diff options
Diffstat (limited to 'net/qrtr/ns.c')
| -rw-r--r-- | net/qrtr/ns.c | 837 |
1 files changed, 837 insertions, 0 deletions
diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c new file mode 100644 index 000000000..c92dd960b --- /dev/null +++ b/net/qrtr/ns.c @@ -0,0 +1,837 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Copyright (c) 2015, Sony Mobile Communications Inc. + * Copyright (c) 2013, The Linux Foundation. All rights reserved. + * Copyright (c) 2020, Linaro Ltd. + */ + +#include <linux/module.h> +#include <linux/qrtr.h> +#include <linux/workqueue.h> +#include <net/sock.h> + +#include "qrtr.h" + +#define CREATE_TRACE_POINTS +#include <trace/events/qrtr.h> + +static RADIX_TREE(nodes, GFP_KERNEL); + +static struct { + struct socket *sock; + struct sockaddr_qrtr bcast_sq; + struct list_head lookups; + struct workqueue_struct *workqueue; + struct work_struct work; + int local_node; +} qrtr_ns; + +static const char * const qrtr_ctrl_pkt_strings[] = { + [QRTR_TYPE_HELLO] = "hello", + [QRTR_TYPE_BYE] = "bye", + [QRTR_TYPE_NEW_SERVER] = "new-server", + [QRTR_TYPE_DEL_SERVER] = "del-server", + [QRTR_TYPE_DEL_CLIENT] = "del-client", + [QRTR_TYPE_RESUME_TX] = "resume-tx", + [QRTR_TYPE_EXIT] = "exit", + [QRTR_TYPE_PING] = "ping", + [QRTR_TYPE_NEW_LOOKUP] = "new-lookup", + [QRTR_TYPE_DEL_LOOKUP] = "del-lookup", +}; + +struct qrtr_server_filter { + unsigned int service; + unsigned int instance; + unsigned int ifilter; +}; + +struct qrtr_lookup { + unsigned int service; + unsigned int instance; + + struct sockaddr_qrtr sq; + struct list_head li; +}; + +struct qrtr_server { + unsigned int service; + unsigned int instance; + + unsigned int node; + unsigned int port; + + struct list_head qli; +}; + +struct qrtr_node { + unsigned int id; + struct radix_tree_root servers; +}; + +static struct qrtr_node *node_get(unsigned int node_id) +{ + struct qrtr_node *node; + + node = radix_tree_lookup(&nodes, node_id); + if (node) + return node; + + /* If node didn't exist, allocate and insert it to the tree */ + node = kzalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return NULL; + + node->id = node_id; + + if (radix_tree_insert(&nodes, node_id, node)) { + kfree(node); + return NULL; + } + + return node; +} + +static int server_match(const struct qrtr_server *srv, + const struct qrtr_server_filter *f) +{ + unsigned int ifilter = f->ifilter; + + if (f->service != 0 && srv->service != f->service) + return 0; + if (!ifilter && f->instance) + ifilter = ~0; + + return (srv->instance & ifilter) == f->instance; +} + +static int service_announce_new(struct sockaddr_qrtr *dest, + struct qrtr_server *srv) +{ + struct qrtr_ctrl_pkt pkt; + struct msghdr msg = { }; + struct kvec iv; + + trace_qrtr_ns_service_announce_new(srv->service, srv->instance, + srv->node, srv->port); + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER); + pkt.server.service = cpu_to_le32(srv->service); + pkt.server.instance = cpu_to_le32(srv->instance); + pkt.server.node = cpu_to_le32(srv->node); + pkt.server.port = cpu_to_le32(srv->port); + + msg.msg_name = (struct sockaddr *)dest; + msg.msg_namelen = sizeof(*dest); + + return kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); +} + +static int service_announce_del(struct sockaddr_qrtr *dest, + struct qrtr_server *srv) +{ + struct qrtr_ctrl_pkt pkt; + struct msghdr msg = { }; + struct kvec iv; + int ret; + + trace_qrtr_ns_service_announce_del(srv->service, srv->instance, + srv->node, srv->port); + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_SERVER); + pkt.server.service = cpu_to_le32(srv->service); + pkt.server.instance = cpu_to_le32(srv->instance); + pkt.server.node = cpu_to_le32(srv->node); + pkt.server.port = cpu_to_le32(srv->port); + + msg.msg_name = (struct sockaddr *)dest; + msg.msg_namelen = sizeof(*dest); + + ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); + if (ret < 0) + pr_err("failed to announce del service\n"); + + return ret; +} + +static void lookup_notify(struct sockaddr_qrtr *to, struct qrtr_server *srv, + bool new) +{ + struct qrtr_ctrl_pkt pkt; + struct msghdr msg = { }; + struct kvec iv; + int ret; + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = new ? cpu_to_le32(QRTR_TYPE_NEW_SERVER) : + cpu_to_le32(QRTR_TYPE_DEL_SERVER); + if (srv) { + pkt.server.service = cpu_to_le32(srv->service); + pkt.server.instance = cpu_to_le32(srv->instance); + pkt.server.node = cpu_to_le32(srv->node); + pkt.server.port = cpu_to_le32(srv->port); + } + + msg.msg_name = (struct sockaddr *)to; + msg.msg_namelen = sizeof(*to); + + ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); + if (ret < 0) + pr_err("failed to send lookup notification\n"); +} + +static int announce_servers(struct sockaddr_qrtr *sq) +{ + struct radix_tree_iter iter; + struct qrtr_server *srv; + struct qrtr_node *node; + void __rcu **slot; + int ret; + + node = node_get(qrtr_ns.local_node); + if (!node) + return 0; + + rcu_read_lock(); + /* Announce the list of servers registered in this node */ + radix_tree_for_each_slot(slot, &node->servers, &iter, 0) { + srv = radix_tree_deref_slot(slot); + if (!srv) + continue; + if (radix_tree_deref_retry(srv)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + slot = radix_tree_iter_resume(slot, &iter); + rcu_read_unlock(); + + ret = service_announce_new(sq, srv); + if (ret < 0) { + pr_err("failed to announce new service\n"); + return ret; + } + + rcu_read_lock(); + } + + rcu_read_unlock(); + + return 0; +} + +static struct qrtr_server *server_add(unsigned int service, + unsigned int instance, + unsigned int node_id, + unsigned int port) +{ + struct qrtr_server *srv; + struct qrtr_server *old; + struct qrtr_node *node; + + if (!service || !port) + return NULL; + + srv = kzalloc(sizeof(*srv), GFP_KERNEL); + if (!srv) + return NULL; + + srv->service = service; + srv->instance = instance; + srv->node = node_id; + srv->port = port; + + node = node_get(node_id); + if (!node) + goto err; + + /* Delete the old server on the same port */ + old = radix_tree_lookup(&node->servers, port); + if (old) { + radix_tree_delete(&node->servers, port); + kfree(old); + } + + radix_tree_insert(&node->servers, port, srv); + + trace_qrtr_ns_server_add(srv->service, srv->instance, + srv->node, srv->port); + + return srv; + +err: + kfree(srv); + return NULL; +} + +static int server_del(struct qrtr_node *node, unsigned int port, bool bcast) +{ + struct qrtr_lookup *lookup; + struct qrtr_server *srv; + struct list_head *li; + + srv = radix_tree_lookup(&node->servers, port); + if (!srv) + return -ENOENT; + + radix_tree_delete(&node->servers, port); + + /* Broadcast the removal of local servers */ + if (srv->node == qrtr_ns.local_node && bcast) + service_announce_del(&qrtr_ns.bcast_sq, srv); + + /* Announce the service's disappearance to observers */ + list_for_each(li, &qrtr_ns.lookups) { + lookup = container_of(li, struct qrtr_lookup, li); + if (lookup->service && lookup->service != srv->service) + continue; + if (lookup->instance && lookup->instance != srv->instance) + continue; + + lookup_notify(&lookup->sq, srv, false); + } + + kfree(srv); + + return 0; +} + +static int say_hello(struct sockaddr_qrtr *dest) +{ + struct qrtr_ctrl_pkt pkt; + struct msghdr msg = { }; + struct kvec iv; + int ret; + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = cpu_to_le32(QRTR_TYPE_HELLO); + + msg.msg_name = (struct sockaddr *)dest; + msg.msg_namelen = sizeof(*dest); + + ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); + if (ret < 0) + pr_err("failed to send hello msg\n"); + + return ret; +} + +/* Announce the list of servers registered on the local node */ +static int ctrl_cmd_hello(struct sockaddr_qrtr *sq) +{ + int ret; + + ret = say_hello(sq); + if (ret < 0) + return ret; + + return announce_servers(sq); +} + +static int ctrl_cmd_bye(struct sockaddr_qrtr *from) +{ + struct qrtr_node *local_node; + struct radix_tree_iter iter; + struct qrtr_ctrl_pkt pkt; + struct qrtr_server *srv; + struct sockaddr_qrtr sq; + struct msghdr msg = { }; + struct qrtr_node *node; + void __rcu **slot; + struct kvec iv; + int ret; + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + node = node_get(from->sq_node); + if (!node) + return 0; + + rcu_read_lock(); + /* Advertise removal of this client to all servers of remote node */ + radix_tree_for_each_slot(slot, &node->servers, &iter, 0) { + srv = radix_tree_deref_slot(slot); + if (!srv) + continue; + if (radix_tree_deref_retry(srv)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + slot = radix_tree_iter_resume(slot, &iter); + rcu_read_unlock(); + server_del(node, srv->port, true); + rcu_read_lock(); + } + rcu_read_unlock(); + + /* Advertise the removal of this client to all local servers */ + local_node = node_get(qrtr_ns.local_node); + if (!local_node) + return 0; + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = cpu_to_le32(QRTR_TYPE_BYE); + pkt.client.node = cpu_to_le32(from->sq_node); + + rcu_read_lock(); + radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) { + srv = radix_tree_deref_slot(slot); + if (!srv) + continue; + if (radix_tree_deref_retry(srv)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + slot = radix_tree_iter_resume(slot, &iter); + rcu_read_unlock(); + + sq.sq_family = AF_QIPCRTR; + sq.sq_node = srv->node; + sq.sq_port = srv->port; + + msg.msg_name = (struct sockaddr *)&sq; + msg.msg_namelen = sizeof(sq); + + ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); + if (ret < 0) { + pr_err("failed to send bye cmd\n"); + return ret; + } + rcu_read_lock(); + } + + rcu_read_unlock(); + + return 0; +} + +static int ctrl_cmd_del_client(struct sockaddr_qrtr *from, + unsigned int node_id, unsigned int port) +{ + struct qrtr_node *local_node; + struct radix_tree_iter iter; + struct qrtr_lookup *lookup; + struct qrtr_ctrl_pkt pkt; + struct msghdr msg = { }; + struct qrtr_server *srv; + struct sockaddr_qrtr sq; + struct qrtr_node *node; + struct list_head *tmp; + struct list_head *li; + void __rcu **slot; + struct kvec iv; + int ret; + + iv.iov_base = &pkt; + iv.iov_len = sizeof(pkt); + + /* Don't accept spoofed messages */ + if (from->sq_node != node_id) + return -EINVAL; + + /* Local DEL_CLIENT messages comes from the port being closed */ + if (from->sq_node == qrtr_ns.local_node && from->sq_port != port) + return -EINVAL; + + /* Remove any lookups by this client */ + list_for_each_safe(li, tmp, &qrtr_ns.lookups) { + lookup = container_of(li, struct qrtr_lookup, li); + if (lookup->sq.sq_node != node_id) + continue; + if (lookup->sq.sq_port != port) + continue; + + list_del(&lookup->li); + kfree(lookup); + } + + /* Remove the server belonging to this port but don't broadcast + * DEL_SERVER. Neighbours would've already removed the server belonging + * to this port due to the DEL_CLIENT broadcast from qrtr_port_remove(). + */ + node = node_get(node_id); + if (node) + server_del(node, port, false); + + /* Advertise the removal of this client to all local servers */ + local_node = node_get(qrtr_ns.local_node); + if (!local_node) + return 0; + + memset(&pkt, 0, sizeof(pkt)); + pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); + pkt.client.node = cpu_to_le32(node_id); + pkt.client.port = cpu_to_le32(port); + + rcu_read_lock(); + radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) { + srv = radix_tree_deref_slot(slot); + if (!srv) + continue; + if (radix_tree_deref_retry(srv)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + slot = radix_tree_iter_resume(slot, &iter); + rcu_read_unlock(); + + sq.sq_family = AF_QIPCRTR; + sq.sq_node = srv->node; + sq.sq_port = srv->port; + + msg.msg_name = (struct sockaddr *)&sq; + msg.msg_namelen = sizeof(sq); + + ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt)); + if (ret < 0) { + pr_err("failed to send del client cmd\n"); + return ret; + } + rcu_read_lock(); + } + + rcu_read_unlock(); + + return 0; +} + +static int ctrl_cmd_new_server(struct sockaddr_qrtr *from, + unsigned int service, unsigned int instance, + unsigned int node_id, unsigned int port) +{ + struct qrtr_lookup *lookup; + struct qrtr_server *srv; + struct list_head *li; + int ret = 0; + + /* Ignore specified node and port for local servers */ + if (from->sq_node == qrtr_ns.local_node) { + node_id = from->sq_node; + port = from->sq_port; + } + + /* Don't accept spoofed messages */ + if (from->sq_node != node_id) + return -EINVAL; + + srv = server_add(service, instance, node_id, port); + if (!srv) + return -EINVAL; + + if (srv->node == qrtr_ns.local_node) { + ret = service_announce_new(&qrtr_ns.bcast_sq, srv); + if (ret < 0) { + pr_err("failed to announce new service\n"); + return ret; + } + } + + /* Notify any potential lookups about the new server */ + list_for_each(li, &qrtr_ns.lookups) { + lookup = container_of(li, struct qrtr_lookup, li); + if (lookup->service && lookup->service != service) + continue; + if (lookup->instance && lookup->instance != instance) + continue; + + lookup_notify(&lookup->sq, srv, true); + } + + return ret; +} + +static int ctrl_cmd_del_server(struct sockaddr_qrtr *from, + unsigned int service, unsigned int instance, + unsigned int node_id, unsigned int port) +{ + struct qrtr_node *node; + + /* Ignore specified node and port for local servers*/ + if (from->sq_node == qrtr_ns.local_node) { + node_id = from->sq_node; + port = from->sq_port; + } + + /* Don't accept spoofed messages */ + if (from->sq_node != node_id) + return -EINVAL; + + /* Local servers may only unregister themselves */ + if (from->sq_node == qrtr_ns.local_node && from->sq_port != port) + return -EINVAL; + + node = node_get(node_id); + if (!node) + return -ENOENT; + + server_del(node, port, true); + + return 0; +} + +static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from, + unsigned int service, unsigned int instance) +{ + struct radix_tree_iter node_iter; + struct qrtr_server_filter filter; + struct radix_tree_iter srv_iter; + struct qrtr_lookup *lookup; + struct qrtr_node *node; + void __rcu **node_slot; + void __rcu **srv_slot; + + /* Accept only local observers */ + if (from->sq_node != qrtr_ns.local_node) + return -EINVAL; + + lookup = kzalloc(sizeof(*lookup), GFP_KERNEL); + if (!lookup) + return -ENOMEM; + + lookup->sq = *from; + lookup->service = service; + lookup->instance = instance; + list_add_tail(&lookup->li, &qrtr_ns.lookups); + + memset(&filter, 0, sizeof(filter)); + filter.service = service; + filter.instance = instance; + + rcu_read_lock(); + radix_tree_for_each_slot(node_slot, &nodes, &node_iter, 0) { + node = radix_tree_deref_slot(node_slot); + if (!node) + continue; + if (radix_tree_deref_retry(node)) { + node_slot = radix_tree_iter_retry(&node_iter); + continue; + } + node_slot = radix_tree_iter_resume(node_slot, &node_iter); + + radix_tree_for_each_slot(srv_slot, &node->servers, + &srv_iter, 0) { + struct qrtr_server *srv; + + srv = radix_tree_deref_slot(srv_slot); + if (!srv) + continue; + if (radix_tree_deref_retry(srv)) { + srv_slot = radix_tree_iter_retry(&srv_iter); + continue; + } + + if (!server_match(srv, &filter)) + continue; + + srv_slot = radix_tree_iter_resume(srv_slot, &srv_iter); + + rcu_read_unlock(); + lookup_notify(from, srv, true); + rcu_read_lock(); + } + } + rcu_read_unlock(); + + /* Empty notification, to indicate end of listing */ + lookup_notify(from, NULL, true); + + return 0; +} + +static void ctrl_cmd_del_lookup(struct sockaddr_qrtr *from, + unsigned int service, unsigned int instance) +{ + struct qrtr_lookup *lookup; + struct list_head *tmp; + struct list_head *li; + + list_for_each_safe(li, tmp, &qrtr_ns.lookups) { + lookup = container_of(li, struct qrtr_lookup, li); + if (lookup->sq.sq_node != from->sq_node) + continue; + if (lookup->sq.sq_port != from->sq_port) + continue; + if (lookup->service != service) + continue; + if (lookup->instance && lookup->instance != instance) + continue; + + list_del(&lookup->li); + kfree(lookup); + } +} + +static void qrtr_ns_worker(struct work_struct *work) +{ + const struct qrtr_ctrl_pkt *pkt; + size_t recv_buf_size = 4096; + struct sockaddr_qrtr sq; + struct msghdr msg = { }; + unsigned int cmd; + ssize_t msglen; + void *recv_buf; + struct kvec iv; + int ret; + + msg.msg_name = (struct sockaddr *)&sq; + msg.msg_namelen = sizeof(sq); + + recv_buf = kzalloc(recv_buf_size, GFP_KERNEL); + if (!recv_buf) + return; + + for (;;) { + iv.iov_base = recv_buf; + iv.iov_len = recv_buf_size; + + msglen = kernel_recvmsg(qrtr_ns.sock, &msg, &iv, 1, + iv.iov_len, MSG_DONTWAIT); + + if (msglen == -EAGAIN) + break; + + if (msglen < 0) { + pr_err("error receiving packet: %zd\n", msglen); + break; + } + + pkt = recv_buf; + cmd = le32_to_cpu(pkt->cmd); + if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) && + qrtr_ctrl_pkt_strings[cmd]) + trace_qrtr_ns_message(qrtr_ctrl_pkt_strings[cmd], + sq.sq_node, sq.sq_port); + + ret = 0; + switch (cmd) { + case QRTR_TYPE_HELLO: + ret = ctrl_cmd_hello(&sq); + break; + case QRTR_TYPE_BYE: + ret = ctrl_cmd_bye(&sq); + break; + case QRTR_TYPE_DEL_CLIENT: + ret = ctrl_cmd_del_client(&sq, + le32_to_cpu(pkt->client.node), + le32_to_cpu(pkt->client.port)); + break; + case QRTR_TYPE_NEW_SERVER: + ret = ctrl_cmd_new_server(&sq, + le32_to_cpu(pkt->server.service), + le32_to_cpu(pkt->server.instance), + le32_to_cpu(pkt->server.node), + le32_to_cpu(pkt->server.port)); + break; + case QRTR_TYPE_DEL_SERVER: + ret = ctrl_cmd_del_server(&sq, + le32_to_cpu(pkt->server.service), + le32_to_cpu(pkt->server.instance), + le32_to_cpu(pkt->server.node), + le32_to_cpu(pkt->server.port)); + break; + case QRTR_TYPE_EXIT: + case QRTR_TYPE_PING: + case QRTR_TYPE_RESUME_TX: + break; + case QRTR_TYPE_NEW_LOOKUP: + ret = ctrl_cmd_new_lookup(&sq, + le32_to_cpu(pkt->server.service), + le32_to_cpu(pkt->server.instance)); + break; + case QRTR_TYPE_DEL_LOOKUP: + ctrl_cmd_del_lookup(&sq, + le32_to_cpu(pkt->server.service), + le32_to_cpu(pkt->server.instance)); + break; + } + + if (ret < 0) + pr_err("failed while handling packet from %d:%d", + sq.sq_node, sq.sq_port); + } + + kfree(recv_buf); +} + +static void qrtr_ns_data_ready(struct sock *sk) +{ + queue_work(qrtr_ns.workqueue, &qrtr_ns.work); +} + +void qrtr_ns_init(void) +{ + struct sockaddr_qrtr sq; + int ret; + + INIT_LIST_HEAD(&qrtr_ns.lookups); + INIT_WORK(&qrtr_ns.work, qrtr_ns_worker); + + ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM, + PF_QIPCRTR, &qrtr_ns.sock); + if (ret < 0) + return; + + ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq); + if (ret < 0) { + pr_err("failed to get socket name\n"); + goto err_sock; + } + + qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1); + if (!qrtr_ns.workqueue) { + ret = -ENOMEM; + goto err_sock; + } + + qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready; + + sq.sq_port = QRTR_PORT_CTRL; + qrtr_ns.local_node = sq.sq_node; + + ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq)); + if (ret < 0) { + pr_err("failed to bind to socket\n"); + goto err_wq; + } + + qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR; + qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST; + qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL; + + ret = say_hello(&qrtr_ns.bcast_sq); + if (ret < 0) + goto err_wq; + + return; + +err_wq: + destroy_workqueue(qrtr_ns.workqueue); +err_sock: + sock_release(qrtr_ns.sock); +} +EXPORT_SYMBOL_GPL(qrtr_ns_init); + +void qrtr_ns_remove(void) +{ + cancel_work_sync(&qrtr_ns.work); + destroy_workqueue(qrtr_ns.workqueue); + sock_release(qrtr_ns.sock); +} +EXPORT_SYMBOL_GPL(qrtr_ns_remove); + +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); +MODULE_DESCRIPTION("Qualcomm IPC Router Nameservice"); +MODULE_LICENSE("Dual BSD/GPL"); |