diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/bind_perm.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/bind_perm.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/bind_perm.c b/tools/testing/selftests/bpf/progs/bind_perm.c new file mode 100644 index 0000000000..7bd2a02702 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/bind_perm.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/stddef.h> +#include <linux/bpf.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_endian.h> + +static __always_inline int bind_prog(struct bpf_sock_addr *ctx, int family) +{ + struct bpf_sock *sk; + + sk = ctx->sk; + if (!sk) + return 0; + + if (sk->family != family) + return 0; + + if (ctx->type != SOCK_STREAM) + return 0; + + /* Return 1 OR'ed with the first bit set to indicate + * that CAP_NET_BIND_SERVICE should be bypassed. + */ + if (ctx->user_port == bpf_htons(111)) + return (1 | 2); + + return 1; +} + +SEC("cgroup/bind4") +int bind_v4_prog(struct bpf_sock_addr *ctx) +{ + return bind_prog(ctx, AF_INET); +} + +SEC("cgroup/bind6") +int bind_v6_prog(struct bpf_sock_addr *ctx) +{ + return bind_prog(ctx, AF_INET6); +} + +char _license[] SEC("license") = "GPL"; |