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 struct bpf_object *obj; 80 int err, cnt, i; 81 int max_grow, prog_fd; 82 /* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */ 83 #if defined(__s390x__) 84 int tailroom = 512; 85 #else 86 int tailroom = 320; 87 #endif 88 89 LIBBPF_OPTS(bpf_test_run_opts, tattr, 90 .repeat = 1, 91 .data_in = &buf, 92 .data_out = &buf, 93 .data_size_in = 0, /* Per test */ 94 .data_size_out = 0, /* Per test */ 95 ); 96 97 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); 98 if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow")) 99 return; 100 101 /* Test case-64 */ 102 memset(buf, 1, sizeof(buf)); 103 tattr.data_size_in = 64; /* Determine test case via pkt size */ 104 tattr.data_size_out = 128; /* Limit copy_size */ 105 /* Kernel side alloc packet memory area that is zero init */ 106 err = bpf_prog_test_run_opts(prog_fd, &tattr); 107 108 ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */ 109 ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval"); 110 ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */ 111 112 /* Extra checks for data contents */ 113 ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /* 0-63 memset to 1 */ 114 ASSERT_EQ(buf[63], 1, "case-64-data buf[63]"); 115 ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */ 116 ASSERT_EQ(buf[127], 0, "case-64-data buf[127]"); 117 ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */ 118 ASSERT_EQ(buf[191], 1, "case-64-data buf[191]"); 119 120 /* Test case-128 */ 121 memset(buf, 2, sizeof(buf)); 122 tattr.data_size_in = 128; /* Determine test case via pkt size */ 123 tattr.data_size_out = sizeof(buf); /* Copy everything */ 124 err = bpf_prog_test_run_opts(prog_fd, &tattr); 125 126 max_grow = 4096 - XDP_PACKET_HEADROOM - tailroom; /* 3520 */ 127 ASSERT_OK(err, "case-128"); 128 ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval"); 129 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */ 130 131 /* Extra checks for data content: Count grow size, will contain zeros */ 132 for (i = 0, cnt = 0; i < sizeof(buf); i++) { 133 if (buf[i] == 0) 134 cnt++; 135 } 136 ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */ 137 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */ 138 139 bpf_object__close(obj); 140 } 141 142 static void test_xdp_adjust_frags_tail_shrink(void) 143 { 144 const char *file = "./test_xdp_adjust_tail_shrink.bpf.o"; 145 __u32 exp_size; 146 struct bpf_program *prog; 147 struct bpf_object *obj; 148 int err, prog_fd; 149 __u8 *buf; 150 LIBBPF_OPTS(bpf_test_run_opts, topts); 151 152 /* For the individual test cases, the first byte in the packet 153 * indicates which test will be run. 154 */ 155 obj = bpf_object__open(file); 156 if (libbpf_get_error(obj)) 157 return; 158 159 prog = bpf_object__next_program(obj, NULL); 160 if (bpf_object__load(obj)) 161 return; 162 163 prog_fd = bpf_program__fd(prog); 164 165 buf = malloc(9000); 166 if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb")) 167 goto out; 168 169 memset(buf, 0, 9000); 170 171 /* Test case removing 10 bytes from last frag, NOT freeing it */ 172 exp_size = 8990; /* 9000 - 10 */ 173 topts.data_in = buf; 174 topts.data_out = buf; 175 topts.data_size_in = 9000; 176 topts.data_size_out = 9000; 177 err = bpf_prog_test_run_opts(prog_fd, &topts); 178 179 ASSERT_OK(err, "9Kb-10b"); 180 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval"); 181 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size"); 182 183 /* Test case removing one of two pages, assuming 4K pages */ 184 buf[0] = 1; 185 exp_size = 4900; /* 9000 - 4100 */ 186 187 topts.data_size_out = 9000; /* reset from previous invocation */ 188 err = bpf_prog_test_run_opts(prog_fd, &topts); 189 190 ASSERT_OK(err, "9Kb-4Kb"); 191 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval"); 192 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size"); 193 194 /* Test case removing two pages resulting in a linear xdp_buff */ 195 buf[0] = 2; 196 exp_size = 800; /* 9000 - 8200 */ 197 topts.data_size_out = 9000; /* reset from previous invocation */ 198 err = bpf_prog_test_run_opts(prog_fd, &topts); 199 200 ASSERT_OK(err, "9Kb-9Kb"); 201 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval"); 202 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size"); 203 204 free(buf); 205 out: 206 bpf_object__close(obj); 207 } 208 209 static void test_xdp_adjust_frags_tail_grow(void) 210 { 211 const char *file = "./test_xdp_adjust_tail_grow.bpf.o"; 212 __u32 exp_size; 213 struct bpf_program *prog; 214 struct bpf_object *obj; 215 int err, i, prog_fd; 216 __u8 *buf; 217 LIBBPF_OPTS(bpf_test_run_opts, topts); 218 219 obj = bpf_object__open(file); 220 if (libbpf_get_error(obj)) 221 return; 222 223 prog = bpf_object__next_program(obj, NULL); 224 if (bpf_object__load(obj)) 225 return; 226 227 prog_fd = bpf_program__fd(prog); 228 229 buf = malloc(16384); 230 if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb")) 231 goto out; 232 233 /* Test case add 10 bytes to last frag */ 234 memset(buf, 1, 16384); 235 exp_size = 9000 + 10; 236 237 topts.data_in = buf; 238 topts.data_out = buf; 239 topts.data_size_in = 9000; 240 topts.data_size_out = 16384; 241 err = bpf_prog_test_run_opts(prog_fd, &topts); 242 243 ASSERT_OK(err, "9Kb+10b"); 244 ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval"); 245 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 246 247 for (i = 0; i < 9000; i++) 248 ASSERT_EQ(buf[i], 1, "9Kb+10b-old"); 249 250 for (i = 9000; i < 9010; i++) 251 ASSERT_EQ(buf[i], 0, "9Kb+10b-new"); 252 253 for (i = 9010; i < 16384; i++) 254 ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched"); 255 256 /* Test a too large grow */ 257 memset(buf, 1, 16384); 258 exp_size = 9001; 259 260 topts.data_in = topts.data_out = buf; 261 topts.data_size_in = 9001; 262 topts.data_size_out = 16384; 263 err = bpf_prog_test_run_opts(prog_fd, &topts); 264 265 ASSERT_OK(err, "9Kb+10b"); 266 ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval"); 267 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 268 269 free(buf); 270 out: 271 bpf_object__close(obj); 272 } 273 274 void test_xdp_adjust_tail(void) 275 { 276 if (test__start_subtest("xdp_adjust_tail_shrink")) 277 test_xdp_adjust_tail_shrink(); 278 if (test__start_subtest("xdp_adjust_tail_grow")) 279 test_xdp_adjust_tail_grow(); 280 if (test__start_subtest("xdp_adjust_tail_grow2")) 281 test_xdp_adjust_tail_grow2(); 282 if (test__start_subtest("xdp_adjust_frags_tail_shrink")) 283 test_xdp_adjust_frags_tail_shrink(); 284 if (test__start_subtest("xdp_adjust_frags_tail_grow")) 285 test_xdp_adjust_frags_tail_grow(); 286 } 287