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8740ca9dcd
While sock_diag is able to return BPF socket-local storage in response to INET_DIAG_REQ_SK_BPF_STORAGES requests, ss doesn't request it. This change introduces the --bpf-maps and --bpf-map-id= options to request BPF socket-local storage for all SK_STORAGE maps, or only specific ones. The bigger part of this change will check the requested map IDs and ensure they are valid. The column COL_EXT is used to print the socket-local data into. When --bpf-maps is used, ss will send an empty INET_DIAG_REQ_SK_BPF_STORAGES request, in return the kernel will send all the BPF socket-local storage entries for a given socket. The BTF data for each map is loaded on demand, as ss can't predict which map ID are used. When --bpf-map-id=ID is used, a file descriptor to the requested maps is open to 1) ensure the map doesn't disappear before the data is printed, and 2) ensure the map type is BPF_MAP_TYPE_SK_STORAGE. The BTF data for each requested map is loaded before the request is sent to the kernel. Co-developed-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Quentin Deslandes <qde@naccy.de> Signed-off-by: David Ahern <dsahern@kernel.org>