From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/qrtr/ns.c | 828 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 828 insertions(+) create mode 100644 net/qrtr/ns.c (limited to 'net/qrtr/ns.c') diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c new file mode 100644 index 000000000..722936f7d --- /dev/null +++ b/net/qrtr/ns.c @@ -0,0 +1,828 @@ +// 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 +#include +#include +#include + +#include "qrtr.h" + +#include +#define CREATE_TRACE_POINTS +#include + +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) +{ + 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) + 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); + 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 */ + node = node_get(node_id); + if (node) + server_del(node, port); + + /* 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; + } + + 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; + } + + /* 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; + + return server_del(node, port); +} + +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) +{ + trace_sk_data_ready(sk); + + queue_work(qrtr_ns.workqueue, &qrtr_ns.work); +} + +int 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; + + 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 0; + +err_wq: + destroy_workqueue(qrtr_ns.workqueue); +err_sock: + sock_release(qrtr_ns.sock); + return ret; +} +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 "); +MODULE_DESCRIPTION("Qualcomm IPC Router Nameservice"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.2.3