diff options
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)), }; |