diff options
Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/bpf/progs/udp_limit.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/udp_limit.c b/tools/testing/selftests/bpf/progs/udp_limit.c new file mode 100644 index 000000000..165e3c2dd --- /dev/null +++ b/tools/testing/selftests/bpf/progs/udp_limit.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <sys/socket.h> +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> + +int invocations = 0, in_use = 0; + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, int); +} sk_map SEC(".maps"); + +SEC("cgroup/sock_create") +int sock(struct bpf_sock *ctx) +{ + int *sk_storage; + __u32 key; + + if (ctx->type != SOCK_DGRAM) + return 1; + + sk_storage = bpf_sk_storage_get(&sk_map, ctx, 0, + BPF_SK_STORAGE_GET_F_CREATE); + if (!sk_storage) + return 0; + *sk_storage = 0xdeadbeef; + + __sync_fetch_and_add(&invocations, 1); + + if (in_use > 0) { + /* BPF_CGROUP_INET_SOCK_RELEASE is _not_ called + * when we return an error from the BPF + * program! + */ + return 0; + } + + __sync_fetch_and_add(&in_use, 1); + return 1; +} + +SEC("cgroup/sock_release") +int sock_release(struct bpf_sock *ctx) +{ + int *sk_storage; + __u32 key; + + if (ctx->type != SOCK_DGRAM) + return 1; + + sk_storage = bpf_sk_storage_get(&sk_map, ctx, 0, 0); + if (!sk_storage || *sk_storage != 0xdeadbeef) + return 0; + + __sync_fetch_and_add(&invocations, 1); + __sync_fetch_and_add(&in_use, -1); + return 1; +} |