Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * tcp_diag.c Module for monitoring TCP sockets. |
| 3 | * |
| 4 | * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ |
| 5 | * |
| 6 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/config.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/fcntl.h> |
| 18 | #include <linux/random.h> |
| 19 | #include <linux/cache.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/time.h> |
| 22 | |
| 23 | #include <net/icmp.h> |
| 24 | #include <net/tcp.h> |
| 25 | #include <net/ipv6.h> |
| 26 | #include <net/inet_common.h> |
| 27 | |
| 28 | #include <linux/inet.h> |
| 29 | #include <linux/stddef.h> |
| 30 | |
| 31 | #include <linux/tcp_diag.h> |
| 32 | |
| 33 | struct tcpdiag_entry |
| 34 | { |
| 35 | u32 *saddr; |
| 36 | u32 *daddr; |
| 37 | u16 sport; |
| 38 | u16 dport; |
| 39 | u16 family; |
| 40 | u16 userlocks; |
| 41 | }; |
| 42 | |
| 43 | static struct sock *tcpnl; |
| 44 | |
| 45 | |
| 46 | #define TCPDIAG_PUT(skb, attrtype, attrlen) \ |
| 47 | ({ int rtalen = RTA_LENGTH(attrlen); \ |
| 48 | struct rtattr *rta; \ |
| 49 | if (skb_tailroom(skb) < RTA_ALIGN(rtalen)) goto nlmsg_failure; \ |
| 50 | rta = (void*)__skb_put(skb, RTA_ALIGN(rtalen)); \ |
| 51 | rta->rta_type = attrtype; \ |
| 52 | rta->rta_len = rtalen; \ |
| 53 | RTA_DATA(rta); }) |
| 54 | |
| 55 | static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, |
| 56 | int ext, u32 pid, u32 seq, u16 nlmsg_flags) |
| 57 | { |
| 58 | struct inet_sock *inet = inet_sk(sk); |
| 59 | struct tcp_sock *tp = tcp_sk(sk); |
| 60 | struct tcpdiagmsg *r; |
| 61 | struct nlmsghdr *nlh; |
| 62 | struct tcp_info *info = NULL; |
| 63 | struct tcpdiag_meminfo *minfo = NULL; |
| 64 | struct tcpvegas_info *vinfo = NULL; |
| 65 | unsigned char *b = skb->tail; |
| 66 | |
| 67 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); |
| 68 | nlh->nlmsg_flags = nlmsg_flags; |
| 69 | r = NLMSG_DATA(nlh); |
| 70 | if (sk->sk_state != TCP_TIME_WAIT) { |
| 71 | if (ext & (1<<(TCPDIAG_MEMINFO-1))) |
| 72 | minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); |
| 73 | if (ext & (1<<(TCPDIAG_INFO-1))) |
| 74 | info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info)); |
| 75 | |
| 76 | if ((tcp_is_westwood(tp) || tcp_is_vegas(tp)) |
| 77 | && (ext & (1<<(TCPDIAG_VEGASINFO-1)))) |
| 78 | vinfo = TCPDIAG_PUT(skb, TCPDIAG_VEGASINFO, sizeof(*vinfo)); |
| 79 | } |
| 80 | r->tcpdiag_family = sk->sk_family; |
| 81 | r->tcpdiag_state = sk->sk_state; |
| 82 | r->tcpdiag_timer = 0; |
| 83 | r->tcpdiag_retrans = 0; |
| 84 | |
| 85 | r->id.tcpdiag_if = sk->sk_bound_dev_if; |
| 86 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; |
| 87 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); |
| 88 | |
| 89 | if (r->tcpdiag_state == TCP_TIME_WAIT) { |
| 90 | struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk; |
| 91 | long tmo = tw->tw_ttd - jiffies; |
| 92 | if (tmo < 0) |
| 93 | tmo = 0; |
| 94 | |
| 95 | r->id.tcpdiag_sport = tw->tw_sport; |
| 96 | r->id.tcpdiag_dport = tw->tw_dport; |
| 97 | r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; |
| 98 | r->id.tcpdiag_dst[0] = tw->tw_daddr; |
| 99 | r->tcpdiag_state = tw->tw_substate; |
| 100 | r->tcpdiag_timer = 3; |
| 101 | r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; |
| 102 | r->tcpdiag_rqueue = 0; |
| 103 | r->tcpdiag_wqueue = 0; |
| 104 | r->tcpdiag_uid = 0; |
| 105 | r->tcpdiag_inode = 0; |
| 106 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 107 | if (r->tcpdiag_family == AF_INET6) { |
| 108 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, |
| 109 | &tw->tw_v6_rcv_saddr); |
| 110 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
| 111 | &tw->tw_v6_daddr); |
| 112 | } |
| 113 | #endif |
| 114 | nlh->nlmsg_len = skb->tail - b; |
| 115 | return skb->len; |
| 116 | } |
| 117 | |
| 118 | r->id.tcpdiag_sport = inet->sport; |
| 119 | r->id.tcpdiag_dport = inet->dport; |
| 120 | r->id.tcpdiag_src[0] = inet->rcv_saddr; |
| 121 | r->id.tcpdiag_dst[0] = inet->daddr; |
| 122 | |
| 123 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 124 | if (r->tcpdiag_family == AF_INET6) { |
| 125 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 126 | |
| 127 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, |
| 128 | &np->rcv_saddr); |
| 129 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
| 130 | &np->daddr); |
| 131 | } |
| 132 | #endif |
| 133 | |
| 134 | #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ |
| 135 | |
| 136 | if (tp->pending == TCP_TIME_RETRANS) { |
| 137 | r->tcpdiag_timer = 1; |
| 138 | r->tcpdiag_retrans = tp->retransmits; |
| 139 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); |
| 140 | } else if (tp->pending == TCP_TIME_PROBE0) { |
| 141 | r->tcpdiag_timer = 4; |
| 142 | r->tcpdiag_retrans = tp->probes_out; |
| 143 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); |
| 144 | } else if (timer_pending(&sk->sk_timer)) { |
| 145 | r->tcpdiag_timer = 2; |
| 146 | r->tcpdiag_retrans = tp->probes_out; |
| 147 | r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); |
| 148 | } else { |
| 149 | r->tcpdiag_timer = 0; |
| 150 | r->tcpdiag_expires = 0; |
| 151 | } |
| 152 | #undef EXPIRES_IN_MS |
| 153 | |
| 154 | r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; |
| 155 | r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; |
| 156 | r->tcpdiag_uid = sock_i_uid(sk); |
| 157 | r->tcpdiag_inode = sock_i_ino(sk); |
| 158 | |
| 159 | if (minfo) { |
| 160 | minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); |
| 161 | minfo->tcpdiag_wmem = sk->sk_wmem_queued; |
| 162 | minfo->tcpdiag_fmem = sk->sk_forward_alloc; |
| 163 | minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); |
| 164 | } |
| 165 | |
| 166 | if (info) |
| 167 | tcp_get_info(sk, info); |
| 168 | |
| 169 | if (vinfo) { |
| 170 | if (tcp_is_vegas(tp)) { |
| 171 | vinfo->tcpv_enabled = tp->vegas.doing_vegas_now; |
| 172 | vinfo->tcpv_rttcnt = tp->vegas.cntRTT; |
| 173 | vinfo->tcpv_rtt = jiffies_to_usecs(tp->vegas.baseRTT); |
| 174 | vinfo->tcpv_minrtt = jiffies_to_usecs(tp->vegas.minRTT); |
| 175 | } else { |
| 176 | vinfo->tcpv_enabled = 0; |
| 177 | vinfo->tcpv_rttcnt = 0; |
| 178 | vinfo->tcpv_rtt = jiffies_to_usecs(tp->westwood.rtt); |
| 179 | vinfo->tcpv_minrtt = jiffies_to_usecs(tp->westwood.rtt_min); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | nlh->nlmsg_len = skb->tail - b; |
| 184 | return skb->len; |
| 185 | |
| 186 | nlmsg_failure: |
| 187 | skb_trim(skb, b - skb->data); |
| 188 | return -1; |
| 189 | } |
| 190 | |
| 191 | extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, |
| 192 | int dif); |
| 193 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 194 | extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, |
| 195 | struct in6_addr *daddr, u16 dport, |
| 196 | int dif); |
| 197 | #else |
| 198 | static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, |
| 199 | struct in6_addr *daddr, u16 dport, |
| 200 | int dif) |
| 201 | { |
| 202 | return NULL; |
| 203 | } |
| 204 | #endif |
| 205 | |
| 206 | static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) |
| 207 | { |
| 208 | int err; |
| 209 | struct sock *sk; |
| 210 | struct tcpdiagreq *req = NLMSG_DATA(nlh); |
| 211 | struct sk_buff *rep; |
| 212 | |
| 213 | if (req->tcpdiag_family == AF_INET) { |
| 214 | sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport, |
| 215 | req->id.tcpdiag_src[0], req->id.tcpdiag_sport, |
| 216 | req->id.tcpdiag_if); |
| 217 | } |
| 218 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 219 | else if (req->tcpdiag_family == AF_INET6) { |
| 220 | sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport, |
| 221 | (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport, |
| 222 | req->id.tcpdiag_if); |
| 223 | } |
| 224 | #endif |
| 225 | else { |
| 226 | return -EINVAL; |
| 227 | } |
| 228 | |
| 229 | if (sk == NULL) |
| 230 | return -ENOENT; |
| 231 | |
| 232 | err = -ESTALE; |
| 233 | if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || |
| 234 | req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && |
| 235 | ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || |
| 236 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) |
| 237 | goto out; |
| 238 | |
| 239 | err = -ENOMEM; |
| 240 | rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+ |
| 241 | sizeof(struct tcpdiag_meminfo)+ |
| 242 | sizeof(struct tcp_info)+64), GFP_KERNEL); |
| 243 | if (!rep) |
| 244 | goto out; |
| 245 | |
| 246 | if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, |
| 247 | NETLINK_CB(in_skb).pid, |
| 248 | nlh->nlmsg_seq, 0) <= 0) |
| 249 | BUG(); |
| 250 | |
| 251 | err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); |
| 252 | if (err > 0) |
| 253 | err = 0; |
| 254 | |
| 255 | out: |
| 256 | if (sk) { |
| 257 | if (sk->sk_state == TCP_TIME_WAIT) |
| 258 | tcp_tw_put((struct tcp_tw_bucket*)sk); |
| 259 | else |
| 260 | sock_put(sk); |
| 261 | } |
| 262 | return err; |
| 263 | } |
| 264 | |
| 265 | static int bitstring_match(const u32 *a1, const u32 *a2, int bits) |
| 266 | { |
| 267 | int words = bits >> 5; |
| 268 | |
| 269 | bits &= 0x1f; |
| 270 | |
| 271 | if (words) { |
| 272 | if (memcmp(a1, a2, words << 2)) |
| 273 | return 0; |
| 274 | } |
| 275 | if (bits) { |
| 276 | __u32 w1, w2; |
| 277 | __u32 mask; |
| 278 | |
| 279 | w1 = a1[words]; |
| 280 | w2 = a2[words]; |
| 281 | |
| 282 | mask = htonl((0xffffffff) << (32 - bits)); |
| 283 | |
| 284 | if ((w1 ^ w2) & mask) |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | return 1; |
| 289 | } |
| 290 | |
| 291 | |
| 292 | static int tcpdiag_bc_run(const void *bc, int len, |
| 293 | const struct tcpdiag_entry *entry) |
| 294 | { |
| 295 | while (len > 0) { |
| 296 | int yes = 1; |
| 297 | const struct tcpdiag_bc_op *op = bc; |
| 298 | |
| 299 | switch (op->code) { |
| 300 | case TCPDIAG_BC_NOP: |
| 301 | break; |
| 302 | case TCPDIAG_BC_JMP: |
| 303 | yes = 0; |
| 304 | break; |
| 305 | case TCPDIAG_BC_S_GE: |
| 306 | yes = entry->sport >= op[1].no; |
| 307 | break; |
| 308 | case TCPDIAG_BC_S_LE: |
| 309 | yes = entry->dport <= op[1].no; |
| 310 | break; |
| 311 | case TCPDIAG_BC_D_GE: |
| 312 | yes = entry->dport >= op[1].no; |
| 313 | break; |
| 314 | case TCPDIAG_BC_D_LE: |
| 315 | yes = entry->dport <= op[1].no; |
| 316 | break; |
| 317 | case TCPDIAG_BC_AUTO: |
| 318 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
| 319 | break; |
| 320 | case TCPDIAG_BC_S_COND: |
| 321 | case TCPDIAG_BC_D_COND: |
| 322 | { |
| 323 | struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); |
| 324 | u32 *addr; |
| 325 | |
| 326 | if (cond->port != -1 && |
| 327 | cond->port != (op->code == TCPDIAG_BC_S_COND ? |
| 328 | entry->sport : entry->dport)) { |
| 329 | yes = 0; |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | if (cond->prefix_len == 0) |
| 334 | break; |
| 335 | |
| 336 | if (op->code == TCPDIAG_BC_S_COND) |
| 337 | addr = entry->saddr; |
| 338 | else |
| 339 | addr = entry->daddr; |
| 340 | |
| 341 | if (bitstring_match(addr, cond->addr, cond->prefix_len)) |
| 342 | break; |
| 343 | if (entry->family == AF_INET6 && |
| 344 | cond->family == AF_INET) { |
| 345 | if (addr[0] == 0 && addr[1] == 0 && |
| 346 | addr[2] == htonl(0xffff) && |
| 347 | bitstring_match(addr+3, cond->addr, cond->prefix_len)) |
| 348 | break; |
| 349 | } |
| 350 | yes = 0; |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | if (yes) { |
| 356 | len -= op->yes; |
| 357 | bc += op->yes; |
| 358 | } else { |
| 359 | len -= op->no; |
| 360 | bc += op->no; |
| 361 | } |
| 362 | } |
| 363 | return (len == 0); |
| 364 | } |
| 365 | |
| 366 | static int valid_cc(const void *bc, int len, int cc) |
| 367 | { |
| 368 | while (len >= 0) { |
| 369 | const struct tcpdiag_bc_op *op = bc; |
| 370 | |
| 371 | if (cc > len) |
| 372 | return 0; |
| 373 | if (cc == len) |
| 374 | return 1; |
| 375 | if (op->yes < 4) |
| 376 | return 0; |
| 377 | len -= op->yes; |
| 378 | bc += op->yes; |
| 379 | } |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) |
| 384 | { |
| 385 | const unsigned char *bc = bytecode; |
| 386 | int len = bytecode_len; |
| 387 | |
| 388 | while (len > 0) { |
| 389 | struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; |
| 390 | |
| 391 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); |
| 392 | switch (op->code) { |
| 393 | case TCPDIAG_BC_AUTO: |
| 394 | case TCPDIAG_BC_S_COND: |
| 395 | case TCPDIAG_BC_D_COND: |
| 396 | case TCPDIAG_BC_S_GE: |
| 397 | case TCPDIAG_BC_S_LE: |
| 398 | case TCPDIAG_BC_D_GE: |
| 399 | case TCPDIAG_BC_D_LE: |
| 400 | if (op->yes < 4 || op->yes > len+4) |
| 401 | return -EINVAL; |
| 402 | case TCPDIAG_BC_JMP: |
| 403 | if (op->no < 4 || op->no > len+4) |
| 404 | return -EINVAL; |
| 405 | if (op->no < len && |
| 406 | !valid_cc(bytecode, bytecode_len, len-op->no)) |
| 407 | return -EINVAL; |
| 408 | break; |
| 409 | case TCPDIAG_BC_NOP: |
| 410 | if (op->yes < 4 || op->yes > len+4) |
| 411 | return -EINVAL; |
| 412 | break; |
| 413 | default: |
| 414 | return -EINVAL; |
| 415 | } |
| 416 | bc += op->yes; |
| 417 | len -= op->yes; |
| 418 | } |
| 419 | return len == 0 ? 0 : -EINVAL; |
| 420 | } |
| 421 | |
| 422 | static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, |
| 423 | struct netlink_callback *cb) |
| 424 | { |
| 425 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); |
| 426 | |
| 427 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
| 428 | struct tcpdiag_entry entry; |
| 429 | struct rtattr *bc = (struct rtattr *)(r + 1); |
| 430 | struct inet_sock *inet = inet_sk(sk); |
| 431 | |
| 432 | entry.family = sk->sk_family; |
| 433 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 434 | if (entry.family == AF_INET6) { |
| 435 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 436 | |
| 437 | entry.saddr = np->rcv_saddr.s6_addr32; |
| 438 | entry.daddr = np->daddr.s6_addr32; |
| 439 | } else |
| 440 | #endif |
| 441 | { |
| 442 | entry.saddr = &inet->rcv_saddr; |
| 443 | entry.daddr = &inet->daddr; |
| 444 | } |
| 445 | entry.sport = inet->num; |
| 446 | entry.dport = ntohs(inet->dport); |
| 447 | entry.userlocks = sk->sk_userlocks; |
| 448 | |
| 449 | if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, |
| 454 | cb->nlh->nlmsg_seq, NLM_F_MULTI); |
| 455 | } |
| 456 | |
| 457 | static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, |
| 458 | struct open_request *req, |
| 459 | u32 pid, u32 seq) |
| 460 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 461 | const struct inet_request_sock *ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | struct inet_sock *inet = inet_sk(sk); |
| 463 | unsigned char *b = skb->tail; |
| 464 | struct tcpdiagmsg *r; |
| 465 | struct nlmsghdr *nlh; |
| 466 | long tmo; |
| 467 | |
| 468 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); |
| 469 | nlh->nlmsg_flags = NLM_F_MULTI; |
| 470 | r = NLMSG_DATA(nlh); |
| 471 | |
| 472 | r->tcpdiag_family = sk->sk_family; |
| 473 | r->tcpdiag_state = TCP_SYN_RECV; |
| 474 | r->tcpdiag_timer = 1; |
| 475 | r->tcpdiag_retrans = req->retrans; |
| 476 | |
| 477 | r->id.tcpdiag_if = sk->sk_bound_dev_if; |
| 478 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; |
| 479 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); |
| 480 | |
| 481 | tmo = req->expires - jiffies; |
| 482 | if (tmo < 0) |
| 483 | tmo = 0; |
| 484 | |
| 485 | r->id.tcpdiag_sport = inet->sport; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 486 | r->id.tcpdiag_dport = ireq->rmt_port; |
| 487 | r->id.tcpdiag_src[0] = ireq->loc_addr; |
| 488 | r->id.tcpdiag_dst[0] = ireq->rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | r->tcpdiag_expires = jiffies_to_msecs(tmo), |
| 490 | r->tcpdiag_rqueue = 0; |
| 491 | r->tcpdiag_wqueue = 0; |
| 492 | r->tcpdiag_uid = sock_i_uid(sk); |
| 493 | r->tcpdiag_inode = 0; |
| 494 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 495 | if (r->tcpdiag_family == AF_INET6) { |
| 496 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 497 | &tcp6_rsk(req)->loc_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 499 | &tcp6_rsk(req)->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | #endif |
| 502 | nlh->nlmsg_len = skb->tail - b; |
| 503 | |
| 504 | return skb->len; |
| 505 | |
| 506 | nlmsg_failure: |
| 507 | skb_trim(skb, b - skb->data); |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, |
| 512 | struct netlink_callback *cb) |
| 513 | { |
| 514 | struct tcpdiag_entry entry; |
| 515 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); |
| 516 | struct tcp_sock *tp = tcp_sk(sk); |
| 517 | struct tcp_listen_opt *lopt; |
| 518 | struct rtattr *bc = NULL; |
| 519 | struct inet_sock *inet = inet_sk(sk); |
| 520 | int j, s_j; |
| 521 | int reqnum, s_reqnum; |
| 522 | int err = 0; |
| 523 | |
| 524 | s_j = cb->args[3]; |
| 525 | s_reqnum = cb->args[4]; |
| 526 | |
| 527 | if (s_j > 0) |
| 528 | s_j--; |
| 529 | |
| 530 | entry.family = sk->sk_family; |
| 531 | |
| 532 | read_lock_bh(&tp->syn_wait_lock); |
| 533 | |
| 534 | lopt = tp->listen_opt; |
| 535 | if (!lopt || !lopt->qlen) |
| 536 | goto out; |
| 537 | |
| 538 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
| 539 | bc = (struct rtattr *)(r + 1); |
| 540 | entry.sport = inet->num; |
| 541 | entry.userlocks = sk->sk_userlocks; |
| 542 | } |
| 543 | |
| 544 | for (j = s_j; j < TCP_SYNQ_HSIZE; j++) { |
| 545 | struct open_request *req, *head = lopt->syn_table[j]; |
| 546 | |
| 547 | reqnum = 0; |
| 548 | for (req = head; req; reqnum++, req = req->dl_next) { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 549 | struct inet_request_sock *ireq = inet_rsk(req); |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | if (reqnum < s_reqnum) |
| 552 | continue; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 553 | if (r->id.tcpdiag_dport != ireq->rmt_port && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | r->id.tcpdiag_dport) |
| 555 | continue; |
| 556 | |
| 557 | if (bc) { |
| 558 | entry.saddr = |
| 559 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 560 | (entry.family == AF_INET6) ? |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 561 | tcp6_rsk(req)->loc_addr.s6_addr32 : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | #endif |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 563 | &ireq->loc_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | entry.daddr = |
| 565 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
| 566 | (entry.family == AF_INET6) ? |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 567 | tcp6_rsk(req)->rmt_addr.s6_addr32 : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | #endif |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame^] | 569 | &ireq->rmt_addr; |
| 570 | entry.dport = ntohs(ireq->rmt_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
| 572 | if (!tcpdiag_bc_run(RTA_DATA(bc), |
| 573 | RTA_PAYLOAD(bc), &entry)) |
| 574 | continue; |
| 575 | } |
| 576 | |
| 577 | err = tcpdiag_fill_req(skb, sk, req, |
| 578 | NETLINK_CB(cb->skb).pid, |
| 579 | cb->nlh->nlmsg_seq); |
| 580 | if (err < 0) { |
| 581 | cb->args[3] = j + 1; |
| 582 | cb->args[4] = reqnum; |
| 583 | goto out; |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | s_reqnum = 0; |
| 588 | } |
| 589 | |
| 590 | out: |
| 591 | read_unlock_bh(&tp->syn_wait_lock); |
| 592 | |
| 593 | return err; |
| 594 | } |
| 595 | |
| 596 | static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 597 | { |
| 598 | int i, num; |
| 599 | int s_i, s_num; |
| 600 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); |
| 601 | |
| 602 | s_i = cb->args[1]; |
| 603 | s_num = num = cb->args[2]; |
| 604 | |
| 605 | if (cb->args[0] == 0) { |
| 606 | if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) |
| 607 | goto skip_listen_ht; |
| 608 | tcp_listen_lock(); |
| 609 | for (i = s_i; i < TCP_LHTABLE_SIZE; i++) { |
| 610 | struct sock *sk; |
| 611 | struct hlist_node *node; |
| 612 | |
| 613 | num = 0; |
| 614 | sk_for_each(sk, node, &tcp_listening_hash[i]) { |
| 615 | struct inet_sock *inet = inet_sk(sk); |
| 616 | |
| 617 | if (num < s_num) { |
| 618 | num++; |
| 619 | continue; |
| 620 | } |
| 621 | |
| 622 | if (r->id.tcpdiag_sport != inet->sport && |
| 623 | r->id.tcpdiag_sport) |
| 624 | goto next_listen; |
| 625 | |
| 626 | if (!(r->tcpdiag_states&TCPF_LISTEN) || |
| 627 | r->id.tcpdiag_dport || |
| 628 | cb->args[3] > 0) |
| 629 | goto syn_recv; |
| 630 | |
| 631 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { |
| 632 | tcp_listen_unlock(); |
| 633 | goto done; |
| 634 | } |
| 635 | |
| 636 | syn_recv: |
| 637 | if (!(r->tcpdiag_states&TCPF_SYN_RECV)) |
| 638 | goto next_listen; |
| 639 | |
| 640 | if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { |
| 641 | tcp_listen_unlock(); |
| 642 | goto done; |
| 643 | } |
| 644 | |
| 645 | next_listen: |
| 646 | cb->args[3] = 0; |
| 647 | cb->args[4] = 0; |
| 648 | ++num; |
| 649 | } |
| 650 | |
| 651 | s_num = 0; |
| 652 | cb->args[3] = 0; |
| 653 | cb->args[4] = 0; |
| 654 | } |
| 655 | tcp_listen_unlock(); |
| 656 | skip_listen_ht: |
| 657 | cb->args[0] = 1; |
| 658 | s_i = num = s_num = 0; |
| 659 | } |
| 660 | |
| 661 | if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) |
| 662 | return skb->len; |
| 663 | |
| 664 | for (i = s_i; i < tcp_ehash_size; i++) { |
| 665 | struct tcp_ehash_bucket *head = &tcp_ehash[i]; |
| 666 | struct sock *sk; |
| 667 | struct hlist_node *node; |
| 668 | |
| 669 | if (i > s_i) |
| 670 | s_num = 0; |
| 671 | |
| 672 | read_lock_bh(&head->lock); |
| 673 | |
| 674 | num = 0; |
| 675 | sk_for_each(sk, node, &head->chain) { |
| 676 | struct inet_sock *inet = inet_sk(sk); |
| 677 | |
| 678 | if (num < s_num) |
| 679 | goto next_normal; |
| 680 | if (!(r->tcpdiag_states & (1 << sk->sk_state))) |
| 681 | goto next_normal; |
| 682 | if (r->id.tcpdiag_sport != inet->sport && |
| 683 | r->id.tcpdiag_sport) |
| 684 | goto next_normal; |
| 685 | if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) |
| 686 | goto next_normal; |
| 687 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { |
| 688 | read_unlock_bh(&head->lock); |
| 689 | goto done; |
| 690 | } |
| 691 | next_normal: |
| 692 | ++num; |
| 693 | } |
| 694 | |
| 695 | if (r->tcpdiag_states&TCPF_TIME_WAIT) { |
| 696 | sk_for_each(sk, node, |
| 697 | &tcp_ehash[i + tcp_ehash_size].chain) { |
| 698 | struct inet_sock *inet = inet_sk(sk); |
| 699 | |
| 700 | if (num < s_num) |
| 701 | goto next_dying; |
| 702 | if (r->id.tcpdiag_sport != inet->sport && |
| 703 | r->id.tcpdiag_sport) |
| 704 | goto next_dying; |
| 705 | if (r->id.tcpdiag_dport != inet->dport && |
| 706 | r->id.tcpdiag_dport) |
| 707 | goto next_dying; |
| 708 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { |
| 709 | read_unlock_bh(&head->lock); |
| 710 | goto done; |
| 711 | } |
| 712 | next_dying: |
| 713 | ++num; |
| 714 | } |
| 715 | } |
| 716 | read_unlock_bh(&head->lock); |
| 717 | } |
| 718 | |
| 719 | done: |
| 720 | cb->args[1] = i; |
| 721 | cb->args[2] = num; |
| 722 | return skb->len; |
| 723 | } |
| 724 | |
| 725 | static int tcpdiag_dump_done(struct netlink_callback *cb) |
| 726 | { |
| 727 | return 0; |
| 728 | } |
| 729 | |
| 730 | |
| 731 | static __inline__ int |
| 732 | tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 733 | { |
| 734 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) |
| 735 | return 0; |
| 736 | |
| 737 | if (nlh->nlmsg_type != TCPDIAG_GETSOCK) |
| 738 | goto err_inval; |
| 739 | |
| 740 | if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) |
| 741 | goto err_inval; |
| 742 | |
| 743 | if (nlh->nlmsg_flags&NLM_F_DUMP) { |
| 744 | if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { |
| 745 | struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); |
| 746 | if (rta->rta_type != TCPDIAG_REQ_BYTECODE || |
| 747 | rta->rta_len < 8 || |
| 748 | rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) |
| 749 | goto err_inval; |
| 750 | if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) |
| 751 | goto err_inval; |
| 752 | } |
| 753 | return netlink_dump_start(tcpnl, skb, nlh, |
| 754 | tcpdiag_dump, |
| 755 | tcpdiag_dump_done); |
| 756 | } else { |
| 757 | return tcpdiag_get_exact(skb, nlh); |
| 758 | } |
| 759 | |
| 760 | err_inval: |
| 761 | return -EINVAL; |
| 762 | } |
| 763 | |
| 764 | |
| 765 | static inline void tcpdiag_rcv_skb(struct sk_buff *skb) |
| 766 | { |
| 767 | int err; |
| 768 | struct nlmsghdr * nlh; |
| 769 | |
| 770 | if (skb->len >= NLMSG_SPACE(0)) { |
| 771 | nlh = (struct nlmsghdr *)skb->data; |
| 772 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) |
| 773 | return; |
| 774 | err = tcpdiag_rcv_msg(skb, nlh); |
| 775 | if (err || nlh->nlmsg_flags & NLM_F_ACK) |
| 776 | netlink_ack(skb, nlh, err); |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | static void tcpdiag_rcv(struct sock *sk, int len) |
| 781 | { |
| 782 | struct sk_buff *skb; |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 783 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 785 | while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | tcpdiag_rcv_skb(skb); |
| 787 | kfree_skb(skb); |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | static int __init tcpdiag_init(void) |
| 792 | { |
| 793 | tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv); |
| 794 | if (tcpnl == NULL) |
| 795 | return -ENOMEM; |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | static void __exit tcpdiag_exit(void) |
| 800 | { |
| 801 | sock_release(tcpnl->sk_socket); |
| 802 | } |
| 803 | |
| 804 | module_init(tcpdiag_init); |
| 805 | module_exit(tcpdiag_exit); |
| 806 | MODULE_LICENSE("GPL"); |