1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include <network_helpers.h> 4 5 static void test_xdp_adjust_tail_shrink(void) 6 { 7 const char *file = "./test_xdp_adjust_tail_shrink.bpf.o"; 8 __u32 expect_sz; 9 struct bpf_object *obj; 10 int err, prog_fd; 11 char buf[128]; 12 LIBBPF_OPTS(bpf_test_run_opts, topts, 13 .data_in = &pkt_v4, 14 .data_size_in = sizeof(pkt_v4), 15 .data_out = buf, 16 .data_size_out = sizeof(buf), 17 .repeat = 1, 18 ); 19 20 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); 21 if (!ASSERT_OK(err, "test_xdp_adjust_tail_shrink")) 22 return; 23 24 err = bpf_prog_test_run_opts(prog_fd, &topts); 25 ASSERT_OK(err, "ipv4"); 26 ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval"); 27 28 expect_sz = sizeof(pkt_v6) - 20; /* Test shrink with 20 bytes */ 29 topts.data_in = &pkt_v6; 30 topts.data_size_in = sizeof(pkt_v6); 31 topts.data_size_out = sizeof(buf); 32 err = bpf_prog_test_run_opts(prog_fd, &topts); 33 ASSERT_OK(err, "ipv6"); 34 ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval"); 35 ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size"); 36 37 bpf_object__close(obj); 38 } 39 40 static void test_xdp_adjust_tail_grow(void) 41 { 42 const char *file = "./test_xdp_adjust_tail_grow.bpf.o"; 43 struct bpf_object *obj; 44 char buf[4096]; /* avoid segfault: large buf to hold grow results */ 45 __u32 expect_sz; 46 int err, prog_fd; 47 LIBBPF_OPTS(bpf_test_run_opts, topts, 48 .data_in = &pkt_v4, 49 .data_size_in = sizeof(pkt_v4), 50 .data_out = buf, 51 .data_size_out = sizeof(buf), 52 .repeat = 1, 53 ); 54 55 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); 56 if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow")) 57 return; 58 59 err = bpf_prog_test_run_opts(prog_fd, &topts); 60 ASSERT_OK(err, "ipv4"); 61 ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval"); 62 63 expect_sz = sizeof(pkt_v6) + 40; /* Test grow with 40 bytes */ 64 topts.data_in = &pkt_v6; 65 topts.data_size_in = sizeof(pkt_v6); 66 topts.data_size_out = sizeof(buf); 67 err = bpf_prog_test_run_opts(prog_fd, &topts); 68 ASSERT_OK(err, "ipv6"); 69 ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval"); 70 ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size"); 71 72 bpf_object__close(obj); 73 } 74 75 static void test_xdp_adjust_tail_grow2(void) 76 { 77 const char *file = "./test_xdp_adjust_tail_grow.bpf.o"; 78 char buf[4096]; /* avoid segfault: large buf to hold grow results */ 79 int tailroom = 320; /* SKB_DATA_ALIGN(sizeof(struct skb_shared_info))*/; 80 struct bpf_object *obj; 81 int err, cnt, i; 82 int max_grow, prog_fd; 83 84 LIBBPF_OPTS(bpf_test_run_opts, tattr, 85 .repeat = 1, 86 .data_in = &buf, 87 .data_out = &buf, 88 .data_size_in = 0, /* Per test */ 89 .data_size_out = 0, /* Per test */ 90 ); 91 92 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); 93 if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow")) 94 return; 95 96 /* Test case-64 */ 97 memset(buf, 1, sizeof(buf)); 98 tattr.data_size_in = 64; /* Determine test case via pkt size */ 99 tattr.data_size_out = 128; /* Limit copy_size */ 100 /* Kernel side alloc packet memory area that is zero init */ 101 err = bpf_prog_test_run_opts(prog_fd, &tattr); 102 103 ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */ 104 ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval"); 105 ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */ 106 107 /* Extra checks for data contents */ 108 ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /* 0-63 memset to 1 */ 109 ASSERT_EQ(buf[63], 1, "case-64-data buf[63]"); 110 ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */ 111 ASSERT_EQ(buf[127], 0, "case-64-data buf[127]"); 112 ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */ 113 ASSERT_EQ(buf[191], 1, "case-64-data buf[191]"); 114 115 /* Test case-128 */ 116 memset(buf, 2, sizeof(buf)); 117 tattr.data_size_in = 128; /* Determine test case via pkt size */ 118 tattr.data_size_out = sizeof(buf); /* Copy everything */ 119 err = bpf_prog_test_run_opts(prog_fd, &tattr); 120 121 max_grow = 4096 - XDP_PACKET_HEADROOM - tailroom; /* 3520 */ 122 ASSERT_OK(err, "case-128"); 123 ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval"); 124 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */ 125 126 /* Extra checks for data content: Count grow size, will contain zeros */ 127 for (i = 0, cnt = 0; i < sizeof(buf); i++) { 128 if (buf[i] == 0) 129 cnt++; 130 } 131 ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */ 132 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */ 133 134 bpf_object__close(obj); 135 } 136 137 static void test_xdp_adjust_frags_tail_shrink(void) 138 { 139 const char *file = "./test_xdp_adjust_tail_shrink.bpf.o"; 140 __u32 exp_size; 141 struct bpf_program *prog; 142 struct bpf_object *obj; 143 int err, prog_fd; 144 __u8 *buf; 145 LIBBPF_OPTS(bpf_test_run_opts, topts); 146 147 /* For the individual test cases, the first byte in the packet 148 * indicates which test will be run. 149 */ 150 obj = bpf_object__open(file); 151 if (libbpf_get_error(obj)) 152 return; 153 154 prog = bpf_object__next_program(obj, NULL); 155 if (bpf_object__load(obj)) 156 return; 157 158 prog_fd = bpf_program__fd(prog); 159 160 buf = malloc(9000); 161 if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb")) 162 goto out; 163 164 memset(buf, 0, 9000); 165 166 /* Test case removing 10 bytes from last frag, NOT freeing it */ 167 exp_size = 8990; /* 9000 - 10 */ 168 topts.data_in = buf; 169 topts.data_out = buf; 170 topts.data_size_in = 9000; 171 topts.data_size_out = 9000; 172 err = bpf_prog_test_run_opts(prog_fd, &topts); 173 174 ASSERT_OK(err, "9Kb-10b"); 175 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval"); 176 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size"); 177 178 /* Test case removing one of two pages, assuming 4K pages */ 179 buf[0] = 1; 180 exp_size = 4900; /* 9000 - 4100 */ 181 182 topts.data_size_out = 9000; /* reset from previous invocation */ 183 err = bpf_prog_test_run_opts(prog_fd, &topts); 184 185 ASSERT_OK(err, "9Kb-4Kb"); 186 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval"); 187 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size"); 188 189 /* Test case removing two pages resulting in a linear xdp_buff */ 190 buf[0] = 2; 191 exp_size = 800; /* 9000 - 8200 */ 192 topts.data_size_out = 9000; /* reset from previous invocation */ 193 err = bpf_prog_test_run_opts(prog_fd, &topts); 194 195 ASSERT_OK(err, "9Kb-9Kb"); 196 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval"); 197 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size"); 198 199 free(buf); 200 out: 201 bpf_object__close(obj); 202 } 203 204 static void test_xdp_adjust_frags_tail_grow(void) 205 { 206 const char *file = "./test_xdp_adjust_tail_grow.bpf.o"; 207 __u32 exp_size; 208 struct bpf_program *prog; 209 struct bpf_object *obj; 210 int err, i, prog_fd; 211 __u8 *buf; 212 LIBBPF_OPTS(bpf_test_run_opts, topts); 213 214 obj = bpf_object__open(file); 215 if (libbpf_get_error(obj)) 216 return; 217 218 prog = bpf_object__next_program(obj, NULL); 219 if (bpf_object__load(obj)) 220 return; 221 222 prog_fd = bpf_program__fd(prog); 223 224 buf = malloc(16384); 225 if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb")) 226 goto out; 227 228 /* Test case add 10 bytes to last frag */ 229 memset(buf, 1, 16384); 230 exp_size = 9000 + 10; 231 232 topts.data_in = buf; 233 topts.data_out = buf; 234 topts.data_size_in = 9000; 235 topts.data_size_out = 16384; 236 err = bpf_prog_test_run_opts(prog_fd, &topts); 237 238 ASSERT_OK(err, "9Kb+10b"); 239 ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval"); 240 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 241 242 for (i = 0; i < 9000; i++) 243 ASSERT_EQ(buf[i], 1, "9Kb+10b-old"); 244 245 for (i = 9000; i < 9010; i++) 246 ASSERT_EQ(buf[i], 0, "9Kb+10b-new"); 247 248 for (i = 9010; i < 16384; i++) 249 ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched"); 250 251 /* Test a too large grow */ 252 memset(buf, 1, 16384); 253 exp_size = 9001; 254 255 topts.data_in = topts.data_out = buf; 256 topts.data_size_in = 9001; 257 topts.data_size_out = 16384; 258 err = bpf_prog_test_run_opts(prog_fd, &topts); 259 260 ASSERT_OK(err, "9Kb+10b"); 261 ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval"); 262 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 263 264 free(buf); 265 out: 266 bpf_object__close(obj); 267 } 268 269 void test_xdp_adjust_tail(void) 270 { 271 if (test__start_subtest("xdp_adjust_tail_shrink")) 272 test_xdp_adjust_tail_shrink(); 273 if (test__start_subtest("xdp_adjust_tail_grow")) 274 test_xdp_adjust_tail_grow(); 275 if (test__start_subtest("xdp_adjust_tail_grow2")) 276 test_xdp_adjust_tail_grow2(); 277 if (test__start_subtest("xdp_adjust_frags_tail_shrink")) 278 test_xdp_adjust_frags_tail_shrink(); 279 if (test__start_subtest("xdp_adjust_frags_tail_grow")) 280 test_xdp_adjust_frags_tail_grow(); 281 } 282