Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
73c1f4a0 | 2 | * inet_diag.c Module for monitoring INET transport protocols sockets. |
1da177e4 | 3 | * |
1da177e4 LT |
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 | ||
172589cc | 12 | #include <linux/kernel.h> |
1da177e4 LT |
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> | |
505cbfc5 ACM |
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> | |
dc5fc579 | 29 | #include <net/netlink.h> |
1da177e4 LT |
30 | |
31 | #include <linux/inet.h> | |
32 | #include <linux/stddef.h> | |
33 | ||
a8c2190e | 34 | #include <linux/inet_diag.h> |
1da177e4 | 35 | |
4f5736c4 ACM |
36 | static const struct inet_diag_handler **inet_diag_table; |
37 | ||
73c1f4a0 | 38 | struct inet_diag_entry { |
9f855299 AV |
39 | __be32 *saddr; |
40 | __be32 *daddr; | |
1da177e4 LT |
41 | u16 sport; |
42 | u16 dport; | |
43 | u16 family; | |
44 | u16 userlocks; | |
45 | }; | |
46 | ||
73c1f4a0 | 47 | static struct sock *idiagnl; |
1da177e4 | 48 | |
73c1f4a0 | 49 | #define INET_DIAG_PUT(skb, attrtype, attrlen) \ |
7c99c909 | 50 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
1da177e4 | 51 | |
d523a328 HX |
52 | static DEFINE_MUTEX(inet_diag_table_mutex); |
53 | ||
54 | static const struct inet_diag_handler *inet_diag_lock_handler(int type) | |
55 | { | |
56 | #ifdef CONFIG_KMOD | |
57 | if (!inet_diag_table[type]) | |
58 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
59 | NETLINK_INET_DIAG, type); | |
60 | #endif | |
61 | ||
62 | mutex_lock(&inet_diag_table_mutex); | |
63 | if (!inet_diag_table[type]) | |
64 | return ERR_PTR(-ENOENT); | |
65 | ||
66 | return inet_diag_table[type]; | |
67 | } | |
68 | ||
69 | static inline void inet_diag_unlock_handler( | |
70 | const struct inet_diag_handler *handler) | |
71 | { | |
72 | mutex_unlock(&inet_diag_table_mutex); | |
73 | } | |
74 | ||
dff2c035 ACM |
75 | static int inet_csk_diag_fill(struct sock *sk, |
76 | struct sk_buff *skb, | |
77 | int ext, u32 pid, u32 seq, u16 nlmsg_flags, | |
78 | const struct nlmsghdr *unlh) | |
1da177e4 | 79 | { |
463c84b9 | 80 | const struct inet_sock *inet = inet_sk(sk); |
463c84b9 | 81 | const struct inet_connection_sock *icsk = inet_csk(sk); |
73c1f4a0 | 82 | struct inet_diag_msg *r; |
1da177e4 | 83 | struct nlmsghdr *nlh; |
4f5736c4 | 84 | void *info = NULL; |
73c1f4a0 | 85 | struct inet_diag_meminfo *minfo = NULL; |
27a884dc | 86 | unsigned char *b = skb_tail_pointer(skb); |
4f5736c4 ACM |
87 | const struct inet_diag_handler *handler; |
88 | ||
89 | handler = inet_diag_table[unlh->nlmsg_type]; | |
90 | BUG_ON(handler == NULL); | |
1da177e4 | 91 | |
540722ff | 92 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
1da177e4 | 93 | nlh->nlmsg_flags = nlmsg_flags; |
4f5736c4 | 94 | |
1da177e4 | 95 | r = NLMSG_DATA(nlh); |
c7d58aab ACM |
96 | BUG_ON(sk->sk_state == TCP_TIME_WAIT); |
97 | ||
98 | if (ext & (1 << (INET_DIAG_MEMINFO - 1))) | |
99 | minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); | |
100 | ||
101 | if (ext & (1 << (INET_DIAG_INFO - 1))) | |
102 | info = INET_DIAG_PUT(skb, INET_DIAG_INFO, | |
103 | handler->idiag_info_size); | |
104 | ||
105 | if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { | |
106 | const size_t len = strlen(icsk->icsk_ca_ops->name); | |
107 | ||
108 | strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), | |
109 | icsk->icsk_ca_ops->name); | |
1da177e4 | 110 | } |
c7d58aab | 111 | |
73c1f4a0 ACM |
112 | r->idiag_family = sk->sk_family; |
113 | r->idiag_state = sk->sk_state; | |
114 | r->idiag_timer = 0; | |
115 | r->idiag_retrans = 0; | |
1da177e4 | 116 | |
73c1f4a0 ACM |
117 | r->id.idiag_if = sk->sk_bound_dev_if; |
118 | r->id.idiag_cookie[0] = (u32)(unsigned long)sk; | |
119 | r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
1da177e4 | 120 | |
73c1f4a0 ACM |
121 | r->id.idiag_sport = inet->sport; |
122 | r->id.idiag_dport = inet->dport; | |
123 | r->id.idiag_src[0] = inet->rcv_saddr; | |
124 | r->id.idiag_dst[0] = inet->daddr; | |
1da177e4 | 125 | |
505cbfc5 | 126 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
73c1f4a0 | 127 | if (r->idiag_family == AF_INET6) { |
1da177e4 LT |
128 | struct ipv6_pinfo *np = inet6_sk(sk); |
129 | ||
73c1f4a0 | 130 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, |
1da177e4 | 131 | &np->rcv_saddr); |
73c1f4a0 | 132 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
1da177e4 LT |
133 | &np->daddr); |
134 | } | |
135 | #endif | |
136 | ||
172589cc | 137 | #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) |
1da177e4 | 138 | |
463c84b9 | 139 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
73c1f4a0 ACM |
140 | r->idiag_timer = 1; |
141 | r->idiag_retrans = icsk->icsk_retransmits; | |
142 | r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); | |
463c84b9 | 143 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
73c1f4a0 ACM |
144 | r->idiag_timer = 4; |
145 | r->idiag_retrans = icsk->icsk_probes_out; | |
146 | r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); | |
1da177e4 | 147 | } else if (timer_pending(&sk->sk_timer)) { |
73c1f4a0 ACM |
148 | r->idiag_timer = 2; |
149 | r->idiag_retrans = icsk->icsk_probes_out; | |
150 | r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); | |
1da177e4 | 151 | } else { |
73c1f4a0 ACM |
152 | r->idiag_timer = 0; |
153 | r->idiag_expires = 0; | |
1da177e4 LT |
154 | } |
155 | #undef EXPIRES_IN_MS | |
540722ff | 156 | |
73c1f4a0 ACM |
157 | r->idiag_uid = sock_i_uid(sk); |
158 | r->idiag_inode = sock_i_ino(sk); | |
1da177e4 LT |
159 | |
160 | if (minfo) { | |
73c1f4a0 ACM |
161 | minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); |
162 | minfo->idiag_wmem = sk->sk_wmem_queued; | |
163 | minfo->idiag_fmem = sk->sk_forward_alloc; | |
164 | minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); | |
1da177e4 LT |
165 | } |
166 | ||
4f5736c4 | 167 | handler->idiag_get_info(sk, r, info); |
1da177e4 | 168 | |
6687e988 ACM |
169 | if (sk->sk_state < TCP_TIME_WAIT && |
170 | icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) | |
171 | icsk->icsk_ca_ops->get_info(sk, ext, skb); | |
1da177e4 | 172 | |
27a884dc | 173 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
174 | return skb->len; |
175 | ||
7c99c909 | 176 | rtattr_failure: |
1da177e4 | 177 | nlmsg_failure: |
dc5fc579 | 178 | nlmsg_trim(skb, b); |
26932566 | 179 | return -EMSGSIZE; |
1da177e4 LT |
180 | } |
181 | ||
c7d58aab ACM |
182 | static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, |
183 | struct sk_buff *skb, int ext, u32 pid, | |
184 | u32 seq, u16 nlmsg_flags, | |
185 | const struct nlmsghdr *unlh) | |
186 | { | |
187 | long tmo; | |
188 | struct inet_diag_msg *r; | |
27a884dc | 189 | const unsigned char *previous_tail = skb_tail_pointer(skb); |
c7d58aab ACM |
190 | struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, |
191 | unlh->nlmsg_type, sizeof(*r)); | |
192 | ||
193 | r = NLMSG_DATA(nlh); | |
194 | BUG_ON(tw->tw_state != TCP_TIME_WAIT); | |
195 | ||
196 | nlh->nlmsg_flags = nlmsg_flags; | |
197 | ||
198 | tmo = tw->tw_ttd - jiffies; | |
199 | if (tmo < 0) | |
200 | tmo = 0; | |
201 | ||
202 | r->idiag_family = tw->tw_family; | |
203 | r->idiag_state = tw->tw_state; | |
204 | r->idiag_timer = 0; | |
205 | r->idiag_retrans = 0; | |
206 | r->id.idiag_if = tw->tw_bound_dev_if; | |
207 | r->id.idiag_cookie[0] = (u32)(unsigned long)tw; | |
208 | r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); | |
209 | r->id.idiag_sport = tw->tw_sport; | |
210 | r->id.idiag_dport = tw->tw_dport; | |
211 | r->id.idiag_src[0] = tw->tw_rcv_saddr; | |
212 | r->id.idiag_dst[0] = tw->tw_daddr; | |
213 | r->idiag_state = tw->tw_substate; | |
214 | r->idiag_timer = 3; | |
172589cc | 215 | r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); |
c7d58aab ACM |
216 | r->idiag_rqueue = 0; |
217 | r->idiag_wqueue = 0; | |
218 | r->idiag_uid = 0; | |
219 | r->idiag_inode = 0; | |
220 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
221 | if (tw->tw_family == AF_INET6) { | |
222 | const struct inet6_timewait_sock *tw6 = | |
223 | inet6_twsk((struct sock *)tw); | |
224 | ||
225 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, | |
226 | &tw6->tw_v6_rcv_saddr); | |
227 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, | |
228 | &tw6->tw_v6_daddr); | |
229 | } | |
230 | #endif | |
27a884dc | 231 | nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; |
c7d58aab ACM |
232 | return skb->len; |
233 | nlmsg_failure: | |
dc5fc579 | 234 | nlmsg_trim(skb, previous_tail); |
26932566 | 235 | return -EMSGSIZE; |
c7d58aab ACM |
236 | } |
237 | ||
dff2c035 ACM |
238 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
239 | int ext, u32 pid, u32 seq, u16 nlmsg_flags, | |
240 | const struct nlmsghdr *unlh) | |
241 | { | |
242 | if (sk->sk_state == TCP_TIME_WAIT) | |
243 | return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, | |
244 | skb, ext, pid, seq, nlmsg_flags, | |
245 | unlh); | |
246 | return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); | |
247 | } | |
248 | ||
4e852c02 ACM |
249 | static int inet_diag_get_exact(struct sk_buff *in_skb, |
250 | const struct nlmsghdr *nlh) | |
1da177e4 LT |
251 | { |
252 | int err; | |
253 | struct sock *sk; | |
73c1f4a0 | 254 | struct inet_diag_req *req = NLMSG_DATA(nlh); |
1da177e4 | 255 | struct sk_buff *rep; |
4f5736c4 ACM |
256 | struct inet_hashinfo *hashinfo; |
257 | const struct inet_diag_handler *handler; | |
258 | ||
d523a328 | 259 | handler = inet_diag_lock_handler(nlh->nlmsg_type); |
8cf8e5a6 ACM |
260 | if (IS_ERR(handler)) { |
261 | err = PTR_ERR(handler); | |
262 | goto unlock; | |
263 | } | |
d523a328 | 264 | |
4f5736c4 | 265 | hashinfo = handler->idiag_hashinfo; |
d523a328 | 266 | err = -EINVAL; |
4f5736c4 | 267 | |
73c1f4a0 | 268 | if (req->idiag_family == AF_INET) { |
c67499c0 | 269 | sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], |
73c1f4a0 ACM |
270 | req->id.idiag_dport, req->id.idiag_src[0], |
271 | req->id.idiag_sport, req->id.idiag_if); | |
1da177e4 | 272 | } |
505cbfc5 | 273 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
73c1f4a0 | 274 | else if (req->idiag_family == AF_INET6) { |
d86e0dac | 275 | sk = inet6_lookup(&init_net, hashinfo, |
73c1f4a0 ACM |
276 | (struct in6_addr *)req->id.idiag_dst, |
277 | req->id.idiag_dport, | |
278 | (struct in6_addr *)req->id.idiag_src, | |
279 | req->id.idiag_sport, | |
280 | req->id.idiag_if); | |
1da177e4 LT |
281 | } |
282 | #endif | |
283 | else { | |
d523a328 | 284 | goto unlock; |
1da177e4 LT |
285 | } |
286 | ||
d523a328 | 287 | err = -ENOENT; |
1da177e4 | 288 | if (sk == NULL) |
d523a328 | 289 | goto unlock; |
1da177e4 LT |
290 | |
291 | err = -ESTALE; | |
73c1f4a0 ACM |
292 | if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || |
293 | req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && | |
294 | ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || | |
295 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) | |
1da177e4 LT |
296 | goto out; |
297 | ||
298 | err = -ENOMEM; | |
73c1f4a0 ACM |
299 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + |
300 | sizeof(struct inet_diag_meminfo) + | |
4f5736c4 ACM |
301 | handler->idiag_info_size + 64)), |
302 | GFP_KERNEL); | |
1da177e4 LT |
303 | if (!rep) |
304 | goto out; | |
305 | ||
26932566 PM |
306 | err = sk_diag_fill(sk, rep, req->idiag_ext, |
307 | NETLINK_CB(in_skb).pid, | |
308 | nlh->nlmsg_seq, 0, nlh); | |
309 | if (err < 0) { | |
310 | WARN_ON(err == -EMSGSIZE); | |
311 | kfree_skb(rep); | |
312 | goto out; | |
313 | } | |
73c1f4a0 ACM |
314 | err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, |
315 | MSG_DONTWAIT); | |
1da177e4 LT |
316 | if (err > 0) |
317 | err = 0; | |
318 | ||
319 | out: | |
320 | if (sk) { | |
321 | if (sk->sk_state == TCP_TIME_WAIT) | |
8feaf0c0 | 322 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
323 | else |
324 | sock_put(sk); | |
325 | } | |
d523a328 HX |
326 | unlock: |
327 | inet_diag_unlock_handler(handler); | |
1da177e4 LT |
328 | return err; |
329 | } | |
330 | ||
9f855299 | 331 | static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) |
1da177e4 LT |
332 | { |
333 | int words = bits >> 5; | |
334 | ||
335 | bits &= 0x1f; | |
336 | ||
337 | if (words) { | |
338 | if (memcmp(a1, a2, words << 2)) | |
339 | return 0; | |
340 | } | |
341 | if (bits) { | |
9f855299 AV |
342 | __be32 w1, w2; |
343 | __be32 mask; | |
1da177e4 LT |
344 | |
345 | w1 = a1[words]; | |
346 | w2 = a2[words]; | |
347 | ||
348 | mask = htonl((0xffffffff) << (32 - bits)); | |
349 | ||
350 | if ((w1 ^ w2) & mask) | |
351 | return 0; | |
352 | } | |
353 | ||
354 | return 1; | |
355 | } | |
356 | ||
357 | ||
73c1f4a0 | 358 | static int inet_diag_bc_run(const void *bc, int len, |
4e852c02 | 359 | const struct inet_diag_entry *entry) |
1da177e4 LT |
360 | { |
361 | while (len > 0) { | |
362 | int yes = 1; | |
73c1f4a0 | 363 | const struct inet_diag_bc_op *op = bc; |
1da177e4 LT |
364 | |
365 | switch (op->code) { | |
73c1f4a0 | 366 | case INET_DIAG_BC_NOP: |
1da177e4 | 367 | break; |
73c1f4a0 | 368 | case INET_DIAG_BC_JMP: |
1da177e4 LT |
369 | yes = 0; |
370 | break; | |
73c1f4a0 | 371 | case INET_DIAG_BC_S_GE: |
1da177e4 LT |
372 | yes = entry->sport >= op[1].no; |
373 | break; | |
73c1f4a0 | 374 | case INET_DIAG_BC_S_LE: |
1da177e4 LT |
375 | yes = entry->dport <= op[1].no; |
376 | break; | |
73c1f4a0 | 377 | case INET_DIAG_BC_D_GE: |
1da177e4 LT |
378 | yes = entry->dport >= op[1].no; |
379 | break; | |
73c1f4a0 | 380 | case INET_DIAG_BC_D_LE: |
1da177e4 LT |
381 | yes = entry->dport <= op[1].no; |
382 | break; | |
73c1f4a0 | 383 | case INET_DIAG_BC_AUTO: |
1da177e4 LT |
384 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
385 | break; | |
73c1f4a0 | 386 | case INET_DIAG_BC_S_COND: |
a8c2190e ACM |
387 | case INET_DIAG_BC_D_COND: { |
388 | struct inet_diag_hostcond *cond; | |
9f855299 | 389 | __be32 *addr; |
1da177e4 | 390 | |
a8c2190e | 391 | cond = (struct inet_diag_hostcond *)(op + 1); |
1da177e4 | 392 | if (cond->port != -1 && |
73c1f4a0 | 393 | cond->port != (op->code == INET_DIAG_BC_S_COND ? |
1da177e4 LT |
394 | entry->sport : entry->dport)) { |
395 | yes = 0; | |
396 | break; | |
397 | } | |
4e852c02 | 398 | |
1da177e4 LT |
399 | if (cond->prefix_len == 0) |
400 | break; | |
401 | ||
73c1f4a0 | 402 | if (op->code == INET_DIAG_BC_S_COND) |
1da177e4 LT |
403 | addr = entry->saddr; |
404 | else | |
405 | addr = entry->daddr; | |
406 | ||
4e852c02 ACM |
407 | if (bitstring_match(addr, cond->addr, |
408 | cond->prefix_len)) | |
1da177e4 LT |
409 | break; |
410 | if (entry->family == AF_INET6 && | |
411 | cond->family == AF_INET) { | |
412 | if (addr[0] == 0 && addr[1] == 0 && | |
413 | addr[2] == htonl(0xffff) && | |
a8c2190e | 414 | bitstring_match(addr + 3, cond->addr, |
e905a9ed | 415 | cond->prefix_len)) |
1da177e4 LT |
416 | break; |
417 | } | |
418 | yes = 0; | |
419 | break; | |
420 | } | |
421 | } | |
422 | ||
4e852c02 | 423 | if (yes) { |
1da177e4 LT |
424 | len -= op->yes; |
425 | bc += op->yes; | |
426 | } else { | |
427 | len -= op->no; | |
428 | bc += op->no; | |
429 | } | |
430 | } | |
431 | return (len == 0); | |
432 | } | |
433 | ||
434 | static int valid_cc(const void *bc, int len, int cc) | |
435 | { | |
436 | while (len >= 0) { | |
73c1f4a0 | 437 | const struct inet_diag_bc_op *op = bc; |
1da177e4 LT |
438 | |
439 | if (cc > len) | |
440 | return 0; | |
441 | if (cc == len) | |
442 | return 1; | |
443 | if (op->yes < 4) | |
444 | return 0; | |
445 | len -= op->yes; | |
446 | bc += op->yes; | |
447 | } | |
448 | return 0; | |
449 | } | |
450 | ||
73c1f4a0 | 451 | static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) |
1da177e4 LT |
452 | { |
453 | const unsigned char *bc = bytecode; | |
454 | int len = bytecode_len; | |
455 | ||
456 | while (len > 0) { | |
a8c2190e | 457 | struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; |
1da177e4 LT |
458 | |
459 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); | |
460 | switch (op->code) { | |
73c1f4a0 ACM |
461 | case INET_DIAG_BC_AUTO: |
462 | case INET_DIAG_BC_S_COND: | |
463 | case INET_DIAG_BC_D_COND: | |
464 | case INET_DIAG_BC_S_GE: | |
465 | case INET_DIAG_BC_S_LE: | |
466 | case INET_DIAG_BC_D_GE: | |
467 | case INET_DIAG_BC_D_LE: | |
a8c2190e | 468 | if (op->yes < 4 || op->yes > len + 4) |
1da177e4 | 469 | return -EINVAL; |
73c1f4a0 | 470 | case INET_DIAG_BC_JMP: |
a8c2190e | 471 | if (op->no < 4 || op->no > len + 4) |
1da177e4 LT |
472 | return -EINVAL; |
473 | if (op->no < len && | |
a8c2190e | 474 | !valid_cc(bytecode, bytecode_len, len - op->no)) |
1da177e4 LT |
475 | return -EINVAL; |
476 | break; | |
73c1f4a0 | 477 | case INET_DIAG_BC_NOP: |
a8c2190e | 478 | if (op->yes < 4 || op->yes > len + 4) |
1da177e4 LT |
479 | return -EINVAL; |
480 | break; | |
481 | default: | |
482 | return -EINVAL; | |
483 | } | |
4e852c02 | 484 | bc += op->yes; |
1da177e4 LT |
485 | len -= op->yes; |
486 | } | |
487 | return len == 0 ? 0 : -EINVAL; | |
488 | } | |
489 | ||
dff2c035 ACM |
490 | static int inet_csk_diag_dump(struct sock *sk, |
491 | struct sk_buff *skb, | |
492 | struct netlink_callback *cb) | |
1da177e4 | 493 | { |
73c1f4a0 | 494 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
1da177e4 LT |
495 | |
496 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
73c1f4a0 | 497 | struct inet_diag_entry entry; |
1da177e4 LT |
498 | struct rtattr *bc = (struct rtattr *)(r + 1); |
499 | struct inet_sock *inet = inet_sk(sk); | |
500 | ||
501 | entry.family = sk->sk_family; | |
505cbfc5 | 502 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 LT |
503 | if (entry.family == AF_INET6) { |
504 | struct ipv6_pinfo *np = inet6_sk(sk); | |
505 | ||
506 | entry.saddr = np->rcv_saddr.s6_addr32; | |
507 | entry.daddr = np->daddr.s6_addr32; | |
508 | } else | |
509 | #endif | |
510 | { | |
511 | entry.saddr = &inet->rcv_saddr; | |
512 | entry.daddr = &inet->daddr; | |
513 | } | |
514 | entry.sport = inet->num; | |
515 | entry.dport = ntohs(inet->dport); | |
516 | entry.userlocks = sk->sk_userlocks; | |
517 | ||
73c1f4a0 | 518 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
1da177e4 LT |
519 | return 0; |
520 | } | |
521 | ||
dff2c035 ACM |
522 | return inet_csk_diag_fill(sk, skb, r->idiag_ext, |
523 | NETLINK_CB(cb->skb).pid, | |
524 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); | |
1da177e4 LT |
525 | } |
526 | ||
c7d58aab ACM |
527 | static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, |
528 | struct sk_buff *skb, | |
529 | struct netlink_callback *cb) | |
530 | { | |
531 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); | |
532 | ||
533 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
534 | struct inet_diag_entry entry; | |
535 | struct rtattr *bc = (struct rtattr *)(r + 1); | |
536 | ||
537 | entry.family = tw->tw_family; | |
538 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
539 | if (tw->tw_family == AF_INET6) { | |
540 | struct inet6_timewait_sock *tw6 = | |
541 | inet6_twsk((struct sock *)tw); | |
542 | entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; | |
543 | entry.daddr = tw6->tw_v6_daddr.s6_addr32; | |
544 | } else | |
545 | #endif | |
546 | { | |
547 | entry.saddr = &tw->tw_rcv_saddr; | |
548 | entry.daddr = &tw->tw_daddr; | |
549 | } | |
550 | entry.sport = tw->tw_num; | |
551 | entry.dport = ntohs(tw->tw_dport); | |
e905a9ed | 552 | entry.userlocks = 0; |
c7d58aab ACM |
553 | |
554 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) | |
555 | return 0; | |
556 | } | |
557 | ||
558 | return inet_twsk_diag_fill(tw, skb, r->idiag_ext, | |
559 | NETLINK_CB(cb->skb).pid, | |
560 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); | |
561 | } | |
562 | ||
73c1f4a0 | 563 | static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, |
4e852c02 ACM |
564 | struct request_sock *req, u32 pid, u32 seq, |
565 | const struct nlmsghdr *unlh) | |
1da177e4 | 566 | { |
2e6599cb | 567 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 568 | struct inet_sock *inet = inet_sk(sk); |
27a884dc | 569 | unsigned char *b = skb_tail_pointer(skb); |
73c1f4a0 | 570 | struct inet_diag_msg *r; |
1da177e4 LT |
571 | struct nlmsghdr *nlh; |
572 | long tmo; | |
573 | ||
540722ff | 574 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
1da177e4 LT |
575 | nlh->nlmsg_flags = NLM_F_MULTI; |
576 | r = NLMSG_DATA(nlh); | |
577 | ||
73c1f4a0 ACM |
578 | r->idiag_family = sk->sk_family; |
579 | r->idiag_state = TCP_SYN_RECV; | |
580 | r->idiag_timer = 1; | |
581 | r->idiag_retrans = req->retrans; | |
1da177e4 | 582 | |
73c1f4a0 ACM |
583 | r->id.idiag_if = sk->sk_bound_dev_if; |
584 | r->id.idiag_cookie[0] = (u32)(unsigned long)req; | |
585 | r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); | |
1da177e4 LT |
586 | |
587 | tmo = req->expires - jiffies; | |
588 | if (tmo < 0) | |
589 | tmo = 0; | |
590 | ||
73c1f4a0 ACM |
591 | r->id.idiag_sport = inet->sport; |
592 | r->id.idiag_dport = ireq->rmt_port; | |
593 | r->id.idiag_src[0] = ireq->loc_addr; | |
594 | r->id.idiag_dst[0] = ireq->rmt_addr; | |
595 | r->idiag_expires = jiffies_to_msecs(tmo); | |
596 | r->idiag_rqueue = 0; | |
597 | r->idiag_wqueue = 0; | |
598 | r->idiag_uid = sock_i_uid(sk); | |
599 | r->idiag_inode = 0; | |
505cbfc5 | 600 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
73c1f4a0 ACM |
601 | if (r->idiag_family == AF_INET6) { |
602 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, | |
ca304b61 | 603 | &inet6_rsk(req)->loc_addr); |
73c1f4a0 | 604 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
ca304b61 | 605 | &inet6_rsk(req)->rmt_addr); |
1da177e4 LT |
606 | } |
607 | #endif | |
27a884dc | 608 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
609 | |
610 | return skb->len; | |
611 | ||
612 | nlmsg_failure: | |
dc5fc579 | 613 | nlmsg_trim(skb, b); |
1da177e4 LT |
614 | return -1; |
615 | } | |
616 | ||
73c1f4a0 | 617 | static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, |
4e852c02 | 618 | struct netlink_callback *cb) |
1da177e4 | 619 | { |
73c1f4a0 ACM |
620 | struct inet_diag_entry entry; |
621 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); | |
463c84b9 | 622 | struct inet_connection_sock *icsk = inet_csk(sk); |
2ad69c55 | 623 | struct listen_sock *lopt; |
1da177e4 LT |
624 | struct rtattr *bc = NULL; |
625 | struct inet_sock *inet = inet_sk(sk); | |
626 | int j, s_j; | |
627 | int reqnum, s_reqnum; | |
628 | int err = 0; | |
629 | ||
630 | s_j = cb->args[3]; | |
631 | s_reqnum = cb->args[4]; | |
632 | ||
633 | if (s_j > 0) | |
634 | s_j--; | |
635 | ||
636 | entry.family = sk->sk_family; | |
637 | ||
463c84b9 | 638 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 639 | |
463c84b9 | 640 | lopt = icsk->icsk_accept_queue.listen_opt; |
1da177e4 LT |
641 | if (!lopt || !lopt->qlen) |
642 | goto out; | |
643 | ||
644 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
645 | bc = (struct rtattr *)(r + 1); | |
646 | entry.sport = inet->num; | |
647 | entry.userlocks = sk->sk_userlocks; | |
648 | } | |
649 | ||
540722ff | 650 | for (j = s_j; j < lopt->nr_table_entries; j++) { |
60236fdd | 651 | struct request_sock *req, *head = lopt->syn_table[j]; |
1da177e4 LT |
652 | |
653 | reqnum = 0; | |
654 | for (req = head; req; reqnum++, req = req->dl_next) { | |
2e6599cb ACM |
655 | struct inet_request_sock *ireq = inet_rsk(req); |
656 | ||
1da177e4 LT |
657 | if (reqnum < s_reqnum) |
658 | continue; | |
73c1f4a0 ACM |
659 | if (r->id.idiag_dport != ireq->rmt_port && |
660 | r->id.idiag_dport) | |
1da177e4 LT |
661 | continue; |
662 | ||
663 | if (bc) { | |
664 | entry.saddr = | |
505cbfc5 | 665 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 666 | (entry.family == AF_INET6) ? |
ca304b61 | 667 | inet6_rsk(req)->loc_addr.s6_addr32 : |
1da177e4 | 668 | #endif |
2e6599cb | 669 | &ireq->loc_addr; |
4e852c02 | 670 | entry.daddr = |
505cbfc5 | 671 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 672 | (entry.family == AF_INET6) ? |
ca304b61 | 673 | inet6_rsk(req)->rmt_addr.s6_addr32 : |
1da177e4 | 674 | #endif |
2e6599cb ACM |
675 | &ireq->rmt_addr; |
676 | entry.dport = ntohs(ireq->rmt_port); | |
1da177e4 | 677 | |
73c1f4a0 | 678 | if (!inet_diag_bc_run(RTA_DATA(bc), |
1da177e4 LT |
679 | RTA_PAYLOAD(bc), &entry)) |
680 | continue; | |
681 | } | |
682 | ||
73c1f4a0 | 683 | err = inet_diag_fill_req(skb, sk, req, |
1da177e4 | 684 | NETLINK_CB(cb->skb).pid, |
540722ff | 685 | cb->nlh->nlmsg_seq, cb->nlh); |
1da177e4 LT |
686 | if (err < 0) { |
687 | cb->args[3] = j + 1; | |
688 | cb->args[4] = reqnum; | |
689 | goto out; | |
690 | } | |
691 | } | |
692 | ||
693 | s_reqnum = 0; | |
694 | } | |
695 | ||
696 | out: | |
463c84b9 | 697 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
698 | |
699 | return err; | |
700 | } | |
701 | ||
73c1f4a0 | 702 | static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
703 | { |
704 | int i, num; | |
705 | int s_i, s_num; | |
73c1f4a0 | 706 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
4f5736c4 | 707 | const struct inet_diag_handler *handler; |
540722ff | 708 | struct inet_hashinfo *hashinfo; |
1da177e4 | 709 | |
d523a328 | 710 | handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); |
8cf8e5a6 ACM |
711 | if (IS_ERR(handler)) |
712 | goto unlock; | |
d523a328 | 713 | |
4f5736c4 | 714 | hashinfo = handler->idiag_hashinfo; |
4e852c02 | 715 | |
1da177e4 LT |
716 | s_i = cb->args[1]; |
717 | s_num = num = cb->args[2]; | |
4f5736c4 | 718 | |
1da177e4 | 719 | if (cb->args[0] == 0) { |
73c1f4a0 | 720 | if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) |
1da177e4 | 721 | goto skip_listen_ht; |
540722ff ACM |
722 | |
723 | inet_listen_lock(hashinfo); | |
0f7ff927 | 724 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
1da177e4 LT |
725 | struct sock *sk; |
726 | struct hlist_node *node; | |
727 | ||
728 | num = 0; | |
540722ff | 729 | sk_for_each(sk, node, &hashinfo->listening_hash[i]) { |
1da177e4 LT |
730 | struct inet_sock *inet = inet_sk(sk); |
731 | ||
732 | if (num < s_num) { | |
733 | num++; | |
734 | continue; | |
735 | } | |
736 | ||
73c1f4a0 ACM |
737 | if (r->id.idiag_sport != inet->sport && |
738 | r->id.idiag_sport) | |
1da177e4 LT |
739 | goto next_listen; |
740 | ||
73c1f4a0 ACM |
741 | if (!(r->idiag_states & TCPF_LISTEN) || |
742 | r->id.idiag_dport || | |
1da177e4 LT |
743 | cb->args[3] > 0) |
744 | goto syn_recv; | |
745 | ||
dff2c035 | 746 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
540722ff | 747 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
748 | goto done; |
749 | } | |
750 | ||
751 | syn_recv: | |
73c1f4a0 | 752 | if (!(r->idiag_states & TCPF_SYN_RECV)) |
1da177e4 LT |
753 | goto next_listen; |
754 | ||
73c1f4a0 | 755 | if (inet_diag_dump_reqs(skb, sk, cb) < 0) { |
540722ff | 756 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
757 | goto done; |
758 | } | |
759 | ||
760 | next_listen: | |
761 | cb->args[3] = 0; | |
762 | cb->args[4] = 0; | |
763 | ++num; | |
764 | } | |
765 | ||
766 | s_num = 0; | |
767 | cb->args[3] = 0; | |
768 | cb->args[4] = 0; | |
769 | } | |
540722ff | 770 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
771 | skip_listen_ht: |
772 | cb->args[0] = 1; | |
773 | s_i = num = s_num = 0; | |
774 | } | |
775 | ||
73c1f4a0 | 776 | if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) |
d523a328 | 777 | goto unlock; |
1da177e4 | 778 | |
540722ff ACM |
779 | for (i = s_i; i < hashinfo->ehash_size; i++) { |
780 | struct inet_ehash_bucket *head = &hashinfo->ehash[i]; | |
230140cf | 781 | rwlock_t *lock = inet_ehash_lockp(hashinfo, i); |
1da177e4 LT |
782 | struct sock *sk; |
783 | struct hlist_node *node; | |
784 | ||
785 | if (i > s_i) | |
786 | s_num = 0; | |
787 | ||
230140cf | 788 | read_lock_bh(lock); |
1da177e4 LT |
789 | num = 0; |
790 | sk_for_each(sk, node, &head->chain) { | |
791 | struct inet_sock *inet = inet_sk(sk); | |
792 | ||
793 | if (num < s_num) | |
794 | goto next_normal; | |
73c1f4a0 | 795 | if (!(r->idiag_states & (1 << sk->sk_state))) |
1da177e4 | 796 | goto next_normal; |
73c1f4a0 ACM |
797 | if (r->id.idiag_sport != inet->sport && |
798 | r->id.idiag_sport) | |
1da177e4 | 799 | goto next_normal; |
4e852c02 ACM |
800 | if (r->id.idiag_dport != inet->dport && |
801 | r->id.idiag_dport) | |
1da177e4 | 802 | goto next_normal; |
dff2c035 | 803 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
230140cf | 804 | read_unlock_bh(lock); |
1da177e4 LT |
805 | goto done; |
806 | } | |
807 | next_normal: | |
808 | ++num; | |
809 | } | |
810 | ||
73c1f4a0 | 811 | if (r->idiag_states & TCPF_TIME_WAIT) { |
c7d58aab ACM |
812 | struct inet_timewait_sock *tw; |
813 | ||
814 | inet_twsk_for_each(tw, node, | |
dbca9b27 | 815 | &head->twchain) { |
1da177e4 LT |
816 | |
817 | if (num < s_num) | |
818 | goto next_dying; | |
7dbf0755 | 819 | if (r->id.idiag_sport != tw->tw_sport && |
73c1f4a0 | 820 | r->id.idiag_sport) |
1da177e4 | 821 | goto next_dying; |
7dbf0755 | 822 | if (r->id.idiag_dport != tw->tw_dport && |
73c1f4a0 | 823 | r->id.idiag_dport) |
1da177e4 | 824 | goto next_dying; |
c7d58aab | 825 | if (inet_twsk_diag_dump(tw, skb, cb) < 0) { |
230140cf | 826 | read_unlock_bh(lock); |
1da177e4 LT |
827 | goto done; |
828 | } | |
829 | next_dying: | |
830 | ++num; | |
831 | } | |
832 | } | |
230140cf | 833 | read_unlock_bh(lock); |
1da177e4 LT |
834 | } |
835 | ||
836 | done: | |
837 | cb->args[1] = i; | |
838 | cb->args[2] = num; | |
d523a328 HX |
839 | unlock: |
840 | inet_diag_unlock_handler(handler); | |
1da177e4 LT |
841 | return skb->len; |
842 | } | |
843 | ||
ead592ba | 844 | static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 845 | { |
ead592ba | 846 | int hdrlen = sizeof(struct inet_diag_req); |
1da177e4 | 847 | |
ead592ba TG |
848 | if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
849 | nlmsg_len(nlh) < hdrlen) | |
850 | return -EINVAL; | |
1da177e4 | 851 | |
ead592ba | 852 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
ead592ba TG |
853 | if (nlmsg_attrlen(nlh, hdrlen)) { |
854 | struct nlattr *attr; | |
1da177e4 | 855 | |
ead592ba TG |
856 | attr = nlmsg_find_attr(nlh, hdrlen, |
857 | INET_DIAG_REQ_BYTECODE); | |
858 | if (attr == NULL || | |
859 | nla_len(attr) < sizeof(struct inet_diag_bc_op) || | |
860 | inet_diag_bc_audit(nla_data(attr), nla_len(attr))) | |
861 | return -EINVAL; | |
862 | } | |
1da177e4 | 863 | |
c702e804 TG |
864 | return netlink_dump_start(idiagnl, skb, nlh, |
865 | inet_diag_dump, NULL); | |
1da177e4 | 866 | } |
ead592ba TG |
867 | |
868 | return inet_diag_get_exact(skb, nlh); | |
1da177e4 LT |
869 | } |
870 | ||
0a9c7301 PM |
871 | static DEFINE_MUTEX(inet_diag_mutex); |
872 | ||
cd40b7d3 | 873 | static void inet_diag_rcv(struct sk_buff *skb) |
1da177e4 | 874 | { |
cd40b7d3 DL |
875 | mutex_lock(&inet_diag_mutex); |
876 | netlink_rcv_skb(skb, &inet_diag_rcv_msg); | |
877 | mutex_unlock(&inet_diag_mutex); | |
1da177e4 LT |
878 | } |
879 | ||
4f5736c4 ACM |
880 | int inet_diag_register(const struct inet_diag_handler *h) |
881 | { | |
882 | const __u16 type = h->idiag_type; | |
883 | int err = -EINVAL; | |
884 | ||
885 | if (type >= INET_DIAG_GETSOCK_MAX) | |
886 | goto out; | |
887 | ||
d523a328 | 888 | mutex_lock(&inet_diag_table_mutex); |
4f5736c4 ACM |
889 | err = -EEXIST; |
890 | if (inet_diag_table[type] == NULL) { | |
891 | inet_diag_table[type] = h; | |
892 | err = 0; | |
893 | } | |
d523a328 | 894 | mutex_unlock(&inet_diag_table_mutex); |
4f5736c4 ACM |
895 | out: |
896 | return err; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(inet_diag_register); | |
899 | ||
900 | void inet_diag_unregister(const struct inet_diag_handler *h) | |
901 | { | |
902 | const __u16 type = h->idiag_type; | |
903 | ||
904 | if (type >= INET_DIAG_GETSOCK_MAX) | |
905 | return; | |
906 | ||
d523a328 | 907 | mutex_lock(&inet_diag_table_mutex); |
4f5736c4 | 908 | inet_diag_table[type] = NULL; |
d523a328 | 909 | mutex_unlock(&inet_diag_table_mutex); |
4f5736c4 ACM |
910 | } |
911 | EXPORT_SYMBOL_GPL(inet_diag_unregister); | |
912 | ||
73c1f4a0 | 913 | static int __init inet_diag_init(void) |
1da177e4 | 914 | { |
4f5736c4 ACM |
915 | const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * |
916 | sizeof(struct inet_diag_handler *)); | |
917 | int err = -ENOMEM; | |
918 | ||
0da974f4 | 919 | inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
4f5736c4 ACM |
920 | if (!inet_diag_table) |
921 | goto out; | |
922 | ||
b4b51029 | 923 | idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, |
d523a328 | 924 | inet_diag_rcv, NULL, THIS_MODULE); |
73c1f4a0 | 925 | if (idiagnl == NULL) |
4f5736c4 | 926 | goto out_free_table; |
17b085ea | 927 | err = 0; |
4f5736c4 ACM |
928 | out: |
929 | return err; | |
4f5736c4 ACM |
930 | out_free_table: |
931 | kfree(inet_diag_table); | |
932 | goto out; | |
1da177e4 LT |
933 | } |
934 | ||
73c1f4a0 | 935 | static void __exit inet_diag_exit(void) |
1da177e4 | 936 | { |
b7c6ba6e | 937 | netlink_kernel_release(idiagnl); |
4f5736c4 | 938 | kfree(inet_diag_table); |
1da177e4 LT |
939 | } |
940 | ||
73c1f4a0 ACM |
941 | module_init(inet_diag_init); |
942 | module_exit(inet_diag_exit); | |
1da177e4 | 943 | MODULE_LICENSE("GPL"); |
305e1e96 | 944 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); |