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| author |   Alexei Starovoitov <ast@plumgrid.com> | 2014-09-26 00:17:00 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-09-26 15:05:14 -0400 |
| commit | 09756af46893c18839062976c3252e93a1beeba7 (patch) | |
| tree | 203642a5473496ecb6ff10cd22dba39b22ed5f0a /include/linux/filter.h | |
| parent | bpf: add lookup/update/delete/iterate methods to BPF maps (diff) | |
| download | linux-dev-09756af46893c18839062976c3252e93a1beeba7.tar.xz linux-dev-09756af46893c18839062976c3252e93a1beeba7.zip | |
bpf: expand BPF syscall with program load/unload
eBPF programs are similar to kernel modules. They are loaded by the user
process and automatically unloaded when process exits. Each eBPF program is
a safe run-to-completion set of instructions. eBPF verifier statically
determines that the program terminates and is safe to execute.
The following syscall wrapper can be used to load the program:
int bpf_prog_load(enum bpf_prog_type prog_type,
const struct bpf_insn *insns, int insn_cnt,
const char *license)
{
union bpf_attr attr = {
.prog_type = prog_type,
.insns = ptr_to_u64(insns),
.insn_cnt = insn_cnt,
.license = ptr_to_u64(license),
};
return bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
}
where 'insns' is an array of eBPF instructions and 'license' is a string
that must be GPL compatible to call helper functions marked gpl_only
Upon succesful load the syscall returns prog_fd.
Use close(prog_fd) to unload the program.
User space tests and examples follow in the later patches
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/filter.h')
| -rw-r--r-- | include/linux/filter.h | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 1a0bc6d134d7..4ffc0958d85e 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -21,6 +21,7 @@ struct sk_buff; struct sock; struct seccomp_data; +struct bpf_prog_aux; /* ArgX, context and stack frame pointer register positions. Note, * Arg1, Arg2, Arg3, etc are used as argument mappings of function @@ -300,17 +301,12 @@ struct bpf_binary_header { u8 image[]; }; -struct bpf_work_struct { - struct bpf_prog *prog; - struct work_struct work; -}; - struct bpf_prog { u16 pages; /* Number of allocated pages */ bool jited; /* Is our filter JIT'ed? */ u32 len; /* Number of filter blocks */ struct sock_fprog_kern *orig_prog; /* Original BPF program */ - struct bpf_work_struct *work; /* Deferred free work struct */ + struct bpf_prog_aux *aux; /* Auxiliary fields */ unsigned int (*bpf_func)(const struct sk_buff *skb, const struct bpf_insn *filter); /* Instructions for interpreter */ |