bpftool: Add support for task local storage

2020-11-06T16:08:37+00:00

Updates the binary to handle the BPF_MAP_TYPE_TASK_STORAGE as "task_storage" for printing and parsing. Also updates the documentation and bash completion Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20201106103747.2780972-5-kpsingh@chromium.org

tools: bpftool: Add "inner_map" to "bpftool map create" outer maps

2020-09-11T00:29:21+00:00

There is no support for creating maps of types array-of-map or hash-of-map in bpftool. This is because the kernel needs an inner_map_fd to collect metadata on the inner maps to be supported by the new map, but bpftool does not provide a way to pass this file descriptor. Add a new optional "inner_map" keyword that can be used to pass a reference to a map, retrieve a fd to that map, and pass it as the inner_map_fd. Add related documentation and bash completion. Note that we can reference the inner map by its name, meaning we can have several times the keyword "name" with different meanings (mandatory outer map name, and possibly a name to use to find the inner_map_fd). The bash completion will offer it just once, and will not suggest "name" on the following command: # bpftool map create /sys/fs/bpf/my_outer_map type hash_of_maps \ inner_map name my_inner_map [TAB] Fixing that specific case seems too convoluted. Completion will work as expected, however, if the outer map name comes first and the "inner_map name ..." is passed second. Signed-off-by: Quentin Monnet Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200910102652.10509-4-quentin@isovalent.com

bpf: Implement bpf_local_storage for inodes

2020-08-25T22:00:04+00:00

Similar to bpf_local_storage for sockets, add local storage for inodes. The life-cycle of storage is managed with the life-cycle of the inode. i.e. the storage is destroyed along with the owning inode. The BPF LSM allocates an __rcu pointer to the bpf_local_storage in the security blob which are now stackable and can co-exist with other LSMs. Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200825182919.1118197-6-kpsingh@chromium.org

tools/bpftool: Add documentation and bash-completion for `link detach`

2020-08-02T03:38:29+00:00

Add info on link detach sub-command to man page. Add detach to bash-completion as well. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Acked-by: John Fastabend

tools/bpftool: Add bpftool support for bpf map element iterator

2020-07-26T03:16:33+00:00

The optional parameter "map MAP" can be added to "bpftool iter" command to create a bpf iterator for map elements. For example, bpftool iter pin ./prog.o /sys/fs/bpf/p1 map id 333 For map element bpf iterator "map MAP" parameter is required. Otherwise, bpf link creation will return an error. Quentin Monnet kindly provided bash-completion implementation for new "map MAP" option. Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200723184119.590799-1-yhs@fb.com

tools/bpftool: Add name mappings for SK_LOOKUP prog and attach type

2020-07-18T03:18:17+00:00

Make bpftool show human-friendly identifiers for newly introduced program and attach type, BPF_PROG_TYPE_SK_LOOKUP and BPF_SK_LOOKUP, respectively. Also, add the new prog type bash-completion, man page and help message. Signed-off-by: Jakub Sitnicki Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200717103536.397595-14-jakub@cloudflare.com

bpf, bpftool: Enable get{peer, sock}name attach types

2020-05-19T18:32:04+00:00

Make bpftool aware and add the new get{peer,sock}name attach types to its cli, documentation and bash completion to allow attachment/detachment of sock_addr programs there. Signed-off-by: Daniel Borkmann Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Acked-by: Andrey Ignatov Link: https://lore.kernel.org/bpf/9765b3d03e4c29210c4df56a9cc7e52f5f7bb5ef.1589841594.git.daniel@iogearbox.net

tools/bpftool: Add bpf_iter support for bptool

2020-05-10T00:05:27+00:00

Currently, only one command is supported bpftool iter pin It will pin the trace/iter bpf program in the object file to the where should be on a bpffs mount. For example, $ bpftool iter pin ./bpf_iter_ipv6_route.o \ /sys/fs/bpf/my_route User can then do a `cat` to print out the results: $ cat /sys/fs/bpf/my_route fe800000000000000000000000000000 40 00000000000000000000000000000000 ... 00000000000000000000000000000000 00 00000000000000000000000000000000 ... 00000000000000000000000000000001 80 00000000000000000000000000000000 ... fe800000000000008c0162fffebdfd57 80 00000000000000000000000000000000 ... ff000000000000000000000000000000 08 00000000000000000000000000000000 ... 00000000000000000000000000000000 00 00000000000000000000000000000000 ... The implementation for ipv6_route iterator is in one of subsequent patches. This patch also added BPF_LINK_TYPE_ITER to link query. In the future, we may add additional parameters to pin command by parameterizing the bpf iterator. For example, a map_id or pid may be added to let bpf program only traverses a single map or task, similar to kernel seq_file single_open(). We may also add introspection command for targets/iterators by leveraging the bpf_iter itself. Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200509175920.2477247-1-yhs@fb.com

tools: bpftool: Allow unprivileged users to probe features

2020-04-29T21:25:11+00:00

There is demand for a way to identify what BPF helper functions are available to unprivileged users. To do so, allow unprivileged users to run "bpftool feature probe" to list BPF-related features. This will only show features accessible to those users, and may not reflect the full list of features available (to administrators) on the system. To avoid the case where bpftool is inadvertently run as non-root and would list only a subset of the features supported by the system when it would be expected to list all of them, running as unprivileged is gated behind the "unprivileged" keyword passed to the command line. When used by a privileged user, this keyword allows to drop the CAP_SYS_ADMIN and to list the features available to unprivileged users. Note that this addsd a dependency on libpcap for compiling bpftool. Note that there is no particular reason why the probes were restricted to root, other than the fact I did not need them for unprivileged and did not bother with the additional checks at the time probes were added. Signed-off-by: Quentin Monnet Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20200429144506.8999-3-quentin@isovalent.com

bpftool: Add link bash completions

2020-04-29T00:27:08+00:00

Extend bpftool's bash-completion script to handle new link command and its sub-commands. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Reviewed-by: Quentin Monnet Link: https://lore.kernel.org/bpf/20200429001614.1544-11-andriin@fb.com

kernel/linux.git/tools/bpf/bpftool/bash-completion, branch linux-5.11.y