| | 1 | /* |
| | 2 | * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem. |
| | 3 | * |
| | 4 | * Begun April 1, 1996, Mike Shaver. |
| | 5 | * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS] |
| | 6 | */ |
| | 7 | |
| | 8 | #include <linux/mm.h> |
| | 9 | #include <linux/module.h> |
| | 10 | #include <linux/sysctl.h> |
| | 11 | #include <linux/igmp.h> |
| | 12 | #include <linux/inetdevice.h> |
| | 13 | #include <linux/seqlock.h> |
| | 14 | #include <linux/init.h> |
| | 15 | #include <linux/slab.h> |
| | 16 | #include <linux/nsproxy.h> |
| | 17 | #include <linux/swap.h> |
| | 18 | #include <net/snmp.h> |
| | 19 | #include <net/icmp.h> |
| | 20 | #include <net/ip.h> |
| | 21 | #include <net/route.h> |
| | 22 | #include <net/tcp.h> |
| | 23 | #include <net/udp.h> |
| | 24 | #include <net/cipso_ipv4.h> |
| | 25 | #include <net/inet_frag.h> |
| | 26 | #include <net/ping.h> |
| | 27 | #include <net/tcp_memcontrol.h> |
| | 28 | |
| | 29 | static int zero; |
| | 30 | static int one = 1; |
| | 31 | static int two = 2; |
| | 32 | static int tcp_retr1_max = 255; |
| | 33 | static int ip_local_port_range_min[] = { 1, 1 }; |
| | 34 | static int ip_local_port_range_max[] = { 65535, 65535 }; |
| | 35 | static int tcp_adv_win_scale_min = -31; |
| | 36 | static int tcp_adv_win_scale_max = 31; |
| | 37 | static int ip_ttl_min = 1; |
| | 38 | static int ip_ttl_max = 255; |
| | 39 | static int ip_ping_group_range_min[] = { 0, 0 }; |
| | 40 | static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; |
| | 41 | |
| | 42 | /* Update system visible IP port range */ |
| | 43 | static void set_local_port_range(int range[2]) |
| | 44 | { |
| | 45 | write_seqlock(&sysctl_local_ports.lock); |
| | 46 | sysctl_local_ports.range[0] = range[0]; |
| | 47 | sysctl_local_ports.range[1] = range[1]; |
| | 48 | write_sequnlock(&sysctl_local_ports.lock); |
| | 49 | } |
| | 50 | |
| | 51 | /* Validate changes from /proc interface. */ |
| | 52 | static int ipv4_local_port_range(ctl_table *table, int write, |
| | 53 | void __user *buffer, |
| | 54 | size_t *lenp, loff_t *ppos) |
| | 55 | { |
| | 56 | int ret; |
| | 57 | int range[2]; |
| | 58 | ctl_table tmp = { |
| | 59 | .data = &range, |
| | 60 | .maxlen = sizeof(range), |
| | 61 | .mode = table->mode, |
| | 62 | .extra1 = &ip_local_port_range_min, |
| | 63 | .extra2 = &ip_local_port_range_max, |
| | 64 | }; |
| | 65 | |
| | 66 | inet_get_local_port_range(range, range + 1); |
| | 67 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| | 68 | |
| | 69 | if (write && ret == 0) { |
| | 70 | if (range[1] < range[0]) |
| | 71 | ret = -EINVAL; |
| | 72 | else |
| | 73 | set_local_port_range(range); |
| | 74 | } |
| | 75 | |
| | 76 | return ret; |
| | 77 | } |
| | 78 | |
| | 79 | |
| | 80 | static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) |
| | 81 | { |
| | 82 | kgid_t *data = table->data; |
| | 83 | unsigned int seq; |
| | 84 | do { |
| | 85 | seq = read_seqbegin(&sysctl_local_ports.lock); |
| | 86 | |
| | 87 | *low = data[0]; |
| | 88 | *high = data[1]; |
| | 89 | } while (read_seqretry(&sysctl_local_ports.lock, seq)); |
| | 90 | } |
| | 91 | |
| | 92 | /* Update system visible IP port range */ |
| | 93 | static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) |
| | 94 | { |
| | 95 | kgid_t *data = table->data; |
| | 96 | write_seqlock(&sysctl_local_ports.lock); |
| | 97 | data[0] = low; |
| | 98 | data[1] = high; |
| | 99 | write_sequnlock(&sysctl_local_ports.lock); |
| | 100 | } |
| | 101 | |
| | 102 | /* Validate changes from /proc interface. */ |
| | 103 | static int ipv4_ping_group_range(ctl_table *table, int write, |
| | 104 | void __user *buffer, |
| | 105 | size_t *lenp, loff_t *ppos) |
| | 106 | { |
| | 107 | struct user_namespace *user_ns = current_user_ns(); |
| | 108 | int ret; |
| | 109 | gid_t urange[2]; |
| | 110 | kgid_t low, high; |
| | 111 | ctl_table tmp = { |
| | 112 | .data = &urange, |
| | 113 | .maxlen = sizeof(urange), |
| | 114 | .mode = table->mode, |
| | 115 | .extra1 = &ip_ping_group_range_min, |
| | 116 | .extra2 = &ip_ping_group_range_max, |
| | 117 | }; |
| | 118 | |
| | 119 | inet_get_ping_group_range_table(table, &low, &high); |
| | 120 | urange[0] = from_kgid_munged(user_ns, low); |
| | 121 | urange[1] = from_kgid_munged(user_ns, high); |
| | 122 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| | 123 | |
| | 124 | if (write && ret == 0) { |
| | 125 | low = make_kgid(user_ns, urange[0]); |
| | 126 | high = make_kgid(user_ns, urange[1]); |
| | 127 | if (!gid_valid(low) || !gid_valid(high) || |
| | 128 | (urange[1] < urange[0]) || gid_lt(high, low)) { |
| | 129 | low = make_kgid(&init_user_ns, 1); |
| | 130 | high = make_kgid(&init_user_ns, 0); |
| | 131 | } |
| | 132 | set_ping_group_range(table, low, high); |
| | 133 | } |
| | 134 | |
| | 135 | return ret; |
| | 136 | } |
| | 137 | |
| | 138 | static int proc_tcp_congestion_control(ctl_table *ctl, int write, |
| | 139 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| | 140 | { |
| | 141 | char val[TCP_CA_NAME_MAX]; |
| | 142 | ctl_table tbl = { |
| | 143 | .data = val, |
| | 144 | .maxlen = TCP_CA_NAME_MAX, |
| | 145 | }; |
| | 146 | int ret; |
| | 147 | |
| | 148 | tcp_get_default_congestion_control(val); |
| | 149 | |
| | 150 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| | 151 | if (write && ret == 0) |
| | 152 | ret = tcp_set_default_congestion_control(val); |
| | 153 | return ret; |
| | 154 | } |
| | 155 | |
| | 156 | static int proc_tcp_available_congestion_control(ctl_table *ctl, |
| | 157 | int write, |
| | 158 | void __user *buffer, size_t *lenp, |
| | 159 | loff_t *ppos) |
| | 160 | { |
| | 161 | ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; |
| | 162 | int ret; |
| | 163 | |
| | 164 | tbl.data = kmalloc(tbl.maxlen, GFP_USER); |
| | 165 | if (!tbl.data) |
| | 166 | return -ENOMEM; |
| | 167 | tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); |
| | 168 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| | 169 | kfree(tbl.data); |
| | 170 | return ret; |
| | 171 | } |
| | 172 | |
| | 173 | static int proc_allowed_congestion_control(ctl_table *ctl, |
| | 174 | int write, |
| | 175 | void __user *buffer, size_t *lenp, |
| | 176 | loff_t *ppos) |
| | 177 | { |
| | 178 | ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; |
| | 179 | int ret; |
| | 180 | |
| | 181 | tbl.data = kmalloc(tbl.maxlen, GFP_USER); |
| | 182 | if (!tbl.data) |
| | 183 | return -ENOMEM; |
| | 184 | |
| | 185 | tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); |
| | 186 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| | 187 | if (write && ret == 0) |
| | 188 | ret = tcp_set_allowed_congestion_control(tbl.data); |
| | 189 | kfree(tbl.data); |
| | 190 | return ret; |
| | 191 | } |
| | 192 | |
| | 193 | static int ipv4_tcp_mem(ctl_table *ctl, int write, |
| | 194 | void __user *buffer, size_t *lenp, |
| | 195 | loff_t *ppos) |
| | 196 | { |
| | 197 | int ret; |
| | 198 | unsigned long vec[3]; |
| | 199 | struct net *net = current->nsproxy->net_ns; |
| | 200 | #ifdef CONFIG_MEMCG_KMEM |
| | 201 | struct mem_cgroup *memcg; |
| | 202 | #endif |
| | 203 | |
| | 204 | ctl_table tmp = { |
| | 205 | .data = &vec, |
| | 206 | .maxlen = sizeof(vec), |
| | 207 | .mode = ctl->mode, |
| | 208 | }; |
| | 209 | |
| | 210 | if (!write) { |
| | 211 | ctl->data = &net->ipv4.sysctl_tcp_mem; |
| | 212 | return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos); |
| | 213 | } |
| | 214 | |
| | 215 | ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos); |
| | 216 | if (ret) |
| | 217 | return ret; |
| | 218 | |
| | 219 | #ifdef CONFIG_MEMCG_KMEM |
| | 220 | rcu_read_lock(); |
| | 221 | memcg = mem_cgroup_from_task(current); |
| | 222 | |
| | 223 | tcp_prot_mem(memcg, vec[0], 0); |
| | 224 | tcp_prot_mem(memcg, vec[1], 1); |
| | 225 | tcp_prot_mem(memcg, vec[2], 2); |
| | 226 | rcu_read_unlock(); |
| | 227 | #endif |
| | 228 | |
| | 229 | net->ipv4.sysctl_tcp_mem[0] = vec[0]; |
| | 230 | net->ipv4.sysctl_tcp_mem[1] = vec[1]; |
| | 231 | net->ipv4.sysctl_tcp_mem[2] = vec[2]; |
| | 232 | |
| | 233 | return 0; |
| | 234 | } |
| | 235 | |
| | 236 | static int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer, |
| | 237 | size_t *lenp, loff_t *ppos) |
| | 238 | { |
| | 239 | ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) }; |
| | 240 | struct tcp_fastopen_context *ctxt; |
| | 241 | int ret; |
| | 242 | u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */ |
| | 243 | |
| | 244 | tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); |
| | 245 | if (!tbl.data) |
| | 246 | return -ENOMEM; |
| | 247 | |
| | 248 | rcu_read_lock(); |
| | 249 | ctxt = rcu_dereference(tcp_fastopen_ctx); |
| | 250 | if (ctxt) |
| | 251 | memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH); |
| | 252 | else |
| | 253 | memset(user_key, 0, sizeof(user_key)); |
| | 254 | rcu_read_unlock(); |
| | 255 | |
| | 256 | snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x", |
| | 257 | user_key[0], user_key[1], user_key[2], user_key[3]); |
| | 258 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| | 259 | |
| | 260 | if (write && ret == 0) { |
| | 261 | if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1, |
| | 262 | user_key + 2, user_key + 3) != 4) { |
| | 263 | ret = -EINVAL; |
| | 264 | goto bad_key; |
| | 265 | } |
| | 266 | tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH); |
| | 267 | } |
| | 268 | |
| | 269 | bad_key: |
| | 270 | pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", |
| | 271 | user_key[0], user_key[1], user_key[2], user_key[3], |
| | 272 | (char *)tbl.data, ret); |
| | 273 | kfree(tbl.data); |
| | 274 | return ret; |
| | 275 | } |
| | 276 | |
| | 277 | static struct ctl_table ipv4_table[] = { |
| | 278 | { |
| | 279 | .procname = "tcp_timestamps", |
| | 280 | .data = &sysctl_tcp_timestamps, |
| | 281 | .maxlen = sizeof(int), |
| | 282 | .mode = 0644, |
| | 283 | .proc_handler = proc_dointvec |
| | 284 | }, |
| | 285 | { |
| | 286 | .procname = "tcp_window_scaling", |
| | 287 | .data = &sysctl_tcp_window_scaling, |
| | 288 | .maxlen = sizeof(int), |
| | 289 | .mode = 0644, |
| | 290 | .proc_handler = proc_dointvec |
| | 291 | }, |
| | 292 | { |
| | 293 | .procname = "tcp_sack", |
| | 294 | .data = &sysctl_tcp_sack, |
| | 295 | .maxlen = sizeof(int), |
| | 296 | .mode = 0644, |
| | 297 | .proc_handler = proc_dointvec |
| | 298 | }, |
| | 299 | { |
| | 300 | .procname = "tcp_retrans_collapse", |
| | 301 | .data = &sysctl_tcp_retrans_collapse, |
| | 302 | .maxlen = sizeof(int), |
| | 303 | .mode = 0644, |
| | 304 | .proc_handler = proc_dointvec |
| | 305 | }, |
| | 306 | { |
| | 307 | .procname = "ip_default_ttl", |
| | 308 | .data = &sysctl_ip_default_ttl, |
| | 309 | .maxlen = sizeof(int), |
| | 310 | .mode = 0644, |
| | 311 | .proc_handler = proc_dointvec_minmax, |
| | 312 | .extra1 = &ip_ttl_min, |
| | 313 | .extra2 = &ip_ttl_max, |
| | 314 | }, |
| | 315 | { |
| | 316 | .procname = "ip_no_pmtu_disc", |
| | 317 | .data = &ipv4_config.no_pmtu_disc, |
| | 318 | .maxlen = sizeof(int), |
| | 319 | .mode = 0644, |
| | 320 | .proc_handler = proc_dointvec |
| | 321 | }, |
| | 322 | { |
| | 323 | .procname = "ip_nonlocal_bind", |
| | 324 | .data = &sysctl_ip_nonlocal_bind, |
| | 325 | .maxlen = sizeof(int), |
| | 326 | .mode = 0644, |
| | 327 | .proc_handler = proc_dointvec |
| | 328 | }, |
| | 329 | { |
| | 330 | .procname = "tcp_syn_retries", |
| | 331 | .data = &sysctl_tcp_syn_retries, |
| | 332 | .maxlen = sizeof(int), |
| | 333 | .mode = 0644, |
| | 334 | .proc_handler = proc_dointvec |
| | 335 | }, |
| | 336 | { |
| | 337 | .procname = "tcp_synack_retries", |
| | 338 | .data = &sysctl_tcp_synack_retries, |
| | 339 | .maxlen = sizeof(int), |
| | 340 | .mode = 0644, |
| | 341 | .proc_handler = proc_dointvec |
| | 342 | }, |
| | 343 | { |
| | 344 | .procname = "tcp_max_orphans", |
| | 345 | .data = &sysctl_tcp_max_orphans, |
| | 346 | .maxlen = sizeof(int), |
| | 347 | .mode = 0644, |
| | 348 | .proc_handler = proc_dointvec |
| | 349 | }, |
| | 350 | { |
| | 351 | .procname = "tcp_max_tw_buckets", |
| | 352 | .data = &tcp_death_row.sysctl_max_tw_buckets, |
| | 353 | .maxlen = sizeof(int), |
| | 354 | .mode = 0644, |
| | 355 | .proc_handler = proc_dointvec |
| | 356 | }, |
| | 357 | { |
| | 358 | .procname = "ip_early_demux", |
| | 359 | .data = &sysctl_ip_early_demux, |
| | 360 | .maxlen = sizeof(int), |
| | 361 | .mode = 0644, |
| | 362 | .proc_handler = proc_dointvec |
| | 363 | }, |
| | 364 | { |
| | 365 | .procname = "ip_dynaddr", |
| | 366 | .data = &sysctl_ip_dynaddr, |
| | 367 | .maxlen = sizeof(int), |
| | 368 | .mode = 0644, |
| | 369 | .proc_handler = proc_dointvec |
| | 370 | }, |
| | 371 | { |
| | 372 | .procname = "tcp_keepalive_time", |
| | 373 | .data = &sysctl_tcp_keepalive_time, |
| | 374 | .maxlen = sizeof(int), |
| | 375 | .mode = 0644, |
| | 376 | .proc_handler = proc_dointvec_jiffies, |
| | 377 | }, |
| | 378 | { |
| | 379 | .procname = "tcp_keepalive_probes", |
| | 380 | .data = &sysctl_tcp_keepalive_probes, |
| | 381 | .maxlen = sizeof(int), |
| | 382 | .mode = 0644, |
| | 383 | .proc_handler = proc_dointvec |
| | 384 | }, |
| | 385 | { |
| | 386 | .procname = "tcp_keepalive_intvl", |
| | 387 | .data = &sysctl_tcp_keepalive_intvl, |
| | 388 | .maxlen = sizeof(int), |
| | 389 | .mode = 0644, |
| | 390 | .proc_handler = proc_dointvec_jiffies, |
| | 391 | }, |
| | 392 | { |
| | 393 | .procname = "tcp_retries1", |
| | 394 | .data = &sysctl_tcp_retries1, |
| | 395 | .maxlen = sizeof(int), |
| | 396 | .mode = 0644, |
| | 397 | .proc_handler = proc_dointvec_minmax, |
| | 398 | .extra2 = &tcp_retr1_max |
| | 399 | }, |
| | 400 | { |
| | 401 | .procname = "tcp_retries2", |
| | 402 | .data = &sysctl_tcp_retries2, |
| | 403 | .maxlen = sizeof(int), |
| | 404 | .mode = 0644, |
| | 405 | .proc_handler = proc_dointvec |
| | 406 | }, |
| | 407 | { |
| | 408 | .procname = "tcp_fin_timeout", |
| | 409 | .data = &sysctl_tcp_fin_timeout, |
| | 410 | .maxlen = sizeof(int), |
| | 411 | .mode = 0644, |
| | 412 | .proc_handler = proc_dointvec_jiffies, |
| | 413 | }, |
| | 414 | #ifdef CONFIG_SYN_COOKIES |
| | 415 | { |
| | 416 | .procname = "tcp_syncookies", |
| | 417 | .data = &sysctl_tcp_syncookies, |
| | 418 | .maxlen = sizeof(int), |
| | 419 | .mode = 0644, |
| | 420 | .proc_handler = proc_dointvec |
| | 421 | }, |
| | 422 | #endif |
| | 423 | { |
| | 424 | .procname = "tcp_fastopen", |
| | 425 | .data = &sysctl_tcp_fastopen, |
| | 426 | .maxlen = sizeof(int), |
| | 427 | .mode = 0644, |
| | 428 | .proc_handler = proc_dointvec, |
| | 429 | }, |
| | 430 | { |
| | 431 | .procname = "tcp_fastopen_key", |
| | 432 | .mode = 0600, |
| | 433 | .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10), |
| | 434 | .proc_handler = proc_tcp_fastopen_key, |
| | 435 | }, |
| | 436 | { |
| | 437 | .procname = "tcp_tw_recycle", |
| | 438 | .data = &tcp_death_row.sysctl_tw_recycle, |
| | 439 | .maxlen = sizeof(int), |
| | 440 | .mode = 0644, |
| | 441 | .proc_handler = proc_dointvec |
| | 442 | }, |
| | 443 | { |
| | 444 | .procname = "tcp_abort_on_overflow", |
| | 445 | .data = &sysctl_tcp_abort_on_overflow, |
| | 446 | .maxlen = sizeof(int), |
| | 447 | .mode = 0644, |
| | 448 | .proc_handler = proc_dointvec |
| | 449 | }, |
| | 450 | { |
| | 451 | .procname = "tcp_stdurg", |
| | 452 | .data = &sysctl_tcp_stdurg, |
| | 453 | .maxlen = sizeof(int), |
| | 454 | .mode = 0644, |
| | 455 | .proc_handler = proc_dointvec |
| | 456 | }, |
| | 457 | { |
| | 458 | .procname = "tcp_rfc1337", |
| | 459 | .data = &sysctl_tcp_rfc1337, |
| | 460 | .maxlen = sizeof(int), |
| | 461 | .mode = 0644, |
| | 462 | .proc_handler = proc_dointvec |
| | 463 | }, |
| | 464 | { |
| | 465 | .procname = "tcp_max_syn_backlog", |
| | 466 | .data = &sysctl_max_syn_backlog, |
| | 467 | .maxlen = sizeof(int), |
| | 468 | .mode = 0644, |
| | 469 | .proc_handler = proc_dointvec |
| | 470 | }, |
| | 471 | { |
| | 472 | .procname = "ip_local_port_range", |
| | 473 | .data = &sysctl_local_ports.range, |
| | 474 | .maxlen = sizeof(sysctl_local_ports.range), |
| | 475 | .mode = 0644, |
| | 476 | .proc_handler = ipv4_local_port_range, |
| | 477 | }, |
| | 478 | { |
| | 479 | .procname = "ip_local_reserved_ports", |
| | 480 | .data = NULL, /* initialized in sysctl_ipv4_init */ |
| | 481 | .maxlen = 65536, |
| | 482 | .mode = 0644, |
| | 483 | .proc_handler = proc_do_large_bitmap, |
| | 484 | }, |
| | 485 | { |
| | 486 | .procname = "igmp_max_memberships", |
| | 487 | .data = &sysctl_igmp_max_memberships, |
| | 488 | .maxlen = sizeof(int), |
| | 489 | .mode = 0644, |
| | 490 | .proc_handler = proc_dointvec |
| | 491 | }, |
| | 492 | { |
| | 493 | .procname = "igmp_max_msf", |
| | 494 | .data = &sysctl_igmp_max_msf, |
| | 495 | .maxlen = sizeof(int), |
| | 496 | .mode = 0644, |
| | 497 | .proc_handler = proc_dointvec |
| | 498 | }, |
| | 499 | { |
| | 500 | .procname = "inet_peer_threshold", |
| | 501 | .data = &inet_peer_threshold, |
| | 502 | .maxlen = sizeof(int), |
| | 503 | .mode = 0644, |
| | 504 | .proc_handler = proc_dointvec |
| | 505 | }, |
| | 506 | { |
| | 507 | .procname = "inet_peer_minttl", |
| | 508 | .data = &inet_peer_minttl, |
| | 509 | .maxlen = sizeof(int), |
| | 510 | .mode = 0644, |
| | 511 | .proc_handler = proc_dointvec_jiffies, |
| | 512 | }, |
| | 513 | { |
| | 514 | .procname = "inet_peer_maxttl", |
| | 515 | .data = &inet_peer_maxttl, |
| | 516 | .maxlen = sizeof(int), |
| | 517 | .mode = 0644, |
| | 518 | .proc_handler = proc_dointvec_jiffies, |
| | 519 | }, |
| | 520 | { |
| | 521 | .procname = "tcp_orphan_retries", |
| | 522 | .data = &sysctl_tcp_orphan_retries, |
| | 523 | .maxlen = sizeof(int), |
| | 524 | .mode = 0644, |
| | 525 | .proc_handler = proc_dointvec |
| | 526 | }, |
| | 527 | { |
| | 528 | .procname = "tcp_fack", |
| | 529 | .data = &sysctl_tcp_fack, |
| | 530 | .maxlen = sizeof(int), |
| | 531 | .mode = 0644, |
| | 532 | .proc_handler = proc_dointvec |
| | 533 | }, |
| | 534 | { |
| | 535 | .procname = "tcp_reordering", |
| | 536 | .data = &sysctl_tcp_reordering, |
| | 537 | .maxlen = sizeof(int), |
| | 538 | .mode = 0644, |
| | 539 | .proc_handler = proc_dointvec |
| | 540 | }, |
| | 541 | { |
| | 542 | .procname = "tcp_dsack", |
| | 543 | .data = &sysctl_tcp_dsack, |
| | 544 | .maxlen = sizeof(int), |
| | 545 | .mode = 0644, |
| | 546 | .proc_handler = proc_dointvec |
| | 547 | }, |
| | 548 | { |
| | 549 | .procname = "tcp_wmem", |
| | 550 | .data = &sysctl_tcp_wmem, |
| | 551 | .maxlen = sizeof(sysctl_tcp_wmem), |
| | 552 | .mode = 0644, |
| | 553 | .proc_handler = proc_dointvec_minmax, |
| | 554 | .extra1 = &one, |
| | 555 | }, |
| | 556 | { |
| | 557 | .procname = "tcp_rmem", |
| | 558 | .data = &sysctl_tcp_rmem, |
| | 559 | .maxlen = sizeof(sysctl_tcp_rmem), |
| | 560 | .mode = 0644, |
| | 561 | .proc_handler = proc_dointvec_minmax, |
| | 562 | .extra1 = &one, |
| | 563 | }, |
| | 564 | { |
| | 565 | .procname = "tcp_app_win", |
| | 566 | .data = &sysctl_tcp_app_win, |
| | 567 | .maxlen = sizeof(int), |
| | 568 | .mode = 0644, |
| | 569 | .proc_handler = proc_dointvec |
| | 570 | }, |
| | 571 | { |
| | 572 | .procname = "tcp_adv_win_scale", |
| | 573 | .data = &sysctl_tcp_adv_win_scale, |
| | 574 | .maxlen = sizeof(int), |
| | 575 | .mode = 0644, |
| | 576 | .proc_handler = proc_dointvec_minmax, |
| | 577 | .extra1 = &tcp_adv_win_scale_min, |
| | 578 | .extra2 = &tcp_adv_win_scale_max, |
| | 579 | }, |
| | 580 | { |
| | 581 | .procname = "tcp_tw_reuse", |
| | 582 | .data = &sysctl_tcp_tw_reuse, |
| | 583 | .maxlen = sizeof(int), |
| | 584 | .mode = 0644, |
| | 585 | .proc_handler = proc_dointvec |
| | 586 | }, |
| | 587 | { |
| | 588 | .procname = "tcp_frto", |
| | 589 | .data = &sysctl_tcp_frto, |
| | 590 | .maxlen = sizeof(int), |
| | 591 | .mode = 0644, |
| | 592 | .proc_handler = proc_dointvec |
| | 593 | }, |
| | 594 | { |
| | 595 | .procname = "tcp_frto_response", |
| | 596 | .data = &sysctl_tcp_frto_response, |
| | 597 | .maxlen = sizeof(int), |
| | 598 | .mode = 0644, |
| | 599 | .proc_handler = proc_dointvec |
| | 600 | }, |
| | 601 | { |
| | 602 | .procname = "tcp_low_latency", |
| | 603 | .data = &sysctl_tcp_low_latency, |
| | 604 | .maxlen = sizeof(int), |
| | 605 | .mode = 0644, |
| | 606 | .proc_handler = proc_dointvec |
| | 607 | }, |
| | 608 | { |
| | 609 | .procname = "tcp_no_metrics_save", |
| | 610 | .data = &sysctl_tcp_nometrics_save, |
| | 611 | .maxlen = sizeof(int), |
| | 612 | .mode = 0644, |
| | 613 | .proc_handler = proc_dointvec, |
| | 614 | }, |
| | 615 | { |
| | 616 | .procname = "tcp_moderate_rcvbuf", |
| | 617 | .data = &sysctl_tcp_moderate_rcvbuf, |
| | 618 | .maxlen = sizeof(int), |
| | 619 | .mode = 0644, |
| | 620 | .proc_handler = proc_dointvec, |
| | 621 | }, |
| | 622 | { |
| | 623 | .procname = "tcp_tso_win_divisor", |
| | 624 | .data = &sysctl_tcp_tso_win_divisor, |
| | 625 | .maxlen = sizeof(int), |
| | 626 | .mode = 0644, |
| | 627 | .proc_handler = proc_dointvec, |
| | 628 | }, |
| | 629 | { |
| | 630 | .procname = "tcp_congestion_control", |
| | 631 | .mode = 0644, |
| | 632 | .maxlen = TCP_CA_NAME_MAX, |
| | 633 | .proc_handler = proc_tcp_congestion_control, |
| | 634 | }, |
| | 635 | { |
| | 636 | .procname = "tcp_mtu_probing", |
| | 637 | .data = &sysctl_tcp_mtu_probing, |
| | 638 | .maxlen = sizeof(int), |
| | 639 | .mode = 0644, |
| | 640 | .proc_handler = proc_dointvec, |
| | 641 | }, |
| | 642 | { |
| | 643 | .procname = "tcp_base_mss", |
| | 644 | .data = &sysctl_tcp_base_mss, |
| | 645 | .maxlen = sizeof(int), |
| | 646 | .mode = 0644, |
| | 647 | .proc_handler = proc_dointvec, |
| | 648 | }, |
| | 649 | { |
| | 650 | .procname = "tcp_workaround_signed_windows", |
| | 651 | .data = &sysctl_tcp_workaround_signed_windows, |
| | 652 | .maxlen = sizeof(int), |
| | 653 | .mode = 0644, |
| | 654 | .proc_handler = proc_dointvec |
| | 655 | }, |
| | 656 | { |
| | 657 | .procname = "tcp_limit_output_bytes", |
| | 658 | .data = &sysctl_tcp_limit_output_bytes, |
| | 659 | .maxlen = sizeof(int), |
| | 660 | .mode = 0644, |
| | 661 | .proc_handler = proc_dointvec |
| | 662 | }, |
| | 663 | { |
| | 664 | .procname = "tcp_challenge_ack_limit", |
| | 665 | .data = &sysctl_tcp_challenge_ack_limit, |
| | 666 | .maxlen = sizeof(int), |
| | 667 | .mode = 0644, |
| | 668 | .proc_handler = proc_dointvec |
| | 669 | }, |
| | 670 | #ifdef CONFIG_NET_DMA |
| | 671 | { |
| | 672 | .procname = "tcp_dma_copybreak", |
| | 673 | .data = &sysctl_tcp_dma_copybreak, |
| | 674 | .maxlen = sizeof(int), |
| | 675 | .mode = 0644, |
| | 676 | .proc_handler = proc_dointvec |
| | 677 | }, |
| | 678 | #endif |
| | 679 | { |
| | 680 | .procname = "tcp_slow_start_after_idle", |
| | 681 | .data = &sysctl_tcp_slow_start_after_idle, |
| | 682 | .maxlen = sizeof(int), |
| | 683 | .mode = 0644, |
| | 684 | .proc_handler = proc_dointvec |
| | 685 | }, |
| | 686 | #ifdef CONFIG_NETLABEL |
| | 687 | { |
| | 688 | .procname = "cipso_cache_enable", |
| | 689 | .data = &cipso_v4_cache_enabled, |
| | 690 | .maxlen = sizeof(int), |
| | 691 | .mode = 0644, |
| | 692 | .proc_handler = proc_dointvec, |
| | 693 | }, |
| | 694 | { |
| | 695 | .procname = "cipso_cache_bucket_size", |
| | 696 | .data = &cipso_v4_cache_bucketsize, |
| | 697 | .maxlen = sizeof(int), |
| | 698 | .mode = 0644, |
| | 699 | .proc_handler = proc_dointvec, |
| | 700 | }, |
| | 701 | { |
| | 702 | .procname = "cipso_rbm_optfmt", |
| | 703 | .data = &cipso_v4_rbm_optfmt, |
| | 704 | .maxlen = sizeof(int), |
| | 705 | .mode = 0644, |
| | 706 | .proc_handler = proc_dointvec, |
| | 707 | }, |
| | 708 | { |
| | 709 | .procname = "cipso_rbm_strictvalid", |
| | 710 | .data = &cipso_v4_rbm_strictvalid, |
| | 711 | .maxlen = sizeof(int), |
| | 712 | .mode = 0644, |
| | 713 | .proc_handler = proc_dointvec, |
| | 714 | }, |
| | 715 | #endif /* CONFIG_NETLABEL */ |
| | 716 | { |
| | 717 | .procname = "tcp_available_congestion_control", |
| | 718 | .maxlen = TCP_CA_BUF_MAX, |
| | 719 | .mode = 0444, |
| | 720 | .proc_handler = proc_tcp_available_congestion_control, |
| | 721 | }, |
| | 722 | { |
| | 723 | .procname = "tcp_allowed_congestion_control", |
| | 724 | .maxlen = TCP_CA_BUF_MAX, |
| | 725 | .mode = 0644, |
| | 726 | .proc_handler = proc_allowed_congestion_control, |
| | 727 | }, |
| | 728 | { |
| | 729 | .procname = "tcp_max_ssthresh", |
| | 730 | .data = &sysctl_tcp_max_ssthresh, |
| | 731 | .maxlen = sizeof(int), |
| | 732 | .mode = 0644, |
| | 733 | .proc_handler = proc_dointvec, |
| | 734 | }, |
| | 735 | { |
| | 736 | .procname = "tcp_cookie_size", |
| | 737 | .data = &sysctl_tcp_cookie_size, |
| | 738 | .maxlen = sizeof(int), |
| | 739 | .mode = 0644, |
| | 740 | .proc_handler = proc_dointvec |
| | 741 | }, |
| | 742 | { |
| | 743 | .procname = "tcp_thin_linear_timeouts", |
| | 744 | .data = &sysctl_tcp_thin_linear_timeouts, |
| | 745 | .maxlen = sizeof(int), |
| | 746 | .mode = 0644, |
| | 747 | .proc_handler = proc_dointvec |
| | 748 | }, |
| | 749 | { |
| | 750 | .procname = "tcp_thin_dupack", |
| | 751 | .data = &sysctl_tcp_thin_dupack, |
| | 752 | .maxlen = sizeof(int), |
| | 753 | .mode = 0644, |
| | 754 | .proc_handler = proc_dointvec |
| | 755 | }, |
| | 756 | { |
| | 757 | .procname = "tcp_early_retrans", |
| | 758 | .data = &sysctl_tcp_early_retrans, |
| | 759 | .maxlen = sizeof(int), |
| | 760 | .mode = 0644, |
| | 761 | .proc_handler = proc_dointvec_minmax, |
| | 762 | .extra1 = &zero, |
| | 763 | .extra2 = &two, |
| | 764 | }, |
| | 765 | { |
| | 766 | .procname = "udp_mem", |
| | 767 | .data = &sysctl_udp_mem, |
| | 768 | .maxlen = sizeof(sysctl_udp_mem), |
| | 769 | .mode = 0644, |
| | 770 | .proc_handler = proc_doulongvec_minmax, |
| | 771 | }, |
| | 772 | { |
| | 773 | .procname = "udp_rmem_min", |
| | 774 | .data = &sysctl_udp_rmem_min, |
| | 775 | .maxlen = sizeof(sysctl_udp_rmem_min), |
| | 776 | .mode = 0644, |
| | 777 | .proc_handler = proc_dointvec_minmax, |
| | 778 | .extra1 = &one |
| | 779 | }, |
| | 780 | { |
| | 781 | .procname = "udp_wmem_min", |
| | 782 | .data = &sysctl_udp_wmem_min, |
| | 783 | .maxlen = sizeof(sysctl_udp_wmem_min), |
| | 784 | .mode = 0644, |
| | 785 | .proc_handler = proc_dointvec_minmax, |
| | 786 | .extra1 = &one |
| | 787 | }, |
| | 788 | { } |
| | 789 | }; |
| | 790 | |
| | 791 | static struct ctl_table ipv4_net_table[] = { |
| | 792 | { |
| | 793 | .procname = "icmp_echo_ignore_all", |
| | 794 | .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, |
| | 795 | .maxlen = sizeof(int), |
| | 796 | .mode = 0644, |
| | 797 | .proc_handler = proc_dointvec |
| | 798 | }, |
| | 799 | { |
| | 800 | .procname = "icmp_echo_ignore_broadcasts", |
| | 801 | .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, |
| | 802 | .maxlen = sizeof(int), |
| | 803 | .mode = 0644, |
| | 804 | .proc_handler = proc_dointvec |
| | 805 | }, |
| | 806 | { |
| | 807 | .procname = "icmp_ignore_bogus_error_responses", |
| | 808 | .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, |
| | 809 | .maxlen = sizeof(int), |
| | 810 | .mode = 0644, |
| | 811 | .proc_handler = proc_dointvec |
| | 812 | }, |
| | 813 | { |
| | 814 | .procname = "icmp_errors_use_inbound_ifaddr", |
| | 815 | .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, |
| | 816 | .maxlen = sizeof(int), |
| | 817 | .mode = 0644, |
| | 818 | .proc_handler = proc_dointvec |
| | 819 | }, |
| | 820 | { |
| | 821 | .procname = "icmp_ratelimit", |
| | 822 | .data = &init_net.ipv4.sysctl_icmp_ratelimit, |
| | 823 | .maxlen = sizeof(int), |
| | 824 | .mode = 0644, |
| | 825 | .proc_handler = proc_dointvec_ms_jiffies, |
| | 826 | }, |
| | 827 | { |
| | 828 | .procname = "icmp_ratemask", |
| | 829 | .data = &init_net.ipv4.sysctl_icmp_ratemask, |
| | 830 | .maxlen = sizeof(int), |
| | 831 | .mode = 0644, |
| | 832 | .proc_handler = proc_dointvec |
| | 833 | }, |
| | 834 | { |
| | 835 | .procname = "ping_group_range", |
| | 836 | .data = &init_net.ipv4.sysctl_ping_group_range, |
| | 837 | .maxlen = sizeof(gid_t)*2, |
| | 838 | .mode = 0644, |
| | 839 | .proc_handler = ipv4_ping_group_range, |
| | 840 | }, |
| | 841 | { |
| | 842 | .procname = "tcp_ecn", |
| | 843 | .data = &init_net.ipv4.sysctl_tcp_ecn, |
| | 844 | .maxlen = sizeof(int), |
| | 845 | .mode = 0644, |
| | 846 | .proc_handler = proc_dointvec |
| | 847 | }, |
| | 848 | { |
| | 849 | .procname = "tcp_mem", |
| | 850 | .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem), |
| | 851 | .mode = 0644, |
| | 852 | .proc_handler = ipv4_tcp_mem, |
| | 853 | }, |
| | 854 | { } |
| | 855 | }; |
| | 856 | |
| | 857 | static __net_init int ipv4_sysctl_init_net(struct net *net) |
| | 858 | { |
| | 859 | struct ctl_table *table; |
| | 860 | |
| | 861 | table = ipv4_net_table; |
| | 862 | if (!net_eq(net, &init_net)) { |
| | 863 | table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); |
| | 864 | if (table == NULL) |
| | 865 | goto err_alloc; |
| | 866 | |
| | 867 | table[0].data = |
| | 868 | &net->ipv4.sysctl_icmp_echo_ignore_all; |
| | 869 | table[1].data = |
| | 870 | &net->ipv4.sysctl_icmp_echo_ignore_broadcasts; |
| | 871 | table[2].data = |
| | 872 | &net->ipv4.sysctl_icmp_ignore_bogus_error_responses; |
| | 873 | table[3].data = |
| | 874 | &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr; |
| | 875 | table[4].data = |
| | 876 | &net->ipv4.sysctl_icmp_ratelimit; |
| | 877 | table[5].data = |
| | 878 | &net->ipv4.sysctl_icmp_ratemask; |
| | 879 | table[6].data = |
| | 880 | &net->ipv4.sysctl_ping_group_range; |
| | 881 | table[7].data = |
| | 882 | &net->ipv4.sysctl_tcp_ecn; |
| | 883 | |
| | 884 | /* Don't export sysctls to unprivileged users */ |
| | 885 | if (net->user_ns != &init_user_ns) |
| | 886 | table[0].procname = NULL; |
| | 887 | } |
| | 888 | |
| | 889 | /* |
| | 890 | * Sane defaults - nobody may create ping sockets. |
| | 891 | * Boot scripts should set this to distro-specific group. |
| | 892 | */ |
| | 893 | net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1); |
| | 894 | net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0); |
| | 895 | |
| | 896 | tcp_init_mem(net); |
| | 897 | |
| | 898 | net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); |
| | 899 | if (net->ipv4.ipv4_hdr == NULL) |
| | 900 | goto err_reg; |
| | 901 | |
| | 902 | return 0; |
| | 903 | |
| | 904 | err_reg: |
| | 905 | if (!net_eq(net, &init_net)) |
| | 906 | kfree(table); |
| | 907 | err_alloc: |
| | 908 | return -ENOMEM; |
| | 909 | } |
| | 910 | |
| | 911 | static __net_exit void ipv4_sysctl_exit_net(struct net *net) |
| | 912 | { |
| | 913 | struct ctl_table *table; |
| | 914 | |
| | 915 | table = net->ipv4.ipv4_hdr->ctl_table_arg; |
| | 916 | unregister_net_sysctl_table(net->ipv4.ipv4_hdr); |
| | 917 | kfree(table); |
| | 918 | } |
| | 919 | |
| | 920 | static __net_initdata struct pernet_operations ipv4_sysctl_ops = { |
| | 921 | .init = ipv4_sysctl_init_net, |
| | 922 | .exit = ipv4_sysctl_exit_net, |
| | 923 | }; |
| | 924 | |
| | 925 | static __init int sysctl_ipv4_init(void) |
| | 926 | { |
| | 927 | struct ctl_table_header *hdr; |
| | 928 | struct ctl_table *i; |
| | 929 | |
| | 930 | for (i = ipv4_table; i->procname; i++) { |
| | 931 | if (strcmp(i->procname, "ip_local_reserved_ports") == 0) { |
| | 932 | i->data = sysctl_local_reserved_ports; |
| | 933 | break; |
| | 934 | } |
| | 935 | } |
| | 936 | if (!i->procname) |
| | 937 | return -EINVAL; |
| | 938 | |
| | 939 | hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); |
| | 940 | if (hdr == NULL) |
| | 941 | return -ENOMEM; |
| | 942 | |
| | 943 | if (register_pernet_subsys(&ipv4_sysctl_ops)) { |
| | 944 | unregister_net_sysctl_table(hdr); |
| | 945 | return -ENOMEM; |
| | 946 | } |
| | 947 | |
| | 948 | return 0; |
| | 949 | } |
| | 950 | |
| | 951 | __initcall(sysctl_ipv4_init); |
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