path: root/samples/bpf/bpf_helpers.h
diff options
authorAlexei Starovoitov <>2015-06-12 19:39:12 -0700
committerDavid S. Miller <>2015-06-15 15:53:50 -0700
commitffeedafbf0236f03aeb2e8db273b3e5ae5f5bc89 (patch)
treee00f1b0bba1c217afbcf4dda00ef950afdfcafbc /samples/bpf/bpf_helpers.h
parentada6c1de9ecabcfc5619479bcd29a208f2e248a0 (diff)
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 <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'samples/bpf/bpf_helpers.h')
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