diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/getsockname_unix_prog.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/getsockname_unix_prog.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/getsockname_unix_prog.c b/tools/testing/selftests/bpf/progs/getsockname_unix_prog.c new file mode 100644 index 0000000000..ac71451114 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/getsockname_unix_prog.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ + +#include "vmlinux.h" + +#include <string.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_core_read.h> +#include "bpf_kfuncs.h" + +__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite"; + +SEC("cgroup/getsockname_unix") +int getsockname_unix_prog(struct bpf_sock_addr *ctx) +{ + struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx); + struct sockaddr_un *sa_kern_unaddr; + __u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) + + sizeof(SERVUN_REWRITE_ADDRESS) - 1; + int ret; + + ret = bpf_sock_addr_set_sun_path(sa_kern, SERVUN_REWRITE_ADDRESS, + sizeof(SERVUN_REWRITE_ADDRESS) - 1); + if (ret) + return 1; + + if (sa_kern->uaddrlen != unaddrlen) + return 1; + + sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr, + bpf_core_type_id_kernel(struct sockaddr_un)); + if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS, + sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0) + return 1; + + return 1; +} + +char _license[] SEC("license") = "GPL"; |