1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 4 void test_skb_ctx(void) 5 { 6 struct __sk_buff skb = { 7 .cb[0] = 1, 8 .cb[1] = 2, 9 .cb[2] = 3, 10 .cb[3] = 4, 11 .cb[4] = 5, 12 .priority = 6, 13 .tstamp = 7, 14 }; 15 struct bpf_prog_test_run_attr tattr = { 16 .data_in = &pkt_v4, 17 .data_size_in = sizeof(pkt_v4), 18 .ctx_in = &skb, 19 .ctx_size_in = sizeof(skb), 20 .ctx_out = &skb, 21 .ctx_size_out = sizeof(skb), 22 }; 23 struct bpf_object *obj; 24 int err; 25 int i; 26 27 err = bpf_prog_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj, 28 &tattr.prog_fd); 29 if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno)) 30 return; 31 32 /* ctx_in != NULL, ctx_size_in == 0 */ 33 34 tattr.ctx_size_in = 0; 35 err = bpf_prog_test_run_xattr(&tattr); 36 CHECK_ATTR(err == 0, "ctx_size_in", "err %d errno %d\n", err, errno); 37 tattr.ctx_size_in = sizeof(skb); 38 39 /* ctx_out != NULL, ctx_size_out == 0 */ 40 41 tattr.ctx_size_out = 0; 42 err = bpf_prog_test_run_xattr(&tattr); 43 CHECK_ATTR(err == 0, "ctx_size_out", "err %d errno %d\n", err, errno); 44 tattr.ctx_size_out = sizeof(skb); 45 46 /* non-zero [len, tc_index] fields should be rejected*/ 47 48 skb.len = 1; 49 err = bpf_prog_test_run_xattr(&tattr); 50 CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno); 51 skb.len = 0; 52 53 skb.tc_index = 1; 54 err = bpf_prog_test_run_xattr(&tattr); 55 CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno); 56 skb.tc_index = 0; 57 58 /* non-zero [hash, sk] fields should be rejected */ 59 60 skb.hash = 1; 61 err = bpf_prog_test_run_xattr(&tattr); 62 CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno); 63 skb.hash = 0; 64 65 skb.sk = (struct bpf_sock *)1; 66 err = bpf_prog_test_run_xattr(&tattr); 67 CHECK_ATTR(err == 0, "sk", "err %d errno %d\n", err, errno); 68 skb.sk = 0; 69 70 err = bpf_prog_test_run_xattr(&tattr); 71 CHECK_ATTR(err != 0 || tattr.retval, 72 "run", 73 "err %d errno %d retval %d\n", 74 err, errno, tattr.retval); 75 76 CHECK_ATTR(tattr.ctx_size_out != sizeof(skb), 77 "ctx_size_out", 78 "incorrect output size, want %lu have %u\n", 79 sizeof(skb), tattr.ctx_size_out); 80 81 for (i = 0; i < 5; i++) 82 CHECK_ATTR(skb.cb[i] != i + 2, 83 "ctx_out_cb", 84 "skb->cb[i] == %d, expected %d\n", 85 skb.cb[i], i + 2); 86 CHECK_ATTR(skb.priority != 7, 87 "ctx_out_priority", 88 "skb->priority == %d, expected %d\n", 89 skb.priority, 7); 90 CHECK_ATTR(skb.tstamp != 8, 91 "ctx_out_tstamp", 92 "skb->tstamp == %lld, expected %d\n", 93 skb.tstamp, 8); 94 } 95