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| author | Alexei Starovoitov <ast@plumgrid.com> | 2015-06-12 19:39:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-15 15:53:50 -0700 |
| commit | ffeedafbf0236f03aeb2e8db273b3e5ae5f5bc89 (patch) | |
| tree | e00f1b0bba1c217afbcf4dda00ef950afdfcafbc /kernel/trace | |
| parent | ada6c1de9ecabcfc5619479bcd29a208f2e248a0 (diff) | |
| download | linux-ffeedafbf0236f03aeb2e8db273b3e5ae5f5bc89.tar.bz2 | |
bpf: introduce current->pid, tgid, uid, gid, comm accessors
eBPF programs attached to kprobes need to filter based on
current->pid, uid and other fields, so introduce helper functions:
u64 bpf_get_current_pid_tgid(void)
Return: current->tgid << 32 | current->pid
u64 bpf_get_current_uid_gid(void)
Return: current_gid << 32 | current_uid
bpf_get_current_comm(char *buf, int size_of_buf)
stores current->comm into buf
They can be used from the programs attached to TC as well to classify packets
based on current task fields.
Update tracex2 example to print histogram of write syscalls for each process
instead of aggregated for all.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 50c4015a8ad3..3a17638cdf46 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -162,6 +162,12 @@ static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func return &bpf_ktime_get_ns_proto; case BPF_FUNC_tail_call: return &bpf_tail_call_proto; + case BPF_FUNC_get_current_pid_tgid: + return &bpf_get_current_pid_tgid_proto; + case BPF_FUNC_get_current_uid_gid: + return &bpf_get_current_uid_gid_proto; + case BPF_FUNC_get_current_comm: + return &bpf_get_current_comm_proto; case BPF_FUNC_trace_printk: /* |