summaryrefslogtreecommitdiffstats
path: root/examples/bpf/legacy/bpf_map_in_map.c
diff options
context:
space:
mode:
Diffstat (limited to 'examples/bpf/legacy/bpf_map_in_map.c')
-rw-r--r--examples/bpf/legacy/bpf_map_in_map.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/examples/bpf/legacy/bpf_map_in_map.c b/examples/bpf/legacy/bpf_map_in_map.c
new file mode 100644
index 0000000..575f881
--- /dev/null
+++ b/examples/bpf/legacy/bpf_map_in_map.c
@@ -0,0 +1,56 @@
+#include "../../../include/bpf_api.h"
+
+#define MAP_INNER_ID 42
+
+struct bpf_elf_map __section_maps map_inner = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .size_key = sizeof(uint32_t),
+ .size_value = sizeof(uint32_t),
+ .id = MAP_INNER_ID,
+ .inner_idx = 0,
+ .pinning = PIN_GLOBAL_NS,
+ .max_elem = 1,
+};
+
+struct bpf_elf_map __section_maps map_outer = {
+ .type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
+ .size_key = sizeof(uint32_t),
+ .size_value = sizeof(uint32_t),
+ .inner_id = MAP_INNER_ID,
+ .pinning = PIN_GLOBAL_NS,
+ .max_elem = 1,
+};
+
+__section("egress")
+int emain(struct __sk_buff *skb)
+{
+ struct bpf_elf_map *map_inner;
+ int key = 0, *val;
+
+ map_inner = map_lookup_elem(&map_outer, &key);
+ if (map_inner) {
+ val = map_lookup_elem(map_inner, &key);
+ if (val)
+ lock_xadd(val, 1);
+ }
+
+ return BPF_H_DEFAULT;
+}
+
+__section("ingress")
+int imain(struct __sk_buff *skb)
+{
+ struct bpf_elf_map *map_inner;
+ int key = 0, *val;
+
+ map_inner = map_lookup_elem(&map_outer, &key);
+ if (map_inner) {
+ val = map_lookup_elem(map_inner, &key);
+ if (val)
+ printt("map val: %d\n", *val);
+ }
+
+ return BPF_H_DEFAULT;
+}
+
+BPF_LICENSE("GPL");