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path: root/samples/bpf/xdp_tx_iptunnel_user.c
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2020-12-02bpf: samples: Do not touch RLIMIT_MEMLOCKRoman Gushchin
Since bpf is not using rlimit memlock for the memory accounting and control, do not change the limit in sample applications. Signed-off-by: Roman Gushchin <guro@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20201201215900.3569844-35-guro@fb.com
2020-01-20samples/bpf: Use consistent include paths for libbpfToke Høiland-Jørgensen
Fix all files in samples/bpf to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To make sure no new files are introduced that doesn't include the bpf/ prefix in its include, remove tools/lib/bpf from the include path entirely, and use tools/lib instead. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
2019-12-16samples/bpf: Attach XDP programs in driver mode by defaultToke Høiland-Jørgensen
When attaching XDP programs, userspace can set flags to request the attach mode (generic/SKB mode, driver mode or hw offloaded mode). If no such flags are requested, the kernel will attempt to attach in driver mode, and then silently fall back to SKB mode if this fails. The silent fallback is a major source of user confusion, as users will try to load a program on a device without XDP support, and instead of an error they will get the silent fallback behaviour, not notice, and then wonder why performance is not what they were expecting. In an attempt to combat this, let's switch all the samples to default to explicitly requesting driver-mode attach. As part of this, ensure that all the userspace utilities have a switch to enable SKB mode. For those that have a switch to request driver mode, keep it but turn it into a no-op. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: David Ahern <dsahern@gmail.com> Link: https://lore.kernel.org/bpf/20191216110742.364456-1-toke@redhat.com
2019-11-08samples: bpf: Update outdated error messageDaniel T. Lee
Currently, under samples, several methods are being used to load bpf program. Since using libbpf is preferred solution, lots of previously used 'load_bpf_file' from bpf_load are replaced with 'bpf_prog_load_xattr' from libbpf. But some of the error messages still show up as 'load_bpf_file' instead of 'bpf_prog_load_xattr'. This commit fixes outdated errror messages under samples and fixes some code style issues. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191107005153.31541-2-danieltimlee@gmail.com
2019-06-26samples: bpf: make the use of xdp samples consistentDaniel T. Lee
Currently, each xdp samples are inconsistent in the use. Most of the samples fetch the interface with it's name. (ex. xdp1, xdp2skb, xdp_redirect_cpu, xdp_sample_pkts, etc.) But some of the xdp samples are fetching the interface with ifindex by command argument. This commit enables xdp samples to fetch interface with it's name without changing the original index interface fetching. (<ifname|ifindex> fetching in the same way as xdp_sample_pkts_user.c does.) Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-06-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextDavid S. Miller
Alexei Starovoitov says: ==================== pull-request: bpf-next 2019-06-19 The following pull-request contains BPF updates for your *net-next* tree. The main changes are: 1) new SO_REUSEPORT_DETACH_BPF setsocktopt, from Martin. 2) BTF based map definition, from Andrii. 3) support bpf_map_lookup_elem for xskmap, from Jonathan. 4) bounded loops and scalar precision logic in the verifier, from Alexei. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2019-06-18samples: bpf: refactor header include pathDaniel T. Lee
Currently, header inclusion in each file is inconsistent. For example, "libbpf.h" header is included as multiple ways. #include "bpf/libbpf.h" #include "libbpf.h" Due to commit b552d33c80a9 ("samples/bpf: fix include path in Makefile"), $(srctree)/tools/lib/bpf/ path had been included during build, path "bpf/" in header isn't necessary anymore. This commit removes path "bpf/" in header inclusion. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of version 2 of the gnu general public license as published by the free software foundation extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 107 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-01samples/bpf: Check the prog id before exitingMaciej Fijalkowski
Check the program id within the signal handler on polling xdp samples that were previously converted to libbpf usage. Avoid the situation of unloading the program that was not attached by sample that is exiting. Handle also the case where bpf_get_link_xdp_id didn't exit with an error but the xdp program was not found on an interface. Reported-by: Michal Papaj <michal.papaj@intel.com> Reported-by: Jakub Spizewski <jakub.spizewski@intel.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-02-01samples/bpf: Add a "force" flag to XDP samplesMaciej Fijalkowski
Make xdp samples consistent with iproute2 behavior and set the XDP_FLAGS_UPDATE_IF_NOEXIST by default when setting the xdp program on interface. Provide an option for user to force the program loading, which as a result will not include the mentioned flag in bpf_set_link_xdp_fd call. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-02-01samples/bpf: Convert XDP samples to libbpf usageMaciej Fijalkowski
Some of XDP samples that are attaching the bpf program to the interface via libbpf's bpf_set_link_xdp_fd are still using the bpf_load.c for loading and manipulating the ebpf program and maps. Convert them to do this through libbpf usage and remove bpf_load from the picture. While at it remove what looks like debug leftover in xdp_redirect_map_user.c In xdp_redirect_cpu, change the way that the program to be loaded onto interface is chosen - user now needs to pass the program's section name instead of the relative number. In case of typo print out the section names to choose from. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-14samples: bpf: include bpf/bpf.h instead of local libbpf.hJakub Kicinski
There are two files in the tree called libbpf.h which is becoming problematic. Most samples don't actually need the local libbpf.h they simply include it to get to bpf/bpf.h. Include bpf/bpf.h directly instead. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-02-02samples/bpf: use bpf_set_link_xdp_fdEric Leblond
Use bpf_set_link_xdp_fd instead of set_link_xdp_fd to remove some code duplication and benefit of netlink ext ack errors message. Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2017-05-11samples/bpf: run cleanup routines when receiving SIGTERMAndy Gospodarek
Shahid Habib noticed that when xdp1 was killed from a different console the xdp program was not cleaned-up properly in the kernel and it continued to forward traffic. Most of the applications in samples/bpf cleanup properly, but only when getting SIGINT. Since kill defaults to using SIGTERM, add support to cleanup when the application receives either SIGINT or SIGTERM. Signed-off-by: Andy Gospodarek <andy@greyhouse.net> Reported-by: Shahid Habib <shahid.habib@broadcom.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-11xdp: add flag to enforce driver modeDaniel Borkmann
After commit b5cdae3291f7 ("net: Generic XDP") we automatically fall back to a generic XDP variant if the driver does not support native XDP. Allow for an option where the user can specify that always the native XDP variant should be selected and in case it's not supported by a driver, just bail out. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-01samples/bpf: fix XDP_FLAGS_SKB_MODE detach for xdp_tx_iptunnelJesper Dangaard Brouer
The xdp_tx_iptunnel program can be terminated in two ways, after N-seconds or via Ctrl-C SIGINT. The SIGINT code path does not handle detatching the correct XDP program, in-case the program was attached with XDP_FLAGS_SKB_MODE. Fix this by storing the XDP flags as a global variable, which is available for the SIGINT handler function. Fixes: 3993f2cb983b ("samples/bpf: Add support for SKB_MODE to xdp1 and xdp_tx_iptunnel") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-01samples/bpf: fix SKB_MODE flag to be a 32-bit unsigned intJesper Dangaard Brouer
The kernel side of XDP_FLAGS_SKB_MODE is unsigned, and the rtnetlink IFLA_XDP_FLAGS is defined as NLA_U32. Thus, userspace programs under samples/bpf/ should use the correct type. Fixes: 3993f2cb983b ("samples/bpf: Add support for SKB_MODE to xdp1 and xdp_tx_iptunnel") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-27samples/bpf: Add support for SKB_MODE to xdp1 and xdp_tx_iptunnelDavid Ahern
Add option to xdp1 and xdp_tx_iptunnel to insert xdp program in SKB_MODE: - update set_link_xdp_fd to take a flags argument that is added to the RTM_SETLINK message - Add -S option to xdp1 and xdp_tx_iptunnel user code. When passed in XDP_FLAGS_SKB_MODE is set in the flags arg passed to set_link_xdp_fd Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-15samples/bpf: Make samples more libbpf-centricJoe Stringer
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 <joe@ovn.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-12-08bpf: xdp: Add XDP example for head adjustmentMartin KaFai Lau
The XDP prog checks if the incoming packet matches any VIP:PORT combination in the BPF hashmap. If it is, it will encapsulate the packet with a IPv4/v6 header as instructed by the value of the BPF hashmap and then XDP_TX it out. The VIP:PORT -> IP-Encap-Info can be specified by the cmd args of the user prog. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>