| 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 | __u32 ctx_retval_value = 0; |
| 15 | __u32 page_size = 0; |
| 16 | |
| 17 | SEC("cgroup/getsockopt") |
| 18 | int get_retval(struct bpf_sockopt *ctx) |
| 19 | { |
| 20 | retval_value = bpf_get_retval(); |
| 21 | ctx_retval_value = ctx->retval; |
| 22 | __sync_fetch_and_add(&invocations, 1); |
| 23 | |
| 24 | /* optval larger than PAGE_SIZE use kernel's buffer. */ |
| 25 | if (ctx->optlen > page_size) |
| 26 | ctx->optlen = 0; |
| 27 | |
| 28 | return 1; |
| 29 | } |
| 30 | |
| 31 | SEC("cgroup/getsockopt") |
| 32 | int set_eisconn(struct bpf_sockopt *ctx) |
| 33 | { |
| 34 | __sync_fetch_and_add(&invocations, 1); |
| 35 | |
| 36 | if (bpf_set_retval(-EISCONN)) |
| 37 | assertion_error = 1; |
| 38 | |
| 39 | /* optval larger than PAGE_SIZE use kernel's buffer. */ |
| 40 | if (ctx->optlen > page_size) |
| 41 | ctx->optlen = 0; |
| 42 | |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | SEC("cgroup/getsockopt") |
| 47 | int clear_retval(struct bpf_sockopt *ctx) |
| 48 | { |
| 49 | __sync_fetch_and_add(&invocations, 1); |
| 50 | |
| 51 | ctx->retval = 0; |
| 52 | |
| 53 | /* optval larger than PAGE_SIZE use kernel's buffer. */ |
| 54 | if (ctx->optlen > page_size) |
| 55 | ctx->optlen = 0; |
| 56 | |
| 57 | return 1; |
| 58 | } |
| 59 |