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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 /samples/bpf/bpf_helpers.h | |
| parent | ada6c1de9ecabcfc5619479bcd29a208f2e248a0 (diff) | |
| download | lwn-ffeedafbf0236f03aeb2e8db273b3e5ae5f5bc89.tar.gz lwn-ffeedafbf0236f03aeb2e8db273b3e5ae5f5bc89.zip | |
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 'samples/bpf/bpf_helpers.h')
| -rw-r--r-- | samples/bpf/bpf_helpers.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h index f531a0b3282d..bdf1c1607b80 100644 --- a/samples/bpf/bpf_helpers.h +++ b/samples/bpf/bpf_helpers.h @@ -25,6 +25,12 @@ static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *) BPF_FUNC_tail_call; static unsigned long long (*bpf_get_smp_processor_id)(void) = (void *) BPF_FUNC_get_smp_processor_id; +static unsigned long long (*bpf_get_current_pid_tgid)(void) = + (void *) BPF_FUNC_get_current_pid_tgid; +static unsigned long long (*bpf_get_current_uid_gid)(void) = + (void *) BPF_FUNC_get_current_uid_gid; +static int (*bpf_get_current_comm)(void *buf, int buf_size) = + (void *) BPF_FUNC_get_current_comm; /* llvm builtin functions that eBPF C program may use to * emit BPF_LD_ABS and BPF_LD_IND instructions |