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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /samples/bpf/sockex1_kern.c
Initial import
Diffstat (limited to 'samples/bpf/sockex1_kern.c')
-rw-r--r--samples/bpf/sockex1_kern.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/samples/bpf/sockex1_kern.c b/samples/bpf/sockex1_kern.c
new file mode 100644
index 000000000..ed18e9a49
--- /dev/null
+++ b/samples/bpf/sockex1_kern.c
@@ -0,0 +1,29 @@
+#include <uapi/linux/bpf.h>
+#include <uapi/linux/if_ether.h>
+#include <uapi/linux/if_packet.h>
+#include <uapi/linux/ip.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") my_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(u32),
+ .value_size = sizeof(long),
+ .max_entries = 256,
+};
+
+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";