1// SPDX-License-Identifier: GPL-2.0-only 2 3/* 4 * Copyright 2021 Google LLC. 5 */ 6 7#include <errno.h> 8#include <linux/bpf.h> 9#include <bpf/bpf_helpers.h> 10 11__u32 invocations = 0; 12__u32 assertion_error = 0; 13__u32 retval_value = 0; 14__s32 page_size = 0; 15 16SEC("cgroup/setsockopt") 17int get_retval(struct bpf_sockopt *ctx) 18{ 19 retval_value = bpf_get_retval(); 20 __sync_fetch_and_add(&invocations, 1); 21 22 /* optval larger than PAGE_SIZE use kernel's buffer. */ 23 if (ctx->optlen > page_size) 24 ctx->optlen = 0; 25 26 return 1; 27} 28 29SEC("cgroup/setsockopt") 30int set_eunatch(struct bpf_sockopt *ctx) 31{ 32 __sync_fetch_and_add(&invocations, 1); 33 34 if (bpf_set_retval(-EUNATCH)) 35 assertion_error = 1; 36 37 /* optval larger than PAGE_SIZE use kernel's buffer. */ 38 if (ctx->optlen > page_size) 39 ctx->optlen = 0; 40 41 return 0; 42} 43 44SEC("cgroup/setsockopt") 45int set_eisconn(struct bpf_sockopt *ctx) 46{ 47 __sync_fetch_and_add(&invocations, 1); 48 49 if (bpf_set_retval(-EISCONN)) 50 assertion_error = 1; 51 52 /* optval larger than PAGE_SIZE use kernel's buffer. */ 53 if (ctx->optlen > page_size) 54 ctx->optlen = 0; 55 56 return 0; 57} 58 59SEC("cgroup/setsockopt") 60int legacy_eperm(struct bpf_sockopt *ctx) 61{ 62 __sync_fetch_and_add(&invocations, 1); 63 64 /* optval larger than PAGE_SIZE use kernel's buffer. */ 65 if (ctx->optlen > page_size) 66 ctx->optlen = 0; 67 68 return 0; 69} 70