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examples/bpf/bpf_shared.c
53 строки
1 KB
Hangbin Liu
examples/bpf: add bpf examples with BTF defined maps
25 ноя 2020, 08:14
25 ноя 2020, 08:14
71c7c1f
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#include "../../include/bpf_api.h" /* Minimal, stand-alone toy map pinning example: * * clang -target bpf -O2 [...] -o bpf_shared.o -c bpf_shared.c * tc filter add dev foo parent 1: bpf obj bpf_shared.o sec egress * tc filter add dev foo parent ffff: bpf obj bpf_shared.o sec ingress * * Both classifier will share the very same map instance in this example, * so map content can be accessed from ingress *and* egress side! * * This example has a pinning of PIN_OBJECT_NS, so it's private and * thus shared among various program sections within the object. * * A setting of PIN_GLOBAL_NS would place it into a global namespace, * so that it can be shared among different object files. A setting * of PIN_NONE (= 0) means no sharing, so each tc invocation a new map * instance is being created. */ struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(key_size, sizeof(uint32_t)); __uint(value_size, sizeof(uint32_t)); __uint(max_entries, 1); __uint(pinning, LIBBPF_PIN_BY_NAME); /* or LIBBPF_PIN_NONE */ } map_sh __section(".maps"); __section("egress") int emain(struct __sk_buff *skb) { int key = 0, *val; val = map_lookup_elem(&map_sh, &key); if (val) lock_xadd(val, 1); return BPF_H_DEFAULT; } __section("ingress") int imain(struct __sk_buff *skb) { int key = 0, *val; val = map_lookup_elem(&map_sh, &key); if (val) printt("map val: %d\n", *val); return BPF_H_DEFAULT; } BPF_LICENSE("GPL");