| 1 | /* |
| 2 | * inet_diag.c Module for monitoring INET transport protocols sockets. |
| 3 | * |
| 4 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/fcntl.h> |
| 16 | #include <linux/random.h> |
| 17 | #include <linux/cache.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/time.h> |
| 20 | |
| 21 | #include <net/icmp.h> |
| 22 | #include <net/tcp.h> |
| 23 | #include <net/ipv6.h> |
| 24 | #include <net/inet_common.h> |
| 25 | #include <net/inet_connection_sock.h> |
| 26 | #include <net/inet_hashtables.h> |
| 27 | #include <net/inet_timewait_sock.h> |
| 28 | #include <net/inet6_hashtables.h> |
| 29 | #include <net/netlink.h> |
| 30 | |
| 31 | #include <linux/inet.h> |
| 32 | #include <linux/stddef.h> |
| 33 | |
| 34 | #include <linux/inet_diag.h> |
| 35 | |
| 36 | static const struct inet_diag_handler **inet_diag_table; |
| 37 | |
| 38 | struct inet_diag_entry { |
| 39 | __be32 *saddr; |
| 40 | __be32 *daddr; |
| 41 | u16 sport; |
| 42 | u16 dport; |
| 43 | u16 family; |
| 44 | u16 userlocks; |
| 45 | }; |
| 46 | |
| 47 | static struct sock *idiagnl; |
| 48 | |
| 49 | #define INET_DIAG_PUT(skb, attrtype, attrlen) \ |
| 50 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
| 51 | |
| 52 | static DEFINE_MUTEX(inet_diag_table_mutex); |
| 53 | |
| 54 | static const struct inet_diag_handler *inet_diag_lock_handler(int type) |
| 55 | { |
| 56 | if (!inet_diag_table[type]) |
| 57 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, |
| 58 | NETLINK_INET_DIAG, type); |
| 59 | |
| 60 | mutex_lock(&inet_diag_table_mutex); |
| 61 | if (!inet_diag_table[type]) |
| 62 | return ERR_PTR(-ENOENT); |
| 63 | |
| 64 | return inet_diag_table[type]; |
| 65 | } |
| 66 | |
| 67 | static inline void inet_diag_unlock_handler( |
| 68 | const struct inet_diag_handler *handler) |
| 69 | { |
| 70 | mutex_unlock(&inet_diag_table_mutex); |
| 71 | } |
| 72 | |
| 73 | static int inet_csk_diag_fill(struct sock *sk, |
| 74 | struct sk_buff *skb, |
| 75 | int ext, u32 pid, u32 seq, u16 nlmsg_flags, |
| 76 | const struct nlmsghdr *unlh) |
| 77 | { |
| 78 | const struct inet_sock *inet = inet_sk(sk); |
| 79 | const struct inet_connection_sock *icsk = inet_csk(sk); |
| 80 | struct inet_diag_msg *r; |
| 81 | struct nlmsghdr *nlh; |
| 82 | void *info = NULL; |
| 83 | struct inet_diag_meminfo *minfo = NULL; |
| 84 | unsigned char *b = skb_tail_pointer(skb); |
| 85 | const struct inet_diag_handler *handler; |
| 86 | |
| 87 | handler = inet_diag_table[unlh->nlmsg_type]; |
| 88 | BUG_ON(handler == NULL); |
| 89 | |
| 90 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
| 91 | nlh->nlmsg_flags = nlmsg_flags; |
| 92 | |
| 93 | r = NLMSG_DATA(nlh); |
| 94 | BUG_ON(sk->sk_state == TCP_TIME_WAIT); |
| 95 | |
| 96 | if (ext & (1 << (INET_DIAG_MEMINFO - 1))) |
| 97 | minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); |
| 98 | |
| 99 | if (ext & (1 << (INET_DIAG_INFO - 1))) |
| 100 | info = INET_DIAG_PUT(skb, INET_DIAG_INFO, |
| 101 | handler->idiag_info_size); |
| 102 | |
| 103 | if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { |
| 104 | const size_t len = strlen(icsk->icsk_ca_ops->name); |
| 105 | |
| 106 | strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), |
| 107 | icsk->icsk_ca_ops->name); |
| 108 | } |
| 109 | |
| 110 | r->idiag_family = sk->sk_family; |
| 111 | r->idiag_state = sk->sk_state; |
| 112 | r->idiag_timer = 0; |
| 113 | r->idiag_retrans = 0; |
| 114 | |
| 115 | r->id.idiag_if = sk->sk_bound_dev_if; |
| 116 | r->id.idiag_cookie[0] = (u32)(unsigned long)sk; |
| 117 | r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); |
| 118 | |
| 119 | r->id.idiag_sport = inet->sport; |
| 120 | r->id.idiag_dport = inet->dport; |
| 121 | r->id.idiag_src[0] = inet->rcv_saddr; |
| 122 | r->id.idiag_dst[0] = inet->daddr; |
| 123 | |
| 124 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 125 | if (r->idiag_family == AF_INET6) { |
| 126 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 127 | |
| 128 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, |
| 129 | &np->rcv_saddr); |
| 130 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
| 131 | &np->daddr); |
| 132 | } |
| 133 | #endif |
| 134 | |
| 135 | #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) |
| 136 | |
| 137 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
| 138 | r->idiag_timer = 1; |
| 139 | r->idiag_retrans = icsk->icsk_retransmits; |
| 140 | r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
| 141 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
| 142 | r->idiag_timer = 4; |
| 143 | r->idiag_retrans = icsk->icsk_probes_out; |
| 144 | r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
| 145 | } else if (timer_pending(&sk->sk_timer)) { |
| 146 | r->idiag_timer = 2; |
| 147 | r->idiag_retrans = icsk->icsk_probes_out; |
| 148 | r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); |
| 149 | } else { |
| 150 | r->idiag_timer = 0; |
| 151 | r->idiag_expires = 0; |
| 152 | } |
| 153 | #undef EXPIRES_IN_MS |
| 154 | |
| 155 | r->idiag_uid = sock_i_uid(sk); |
| 156 | r->idiag_inode = sock_i_ino(sk); |
| 157 | |
| 158 | if (minfo) { |
| 159 | minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); |
| 160 | minfo->idiag_wmem = sk->sk_wmem_queued; |
| 161 | minfo->idiag_fmem = sk->sk_forward_alloc; |
| 162 | minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); |
| 163 | } |
| 164 | |
| 165 | handler->idiag_get_info(sk, r, info); |
| 166 | |
| 167 | if (sk->sk_state < TCP_TIME_WAIT && |
| 168 | icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) |
| 169 | icsk->icsk_ca_ops->get_info(sk, ext, skb); |
| 170 | |
| 171 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| 172 | return skb->len; |
| 173 | |
| 174 | rtattr_failure: |
| 175 | nlmsg_failure: |
| 176 | nlmsg_trim(skb, b); |
| 177 | return -EMSGSIZE; |
| 178 | } |
| 179 | |
| 180 | static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, |
| 181 | struct sk_buff *skb, int ext, u32 pid, |
| 182 | u32 seq, u16 nlmsg_flags, |
| 183 | const struct nlmsghdr *unlh) |
| 184 | { |
| 185 | long tmo; |
| 186 | struct inet_diag_msg *r; |
| 187 | const unsigned char *previous_tail = skb_tail_pointer(skb); |
| 188 | struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, |
| 189 | unlh->nlmsg_type, sizeof(*r)); |
| 190 | |
| 191 | r = NLMSG_DATA(nlh); |
| 192 | BUG_ON(tw->tw_state != TCP_TIME_WAIT); |
| 193 | |
| 194 | nlh->nlmsg_flags = nlmsg_flags; |
| 195 | |
| 196 | tmo = tw->tw_ttd - jiffies; |
| 197 | if (tmo < 0) |
| 198 | tmo = 0; |
| 199 | |
| 200 | r->idiag_family = tw->tw_family; |
| 201 | r->idiag_state = tw->tw_state; |
| 202 | r->idiag_timer = 0; |
| 203 | r->idiag_retrans = 0; |
| 204 | r->id.idiag_if = tw->tw_bound_dev_if; |
| 205 | r->id.idiag_cookie[0] = (u32)(unsigned long)tw; |
| 206 | r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); |
| 207 | r->id.idiag_sport = tw->tw_sport; |
| 208 | r->id.idiag_dport = tw->tw_dport; |
| 209 | r->id.idiag_src[0] = tw->tw_rcv_saddr; |
| 210 | r->id.idiag_dst[0] = tw->tw_daddr; |
| 211 | r->idiag_state = tw->tw_substate; |
| 212 | r->idiag_timer = 3; |
| 213 | r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); |
| 214 | r->idiag_rqueue = 0; |
| 215 | r->idiag_wqueue = 0; |
| 216 | r->idiag_uid = 0; |
| 217 | r->idiag_inode = 0; |
| 218 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 219 | if (tw->tw_family == AF_INET6) { |
| 220 | const struct inet6_timewait_sock *tw6 = |
| 221 | inet6_twsk((struct sock *)tw); |
| 222 | |
| 223 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, |
| 224 | &tw6->tw_v6_rcv_saddr); |
| 225 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
| 226 | &tw6->tw_v6_daddr); |
| 227 | } |
| 228 | #endif |
| 229 | nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; |
| 230 | return skb->len; |
| 231 | nlmsg_failure: |
| 232 | nlmsg_trim(skb, previous_tail); |
| 233 | return -EMSGSIZE; |
| 234 | } |
| 235 | |
| 236 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| 237 | int ext, u32 pid, u32 seq, u16 nlmsg_flags, |
| 238 | const struct nlmsghdr *unlh) |
| 239 | { |
| 240 | if (sk->sk_state == TCP_TIME_WAIT) |
| 241 | return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, |
| 242 | skb, ext, pid, seq, nlmsg_flags, |
| 243 | unlh); |
| 244 | return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); |
| 245 | } |
| 246 | |
| 247 | static int inet_diag_get_exact(struct sk_buff *in_skb, |
| 248 | const struct nlmsghdr *nlh) |
| 249 | { |
| 250 | int err; |
| 251 | struct sock *sk; |
| 252 | struct inet_diag_req *req = NLMSG_DATA(nlh); |
| 253 | struct sk_buff *rep; |
| 254 | struct inet_hashinfo *hashinfo; |
| 255 | const struct inet_diag_handler *handler; |
| 256 | |
| 257 | handler = inet_diag_lock_handler(nlh->nlmsg_type); |
| 258 | if (IS_ERR(handler)) { |
| 259 | err = PTR_ERR(handler); |
| 260 | goto unlock; |
| 261 | } |
| 262 | |
| 263 | hashinfo = handler->idiag_hashinfo; |
| 264 | err = -EINVAL; |
| 265 | |
| 266 | if (req->idiag_family == AF_INET) { |
| 267 | sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], |
| 268 | req->id.idiag_dport, req->id.idiag_src[0], |
| 269 | req->id.idiag_sport, req->id.idiag_if); |
| 270 | } |
| 271 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 272 | else if (req->idiag_family == AF_INET6) { |
| 273 | sk = inet6_lookup(&init_net, hashinfo, |
| 274 | (struct in6_addr *)req->id.idiag_dst, |
| 275 | req->id.idiag_dport, |
| 276 | (struct in6_addr *)req->id.idiag_src, |
| 277 | req->id.idiag_sport, |
| 278 | req->id.idiag_if); |
| 279 | } |
| 280 | #endif |
| 281 | else { |
| 282 | goto unlock; |
| 283 | } |
| 284 | |
| 285 | err = -ENOENT; |
| 286 | if (sk == NULL) |
| 287 | goto unlock; |
| 288 | |
| 289 | err = -ESTALE; |
| 290 | if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || |
| 291 | req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && |
| 292 | ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || |
| 293 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) |
| 294 | goto out; |
| 295 | |
| 296 | err = -ENOMEM; |
| 297 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + |
| 298 | sizeof(struct inet_diag_meminfo) + |
| 299 | handler->idiag_info_size + 64)), |
| 300 | GFP_KERNEL); |
| 301 | if (!rep) |
| 302 | goto out; |
| 303 | |
| 304 | err = sk_diag_fill(sk, rep, req->idiag_ext, |
| 305 | NETLINK_CB(in_skb).pid, |
| 306 | nlh->nlmsg_seq, 0, nlh); |
| 307 | if (err < 0) { |
| 308 | WARN_ON(err == -EMSGSIZE); |
| 309 | kfree_skb(rep); |
| 310 | goto out; |
| 311 | } |
| 312 | err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, |
| 313 | MSG_DONTWAIT); |
| 314 | if (err > 0) |
| 315 | err = 0; |
| 316 | |
| 317 | out: |
| 318 | if (sk) { |
| 319 | if (sk->sk_state == TCP_TIME_WAIT) |
| 320 | inet_twsk_put((struct inet_timewait_sock *)sk); |
| 321 | else |
| 322 | sock_put(sk); |
| 323 | } |
| 324 | unlock: |
| 325 | inet_diag_unlock_handler(handler); |
| 326 | return err; |
| 327 | } |
| 328 | |
| 329 | static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) |
| 330 | { |
| 331 | int words = bits >> 5; |
| 332 | |
| 333 | bits &= 0x1f; |
| 334 | |
| 335 | if (words) { |
| 336 | if (memcmp(a1, a2, words << 2)) |
| 337 | return 0; |
| 338 | } |
| 339 | if (bits) { |
| 340 | __be32 w1, w2; |
| 341 | __be32 mask; |
| 342 | |
| 343 | w1 = a1[words]; |
| 344 | w2 = a2[words]; |
| 345 | |
| 346 | mask = htonl((0xffffffff) << (32 - bits)); |
| 347 | |
| 348 | if ((w1 ^ w2) & mask) |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | return 1; |
| 353 | } |
| 354 | |
| 355 | |
| 356 | static int inet_diag_bc_run(const void *bc, int len, |
| 357 | const struct inet_diag_entry *entry) |
| 358 | { |
| 359 | while (len > 0) { |
| 360 | int yes = 1; |
| 361 | const struct inet_diag_bc_op *op = bc; |
| 362 | |
| 363 | switch (op->code) { |
| 364 | case INET_DIAG_BC_NOP: |
| 365 | break; |
| 366 | case INET_DIAG_BC_JMP: |
| 367 | yes = 0; |
| 368 | break; |
| 369 | case INET_DIAG_BC_S_GE: |
| 370 | yes = entry->sport >= op[1].no; |
| 371 | break; |
| 372 | case INET_DIAG_BC_S_LE: |
| 373 | yes = entry->dport <= op[1].no; |
| 374 | break; |
| 375 | case INET_DIAG_BC_D_GE: |
| 376 | yes = entry->dport >= op[1].no; |
| 377 | break; |
| 378 | case INET_DIAG_BC_D_LE: |
| 379 | yes = entry->dport <= op[1].no; |
| 380 | break; |
| 381 | case INET_DIAG_BC_AUTO: |
| 382 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
| 383 | break; |
| 384 | case INET_DIAG_BC_S_COND: |
| 385 | case INET_DIAG_BC_D_COND: { |
| 386 | struct inet_diag_hostcond *cond; |
| 387 | __be32 *addr; |
| 388 | |
| 389 | cond = (struct inet_diag_hostcond *)(op + 1); |
| 390 | if (cond->port != -1 && |
| 391 | cond->port != (op->code == INET_DIAG_BC_S_COND ? |
| 392 | entry->sport : entry->dport)) { |
| 393 | yes = 0; |
| 394 | break; |
| 395 | } |
| 396 | |
| 397 | if (cond->prefix_len == 0) |
| 398 | break; |
| 399 | |
| 400 | if (op->code == INET_DIAG_BC_S_COND) |
| 401 | addr = entry->saddr; |
| 402 | else |
| 403 | addr = entry->daddr; |
| 404 | |
| 405 | if (bitstring_match(addr, cond->addr, |
| 406 | cond->prefix_len)) |
| 407 | break; |
| 408 | if (entry->family == AF_INET6 && |
| 409 | cond->family == AF_INET) { |
| 410 | if (addr[0] == 0 && addr[1] == 0 && |
| 411 | addr[2] == htonl(0xffff) && |
| 412 | bitstring_match(addr + 3, cond->addr, |
| 413 | cond->prefix_len)) |
| 414 | break; |
| 415 | } |
| 416 | yes = 0; |
| 417 | break; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | if (yes) { |
| 422 | len -= op->yes; |
| 423 | bc += op->yes; |
| 424 | } else { |
| 425 | len -= op->no; |
| 426 | bc += op->no; |
| 427 | } |
| 428 | } |
| 429 | return (len == 0); |
| 430 | } |
| 431 | |
| 432 | static int valid_cc(const void *bc, int len, int cc) |
| 433 | { |
| 434 | while (len >= 0) { |
| 435 | const struct inet_diag_bc_op *op = bc; |
| 436 | |
| 437 | if (cc > len) |
| 438 | return 0; |
| 439 | if (cc == len) |
| 440 | return 1; |
| 441 | if (op->yes < 4) |
| 442 | return 0; |
| 443 | len -= op->yes; |
| 444 | bc += op->yes; |
| 445 | } |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) |
| 450 | { |
| 451 | const unsigned char *bc = bytecode; |
| 452 | int len = bytecode_len; |
| 453 | |
| 454 | while (len > 0) { |
| 455 | struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; |
| 456 | |
| 457 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); |
| 458 | switch (op->code) { |
| 459 | case INET_DIAG_BC_AUTO: |
| 460 | case INET_DIAG_BC_S_COND: |
| 461 | case INET_DIAG_BC_D_COND: |
| 462 | case INET_DIAG_BC_S_GE: |
| 463 | case INET_DIAG_BC_S_LE: |
| 464 | case INET_DIAG_BC_D_GE: |
| 465 | case INET_DIAG_BC_D_LE: |
| 466 | if (op->yes < 4 || op->yes > len + 4) |
| 467 | return -EINVAL; |
| 468 | case INET_DIAG_BC_JMP: |
| 469 | if (op->no < 4 || op->no > len + 4) |
| 470 | return -EINVAL; |
| 471 | if (op->no < len && |
| 472 | !valid_cc(bytecode, bytecode_len, len - op->no)) |
| 473 | return -EINVAL; |
| 474 | break; |
| 475 | case INET_DIAG_BC_NOP: |
| 476 | if (op->yes < 4 || op->yes > len + 4) |
| 477 | return -EINVAL; |
| 478 | break; |
| 479 | default: |
| 480 | return -EINVAL; |
| 481 | } |
| 482 | bc += op->yes; |
| 483 | len -= op->yes; |
| 484 | } |
| 485 | return len == 0 ? 0 : -EINVAL; |
| 486 | } |
| 487 | |
| 488 | static int inet_csk_diag_dump(struct sock *sk, |
| 489 | struct sk_buff *skb, |
| 490 | struct netlink_callback *cb) |
| 491 | { |
| 492 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
| 493 | |
| 494 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
| 495 | struct inet_diag_entry entry; |
| 496 | struct rtattr *bc = (struct rtattr *)(r + 1); |
| 497 | struct inet_sock *inet = inet_sk(sk); |
| 498 | |
| 499 | entry.family = sk->sk_family; |
| 500 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 501 | if (entry.family == AF_INET6) { |
| 502 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 503 | |
| 504 | entry.saddr = np->rcv_saddr.s6_addr32; |
| 505 | entry.daddr = np->daddr.s6_addr32; |
| 506 | } else |
| 507 | #endif |
| 508 | { |
| 509 | entry.saddr = &inet->rcv_saddr; |
| 510 | entry.daddr = &inet->daddr; |
| 511 | } |
| 512 | entry.sport = inet->num; |
| 513 | entry.dport = ntohs(inet->dport); |
| 514 | entry.userlocks = sk->sk_userlocks; |
| 515 | |
| 516 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | return inet_csk_diag_fill(sk, skb, r->idiag_ext, |
| 521 | NETLINK_CB(cb->skb).pid, |
| 522 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
| 523 | } |
| 524 | |
| 525 | static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, |
| 526 | struct sk_buff *skb, |
| 527 | struct netlink_callback *cb) |
| 528 | { |
| 529 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
| 530 | |
| 531 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
| 532 | struct inet_diag_entry entry; |
| 533 | struct rtattr *bc = (struct rtattr *)(r + 1); |
| 534 | |
| 535 | entry.family = tw->tw_family; |
| 536 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 537 | if (tw->tw_family == AF_INET6) { |
| 538 | struct inet6_timewait_sock *tw6 = |
| 539 | inet6_twsk((struct sock *)tw); |
| 540 | entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; |
| 541 | entry.daddr = tw6->tw_v6_daddr.s6_addr32; |
| 542 | } else |
| 543 | #endif |
| 544 | { |
| 545 | entry.saddr = &tw->tw_rcv_saddr; |
| 546 | entry.daddr = &tw->tw_daddr; |
| 547 | } |
| 548 | entry.sport = tw->tw_num; |
| 549 | entry.dport = ntohs(tw->tw_dport); |
| 550 | entry.userlocks = 0; |
| 551 | |
| 552 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | return inet_twsk_diag_fill(tw, skb, r->idiag_ext, |
| 557 | NETLINK_CB(cb->skb).pid, |
| 558 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
| 559 | } |
| 560 | |
| 561 | static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, |
| 562 | struct request_sock *req, u32 pid, u32 seq, |
| 563 | const struct nlmsghdr *unlh) |
| 564 | { |
| 565 | const struct inet_request_sock *ireq = inet_rsk(req); |
| 566 | struct inet_sock *inet = inet_sk(sk); |
| 567 | unsigned char *b = skb_tail_pointer(skb); |
| 568 | struct inet_diag_msg *r; |
| 569 | struct nlmsghdr *nlh; |
| 570 | long tmo; |
| 571 | |
| 572 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
| 573 | nlh->nlmsg_flags = NLM_F_MULTI; |
| 574 | r = NLMSG_DATA(nlh); |
| 575 | |
| 576 | r->idiag_family = sk->sk_family; |
| 577 | r->idiag_state = TCP_SYN_RECV; |
| 578 | r->idiag_timer = 1; |
| 579 | r->idiag_retrans = req->retrans; |
| 580 | |
| 581 | r->id.idiag_if = sk->sk_bound_dev_if; |
| 582 | r->id.idiag_cookie[0] = (u32)(unsigned long)req; |
| 583 | r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); |
| 584 | |
| 585 | tmo = req->expires - jiffies; |
| 586 | if (tmo < 0) |
| 587 | tmo = 0; |
| 588 | |
| 589 | r->id.idiag_sport = inet->sport; |
| 590 | r->id.idiag_dport = ireq->rmt_port; |
| 591 | r->id.idiag_src[0] = ireq->loc_addr; |
| 592 | r->id.idiag_dst[0] = ireq->rmt_addr; |
| 593 | r->idiag_expires = jiffies_to_msecs(tmo); |
| 594 | r->idiag_rqueue = 0; |
| 595 | r->idiag_wqueue = 0; |
| 596 | r->idiag_uid = sock_i_uid(sk); |
| 597 | r->idiag_inode = 0; |
| 598 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 599 | if (r->idiag_family == AF_INET6) { |
| 600 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, |
| 601 | &inet6_rsk(req)->loc_addr); |
| 602 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
| 603 | &inet6_rsk(req)->rmt_addr); |
| 604 | } |
| 605 | #endif |
| 606 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| 607 | |
| 608 | return skb->len; |
| 609 | |
| 610 | nlmsg_failure: |
| 611 | nlmsg_trim(skb, b); |
| 612 | return -1; |
| 613 | } |
| 614 | |
| 615 | static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, |
| 616 | struct netlink_callback *cb) |
| 617 | { |
| 618 | struct inet_diag_entry entry; |
| 619 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
| 620 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 621 | struct listen_sock *lopt; |
| 622 | struct rtattr *bc = NULL; |
| 623 | struct inet_sock *inet = inet_sk(sk); |
| 624 | int j, s_j; |
| 625 | int reqnum, s_reqnum; |
| 626 | int err = 0; |
| 627 | |
| 628 | s_j = cb->args[3]; |
| 629 | s_reqnum = cb->args[4]; |
| 630 | |
| 631 | if (s_j > 0) |
| 632 | s_j--; |
| 633 | |
| 634 | entry.family = sk->sk_family; |
| 635 | |
| 636 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 637 | |
| 638 | lopt = icsk->icsk_accept_queue.listen_opt; |
| 639 | if (!lopt || !lopt->qlen) |
| 640 | goto out; |
| 641 | |
| 642 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
| 643 | bc = (struct rtattr *)(r + 1); |
| 644 | entry.sport = inet->num; |
| 645 | entry.userlocks = sk->sk_userlocks; |
| 646 | } |
| 647 | |
| 648 | for (j = s_j; j < lopt->nr_table_entries; j++) { |
| 649 | struct request_sock *req, *head = lopt->syn_table[j]; |
| 650 | |
| 651 | reqnum = 0; |
| 652 | for (req = head; req; reqnum++, req = req->dl_next) { |
| 653 | struct inet_request_sock *ireq = inet_rsk(req); |
| 654 | |
| 655 | if (reqnum < s_reqnum) |
| 656 | continue; |
| 657 | if (r->id.idiag_dport != ireq->rmt_port && |
| 658 | r->id.idiag_dport) |
| 659 | continue; |
| 660 | |
| 661 | if (bc) { |
| 662 | entry.saddr = |
| 663 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 664 | (entry.family == AF_INET6) ? |
| 665 | inet6_rsk(req)->loc_addr.s6_addr32 : |
| 666 | #endif |
| 667 | &ireq->loc_addr; |
| 668 | entry.daddr = |
| 669 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 670 | (entry.family == AF_INET6) ? |
| 671 | inet6_rsk(req)->rmt_addr.s6_addr32 : |
| 672 | #endif |
| 673 | &ireq->rmt_addr; |
| 674 | entry.dport = ntohs(ireq->rmt_port); |
| 675 | |
| 676 | if (!inet_diag_bc_run(RTA_DATA(bc), |
| 677 | RTA_PAYLOAD(bc), &entry)) |
| 678 | continue; |
| 679 | } |
| 680 | |
| 681 | err = inet_diag_fill_req(skb, sk, req, |
| 682 | NETLINK_CB(cb->skb).pid, |
| 683 | cb->nlh->nlmsg_seq, cb->nlh); |
| 684 | if (err < 0) { |
| 685 | cb->args[3] = j + 1; |
| 686 | cb->args[4] = reqnum; |
| 687 | goto out; |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | s_reqnum = 0; |
| 692 | } |
| 693 | |
| 694 | out: |
| 695 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 696 | |
| 697 | return err; |
| 698 | } |
| 699 | |
| 700 | static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 701 | { |
| 702 | int i, num; |
| 703 | int s_i, s_num; |
| 704 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
| 705 | const struct inet_diag_handler *handler; |
| 706 | struct inet_hashinfo *hashinfo; |
| 707 | |
| 708 | handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); |
| 709 | if (IS_ERR(handler)) |
| 710 | goto unlock; |
| 711 | |
| 712 | hashinfo = handler->idiag_hashinfo; |
| 713 | |
| 714 | s_i = cb->args[1]; |
| 715 | s_num = num = cb->args[2]; |
| 716 | |
| 717 | if (cb->args[0] == 0) { |
| 718 | if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) |
| 719 | goto skip_listen_ht; |
| 720 | |
| 721 | inet_listen_lock(hashinfo); |
| 722 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
| 723 | struct sock *sk; |
| 724 | struct hlist_node *node; |
| 725 | |
| 726 | num = 0; |
| 727 | sk_for_each(sk, node, &hashinfo->listening_hash[i]) { |
| 728 | struct inet_sock *inet = inet_sk(sk); |
| 729 | |
| 730 | if (num < s_num) { |
| 731 | num++; |
| 732 | continue; |
| 733 | } |
| 734 | |
| 735 | if (r->id.idiag_sport != inet->sport && |
| 736 | r->id.idiag_sport) |
| 737 | goto next_listen; |
| 738 | |
| 739 | if (!(r->idiag_states & TCPF_LISTEN) || |
| 740 | r->id.idiag_dport || |
| 741 | cb->args[3] > 0) |
| 742 | goto syn_recv; |
| 743 | |
| 744 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
| 745 | inet_listen_unlock(hashinfo); |
| 746 | goto done; |
| 747 | } |
| 748 | |
| 749 | syn_recv: |
| 750 | if (!(r->idiag_states & TCPF_SYN_RECV)) |
| 751 | goto next_listen; |
| 752 | |
| 753 | if (inet_diag_dump_reqs(skb, sk, cb) < 0) { |
| 754 | inet_listen_unlock(hashinfo); |
| 755 | goto done; |
| 756 | } |
| 757 | |
| 758 | next_listen: |
| 759 | cb->args[3] = 0; |
| 760 | cb->args[4] = 0; |
| 761 | ++num; |
| 762 | } |
| 763 | |
| 764 | s_num = 0; |
| 765 | cb->args[3] = 0; |
| 766 | cb->args[4] = 0; |
| 767 | } |
| 768 | inet_listen_unlock(hashinfo); |
| 769 | skip_listen_ht: |
| 770 | cb->args[0] = 1; |
| 771 | s_i = num = s_num = 0; |
| 772 | } |
| 773 | |
| 774 | if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) |
| 775 | goto unlock; |
| 776 | |
| 777 | for (i = s_i; i < hashinfo->ehash_size; i++) { |
| 778 | struct inet_ehash_bucket *head = &hashinfo->ehash[i]; |
| 779 | rwlock_t *lock = inet_ehash_lockp(hashinfo, i); |
| 780 | struct sock *sk; |
| 781 | struct hlist_node *node; |
| 782 | |
| 783 | num = 0; |
| 784 | |
| 785 | if (hlist_empty(&head->chain) && hlist_empty(&head->twchain)) |
| 786 | continue; |
| 787 | |
| 788 | if (i > s_i) |
| 789 | s_num = 0; |
| 790 | |
| 791 | read_lock_bh(lock); |
| 792 | sk_for_each(sk, node, &head->chain) { |
| 793 | struct inet_sock *inet = inet_sk(sk); |
| 794 | |
| 795 | if (num < s_num) |
| 796 | goto next_normal; |
| 797 | if (!(r->idiag_states & (1 << sk->sk_state))) |
| 798 | goto next_normal; |
| 799 | if (r->id.idiag_sport != inet->sport && |
| 800 | r->id.idiag_sport) |
| 801 | goto next_normal; |
| 802 | if (r->id.idiag_dport != inet->dport && |
| 803 | r->id.idiag_dport) |
| 804 | goto next_normal; |
| 805 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
| 806 | read_unlock_bh(lock); |
| 807 | goto done; |
| 808 | } |
| 809 | next_normal: |
| 810 | ++num; |
| 811 | } |
| 812 | |
| 813 | if (r->idiag_states & TCPF_TIME_WAIT) { |
| 814 | struct inet_timewait_sock *tw; |
| 815 | |
| 816 | inet_twsk_for_each(tw, node, |
| 817 | &head->twchain) { |
| 818 | |
| 819 | if (num < s_num) |
| 820 | goto next_dying; |
| 821 | if (r->id.idiag_sport != tw->tw_sport && |
| 822 | r->id.idiag_sport) |
| 823 | goto next_dying; |
| 824 | if (r->id.idiag_dport != tw->tw_dport && |
| 825 | r->id.idiag_dport) |
| 826 | goto next_dying; |
| 827 | if (inet_twsk_diag_dump(tw, skb, cb) < 0) { |
| 828 | read_unlock_bh(lock); |
| 829 | goto done; |
| 830 | } |
| 831 | next_dying: |
| 832 | ++num; |
| 833 | } |
| 834 | } |
| 835 | read_unlock_bh(lock); |
| 836 | } |
| 837 | |
| 838 | done: |
| 839 | cb->args[1] = i; |
| 840 | cb->args[2] = num; |
| 841 | unlock: |
| 842 | inet_diag_unlock_handler(handler); |
| 843 | return skb->len; |
| 844 | } |
| 845 | |
| 846 | static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 847 | { |
| 848 | int hdrlen = sizeof(struct inet_diag_req); |
| 849 | |
| 850 | if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
| 851 | nlmsg_len(nlh) < hdrlen) |
| 852 | return -EINVAL; |
| 853 | |
| 854 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 855 | if (nlmsg_attrlen(nlh, hdrlen)) { |
| 856 | struct nlattr *attr; |
| 857 | |
| 858 | attr = nlmsg_find_attr(nlh, hdrlen, |
| 859 | INET_DIAG_REQ_BYTECODE); |
| 860 | if (attr == NULL || |
| 861 | nla_len(attr) < sizeof(struct inet_diag_bc_op) || |
| 862 | inet_diag_bc_audit(nla_data(attr), nla_len(attr))) |
| 863 | return -EINVAL; |
| 864 | } |
| 865 | |
| 866 | return netlink_dump_start(idiagnl, skb, nlh, |
| 867 | inet_diag_dump, NULL); |
| 868 | } |
| 869 | |
| 870 | return inet_diag_get_exact(skb, nlh); |
| 871 | } |
| 872 | |
| 873 | static DEFINE_MUTEX(inet_diag_mutex); |
| 874 | |
| 875 | static void inet_diag_rcv(struct sk_buff *skb) |
| 876 | { |
| 877 | mutex_lock(&inet_diag_mutex); |
| 878 | netlink_rcv_skb(skb, &inet_diag_rcv_msg); |
| 879 | mutex_unlock(&inet_diag_mutex); |
| 880 | } |
| 881 | |
| 882 | int inet_diag_register(const struct inet_diag_handler *h) |
| 883 | { |
| 884 | const __u16 type = h->idiag_type; |
| 885 | int err = -EINVAL; |
| 886 | |
| 887 | if (type >= INET_DIAG_GETSOCK_MAX) |
| 888 | goto out; |
| 889 | |
| 890 | mutex_lock(&inet_diag_table_mutex); |
| 891 | err = -EEXIST; |
| 892 | if (inet_diag_table[type] == NULL) { |
| 893 | inet_diag_table[type] = h; |
| 894 | err = 0; |
| 895 | } |
| 896 | mutex_unlock(&inet_diag_table_mutex); |
| 897 | out: |
| 898 | return err; |
| 899 | } |
| 900 | EXPORT_SYMBOL_GPL(inet_diag_register); |
| 901 | |
| 902 | void inet_diag_unregister(const struct inet_diag_handler *h) |
| 903 | { |
| 904 | const __u16 type = h->idiag_type; |
| 905 | |
| 906 | if (type >= INET_DIAG_GETSOCK_MAX) |
| 907 | return; |
| 908 | |
| 909 | mutex_lock(&inet_diag_table_mutex); |
| 910 | inet_diag_table[type] = NULL; |
| 911 | mutex_unlock(&inet_diag_table_mutex); |
| 912 | } |
| 913 | EXPORT_SYMBOL_GPL(inet_diag_unregister); |
| 914 | |
| 915 | static int __init inet_diag_init(void) |
| 916 | { |
| 917 | const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * |
| 918 | sizeof(struct inet_diag_handler *)); |
| 919 | int err = -ENOMEM; |
| 920 | |
| 921 | inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
| 922 | if (!inet_diag_table) |
| 923 | goto out; |
| 924 | |
| 925 | idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, |
| 926 | inet_diag_rcv, NULL, THIS_MODULE); |
| 927 | if (idiagnl == NULL) |
| 928 | goto out_free_table; |
| 929 | err = 0; |
| 930 | out: |
| 931 | return err; |
| 932 | out_free_table: |
| 933 | kfree(inet_diag_table); |
| 934 | goto out; |
| 935 | } |
| 936 | |
| 937 | static void __exit inet_diag_exit(void) |
| 938 | { |
| 939 | netlink_kernel_release(idiagnl); |
| 940 | kfree(inet_diag_table); |
| 941 | } |
| 942 | |
| 943 | module_init(inet_diag_init); |
| 944 | module_exit(inet_diag_exit); |
| 945 | MODULE_LICENSE("GPL"); |
| 946 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); |