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| author | David Ahern <dsahern@gmail.com> | 2017-09-01 01:05:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-01 08:05:15 +0300 |
| commit | 0adc3dd90050538ac543c6c0bea8e8527a9e2e2c (patch) | |
| tree | 0455bd99d3cc18191b603ef13342b1b4386e38e3 /samples/bpf/test_cgrp2_sock.c | |
| parent | 33aeb5e30acac9ae68cb5acc4eecc1fca4358859 (diff) | |
| download | linux-0adc3dd90050538ac543c6c0bea8e8527a9e2e2c.tar.xz | |
samples/bpf: Update cgroup socket examples to use uid gid helper
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/test_cgrp2_sock.c')
| -rw-r--r-- | samples/bpf/test_cgrp2_sock.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/samples/bpf/test_cgrp2_sock.c b/samples/bpf/test_cgrp2_sock.c index 5a688837720c..e79594dd629b 100644 --- a/samples/bpf/test_cgrp2_sock.c +++ b/samples/bpf/test_cgrp2_sock.c @@ -46,8 +46,18 @@ static int prog_load(__u32 idx, __u32 mark, __u32 prio) /* set mark on socket */ struct bpf_insn prog_mark[] = { - BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), + /* get uid of process */ + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, + BPF_FUNC_get_current_uid_gid), + BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffffffff), + + /* if uid is 0, use given mark, else use the uid as the mark */ + BPF_MOV64_REG(BPF_REG_3, BPF_REG_0), + BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1), BPF_MOV64_IMM(BPF_REG_3, mark), + + /* set the mark on the new socket */ + BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), BPF_MOV64_IMM(BPF_REG_2, offsetof(struct bpf_sock, mark)), BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3, offsetof(struct bpf_sock, mark)), }; |