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(). ... --- fs/nsfs.c | 306 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 306 insertions(+) create mode 100644 fs/nsfs.c (limited to 'fs/nsfs.c') diff --git a/fs/nsfs.c b/fs/nsfs.c new file mode 100644 index 000000000..3506f6074 --- /dev/null +++ b/fs/nsfs.c @@ -0,0 +1,306 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static struct vfsmount *nsfs_mnt; + +static long ns_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg); +static const struct file_operations ns_file_operations = { + .llseek = no_llseek, + .unlocked_ioctl = ns_ioctl, +}; + +static char *ns_dname(struct dentry *dentry, char *buffer, int buflen) +{ + struct inode *inode = d_inode(dentry); + const struct proc_ns_operations *ns_ops = dentry->d_fsdata; + + return dynamic_dname(buffer, buflen, "%s:[%lu]", + ns_ops->name, inode->i_ino); +} + +static void ns_prune_dentry(struct dentry *dentry) +{ + struct inode *inode = d_inode(dentry); + if (inode) { + struct ns_common *ns = inode->i_private; + atomic_long_set(&ns->stashed, 0); + } +} + +const struct dentry_operations ns_dentry_operations = +{ + .d_prune = ns_prune_dentry, + .d_delete = always_delete_dentry, + .d_dname = ns_dname, +}; + +static void nsfs_evict(struct inode *inode) +{ + struct ns_common *ns = inode->i_private; + clear_inode(inode); + ns->ops->put(ns); +} + +static int __ns_get_path(struct path *path, struct ns_common *ns) +{ + struct vfsmount *mnt = nsfs_mnt; + struct dentry *dentry; + struct inode *inode; + unsigned long d; + + rcu_read_lock(); + d = atomic_long_read(&ns->stashed); + if (!d) + goto slow; + dentry = (struct dentry *)d; + if (!lockref_get_not_dead(&dentry->d_lockref)) + goto slow; + rcu_read_unlock(); + ns->ops->put(ns); +got_it: + path->mnt = mntget(mnt); + path->dentry = dentry; + return 0; +slow: + rcu_read_unlock(); + inode = new_inode_pseudo(mnt->mnt_sb); + if (!inode) { + ns->ops->put(ns); + return -ENOMEM; + } + inode->i_ino = ns->inum; + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); + inode->i_flags |= S_IMMUTABLE; + inode->i_mode = S_IFREG | S_IRUGO; + inode->i_fop = &ns_file_operations; + inode->i_private = ns; + + dentry = d_alloc_anon(mnt->mnt_sb); + if (!dentry) { + iput(inode); + return -ENOMEM; + } + d_instantiate(dentry, inode); + dentry->d_fsdata = (void *)ns->ops; + d = atomic_long_cmpxchg(&ns->stashed, 0, (unsigned long)dentry); + if (d) { + d_delete(dentry); /* make sure ->d_prune() does nothing */ + dput(dentry); + cpu_relax(); + return -EAGAIN; + } + goto got_it; +} + +int ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb, + void *private_data) +{ + int ret; + + do { + struct ns_common *ns = ns_get_cb(private_data); + if (!ns) + return -ENOENT; + ret = __ns_get_path(path, ns); + } while (ret == -EAGAIN); + + return ret; +} + +struct ns_get_path_task_args { + const struct proc_ns_operations *ns_ops; + struct task_struct *task; +}; + +static struct ns_common *ns_get_path_task(void *private_data) +{ + struct ns_get_path_task_args *args = private_data; + + return args->ns_ops->get(args->task); +} + +int ns_get_path(struct path *path, struct task_struct *task, + const struct proc_ns_operations *ns_ops) +{ + struct ns_get_path_task_args args = { + .ns_ops = ns_ops, + .task = task, + }; + + return ns_get_path_cb(path, ns_get_path_task, &args); +} + +int open_related_ns(struct ns_common *ns, + struct ns_common *(*get_ns)(struct ns_common *ns)) +{ + struct path path = {}; + struct file *f; + int err; + int fd; + + fd = get_unused_fd_flags(O_CLOEXEC); + if (fd < 0) + return fd; + + do { + struct ns_common *relative; + + relative = get_ns(ns); + if (IS_ERR(relative)) { + put_unused_fd(fd); + return PTR_ERR(relative); + } + + err = __ns_get_path(&path, relative); + } while (err == -EAGAIN); + + if (err) { + put_unused_fd(fd); + return err; + } + + f = dentry_open(&path, O_RDONLY, current_cred()); + path_put(&path); + if (IS_ERR(f)) { + put_unused_fd(fd); + fd = PTR_ERR(f); + } else + fd_install(fd, f); + + return fd; +} +EXPORT_SYMBOL_GPL(open_related_ns); + +static long ns_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + struct user_namespace *user_ns; + struct ns_common *ns = get_proc_ns(file_inode(filp)); + uid_t __user *argp; + uid_t uid; + + switch (ioctl) { + case NS_GET_USERNS: + return open_related_ns(ns, ns_get_owner); + case NS_GET_PARENT: + if (!ns->ops->get_parent) + return -EINVAL; + return open_related_ns(ns, ns->ops->get_parent); + case NS_GET_NSTYPE: + return ns->ops->type; + case NS_GET_OWNER_UID: + if (ns->ops->type != CLONE_NEWUSER) + return -EINVAL; + user_ns = container_of(ns, struct user_namespace, ns); + argp = (uid_t __user *) arg; + uid = from_kuid_munged(current_user_ns(), user_ns->owner); + return put_user(uid, argp); + default: + return -ENOTTY; + } +} + +int ns_get_name(char *buf, size_t size, struct task_struct *task, + const struct proc_ns_operations *ns_ops) +{ + struct ns_common *ns; + int res = -ENOENT; + const char *name; + ns = ns_ops->get(task); + if (ns) { + name = ns_ops->real_ns_name ? : ns_ops->name; + res = snprintf(buf, size, "%s:[%u]", name, ns->inum); + ns_ops->put(ns); + } + return res; +} + +bool proc_ns_file(const struct file *file) +{ + return file->f_op == &ns_file_operations; +} + +struct file *proc_ns_fget(int fd) +{ + struct file *file; + + file = fget(fd); + if (!file) + return ERR_PTR(-EBADF); + + if (file->f_op != &ns_file_operations) + goto out_invalid; + + return file; + +out_invalid: + fput(file); + return ERR_PTR(-EINVAL); +} + +/** + * ns_match() - Returns true if current namespace matches dev/ino provided. + * @ns_common: current ns + * @dev: dev_t from nsfs that will be matched against current nsfs + * @ino: ino_t from nsfs that will be matched against current nsfs + * + * Return: true if dev and ino matches the current nsfs. + */ +bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino) +{ + return (ns->inum == ino) && (nsfs_mnt->mnt_sb->s_dev == dev); +} + + +static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry) +{ + struct inode *inode = d_inode(dentry); + const struct proc_ns_operations *ns_ops = dentry->d_fsdata; + + seq_printf(seq, "%s:[%lu]", ns_ops->name, inode->i_ino); + return 0; +} + +static const struct super_operations nsfs_ops = { + .statfs = simple_statfs, + .evict_inode = nsfs_evict, + .show_path = nsfs_show_path, +}; + +static int nsfs_init_fs_context(struct fs_context *fc) +{ + struct pseudo_fs_context *ctx = init_pseudo(fc, NSFS_MAGIC); + if (!ctx) + return -ENOMEM; + ctx->ops = &nsfs_ops; + ctx->dops = &ns_dentry_operations; + return 0; +} + +static struct file_system_type nsfs = { + .name = "nsfs", + .init_fs_context = nsfs_init_fs_context, + .kill_sb = kill_anon_super, +}; + +void __init nsfs_init(void) +{ + nsfs_mnt = kern_mount(&nsfs); + if (IS_ERR(nsfs_mnt)) + panic("can't set nsfs up\n"); + nsfs_mnt->mnt_sb->s_flags &= ~SB_NOUSER; +} -- cgit v1.2.3