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 .wire_len = 100, 15 .gso_segs = 8, 16 }; 17 struct bpf_prog_test_run_attr tattr = { 18 .data_in = &pkt_v4, 19 .data_size_in = sizeof(pkt_v4), 20 .ctx_in = &skb, 21 .ctx_size_in = sizeof(skb), 22 .ctx_out = &skb, 23 .ctx_size_out = sizeof(skb), 24 }; 25 struct bpf_object *obj; 26 int err; 27 int i; 28 29 err = bpf_prog_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj, 30 &tattr.prog_fd); 31 if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno)) 32 return; 33 34 /* ctx_in != NULL, ctx_size_in == 0 */ 35 36 tattr.ctx_size_in = 0; 37 err = bpf_prog_test_run_xattr(&tattr); 38 CHECK_ATTR(err == 0, "ctx_size_in", "err %d errno %d\n", err, errno); 39 tattr.ctx_size_in = sizeof(skb); 40 41 /* ctx_out != NULL, ctx_size_out == 0 */ 42 43 tattr.ctx_size_out = 0; 44 err = bpf_prog_test_run_xattr(&tattr); 45 CHECK_ATTR(err == 0, "ctx_size_out", "err %d errno %d\n", err, errno); 46 tattr.ctx_size_out = sizeof(skb); 47 48 /* non-zero [len, tc_index] fields should be rejected*/ 49 50 skb.len = 1; 51 err = bpf_prog_test_run_xattr(&tattr); 52 CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno); 53 skb.len = 0; 54 55 skb.tc_index = 1; 56 err = bpf_prog_test_run_xattr(&tattr); 57 CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno); 58 skb.tc_index = 0; 59 60 /* non-zero [hash, sk] fields should be rejected */ 61 62 skb.hash = 1; 63 err = bpf_prog_test_run_xattr(&tattr); 64 CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno); 65 skb.hash = 0; 66 67 skb.sk = (struct bpf_sock *)1; 68 err = bpf_prog_test_run_xattr(&tattr); 69 CHECK_ATTR(err == 0, "sk", "err %d errno %d\n", err, errno); 70 skb.sk = 0; 71 72 err = bpf_prog_test_run_xattr(&tattr); 73 CHECK_ATTR(err != 0 || tattr.retval, 74 "run", 75 "err %d errno %d retval %d\n", 76 err, errno, tattr.retval); 77 78 CHECK_ATTR(tattr.ctx_size_out != sizeof(skb), 79 "ctx_size_out", 80 "incorrect output size, want %lu have %u\n", 81 sizeof(skb), tattr.ctx_size_out); 82 83 for (i = 0; i < 5; i++) 84 CHECK_ATTR(skb.cb[i] != i + 2, 85 "ctx_out_cb", 86 "skb->cb[i] == %d, expected %d\n", 87 skb.cb[i], i + 2); 88 CHECK_ATTR(skb.priority != 7, 89 "ctx_out_priority", 90 "skb->priority == %d, expected %d\n", 91 skb.priority, 7); 92 CHECK_ATTR(skb.tstamp != 8, 93 "ctx_out_tstamp", 94 "skb->tstamp == %lld, expected %d\n", 95 skb.tstamp, 8); 96 } 97