// 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; __u32 ctx_retval_value = 0; __u32 page_size = 0; SEC("cgroup/getsockopt") int get_retval(struct bpf_sockopt *ctx) { retval_value = bpf_get_retval(); ctx_retval_value = ctx->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/getsockopt") 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 1; } SEC("cgroup/getsockopt") int clear_retval(struct bpf_sockopt *ctx) { __sync_fetch_and_add(&invocations, 1); ctx->retval = 0; /* optval larger than PAGE_SIZE use kernel's buffer. */ if (ctx->optlen > page_size) ctx->optlen = 0; return 1; }