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