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-rw-r--r--samples/bpf/sockex1_kern.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/samples/bpf/sockex1_kern.c b/samples/bpf/sockex1_kern.c
new file mode 100644
index 0000000000..431c956460
--- /dev/null
+++ b/samples/bpf/sockex1_kern.c
@@ -0,0 +1,30 @@
+#include <uapi/linux/bpf.h>
+#include <uapi/linux/if_ether.h>
+#include <uapi/linux/if_packet.h>
+#include <uapi/linux/ip.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_legacy.h"
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, u32);
+ __type(value, long);
+ __uint(max_entries, 256);
+} my_map SEC(".maps");
+
+SEC("socket1")
+int bpf_prog1(struct __sk_buff *skb)
+{
+ int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
+ long *value;
+
+ if (skb->pkt_type != PACKET_OUTGOING)
+ return 0;
+
+ value = bpf_map_lookup_elem(&my_map, &index);
+ if (value)
+ __sync_fetch_and_add(value, skb->len);
+
+ return 0;
+}
+char _license[] SEC("license") = "GPL";