diff options
Diffstat (limited to 'gencode.c')
| -rw-r--r-- | gencode.c | 8 |
1 files changed, 6 insertions, 2 deletions
@@ -8574,7 +8574,7 @@ gen_vlan(compiler_state_t *cstate, int vlan_num) * support for MPLS */ struct block * -gen_mpls(compiler_state_t *cstate, int label_num) +gen_mpls(compiler_state_t *cstate, bpf_u_int32 label_num, int has_label_num) { struct block *b0, *b1; @@ -8612,7 +8612,11 @@ gen_mpls(compiler_state_t *cstate, int label_num) } /* If a specific MPLS label is requested, check it */ - if (label_num >= 0) { + if (has_label_num) { + if (label_num > 0xFFFFF) { + bpf_error(cstate, "MPLS label %u greater than maximum %u", + label_num, 0xFFFFF); + } label_num = label_num << 12; /* label is shifted 12 bits on the wire */ b1 = gen_mcmp(cstate, OR_LINKPL, 0, BPF_W, (bpf_int32)label_num, 0xfffff000); /* only compare the first 20 bits */ |