Alexei Starovoitov db20fd2b01 bpf: add lookup/update/delete/iterate methods to BPF maps ... 'maps' is a generic storage of different types for sharing data between kernel and userspace. The maps are accessed from user space via BPF syscall, which has commands: - create a map with given type and attributes fd = bpf(BPF_MAP_CREATE, union bpf_attr *attr, u32 size) returns fd or negative error - lookup key in a given map referenced by fd err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero and stores found elem into value or negative error - create or update key/value pair in a given map err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero or negative error - find and delete element by key in a given map err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key - iterate map elements (based on input key return next_key) err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->next_key - close(fd) deletes the map Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-09-26 15:05:14 -04:00
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core.c	net: bpf: only build bpf_jit_binary_{alloc, free}() when jit selected	2014-09-10 14:05:07 -07:00
Makefile	bpf: introduce BPF syscall and maps	2014-09-26 15:05:14 -04:00
syscall.c	bpf: add lookup/update/delete/iterate methods to BPF maps	2014-09-26 15:05:14 -04:00