kernel/linux.git/tools/lib/bpf, branch v6.7.3

libbpf: Add link-based API for netkit

2023-10-24T23:06:58+00:00

This adds bpf_program__attach_netkit() API to libbpf. Overall it is very similar to tcx. The API looks as following: LIBBPF_API struct bpf_link * bpf_program__attach_netkit(const struct bpf_program *prog, int ifindex, const struct bpf_netkit_opts *opts); The struct bpf_netkit_opts is done in similar way as struct bpf_tcx_opts for supporting bpf_mprog control parameters. The attach location for the primary and peer device is derived from the program section "netkit/primary" and "netkit/peer", respectively. Signed-off-by: Daniel Borkmann Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20231024214904.29825-4-daniel@iogearbox.net Signed-off-by: Martin KaFai Lau

libbpf: Don't assume SHT_GNU_verdef presence for SHT_GNU_versym section

2023-10-17T09:43:20+00:00

Fix too eager assumption that SHT_GNU_verdef ELF section is going to be present whenever binary has SHT_GNU_versym section. It seems like either SHT_GNU_verdef or SHT_GNU_verneed can be used, so failing on missing SHT_GNU_verdef actually breaks use cases in production. One specific reported issue, which was used to manually test this fix, was trying to attach to `readline` function in BASH binary. Fixes: bb7fa09399b9 ("libbpf: Support symbol versioning for uprobe") Reported-by: Liam Wisehart Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Tested-by: Manu Bretelle Reviewed-by: Fangrui Song Acked-by: Hengqi Chen Link: https://lore.kernel.org/bpf/20231016182840.4033346-1-andrii@kernel.org

libbpf: Add support for cgroup unix socket address hooks

2023-10-12T00:27:55+00:00

Add the necessary plumbing to hook up the new cgroup unix sockaddr hooks into libbpf. Signed-off-by: Daan De Meyer Link: https://lore.kernel.org/r/20231011185113.140426-6-daan.j.demeyer@gmail.com Signed-off-by: Martin KaFai Lau

libbpf: Fix syscall access arguments on riscv

2023-10-04T20:19:13+00:00

Since commit 08d0ce30e0e4 ("riscv: Implement syscall wrappers"), riscv selects ARCH_HAS_SYSCALL_WRAPPER so let's use the generic implementation of PT_REGS_SYSCALL_REGS(). Fixes: 08d0ce30e0e4 ("riscv: Implement syscall wrappers") Signed-off-by: Alexandre Ghiti Signed-off-by: Andrii Nakryiko Reviewed-by: Sami Tolvanen Link: https://lore.kernel.org/bpf/20231004110905.49024-2-bjorn@kernel.org

libbpf: Allow Golang symbols in uprobe secdef

2023-09-29T21:32:20+00:00

Golang symbols in ELF files are different from C/C++ which contains special characters like '*', '(' and ')'. With generics, things get more complicated, there are symbols like: github.com/cilium/ebpf/internal.(*Deque[go.shape.interface { Format(fmt.State, int32); TypeName() string;github.com/cilium/ebpf/btf.copy() github.com/cilium/ebpf/btf.Type}]).Grow Matching such symbols using `%m[^\n]` in sscanf, this excludes newline which typically does not appear in ELF symbols. This should work in most use-cases and also work for unicode letters in identifiers. If newline do show up in ELF symbols, users can still attach to such symbol by specifying bpf_uprobe_opts::func_name. A working example can be found at this repo ([0]). [0]: https://github.com/chenhengqi/libbpf-go-symbols Suggested-by: Andrii Nakryiko Signed-off-by: Hengqi Chen Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230929155954.92448-1-hengqi.chen@gmail.com

libbpf: Add ring__consume

2023-09-25T23:22:43+00:00

Add ring__consume to consume a single ringbuffer, analogous to ring_buffer__consume. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-14-martin.kelly@crowdstrike.com

libbpf: Add ring__map_fd

2023-09-25T23:22:43+00:00

Add ring__map_fd to get the file descriptor underlying a given ringbuffer. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-12-martin.kelly@crowdstrike.com

libbpf: Add ring__size

2023-09-25T23:22:43+00:00

Add ring__size to get the total size of a given ringbuffer. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-10-martin.kelly@crowdstrike.com

libbpf: Add ring__avail_data_size

2023-09-25T23:22:42+00:00

Add ring__avail_data_size for querying the currently available data in the ringbuffer, similar to the BPF_RB_AVAIL_DATA flag in bpf_ringbuf_query. This is racy during ongoing operations but is still useful for overall information on how a ringbuffer is behaving. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-8-martin.kelly@crowdstrike.com

libbpf: Add ring__producer_pos, ring__consumer_pos

2023-09-25T23:22:42+00:00

Add APIs to get the producer and consumer position for a given ringbuffer. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-6-martin.kelly@crowdstrike.com