1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include <network_helpers.h> 4 5 void test_skb_ctx(void) 6 { 7 struct __sk_buff skb = { 8 .cb[0] = 1, 9 .cb[1] = 2, 10 .cb[2] = 3, 11 .cb[3] = 4, 12 .cb[4] = 5, 13 .priority = 6, 14 .ingress_ifindex = 11, 15 .ifindex = 1, 16 .tstamp = 7, 17 .wire_len = 100, 18 .gso_segs = 8, 19 .mark = 9, 20 .gso_size = 10, 21 .hwtstamp = 11, 22 }; 23 struct bpf_prog_test_run_attr tattr = { 24 .data_in = &pkt_v4, 25 .data_size_in = sizeof(pkt_v4), 26 .ctx_in = &skb, 27 .ctx_size_in = sizeof(skb), 28 .ctx_out = &skb, 29 .ctx_size_out = sizeof(skb), 30 }; 31 struct bpf_object *obj; 32 int err; 33 int i; 34 35 err = bpf_prog_test_load("./test_skb_ctx.o", BPF_PROG_TYPE_SCHED_CLS, &obj, 36 &tattr.prog_fd); 37 if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno)) 38 return; 39 40 /* ctx_in != NULL, ctx_size_in == 0 */ 41 42 tattr.ctx_size_in = 0; 43 err = bpf_prog_test_run_xattr(&tattr); 44 CHECK_ATTR(err == 0, "ctx_size_in", "err %d errno %d\n", err, errno); 45 tattr.ctx_size_in = sizeof(skb); 46 47 /* ctx_out != NULL, ctx_size_out == 0 */ 48 49 tattr.ctx_size_out = 0; 50 err = bpf_prog_test_run_xattr(&tattr); 51 CHECK_ATTR(err == 0, "ctx_size_out", "err %d errno %d\n", err, errno); 52 tattr.ctx_size_out = sizeof(skb); 53 54 /* non-zero [len, tc_index] fields should be rejected*/ 55 56 skb.len = 1; 57 err = bpf_prog_test_run_xattr(&tattr); 58 CHECK_ATTR(err == 0, "len", "err %d errno %d\n", err, errno); 59 skb.len = 0; 60 61 skb.tc_index = 1; 62 err = bpf_prog_test_run_xattr(&tattr); 63 CHECK_ATTR(err == 0, "tc_index", "err %d errno %d\n", err, errno); 64 skb.tc_index = 0; 65 66 /* non-zero [hash, sk] fields should be rejected */ 67 68 skb.hash = 1; 69 err = bpf_prog_test_run_xattr(&tattr); 70 CHECK_ATTR(err == 0, "hash", "err %d errno %d\n", err, errno); 71 skb.hash = 0; 72 73 skb.sk = (struct bpf_sock *)1; 74 err = bpf_prog_test_run_xattr(&tattr); 75 CHECK_ATTR(err == 0, "sk", "err %d errno %d\n", err, errno); 76 skb.sk = 0; 77 78 err = bpf_prog_test_run_xattr(&tattr); 79 CHECK_ATTR(err != 0 || tattr.retval, 80 "run", 81 "err %d errno %d retval %d\n", 82 err, errno, tattr.retval); 83 84 CHECK_ATTR(tattr.ctx_size_out != sizeof(skb), 85 "ctx_size_out", 86 "incorrect output size, want %zu have %u\n", 87 sizeof(skb), tattr.ctx_size_out); 88 89 for (i = 0; i < 5; i++) 90 CHECK_ATTR(skb.cb[i] != i + 2, 91 "ctx_out_cb", 92 "skb->cb[i] == %d, expected %d\n", 93 skb.cb[i], i + 2); 94 CHECK_ATTR(skb.priority != 7, 95 "ctx_out_priority", 96 "skb->priority == %d, expected %d\n", 97 skb.priority, 7); 98 CHECK_ATTR(skb.ifindex != 1, 99 "ctx_out_ifindex", 100 "skb->ifindex == %d, expected %d\n", 101 skb.ifindex, 1); 102 CHECK_ATTR(skb.ingress_ifindex != 11, 103 "ctx_out_ingress_ifindex", 104 "skb->ingress_ifindex == %d, expected %d\n", 105 skb.ingress_ifindex, 11); 106 CHECK_ATTR(skb.tstamp != 8, 107 "ctx_out_tstamp", 108 "skb->tstamp == %lld, expected %d\n", 109 skb.tstamp, 8); 110 CHECK_ATTR(skb.mark != 10, 111 "ctx_out_mark", 112 "skb->mark == %u, expected %d\n", 113 skb.mark, 10); 114 115 bpf_object__close(obj); 116 } 117