bpf: allow BPF programs access 'protocol' and 'vlan_tci' fields

as a follow on to patch 70006af95515 ("bpf: allow eBPF access skb fields")
this patch allows 'protocol' and 'vlan_tci' fields to be accessible
from extended BPF programs.

The usage of 'protocol', 'vlan_present' and 'vlan_tci' fields is the same as
corresponding SKF_AD_PROTOCOL, SKF_AD_VLAN_TAG_PRESENT and SKF_AD_VLAN_TAG
accesses in classic BPF.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/samples/bpf/test_verifier.c b/samples/bpf/test_verifier.c
index df6dbb6576f6..75d561f9fd6a 100644
--- a/samples/bpf/test_verifier.c
+++ b/samples/bpf/test_verifier.c
@@ -658,6 +658,15 @@ static struct bpf_test tests[] = {
                         BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
                                     offsetof(struct __sk_buff, queue_mapping)),
                         BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
+                        BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+                                    offsetof(struct __sk_buff, protocol)),
+                        BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
+                        BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+                                    offsetof(struct __sk_buff, vlan_present)),
+                        BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
+                        BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+                                    offsetof(struct __sk_buff, vlan_tci)),
+                        BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
                         BPF_EXIT_INSN(),
                 },
                 .result = ACCEPT,