// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2021 Google LLC. */ #include <errno.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> __u32 invocations = 0; __u32 assertion_error = 0; __u32 retval_value = 0; __s32 page_size = 0; SEC("cgroup/setsockopt") int get_retval(struct bpf_sockopt *ctx) { retval_value = bpf_get_retval(); __sync_fetch_and_add(&invocations, 1); /* optval larger than PAGE_SIZE use kernel's buffer. */ if (ctx->optlen > page_size) ctx->optlen = 0; return 1; } SEC("cgroup/setsockopt") int set_eunatch(struct bpf_sockopt *ctx) { __sync_fetch_and_add(&invocations, 1); if (bpf_set_retval(-EUNATCH)) assertion_error = 1; /* optval larger than PAGE_SIZE use kernel's buffer. */ if (ctx->optlen > page_size) ctx->optlen = 0; return 0; } SEC("cgroup/setsockopt") int set_eisconn(struct bpf_sockopt *ctx) { __sync_fetch_and_add(&invocations, 1); if (bpf_set_retval(-EISCONN)) assertion_error = 1; /* optval larger than PAGE_SIZE use kernel's buffer. */ if (ctx->optlen > page_size) ctx->optlen = 0; return 0; } SEC("cgroup/setsockopt") int legacy_eperm(struct bpf_sockopt *ctx) { __sync_fetch_and_add(&invocations, 1); /* optval larger than PAGE_SIZE use kernel's buffer. */ if (ctx->optlen > page_size) ctx->optlen = 0; return 0; }