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612ff099a1
Add support for map in map in the loader and add a small example program. The outer map uses inner_id to reference a bpf_elf_map with a given ID as the inner type. Loading maps is done in three passes, i) all non-map in map maps are loaded, ii) all map in map maps are loaded based on the inner_id map spec of a non-map in map with corresponding id, and iii) related inner maps are attached to the map in map with given inner_idx key. Pinned objetcs are assumed to be managed externally, so they are only retrieved from BPF fs. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
#include "../../include/bpf_api.h"
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#define MAP_INNER_ID 42
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struct bpf_elf_map __section_maps map_inner = {
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.type = BPF_MAP_TYPE_ARRAY,
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.size_key = sizeof(uint32_t),
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.size_value = sizeof(uint32_t),
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.id = MAP_INNER_ID,
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.inner_idx = 0,
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.pinning = PIN_GLOBAL_NS,
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.max_elem = 1,
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};
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struct bpf_elf_map __section_maps map_outer = {
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.type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
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.size_key = sizeof(uint32_t),
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.size_value = sizeof(uint32_t),
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.inner_id = MAP_INNER_ID,
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.pinning = PIN_GLOBAL_NS,
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.max_elem = 1,
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};
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__section("egress")
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int emain(struct __sk_buff *skb)
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{
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struct bpf_elf_map *map_inner;
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int key = 0, *val;
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map_inner = map_lookup_elem(&map_outer, &key);
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if (map_inner) {
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val = map_lookup_elem(map_inner, &key);
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if (val)
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lock_xadd(val, 1);
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}
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return BPF_H_DEFAULT;
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}
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__section("ingress")
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int imain(struct __sk_buff *skb)
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{
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struct bpf_elf_map *map_inner;
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int key = 0, *val;
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map_inner = map_lookup_elem(&map_outer, &key);
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if (map_inner) {
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val = map_lookup_elem(map_inner, &key);
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if (val)
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printt("map val: %d\n", *val);
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}
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return BPF_H_DEFAULT;
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}
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BPF_LICENSE("GPL");
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