Commit | Line | Data |
---|---|---|
22931d3b PE |
1 | #include <linux/types.h> |
2 | #include <linux/spinlock.h> | |
3 | #include <linux/sock_diag.h> | |
4 | #include <linux/unix_diag.h> | |
5 | #include <linux/skbuff.h> | |
2ea744a5 | 6 | #include <linux/module.h> |
22931d3b PE |
7 | #include <net/netlink.h> |
8 | #include <net/af_unix.h> | |
9 | #include <net/tcp_states.h> | |
10 | ||
11 | #define UNIX_DIAG_PUT(skb, attrtype, attrlen) \ | |
12 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) | |
13 | ||
f5248b48 PE |
14 | static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb) |
15 | { | |
16 | struct unix_address *addr = unix_sk(sk)->addr; | |
17 | char *s; | |
18 | ||
19 | if (addr) { | |
20 | s = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short)); | |
21 | memcpy(s, addr->name->sun_path, addr->len - sizeof(short)); | |
22 | } | |
23 | ||
24 | return 0; | |
25 | ||
26 | rtattr_failure: | |
27 | return -EMSGSIZE; | |
28 | } | |
29 | ||
5f7b0569 PE |
30 | static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb) |
31 | { | |
32 | struct dentry *dentry = unix_sk(sk)->dentry; | |
33 | struct unix_diag_vfs *uv; | |
34 | ||
35 | if (dentry) { | |
36 | uv = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_VFS, sizeof(*uv)); | |
37 | uv->udiag_vfs_ino = dentry->d_inode->i_ino; | |
38 | uv->udiag_vfs_dev = dentry->d_sb->s_dev; | |
39 | } | |
40 | ||
41 | return 0; | |
42 | ||
43 | rtattr_failure: | |
44 | return -EMSGSIZE; | |
45 | } | |
46 | ||
ac02be8d PE |
47 | static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb) |
48 | { | |
49 | struct sock *peer; | |
50 | int ino; | |
51 | ||
52 | peer = unix_peer_get(sk); | |
53 | if (peer) { | |
54 | unix_state_lock(peer); | |
55 | ino = sock_i_ino(peer); | |
56 | unix_state_unlock(peer); | |
57 | sock_put(peer); | |
58 | ||
59 | RTA_PUT_U32(nlskb, UNIX_DIAG_PEER, ino); | |
60 | } | |
61 | ||
62 | return 0; | |
63 | rtattr_failure: | |
64 | return -EMSGSIZE; | |
65 | } | |
66 | ||
2aac7a2c PE |
67 | static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb) |
68 | { | |
69 | struct sk_buff *skb; | |
70 | u32 *buf; | |
71 | int i; | |
72 | ||
73 | if (sk->sk_state == TCP_LISTEN) { | |
74 | spin_lock(&sk->sk_receive_queue.lock); | |
3b0723c1 PE |
75 | buf = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_ICONS, |
76 | sk->sk_receive_queue.qlen * sizeof(u32)); | |
2aac7a2c PE |
77 | i = 0; |
78 | skb_queue_walk(&sk->sk_receive_queue, skb) { | |
79 | struct sock *req, *peer; | |
80 | ||
81 | req = skb->sk; | |
82 | /* | |
83 | * The state lock is outer for the same sk's | |
84 | * queue lock. With the other's queue locked it's | |
85 | * OK to lock the state. | |
86 | */ | |
87 | unix_state_lock_nested(req); | |
88 | peer = unix_sk(req)->peer; | |
e09e9d18 | 89 | buf[i++] = (peer ? sock_i_ino(peer) : 0); |
2aac7a2c PE |
90 | unix_state_unlock(req); |
91 | } | |
92 | spin_unlock(&sk->sk_receive_queue.lock); | |
93 | } | |
94 | ||
95 | return 0; | |
96 | ||
97 | rtattr_failure: | |
98 | spin_unlock(&sk->sk_receive_queue.lock); | |
99 | return -EMSGSIZE; | |
100 | } | |
101 | ||
cbf39195 PE |
102 | static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb) |
103 | { | |
c9da99e6 PE |
104 | struct unix_diag_rqlen *rql; |
105 | ||
106 | rql = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_RQLEN, sizeof(*rql)); | |
107 | ||
108 | if (sk->sk_state == TCP_LISTEN) { | |
109 | rql->udiag_rqueue = sk->sk_receive_queue.qlen; | |
110 | rql->udiag_wqueue = sk->sk_max_ack_backlog; | |
111 | } else { | |
112 | rql->udiag_rqueue = (__u32)unix_inq_len(sk); | |
113 | rql->udiag_wqueue = (__u32)unix_outq_len(sk); | |
114 | } | |
115 | ||
cbf39195 PE |
116 | return 0; |
117 | ||
118 | rtattr_failure: | |
119 | return -EMSGSIZE; | |
120 | } | |
121 | ||
45a96b9b PE |
122 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, |
123 | u32 pid, u32 seq, u32 flags, int sk_ino) | |
124 | { | |
125 | unsigned char *b = skb_tail_pointer(skb); | |
126 | struct nlmsghdr *nlh; | |
127 | struct unix_diag_msg *rep; | |
128 | ||
129 | nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep)); | |
130 | nlh->nlmsg_flags = flags; | |
131 | ||
132 | rep = NLMSG_DATA(nlh); | |
133 | ||
134 | rep->udiag_family = AF_UNIX; | |
135 | rep->udiag_type = sk->sk_type; | |
136 | rep->udiag_state = sk->sk_state; | |
137 | rep->udiag_ino = sk_ino; | |
138 | sock_diag_save_cookie(sk, rep->udiag_cookie); | |
139 | ||
f5248b48 | 140 | if ((req->udiag_show & UDIAG_SHOW_NAME) && |
257b5298 | 141 | sk_diag_dump_name(sk, skb)) |
f5248b48 PE |
142 | goto nlmsg_failure; |
143 | ||
5f7b0569 | 144 | if ((req->udiag_show & UDIAG_SHOW_VFS) && |
257b5298 | 145 | sk_diag_dump_vfs(sk, skb)) |
5f7b0569 PE |
146 | goto nlmsg_failure; |
147 | ||
ac02be8d | 148 | if ((req->udiag_show & UDIAG_SHOW_PEER) && |
257b5298 | 149 | sk_diag_dump_peer(sk, skb)) |
ac02be8d PE |
150 | goto nlmsg_failure; |
151 | ||
2aac7a2c | 152 | if ((req->udiag_show & UDIAG_SHOW_ICONS) && |
257b5298 | 153 | sk_diag_dump_icons(sk, skb)) |
2aac7a2c PE |
154 | goto nlmsg_failure; |
155 | ||
cbf39195 | 156 | if ((req->udiag_show & UDIAG_SHOW_RQLEN) && |
257b5298 PE |
157 | sk_diag_show_rqlen(sk, skb)) |
158 | goto nlmsg_failure; | |
159 | ||
160 | if ((req->udiag_show & UDIAG_SHOW_MEMINFO) && | |
161 | sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO)) | |
cbf39195 PE |
162 | goto nlmsg_failure; |
163 | ||
45a96b9b PE |
164 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
165 | return skb->len; | |
166 | ||
167 | nlmsg_failure: | |
168 | nlmsg_trim(skb, b); | |
169 | return -EMSGSIZE; | |
170 | } | |
171 | ||
172 | static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, | |
173 | u32 pid, u32 seq, u32 flags) | |
174 | { | |
175 | int sk_ino; | |
176 | ||
177 | unix_state_lock(sk); | |
178 | sk_ino = sock_i_ino(sk); | |
179 | unix_state_unlock(sk); | |
180 | ||
181 | if (!sk_ino) | |
182 | return 0; | |
183 | ||
184 | return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino); | |
185 | } | |
186 | ||
22931d3b PE |
187 | static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
188 | { | |
45a96b9b PE |
189 | struct unix_diag_req *req; |
190 | int num, s_num, slot, s_slot; | |
191 | ||
192 | req = NLMSG_DATA(cb->nlh); | |
193 | ||
194 | s_slot = cb->args[0]; | |
195 | num = s_num = cb->args[1]; | |
196 | ||
197 | spin_lock(&unix_table_lock); | |
198 | for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) { | |
199 | struct sock *sk; | |
200 | struct hlist_node *node; | |
201 | ||
202 | num = 0; | |
203 | sk_for_each(sk, node, &unix_socket_table[slot]) { | |
204 | if (num < s_num) | |
205 | goto next; | |
206 | if (!(req->udiag_states & (1 << sk->sk_state))) | |
207 | goto next; | |
208 | if (sk_diag_dump(sk, skb, req, | |
257b5298 PE |
209 | NETLINK_CB(cb->skb).pid, |
210 | cb->nlh->nlmsg_seq, | |
211 | NLM_F_MULTI) < 0) | |
45a96b9b PE |
212 | goto done; |
213 | next: | |
214 | num++; | |
215 | } | |
216 | } | |
217 | done: | |
218 | spin_unlock(&unix_table_lock); | |
219 | cb->args[0] = slot; | |
220 | cb->args[1] = num; | |
221 | ||
222 | return skb->len; | |
22931d3b PE |
223 | } |
224 | ||
5d3cae8b PE |
225 | static struct sock *unix_lookup_by_ino(int ino) |
226 | { | |
227 | int i; | |
228 | struct sock *sk; | |
229 | ||
230 | spin_lock(&unix_table_lock); | |
231 | for (i = 0; i <= UNIX_HASH_SIZE; i++) { | |
232 | struct hlist_node *node; | |
233 | ||
234 | sk_for_each(sk, node, &unix_socket_table[i]) | |
235 | if (ino == sock_i_ino(sk)) { | |
236 | sock_hold(sk); | |
237 | spin_unlock(&unix_table_lock); | |
238 | ||
239 | return sk; | |
240 | } | |
241 | } | |
242 | ||
243 | spin_unlock(&unix_table_lock); | |
244 | return NULL; | |
245 | } | |
246 | ||
22931d3b PE |
247 | static int unix_diag_get_exact(struct sk_buff *in_skb, |
248 | const struct nlmsghdr *nlh, | |
249 | struct unix_diag_req *req) | |
250 | { | |
5d3cae8b PE |
251 | int err = -EINVAL; |
252 | struct sock *sk; | |
253 | struct sk_buff *rep; | |
254 | unsigned int extra_len; | |
255 | ||
256 | if (req->udiag_ino == 0) | |
257 | goto out_nosk; | |
258 | ||
259 | sk = unix_lookup_by_ino(req->udiag_ino); | |
260 | err = -ENOENT; | |
261 | if (sk == NULL) | |
262 | goto out_nosk; | |
263 | ||
264 | err = sock_diag_check_cookie(sk, req->udiag_cookie); | |
265 | if (err) | |
266 | goto out; | |
267 | ||
268 | extra_len = 256; | |
269 | again: | |
270 | err = -ENOMEM; | |
271 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct unix_diag_msg) + extra_len)), | |
272 | GFP_KERNEL); | |
273 | if (!rep) | |
274 | goto out; | |
275 | ||
276 | err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid, | |
277 | nlh->nlmsg_seq, 0, req->udiag_ino); | |
278 | if (err < 0) { | |
279 | kfree_skb(rep); | |
280 | extra_len += 256; | |
281 | if (extra_len >= PAGE_SIZE) | |
282 | goto out; | |
283 | ||
284 | goto again; | |
285 | } | |
286 | err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, | |
287 | MSG_DONTWAIT); | |
288 | if (err > 0) | |
289 | err = 0; | |
290 | out: | |
291 | if (sk) | |
292 | sock_put(sk); | |
293 | out_nosk: | |
294 | return err; | |
22931d3b PE |
295 | } |
296 | ||
297 | static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
298 | { | |
299 | int hdrlen = sizeof(struct unix_diag_req); | |
300 | ||
301 | if (nlmsg_len(h) < hdrlen) | |
302 | return -EINVAL; | |
303 | ||
304 | if (h->nlmsg_flags & NLM_F_DUMP) | |
305 | return netlink_dump_start(sock_diag_nlsk, skb, h, | |
306 | unix_diag_dump, NULL, 0); | |
307 | else | |
308 | return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h)); | |
309 | } | |
310 | ||
311 | static struct sock_diag_handler unix_diag_handler = { | |
312 | .family = AF_UNIX, | |
313 | .dump = unix_diag_handler_dump, | |
314 | }; | |
315 | ||
316 | static int __init unix_diag_init(void) | |
317 | { | |
318 | return sock_diag_register(&unix_diag_handler); | |
319 | } | |
320 | ||
321 | static void __exit unix_diag_exit(void) | |
322 | { | |
323 | sock_diag_unregister(&unix_diag_handler); | |
324 | } | |
325 | ||
326 | module_init(unix_diag_init); | |
327 | module_exit(unix_diag_exit); | |
328 | MODULE_LICENSE("GPL"); | |
329 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */); |