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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/progs/sockopt_inherit.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/sockopt_inherit.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/sockopt_inherit.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/sockopt_inherit.c b/tools/testing/selftests/bpf/progs/sockopt_inherit.c new file mode 100644 index 000000000..c6d428a8d --- /dev/null +++ b/tools/testing/selftests/bpf/progs/sockopt_inherit.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> + +char _license[] SEC("license") = "GPL"; +__u32 _version SEC("version") = 1; + +#define SOL_CUSTOM 0xdeadbeef +#define CUSTOM_INHERIT1 0 +#define CUSTOM_INHERIT2 1 +#define CUSTOM_LISTENER 2 + +struct sockopt_inherit { + __u8 val; +}; + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC | BPF_F_CLONE); + __type(key, int); + __type(value, struct sockopt_inherit); +} cloned1_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC | BPF_F_CLONE); + __type(key, int); + __type(value, struct sockopt_inherit); +} cloned2_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct sockopt_inherit); +} listener_only_map SEC(".maps"); + +static __inline struct sockopt_inherit *get_storage(struct bpf_sockopt *ctx) +{ + if (ctx->optname == CUSTOM_INHERIT1) + return bpf_sk_storage_get(&cloned1_map, ctx->sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + else if (ctx->optname == CUSTOM_INHERIT2) + return bpf_sk_storage_get(&cloned2_map, ctx->sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + else + return bpf_sk_storage_get(&listener_only_map, ctx->sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); +} + +SEC("cgroup/getsockopt") +int _getsockopt(struct bpf_sockopt *ctx) +{ + __u8 *optval_end = ctx->optval_end; + struct sockopt_inherit *storage; + __u8 *optval = ctx->optval; + + if (ctx->level != SOL_CUSTOM) + return 1; /* only interested in SOL_CUSTOM */ + + if (optval + 1 > optval_end) + return 0; /* EPERM, bounds check */ + + storage = get_storage(ctx); + if (!storage) + return 0; /* EPERM, couldn't get sk storage */ + + ctx->retval = 0; /* Reset system call return value to zero */ + + optval[0] = storage->val; + ctx->optlen = 1; + + return 1; +} + +SEC("cgroup/setsockopt") +int _setsockopt(struct bpf_sockopt *ctx) +{ + __u8 *optval_end = ctx->optval_end; + struct sockopt_inherit *storage; + __u8 *optval = ctx->optval; + + if (ctx->level != SOL_CUSTOM) + return 1; /* only interested in SOL_CUSTOM */ + + if (optval + 1 > optval_end) + return 0; /* EPERM, bounds check */ + + storage = get_storage(ctx); + if (!storage) + return 0; /* EPERM, couldn't get sk storage */ + + storage->val = optval[0]; + ctx->optlen = -1; + + return 1; +} |