| 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/slab.h> |
| 18 | #include <linux/cache.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/time.h> |
| 21 | |
| 22 | #include <net/icmp.h> |
| 23 | #include <net/tcp.h> |
| 24 | #include <net/ipv6.h> |
| 25 | #include <net/inet_common.h> |
| 26 | #include <net/inet_connection_sock.h> |
| 27 | #include <net/inet_hashtables.h> |
| 28 | #include <net/inet_timewait_sock.h> |
| 29 | #include <net/inet6_hashtables.h> |
| 30 | #include <net/netlink.h> |
| 31 | |
| 32 | #include <linux/inet.h> |
| 33 | #include <linux/stddef.h> |
| 34 | |
| 35 | #include <linux/inet_diag.h> |
| 36 | #include <linux/sock_diag.h> |
| 37 | |
| 38 | static const struct inet_diag_handler **inet_diag_table; |
| 39 | |
| 40 | struct inet_diag_entry { |
| 41 | const __be32 *saddr; |
| 42 | const __be32 *daddr; |
| 43 | u16 sport; |
| 44 | u16 dport; |
| 45 | u16 family; |
| 46 | u16 userlocks; |
| 47 | u32 ifindex; |
| 48 | u32 mark; |
| 49 | }; |
| 50 | |
| 51 | static DEFINE_MUTEX(inet_diag_table_mutex); |
| 52 | |
| 53 | static const struct inet_diag_handler *inet_diag_lock_handler(int proto) |
| 54 | { |
| 55 | if (!inet_diag_table[proto]) |
| 56 | request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, |
| 57 | NETLINK_SOCK_DIAG, AF_INET, proto); |
| 58 | |
| 59 | mutex_lock(&inet_diag_table_mutex); |
| 60 | if (!inet_diag_table[proto]) |
| 61 | return ERR_PTR(-ENOENT); |
| 62 | |
| 63 | return inet_diag_table[proto]; |
| 64 | } |
| 65 | |
| 66 | static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) |
| 67 | { |
| 68 | mutex_unlock(&inet_diag_table_mutex); |
| 69 | } |
| 70 | |
| 71 | void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) |
| 72 | { |
| 73 | r->idiag_family = sk->sk_family; |
| 74 | |
| 75 | r->id.idiag_sport = htons(sk->sk_num); |
| 76 | r->id.idiag_dport = sk->sk_dport; |
| 77 | r->id.idiag_if = sk->sk_bound_dev_if; |
| 78 | sock_diag_save_cookie(sk, r->id.idiag_cookie); |
| 79 | |
| 80 | #if IS_ENABLED(CONFIG_IPV6) |
| 81 | if (sk->sk_family == AF_INET6) { |
| 82 | *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; |
| 83 | *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; |
| 84 | } else |
| 85 | #endif |
| 86 | { |
| 87 | memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); |
| 88 | memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); |
| 89 | |
| 90 | r->id.idiag_src[0] = sk->sk_rcv_saddr; |
| 91 | r->id.idiag_dst[0] = sk->sk_daddr; |
| 92 | } |
| 93 | } |
| 94 | EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); |
| 95 | |
| 96 | static size_t inet_sk_attr_size(void) |
| 97 | { |
| 98 | return nla_total_size(sizeof(struct tcp_info)) |
| 99 | + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ |
| 100 | + nla_total_size(1) /* INET_DIAG_TOS */ |
| 101 | + nla_total_size(1) /* INET_DIAG_TCLASS */ |
| 102 | + nla_total_size(4) /* INET_DIAG_MARK */ |
| 103 | + nla_total_size(sizeof(struct inet_diag_meminfo)) |
| 104 | + nla_total_size(sizeof(struct inet_diag_msg)) |
| 105 | + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) |
| 106 | + nla_total_size(TCP_CA_NAME_MAX) |
| 107 | + nla_total_size(sizeof(struct tcpvegas_info)) |
| 108 | + 64; |
| 109 | } |
| 110 | |
| 111 | int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, |
| 112 | struct inet_diag_msg *r, int ext, |
| 113 | struct user_namespace *user_ns, |
| 114 | bool net_admin) |
| 115 | { |
| 116 | const struct inet_sock *inet = inet_sk(sk); |
| 117 | |
| 118 | if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) |
| 119 | goto errout; |
| 120 | |
| 121 | /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, |
| 122 | * hence this needs to be included regardless of socket family. |
| 123 | */ |
| 124 | if (ext & (1 << (INET_DIAG_TOS - 1))) |
| 125 | if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) |
| 126 | goto errout; |
| 127 | |
| 128 | #if IS_ENABLED(CONFIG_IPV6) |
| 129 | if (r->idiag_family == AF_INET6) { |
| 130 | if (ext & (1 << (INET_DIAG_TCLASS - 1))) |
| 131 | if (nla_put_u8(skb, INET_DIAG_TCLASS, |
| 132 | inet6_sk(sk)->tclass) < 0) |
| 133 | goto errout; |
| 134 | |
| 135 | if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && |
| 136 | nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) |
| 137 | goto errout; |
| 138 | } |
| 139 | #endif |
| 140 | |
| 141 | if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) |
| 142 | goto errout; |
| 143 | |
| 144 | r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); |
| 145 | r->idiag_inode = sock_i_ino(sk); |
| 146 | |
| 147 | return 0; |
| 148 | errout: |
| 149 | return 1; |
| 150 | } |
| 151 | EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); |
| 152 | |
| 153 | int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, |
| 154 | struct sk_buff *skb, const struct inet_diag_req_v2 *req, |
| 155 | struct user_namespace *user_ns, |
| 156 | u32 portid, u32 seq, u16 nlmsg_flags, |
| 157 | const struct nlmsghdr *unlh, |
| 158 | bool net_admin) |
| 159 | { |
| 160 | const struct tcp_congestion_ops *ca_ops; |
| 161 | const struct inet_diag_handler *handler; |
| 162 | int ext = req->idiag_ext; |
| 163 | struct inet_diag_msg *r; |
| 164 | struct nlmsghdr *nlh; |
| 165 | struct nlattr *attr; |
| 166 | void *info = NULL; |
| 167 | |
| 168 | handler = inet_diag_table[req->sdiag_protocol]; |
| 169 | BUG_ON(!handler); |
| 170 | |
| 171 | nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| 172 | nlmsg_flags); |
| 173 | if (!nlh) |
| 174 | return -EMSGSIZE; |
| 175 | |
| 176 | r = nlmsg_data(nlh); |
| 177 | BUG_ON(!sk_fullsock(sk)); |
| 178 | |
| 179 | inet_diag_msg_common_fill(r, sk); |
| 180 | r->idiag_state = sk->sk_state; |
| 181 | r->idiag_timer = 0; |
| 182 | r->idiag_retrans = 0; |
| 183 | |
| 184 | if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) |
| 185 | goto errout; |
| 186 | |
| 187 | if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { |
| 188 | struct inet_diag_meminfo minfo = { |
| 189 | .idiag_rmem = sk_rmem_alloc_get(sk), |
| 190 | .idiag_wmem = sk->sk_wmem_queued, |
| 191 | .idiag_fmem = sk->sk_forward_alloc, |
| 192 | .idiag_tmem = sk_wmem_alloc_get(sk), |
| 193 | }; |
| 194 | |
| 195 | if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) |
| 196 | goto errout; |
| 197 | } |
| 198 | |
| 199 | if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) |
| 200 | if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) |
| 201 | goto errout; |
| 202 | |
| 203 | if (!icsk) { |
| 204 | handler->idiag_get_info(sk, r, NULL); |
| 205 | goto out; |
| 206 | } |
| 207 | |
| 208 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
| 209 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || |
| 210 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
| 211 | r->idiag_timer = 1; |
| 212 | r->idiag_retrans = icsk->icsk_retransmits; |
| 213 | r->idiag_expires = |
| 214 | jiffies_to_msecs(icsk->icsk_timeout - jiffies); |
| 215 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
| 216 | r->idiag_timer = 4; |
| 217 | r->idiag_retrans = icsk->icsk_probes_out; |
| 218 | r->idiag_expires = |
| 219 | jiffies_to_msecs(icsk->icsk_timeout - jiffies); |
| 220 | } else if (timer_pending(&sk->sk_timer)) { |
| 221 | r->idiag_timer = 2; |
| 222 | r->idiag_retrans = icsk->icsk_probes_out; |
| 223 | r->idiag_expires = |
| 224 | jiffies_to_msecs(sk->sk_timer.expires - jiffies); |
| 225 | } else { |
| 226 | r->idiag_timer = 0; |
| 227 | r->idiag_expires = 0; |
| 228 | } |
| 229 | |
| 230 | if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { |
| 231 | attr = nla_reserve_64bit(skb, INET_DIAG_INFO, |
| 232 | handler->idiag_info_size, |
| 233 | INET_DIAG_PAD); |
| 234 | if (!attr) |
| 235 | goto errout; |
| 236 | |
| 237 | info = nla_data(attr); |
| 238 | } |
| 239 | |
| 240 | if (ext & (1 << (INET_DIAG_CONG - 1))) { |
| 241 | int err = 0; |
| 242 | |
| 243 | rcu_read_lock(); |
| 244 | ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
| 245 | if (ca_ops) |
| 246 | err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); |
| 247 | rcu_read_unlock(); |
| 248 | if (err < 0) |
| 249 | goto errout; |
| 250 | } |
| 251 | |
| 252 | handler->idiag_get_info(sk, r, info); |
| 253 | |
| 254 | if (sk->sk_state < TCP_TIME_WAIT) { |
| 255 | union tcp_cc_info info; |
| 256 | size_t sz = 0; |
| 257 | int attr; |
| 258 | |
| 259 | rcu_read_lock(); |
| 260 | ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
| 261 | if (ca_ops && ca_ops->get_info) |
| 262 | sz = ca_ops->get_info(sk, ext, &attr, &info); |
| 263 | rcu_read_unlock(); |
| 264 | if (sz && nla_put(skb, attr, sz, &info) < 0) |
| 265 | goto errout; |
| 266 | } |
| 267 | |
| 268 | out: |
| 269 | nlmsg_end(skb, nlh); |
| 270 | return 0; |
| 271 | |
| 272 | errout: |
| 273 | nlmsg_cancel(skb, nlh); |
| 274 | return -EMSGSIZE; |
| 275 | } |
| 276 | EXPORT_SYMBOL_GPL(inet_sk_diag_fill); |
| 277 | |
| 278 | static int inet_csk_diag_fill(struct sock *sk, |
| 279 | struct sk_buff *skb, |
| 280 | const struct inet_diag_req_v2 *req, |
| 281 | struct user_namespace *user_ns, |
| 282 | u32 portid, u32 seq, u16 nlmsg_flags, |
| 283 | const struct nlmsghdr *unlh, |
| 284 | bool net_admin) |
| 285 | { |
| 286 | return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, |
| 287 | portid, seq, nlmsg_flags, unlh, net_admin); |
| 288 | } |
| 289 | |
| 290 | static int inet_twsk_diag_fill(struct sock *sk, |
| 291 | struct sk_buff *skb, |
| 292 | u32 portid, u32 seq, u16 nlmsg_flags, |
| 293 | const struct nlmsghdr *unlh) |
| 294 | { |
| 295 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 296 | struct inet_diag_msg *r; |
| 297 | struct nlmsghdr *nlh; |
| 298 | long tmo; |
| 299 | |
| 300 | nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| 301 | nlmsg_flags); |
| 302 | if (!nlh) |
| 303 | return -EMSGSIZE; |
| 304 | |
| 305 | r = nlmsg_data(nlh); |
| 306 | BUG_ON(tw->tw_state != TCP_TIME_WAIT); |
| 307 | |
| 308 | tmo = tw->tw_timer.expires - jiffies; |
| 309 | if (tmo < 0) |
| 310 | tmo = 0; |
| 311 | |
| 312 | inet_diag_msg_common_fill(r, sk); |
| 313 | r->idiag_retrans = 0; |
| 314 | |
| 315 | r->idiag_state = tw->tw_substate; |
| 316 | r->idiag_timer = 3; |
| 317 | r->idiag_expires = jiffies_to_msecs(tmo); |
| 318 | r->idiag_rqueue = 0; |
| 319 | r->idiag_wqueue = 0; |
| 320 | r->idiag_uid = 0; |
| 321 | r->idiag_inode = 0; |
| 322 | |
| 323 | nlmsg_end(skb, nlh); |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, |
| 328 | u32 portid, u32 seq, u16 nlmsg_flags, |
| 329 | const struct nlmsghdr *unlh, bool net_admin) |
| 330 | { |
| 331 | struct request_sock *reqsk = inet_reqsk(sk); |
| 332 | struct inet_diag_msg *r; |
| 333 | struct nlmsghdr *nlh; |
| 334 | long tmo; |
| 335 | |
| 336 | nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| 337 | nlmsg_flags); |
| 338 | if (!nlh) |
| 339 | return -EMSGSIZE; |
| 340 | |
| 341 | r = nlmsg_data(nlh); |
| 342 | inet_diag_msg_common_fill(r, sk); |
| 343 | r->idiag_state = TCP_SYN_RECV; |
| 344 | r->idiag_timer = 1; |
| 345 | r->idiag_retrans = reqsk->num_retrans; |
| 346 | |
| 347 | BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != |
| 348 | offsetof(struct sock, sk_cookie)); |
| 349 | |
| 350 | tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; |
| 351 | r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; |
| 352 | r->idiag_rqueue = 0; |
| 353 | r->idiag_wqueue = 0; |
| 354 | r->idiag_uid = 0; |
| 355 | r->idiag_inode = 0; |
| 356 | |
| 357 | if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, |
| 358 | inet_rsk(reqsk)->ir_mark)) |
| 359 | return -EMSGSIZE; |
| 360 | |
| 361 | nlmsg_end(skb, nlh); |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| 366 | const struct inet_diag_req_v2 *r, |
| 367 | struct user_namespace *user_ns, |
| 368 | u32 portid, u32 seq, u16 nlmsg_flags, |
| 369 | const struct nlmsghdr *unlh, bool net_admin) |
| 370 | { |
| 371 | if (sk->sk_state == TCP_TIME_WAIT) |
| 372 | return inet_twsk_diag_fill(sk, skb, portid, seq, |
| 373 | nlmsg_flags, unlh); |
| 374 | |
| 375 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
| 376 | return inet_req_diag_fill(sk, skb, portid, seq, |
| 377 | nlmsg_flags, unlh, net_admin); |
| 378 | |
| 379 | return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, |
| 380 | nlmsg_flags, unlh, net_admin); |
| 381 | } |
| 382 | |
| 383 | struct sock *inet_diag_find_one_icsk(struct net *net, |
| 384 | struct inet_hashinfo *hashinfo, |
| 385 | const struct inet_diag_req_v2 *req) |
| 386 | { |
| 387 | struct sock *sk; |
| 388 | |
| 389 | rcu_read_lock(); |
| 390 | if (req->sdiag_family == AF_INET) |
| 391 | sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], |
| 392 | req->id.idiag_dport, req->id.idiag_src[0], |
| 393 | req->id.idiag_sport, req->id.idiag_if); |
| 394 | #if IS_ENABLED(CONFIG_IPV6) |
| 395 | else if (req->sdiag_family == AF_INET6) { |
| 396 | if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && |
| 397 | ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) |
| 398 | sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], |
| 399 | req->id.idiag_dport, req->id.idiag_src[3], |
| 400 | req->id.idiag_sport, req->id.idiag_if); |
| 401 | else |
| 402 | sk = inet6_lookup(net, hashinfo, NULL, 0, |
| 403 | (struct in6_addr *)req->id.idiag_dst, |
| 404 | req->id.idiag_dport, |
| 405 | (struct in6_addr *)req->id.idiag_src, |
| 406 | req->id.idiag_sport, |
| 407 | req->id.idiag_if); |
| 408 | } |
| 409 | #endif |
| 410 | else { |
| 411 | rcu_read_unlock(); |
| 412 | return ERR_PTR(-EINVAL); |
| 413 | } |
| 414 | rcu_read_unlock(); |
| 415 | if (!sk) |
| 416 | return ERR_PTR(-ENOENT); |
| 417 | |
| 418 | if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { |
| 419 | sock_gen_put(sk); |
| 420 | return ERR_PTR(-ENOENT); |
| 421 | } |
| 422 | |
| 423 | return sk; |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); |
| 426 | |
| 427 | int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, |
| 428 | struct sk_buff *in_skb, |
| 429 | const struct nlmsghdr *nlh, |
| 430 | const struct inet_diag_req_v2 *req) |
| 431 | { |
| 432 | struct net *net = sock_net(in_skb->sk); |
| 433 | struct sk_buff *rep; |
| 434 | struct sock *sk; |
| 435 | int err; |
| 436 | |
| 437 | sk = inet_diag_find_one_icsk(net, hashinfo, req); |
| 438 | if (IS_ERR(sk)) |
| 439 | return PTR_ERR(sk); |
| 440 | |
| 441 | rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); |
| 442 | if (!rep) { |
| 443 | err = -ENOMEM; |
| 444 | goto out; |
| 445 | } |
| 446 | |
| 447 | err = sk_diag_fill(sk, rep, req, |
| 448 | sk_user_ns(NETLINK_CB(in_skb).sk), |
| 449 | NETLINK_CB(in_skb).portid, |
| 450 | nlh->nlmsg_seq, 0, nlh, |
| 451 | netlink_net_capable(in_skb, CAP_NET_ADMIN)); |
| 452 | if (err < 0) { |
| 453 | WARN_ON(err == -EMSGSIZE); |
| 454 | nlmsg_free(rep); |
| 455 | goto out; |
| 456 | } |
| 457 | err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, |
| 458 | MSG_DONTWAIT); |
| 459 | if (err > 0) |
| 460 | err = 0; |
| 461 | |
| 462 | out: |
| 463 | if (sk) |
| 464 | sock_gen_put(sk); |
| 465 | |
| 466 | return err; |
| 467 | } |
| 468 | EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); |
| 469 | |
| 470 | static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, |
| 471 | const struct nlmsghdr *nlh, |
| 472 | const struct inet_diag_req_v2 *req) |
| 473 | { |
| 474 | const struct inet_diag_handler *handler; |
| 475 | int err; |
| 476 | |
| 477 | handler = inet_diag_lock_handler(req->sdiag_protocol); |
| 478 | if (IS_ERR(handler)) |
| 479 | err = PTR_ERR(handler); |
| 480 | else if (cmd == SOCK_DIAG_BY_FAMILY) |
| 481 | err = handler->dump_one(in_skb, nlh, req); |
| 482 | else if (cmd == SOCK_DESTROY && handler->destroy) |
| 483 | err = handler->destroy(in_skb, req); |
| 484 | else |
| 485 | err = -EOPNOTSUPP; |
| 486 | inet_diag_unlock_handler(handler); |
| 487 | |
| 488 | return err; |
| 489 | } |
| 490 | |
| 491 | static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) |
| 492 | { |
| 493 | int words = bits >> 5; |
| 494 | |
| 495 | bits &= 0x1f; |
| 496 | |
| 497 | if (words) { |
| 498 | if (memcmp(a1, a2, words << 2)) |
| 499 | return 0; |
| 500 | } |
| 501 | if (bits) { |
| 502 | __be32 w1, w2; |
| 503 | __be32 mask; |
| 504 | |
| 505 | w1 = a1[words]; |
| 506 | w2 = a2[words]; |
| 507 | |
| 508 | mask = htonl((0xffffffff) << (32 - bits)); |
| 509 | |
| 510 | if ((w1 ^ w2) & mask) |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | return 1; |
| 515 | } |
| 516 | |
| 517 | static int inet_diag_bc_run(const struct nlattr *_bc, |
| 518 | const struct inet_diag_entry *entry) |
| 519 | { |
| 520 | const void *bc = nla_data(_bc); |
| 521 | int len = nla_len(_bc); |
| 522 | |
| 523 | while (len > 0) { |
| 524 | int yes = 1; |
| 525 | const struct inet_diag_bc_op *op = bc; |
| 526 | |
| 527 | switch (op->code) { |
| 528 | case INET_DIAG_BC_NOP: |
| 529 | break; |
| 530 | case INET_DIAG_BC_JMP: |
| 531 | yes = 0; |
| 532 | break; |
| 533 | case INET_DIAG_BC_S_GE: |
| 534 | yes = entry->sport >= op[1].no; |
| 535 | break; |
| 536 | case INET_DIAG_BC_S_LE: |
| 537 | yes = entry->sport <= op[1].no; |
| 538 | break; |
| 539 | case INET_DIAG_BC_D_GE: |
| 540 | yes = entry->dport >= op[1].no; |
| 541 | break; |
| 542 | case INET_DIAG_BC_D_LE: |
| 543 | yes = entry->dport <= op[1].no; |
| 544 | break; |
| 545 | case INET_DIAG_BC_AUTO: |
| 546 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
| 547 | break; |
| 548 | case INET_DIAG_BC_S_COND: |
| 549 | case INET_DIAG_BC_D_COND: { |
| 550 | const struct inet_diag_hostcond *cond; |
| 551 | const __be32 *addr; |
| 552 | |
| 553 | cond = (const struct inet_diag_hostcond *)(op + 1); |
| 554 | if (cond->port != -1 && |
| 555 | cond->port != (op->code == INET_DIAG_BC_S_COND ? |
| 556 | entry->sport : entry->dport)) { |
| 557 | yes = 0; |
| 558 | break; |
| 559 | } |
| 560 | |
| 561 | if (op->code == INET_DIAG_BC_S_COND) |
| 562 | addr = entry->saddr; |
| 563 | else |
| 564 | addr = entry->daddr; |
| 565 | |
| 566 | if (cond->family != AF_UNSPEC && |
| 567 | cond->family != entry->family) { |
| 568 | if (entry->family == AF_INET6 && |
| 569 | cond->family == AF_INET) { |
| 570 | if (addr[0] == 0 && addr[1] == 0 && |
| 571 | addr[2] == htonl(0xffff) && |
| 572 | bitstring_match(addr + 3, |
| 573 | cond->addr, |
| 574 | cond->prefix_len)) |
| 575 | break; |
| 576 | } |
| 577 | yes = 0; |
| 578 | break; |
| 579 | } |
| 580 | |
| 581 | if (cond->prefix_len == 0) |
| 582 | break; |
| 583 | if (bitstring_match(addr, cond->addr, |
| 584 | cond->prefix_len)) |
| 585 | break; |
| 586 | yes = 0; |
| 587 | break; |
| 588 | } |
| 589 | case INET_DIAG_BC_DEV_COND: { |
| 590 | u32 ifindex; |
| 591 | |
| 592 | ifindex = *((const u32 *)(op + 1)); |
| 593 | if (ifindex != entry->ifindex) |
| 594 | yes = 0; |
| 595 | break; |
| 596 | } |
| 597 | case INET_DIAG_BC_MARK_COND: { |
| 598 | struct inet_diag_markcond *cond; |
| 599 | |
| 600 | cond = (struct inet_diag_markcond *)(op + 1); |
| 601 | if ((entry->mark & cond->mask) != cond->mark) |
| 602 | yes = 0; |
| 603 | break; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | if (yes) { |
| 608 | len -= op->yes; |
| 609 | bc += op->yes; |
| 610 | } else { |
| 611 | len -= op->no; |
| 612 | bc += op->no; |
| 613 | } |
| 614 | } |
| 615 | return len == 0; |
| 616 | } |
| 617 | |
| 618 | /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) |
| 619 | */ |
| 620 | static void entry_fill_addrs(struct inet_diag_entry *entry, |
| 621 | const struct sock *sk) |
| 622 | { |
| 623 | #if IS_ENABLED(CONFIG_IPV6) |
| 624 | if (sk->sk_family == AF_INET6) { |
| 625 | entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; |
| 626 | entry->daddr = sk->sk_v6_daddr.s6_addr32; |
| 627 | } else |
| 628 | #endif |
| 629 | { |
| 630 | entry->saddr = &sk->sk_rcv_saddr; |
| 631 | entry->daddr = &sk->sk_daddr; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) |
| 636 | { |
| 637 | struct inet_sock *inet = inet_sk(sk); |
| 638 | struct inet_diag_entry entry; |
| 639 | |
| 640 | if (!bc) |
| 641 | return 1; |
| 642 | |
| 643 | entry.family = sk->sk_family; |
| 644 | entry_fill_addrs(&entry, sk); |
| 645 | entry.sport = inet->inet_num; |
| 646 | entry.dport = ntohs(inet->inet_dport); |
| 647 | entry.ifindex = sk->sk_bound_dev_if; |
| 648 | entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; |
| 649 | if (sk_fullsock(sk)) |
| 650 | entry.mark = sk->sk_mark; |
| 651 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
| 652 | entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; |
| 653 | else |
| 654 | entry.mark = 0; |
| 655 | |
| 656 | return inet_diag_bc_run(bc, &entry); |
| 657 | } |
| 658 | EXPORT_SYMBOL_GPL(inet_diag_bc_sk); |
| 659 | |
| 660 | static int valid_cc(const void *bc, int len, int cc) |
| 661 | { |
| 662 | while (len >= 0) { |
| 663 | const struct inet_diag_bc_op *op = bc; |
| 664 | |
| 665 | if (cc > len) |
| 666 | return 0; |
| 667 | if (cc == len) |
| 668 | return 1; |
| 669 | if (op->yes < 4 || op->yes & 3) |
| 670 | return 0; |
| 671 | len -= op->yes; |
| 672 | bc += op->yes; |
| 673 | } |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | /* data is u32 ifindex */ |
| 678 | static bool valid_devcond(const struct inet_diag_bc_op *op, int len, |
| 679 | int *min_len) |
| 680 | { |
| 681 | /* Check ifindex space. */ |
| 682 | *min_len += sizeof(u32); |
| 683 | if (len < *min_len) |
| 684 | return false; |
| 685 | |
| 686 | return true; |
| 687 | } |
| 688 | /* Validate an inet_diag_hostcond. */ |
| 689 | static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, |
| 690 | int *min_len) |
| 691 | { |
| 692 | struct inet_diag_hostcond *cond; |
| 693 | int addr_len; |
| 694 | |
| 695 | /* Check hostcond space. */ |
| 696 | *min_len += sizeof(struct inet_diag_hostcond); |
| 697 | if (len < *min_len) |
| 698 | return false; |
| 699 | cond = (struct inet_diag_hostcond *)(op + 1); |
| 700 | |
| 701 | /* Check address family and address length. */ |
| 702 | switch (cond->family) { |
| 703 | case AF_UNSPEC: |
| 704 | addr_len = 0; |
| 705 | break; |
| 706 | case AF_INET: |
| 707 | addr_len = sizeof(struct in_addr); |
| 708 | break; |
| 709 | case AF_INET6: |
| 710 | addr_len = sizeof(struct in6_addr); |
| 711 | break; |
| 712 | default: |
| 713 | return false; |
| 714 | } |
| 715 | *min_len += addr_len; |
| 716 | if (len < *min_len) |
| 717 | return false; |
| 718 | |
| 719 | /* Check prefix length (in bits) vs address length (in bytes). */ |
| 720 | if (cond->prefix_len > 8 * addr_len) |
| 721 | return false; |
| 722 | |
| 723 | return true; |
| 724 | } |
| 725 | |
| 726 | /* Validate a port comparison operator. */ |
| 727 | static bool valid_port_comparison(const struct inet_diag_bc_op *op, |
| 728 | int len, int *min_len) |
| 729 | { |
| 730 | /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ |
| 731 | *min_len += sizeof(struct inet_diag_bc_op); |
| 732 | if (len < *min_len) |
| 733 | return false; |
| 734 | return true; |
| 735 | } |
| 736 | |
| 737 | static bool valid_markcond(const struct inet_diag_bc_op *op, int len, |
| 738 | int *min_len) |
| 739 | { |
| 740 | *min_len += sizeof(struct inet_diag_markcond); |
| 741 | return len >= *min_len; |
| 742 | } |
| 743 | |
| 744 | static int inet_diag_bc_audit(const struct nlattr *attr, |
| 745 | const struct sk_buff *skb) |
| 746 | { |
| 747 | bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); |
| 748 | const void *bytecode, *bc; |
| 749 | int bytecode_len, len; |
| 750 | |
| 751 | if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) |
| 752 | return -EINVAL; |
| 753 | |
| 754 | bytecode = bc = nla_data(attr); |
| 755 | len = bytecode_len = nla_len(attr); |
| 756 | |
| 757 | while (len > 0) { |
| 758 | int min_len = sizeof(struct inet_diag_bc_op); |
| 759 | const struct inet_diag_bc_op *op = bc; |
| 760 | |
| 761 | switch (op->code) { |
| 762 | case INET_DIAG_BC_S_COND: |
| 763 | case INET_DIAG_BC_D_COND: |
| 764 | if (!valid_hostcond(bc, len, &min_len)) |
| 765 | return -EINVAL; |
| 766 | break; |
| 767 | case INET_DIAG_BC_DEV_COND: |
| 768 | if (!valid_devcond(bc, len, &min_len)) |
| 769 | return -EINVAL; |
| 770 | break; |
| 771 | case INET_DIAG_BC_S_GE: |
| 772 | case INET_DIAG_BC_S_LE: |
| 773 | case INET_DIAG_BC_D_GE: |
| 774 | case INET_DIAG_BC_D_LE: |
| 775 | if (!valid_port_comparison(bc, len, &min_len)) |
| 776 | return -EINVAL; |
| 777 | break; |
| 778 | case INET_DIAG_BC_MARK_COND: |
| 779 | if (!net_admin) |
| 780 | return -EPERM; |
| 781 | if (!valid_markcond(bc, len, &min_len)) |
| 782 | return -EINVAL; |
| 783 | break; |
| 784 | case INET_DIAG_BC_AUTO: |
| 785 | case INET_DIAG_BC_JMP: |
| 786 | case INET_DIAG_BC_NOP: |
| 787 | break; |
| 788 | default: |
| 789 | return -EINVAL; |
| 790 | } |
| 791 | |
| 792 | if (op->code != INET_DIAG_BC_NOP) { |
| 793 | if (op->no < min_len || op->no > len + 4 || op->no & 3) |
| 794 | return -EINVAL; |
| 795 | if (op->no < len && |
| 796 | !valid_cc(bytecode, bytecode_len, len - op->no)) |
| 797 | return -EINVAL; |
| 798 | } |
| 799 | |
| 800 | if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) |
| 801 | return -EINVAL; |
| 802 | bc += op->yes; |
| 803 | len -= op->yes; |
| 804 | } |
| 805 | return len == 0 ? 0 : -EINVAL; |
| 806 | } |
| 807 | |
| 808 | static int inet_csk_diag_dump(struct sock *sk, |
| 809 | struct sk_buff *skb, |
| 810 | struct netlink_callback *cb, |
| 811 | const struct inet_diag_req_v2 *r, |
| 812 | const struct nlattr *bc, |
| 813 | bool net_admin) |
| 814 | { |
| 815 | if (!inet_diag_bc_sk(bc, sk)) |
| 816 | return 0; |
| 817 | |
| 818 | return inet_csk_diag_fill(sk, skb, r, |
| 819 | sk_user_ns(NETLINK_CB(cb->skb).sk), |
| 820 | NETLINK_CB(cb->skb).portid, |
| 821 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, |
| 822 | net_admin); |
| 823 | } |
| 824 | |
| 825 | static void twsk_build_assert(void) |
| 826 | { |
| 827 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != |
| 828 | offsetof(struct sock, sk_family)); |
| 829 | |
| 830 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != |
| 831 | offsetof(struct inet_sock, inet_num)); |
| 832 | |
| 833 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != |
| 834 | offsetof(struct inet_sock, inet_dport)); |
| 835 | |
| 836 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != |
| 837 | offsetof(struct inet_sock, inet_rcv_saddr)); |
| 838 | |
| 839 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != |
| 840 | offsetof(struct inet_sock, inet_daddr)); |
| 841 | |
| 842 | #if IS_ENABLED(CONFIG_IPV6) |
| 843 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != |
| 844 | offsetof(struct sock, sk_v6_rcv_saddr)); |
| 845 | |
| 846 | BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != |
| 847 | offsetof(struct sock, sk_v6_daddr)); |
| 848 | #endif |
| 849 | } |
| 850 | |
| 851 | void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, |
| 852 | struct netlink_callback *cb, |
| 853 | const struct inet_diag_req_v2 *r, struct nlattr *bc) |
| 854 | { |
| 855 | struct net *net = sock_net(skb->sk); |
| 856 | int i, num, s_i, s_num; |
| 857 | u32 idiag_states = r->idiag_states; |
| 858 | bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); |
| 859 | |
| 860 | if (idiag_states & TCPF_SYN_RECV) |
| 861 | idiag_states |= TCPF_NEW_SYN_RECV; |
| 862 | s_i = cb->args[1]; |
| 863 | s_num = num = cb->args[2]; |
| 864 | |
| 865 | if (cb->args[0] == 0) { |
| 866 | if (!(idiag_states & TCPF_LISTEN)) |
| 867 | goto skip_listen_ht; |
| 868 | |
| 869 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
| 870 | struct inet_listen_hashbucket *ilb; |
| 871 | struct sock *sk; |
| 872 | |
| 873 | num = 0; |
| 874 | ilb = &hashinfo->listening_hash[i]; |
| 875 | spin_lock_bh(&ilb->lock); |
| 876 | sk_for_each(sk, &ilb->head) { |
| 877 | struct inet_sock *inet = inet_sk(sk); |
| 878 | |
| 879 | if (!net_eq(sock_net(sk), net)) |
| 880 | continue; |
| 881 | |
| 882 | if (num < s_num) { |
| 883 | num++; |
| 884 | continue; |
| 885 | } |
| 886 | |
| 887 | if (r->sdiag_family != AF_UNSPEC && |
| 888 | sk->sk_family != r->sdiag_family) |
| 889 | goto next_listen; |
| 890 | |
| 891 | if (r->id.idiag_sport != inet->inet_sport && |
| 892 | r->id.idiag_sport) |
| 893 | goto next_listen; |
| 894 | |
| 895 | if (r->id.idiag_dport || |
| 896 | cb->args[3] > 0) |
| 897 | goto next_listen; |
| 898 | |
| 899 | if (inet_csk_diag_dump(sk, skb, cb, r, |
| 900 | bc, net_admin) < 0) { |
| 901 | spin_unlock_bh(&ilb->lock); |
| 902 | goto done; |
| 903 | } |
| 904 | |
| 905 | next_listen: |
| 906 | cb->args[3] = 0; |
| 907 | cb->args[4] = 0; |
| 908 | ++num; |
| 909 | } |
| 910 | spin_unlock_bh(&ilb->lock); |
| 911 | |
| 912 | s_num = 0; |
| 913 | cb->args[3] = 0; |
| 914 | cb->args[4] = 0; |
| 915 | } |
| 916 | skip_listen_ht: |
| 917 | cb->args[0] = 1; |
| 918 | s_i = num = s_num = 0; |
| 919 | } |
| 920 | |
| 921 | if (!(idiag_states & ~TCPF_LISTEN)) |
| 922 | goto out; |
| 923 | |
| 924 | for (i = s_i; i <= hashinfo->ehash_mask; i++) { |
| 925 | struct inet_ehash_bucket *head = &hashinfo->ehash[i]; |
| 926 | spinlock_t *lock = inet_ehash_lockp(hashinfo, i); |
| 927 | struct hlist_nulls_node *node; |
| 928 | struct sock *sk; |
| 929 | |
| 930 | num = 0; |
| 931 | |
| 932 | if (hlist_nulls_empty(&head->chain)) |
| 933 | continue; |
| 934 | |
| 935 | if (i > s_i) |
| 936 | s_num = 0; |
| 937 | |
| 938 | spin_lock_bh(lock); |
| 939 | sk_nulls_for_each(sk, node, &head->chain) { |
| 940 | int state, res; |
| 941 | |
| 942 | if (!net_eq(sock_net(sk), net)) |
| 943 | continue; |
| 944 | if (num < s_num) |
| 945 | goto next_normal; |
| 946 | state = (sk->sk_state == TCP_TIME_WAIT) ? |
| 947 | inet_twsk(sk)->tw_substate : sk->sk_state; |
| 948 | if (!(idiag_states & (1 << state))) |
| 949 | goto next_normal; |
| 950 | if (r->sdiag_family != AF_UNSPEC && |
| 951 | sk->sk_family != r->sdiag_family) |
| 952 | goto next_normal; |
| 953 | if (r->id.idiag_sport != htons(sk->sk_num) && |
| 954 | r->id.idiag_sport) |
| 955 | goto next_normal; |
| 956 | if (r->id.idiag_dport != sk->sk_dport && |
| 957 | r->id.idiag_dport) |
| 958 | goto next_normal; |
| 959 | twsk_build_assert(); |
| 960 | |
| 961 | if (!inet_diag_bc_sk(bc, sk)) |
| 962 | goto next_normal; |
| 963 | |
| 964 | res = sk_diag_fill(sk, skb, r, |
| 965 | sk_user_ns(NETLINK_CB(cb->skb).sk), |
| 966 | NETLINK_CB(cb->skb).portid, |
| 967 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 968 | cb->nlh, net_admin); |
| 969 | if (res < 0) { |
| 970 | spin_unlock_bh(lock); |
| 971 | goto done; |
| 972 | } |
| 973 | next_normal: |
| 974 | ++num; |
| 975 | } |
| 976 | |
| 977 | spin_unlock_bh(lock); |
| 978 | cond_resched(); |
| 979 | } |
| 980 | |
| 981 | done: |
| 982 | cb->args[1] = i; |
| 983 | cb->args[2] = num; |
| 984 | out: |
| 985 | ; |
| 986 | } |
| 987 | EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); |
| 988 | |
| 989 | static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| 990 | const struct inet_diag_req_v2 *r, |
| 991 | struct nlattr *bc) |
| 992 | { |
| 993 | const struct inet_diag_handler *handler; |
| 994 | int err = 0; |
| 995 | |
| 996 | handler = inet_diag_lock_handler(r->sdiag_protocol); |
| 997 | if (!IS_ERR(handler)) |
| 998 | handler->dump(skb, cb, r, bc); |
| 999 | else |
| 1000 | err = PTR_ERR(handler); |
| 1001 | inet_diag_unlock_handler(handler); |
| 1002 | |
| 1003 | return err ? : skb->len; |
| 1004 | } |
| 1005 | |
| 1006 | static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1007 | { |
| 1008 | int hdrlen = sizeof(struct inet_diag_req_v2); |
| 1009 | struct nlattr *bc = NULL; |
| 1010 | |
| 1011 | if (nlmsg_attrlen(cb->nlh, hdrlen)) |
| 1012 | bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); |
| 1013 | |
| 1014 | return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); |
| 1015 | } |
| 1016 | |
| 1017 | static int inet_diag_type2proto(int type) |
| 1018 | { |
| 1019 | switch (type) { |
| 1020 | case TCPDIAG_GETSOCK: |
| 1021 | return IPPROTO_TCP; |
| 1022 | case DCCPDIAG_GETSOCK: |
| 1023 | return IPPROTO_DCCP; |
| 1024 | default: |
| 1025 | return 0; |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | static int inet_diag_dump_compat(struct sk_buff *skb, |
| 1030 | struct netlink_callback *cb) |
| 1031 | { |
| 1032 | struct inet_diag_req *rc = nlmsg_data(cb->nlh); |
| 1033 | int hdrlen = sizeof(struct inet_diag_req); |
| 1034 | struct inet_diag_req_v2 req; |
| 1035 | struct nlattr *bc = NULL; |
| 1036 | |
| 1037 | req.sdiag_family = AF_UNSPEC; /* compatibility */ |
| 1038 | req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); |
| 1039 | req.idiag_ext = rc->idiag_ext; |
| 1040 | req.idiag_states = rc->idiag_states; |
| 1041 | req.id = rc->id; |
| 1042 | |
| 1043 | if (nlmsg_attrlen(cb->nlh, hdrlen)) |
| 1044 | bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); |
| 1045 | |
| 1046 | return __inet_diag_dump(skb, cb, &req, bc); |
| 1047 | } |
| 1048 | |
| 1049 | static int inet_diag_get_exact_compat(struct sk_buff *in_skb, |
| 1050 | const struct nlmsghdr *nlh) |
| 1051 | { |
| 1052 | struct inet_diag_req *rc = nlmsg_data(nlh); |
| 1053 | struct inet_diag_req_v2 req; |
| 1054 | |
| 1055 | req.sdiag_family = rc->idiag_family; |
| 1056 | req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); |
| 1057 | req.idiag_ext = rc->idiag_ext; |
| 1058 | req.idiag_states = rc->idiag_states; |
| 1059 | req.id = rc->id; |
| 1060 | |
| 1061 | return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); |
| 1062 | } |
| 1063 | |
| 1064 | static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 1065 | { |
| 1066 | int hdrlen = sizeof(struct inet_diag_req); |
| 1067 | struct net *net = sock_net(skb->sk); |
| 1068 | |
| 1069 | if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
| 1070 | nlmsg_len(nlh) < hdrlen) |
| 1071 | return -EINVAL; |
| 1072 | |
| 1073 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1074 | if (nlmsg_attrlen(nlh, hdrlen)) { |
| 1075 | struct nlattr *attr; |
| 1076 | int err; |
| 1077 | |
| 1078 | attr = nlmsg_find_attr(nlh, hdrlen, |
| 1079 | INET_DIAG_REQ_BYTECODE); |
| 1080 | err = inet_diag_bc_audit(attr, skb); |
| 1081 | if (err) |
| 1082 | return err; |
| 1083 | } |
| 1084 | { |
| 1085 | struct netlink_dump_control c = { |
| 1086 | .dump = inet_diag_dump_compat, |
| 1087 | }; |
| 1088 | return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | return inet_diag_get_exact_compat(skb, nlh); |
| 1093 | } |
| 1094 | |
| 1095 | static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) |
| 1096 | { |
| 1097 | int hdrlen = sizeof(struct inet_diag_req_v2); |
| 1098 | struct net *net = sock_net(skb->sk); |
| 1099 | |
| 1100 | if (nlmsg_len(h) < hdrlen) |
| 1101 | return -EINVAL; |
| 1102 | |
| 1103 | if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && |
| 1104 | h->nlmsg_flags & NLM_F_DUMP) { |
| 1105 | if (nlmsg_attrlen(h, hdrlen)) { |
| 1106 | struct nlattr *attr; |
| 1107 | int err; |
| 1108 | |
| 1109 | attr = nlmsg_find_attr(h, hdrlen, |
| 1110 | INET_DIAG_REQ_BYTECODE); |
| 1111 | err = inet_diag_bc_audit(attr, skb); |
| 1112 | if (err) |
| 1113 | return err; |
| 1114 | } |
| 1115 | { |
| 1116 | struct netlink_dump_control c = { |
| 1117 | .dump = inet_diag_dump, |
| 1118 | }; |
| 1119 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); |
| 1120 | } |
| 1121 | } |
| 1122 | |
| 1123 | return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); |
| 1124 | } |
| 1125 | |
| 1126 | static |
| 1127 | int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) |
| 1128 | { |
| 1129 | const struct inet_diag_handler *handler; |
| 1130 | struct nlmsghdr *nlh; |
| 1131 | struct nlattr *attr; |
| 1132 | struct inet_diag_msg *r; |
| 1133 | void *info = NULL; |
| 1134 | int err = 0; |
| 1135 | |
| 1136 | nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); |
| 1137 | if (!nlh) |
| 1138 | return -ENOMEM; |
| 1139 | |
| 1140 | r = nlmsg_data(nlh); |
| 1141 | memset(r, 0, sizeof(*r)); |
| 1142 | inet_diag_msg_common_fill(r, sk); |
| 1143 | if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) |
| 1144 | r->id.idiag_sport = inet_sk(sk)->inet_sport; |
| 1145 | r->idiag_state = sk->sk_state; |
| 1146 | |
| 1147 | if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { |
| 1148 | nlmsg_cancel(skb, nlh); |
| 1149 | return err; |
| 1150 | } |
| 1151 | |
| 1152 | handler = inet_diag_lock_handler(sk->sk_protocol); |
| 1153 | if (IS_ERR(handler)) { |
| 1154 | inet_diag_unlock_handler(handler); |
| 1155 | nlmsg_cancel(skb, nlh); |
| 1156 | return PTR_ERR(handler); |
| 1157 | } |
| 1158 | |
| 1159 | attr = handler->idiag_info_size |
| 1160 | ? nla_reserve_64bit(skb, INET_DIAG_INFO, |
| 1161 | handler->idiag_info_size, |
| 1162 | INET_DIAG_PAD) |
| 1163 | : NULL; |
| 1164 | if (attr) |
| 1165 | info = nla_data(attr); |
| 1166 | |
| 1167 | handler->idiag_get_info(sk, r, info); |
| 1168 | inet_diag_unlock_handler(handler); |
| 1169 | |
| 1170 | nlmsg_end(skb, nlh); |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | static const struct sock_diag_handler inet_diag_handler = { |
| 1175 | .family = AF_INET, |
| 1176 | .dump = inet_diag_handler_cmd, |
| 1177 | .get_info = inet_diag_handler_get_info, |
| 1178 | .destroy = inet_diag_handler_cmd, |
| 1179 | }; |
| 1180 | |
| 1181 | static const struct sock_diag_handler inet6_diag_handler = { |
| 1182 | .family = AF_INET6, |
| 1183 | .dump = inet_diag_handler_cmd, |
| 1184 | .get_info = inet_diag_handler_get_info, |
| 1185 | .destroy = inet_diag_handler_cmd, |
| 1186 | }; |
| 1187 | |
| 1188 | int inet_diag_register(const struct inet_diag_handler *h) |
| 1189 | { |
| 1190 | const __u16 type = h->idiag_type; |
| 1191 | int err = -EINVAL; |
| 1192 | |
| 1193 | if (type >= IPPROTO_MAX) |
| 1194 | goto out; |
| 1195 | |
| 1196 | mutex_lock(&inet_diag_table_mutex); |
| 1197 | err = -EEXIST; |
| 1198 | if (!inet_diag_table[type]) { |
| 1199 | inet_diag_table[type] = h; |
| 1200 | err = 0; |
| 1201 | } |
| 1202 | mutex_unlock(&inet_diag_table_mutex); |
| 1203 | out: |
| 1204 | return err; |
| 1205 | } |
| 1206 | EXPORT_SYMBOL_GPL(inet_diag_register); |
| 1207 | |
| 1208 | void inet_diag_unregister(const struct inet_diag_handler *h) |
| 1209 | { |
| 1210 | const __u16 type = h->idiag_type; |
| 1211 | |
| 1212 | if (type >= IPPROTO_MAX) |
| 1213 | return; |
| 1214 | |
| 1215 | mutex_lock(&inet_diag_table_mutex); |
| 1216 | inet_diag_table[type] = NULL; |
| 1217 | mutex_unlock(&inet_diag_table_mutex); |
| 1218 | } |
| 1219 | EXPORT_SYMBOL_GPL(inet_diag_unregister); |
| 1220 | |
| 1221 | static int __init inet_diag_init(void) |
| 1222 | { |
| 1223 | const int inet_diag_table_size = (IPPROTO_MAX * |
| 1224 | sizeof(struct inet_diag_handler *)); |
| 1225 | int err = -ENOMEM; |
| 1226 | |
| 1227 | inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
| 1228 | if (!inet_diag_table) |
| 1229 | goto out; |
| 1230 | |
| 1231 | err = sock_diag_register(&inet_diag_handler); |
| 1232 | if (err) |
| 1233 | goto out_free_nl; |
| 1234 | |
| 1235 | err = sock_diag_register(&inet6_diag_handler); |
| 1236 | if (err) |
| 1237 | goto out_free_inet; |
| 1238 | |
| 1239 | sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); |
| 1240 | out: |
| 1241 | return err; |
| 1242 | |
| 1243 | out_free_inet: |
| 1244 | sock_diag_unregister(&inet_diag_handler); |
| 1245 | out_free_nl: |
| 1246 | kfree(inet_diag_table); |
| 1247 | goto out; |
| 1248 | } |
| 1249 | |
| 1250 | static void __exit inet_diag_exit(void) |
| 1251 | { |
| 1252 | sock_diag_unregister(&inet6_diag_handler); |
| 1253 | sock_diag_unregister(&inet_diag_handler); |
| 1254 | sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); |
| 1255 | kfree(inet_diag_table); |
| 1256 | } |
| 1257 | |
| 1258 | module_init(inet_diag_init); |
| 1259 | module_exit(inet_diag_exit); |
| 1260 | MODULE_LICENSE("GPL"); |
| 1261 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); |
| 1262 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); |