kernel/samples/bpf/test_cgrp2_sock.c, branch linux-5.10.y

samples/bpf: Fix a resource leak

2024-12-14T18:48:26Z

[ Upstream commit f3ef53174b23246fe9bc2bbc2542f3a3856fa1e2 ] The opened file should be closed in show_sockopts(), otherwise resource leak will occur that this problem was discovered by reading code Signed-off-by: Zhu Jun Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20241010014126.2573-1-zhujun2@cmss.chinamobile.com Signed-off-by: Sasha Levin

samples: bpf: rename libbpf.h to bpf_insn.h

2018-05-15T05:52:10Z

The libbpf.h file in samples is clashing with libbpf's header. Since it only includes a subset of filter.h instruction helpers rename it to bpf_insn.h. Drop the unnecessary include of bpf/bpf.h. Signed-off-by: Jakub Kicinski Acked-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov

samples/bpf: Update cgroup socket examples to use uid gid helper

2017-09-01T05:05:15Z

Signed-off-by: David Ahern Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Add option to dump socket settings

2017-09-01T05:05:15Z

Add option to dump socket settings. Will be used in the next patch to verify bpf programs are correctly setting mark, priority and device based on the cgroup attachment for the program run. Signed-off-by: David Ahern Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Add detach option to test_cgrp2_sock

2017-09-01T05:05:15Z

Add option to detach programs from a cgroup. Signed-off-by: David Ahern Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Update sock test to allow setting mark and priority

2017-09-01T05:05:15Z

Update sock test to set mark and priority on socket create. Signed-off-by: David Ahern Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

bpf: introduce BPF_F_ALLOW_OVERRIDE flag

2017-02-13T02:52:19Z

If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command to the given cgroup the descendent cgroup will be able to override effective bpf program that was inherited from this cgroup. By default it's not passed, therefore override is disallowed. Examples: 1. prog X attached to /A with default prog Y fails to attach to /A/B and /A/B/C Everything under /A runs prog X 2. prog X attached to /A with allow_override. prog Y fails to attach to /A/B with default (non-override) prog M attached to /A/B with allow_override. Everything under /A/B runs prog M only. 3. prog X attached to /A with allow_override. prog Y fails to attach to /A with default. The user has to detach first to switch the mode. In the future this behavior may be extended with a chain of non-overridable programs. Also fix the bug where detach from cgroup where nothing is attached was not throwing error. Return ENOENT in such case. Add several testcases and adjust libbpf. Fixes: 3007098494be ("cgroup: add support for eBPF programs") Signed-off-by: Alexei Starovoitov Acked-by: Daniel Borkmann Acked-by: Tejun Heo Acked-by: Daniel Mack Signed-off-by: David S. Miller

samples/bpf: Switch over to libbpf

2016-12-20T15:00:38Z

Now that libbpf under tools/lib/bpf/* is synced with the version from samples/bpf, we can get rid most of the libbpf library here. Committer notes: Built it in a docker fedora rawhide container and ran it in the f25 host, seems to work just like it did before this patch, i.e. the switch to tools/lib/bpf/ doesn't seem to have introduced problems and Joe said he tested it with all the entries in samples/bpf/ and other code he found: [root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux headers_install [root@f5065a7d6272 linux]# rm -rf /tmp/build/linux/samples/bpf/ [root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux samples/bpf/ make[1]: Entering directory '/tmp/build/linux' CHK include/config/kernel.release HOSTCC scripts/basic/fixdep GEN ./Makefile CHK include/generated/uapi/linux/version.h Using /git/linux as source for kernel CHK include/generated/utsrelease.h HOSTCC scripts/basic/bin2c HOSTCC arch/x86/tools/relocs_32.o HOSTCC arch/x86/tools/relocs_64.o LD samples/bpf/built-in.o HOSTCC samples/bpf/fds_example.o HOSTCC samples/bpf/sockex1_user.o /git/linux/samples/bpf/fds_example.c: In function 'bpf_prog_create': /git/linux/samples/bpf/fds_example.c:63:6: warning: passing argument 2 of 'bpf_load_program' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] insns, insns_cnt, "GPL", 0, ^~~~~ In file included from /git/linux/samples/bpf/libbpf.h:5:0, from /git/linux/samples/bpf/bpf_load.h:4, from /git/linux/samples/bpf/fds_example.c:15: /git/linux/tools/lib/bpf/bpf.h:31:5: note: expected 'struct bpf_insn *' but argument is of type 'const struct bpf_insn *' int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, ^~~~~~~~~~~~~~~~ HOSTCC samples/bpf/sockex2_user.o HOSTCC samples/bpf/xdp_tx_iptunnel_user.o clang -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/6.2.1/include -I/git/linux/arch/x86/include -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated -I/git/linux/include -I./include -I/git/linux/arch/x86/include/uapi -I/git/linux/include/uapi -I./include/generated/uapi -include /git/linux/include/linux/kconfig.h \ -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \ -Wno-compare-distinct-pointer-types \ -Wno-gnu-variable-sized-type-not-at-end \ -Wno-address-of-packed-member -Wno-tautological-compare \ -O2 -emit-llvm -c /git/linux/samples/bpf/sockex1_kern.c -o -| llc -march=bpf -filetype=obj -o samples/bpf/sockex1_kern.o HOSTLD samples/bpf/tc_l2_redirect HOSTLD samples/bpf/lwt_len_hist HOSTLD samples/bpf/xdp_tx_iptunnel make[1]: Leaving directory '/tmp/build/linux' [root@f5065a7d6272 linux]# And then, in the host: [root@jouet bpf]# mount | grep "docker.*devicemapper\/" /dev/mapper/docker-253:0-1705076-9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9 on /var/lib/docker/devicemapper/mnt/9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9 type xfs (rw,relatime,context="system_u:object_r:container_file_t:s0:c73,c276",nouuid,attr2,inode64,sunit=1024,swidth=1024,noquota) [root@jouet bpf]# cd /var/lib/docker/devicemapper/mnt/9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9/rootfs/tmp/build/linux/samples/bpf/ [root@jouet bpf]# file offwaketime offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=f423d171e0487b2f802b6a792657f0f3c8f6d155, not stripped [root@jouet bpf]# readelf -SW offwaketime offwaketime offwaketime_kern.o offwaketime_user.o [root@jouet bpf]# readelf -SW offwaketime_kern.o There are 11 section headers, starting at offset 0x700: Section Headers: [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 0] NULL 0000000000000000 000000 000000 00 0 0 0 [ 1] .strtab STRTAB 0000000000000000 000658 0000a8 00 0 0 1 [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4 [ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8 [ 4] .relkprobe/try_to_wake_up REL 0000000000000000 0005a8 000020 10 10 3 8 [ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8 [ 6] .reltracepoint/sched/sched_switch REL 0000000000000000 0005c8 000090 10 10 5 8 [ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4 [ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1 [ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4 [10] .symtab SYMTAB 0000000000000000 000488 000120 18 1 4 8 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings) I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown) O (extra OS processing required) o (OS specific), p (processor specific) [root@jouet bpf]# ./offwaketime | head -3 qemu-system-x86;entry_SYSCALL_64_fastpath;sys_ppoll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;hrtimer_wakeup;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel;start_cpu;;swapper/0 4 firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 1 swapper/2;start_cpu;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 61 [root@jouet bpf]# Signed-off-by: Joe Stringer Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: https://github.com/joestringer/linux/commit/5c40f54a52b1f437123c81e21873f4b4b1f9bd55.patch Link: http://lkml.kernel.org/n/tip-xr8twtx7sjh5821g8qw47yxk@git.kernel.org [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds, as noticed by Wang Nan ] Signed-off-by: Arnaldo Carvalho de Melo

samples/bpf: Make samples more libbpf-centric

2016-12-15T19:25:47Z

Switch all of the sample code to use the function names from tools/lib/bpf so that they're consistent with that, and to declare their own log buffers. This allow the next commit to be purely devoted to getting rid of the duplicate library in samples/bpf. Committer notes: Testing it: On a fedora rawhide container, with clang/llvm 3.9, sharing the host linux kernel git tree: # make O=/tmp/build/linux/ headers_install # make O=/tmp/build/linux -C samples/bpf/ Since I forgot to make it privileged, just tested it outside the container, using what it generated: # uname -a Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux # cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/ # ls -la offwaketime -rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime # file offwaketime offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped # readelf -SW offwaketime_kern.o | grep PROGBITS [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4 [ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8 [ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8 [ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4 [ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1 [ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4 # ./offwaketime | head -5 swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106 CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2 Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5 firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13 JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2 # Signed-off-by: Joe Stringer Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

samples: bpf: add userspace example for modifying sk_bound_dev_if

2016-12-02T18:46:08Z

Add a simple program to demonstrate the ability to attach a bpf program to a cgroup that sets sk_bound_dev_if for AF_INET{6} sockets when they are created. Signed-off-by: David Ahern Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller