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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /kernel/time/itimer.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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().
...
Diffstat (limited to '')
-rw-r--r-- | kernel/time/itimer.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c new file mode 100644 index 000000000..00629e658 --- /dev/null +++ b/kernel/time/itimer.c @@ -0,0 +1,403 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 1992 Darren Senn + */ + +/* These are all the functions necessary to implement itimers */ + +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/syscalls.h> +#include <linux/time.h> +#include <linux/sched/signal.h> +#include <linux/sched/cputime.h> +#include <linux/posix-timers.h> +#include <linux/hrtimer.h> +#include <trace/events/timer.h> +#include <linux/compat.h> + +#include <linux/uaccess.h> + +/** + * itimer_get_remtime - get remaining time for the timer + * + * @timer: the timer to read + * + * Returns the delta between the expiry time and now, which can be + * less than zero or 1usec for an pending expired timer + */ +static struct timespec64 itimer_get_remtime(struct hrtimer *timer) +{ + ktime_t rem = __hrtimer_get_remaining(timer, true); + + /* + * Racy but safe: if the itimer expires after the above + * hrtimer_get_remtime() call but before this condition + * then we return 0 - which is correct. + */ + if (hrtimer_active(timer)) { + if (rem <= 0) + rem = NSEC_PER_USEC; + } else + rem = 0; + + return ktime_to_timespec64(rem); +} + +static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id, + struct itimerspec64 *const value) +{ + u64 val, interval; + struct cpu_itimer *it = &tsk->signal->it[clock_id]; + + spin_lock_irq(&tsk->sighand->siglock); + + val = it->expires; + interval = it->incr; + if (val) { + u64 t, samples[CPUCLOCK_MAX]; + + thread_group_sample_cputime(tsk, samples); + t = samples[clock_id]; + + if (val < t) + /* about to fire */ + val = TICK_NSEC; + else + val -= t; + } + + spin_unlock_irq(&tsk->sighand->siglock); + + value->it_value = ns_to_timespec64(val); + value->it_interval = ns_to_timespec64(interval); +} + +static int do_getitimer(int which, struct itimerspec64 *value) +{ + struct task_struct *tsk = current; + + switch (which) { + case ITIMER_REAL: + spin_lock_irq(&tsk->sighand->siglock); + value->it_value = itimer_get_remtime(&tsk->signal->real_timer); + value->it_interval = + ktime_to_timespec64(tsk->signal->it_real_incr); + spin_unlock_irq(&tsk->sighand->siglock); + break; + case ITIMER_VIRTUAL: + get_cpu_itimer(tsk, CPUCLOCK_VIRT, value); + break; + case ITIMER_PROF: + get_cpu_itimer(tsk, CPUCLOCK_PROF, value); + break; + default: + return(-EINVAL); + } + return 0; +} + +static int put_itimerval(struct __kernel_old_itimerval __user *o, + const struct itimerspec64 *i) +{ + struct __kernel_old_itimerval v; + + v.it_interval.tv_sec = i->it_interval.tv_sec; + v.it_interval.tv_usec = i->it_interval.tv_nsec / NSEC_PER_USEC; + v.it_value.tv_sec = i->it_value.tv_sec; + v.it_value.tv_usec = i->it_value.tv_nsec / NSEC_PER_USEC; + return copy_to_user(o, &v, sizeof(struct __kernel_old_itimerval)) ? -EFAULT : 0; +} + + +SYSCALL_DEFINE2(getitimer, int, which, struct __kernel_old_itimerval __user *, value) +{ + struct itimerspec64 get_buffer; + int error = do_getitimer(which, &get_buffer); + + if (!error && put_itimerval(value, &get_buffer)) + error = -EFAULT; + return error; +} + +#if defined(CONFIG_COMPAT) || defined(CONFIG_ALPHA) +struct old_itimerval32 { + struct old_timeval32 it_interval; + struct old_timeval32 it_value; +}; + +static int put_old_itimerval32(struct old_itimerval32 __user *o, + const struct itimerspec64 *i) +{ + struct old_itimerval32 v32; + + v32.it_interval.tv_sec = i->it_interval.tv_sec; + v32.it_interval.tv_usec = i->it_interval.tv_nsec / NSEC_PER_USEC; + v32.it_value.tv_sec = i->it_value.tv_sec; + v32.it_value.tv_usec = i->it_value.tv_nsec / NSEC_PER_USEC; + return copy_to_user(o, &v32, sizeof(struct old_itimerval32)) ? -EFAULT : 0; +} + +COMPAT_SYSCALL_DEFINE2(getitimer, int, which, + struct old_itimerval32 __user *, value) +{ + struct itimerspec64 get_buffer; + int error = do_getitimer(which, &get_buffer); + + if (!error && put_old_itimerval32(value, &get_buffer)) + error = -EFAULT; + return error; +} +#endif + +/* + * The timer is automagically restarted, when interval != 0 + */ +enum hrtimer_restart it_real_fn(struct hrtimer *timer) +{ + struct signal_struct *sig = + container_of(timer, struct signal_struct, real_timer); + struct pid *leader_pid = sig->pids[PIDTYPE_TGID]; + + trace_itimer_expire(ITIMER_REAL, leader_pid, 0); + kill_pid_info(SIGALRM, SEND_SIG_PRIV, leader_pid); + + return HRTIMER_NORESTART; +} + +static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id, + const struct itimerspec64 *const value, + struct itimerspec64 *const ovalue) +{ + u64 oval, nval, ointerval, ninterval; + struct cpu_itimer *it = &tsk->signal->it[clock_id]; + + nval = timespec64_to_ns(&value->it_value); + ninterval = timespec64_to_ns(&value->it_interval); + + spin_lock_irq(&tsk->sighand->siglock); + + oval = it->expires; + ointerval = it->incr; + if (oval || nval) { + if (nval > 0) + nval += TICK_NSEC; + set_process_cpu_timer(tsk, clock_id, &nval, &oval); + } + it->expires = nval; + it->incr = ninterval; + trace_itimer_state(clock_id == CPUCLOCK_VIRT ? + ITIMER_VIRTUAL : ITIMER_PROF, value, nval); + + spin_unlock_irq(&tsk->sighand->siglock); + + if (ovalue) { + ovalue->it_value = ns_to_timespec64(oval); + ovalue->it_interval = ns_to_timespec64(ointerval); + } +} + +/* + * Returns true if the timeval is in canonical form + */ +#define timeval_valid(t) \ + (((t)->tv_sec >= 0) && (((unsigned long) (t)->tv_usec) < USEC_PER_SEC)) + +static int do_setitimer(int which, struct itimerspec64 *value, + struct itimerspec64 *ovalue) +{ + struct task_struct *tsk = current; + struct hrtimer *timer; + ktime_t expires; + + switch (which) { + case ITIMER_REAL: +again: + spin_lock_irq(&tsk->sighand->siglock); + timer = &tsk->signal->real_timer; + if (ovalue) { + ovalue->it_value = itimer_get_remtime(timer); + ovalue->it_interval + = ktime_to_timespec64(tsk->signal->it_real_incr); + } + /* We are sharing ->siglock with it_real_fn() */ + if (hrtimer_try_to_cancel(timer) < 0) { + spin_unlock_irq(&tsk->sighand->siglock); + hrtimer_cancel_wait_running(timer); + goto again; + } + expires = timespec64_to_ktime(value->it_value); + if (expires != 0) { + tsk->signal->it_real_incr = + timespec64_to_ktime(value->it_interval); + hrtimer_start(timer, expires, HRTIMER_MODE_REL); + } else + tsk->signal->it_real_incr = 0; + + trace_itimer_state(ITIMER_REAL, value, 0); + spin_unlock_irq(&tsk->sighand->siglock); + break; + case ITIMER_VIRTUAL: + set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue); + break; + case ITIMER_PROF: + set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue); + break; + default: + return -EINVAL; + } + return 0; +} + +#ifdef CONFIG_SECURITY_SELINUX +void clear_itimer(void) +{ + struct itimerspec64 v = {}; + int i; + + for (i = 0; i < 3; i++) + do_setitimer(i, &v, NULL); +} +#endif + +#ifdef __ARCH_WANT_SYS_ALARM + +/** + * alarm_setitimer - set alarm in seconds + * + * @seconds: number of seconds until alarm + * 0 disables the alarm + * + * Returns the remaining time in seconds of a pending timer or 0 when + * the timer is not active. + * + * On 32 bit machines the seconds value is limited to (INT_MAX/2) to avoid + * negative timeval settings which would cause immediate expiry. + */ +static unsigned int alarm_setitimer(unsigned int seconds) +{ + struct itimerspec64 it_new, it_old; + +#if BITS_PER_LONG < 64 + if (seconds > INT_MAX) + seconds = INT_MAX; +#endif + it_new.it_value.tv_sec = seconds; + it_new.it_value.tv_nsec = 0; + it_new.it_interval.tv_sec = it_new.it_interval.tv_nsec = 0; + + do_setitimer(ITIMER_REAL, &it_new, &it_old); + + /* + * We can't return 0 if we have an alarm pending ... And we'd + * better return too much than too little anyway + */ + if ((!it_old.it_value.tv_sec && it_old.it_value.tv_nsec) || + it_old.it_value.tv_nsec >= (NSEC_PER_SEC / 2)) + it_old.it_value.tv_sec++; + + return it_old.it_value.tv_sec; +} + +/* + * For backwards compatibility? This can be done in libc so Alpha + * and all newer ports shouldn't need it. + */ +SYSCALL_DEFINE1(alarm, unsigned int, seconds) +{ + return alarm_setitimer(seconds); +} + +#endif + +static int get_itimerval(struct itimerspec64 *o, const struct __kernel_old_itimerval __user *i) +{ + struct __kernel_old_itimerval v; + + if (copy_from_user(&v, i, sizeof(struct __kernel_old_itimerval))) + return -EFAULT; + + /* Validate the timevals in value. */ + if (!timeval_valid(&v.it_value) || + !timeval_valid(&v.it_interval)) + return -EINVAL; + + o->it_interval.tv_sec = v.it_interval.tv_sec; + o->it_interval.tv_nsec = v.it_interval.tv_usec * NSEC_PER_USEC; + o->it_value.tv_sec = v.it_value.tv_sec; + o->it_value.tv_nsec = v.it_value.tv_usec * NSEC_PER_USEC; + return 0; +} + +SYSCALL_DEFINE3(setitimer, int, which, struct __kernel_old_itimerval __user *, value, + struct __kernel_old_itimerval __user *, ovalue) +{ + struct itimerspec64 set_buffer, get_buffer; + int error; + + if (value) { + error = get_itimerval(&set_buffer, value); + if (error) + return error; + } else { + memset(&set_buffer, 0, sizeof(set_buffer)); + printk_once(KERN_WARNING "%s calls setitimer() with new_value NULL pointer." + " Misfeature support will be removed\n", + current->comm); + } + + error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL); + if (error || !ovalue) + return error; + + if (put_itimerval(ovalue, &get_buffer)) + return -EFAULT; + return 0; +} + +#if defined(CONFIG_COMPAT) || defined(CONFIG_ALPHA) +static int get_old_itimerval32(struct itimerspec64 *o, const struct old_itimerval32 __user *i) +{ + struct old_itimerval32 v32; + + if (copy_from_user(&v32, i, sizeof(struct old_itimerval32))) + return -EFAULT; + + /* Validate the timevals in value. */ + if (!timeval_valid(&v32.it_value) || + !timeval_valid(&v32.it_interval)) + return -EINVAL; + + o->it_interval.tv_sec = v32.it_interval.tv_sec; + o->it_interval.tv_nsec = v32.it_interval.tv_usec * NSEC_PER_USEC; + o->it_value.tv_sec = v32.it_value.tv_sec; + o->it_value.tv_nsec = v32.it_value.tv_usec * NSEC_PER_USEC; + return 0; +} + +COMPAT_SYSCALL_DEFINE3(setitimer, int, which, + struct old_itimerval32 __user *, value, + struct old_itimerval32 __user *, ovalue) +{ + struct itimerspec64 set_buffer, get_buffer; + int error; + + if (value) { + error = get_old_itimerval32(&set_buffer, value); + if (error) + return error; + } else { + memset(&set_buffer, 0, sizeof(set_buffer)); + printk_once(KERN_WARNING "%s calls setitimer() with new_value NULL pointer." + " Misfeature support will be removed\n", + current->comm); + } + + error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL); + if (error || !ovalue) + return error; + if (put_old_itimerval32(ovalue, &get_buffer)) + return -EFAULT; + return 0; +} +#endif |