxperf_workqueue, &call->work);
+}
+
+static void rxperf_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ struct rxperf_call *call = (struct rxperf_call *)call_user_ID;
+
+ if (call->state != RXPERF_CALL_COMPLETE)
+ rxperf_queue_call_work(call);
+}
+
+static void rxperf_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
+{
+ struct rxperf_call *call = (struct rxperf_call *)user_call_ID;
+
+ call->rxcall = rxcall;
+}
+
+static void rxperf_notify_end_reply_tx(struct sock *sock,
+ struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ rxperf_set_call_state((struct rxperf_call *)call_user_ID,
+ RXPERF_CALL_SV_AWAIT_ACK);
+}
+
+/*
+ * Charge the incoming call preallocation.
+ */
+static void rxperf_charge_preallocation(struct work_struct *work)
+{
+ struct rxperf_call *call;
+
+ for (;;) {
+ call = kzalloc(sizeof(*call), GFP_KERNEL);
+ if (!call)
+ break;
+
+ call->type = "unset";
+ call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ call->deliver = rxperf_deliver_param_block;
+ call->state = RXPERF_CALL_SV_AWAIT_PARAMS;
+ call->service_id = RX_PERF_SERVICE;
+ call->iov_len = sizeof(call->params);
+ call->kvec[0].iov_len = sizeof(call->params);
+ call->kvec[0].iov_base = &call->params;
+ iov_iter_kvec(&call->iter, READ, call->kvec, 1, call->iov_len);
+ INIT_WORK(&call->work, rxperf_deliver_to_call);
+
+ if (rxrpc_kernel_charge_accept(rxperf_socket,
+ rxperf_notify_rx,
+ rxperf_rx_attach,
+ (unsigned long)call,
+ GFP_KERNEL,
+ call->debug_id) < 0)
+ break;
+ call = NULL;
+ }
+
+ kfree(call);
+}
+
+/*
+ * Open an rxrpc socket and bind it to be a server for callback notifications
+ * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
+ */
+static int rxperf_open_socket(void)
+{
+ struct sockaddr_rxrpc srx;
+ struct socket *socket;
+ int ret;
+
+ ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET6,
+ &socket);
+ if (ret < 0)
+ goto error_1;
+
+ socket->sk->sk_allocation = GFP_NOFS;
+
+ /* bind the callback manager's address to make this a server socket */
+ memset(&srx, 0, sizeof(srx));
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = RX_PERF_SERVICE;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin6);
+ srx.transport.sin6.sin6_family = AF_INET6;
+ srx.transport.sin6.sin6_port = htons(RXPERF_PORT);
+
+ ret = rxrpc_sock_set_min_security_level(socket->sk,
+ RXRPC_SECURITY_ENCRYPT);
+ if (ret < 0)
+ goto error_2;
+
+ ret = rxrpc_sock_set_security_keyring(socket->sk, rxperf_sec_keyring);
+
+ ret = kernel_bind(socket, (struct sockaddr *)&srx, sizeof(srx));
+ if (ret < 0)
+ goto error_2;
+
+ rxrpc_kernel_new_call_notification(socket, rxperf_rx_new_call,
+ rxperf_rx_discard_new_call);
+
+ ret = kernel_listen(socket, INT_MAX);
+ if (ret < 0)
+ goto error_2;
+
+ rxperf_socket = socket;
+ rxperf_charge_preallocation(&rxperf_charge_preallocation_work);
+ return 0;
+
+error_2:
+ sock_release(socket);
+error_1:
+ pr_err("Can't set up rxperf socket: %d\n", ret);
+ return ret;
+}
+
+/*
+ * close the rxrpc socket rxperf was using
+ */
+static void rxperf_close_socket(void)
+{
+ kernel_listen(rxperf_socket, 0);
+ kernel_sock_shutdown(rxperf_socket, SHUT_RDWR);
+ flush_workqueue(rxperf_workqueue);
+ sock_release(rxperf_socket);
+}
+
+/*
+ * Log remote abort codes that indicate that we have a protocol disagreement
+ * with the server.
+ */
+static void rxperf_log_error(struct rxperf_call *call, s32 remote_abort)
+{
+ static int max = 0;
+ const char *msg;
+ int m;
+
+ switch (remote_abort) {
+ case RX_EOF: msg = "unexpected EOF"; break;
+ case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;
+ case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;
+ case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;
+ case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;
+ case RXGEN_DECODE: msg = "opcode decode"; break;
+ case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;
+ case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;
+ case -32: msg = "insufficient data"; break;
+ default:
+ return;
+ }
+
+ m = max;
+ if (m < 3) {
+ max = m + 1;
+ pr_info("Peer reported %s failure on %s\n", msg, call->type);
+ }
+}
+
+/*
+ * deliver messages to a call
+ */
+static void rxperf_deliver_to_call(struct work_struct *work)
+{
+ struct rxperf_call *call = container_of(work, struct rxperf_call, work);
+ enum rxperf_call_state state;
+ u32 abort_code, remote_abort = 0;
+ int ret;
+
+ if (call->state == RXPERF_CALL_COMPLETE)
+ return;
+
+ while (state = call->state,
+ state == RXPERF_CALL_SV_AWAIT_PARAMS ||
+ state == RXPERF_CALL_SV_AWAIT_REQUEST ||
+ state == RXPERF_CALL_SV_AWAIT_ACK
+ ) {
+ if (state == RXPERF_CALL_SV_AWAIT_ACK) {
+ if (!rxrpc_kernel_check_life(rxperf_socket, call->rxcall))
+ goto call_complete;
+ return;
+ }
+
+ ret = call->deliver(call);
+ if (ret == 0)
+ ret = rxperf_process_call(call);
+
+ switch (ret) {
+ case 0:
+ continue;
+ case -EINPROGRESS:
+ case -EAGAIN:
+ return;
+ case -ECONNABORTED:
+ rxperf_log_error(call, call->abort_code);
+ goto call_complete;
+ case -EOPNOTSUPP:
+ abort_code = RXGEN_OPCODE;
+ rxrpc_kernel_abort_call(rxperf_socket, call->rxcall,
+ abort_code, ret, "GOP");
+ goto call_complete;
+ case -ENOTSUPP:
+ abort_code = RX_USER_ABORT;
+ rxrpc_kernel_abort_call(rxperf_socket, call->rxcall,
+ abort_code, ret, "GUA");
+ goto call_complete;
+ case -EIO:
+ pr_err("Call %u in bad state %u\n",
+ call->debug_id, call->state);
+ fallthrough;
+ case -ENODATA:
+ case -EBADMSG:
+ case -EMSGSIZE:
+ case -ENOMEM:
+ case -EFAULT:
+ rxrpc_kernel_abort_call(rxperf_socket, call->rxcall,
+ RXGEN_SS_UNMARSHAL, ret, "GUM");
+ goto call_complete;
+ default:
+ rxrpc_kernel_abort_call(rxperf_socket, call->rxcall,
+ RX_CALL_DEAD, ret, "GER");
+ goto call_complete;
+ }
+ }
+
+call_complete:
+ rxperf_set_call_complete(call, ret, remote_abort);
+ /* The call may have been requeued */
+ rxrpc_kernel_end_call(rxperf_socket, call->rxcall);
+ cancel_work(&call->work);
+ kfree(call);
+}
+
+/*
+ * Extract a piece of data from the received data socket buffers.
+ */
+static int rxperf_extract_data(struct rxperf_call *call, bool want_more)
+{
+ u32 remote_abort = 0;
+ int ret;
+
+ ret = rxrpc_kernel_recv_data(rxperf_socket, call->rxcall, &call->iter,
+ &call->iov_len, want_more, &remote_abort,
+ &call->service_id);
+ pr_debug("Extract i=%zu l=%zu m=%u ret=%d\n",
+ iov_iter_count(&call->iter), call->iov_len, want_more, ret);
+ if (ret == 0 || ret == -EAGAIN)
+ return ret;
+
+ if (ret == 1) {
+ switch (call->state) {
+ case RXPERF_CALL_SV_AWAIT_REQUEST:
+ rxperf_set_call_state(call, RXPERF_CALL_SV_REPLYING);
+ break;
+ case RXPERF_CALL_COMPLETE:
+ pr_debug("premature completion %d", call->error);
+ return call->error;
+ default:
+ break;
+ }
+ return 0;
+ }
+
+ rxperf_set_call_complete(call, ret, remote_abort);
+ return ret;
+}
+
+/*
+ * Grab the operation ID from an incoming manager call.
+ */
+static int rxperf_deliver_param_block(struct rxperf_call *call)
+{
+ u32 version;
+ int ret;
+
+ /* Extract the parameter block */
+ ret = rxperf_extract_data(call, true);
+ if (ret < 0)
+ return ret;
+
+ version = ntohl(call->params.version);
+ call->operation_id = ntohl(call->params.type);
+ call->deliver = rxperf_deliver_request;
+
+ if (version != RX_PERF_VERSION) {
+ pr_info("Version mismatch %x\n", version);
+ return -ENOTSUPP;
+ }
+
+ switch (call->operation_id) {
+ case RX_PERF_SEND:
+ call->type = "send";
+ call->reply_len = 0;
+ call->iov_len = 4; /* Expect req size */
+ break;
+ case RX_PERF_RECV:
+ call->type = "recv";
+ call->req_len = 0;
+ call->iov_len = 4; /* Expect reply size */
+ break;
+ case RX_PERF_RPC:
+ call->type = "rpc";
+ call->iov_len = 8; /* Expect req size and reply size */
+ break;
+ case RX_PERF_FILE:
+ call->type = "file";
+ fallthrough;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ rxperf_set_call_state(call, RXPERF_CALL_SV_AWAIT_REQUEST);
+ return call->deliver(call);
+}
+
+/*
+ * Deliver the request data.
+ */
+static int rxperf_deliver_request(struct rxperf_call *call)
+{
+ int ret;
+
+ switch (call->unmarshal) {
+ case 0:
+ call->kvec[0].iov_len = call->iov_len;
+ call->kvec[0].iov_base = call->tmp;
+ iov_iter_kvec(&call->iter, READ, call->kvec, 1, call->iov_len);
+ call->unmarshal++;
+ fallthrough;
+ case 1:
+ ret = rxperf_extract_data(call, true);
+ if (ret < 0)
+ return ret;
+
+ switch (call->operation_id) {
+ case RX_PERF_SEND:
+ call->type = "send";
+ call->req_len = ntohl(call->tmp[0]);
+ call->reply_len = 0;
+ break;
+ case RX_PERF_RECV:
+ call->type = "recv";
+ call->req_len = 0;
+ call->reply_len = ntohl(call->tmp[0]);
+ break;
+ case RX_PERF_RPC:
+ call->type = "rpc";
+ call->req_len = ntohl(call->tmp[0]);
+ call->reply_len = ntohl(call->tmp[1]);
+ break;
+ default:
+ pr_info("Can't parse extra params\n");
+ return -EIO;
+ }
+
+ pr_debug("CALL op=%s rq=%zx rp=%zx\n",
+ call->type, call->req_len, call->reply_len);
+
+ call->iov_len = call->req_len;
+ iov_iter_discard(&call->iter, READ, call->req_len);
+ call->unmarshal++;
+ fallthrough;
+ case 2:
+ ret = rxperf_extract_data(call, false);
+ if (ret < 0)
+ return ret;
+ call->unmarshal++;
+ fallthrough;
+ default:
+ return 0;
+ }
+}
+
+/*
+ * Process a call for which we've received the request.
+ */
+static int rxperf_process_call(struct rxperf_call *call)
+{
+ struct msghdr msg = {};
+ struct bio_vec bv[1];
+ struct kvec iov[1];
+ ssize_t n;
+ size_t reply_len = call->reply_len, len;
+
+ rxrpc_kernel_set_tx_length(rxperf_socket, call->rxcall,
+ reply_len + sizeof(rxperf_magic_cookie));
+
+ while (reply_len > 0) {
+ len = min(reply_len, PAGE_SIZE);
+ bv[0].bv_page = ZERO_PAGE(0);
+ bv[0].bv_offset = 0;
+ bv[0].bv_len = len;
+ iov_iter_bvec(&msg.msg_iter, WRITE, bv, 1, len);
+ msg.msg_flags = MSG_MORE;
+ n = rxrpc_kernel_send_data(rxperf_socket, call->rxcall, &msg,
+ len, rxperf_notify_end_reply_tx);
+ if (n < 0)
+ return n;
+ if (n == 0)
+ return -EIO;
+ reply_len -= n;
+ }
+
+ len = sizeof(rxperf_magic_cookie);
+ iov[0].iov_base = (void *)rxperf_magic_cookie;
+ iov[0].iov_len = len;
+ iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
+ msg.msg_flags = 0;
+ n = rxrpc_kernel_send_data(rxperf_socket, call->rxcall, &msg, len,
+ rxperf_notify_end_reply_tx);
+ if (n >= 0)
+ return 0; /* Success */
+
+ if (n == -ENOMEM)
+ rxrpc_kernel_abort_call(rxperf_socket, call->rxcall,
+ RXGEN_SS_MARSHAL, -ENOMEM, "GOM");
+ return n;
+}
+
+/*
+ * Add a key to the security keyring.
+ */
+static int rxperf_add_key(struct key *keyring)
+{
+ key_ref_t kref;
+ int ret;
+
+ kref = key_create_or_update(make_key_ref(keyring, true),
+ "rxrpc_s",
+ __stringify(RX_PERF_SERVICE) ":2",
+ secret,
+ sizeof(secret),
+ KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH
+ | KEY_USR_VIEW,
+ KEY_ALLOC_NOT_IN_QUOTA);
+
+ if (IS_ERR(kref)) {
+ pr_err("Can't allocate rxperf server key: %ld\n", PTR_ERR(kref));
+ return PTR_ERR(kref);
+ }
+
+ ret = key_link(keyring, key_ref_to_ptr(kref));
+ if (ret < 0)
+ pr_err("Can't link rxperf server key: %d\n", ret);
+ key_ref_put(kref);
+ return ret;
+}
+
+/*
+ * Initialise the rxperf server.
+ */
+static int __init rxperf_init(void)
+{
+ struct key *keyring;
+ int ret = -ENOMEM;
+
+ pr_info("Server registering\n");
+
+ rxperf_workqueue = alloc_workqueue("rxperf", 0, 0);
+ if (!rxperf_workqueue)
+ goto error_workqueue;
+
+ keyring = keyring_alloc("rxperf_server",
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, current_cred(),
+ KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
+ KEY_POS_WRITE |
+ KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH |
+ KEY_USR_WRITE |
+ KEY_OTH_VIEW | KEY_OTH_READ | KEY_OTH_SEARCH,
+ KEY_ALLOC_NOT_IN_QUOTA,
+ NULL, NULL);
+ if (IS_ERR(keyring)) {
+ pr_err("Can't allocate rxperf server keyring: %ld\n",
+ PTR_ERR(keyring));
+ goto error_keyring;
+ }
+ rxperf_sec_keyring = keyring;
+ ret = rxperf_add_key(keyring);
+ if (ret < 0)
+ goto error_key;
+
+ ret = rxperf_open_socket();
+ if (ret < 0)
+ goto error_socket;
+ return 0;
+
+error_socket:
+error_key:
+ key_put(rxperf_sec_keyring);
+error_keyring:
+ destroy_workqueue(rxperf_workqueue);
+ rcu_barrier();
+error_workqueue:
+ pr_err("Failed to register: %d\n", ret);
+ return ret;
+}
+late_initcall(rxperf_init); /* Must be called after net/ to create socket */
+
+static void __exit rxperf_exit(void)
+{
+ pr_info("Server unregistering.\n");
+
+ rxperf_close_socket();
+ key_put(rxperf_sec_keyring);
+ destroy_workqueue(rxperf_workqueue);
+ rcu_barrier();
+}
+module_exit(rxperf_exit);
+
diff --git a/net/rxrpc/server_key.c b/net/rxrpc/server_key.c
index ee269e0e6ee8..e51940589ee5 100644
--- a/net/rxrpc/server_key.c
+++ b/net/rxrpc/server_key.c
@@ -144,3 +144,28 @@ int rxrpc_server_keyring(struct rxrpc_sock *rx, sockptr_t optval, int optlen)
_leave(" = 0 [key %x]", key->serial);
return 0;
}
+
+/**
+ * rxrpc_sock_set_security_keyring - Set the security keyring for a kernel service
+ * @sk: The socket to set the keyring on
+ * @keyring: The keyring to set
+ *
+ * Set the server security keyring on an rxrpc socket. This is used to provide
+ * the encryption keys for a kernel service.
+ */
+int rxrpc_sock_set_security_keyring(struct sock *sk, struct key *keyring)
+{
+ struct rxrpc_sock *rx = rxrpc_sk(sk);
+ int ret = 0;
+
+ lock_sock(sk);
+ if (rx->securities)
+ ret = -EINVAL;
+ else if (rx->sk.sk_state != RXRPC_UNBOUND)
+ ret = -EISCONN;
+ else
+ rx->securities = key_get(keyring);
+ release_sock(sk);
+ return ret;
+}
+EXPORT_SYMBOL(rxrpc_sock_set_security_keyring);