[PATCH net-next 4/4] samples/bpf: add erspan v2 sample code

William Tu
2017-12-14T00:39:18Z

Extend the existing tests for ipv4 ipv6 erspan version 2.

Signed-off-by: William Tu <u9012063@gmail.com>
---
samples/bpf/tcbpf2_kern.c | 77 +++++++++++++++++++++++++++++++++++++-----
samples/bpf/test_tunnel_bpf.sh | 38 +++++++++++++++------
2 files changed, 96 insertions(+), 19 deletions(-)

diff --git a/samples/bpf/tcbpf2_kern.c b/samples/bpf/tcbpf2_kern.c
index 79ad061079dd..f6bbf8f50da3 100644
--- a/samples/bpf/tcbpf2_kern.c
+++ b/samples/bpf/tcbpf2_kern.c
@@ -35,12 +35,22 @@ struct geneve_opt {
u8 opt_data[8]; /* hard-coded to 8 byte */
};

+struct erspan_md2 {
+ __be32 timestamp;
+ __be16 sgt;
+ __be16 flags;
+};
+
struct vxlan_metadata {
u32 gbp;
};

struct erspan_metadata {
- __be32 index;
+ union {
+ __be32 index;
+ struct erspan_md2 md2;
+ } u;
+ int version;
};

SEC("gre_set_tunnel")
@@ -143,7 +153,18 @@ int _erspan_set_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}

- md.index = htonl(123);
+ __builtin_memset(&md, 0, sizeof(md));
+#ifdef ERSPAN_V1
+ md.version = 1;
+ md.u.index = htonl(123);
+#else
+ u8 direction = 1;
+ u16 hwid = 7;
+
+ md.version = 2;
+ md.u.md2.flags = htons((direction << 3) | (hwid << 4));
+#endif
+
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
ERROR(ret);
@@ -156,7 +177,7 @@ int _erspan_set_tunnel(struct __sk_buff *skb)
SEC("erspan_get_tunnel")
int _erspan_get_tunnel(struct __sk_buff *skb)
{
- char fmt[] = "key %d remote ip 0x%x erspan index 0x%x\n";
+ char fmt[] = "key %d remote ip 0x%x erspan version %d\n";
struct bpf_tunnel_key key;
struct erspan_metadata md;
u32 index;
@@ -174,9 +195,22 @@ int _erspan_get_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}

- index = bpf_ntohl(md.index);
bpf_trace_printk(fmt, sizeof(fmt),
- key.tunnel_id, key.remote_ipv4, index);
+ key.tunnel_id, key.remote_ipv4, md.version);
+
+#ifdef ERSPAN_V1
+ char fmt2[] = "\tindex %x\n";
+
+ index = bpf_ntohl(md.u.index);
+ bpf_trace_printk(fmt2, sizeof(fmt2), index);
+#else
+ char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";
+
+ bpf_trace_printk(fmt2, sizeof(fmt2),
+ (ntohs(md.u.md2.flags) >> 3) & 0x1,
+ (ntohs(md.u.md2.flags) >> 4) & 0x3f,
+ bpf_ntohl(md.u.md2.timestamp));
+#endif

return TC_ACT_OK;
}
@@ -201,7 +235,19 @@ int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}

- md.index = htonl(123);
+ __builtin_memset(&md, 0, sizeof(md));
+
+#ifdef ERSPAN_V1
+ md.u.index = htonl(123);
+ md.version = 1;
+#else
+ u8 direction = 0;
+ u16 hwid = 17;
+
+ md.version = 2;
+ md.u.md2.flags = htons((direction << 3) | (hwid << 4));
+#endif
+
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
ERROR(ret);
@@ -214,7 +260,7 @@ int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb)
SEC("ip4ip6erspan_get_tunnel")
int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
{
- char fmt[] = "key %d remote ip6 ::%x erspan index 0x%x\n";
+ char fmt[] = "ip6erspan get key %d remote ip6 ::%x erspan version %d\n";
struct bpf_tunnel_key key;
struct erspan_metadata md;
u32 index;
@@ -232,9 +278,22 @@ int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}

- index = bpf_ntohl(md.index);
bpf_trace_printk(fmt, sizeof(fmt),
- key.tunnel_id, key.remote_ipv6[0], index);
+ key.tunnel_id, key.remote_ipv4, md.version);
+
+#ifdef ERSPAN_V1
+ char fmt2[] = "\tindex %x\n";
+
+ index = bpf_ntohl(md.u.index);
+ bpf_trace_printk(fmt2, sizeof(fmt2), index);
+#else
+ char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";
+
+ bpf_trace_printk(fmt2, sizeof(fmt2),
+ (ntohs(md.u.md2.flags) >> 3) & 0x1,
+ (ntohs(md.u.md2.flags) >> 4) & 0x3f,
+ bpf_ntohl(md.u.md2.timestamp));
+#endif

return TC_ACT_OK;
}
diff --git a/samples/bpf/test_tunnel_bpf.sh b/samples/bpf/test_tunnel_bpf.sh
index f53efb62f699..ae7f7c38309b 100755
--- a/samples/bpf/test_tunnel_bpf.sh
+++ b/samples/bpf/test_tunnel_bpf.sh
@@ -59,8 +59,17 @@ function add_ip6gretap_tunnel {

function add_erspan_tunnel {
# in namespace
- ip netns exec at_ns0 \
- ip link add dev $DEV_NS type $TYPE seq key 2 local 172.16.1.100 remote 172.16.1.200 erspan 123
+ if [ "$1" == "v1" ]; then
+ ip netns exec at_ns0 \
+ ip link add dev $DEV_NS type $TYPE seq key 2 \
+ local 172.16.1.100 remote 172.16.1.200 \
+ erspan_ver 1 erspan 123
+ else
+ ip netns exec at_ns0 \
+ ip link add dev $DEV_NS type $TYPE seq key 2 \
+ local 172.16.1.100 remote 172.16.1.200 \
+ erspan_ver 2 erspan_dir 1 erspan_hwid 3
+ fi
ip netns exec at_ns0 ip link set dev $DEV_NS up
ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24

@@ -79,10 +88,17 @@ function add_ip6erspan_tunnel {
ip link set dev veth1 up

# in namespace
- ip netns exec at_ns0 \
- ip link add dev $DEV_NS type $TYPE seq key 2 erspan 123 \
- local ::11 remote ::22
-
+ if [ "$1" == "v1" ]; then
+ ip netns exec at_ns0 \
+ ip link add dev $DEV_NS type $TYPE seq key 2 \
+ local ::11 remote ::22 \
+ erspan_ver 1 erspan 123
+ else
+ ip netns exec at_ns0 \
+ ip link add dev $DEV_NS type $TYPE seq key 2 \
+ local ::11 remote ::22 \
+ erspan_ver 2 erspan_dir 1 erspan_hwid 7
+ fi
ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
ip netns exec at_ns0 ip link set dev $DEV_NS up

@@ -199,7 +215,7 @@ function test_erspan {
DEV_NS=erspan00
DEV=erspan11
config_device
- add_erspan_tunnel
+ add_erspan_tunnel $1
attach_bpf $DEV erspan_set_tunnel erspan_get_tunnel
ping -c 1 10.1.1.100
ip netns exec at_ns0 ping -c 1 10.1.1.200
@@ -211,7 +227,7 @@ function test_ip6erspan {
DEV_NS=ip6erspan00
DEV=ip6erspan11
config_device
- add_ip6erspan_tunnel
+ add_ip6erspan_tunnel $1
attach_bpf $DEV ip4ip6erspan_set_tunnel ip4ip6erspan_get_tunnel
ping6 -c 3 ::11
ip netns exec at_ns0 ping -c 1 10.1.1.200
@@ -288,9 +304,11 @@ test_ip6gre
echo "Testing IP6GRETAP tunnel..."
test_ip6gretap
echo "Testing ERSPAN tunnel..."
-test_erspan
+test_erspan v1
+test_erspan v2
echo "Testing IP6ERSPAN tunnel..."
-test_ip6erspan
+test_ip6erspan v1
+test_ip6erspan v2
echo "Testing VXLAN tunnel..."
test_vxlan
echo "Testing GENEVE tunnel..."
--
2.7.4