xdp_adjust_tail.c (8224B)
1// SPDX-License-Identifier: GPL-2.0 2#include <test_progs.h> 3#include <network_helpers.h> 4 5static void test_xdp_adjust_tail_shrink(void) 6{ 7 const char *file = "./test_xdp_adjust_tail_shrink.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 40static void test_xdp_adjust_tail_grow(void) 41{ 42 const char *file = "./test_xdp_adjust_tail_grow.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 err = bpf_prog_test_run_opts(prog_fd, &topts); 67 ASSERT_OK(err, "ipv6"); 68 ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval"); 69 ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size"); 70 71 bpf_object__close(obj); 72} 73 74static void test_xdp_adjust_tail_grow2(void) 75{ 76 const char *file = "./test_xdp_adjust_tail_grow.o"; 77 char buf[4096]; /* avoid segfault: large buf to hold grow results */ 78 int tailroom = 320; /* SKB_DATA_ALIGN(sizeof(struct skb_shared_info))*/; 79 struct bpf_object *obj; 80 int err, cnt, i; 81 int max_grow, prog_fd; 82 83 LIBBPF_OPTS(bpf_test_run_opts, tattr, 84 .repeat = 1, 85 .data_in = &buf, 86 .data_out = &buf, 87 .data_size_in = 0, /* Per test */ 88 .data_size_out = 0, /* Per test */ 89 ); 90 91 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); 92 if (ASSERT_OK(err, "test_xdp_adjust_tail_grow")) 93 return; 94 95 /* Test case-64 */ 96 memset(buf, 1, sizeof(buf)); 97 tattr.data_size_in = 64; /* Determine test case via pkt size */ 98 tattr.data_size_out = 128; /* Limit copy_size */ 99 /* Kernel side alloc packet memory area that is zero init */ 100 err = bpf_prog_test_run_opts(prog_fd, &tattr); 101 102 ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */ 103 ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval"); 104 ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */ 105 106 /* Extra checks for data contents */ 107 ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /* 0-63 memset to 1 */ 108 ASSERT_EQ(buf[63], 1, "case-64-data buf[63]"); 109 ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */ 110 ASSERT_EQ(buf[127], 0, "case-64-data buf[127]"); 111 ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */ 112 ASSERT_EQ(buf[191], 1, "case-64-data buf[191]"); 113 114 /* Test case-128 */ 115 memset(buf, 2, sizeof(buf)); 116 tattr.data_size_in = 128; /* Determine test case via pkt size */ 117 tattr.data_size_out = sizeof(buf); /* Copy everything */ 118 err = bpf_prog_test_run_opts(prog_fd, &tattr); 119 120 max_grow = 4096 - XDP_PACKET_HEADROOM - tailroom; /* 3520 */ 121 ASSERT_OK(err, "case-128"); 122 ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval"); 123 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */ 124 125 /* Extra checks for data content: Count grow size, will contain zeros */ 126 for (i = 0, cnt = 0; i < sizeof(buf); i++) { 127 if (buf[i] == 0) 128 cnt++; 129 } 130 ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */ 131 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */ 132 133 bpf_object__close(obj); 134} 135 136static void test_xdp_adjust_frags_tail_shrink(void) 137{ 138 const char *file = "./test_xdp_adjust_tail_shrink.o"; 139 __u32 exp_size; 140 struct bpf_program *prog; 141 struct bpf_object *obj; 142 int err, prog_fd; 143 __u8 *buf; 144 LIBBPF_OPTS(bpf_test_run_opts, topts); 145 146 /* For the individual test cases, the first byte in the packet 147 * indicates which test will be run. 148 */ 149 obj = bpf_object__open(file); 150 if (libbpf_get_error(obj)) 151 return; 152 153 prog = bpf_object__next_program(obj, NULL); 154 if (bpf_object__load(obj)) 155 return; 156 157 prog_fd = bpf_program__fd(prog); 158 159 buf = malloc(9000); 160 if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb")) 161 goto out; 162 163 memset(buf, 0, 9000); 164 165 /* Test case removing 10 bytes from last frag, NOT freeing it */ 166 exp_size = 8990; /* 9000 - 10 */ 167 topts.data_in = buf; 168 topts.data_out = buf; 169 topts.data_size_in = 9000; 170 topts.data_size_out = 9000; 171 err = bpf_prog_test_run_opts(prog_fd, &topts); 172 173 ASSERT_OK(err, "9Kb-10b"); 174 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval"); 175 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size"); 176 177 /* Test case removing one of two pages, assuming 4K pages */ 178 buf[0] = 1; 179 exp_size = 4900; /* 9000 - 4100 */ 180 181 topts.data_size_out = 9000; /* reset from previous invocation */ 182 err = bpf_prog_test_run_opts(prog_fd, &topts); 183 184 ASSERT_OK(err, "9Kb-4Kb"); 185 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval"); 186 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size"); 187 188 /* Test case removing two pages resulting in a linear xdp_buff */ 189 buf[0] = 2; 190 exp_size = 800; /* 9000 - 8200 */ 191 topts.data_size_out = 9000; /* reset from previous invocation */ 192 err = bpf_prog_test_run_opts(prog_fd, &topts); 193 194 ASSERT_OK(err, "9Kb-9Kb"); 195 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval"); 196 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size"); 197 198 free(buf); 199out: 200 bpf_object__close(obj); 201} 202 203static void test_xdp_adjust_frags_tail_grow(void) 204{ 205 const char *file = "./test_xdp_adjust_tail_grow.o"; 206 __u32 exp_size; 207 struct bpf_program *prog; 208 struct bpf_object *obj; 209 int err, i, prog_fd; 210 __u8 *buf; 211 LIBBPF_OPTS(bpf_test_run_opts, topts); 212 213 obj = bpf_object__open(file); 214 if (libbpf_get_error(obj)) 215 return; 216 217 prog = bpf_object__next_program(obj, NULL); 218 if (bpf_object__load(obj)) 219 return; 220 221 prog_fd = bpf_program__fd(prog); 222 223 buf = malloc(16384); 224 if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb")) 225 goto out; 226 227 /* Test case add 10 bytes to last frag */ 228 memset(buf, 1, 16384); 229 exp_size = 9000 + 10; 230 231 topts.data_in = buf; 232 topts.data_out = buf; 233 topts.data_size_in = 9000; 234 topts.data_size_out = 16384; 235 err = bpf_prog_test_run_opts(prog_fd, &topts); 236 237 ASSERT_OK(err, "9Kb+10b"); 238 ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval"); 239 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 240 241 for (i = 0; i < 9000; i++) 242 ASSERT_EQ(buf[i], 1, "9Kb+10b-old"); 243 244 for (i = 9000; i < 9010; i++) 245 ASSERT_EQ(buf[i], 0, "9Kb+10b-new"); 246 247 for (i = 9010; i < 16384; i++) 248 ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched"); 249 250 /* Test a too large grow */ 251 memset(buf, 1, 16384); 252 exp_size = 9001; 253 254 topts.data_in = topts.data_out = buf; 255 topts.data_size_in = 9001; 256 topts.data_size_out = 16384; 257 err = bpf_prog_test_run_opts(prog_fd, &topts); 258 259 ASSERT_OK(err, "9Kb+10b"); 260 ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval"); 261 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size"); 262 263 free(buf); 264out: 265 bpf_object__close(obj); 266} 267 268void test_xdp_adjust_tail(void) 269{ 270 if (test__start_subtest("xdp_adjust_tail_shrink")) 271 test_xdp_adjust_tail_shrink(); 272 if (test__start_subtest("xdp_adjust_tail_grow")) 273 test_xdp_adjust_tail_grow(); 274 if (test__start_subtest("xdp_adjust_tail_grow2")) 275 test_xdp_adjust_tail_grow2(); 276 if (test__start_subtest("xdp_adjust_frags_tail_shrink")) 277 test_xdp_adjust_frags_tail_shrink(); 278 if (test__start_subtest("xdp_adjust_frags_tail_grow")) 279 test_xdp_adjust_frags_tail_grow(); 280}